:root{--bg-primary:#0B1D3A;--bg-secondary:#122A4F;--bg-card:#1A3562;--gold:#F0C04A;--gold2:#FFD977;--blue:#5DB0F5;--white:#fff;--paper:#F4F0E7;--cream:#FFF8E8;--ink:#10223d;--muted:#6a7890;--line:#dde5ee;--shadow:0 20px 60px rgba(10,30,60,.14)}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}html{background:var(--bg-primary)}body{margin:0;background:linear-gradient(180deg,var(--bg-primary) 0,#0f2648 360px,#f3f6f8 360px,#f3f6f8 100%);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.46;cursor:not-allowed}a{color:inherit;text-decoration:none}:focus-visible{outline:3px solid rgba(93,176,245,.55);outline-offset:3px}
.topbar{min-height:72px;padding:12px max(18px,calc((100vw - 1160px)/2));display:flex;align-items:center;justify-content:space-between;gap:18px;color:#fff;background:rgba(7,20,42,.5);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-logo{width:122px;height:auto;display:block}.brand em{font-style:normal;color:var(--gold);font-size:13px;font-weight:850;white-space:nowrap}.top-actions{display:flex;align-items:center;gap:18px;font-size:13px;color:rgba(255,255,255,.7)}.top-actions button{border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);color:#fff;border-radius:999px;padding:8px 12px}.top-actions a:hover,.top-actions button:hover{color:var(--gold);border-color:rgba(240,192,74,.38)}
main{max-width:1160px;margin:0 auto;padding:30px 20px 76px}.intro{position:relative;overflow:hidden;padding:34px 34px 30px;border-radius:28px;background:linear-gradient(135deg,rgba(26,53,98,.98),rgba(9,27,55,.98));color:#fff;margin-bottom:22px;box-shadow:var(--shadow);border:1px solid rgba(240,192,74,.18)}.intro:after{content:"";position:absolute;right:-95px;top:-120px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(240,192,74,.23),transparent 67%)}.intro-logo{position:relative;width:178px;height:auto;display:block;margin-bottom:20px}.eyebrow{position:relative;font-size:10px;letter-spacing:.18em;color:var(--gold);font-weight:900}.intro h1{position:relative;font-size:34px;line-height:1.22;letter-spacing:-.045em;margin:10px 0 22px}.steps{position:relative;display:flex;gap:10px;flex-wrap:wrap}.steps span{display:inline-flex;align-items:center;gap:9px;border:1px solid rgba(240,192,74,.24);background:rgba(255,255,255,.06);border-radius:999px;padding:9px 13px;font-size:13px;color:#e3edf8}.steps b{width:22px;height:22px;display:grid;place-items:center;background:var(--gold);color:var(--bg-primary);border-radius:50%;font-size:11px}.columns{display:grid;grid-template-columns:minmax(300px,360px) minmax(0,1fr);gap:20px;align-items:start}.panel{background:#fff;border:1px solid #e3e9ef;border-radius:24px;padding:24px;box-shadow:0 12px 34px rgba(16,36,65,.08)}.panel-head{display:flex;gap:13px;align-items:flex-start;margin-bottom:22px}.step-number{width:36px;height:36px;display:grid;place-items:center;flex:none;background:#fff0c9;color:#73510f;border-radius:12px;font-size:14px;font-weight:900}.panel-head h2{font-size:21px;line-height:1.3;margin:1px 0 5px;letter-spacing:-.02em}.panel-head p{font-size:12px;color:var(--muted);line-height:1.55;margin:0}.upload-panel>label:not(.file-drop){display:block;font-size:13px;font-weight:850;margin:20px 0 8px}.upload-panel input[type=text],.recut-panel select,.clip-adjust input,.login-card input{width:100%;height:46px;border:1px solid var(--line);border-radius:13px;background:#fff;padding:0 13px;color:var(--ink)}.file-drop{min-height:158px;border:2px dashed #b9c7d7;border-radius:18px;background:#f7fafc;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:8px;text-align:center;padding:20px;cursor:pointer;transition:.18s}.file-drop:hover{border-color:var(--blue);background:#eef7fe}.file-drop