@charset "UTF-8";
:root{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#243732;background:#f6f5f0;font-synthesis:none;--green:#244e42;--muted:#77817a;--line:#e1e5dc;--paper:#fffefa;--gold:#a78546}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;border:1px solid var(--line);background:var(--paper);color:var(--green);padding:10px 16px;border-radius:7px;font-size:14px}button:hover:not(:disabled){background:#edf2e9;border-color:#a8baaa}button:disabled{cursor:not-allowed;opacity:.5}.primary{background:var(--green);color:white;border-color:var(--green)}.primary:hover:not(:disabled){background:#326653;color:white}.danger{color:#a64735}.quiet{background:transparent;border-color:transparent}.small{padding:6px 10px;font-size:12px}input,select,textarea{background:#fff;border:1px solid #d4dbd1;border-radius:6px;padding:11px 12px;min-width:0;color:#243732}input:focus,select:focus,textarea:focus{outline:2px solid #a4b9a5}label{display:block;font-size:13px;color:#58655b}label input,label textarea{display:block;width:100%;margin-top:8px}h1,h2,h3,p{margin-top:0}h1,h2{font-family:"Songti SC","SimSun",serif;font-weight:600}h1{font-size:34px;line-height:1.5;letter-spacing:2px}h2{font-size:25px;line-height:1.5}h3{font-size:16px}p{line-height:1.8}.muted{color:var(--muted);font-size:13px}.eyebrow{letter-spacing:3px;color:var(--gold);font-size:11px;font-weight:bold;margin-bottom:14px}.brand{display:flex;gap:12px;align-items:center;font-family:"SimSun",serif;font-weight:bold;font-size:24px;letter-spacing:3px}.seal{display:grid;place-items:center;width:39px;height:39px;background:var(--green);color:#fff;border-radius:50%;font-size:22px;letter-spacing:0}.site-header{height:86px;display:flex;align-items:center;justify-content:space-between;padding:0 4vw;border-bottom:1px solid var(--line);background:var(--paper)}.site-header nav{display:flex;gap:12px;align-items:center}.site-header .user{font-size:13px;margin-left:14px}.badge{display:inline-block;border-radius:4px;background:#eef2e8;color:#527253;padding:4px 7px;font-size:11px}.layout{max-width:1440px;margin:0 auto;padding:34px 4vw 60px}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:26px}.page-heading h1{margin-bottom:8px}.course-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}.course-tabs button.active{background:var(--green);color:white}.study-grid{display:grid;grid-template-columns:minmax(0,1fr) 355px;gap:26px;align-items:start}.panel{background:var(--paper);border:1px solid var(--line);border-radius:11px;overflow:hidden}.panel-pad{padding:23px}.video-stage{position:relative;background:#172a25;aspect-ratio:16/9;color:#f3f3e8;overflow:hidden}.video-stage video{display:block;width:100%;height:100%;background:#10201b}.video-stage .placeholder{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:25px;background:radial-gradient(ellipse at 50% 0,#34584a,transparent 70%)}.placeholder .ornament{font-family:serif;font-size:55px;color:#a9bc9d;margin-bottom:20px}.placeholder h2{font-size:28px;margin-bottom:12px}.placeholder p{font-size:13px;color:#c0cec0;max-width:420px}.watermark{position:absolute;top:12%;right:7%;opacity:.4;color:white;pointer-events:none;font-size:13px;z-index:2;text-shadow:0 1px 3px #000}.player-info{padding:23px}.player-info h2{font-size:22px;margin:8px 0 16px}.player-tools{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.player-tools select{padding:8px;font-size:13px}.hint-card{margin-top:20px;padding:20px 24px;border-left:3px solid #b9ac7f;background:#f0f0e5;font-size:13px;line-height:1.8}.catalog-head{padding:22px;border-bottom:1px solid var(--line)}.catalog-head h3{margin:0 0 9px}.catalog-head input{width:100%;margin-top:14px;font-size:13px}.lesson-list{max-height:660px;overflow:auto;padding:8px}.lesson{width:100%;display:flex;gap:12px;text-align:left;align-items:flex-start;border:0;border-radius:5px;padding:14px 11px;margin:2px 0;background:transparent}.lesson.active{background:#eaf0e4}.lesson.locked{color:#858e83;opacity:1}.lesson .number{font-size:12px;min-width:24px;padding-top:2px;color:#899580}.lesson .lesson-copy{flex:1;min-width:0}.lesson-title{font-size:13px;line-height:1.7;display:block}.lesson-status{font-size:11px;display:block;color:#8d968a;margin-top:4px}.lesson.active .lesson-status{color:var(--green)}.empty{padding:45px 24px;text-align:center;color:#7a8376;font-size:14px}.admin-grid{display:grid;grid-template-columns:245px minmax(0,1fr);gap:24px;align-items:start}.student-item{display:block;width:100%;text-align:left;padding:15px;border:0;border-bottom:1px solid #eceee7;border-radius:0}.student-item.active{background:#eaf0e4;border-left:3px solid var(--green)}.student-item strong{display:block;margin-bottom:7px}.student-item span{font-size:12px;color:var(--muted)}.