:root{--black:#020100;--blue:#0B3289;--yellow:#F6CB1D;--text:#F6CB1D;--soft:#D8E2FF;--muted:#8DA4DF;--line:rgba(11,50,137,.75);--glass:rgba(11,50,137,.16)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--black);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{text-decoration:none;color:inherit}.bg{position:fixed;inset:0;pointer-events:none;background:radial-gradient(circle at 12% 8%,rgba(11,50,137,.28),transparent 28%),radial-gradient(circle at 88% 14%,rgba(246,203,29,.09),transparent 22%),radial-gradient(circle at 70% 88%,rgba(11,50,137,.20),transparent 34%);z-index:0}.app{position:relative;z-index:1}.top{position:sticky;top:0;z-index:10;background:rgba(2,1,0,.86);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.nav{height:72px;max-width:1500px;margin:auto;padding:0 34px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:14px;font-weight:1000}.logo{width:44px;height:44px;border-radius:15px;background:var(--blue);color:var(--yellow);display:grid;place-items:center;box-shadow:0 0 24px rgba(11,50,137,.7)}.navlinks{display:flex;gap:10px;flex-wrap:wrap}.navlinks a{border:1px solid var(--blue);border-radius:999px;color:var(--yellow);padding:9px 13px;font-size:13px}.navlinks a:hover,.navlinks a.on{background:var(--blue)}.wrap{max-width:1500px;margin:auto;padding:34px}.hero{display:grid;grid-template-columns:1.08fr .92fr;gap:26px;align-items:stretch}.hero-card,.panel,.card{border:2px solid var(--blue);background:rgba(2,1,0,.92);border-radius:42px;box-shadow:0 0 42px rgba(11,50,137,.20);overflow:hidden}.hero-card{padding:48px;min-height:420px;position:relative}.hero-card:after{content:"";position:absolute;right:-110px;bottom:-110px;width:320px;height:320px;border-radius:50%;border:2px solid var(--blue);box-shadow:0 0 42px rgba(11,50,137,.5)}.kicker{display:inline-flex;border:1px solid var(--blue);border-radius:14px;color:var(--yellow);padding:10px 15px;font-weight:900}.hero h1{font-size:66px;line-height:1.04;margin:26px 0;color:var(--yellow);letter-spacing:-2px}.hero p,.sub{color:var(--soft);line-height:1.85}.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}.btn{border:0;border-radius:18px;padding:14px 19px;font-weight:1000;cursor:pointer;display:inline-flex;align-items:center;gap:8px}.btn.yellow{background:var(--yellow);color:var(--black)}.btn.blue{background:var(--blue);color:var(--yellow)}.btn.ghost{background:transparent;color:var(--yellow);border:1px solid var(--blue)}.mini{padding:24px}.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.metric{background:var(--glass);border:1px solid var(--line);border-radius:24px;padding:20px}.metric b{font-size:34px}.section-title{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:44px 0 18px}h2{margin:0;color:var(--yellow);font-size:36px;letter-spacing:-1px}h3{margin:0 0 10px;color:var(--yellow);font-size:24px}.badge{display:inline-flex;background:var(--yellow);color:var(--black);border-radius:999px;padding:7px 11px;font-size:12px;font-weight:1000}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:22px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card{padding:24px}.screen-list{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.screen-link{min-height:126px;border:1px solid var(--blue);border-radius:26px;padding:18px;background:var(--glass);transition:.2s}.screen-link:hover{transform:translateY(-4px);background:var(--blue)}.screen-link b{display:block;margin-bottom:10px}.layout{display:grid;grid-template-columns:260px 1fr;gap:0;min-height:620px}.sidebar{background:var(--blue);padding:24px;border-radius:40px 60px 60px 40px}.sideitem{display:block;padding:14px 16px;margin-bottom:10px;border-radius:18px;color:var(--yellow);font-weight:900}.sideitem.on,.sideitem:hover{background:var(--yellow);color:var(--black)}.main{padding:24px}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.input,.select{height:48px;border:2px solid var(--blue);border-radius:16px;padding:0 14px;color:var(--yellow);background:var(--black);display:flex;align-items:center}.table{border:1px solid var(--line);border-radius:24px;overflow:hidden}.tr{display:grid;grid-template-columns:1.2fr 1fr 1fr .8fr .9fr;gap:12px;padding:15px 18px;border-bottom:1px solid rgba(11,50,137,.45);color:var(--soft);font-size:14px}.tr.head{background:var(--glass);color:var(--yellow);font-weight:1000}.course-card{background:var(--glass);border:1px solid var(--line);border-radius:30px;padding:20px}.cover{height:150px;border-radius:30px;background:var(--blue);padding:20px;display:flex;flex-direction:column;justify-content:end;margin-bottom:16px}.progress{height:10px;border-radius:999px;background:rgba(246,203,29,.18);overflow:hidden}.progress i{display:block;height:100%;background:var(--yellow);border-radius:999px}.lesson{display:flex;justify-content:space-between;align-items:center;gap:12px;background:rgba(11,50,137,.20);border:1px solid var(--line);border-radius:20px;padding:14px 16px;margin-bottom:10px;color:var(--soft)}.lesson strong{color:var(--yellow)}.icon{width:32px;height:32px;border-radius:12px;background:var(--yellow);color:var(--black);display:inline-grid;place-items:center;margin-right:10px}.player{height:380px;border:2px solid var(--blue);border-radius:34px;background:#000;display:grid;place-items:center;position:relative;overflow:hidden}.watermark{position:absolute;inset:0;opacity:.16;background-image:repeating-linear-gradient(-30deg,transparent 0 70px,var(--yellow) 71px 72px,transparent 73px 140px)}.play{width:82px;height:82px;border-radius:50%;background:var(--yellow);color:var(--black);display:grid;place-items:center;font-size:32px;font-weight:1000}.pdf-page{height:460px;border:2px dashed var(--blue);border-radius:30px;background:rgba(255,255,255,.025);padding:34px;position:relative;overflow:hidden}.pdf-page:before{content:"账号 138****8899 · 学海无涯_7f8a";position:absolute;left:70px;top:200px;transform:rotate(-18deg);font-size:34px;color:var(--yellow);opacity:.15;font-weight:1000}.modal{max-width:560px;margin:40px auto;border:2px solid var(--blue);border-radius:36px;padding:32px;background:var(--black);box-shadow:0 0 50px rgba(11,50,137,.32)}.form{display:grid;gap:14px}.pill{border:1px solid var(--blue);border-radius:999px;padding:7px 10px;color:var(--yellow);font-size:12px}.outline-box{border:1px dashed var(--blue);border-radius:24px;padding:18px;color:var(--soft)}@media(max-width:1050px){.hero,.grid-2,.layout{grid-template-columns:1fr}.grid-3,.grid-4,.screen-list{grid-template-columns:1fr 1fr}.hero h1{font-size:42px}.navlinks{display:none}.wrap{padding:20px}.tr{grid-template-columns:1fr}.sidebar{border-radius:30px}}@media(max-width:620px){.grid-3,.grid-4,.screen-list{grid-template-columns:1fr}}
/* High fidelity admin console */
.admin-shell{min-height:100vh;display:grid;grid-template-columns:292px 1fr;background:var(--black)}.admin-sidebar{position:sticky;top:0;height:100vh;border-right:2px solid var(--blue);background:linear-gradient(180deg,rgba(11,50,137,.46),rgba(2,1,0,.98) 42%);padding:24px 18px;overflow:auto}.admin-logo{display:flex;gap:12px;align-items:center;margin-bottom:26px;padding:0 6px}.admin-logo-mark{width:48px;height:48px;border-radius:16px;background:var(--yellow);color:var(--black);display:grid;place-items:center;font-weight:1000}.admin-logo b{font-size:18px}.admin-group{margin:18px 0}.admin-group-title{color:var(--muted);font-size:12px;font-weight:900;padding:0 12px 8px;letter-spacing:.08em}.admin-menu a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 14px;border-radius:18px;color:var(--soft);margin-bottom:7px;border:1px solid transparent;font-weight:800}.admin-menu a:hover,.admin-menu a.on{background:var(--yellow);color:var(--black)}.admin-menu small{opacity:.78}.admin-content{min-width:0}.admin-header{position:sticky;top:0;z-index:5;min-height:76px;background:rgba(2,1,0,.88);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:14px 30px;gap:18px}.admin-title b{font-size:20px}.admin-search{width:360px;height:44px;border:1px solid var(--blue);border-radius:999px;display:flex;align-items:center;color:var(--muted);padding:0 16px;background:rgba(0,0,0,.35)}.admin-user{display:flex;align-items:center;gap:12px}.avatar{width:42px;height:42px;border-radius:50%;background:var(--blue);display:grid;place-items:center;color:var(--yellow);font-weight:1000}.admin-main{padding:28px 30px 60px}.module{padding-top:28px}.module-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:10px 0 16px}.dash-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}.big-card{border:2px solid var(--blue);border-radius:34px;background:linear-gradient(135deg,rgba(11,50,137,.92),rgba(2,1,0,.95));padding:28px;min-height:230px;position:relative;overflow:hidden}.big-card:after{content:"";position:absolute;right:-80px;bottom:-90px;width:260px;height:260px;border-radius:50%;border:2px solid rgba(246,203,29,.25)}.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}.stat-tile{border:1px solid var(--line);background:rgba(2,1,0,.5);border-radius:24px;padding:18px}.stat-tile b{display:block;font-size:32px}.chart-card{border:2px solid var(--blue);border-radius:34px;padding:24px;background:rgba(2,1,0,.94)}.bars{height:150px;display:flex;gap:12px;align-items:end;margin-top:20px}.bar{flex:1;border-radius:12px 12px 4px 4px;background:linear-gradient(180deg,var(--yellow),#9b7d07);min-height:24px}.tabs{display:flex;gap:8px;flex-wrap:wrap}.tab{padding:9px 12px;border:1px solid var(--blue);border-radius:999px;color:var(--yellow);font-size:13px}.tab.on{background:var(--yellow);color:var(--black)}.data-table{border:1px solid var(--line);border-radius:26px;overflow:hidden;background:rgba(2,1,0,.72)}.data-table .row{display:grid;grid-template-columns:1.2fr 1fr 1fr .9fr 1fr;gap:12px;padding:15px 18px;border-bottom:1px solid rgba(11,50,137,.45);color:var(--soft);font-size:14px;align-items:center}.data-table .row.head{background:var(--glass);color:var(--yellow);font-weight:1000}.badge.blue{background:var(--blue);color:var(--yellow);border:1px solid rgba(246,203,29,.2)}.badge.green{background:rgba(70,209,125,.18);color:#8cffb6;border:1px solid rgba(70,209,125,.5)}.badge.red{background:rgba(255,92,92,.18);color:#ffadad;border:1px solid rgba(255,92,92,.5)}.btn.danger{background:rgba(255,92,92,.16);color:#ff9a9a;border:1px solid rgba(255,92,92,.6)}.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:18px}.permission-grid{display:grid;grid-template-columns:260px 1fr;gap:18px}.level-list{display:grid;gap:12px}.level-item{border:1px solid var(--blue);border-radius:22px;padding:16px;background:rgba(11,50,137,.13)}.level-item.on{background:var(--blue)}.check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.check-card{border:1px solid var(--line);border-radius:20px;padding:14px;background:rgba(11,50,137,.12);color:var(--soft)}.check-card b{color:var(--yellow)}.outline-editor{display:grid;grid-template-columns:1fr 360px;gap:18px}.chapter{border:1px solid var(--line);border-radius:26px;padding:18px;margin-bottom:14px;background:rgba(11,50,137,.10)}.chapter-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.lesson-row{display:grid;grid-template-columns:42px 1fr 90px 90px;gap:10px;align-items:center;padding:12px;border:1px solid rgba(11,50,137,.55);border-radius:18px;margin-bottom:10px;color:var(--soft);background:rgba(2,1,0,.45)}.drag{width:32px;height:32px;border-radius:10px;background:var(--blue);display:grid;place-items:center;color:var(--yellow)}.textarea{min-height:110px;padding:14px;border:2px solid var(--blue);border-radius:16px;color:var(--yellow);background:var(--black)}.settings-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.setting-card{border:1px solid var(--line);border-radius:26px;padding:20px;background:rgba(11,50,137,.10)}.switch{width:52px;height:28px;border-radius:999px;background:var(--blue);position:relative;box-shadow:inset 0 0 0 1px rgba(246,203,29,.25)}.switch:after{content:"";position:absolute;width:22px;height:22px;border-radius:50%;background:var(--yellow);right:3px;top:3px}.config-line{display:grid;grid-template-columns:160px 1fr;gap:12px;margin-bottom:12px;align-items:center}.device-card{display:flex;justify-content:space-between;align-items:center;border:1px solid var(--line);border-radius:20px;padding:15px;margin-bottom:10px;color:var(--soft);background:rgba(2,1,0,.42)}@media(max-width:1180px){.admin-shell{grid-template-columns:1fr}.admin-sidebar{position:relative;height:auto}.dash-hero,.split,.permission-grid,.outline-editor{grid-template-columns:1fr}.stat-row,.settings-grid{grid-template-columns:repeat(2,1fr)}.admin-search{display:none}}@media(max-width:760px){.stat-row,.check-grid,.settings-grid{grid-template-columns:1fr}.data-table .row,.lesson-row{grid-template-columns:1fr}.admin-header{align-items:flex-start;flex-direction:column}.module-head{align-items:flex-start;flex-direction:column}}
.pdf-page:before{content:"账号 138****8899 · 学海无涯_7f8a" !important}
/* High fidelity learner app */
.learner-shell{min-height:100vh;background:var(--black)}.learner-top{position:sticky;top:0;z-index:9;height:76px;background:rgba(2,1,0,.9);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 30px}.learner-brand{display:flex;align-items:center;gap:12px;font-weight:1000}.learner-main{max-width:1480px;margin:auto;padding:28px 30px 70px}.learner-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}.identity-card{border:2px solid var(--blue);border-radius:34px;background:linear-gradient(135deg,rgba(11,50,137,.88),rgba(2,1,0,.96));padding:28px;min-height:230px;position:relative;overflow:hidden}.identity-card:after{content:"";position:absolute;right:-70px;bottom:-80px;width:260px;height:260px;border:2px solid rgba(246,203,29,.22);border-radius:50%}.learner-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.mini-stat{border:1px solid var(--line);border-radius:24px;background:rgba(2,1,0,.55);padding:18px}.mini-stat b{font-size:30px}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.learn-course{border:1px solid var(--line);border-radius:32px;background:rgba(11,50,137,.12);padding:20px;cursor:pointer;transition:.2s}.learn-course:hover,.learn-course.active{transform:translateY(-4px);border-color:var(--yellow);box-shadow:0 0 28px rgba(246,203,29,.12)}.learn-cover{height:150px;border-radius:28px;background:linear-gradient(135deg,var(--blue),#071746);padding:20px;display:flex;flex-direction:column;justify-content:end;margin-bottom:16px}.locked{opacity:.55;filter:saturate(.6)}.learning-workspace{display:grid;grid-template-columns:350px 1fr;gap:18px}.lesson-panel,.viewer-panel{border:2px solid var(--blue);border-radius:34px;background:rgba(2,1,0,.94);padding:20px}.lesson-tabs{display:flex;gap:8px;margin-bottom:14px}.lesson-tabs button{border:1px solid var(--blue);background:transparent;color:var(--yellow);border-radius:999px;padding:9px 12px;font-weight:900}.lesson-tabs button.on{background:var(--yellow);color:var(--black)}.learn-lesson{display:grid;grid-template-columns:38px 1fr auto;gap:10px;align-items:center;border:1px solid rgba(11,50,137,.65);border-radius:20px;padding:12px;margin-bottom:10px;color:var(--soft);cursor:pointer;background:rgba(11,50,137,.12)}.learn-lesson:hover,.learn-lesson.active{border-color:var(--yellow);background:rgba(246,203,29,.08)}.learn-lesson.done .status{color:#8cffb6}.lesson-type{width:34px;height:34px;border-radius:12px;background:var(--yellow);color:var(--black);display:grid;place-items:center}.status{font-size:12px;color:var(--muted)}.viewer-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}.video-box{height:430px;border:2px solid var(--blue);border-radius:32px;background:#000;display:grid;place-items:center;position:relative;overflow:hidden}.video-box:before{content:"账号 138****8899 · 学海无涯_7f8a";position:absolute;left:36px;top:24px;color:var(--yellow);opacity:.18;font-weight:1000}.video-control{position:absolute;left:24px;right:24px;bottom:22px}.control-row{display:flex;align-items:center;justify-content:space-between;margin-top:12px;color:var(--soft)}.round-play{width:78px;height:78px;border-radius:50%;background:var(--yellow);color:var(--black);display:grid;place-items:center;font-size:30px;font-weight:1000}.pdf-reader{height:430px;border:2px dashed var(--blue);border-radius:32px;background:rgba(255,255,255,.025);padding:30px;position:relative;overflow:hidden}.pdf-reader:before{content:"账号 138****8899 · 学海无涯_7f8a";position:absolute;left:80px;top:190px;transform:rotate(-18deg);font-size:34px;color:var(--yellow);opacity:.14;font-weight:1000}.pdf-page-card{height:100%;border-radius:22px;background:rgba(11,50,137,.16);padding:28px}.reader-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:16px}.profile-drawer{display:grid;grid-template-columns:1fr 1fr;gap:18px}.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,.72);z-index:99;display:none;align-items:center;justify-content:center;padding:20px}.modal-mask.show{display:flex}.app-modal{width:min(560px,100%);border:2px solid var(--blue);border-radius:34px;background:var(--black);padding:28px;box-shadow:0 0 60px rgba(11,50,137,.42)}.toast{position:fixed;right:24px;bottom:24px;z-index:120;background:var(--yellow);color:var(--black);border-radius:18px;padding:14px 18px;font-weight:1000;display:none}.toast.show{display:block}.login-screen{min-height:calc(100vh - 76px);display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center;max-width:1200px;margin:auto;padding:40px 24px}.login-visual{min-height:460px;border-radius:54px;background:var(--blue);padding:46px;display:flex;flex-direction:column;justify-content:center}.login-form-hi{border:2px solid var(--blue);border-radius:40px;padding:38px;background:rgba(2,1,0,.94)}@media(max-width:1050px){.learner-hero,.learning-workspace,.login-screen,.profile-drawer{grid-template-columns:1fr}.course-grid,.learner-stats{grid-template-columns:1fr}.learner-top{height:auto;padding:16px;align-items:flex-start;gap:14px;flex-direction:column}.video-box,.pdf-reader{height:340px}}