strong{font-size:16px}.file-drop span:last-child{font-size:12px;color:var(--muted);line-height:1.5;overflow-wrap:anywhere}.file-icon{width:44px;height:44px;border-radius:16px;display:grid;place-items:center;background:#fff0c9;color:#73510f;font-size:24px}.file-limit{font-size:12px;line-height:1.6;color:var(--muted);margin:12px 0 17px}.prepare-status{background:#f2f6f8;border-radius:14px;padding:13px;color:#587186;font-size:13px;line-height:1.65;margin:0}.prepare-status.busy{background:#fff5dc;color:#735921}.prepare-status.ready{background:#ecf8f1;color:#2f6b4e}.prepare-status.error{background:#fff1ed;color:#a14c3f}.empty-state{min-height:330px;border:1px dashed #d7e2ea;border-radius:18px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:24px;color:var(--muted)}.empty-icon{font-size:46px;color:#afc5d2;margin-bottom:9px}.empty-state strong{font-size:15px;color:#536b80}.empty-state p{font-size:13px;line-height:1.7;max-width:290px}.review-summary{display:flex;align-items:baseline;justify-content:space-between;gap:15px}.review-summary strong{font-size:23px;color:var(--bg-primary);letter-spacing:-.02em}.review-summary span{font-size:12px;color:var(--muted)}.review-guide{font-size:13px;line-height:1.75;color:#597084;margin:13px 0 16px}.primary{border:0;border-radius:14px;background:var(--gold);color:var(--bg-primary);font-weight:900;min-height:50px;padding:0 20px;box-shadow:0 10px 22px rgba(181,145,73,.24)}.primary:hover:not(:disabled){background:var(--gold2)}.manual-cut-panel{border:1px solid #dbe7ee;background:#f8fbfd;border-radius:18px;padding:14px;margin:12px 0 18px}.manual-main{display:grid;grid-template-columns:1fr 1.25fr;gap:10px}.manual-main button,.manual-actions button{border:1px solid #c8d9e5;background:#fff;color:#245675;border-radius:13px;min-height:44px;padding:0 12px;font-size:13px;font-weight:850}.manual-main button:hover:not(:disabled),.manual-actions button:hover:not(:disabled){background:#edf6fa}.manual-main .manual-mark{background:var(--gold);border-color:#dfb13c;color:var(--bg-primary);font-size:15px;box-shadow:0 8px 18px rgba(181,145,73,.22)}.manual-status{display:grid;gap:5px;margin:10px 0;color:#587085;font-size:12px;line-height:1.55}.manual-actions{display:flex;gap:8px;flex-wrap:wrap}.manual-actions button{min-height:36px;font-size:12px;background:#fdfefe}.publish-box{padding:16px;background:#fff8e7;border:1px solid #ecdcae;border-radius:18px;margin-bottom:20px}.publish{width:100%;font-size:16px}.publish-box p{font-size:12px;color:#816d49;margin:10px 0 0;line-height:1.55}.publish-box-bottom{margin-top:16px;margin-bottom:0;background:#eef8f3;border-color:#cfe7d9}.publish-box-bottom p{color:#47705d}.upload-status{font-size:12px;color:#586f85;line-height:1.6;margin-top:10px;overflow-wrap:anywhere}.upload-status a{color:#1c698e;text-decoration:underline}.preview-state{min-height:44px;padding:10px 13px;border:1px solid #dce6ec;background:#f7fafb;border-radius:14px;display:flex;justify-content:space-between;align-items:center;gap:12px;color:#587085;font-size:12px;margin-bottom:18px}.preview-state button{border:0;background:none;color:#1f6487;font-weight:850;white-space:nowrap}.recut-panel,.wave-details{border-top:1px solid #e4eaf0;padding-top:16px;margin-top:18px;font-size:13px;color:#395e79}.recut-panel>p{font-size:11px;color:var(--muted);line-height:1.5}.recut-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:14px}.recut-controls label{font-weight:850;font-size:12px}.recut-panel select{max-width:245px;height:38px;font-size:12px}.clip-actions button,.recut-panel button{border:1px solid #ccdce7;background:#f5f9fb;color:#315c78;border-radius:10px;min-height:36px;padding:5px 