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:16px 0}.toolbar .spacer{flex:1}.section-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-header h2{margin:0}.user-note{display:flex;gap:8px;margin:14px 0}.user-note input{flex:1}.grant-grid{max-height:460px;overflow:auto;border:1px solid var(--line);border-radius:7px}.grant-row{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid #eeeee6;font-size:13px;line-height:1.6}.grant-row input{width:17px;height:17px;accent-color:var(--green);flex-shrink:0}.grant-row .title{flex:1}.grant-row .tag{font-size:11px;color:#87917f;white-space:nowrap}.grant-row.granted .tag{color:var(--green)}.grant-preview{padding:15px;background:#eef2e6;border-radius:6px;margin:12px 0;font-size:13px;line-height:1.8}.grant-preview ol{margin:5px 0 10px;padding-left:20px}.tabs{display:flex;gap:15px;border-bottom:1px solid var(--line);margin:22px 0}.tabs button{border:0;border-radius:0;background:transparent;padding:12px 5px}.tabs button.active{border-bottom:2px solid var(--green);font-weight:bold}.record{border-bottom:1px solid var(--line);padding:15px 0}.record p{margin:5px 0;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.record strong{font-size:14px}.audit{font-size:12px;padding:12px 0;line-height:1.8;border-bottom:1px solid var(--line);overflow-wrap:anywhere}dialog{border:1px solid var(--line);border-radius:12px;width:min(480px,calc(100% - 32px));padding:28px;background:var(--paper);color:inherit}dialog::backdrop{background:#172a2566}dialog form{display:grid;gap:17px}dialog h2{margin-bottom:2px}dialog .actions{display:flex;justify-content:flex-end;gap:8px;margin-top:8px}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#244e42;color:white;padding:13px 24px;border-radius:8px;max-width:90vw;z-index:20;box-shadow:0 8px 28px #0002}.login-page{min-height:100vh;display:grid;grid-template-columns:1.05fr 1fr}.login-art{background:#264b3f;color:#edeedf;padding:60px 6vw;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.login-art .brand{color:#eff0df}.login-art .seal{background:#eeeeda;color:#284a3e}.login-art .big-type{font-family:"SimSun",serif;font-size:clamp(45px,5vw,72px);letter-spacing:10px;line-height:1.7;margin:45px 0 22px}.login-art p{color:#b6c7b6;font-size:14px;max-width:330px}.login-art .circle{position:absolute;width:450px;height:450px;border:1px solid #c3caa324;border-radius:50%;bottom:-180px;right:-150px;box-shadow:0 0 0 55px #c3caa30b,0 0 0 110px #c3caa308}.login-form-side{display:flex;align-items:center;justify-content:center;padding:45px}.login-form{width:100%;max-width:355px}.login-form h1{margin-bottom:10px}.login-form form{display:grid;gap:23px;margin-top:35px}.login-form .primary{padding:14px}.login-error{color:#a64735;font-size:13px;min-height:18px;margin:0}.loading{padding:80px;text-align:center}.footer{font-size:11px;color:#909788;margin-top:32px;letter-spacing:1px}.course-editor{display:grid;grid-template-columns:60px 1fr auto auto;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}.course-editor input[type=text]{width:100%}@media(max-width:1000px){.study-grid{grid-template-columns:minmax(0,1fr) 300px}.layout{padding:24px}.admin-grid{grid-template-columns:200px minmax(0,1fr)}}@media(max-width:760px){.site-header{height:auto;min-height:72px;padding:15px 18px;gap:12px;flex-wrap:wrap}.brand{font-size:20px}.site-header nav{gap:3px}.site-header .user{display:none}.layout{padding:24px 15px}.study-grid,.admin-grid{grid-template-columns:1fr}.page-heading h1{font-size:27px}.page-heading{align-items:flex-start}.page-heading>.badge{display:none}.catalog{order:2}.lesson-list{max-height:420px}.login-page{grid-template-columns:1fr}.login-art{padding:28px;min-height:260px}.login-art .big-type{font-size:37px;margin:25px 0 5px;letter-spacing:5px}.login-art p{display:none}.login-form-side{padding:35px 25px}.student-list{max-height:190px;overflow:auto}.panel-pad{padding:18px}.grant-row{padding:11px}.grant-row .tag{white-space:normal;max-width:65px}.course-editor{grid-template-columns:35px 1fr auto}.course-editor .small{grid-column:2/4}.player-info h2{font-size:18px}.login-art .footer{margin:0}.user-note{flex-wrap:wrap}.user-note input{width:100%}}

/* Keep the entry action visible inside the small-screen video placeholder. */
@media(max-width:760px){
  .video-stage .placeholder{padding:12px}
  .placeholder .ornament{display:none}
  .placeholder h2{font-size:20px;margin-bottom:8px}
  .placeholder p{font-size:11px;line-height:1.5;margin-bottom:10px}
  .placeholder button{padding:7px 12px;font-size:12px}
}

.filter-check{display:flex;align-items:center;gap:8px;margin:14px 0;line-height:1.6}
.admin-grid{grid-template-columns:300px minmax(0,1fr)}
.student-list{max-height:70vh;overflow:auto}
.student-item .student-overview-line{display:block;margin-top:5px;line-height:1.5;color:#596c5b;white-space:normal}
.student-item .student-recent{display:block;margin-top:8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#607169}
.brand{letter-spacing:1px}
.filter-check input{display:inline-block;width:16px;height:16px;margin:0;accent-color:var(--green)}
.course-settings{display:grid;gap:16px;max-width:720px;margin:20px 0}
.course-settings button{justify-self:start}
.editor-actions{display:flex;gap:5px;align-items:center}
.record summary{font-size:12px;color:var(--muted);cursor:pointer}
@media(max-width:760px){.editor-actions{grid-column:2/-1}.site-header nav{flex-wrap:wrap}.site-header nav button{padding:8px 10px}}
@media(max-width:760px){.site-header .brand{font-size:17px;gap:8px}.site-header .brand .badge{display:none}.login-art .brand{font-size:18px}}
@media(max-width:1000px){.admin-grid{grid-template-columns:260px minmax(0,1fr)}}
@media(max-width:760px){.admin-grid{grid-template-columns:1fr}.student-list{max-height:190px}}