/* 会员级别授权：双栏穿梭框 */
.transfer-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:18px}
.course-transfer{display:grid;grid-template-columns:minmax(0,1fr) 190px minmax(0,1fr);gap:16px;align-items:stretch}
.course-transfer.disabled{opacity:.55;pointer-events:none}
.transfer-panel{border:1px solid var(--line);border-radius:26px;background:rgba(11,50,137,.10);padding:16px;min-width:0;display:flex;flex-direction:column;min-height:540px}
.transfer-panel.authorized{border-color:rgba(246,203,29,.45);background:rgba(246,203,29,.055)}
.transfer-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;color:var(--yellow)}
.transfer-search{height:44px;margin-bottom:12px;border-width:1px;background:rgba(2,1,0,.55)}
.transfer-search input{all:unset;width:100%;color:var(--yellow)}
.transfer-search input::placeholder{color:var(--muted)}
.transfer-list{display:grid;gap:10px;overflow:auto;max-height:430px;padding-right:4px}
.transfer-course{display:grid;grid-template-columns:22px 1fr;gap:10px;align-items:flex-start;border:1px solid rgba(11,50,137,.62);border-radius:18px;padding:12px;background:rgba(2,1,0,.36);color:var(--soft);cursor:pointer;transition:.16s}
.transfer-course:hover{border-color:var(--yellow);background:rgba(246,203,29,.06)}
.transfer-course input{margin-top:3px;accent-color:#f6cb1d}
.transfer-course b{display:block;color:var(--yellow);line-height:1.35;margin-bottom:4px}
.transfer-course small{display:block;color:var(--muted);line-height:1.55}
.transfer-actions{display:flex;flex-direction:column;justify-content:center;gap:12px;min-width:0}
.transfer-actions .btn{justify-content:center;width:100%;padding:12px 10px;border-radius:16px;text-align:center}
.empty-state{border:1px dashed rgba(11,50,137,.7);border-radius:18px;padding:22px;text-align:center;color:var(--muted);line-height:1.7;background:rgba(2,1,0,.25)}
@media(max-width:1180px){.course-transfer{grid-template-columns:1fr}.transfer-actions{display:grid;grid-template-columns:1fr 1fr}.transfer-panel{min-height:360px}.transfer-list{max-height:300px}}
@media(max-width:760px){.transfer-head{flex-direction:column}.transfer-actions{grid-template-columns:1fr}}