10px;font-size:12px;font-weight:800}.list-head{display:flex;justify-content:space-between;gap:12px;align-items:baseline;margin:20px 0 12px}.list-head h3{font-size:16px;margin:0}.list-head span{font-size:12px;color:var(--muted)}.clip-list{display:grid;gap:10px;max-height:610px;overflow-y:auto;padding:1px 3px 3px 1px}.clip-card{border:1px solid #e0e8ef;border-radius:16px;padding:15px;background:#fff;transition:.18s}.clip-card.playing{border-color:var(--gold);background:#fffbf1}.clip-main{display:flex;align-items:center;justify-content:space-between;gap:14px}.clip-title{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}.clip-title strong{font-size:15px}.clip-title span{font-size:12px;color:var(--muted)}.clip-play{border:1px solid #c7d8e5;background:#eef5f8;color:#1e5374;border-radius:11px;min-height:38px;padding:0 12px;font-size:12px;font-weight:850;white-space:nowrap}.clip-card.playing .clip-play{background:#fff0c8;border-color:#e8bf62;color:#604b25}.clip-fix{margin-top:12px;font-size:12px;color:#647b8f}.clip-fix summary,.recut-panel summary,.wave-details summary{cursor:pointer;user-select:none}.clip-actions{display:flex;gap:8px;flex-wrap:wrap;margin:13px 0 7px}.clip-actions .delete-button{color:#955e58;background:#fff8f5;border-color:#ead8d2}.clip-adjust{border-top:1px solid #e8edf1;padding-top:11px;display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:11px}.clip-adjust label{font-size:11px;color:#60758a}.clip-adjust input{display:block;height:36px;margin-top:5px;text-align:center;font-size:12px}.clip-adjust p{grid-column:1/-1;font-size:11px;color:var(--muted);margin:0}.wave-details canvas{display:block;width:100%;height:90px;border-radius:12px;margin-top:13px;background:var(--bg-primary)}.history-panel{margin-top:22px}.course-list{display:grid;gap:9px}.course-item{background:#f8fafb;border:1px solid #e8eef2;border-radius:14px;padding:14px 15px;display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px}.course-item strong{font-size:14px}.course-item small{display:block;color:var(--muted);margin-top:4px}.course-item a{color:#206c90;font-weight:850;white-space:nowrap}.badge{font-size:11px;border-radius:8px;padding:5px 8px;background:#e4f3e9;color:#317149}.badge.draft{background:#fbefd4;color:#90682b}.muted{color:var(--muted);font-size:13px}.login-panel{min-height:calc(100vh - 170px);display:grid;place-items:center}.login-card{width:min(420px,100%);background:#fff;border-radius:24px;padding:34px;box-shadow:var(--shadow)}.login-card h1{font-size:28px;margin:13px 0 7px}.login-card p{font-size:13px;line-height:1.7;color:var(--muted)}.login-card label{display:block;font-size:13px;font-weight:850;margin:24px 0 8px}.login-card .primary{width:100%;margin-top:18px}.login-card .error{color:#b94b46;min-height:19px}.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%) translateY(20px);background:var(--gold);color:var(--bg-primary);padding:11px 17px;border-radius:12px;font-size:13px;font-weight:850;opacity:0;transition:.2s;pointer-events:none;max-width:90vw;z-index:30}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}.sticky-publish{position:sticky;bottom:0;z-index:15;margin:18px -24px -24px;padding:12px 24px calc(12px + env(safe-area-inset-bottom));background:rgba(255,255,255,.97);border-top:1px solid #dfe6ee;box-shadow:0 -10px 30px rgba(11,29,58,.12);display:flex;align-items:center;gap:12px}.sticky-publish .primary{min-width:210px;flex:1}.sticky-publish span{font-size:12px;color:var(--muted);white-space:nowrap}