/* 会员级别列表页 */
.level-search{width:min(520px,100%)}
.level-search input{all:unset;width:100%;color:var(--yellow)}
.level-search input::placeholder{color:var(--muted)}
.level-table .level-row{grid-template-columns:1.1fr 1fr 1.4fr .55fr 1fr}
.level-table .row b{color:var(--yellow)}
.row-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.row-actions .btn{padding:9px 12px;border-radius:14px}
.level-editor-mask{align-items:flex-start;overflow:auto}
.level-editor-modal{width:min(1180px,100%);margin:24px auto}
.editor-transfer .transfer-panel{min-height:480px}
.editor-transfer .transfer-list{max-height:370px}
@media(max-width:1000px){.level-table .level-row{grid-template-columns:1fr}.level-editor-modal{margin:0}.editor-transfer .transfer-panel{min-height:340px}}

/* 课程管理：列表 + 面包屑编辑视图 */
.breadcrumb{display:flex;align-items:center;gap:9px;margin:0 0 18px;color:var(--soft);font-weight:900}
.breadcrumb a{color:var(--yellow);cursor:pointer}.breadcrumb span{color:var(--muted)}.breadcrumb b{color:var(--yellow)}
.course-search{width:min(520px,100%)}.course-search input{all:unset;width:100%;color:var(--yellow)}.course-search input::placeholder{color:var(--muted)}
.course-list-table .course-row{grid-template-columns:1.35fr .75fr .65fr 1.1fr .9fr 1fr}.course-list-table .row b{color:var(--yellow)}
.course-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:grid;gap:8px}.field label{color:var(--soft);font-weight:900}.field input,.field select,.field textarea{width:100%;border:1px solid var(--blue);border-radius:15px;background:#05070d;color:var(--yellow);padding:13px 14px;outline:none}.field textarea{min-height:92px;resize:vertical}.modal-wide{width:min(760px,100%)}
.course-edit-card,.course-content-card{border-radius:30px}.outline-tree{display:grid;gap:14px}.chapter-box{border:1px solid var(--line);border-radius:26px;background:rgba(11,50,137,.10);overflow:hidden}.chapter-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;background:rgba(11,50,137,.22);border-bottom:1px solid rgba(11,50,137,.45)}.chapter-lessons{padding:14px;display:grid;gap:10px}.lesson-line{display:grid;grid-template-columns:42px 1fr auto;gap:12px;align-items:center;border:1px solid rgba(11,50,137,.55);border-radius:18px;background:rgba(2,1,0,.42);padding:12px}.lesson-icon{width:36px;height:36px;border-radius:13px;background:var(--yellow);color:var(--black);display:grid;place-items:center;font-weight:1000;font-size:12px}
@media(max-width:1000px){.course-list-table .course-row,.course-form-grid,.lesson-line{grid-template-columns:1fr}.chapter-head{align-items:flex-start;flex-direction:column}}

/* 课程分类管理 */
.category-table .category-row{grid-template-columns:1.4fr .55fr .55fr .75fr 1fr}
@media(max-width:900px){.category-table .category-row{grid-template-columns:1fr}}

/* 课程内容：无限层级树形大纲 */
.tree-outline{display:grid;gap:10px}.tree-node{margin-left:calc(var(--depth) * 28px)}.tree-node-main{display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid rgba(11,50,137,.55);border-radius:18px;background:rgba(2,1,0,.42);padding:12px}.chapter-node>.tree-node-main{background:rgba(11,50,137,.16);border-color:rgba(246,203,29,.28)}.tree-node-title{display:flex;align-items:center;gap:12px;min-width:0}.tree-node-title b{color:var(--yellow)}.tree-children{display:grid;gap:10px;margin-top:10px}.tree-node .row-actions .btn{padding:8px 10px;border-radius:12px}.chapter-node{position:relative}.chapter-node:before{content:"";position:absolute;left:-14px;top:0;bottom:0;border-left:1px dashed rgba(11,50,137,.65)}
@media(max-width:760px){.tree-node{margin-left:calc(var(--depth) * 12px)}.tree-node-main{align-items:flex-start;flex-direction:column}.chapter-node:before{display:none}}

.modal-mask{overflow:auto;align-items:flex-start!important}
.app-modal{max-height:calc(100vh - 40px);overflow:auto}
.modal-wide{max-height:calc(100vh - 40px);overflow:auto}

/* 学员端播放器/PDF 预览尺寸优化：避免视频和 PDF 被外层容器裁切 */
.learning-workspace{align-items:start}
.viewer-panel{overflow:visible}
.viewer-panel #videoView,
.viewer-panel #pdfView{width:100%}
.video-box,
.pdf-reader{width:100%;height:clamp(560px,72vh,820px)}
.pdf-reader{padding:0;border-style:solid;background:#202428}
.pdf-reader:before{display:none}
.pdf-page-card{height:100%;padding:0;background:#202428}
#studentPdfFrame{display:block;width:100%;height:100%}
#aliyunPlayer{width:100%;height:100%}
@media(max-width:1050px){.video-box,.pdf-reader{height:clamp(420px,64vh,680px)}}

/* 学员端详情页布局优化：限制各模块边界，避免内容抢占空间 */
.student-breadcrumb{margin-top:4px;margin-bottom:18px;max-width:100%;overflow:hidden;white-space:nowrap}
.student-breadcrumb a,.student-breadcrumb b{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#courseDetail .section-title{align-items:flex-start;margin-top:0}
#courseDetail .section-title>div{min-width:0;flex:1}
#courseTitle,#lessonTitle{overflow-wrap:anywhere}
#courseDesc,#lessonDescText,#lessonMeta{max-width:100%;overflow-wrap:anywhere}
#courseProgress{flex:0 0 auto;margin-top:8px}
.learning-workspace{grid-template-columns:minmax(280px,350px) minmax(0,1fr);gap:20px;align-items:start;width:100%}
.lesson-panel,.viewer-panel{min-width:0;max-width:100%;overflow:hidden}
.lesson-panel{position:sticky;top:96px;max-height:calc(100vh - 124px);display:flex;flex-direction:column}
.lesson-tabs{flex:0 0 auto}
#lessonList{min-height:0;overflow:auto;padding-right:4px}
.learn-lesson{grid-template-columns:38px minmax(0,1fr) auto;min-width:0}
.learn-lesson span{min-width:0}.learn-lesson b,.learn-lesson small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.learn-lesson .status{white-space:nowrap}
.viewer-head{align-items:flex-start;margin-bottom:18px;padding-bottom:16px;border-bottom:1px solid rgba(11,50,137,.45)}
.viewer-head>div{min-width:0;width:100%}
.viewer-panel #videoView,.viewer-panel #pdfView{min-width:0;overflow:hidden;border-radius:32px}
.video-box,.pdf-reader{max-width:100%;height:clamp(520px,68vh,760px)}
#aliyunPlayer,.video-box iframe,.pdf-reader iframe{max-width:100%}
@media(max-width:1050px){
  .learning-workspace{grid-template-columns:1fr}
  .lesson-panel{position:relative;top:auto;max-height:none}
  #lessonList{max-height:360px}
  #courseDetail .section-title{flex-direction:column;align-items:flex-start}
  .video-box,.pdf-reader{height:clamp(420px,62vh,640px)}
}
@media(max-width:640px){
  .learner-main{padding:20px 16px 56px}
  .lesson-panel,.viewer-panel{border-radius:24px;padding:16px}
  .learn-lesson{grid-template-columns:34px minmax(0,1fr);gap:9px}
  .learn-lesson .status{grid-column:2;justify-self:start}
  .video-box,.pdf-reader{border-radius:24px;height:clamp(340px,58vh,560px)}
}

/* 用户端顶部导航优化：避免底部分隔线穿过右侧按钮 */
.learner-top{min-height:96px;height:auto;padding:14px 38px;border-bottom:0;position:sticky}
.learner-top:after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--line);pointer-events:none;z-index:0}
.learner-top .learner-brand,.learner-top .actions{position:relative;z-index:1}
.learner-top .actions{margin-top:0;align-items:center;gap:16px;flex-wrap:nowrap;background:rgba(2,1,0,.92);padding:0 0 0 18px}
.learner-top .btn{min-height:64px;padding:0 26px;border-radius:22px;line-height:1;white-space:nowrap}
.learner-top .btn.ghost{background:rgba(2,1,0,.96);border-color:rgba(11,50,137,.95)}
.learner-top .btn.blue{box-shadow:0 0 0 1px rgba(11,50,137,.8) inset}
@media(max-width:1050px){.learner-top{padding:16px;gap:16px}.learner-top .actions{padding-left:0;flex-wrap:wrap}.learner-top .btn{min-height:48px;padding:0 18px;border-radius:18px}}

/* 课程封面图：后台上传 + 用户端默认彩色封面 */
.course-cover-field{grid-column:1/-1}
.course-cover-editor{display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px;align-items:stretch}
.course-cover-preview{min-height:148px;border:1px solid var(--line);border-radius:24px;background:linear-gradient(135deg,var(--blue),#071746);background-size:cover;background-position:center;display:grid;place-items:center;color:var(--soft);font-weight:900;overflow:hidden}
.course-cover-preview span{padding:10px 14px;border-radius:999px;background:rgba(2,1,0,.55);border:1px solid rgba(246,203,29,.18)}
.course-cover-tools{display:flex;flex-wrap:wrap;gap:12px;align-content:center;align-items:center;min-width:0}
.course-cover-tools .sub{flex-basis:100%;margin:0}
.learn-cover{position:relative;overflow:hidden;background-size:cover;background-position:center;isolation:isolate}
.learn-cover:after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 82% 18%,rgba(246,203,29,.22),transparent 28%),linear-gradient(180deg,transparent,rgba(2,1,0,.22));z-index:-1}
.learn-cover.has-image:after{background:linear-gradient(180deg,rgba(2,1,0,.04),rgba(2,1,0,.62))}
.learn-cover h3{max-width:100%;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;text-shadow:0 2px 16px rgba(0,0,0,.55)}
.learn-cover.auto-cover h3{font-size:28px;line-height:1.15}
@media(max-width:760px){.course-cover-editor{grid-template-columns:1fr}.course-cover-preview{min-height:170px}.course-cover-tools .btn{width:100%;justify-content:center}}

/* 用户端课程卡片改版：参考“上封面、下简介”结构，无按钮 */
.course-grid{align-items:start}
.learn-course{padding:0;overflow:hidden;background:#f7f9ff;border:0;border-radius:28px;box-shadow:0 18px 42px rgba(11,50,137,.22);color:#17213a;display:flex;flex-direction:column}
.learn-course:hover,.learn-course.active{transform:translateY(-5px);box-shadow:0 22px 54px rgba(11,50,137,.34);border-color:transparent}
.learn-cover{height:auto;aspect-ratio:16/8.4;margin:12px 12px 0;border-radius:22px;display:flex;align-items:center;justify-content:center;padding:22px;background-size:cover;background-position:center}
.learn-cover:after{background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(0,0,0,.16))}
.learn-cover.has-image:after{background:linear-gradient(180deg,rgba(0,0,0,.03),rgba(0,0,0,.18))}
.learn-cover h3{margin:0;max-width:78%;padding:14px 18px;border-radius:10px;background:rgba(255,255,255,.92);color:#17213a;text-align:center;font-size:28px;line-height:1.12;font-weight:1000;text-shadow:none;box-shadow:0 10px 24px rgba(11,50,137,.12)}
.learn-cover.has-image h3{display:none}
.learn-cover.auto-cover h3{font-size:28px;color:#17213a}
.learn-course-body{padding:18px 22px 22px;background:#f7f9ff;display:flex;flex-direction:column;gap:10px;min-height:170px}
.learn-course-body h3{margin:0;color:#1f2b46;font-size:22px;line-height:1.25;text-align:center;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.course-summary{margin:0;color:#6d7485;font-size:15px;line-height:1.65;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:72px}
.course-card-meta{display:flex;justify-content:space-between;gap:12px;color:#36415c;font-weight:900;font-size:14px;margin-top:auto}
.learn-course .progress{height:10px;background:#e3e8f5;margin-top:0}.learn-course .progress i{background:linear-gradient(90deg,#2fb344,#f6cb1d)}
@media(max-width:760px){.learn-course-body{padding:16px 18px 20px}.learn-cover{margin:10px 10px 0;border-radius:20px}.learn-cover h3{font-size:22px}.learn-course-body h3{font-size:20px}}

/* 用户端课程卡片深色主题修正：与黑蓝黄背景统一 */
.learn-course{background:rgba(2,1,0,.94);border:1px solid rgba(11,50,137,.85);box-shadow:0 18px 44px rgba(11,50,137,.18);color:var(--soft)}
.learn-course:hover,.learn-course.active{border-color:var(--yellow);box-shadow:0 22px 56px rgba(11,50,137,.28),0 0 24px rgba(246,203,29,.10)}
.learn-course-body{background:linear-gradient(180deg,rgba(11,50,137,.10),rgba(2,1,0,.96));padding:20px 24px 24px;min-height:142px}
.learn-course-body h3{color:var(--yellow);text-align:left;font-size:24px}
.course-summary{color:var(--soft);min-height:0;-webkit-line-clamp:2}
.course-card-meta{color:var(--soft);font-size:15px}
.course-card-meta span:last-child{color:var(--yellow)}
.learn-course .progress{background:rgba(246,203,29,.16)}
.learn-course .progress i{background:var(--yellow)}
.learn-cover{box-shadow:inset 0 0 0 1px rgba(246,203,29,.08)}
.learn-cover h3{background:rgba(2,1,0,.78);color:var(--yellow);border:1px solid rgba(246,203,29,.22);box-shadow:0 12px 28px rgba(0,0,0,.28)}
.learn-cover.has-image:after{background:linear-gradient(180deg,rgba(2,1,0,.02),rgba(2,1,0,.44))}

/* 用户端课程浏览：Tab、搜索、分页、角色标识 */
.course-browser{margin:44px 0 18px}
.course-browser-head{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}
.course-tabs{display:inline-flex;gap:8px;padding:6px;border:1px solid rgba(11,50,137,.85);border-radius:999px;background:rgba(11,50,137,.14)}
.course-tabs button{border:0;border-radius:999px;background:transparent;color:var(--yellow);font-weight:1000;padding:12px 20px;cursor:pointer}
.course-tabs button.on{background:var(--yellow);color:var(--black);box-shadow:0 8px 20px rgba(246,203,29,.18)}
.course-searchbar{display:flex;align-items:center;gap:10px;min-width:min(520px,100%)}
.course-searchbar .input{flex:1;min-width:220px;background:rgba(2,1,0,.72)}
.course-pager{display:flex;align-items:center;justify-content:center;gap:14px;margin:22px 0 0;color:var(--soft);font-weight:900;flex-wrap:wrap}
.course-pager .btn[disabled]{opacity:.45;pointer-events:none}
.course-role-tags{position:absolute;right:18px;top:18px;z-index:3;display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;max-width:72%}
.course-role-tags span{display:inline-flex;align-items:center;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border-radius:999px;padding:6px 10px;background:rgba(246,203,29,.94);color:var(--black);font-size:12px;font-weight:1000;box-shadow:0 8px 18px rgba(0,0,0,.22)}
.learn-course{position:relative}
.learn-course.locked-course{opacity:.82;filter:saturate(.82)}
.learn-course.locked-course:hover{opacity:1;filter:saturate(1)}
.learn-course.locked-course .learn-cover:before{content:"";position:absolute;inset:0;background:rgba(2,1,0,.18);z-index:1;pointer-events:none}
@media(max-width:760px){.course-browser-head{align-items:stretch}.course-tabs,.course-searchbar{width:100%}.course-tabs{justify-content:center}.course-tabs button{flex:1}.course-searchbar{flex-direction:column;align-items:stretch}.course-searchbar .input{min-width:0}.course-role-tags{right:14px;top:14px;max-width:78%}}

/* 未上传封面图的默认封面优化：提升文字清晰度和背景层次 */
.learn-cover.auto-cover{background-size:180% 180%;background-position:center;position:relative;overflow:hidden}
.learn-cover.auto-cover:before{content:"";position:absolute;inset:-30%;background:radial-gradient(circle at 18% 22%,rgba(246,203,29,.32),transparent 24%),radial-gradient(circle at 86% 18%,rgba(216,226,255,.18),transparent 26%),radial-gradient(circle at 68% 84%,rgba(11,50,137,.46),transparent 30%);z-index:0;pointer-events:none}
.learn-cover.auto-cover:after{background:linear-gradient(135deg,rgba(2,1,0,.10),rgba(2,1,0,.34));z-index:0}
.learn-cover.auto-cover h3{position:relative;z-index:1;max-width:88%;background:transparent;border:0;box-shadow:none;color:var(--yellow);font-size:36px;line-height:1.12;letter-spacing:.02em;text-shadow:0 3px 12px rgba(0,0,0,.72),0 0 22px rgba(246,203,29,.26);padding:0;text-align:center}
.learn-cover.auto-cover h3:before{content:"";position:absolute;left:50%;top:50%;width:calc(100% + 44px);height:calc(100% + 28px);transform:translate(-50%,-50%);border-radius:22px;background:rgba(2,1,0,.28);border:1px solid rgba(246,203,29,.16);z-index:-1;backdrop-filter:blur(2px)}
@media(max-width:760px){.learn-cover.auto-cover h3{font-size:28px}.learn-cover.auto-cover h3:before{width:calc(100% + 30px)}}

/* 学员端课程目录层级树 */
.student-tree-chapter{margin-left:calc(var(--depth) * 16px);margin-bottom:10px}
.student-tree-chapter-title{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid rgba(246,203,29,.22);border-radius:18px;background:rgba(246,203,29,.06);color:var(--yellow)}
.student-tree-chapter-title b{font-size:15px;line-height:1.35;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.student-tree-children{display:grid;gap:10px;margin-top:10px}
.student-tree-lesson{margin-left:calc(var(--depth) * 16px)}
.student-tree-lesson:before{content:"";position:absolute;left:calc(18px + var(--depth) * -2px);top:-10px;height:10px;border-left:1px dashed rgba(11,50,137,.7)}
.learn-lesson{position:relative}
@media(max-width:760px){.student-tree-chapter,.student-tree-lesson{margin-left:calc(var(--depth) * 8px)}.student-tree-chapter-title{padding:10px 12px}}

/* 学员端目录课时项紧凑化：与章节项高度一致 */
.learn-lesson.compact-lesson{min-height:58px;padding:10px 14px;grid-template-columns:34px minmax(0,1fr) auto;align-items:center}
.learn-lesson.compact-lesson .lesson-type{width:30px;height:30px;border-radius:10px;font-size:16px}
.learn-lesson.compact-lesson b{display:block;line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.learn-lesson.compact-lesson .status{align-self:center;white-space:nowrap}
.student-tree-chapter-title{min-height:58px}
@media(max-width:640px){.learn-lesson.compact-lesson{grid-template-columns:32px minmax(0,1fr);min-height:54px}.learn-lesson.compact-lesson .status{grid-column:2;font-size:12px}}



/* 后台课程内容数字排序 */
.sort-control{display:inline-flex;align-items:center;gap:6px;color:var(--soft);font-size:12px;font-weight:900;border:1px solid rgba(11,50,137,.65);border-radius:14px;padding:7px 9px;background:rgba(2,1,0,.36)}
.sort-control input{width:58px;border:0;outline:none;background:transparent;color:var(--yellow);font-weight:1000;text-align:center}
.sort-control input::-webkit-outer-spin-button,.sort-control input::-webkit-inner-spin-button{opacity:1}

/* 领军商学学员端：参考雍邦咨询官网顶部 tab 与学习页视觉 */
body:has(.yb-learner-shell){
  --black:#0a0a0f;
  --blue:#6366f1;
  --yellow:#8b5cf6;
  --text:#ffffff;
  --soft:rgba(255,255,255,.72);
  --muted:rgba(255,255,255,.48);
  --line:rgba(255,255,255,.10);
  --glass:rgba(255,255,255,.04);
  background:#0a0a0f;
  color:#fff;
}
body:has(.yb-learner-shell) .bg{
  background:
    linear-gradient(180deg,rgba(20,22,42,.72),rgba(10,10,15,.98) 58%),
    radial-gradient(ellipse 88% 42% at 50% 0%,rgba(99,102,241,.16),transparent 64%),
    linear-gradient(120deg,rgba(6,182,212,.08),transparent 42%,rgba(139,92,246,.09));
}
.yb-learner-shell{position:relative;min-height:100vh;background:transparent;overflow:hidden}
.yb-learner-shell:before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px);
  background-size:72px 72px;mask-image:linear-gradient(180deg,rgba(0,0,0,.64),transparent 72%);
}
.yb-navbar{
  position:sticky;top:0;z-index:30;min-height:104px;height:auto;padding:0 84px;
  display:grid;grid-template-columns:minmax(210px,1fr) auto minmax(250px,1fr);align-items:center;gap:28px;
  background:rgba(10,10,15,.86);backdrop-filter:blur(22px);border-bottom:1px solid rgba(255,255,255,.10);
}
.yb-navbar:after{display:none}
.yb-navbar-logo{display:flex;align-items:center;gap:14px;font-weight:900;color:#7c6cff;letter-spacing:0}
.yb-navbar-logo img{width:50px;height:50px;border-radius:8px;object-fit:cover;box-shadow:0 0 22px rgba(99,102,241,.32)}
.yb-navbar-logo span{font-size:26px;line-height:1;color:#7a6cff}
.yb-navbar-menu{display:flex;align-items:center;justify-content:center;gap:18px;white-space:nowrap}
.yb-navbar-menu a{
  min-height:50px;display:inline-flex;align-items:center;padding:0 22px;border-radius:8px;
  color:rgba(255,255,255,.72);font-weight:900;font-size:18px;text-shadow:0 1px 0 rgba(0,0,0,.18);
  transition:background .18s,color .18s,transform .18s,box-shadow .18s;
}
.yb-navbar-menu a:hover{color:#fff;background:rgba(255,255,255,.06);transform:translateY(-1px)}
.yb-navbar-menu a.active{color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);box-shadow:0 10px 26px rgba(99,102,241,.34)}
.yb-user-menu{justify-self:end;margin:0;display:flex;align-items:center;gap:12px;flex-wrap:nowrap;background:transparent!important;padding:0!important}
.yb-user-chip{
  min-height:62px;border:1px solid rgba(255,255,255,.16);border-radius:999px;padding:0 18px 0 14px;
  display:inline-flex;align-items:center;gap:12px;background:rgba(255,255,255,.055);color:#fff;
  font-size:18px;font-weight:900;cursor:pointer;white-space:nowrap;
}
.yb-user-chip:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.26)}
.yb-avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#8ee9e8;color:#071016;font-weight:1000}
.yb-chevron{color:rgba(255,255,255,.72);font-size:18px;margin-left:6px}
.yb-user-meta{max-width:190px;color:rgba(255,255,255,.50);font-size:12px;line-height:1.35;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.yb-logout{height:40px;border:1px solid rgba(255,255,255,.12);border-radius:8px;background:transparent;color:rgba(255,255,255,.68);font-weight:800;padding:0 13px;cursor:pointer}
.yb-logout:hover{color:#fff;background:rgba(255,255,255,.07)}
.learner-main{position:relative;z-index:1;max-width:1400px;padding:68px 40px 80px}
.yb-theme-hero{grid-template-columns:minmax(0,1.04fr) 360px;gap:28px;align-items:stretch;margin-bottom:42px}
.yb-theme-hero .identity-card{
  min-height:390px;border:1px solid rgba(255,255,255,.10);border-radius:8px;padding:58px 58px 50px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;
  background:linear-gradient(180deg,rgba(18,18,31,.92),rgba(12,12,20,.96));
  box-shadow:0 24px 80px rgba(0,0,0,.34);
}
.yb-theme-hero .identity-card:after{display:none}
.yb-theme-hero .kicker{border:1px solid rgba(99,102,241,.38);border-radius:999px;color:#7c76ff;background:rgba(99,102,241,.12);padding:10px 26px;font-size:16px}
.yb-theme-hero #displayName{
  margin:28px 0 16px;font-size:clamp(46px,6vw,88px);line-height:.98;color:#fff;letter-spacing:0;font-weight:1000;
}
.yb-theme-hero #displayName:after{
  content:"的学习中枢";display:block;margin-top:12px;
  background:linear-gradient(90deg,#7c6cff,#35b6ff);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.yb-theme-hero #levelName{font-size:20px;color:rgba(255,255,255,.68);max-width:720px}
.yb-theme-hero .actions{justify-content:center;margin-top:30px}
.yb-theme-hero .panel.card{
  border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.045);box-shadow:0 20px 60px rgba(0,0,0,.26);padding:26px;
}
.yb-theme-hero h3,.section-title h2,.viewer-head h3{color:#fff;letter-spacing:0}
.learner-stats{grid-template-columns:1fr;gap:12px}
.mini-stat{border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.04);padding:20px}
.mini-stat b{color:#fff;font-size:36px}
.btn{border-radius:8px;min-height:48px;padding:0 20px}
.btn.yellow{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;box-shadow:0 10px 26px rgba(99,102,241,.28)}
.btn.blue,.btn.ghost{background:rgba(255,255,255,.045);color:#fff;border:1px solid rgba(255,255,255,.12)}
.course-browser{margin:0 0 22px}
.course-tabs{border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.035);padding:5px}
.course-tabs button{border-radius:6px;color:rgba(255,255,255,.68);font-size:15px}
.course-tabs button.on{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;box-shadow:none}
.input,.select{border:1px solid rgba(255,255,255,.12);border-radius:8px;background:rgba(255,255,255,.045);color:#fff}
.course-searchbar .input{background:rgba(255,255,255,.045)}
.course-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.learn-course{
  border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.04);box-shadow:0 18px 48px rgba(0,0,0,.25);color:#fff;
}
.learn-course:hover,.learn-course.active{border-color:rgba(99,102,241,.64);box-shadow:0 22px 58px rgba(0,0,0,.36),0 0 0 1px rgba(99,102,241,.22);transform:translateY(-4px)}
.learn-cover{margin:0;border-radius:8px 8px 0 0;aspect-ratio:16/8.5;box-shadow:none}
.learn-cover.auto-cover:before{background:linear-gradient(135deg,rgba(99,102,241,.72),rgba(6,182,212,.46)),linear-gradient(45deg,rgba(255,255,255,.14) 0 1px,transparent 1px 18px)}
.learn-cover.auto-cover h3{color:#fff;font-size:30px;text-shadow:0 3px 16px rgba(0,0,0,.42)}
.learn-cover.auto-cover h3:before{display:none}
.learn-course-body{background:transparent;padding:22px;min-height:154px}
.learn-course-body h3{color:#fff;font-size:22px;letter-spacing:0}
.course-summary,.course-card-meta,.sub{color:rgba(255,255,255,.66)}
.course-card-meta span:last-child{color:#8ee9e8}
.learn-course .progress{height:8px;background:rgba(255,255,255,.10)}
.learn-course .progress i{background:linear-gradient(90deg,#06b6d4,#8b5cf6)}
.badge{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;border-radius:8px}
.student-breadcrumb{color:rgba(255,255,255,.56)}
.student-breadcrumb a,.student-breadcrumb b{color:#fff}
.yb-learning-shell{grid-template-columns:minmax(292px,350px) minmax(0,1fr);gap:22px}
.lesson-panel,.viewer-panel{
  border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.04);box-shadow:0 22px 58px rgba(0,0,0,.25);
}
.lesson-tabs button{border:1px solid rgba(255,255,255,.12);border-radius:8px;color:#fff;background:rgba(255,255,255,.035)}
.lesson-tabs button.on{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}
.student-tree-chapter-title,.learn-lesson{
  border:1px solid rgba(255,255,255,.10);border-radius:8px;background:rgba(255,255,255,.035);color:rgba(255,255,255,.76);
}
.student-tree-chapter-title b,.learn-lesson b{color:#fff}
.lesson-type{border-radius:8px;background:linear-gradient(135deg,#06b6d4,#6366f1);color:#fff}
.learn-lesson:hover,.learn-lesson.active{border-color:rgba(99,102,241,.65);background:rgba(99,102,241,.14)}
.video-box,.pdf-reader{border:1px solid rgba(255,255,255,.10);border-radius:8px;background:#050508}
.viewer-panel #videoView,.viewer-panel #pdfView{border-radius:8px}
.pdf-page-card{border-radius:8px;background:rgba(255,255,255,.035)}
.modal-mask{backdrop-filter:blur(8px)}
.app-modal{border:1px solid rgba(255,255,255,.12);border-radius:8px;background:#12121a;box-shadow:0 24px 80px rgba(0,0,0,.46)}
.toast{border-radius:8px;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}
@media(max-width:1180px){
  .yb-navbar{padding:18px 28px;grid-template-columns:1fr;gap:16px;justify-items:start}
  .yb-navbar-menu{width:100%;justify-content:flex-start;overflow:auto;padding-bottom:4px}
  .yb-user-menu{justify-self:start;width:100%;justify-content:space-between}
  .yb-theme-hero{grid-template-columns:1fr}
  .course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
  .yb-navbar{padding:16px}
  .yb-navbar-logo span{font-size:22px}
  .yb-navbar-menu{gap:8px}
  .yb-navbar-menu a{min-height:42px;padding:0 14px;font-size:15px}
  .yb-user-menu{align-items:flex-start;flex-wrap:wrap}
  .yb-user-chip{min-height:50px;font-size:16px}
  .yb-user-meta{max-width:100%}
  .learner-main{padding:32px 16px 60px}
  .yb-theme-hero .identity-card{padding:36px 22px;min-height:320px}
  .course-grid{grid-template-columns:1fr}
}

/* Yongbang reference course list page */
body:has(.yb-reference-page){
  --bg-dark:#0a0a1a;
  --bg-card:rgba(255,255,255,.03);
  --border-subtle:rgba(255,255,255,.08);
  --border-glow:rgba(99,102,241,.30);
  --nav-primary-start:#6366f1;
  --nav-primary-end:#8b5cf6;
  --nav-border:rgba(255,255,255,.10);
  --gradient-primary:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);
  --gradient-accent:linear-gradient(135deg,#06b6d4 0%,#6366f1 100%);
  --text-primary:#fff;
  --text-secondary:rgba(255,255,255,.70);
  --text-muted:rgba(255,255,255,.50);
  background:var(--bg-dark);
  color:var(--text-primary);
}
body:has(.yb-reference-page) .bg{
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%,rgba(99,102,241,.15) 0%,transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 50%,rgba(139,92,246,.10) 0%,transparent 50%),
    radial-gradient(ellipse 50% 30% at 0% 80%,rgba(6,182,212,.08) 0%,transparent 50%);
}
.yb-reference-page{position:relative;z-index:1;min-height:100vh;background:transparent;color:var(--text-primary)}
.yb-reference-page .navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  min-height:0;height:auto;padding:16px 40px;
  display:block;background:rgba(10,10,15,.86);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(255,255,255,.10);transition:all .25s ease;
}
.yb-reference-page .navbar:after{display:none}
.yb-reference-page .navbar.scrolled{padding:16px 40px;background:rgba(10,10,15,.86)}
.yb-reference-page .navbar-container{
  max-width:1400px;margin:0 auto;display:grid;
  grid-template-columns:minmax(220px,1fr) auto minmax(220px,1fr);
  align-items:center;gap:24px;
}
.yb-reference-page .navbar-logo{
  display:flex;align-items:center;gap:12px;text-decoration:none;color:#fff;font-weight:800;
}
.yb-reference-page .navbar-logo img{width:40px;height:40px;object-fit:cover;border-radius:8px}
.yb-reference-page .navbar-logo span{
  font-size:20px;font-weight:800;background:linear-gradient(135deg,#6366f1,#8b5cf6);
  -webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent;
}
.yb-reference-page .navbar-menu{
  display:flex;align-items:center;justify-content:center;gap:8px;list-style:none;margin:0;padding:0;white-space:nowrap;
}
.yb-reference-page .navbar-menu a{
  display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:8px;
  color:rgba(255,255,255,.70);font-size:15px;font-weight:600;line-height:1.2;
  transition:all .25s ease;text-decoration:none;white-space:nowrap;
}
.yb-reference-page .navbar-menu a:hover,
.yb-reference-page .navbar-menu a.active{
  color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);box-shadow:0 0 16px rgba(99,102,241,.40);
}
.yb-reference-page .navbar-actions{
  position:relative;justify-self:end;display:flex;align-items:center;justify-content:flex-end;gap:12px;
}
.yb-reference-page .user-btn{
  min-width:150px;display:grid;grid-template-columns:34px minmax(0,1fr) 15px;align-items:center;gap:10px;
  padding:7px 12px;border:1px solid rgba(255,255,255,.14);border-radius:999px;color:#fff;
  background:rgba(255,255,255,.06);cursor:pointer;font:inherit;
}
.yb-reference-page .user-avatar{
  width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
  color:#071016;background:#8ee9e8;font-size:0;
}
.yb-reference-page .user-avatar::before{
  content:"";width:16px;height:16px;border-radius:50%;background:#071016;box-shadow:0 13px 0 5px #071016;
}
.yb-reference-page .user-btn span:not(.user-avatar){
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:left;font-weight:700;
}
.yb-reference-page .user-dropdown{
  position:absolute;top:56px;right:0;width:160px;padding:8px;display:none;
  border:1px solid rgba(255,255,255,.10);border-radius:14px;background:rgba(20,20,32,.96);
  box-shadow:0 24px 60px rgba(0,0,0,.32);
}
.yb-reference-page .user-menu.open .user-dropdown,
.yb-reference-page .user-menu:hover .user-dropdown{display:block}
.yb-reference-page .user-dropdown a,
.yb-reference-page .user-dropdown button{
  width:100%;display:block;padding:10px 12px;border:0;border-radius:8px;color:rgba(255,255,255,.70);
  background:transparent;cursor:pointer;font:inherit;text-align:left;text-decoration:none;
}
.yb-reference-page .user-dropdown a:hover,
.yb-reference-page .user-dropdown button:hover{color:#fff;background:rgba(255,255,255,.07)}
.yb-reference-page .user-dropdown .logout{color:#ff8b99}
.yb-reference-page .hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer}
.yb-reference-page .hamburger span{width:24px;height:2px;background:#fff;border-radius:2px}
.yb-reference-page .mobile-menu{
  display:none;position:fixed;top:72px;left:0;right:0;z-index:999;padding:20px;
  background:rgba(10,10,15,.98);border-bottom:1px solid var(--nav-border);flex-direction:column;gap:14px;
}
.yb-reference-page .mobile-menu.active{display:flex}
.yb-reference-page .mobile-menu a{color:var(--text-secondary);text-decoration:none;font-size:16px;padding:8px 0}
.yb-reference-page .hero-section{padding:120px 2rem 60px;position:relative;overflow:hidden}
.yb-reference-page .hero-carousel{
  position:relative;max-width:1400px;margin:0 auto;height:420px;border-radius:24px;overflow:hidden;
  box-shadow:0 25px 80px rgba(0,0,0,.50),0 0 100px rgba(99,102,241,.20);
}
.yb-reference-page .carousel-slides{position:relative;width:100%;height:100%}
.yb-reference-page .carousel-slide{position:absolute;inset:0;opacity:0;transition:opacity 1s ease;display:flex;align-items:center;justify-content:center}
.yb-reference-page .carousel-slide.active{opacity:1}
.yb-reference-page .carousel-slide:before{content:"";position:absolute;inset:0;opacity:.9}
.yb-reference-page .slide-1:before{background:linear-gradient(135deg,#1a1a3e 0%,#2d1b4e 50%,#1e3a5f 100%)}
.yb-reference-page .slide-2:before{background:linear-gradient(135deg,#0f2027 0%,#203a43 50%,#2c5364 100%)}
.yb-reference-page .slide-3:before{background:linear-gradient(135deg,#1a0a2e 0%,#16213e 50%,#0f3460 100%)}
.yb-reference-page .slide-content{position:relative;z-index:2;text-align:center;padding:2rem;max-width:800px}
.yb-reference-page .slide-content h1{font-size:3rem;font-weight:800;margin:0 0 1rem;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent}
.yb-reference-page .slide-content h2{font-size:2.5rem;font-weight:700;margin:0 0 1rem;color:var(--text-primary)}
.yb-reference-page .slide-content p{font-size:1.1rem;color:var(--text-secondary);margin:0 0 1.5rem}
.yb-reference-page .slide-badge{display:inline-block;padding:.5rem 1rem;background:rgba(99,102,241,.20);border:1px solid rgba(99,102,241,.30);border-radius:50px;font-size:.85rem;color:#a5b4fc;margin-bottom:18px}
.yb-reference-page .slide-decoration{position:absolute;border-radius:50%;filter:blur(60px);opacity:.4;animation:ybFloat 8s ease-in-out infinite}
.yb-reference-page .slide-decoration:nth-child(1){width:300px;height:300px;background:#6366f1;top:-100px;right:-100px}
.yb-reference-page .slide-decoration:nth-child(2){width:200px;height:200px;background:#8b5cf6;bottom:-50px;left:-50px;animation-delay:-4s}
@keyframes ybFloat{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-20px) scale(1.05)}}
.yb-reference-page .carousel-controls{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:1rem;z-index:10}
.yb-reference-page .carousel-dots{display:flex;gap:8px}
.yb-reference-page .carousel-dot{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.3);cursor:pointer;transition:all .3s ease}
.yb-reference-page .carousel-dot.active{background:#6366f1;box-shadow:0 0 15px rgba(99,102,241,.6);transform:scale(1.2)}
.yb-reference-page .carousel-arrow{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.20);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;transition:all .3s ease}
.yb-reference-page .carousel-arrow:hover{background:rgba(99,102,241,.30);border-color:#6366f1}
.yb-reference-page .main-content{max-width:1400px;margin:0 auto;padding:60px 2rem;display:flex;gap:40px}
.yb-reference-page .sidebar{width:240px;flex-shrink:0;position:sticky;top:100px;height:fit-content;background:transparent;padding:0;border:0;border-radius:0}
.yb-reference-page .category-list{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:1rem;backdrop-filter:blur(10px)}
.yb-reference-page .category-title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);padding:.5rem 1rem;margin-bottom:.5rem}
.yb-reference-page .category-item{display:flex;align-items:center;gap:.75rem;padding:.85rem 1rem;border-radius:10px;cursor:pointer;transition:all .3s ease;color:var(--text-secondary)}
.yb-reference-page .category-item:hover{background:rgba(255,255,255,.05);color:var(--text-primary)}
.yb-reference-page .category-list .category-item:not(.active){background:transparent;box-shadow:none}
.yb-reference-page .category-item.active{background:var(--gradient-primary);color:var(--text-primary);box-shadow:0 4px 20px rgba(99,102,241,.30)}
.yb-reference-page .category-icon{font-size:1.2rem;width:28px;text-align:center}
.yb-reference-page .category-name{flex:1;font-size:.9rem;font-weight:500}
.yb-reference-page .category-count{font-size:.75rem;background:rgba(255,255,255,.10);padding:2px 8px;border-radius:10px}
.yb-reference-page .category-item.active .category-count{background:rgba(255,255,255,.20)}
.yb-reference-page .sidebar-divider{height:1px;background:linear-gradient(90deg,transparent,var(--border-subtle),transparent);margin:16px 0}
.yb-reference-page .sidebar-section-title{font-size:.7rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:1.5px;padding:0 16px;margin-bottom:8px}
.yb-reference-page .level-dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-right:6px;flex-shrink:0}
.yb-reference-page .dot-free{background:#22c55e;box-shadow:0 0 6px rgba(34,197,94,.5)}
.yb-reference-page .dot-paid{background:#f59e0b;box-shadow:0 0 6px rgba(245,158,11,.5)}
.yb-reference-page .dot-vip{background:#eab308;box-shadow:0 0 6px rgba(234,179,8,.5)}
.yb-reference-page .dot-svip{background:#a855f7;box-shadow:0 0 6px rgba(168,85,247,.5)}
.yb-reference-page .courses-area{flex:1;min-width:0}

/* Yongbang reference course learning page */
#courseDetail.course-detail-page{
  padding-top:88px;
  min-height:100vh;
  color:var(--text-primary);
}
#courseDetail .student-breadcrumb{
  max-width:1400px;
  margin:0 auto;
  padding:24px 40px;
}
#courseDetail .breadcrumb-nav{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  color:var(--text-muted);
  font-size:14px;
}
#courseDetail .breadcrumb-nav a{
  color:var(--text-muted);
  text-decoration:none;
  transition:color .3s ease, transform .3s ease, border-color .3s ease, background .3s ease;
}
#courseDetail .breadcrumb-nav a:hover{color:var(--text-primary)}
#courseDetail #crumbCourseCategory{color:#a5b4fc;font-weight:800}
#courseDetail #crumbCourseCategory:hover{color:#fff}
#courseDetail .breadcrumb-divider{color:rgba(255,255,255,.15);margin:0 4px}
#courseDetail .breadcrumb-nav .current{
  color:var(--text-secondary);
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
#courseDetail .learning-section{
  max-width:1400px;
  margin:0 auto;
  padding:0 40px 60px;
  display:flex;
  gap:32px;
  align-items:flex-start;
  transition:gap .28s ease;
}
#courseDetail .video-area{
  flex:1;
  min-width:0;
}
#courseDetail .video-player{
  position:relative;
  width:100%;
  aspect-ratio:16/9;
  min-height:420px;
  background:linear-gradient(135deg,#1a1a2e,#16213e);
  border:1px solid var(--border-subtle);
  border-radius:16px;
  overflow:hidden;
  box-shadow:0 16px 48px rgba(0,0,0,.50);
}
#courseDetail .viewer-head{
  position:absolute;
  top:0;
  left:0;
  right:0;
  z-index:4;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:18px;
  padding:22px 26px;
  background:linear-gradient(180deg,rgba(10,10,15,.86),rgba(10,10,15,0));
  pointer-events:none;
}
#courseDetail .viewer-head h3{
  margin:0 0 6px;
  color:#fff;
  font-size:20px;
  font-weight:700;
  letter-spacing:0;
}
#courseDetail .viewer-head .sub{
  max-width:720px;
  margin:0;
  color:rgba(255,255,255,.62);
  font-size:13px;
}
#courseDetail .lesson-sync{
  flex-shrink:0;
  padding:6px 12px;
  border:1px solid rgba(255,255,255,.12);
  border-radius:999px;
  background:rgba(255,255,255,.06);
  color:rgba(255,255,255,.72);
  font-size:12px;
  font-weight:600;
  backdrop-filter:blur(10px);
}
#courseDetail .video-placeholder{
  position:absolute;
  inset:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:18px;
  background:
    radial-gradient(circle at 50% 45%,rgba(99,102,241,.20),transparent 34%),
    linear-gradient(135deg,rgba(99,102,241,.10),rgba(139,92,246,.10));
}
#courseDetail .video-placeholder-icon{
  width:80px;
  height:80px;
  border:0;
  border-radius:50%;
  background:var(--gradient-primary);
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  box-shadow:0 8px 32px rgba(99,102,241,.40);
  transition:all .3s ease;
}
#courseDetail .video-placeholder-icon:hover{
  transform:scale(1.08);
  box-shadow:0 12px 40px rgba(99,102,241,.60);
}
#courseDetail .video-placeholder-icon svg{
  width:32px;
  height:32px;
  fill:#fff;
  margin-left:4px;
}
#courseDetail .video-placeholder-text{
  color:var(--text-secondary);
  font-size:16px;
}
#courseDetail .video-view,
#courseDetail .pdf-view{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
}
#courseDetail .video-box{
  width:100%;
  height:100%;
  border:0;
  border-radius:0;
  background:#000;
  display:block;
  overflow:hidden;
  position:relative;
}
#courseDetail #aliyunPlayer,
#courseDetail #aliyunPlayer video{
  border-radius:0!important;
}
#courseDetail .video-control{
  position:absolute;
  left:24px;
  right:24px;
  bottom:22px;
  z-index:5;
}
#courseDetail .control-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  color:rgba(255,255,255,.76);
  font-size:13px;
}
#courseDetail .pdf-reader{
  width:100%;
  height:100%;
  padding:78px 22px 22px;
  border:0;
  border-radius:0;
  background:linear-gradient(135deg,rgba(99,102,241,.08),rgba(6,182,212,.06));
  overflow:hidden;
}
#courseDetail .pdf-page-card{
  width:100%;
  height:100%;
  padding:0;
  overflow:hidden;
  border:1px solid rgba(255,255,255,.10);
  border-radius:14px;
  background:rgba(255,255,255,.96);
}
#courseDetail #studentPdfFrame{
  width:100%;
  height:100%;
  border:0;
  border-radius:14px;
  background:#fff;
}
#courseDetail .reader-actions{
  position:absolute;
  left:22px;
  right:22px;
  bottom:22px;
  z-index:7;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  pointer-events:auto;
}
#courseDetail .course-info{
  margin-top:28px;
  background:var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius:16px;
  padding:28px;
  backdrop-filter:blur(10px);
}
#courseDetail .course-header{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px;
  margin-bottom:20px;
}
#courseDetail .course-title-area{flex:1;min-width:0}
#courseDetail .course-title{
  margin:0 0 12px;
  font-size:26px;
  font-weight:700;
  letter-spacing:0;
  background:linear-gradient(135deg,var(--text-primary),var(--text-secondary));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
#courseDetail .course-meta{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:20px;
  color:var(--text-muted);
  font-size:14px;
}
#courseDetail .course-meta-item,
#courseDetail .instructor-info{
  display:flex;
  align-items:center;
  gap:8px;
}
#courseDetail .course-meta-item svg{width:16px;height:16px;opacity:.72}
#courseDetail .instructor-avatar{
  width:36px;
  height:36px;
  border-radius:50%;
  background:var(--gradient-primary);
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-weight:700;
  font-size:14px;
}
#courseDetail .instructor-name{color:var(--text-secondary);font-size:14px}
#courseDetail .badge-svip{
  display:inline-flex;
  align-items:center;
  gap:5px;
  padding:6px 12px;
  border-radius:20px;
  background:linear-gradient(135deg,#8b5cf6,#a855f7);
  color:#fff;
  font-size:12px;
  font-weight:700;
  white-space:nowrap;
}
#courseDetail .badge-svip svg{width:12px;height:12px}
#courseDetail .course-intro{
  margin:0;
  padding-top:20px;
  border-top:1px solid var(--border-subtle);
  color:var(--text-secondary);
  font-size:15px;
  line-height:1.75;
}
#courseDetail .learning-status-card{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
  margin-top:22px;
}
#courseDetail .learning-status-card>div{
  min-width:0;
  padding:14px 16px;
  border:1px solid rgba(255,255,255,.08);
  border-radius:14px;
  background:rgba(255,255,255,.035);
}
#courseDetail .learning-status-card span{
  display:block;
  margin-bottom:6px;
  color:var(--text-muted);
  font-size:12px;
}
#courseDetail .learning-status-card strong{
  display:block;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  color:#fff;
  font-size:16px;
  font-weight:700;
}
#courseDetail .learning-sidebar{
  width:400px;
  flex-shrink:0;
  position:static;
  background:transparent;
  border:0;
  padding:0;
  transition:width .28s ease;
}
#courseDetail .course-toc{
  position:sticky;
  top:100px;
  overflow:hidden;
  background:var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius:16px;
  backdrop-filter:blur(10px);
  box-shadow:0 18px 52px rgba(0,0,0,.28);
  transition:border-color .28s ease, background .28s ease;
}
#courseDetail .toc-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:20px 24px 16px;
  border-bottom:1px solid var(--border-subtle);
}
#courseDetail .toc-title-wrap{min-width:0}
#courseDetail .toc-kicker{
  display:block;
  margin-bottom:4px;
  color:#a5b4fc;
  font-size:11px;
  font-weight:800;
  letter-spacing:1.4px;
  text-transform:uppercase;
}
#courseDetail .toc-title{
  margin:0;
  color:#fff;
  font-size:18px;
  font-weight:700;
}
#courseDetail .chapter-list{
  max-height:600px;
  overflow-y:auto;
  padding:0 10px 12px;
}
#courseDetail .chapter-list::-webkit-scrollbar{width:4px}
#courseDetail .chapter-list::-webkit-scrollbar-track{background:transparent}
#courseDetail .chapter-list::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:2px}
#courseDetail .student-tree-chapter{
  padding:0;
}
#courseDetail .student-tree-chapter-title{
  width:100%;
  margin:0;
  padding:14px 24px 10px;
  border:0;
  border-radius:0;
  background:transparent;
  color:rgba(255,255,255,.72);
  display:flex;
  gap:10px;
  align-items:center;
  text-align:left;
  font-size:13px;
  border-left:3px solid transparent;
  cursor:pointer;
  transition:background .24s ease,border-color .24s ease,color .24s ease;
}
#courseDetail .student-tree-chapter-title:hover{
  background:rgba(255,255,255,.035);
}
#courseDetail .student-tree-chapter-title b{
  flex:1;
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  color:#fff;
  font-size:14px;
  font-weight:700;
}
#courseDetail .chapter-folder{flex-shrink:0}
#courseDetail .chapter-toggle{
  width:26px;
  height:26px;
  border-radius:8px;
  display:grid;
  place-items:center;
  color:#a5b4fc;
  background:rgba(99,102,241,.12);
  font-size:20px;
  line-height:1;
  flex-shrink:0;
  transform:rotate(90deg);
  transition:transform .22s ease,background .22s ease;
}
#courseDetail .student-tree-chapter.chapter-collapsed>.student-tree-chapter-title .chapter-toggle{
  transform:rotate(0deg);
  background:rgba(255,255,255,.06);
}
#courseDetail .student-tree-chapter.active-chapter>.student-tree-chapter-title{
  background:rgba(99,102,241,.10);
  border-left-color:#6366f1;
}
#courseDetail .student-tree-chapter.active-chapter>.student-tree-chapter-title b{
  color:#c4b5fd;
}
#courseDetail .student-tree-children{
  padding:0;
}
#courseDetail .student-tree-chapter.chapter-collapsed>.student-tree-children{
  display:none;
}
#courseDetail .chapter-item{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  margin:8px 0;
  padding:14px 14px;
  padding-left:calc(14px + var(--depth,0) * 16px);
  border:1px solid rgba(255,255,255,.08);
  border-radius:14px;
  background:rgba(255,255,255,.035);
  color:var(--text-secondary);
  cursor:pointer;
  transition:all .3s ease;
}
#courseDetail .chapter-item:hover{
  border-color:rgba(99,102,241,.36);
  background:rgba(99,102,241,.08);
  transform:translateX(-2px);
}
#courseDetail .chapter-item.active{
  background:linear-gradient(90deg,rgba(99,102,241,.15),rgba(139,92,246,.08));
  border-color:rgba(99,102,241,.50);
  box-shadow:inset 3px 0 0 #6366f1,0 12px 28px rgba(0,0,0,.22);
}
#courseDetail .chapter-number{
  width:32px;
  height:32px;
  border-radius:8px;
  background:#12121a;
  border:1px solid rgba(255,255,255,.10);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--text-muted);
  font-size:12px;
  font-weight:700;
  flex-shrink:0;
}
#courseDetail .chapter-item.active .chapter-number{
  border-color:transparent;
  background:var(--gradient-primary);
  color:#fff;
}
#courseDetail .chapter-info{
  flex:1;
  min-width:0;
}
#courseDetail .chapter-name{
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  margin-bottom:4px;
  color:#fff;
  font-size:14px;
  font-weight:600;
}
#courseDetail .chapter-duration{
  color:var(--text-muted);
  font-size:12px;
}
#courseDetail .chapter-status{
  flex-shrink:0;
  color:var(--text-muted);
  font-size:12px;
}
#courseDetail .chapter-item.completed .chapter-status{color:#10b981}
#courseDetail .chapter-item.active .chapter-status{color:#06b6d4}
@media(max-width:1100px){
  #courseDetail .learning-section{flex-direction:column}
  #courseDetail .learning-sidebar{width:100%}
  #courseDetail .course-toc{position:relative;top:auto}
}
@media(max-width:760px){
  #courseDetail{padding-top:80px}
  #courseDetail .student-breadcrumb{padding:18px 18px}
  #courseDetail .breadcrumb-nav{flex-wrap:wrap}
  #courseDetail .learning-section{padding:0 18px 44px;gap:22px}
  #courseDetail .video-player{min-height:300px;border-radius:14px}
  #courseDetail .viewer-head{position:relative;background:rgba(10,10,15,.92);padding:16px;flex-direction:column}
  #courseDetail .video-placeholder,
  #courseDetail .video-view,
  #courseDetail .pdf-view{top:92px;height:calc(100% - 92px)}
  #courseDetail .course-info{padding:20px;border-radius:14px}
  #courseDetail .course-header{flex-direction:column}
  #courseDetail .course-title{font-size:22px}
  #courseDetail .learning-status-card{grid-template-columns:1fr}
  #courseDetail .toc-header{padding:18px}
  #courseDetail .chapter-item{padding:14px 18px;padding-left:calc(18px + var(--depth,0) * 12px)}
}
.yb-reference-page .courses-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem;gap:18px}
.yb-reference-page .courses-title{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin:0}
.yb-reference-page .courses-count{color:var(--text-muted);font-size:.9rem}
.yb-reference-page .courses-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.yb-reference-page .course-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;overflow:hidden;transition:all .4s ease;opacity:1;transform:translateY(0);cursor:pointer}
.yb-reference-page .course-card:hover{transform:translateY(-8px);border-color:var(--border-glow);box-shadow:0 20px 60px rgba(0,0,0,.40),0 0 40px rgba(99,102,241,.15)}
.yb-reference-page .course-thumbnail{position:relative;aspect-ratio:16/9;overflow:hidden}
.yb-reference-page .course-thumbnail-bg{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background-size:cover;background-position:center}
.yb-reference-page .thumb-1{background:linear-gradient(135deg,#1e3a5f 0%,#0d1b2a 100%)}
.yb-reference-page .thumb-2{background:linear-gradient(135deg,#2d1b4e 0%,#1a1a3e 100%)}
.yb-reference-page .thumb-3{background:linear-gradient(135deg,#0f3460 0%,#16213e 100%)}
.yb-reference-page .thumb-4{background:linear-gradient(135deg,#1a0a2e 0%,#2d1b4e 100%)}
.yb-reference-page .thumb-5{background:linear-gradient(135deg,#1a3a3a 0%,#0f2027 100%)}
.yb-reference-page .thumb-6{background:linear-gradient(135deg,#2c3e50 0%,#1a252f 100%)}
.yb-reference-page .thumb-7{background:linear-gradient(135deg,#3d1e3d 0%,#1a0a1a 100%)}
.yb-reference-page .thumb-8{background:linear-gradient(135deg,#1a2a3a 0%,#0a1520 100%)}
.yb-reference-page .play-icon{width:60px;height:60px;background:rgba(255,255,255,.15);backdrop-filter:blur(10px);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.5rem;transition:all .3s ease;border:2px solid rgba(255,255,255,.20)}
.yb-reference-page .course-card:hover .play-icon{transform:scale(1.1);background:var(--gradient-primary);border-color:transparent}
.yb-reference-page .course-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.70);padding:4px 10px;border-radius:6px;font-size:.75rem;font-weight:500}
.yb-reference-page .course-info{padding:1.25rem}
.yb-reference-page .course-tags{display:flex;gap:8px;margin-bottom:.75rem;flex-wrap:wrap}
.yb-reference-page .course-tag{padding:3px 10px;border-radius:6px;font-size:.7rem;font-weight:600;text-transform:uppercase}
.yb-reference-page .tag-hot{background:rgba(239,68,68,.20);color:#fca5a5;border:1px solid rgba(239,68,68,.30)}
.yb-reference-page .tag-new{background:rgba(34,197,94,.20);color:#86efac;border:1px solid rgba(34,197,94,.30)}
.yb-reference-page .tag-practical{background:rgba(99,102,241,.20);color:#a5b4fc;border:1px solid rgba(99,102,241,.30)}
.yb-reference-page .course-level-badge{position:absolute;top:10px;right:10px;padding:4px 12px;border-radius:20px;font-size:.7rem;font-weight:700;letter-spacing:.5px;z-index:2;backdrop-filter:blur(8px)}
.yb-reference-page .level-free{background:rgba(34,197,94,.25);color:#86efac;border:1px solid rgba(34,197,94,.4);box-shadow:0 0 12px rgba(34,197,94,.2)}
.yb-reference-page .level-paid{background:rgba(245,158,11,.25);color:#fcd34d;border:1px solid rgba(245,158,11,.4);box-shadow:0 0 12px rgba(245,158,11,.2)}
.yb-reference-page .level-vip{background:linear-gradient(135deg,rgba(234,179,8,.35),rgba(245,158,11,.25));color:#fde68a;border:1px solid rgba(234,179,8,.5);box-shadow:0 0 15px rgba(234,179,8,.3)}
.yb-reference-page .level-svip{background:linear-gradient(135deg,rgba(168,85,247,.35),rgba(236,72,153,.25));color:#e9d5ff;border:1px solid rgba(168,85,247,.5);box-shadow:0 0 15px rgba(168,85,247,.3)}
.yb-reference-page .course-title{font-size:1rem;font-weight:600;margin:0 0 .5rem;color:var(--text-primary);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yb-reference-page .course-lecturer{font-size:.8rem;color:var(--text-muted);margin:0 0 .5rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yb-reference-page .course-meta{display:flex;align-items:center;justify-content:space-between;padding-top:.75rem;border-top:1px solid var(--border-subtle);gap:12px}
.yb-reference-page .course-students{font-size:.8rem;color:var(--text-muted);display:flex;align-items:center;gap:4px}
.yb-reference-page .course-rating{font-size:.8rem;color:#fbbf24;display:flex;align-items:center;gap:4px}
.yb-reference-page .course-pager{display:flex;align-items:center;justify-content:center;gap:14px;margin:28px 0 0;color:var(--text-secondary);font-weight:600;flex-wrap:wrap}
.yb-reference-page .course-pager .btn{border-radius:10px;background:rgba(255,255,255,.06);border:1px solid var(--border-subtle);color:var(--text-primary);min-height:42px}
.yb-reference-page .modal-mask.show{display:flex}
@media(max-width:1200px){.yb-reference-page .courses-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){
  .yb-reference-page .navbar{padding:14px 20px}
  .yb-reference-page .navbar-menu,.yb-reference-page .navbar-actions{display:none}
  .yb-reference-page .hamburger{display:flex}
  .yb-reference-page .main-content{flex-direction:column;padding:40px 1rem}
  .yb-reference-page .sidebar{position:static;width:100%}
  .yb-reference-page .category-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
  .yb-reference-page .category-title,.yb-reference-page .sidebar-section-title,.yb-reference-page .sidebar-divider{grid-column:1/-1}
}
@media(max-width:640px){
  .yb-reference-page .hero-section{padding:100px 1rem 36px}
  .yb-reference-page .hero-carousel{height:330px;border-radius:16px}
  .yb-reference-page .slide-content h1{font-size:2rem}
  .yb-reference-page .slide-content h2{font-size:1.45rem}
  .yb-reference-page .courses-grid,.yb-reference-page .category-list{grid-template-columns:1fr}
  .yb-reference-page .courses-header{align-items:flex-start;flex-direction:column}
}