@media(max-width:820px){body{background:linear-gradient(180deg,var(--bg-primary) 0,#0f2648 330px,#f3f6f8 330px,#f3f6f8 100%)}main{padding:22px 15px 108px}.columns{grid-template-columns:1fr}.intro{padding:28px 22px 25px}.intro-logo{width:156px}.clip-list{max-height:none}.sticky-publish{position:fixed;left:0;right:0;margin:0;padding:10px 15px calc(10px + env(safe-area-inset-bottom))}.sticky-publish .primary{width:100%;min-height:52px;font-size:16px}.sticky-publish span{display:none}}@media(max-width:520px){.topbar{min-height:64px;padding:10px 15px}.brand-logo{width:104px}.brand em{font-size:12px}.top-actions{font-size:11px;gap:9px}.top-actions a{display:none}.intro h1{font-size:28px}.steps{gap:7px}.steps span{font-size:11px;padding:8px 10px}.panel{padding:18px;border-radius:20px}.panel-head h2{font-size:18px}.manual-main{grid-template-columns:1fr}.manual-main .manual-mark{min-height:54px;font-size:16px}.review-summary strong{font-size:20px}.clip-main{align-items:flex-start}.clip-title{display:block}.clip-title span{display:block;margin-top:4px}.clip-play{padding:0 8px}.course-item{align-items:flex-start;flex-direction:column}.clip-adjust{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* 2026-09-16: align teacher workspace with the original JPC blue-green logo palette */
:root{--bg-primary:#0088C8;--bg-secondary:#0A9BD8;--bg-card:#E8F7FD;--gold:#68B828;--gold2:#78C93A;--green:#68B828;--green2:#78C93A;--blue:#0088C8;--white:#fff;--paper:#F7FAFB;--cream:#F2FAED;--ink:#202124;--muted:#65717D;--line:#E4EEF2;--shadow:0 18px 52px rgba(0,136,200,.14)}
html{background:var(--paper)}body{background:radial-gradient(circle at 12% 0%,rgba(104,184,40,.14),transparent 34%),radial-gradient(circle at 88% 4%,rgba(0,136,200,.14),transparent 36%),linear-gradient(180deg,#fff 0%,#f7fbfd 100%)}:focus-visible{outline-color:rgba(0,136,200,.45)}
.topbar{color:var(--ink);background:rgba(255,255,255,.86);border-bottom:1px solid var(--line);box-shadow:0 10px 34px rgba(0,136,200,.08)}.brand em{color:var(--blue)}.top-actions{color:#66717c}.top-actions button{border:1px solid rgba(0,136,200,.18);background:#fff;color:var(--blue)}.top-actions a:hover,.top-actions button:hover{color:var(--green);border-color:rgba(104,184,40,.35);background:#f6fcf2}
.intro{background:linear-gradient(135deg,#fff 0%,#f7fcff 56%,#f2faed 100%);color:var(--ink);border:1px solid var(--line);box-shadow:var(--shadow)}.intro:before{content:"";position:absolute;left:0;top:0;right:0;height:8px;background:linear-gradient(90deg,var(--gold),var(--blue))}.intro:after{background:radial-gradient(circle,rgba(0,136,200,.14),rgba(104,184,40,.12) 44%,transparent 70%)}.intro-logo{width:210px}.eyebrow{color:var(--blue)}.intro h1{color:var(--ink)}.steps span{border:1px solid rgba(0,136,200,.16);background:#fff;color:#304256;box-shadow:0 8px 20px rgba(0,136,200,.06)}.steps span:nth-child(2){border-color:rgba(104,184,40,.25)}.steps b,.step-number{background:linear-gradient(135deg,#EAF8E4,#E8F7FD);color:var(--blue);border:1px solid rgba(0,136,200,.12)}
.panel{border-color:var(--line);box-shadow:0 14px 38px rgba(0,136,200,.08)}.panel-head h2,.review-summary strong,.clip-title strong,.course-item strong,.login-card h1{color:var(--ink)}.upload-panel input[type=text],.recut-panel select,.clip-adjust input,.login-card input{border-color:#dbe8ee}.upload-panel input[type=text]:focus,.recut-panel select:focus,.clip-adjust input:focus,.login-card input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,136,200,.1);outline:0}.file-drop{border-color:#c7e2ee;background:#fbfdff}.file-drop:hover{border-color:var(--blue);background:#f0faff}.file-icon{background:linear-gradient(135deg,#EAF8E4,#E8F7FD);color:var(--blue)}.prepare-status.busy{background:#eef8e8;color:#477329}.prepare-status.ready{background:#edf8f2;color:#2f7048}.prepare-status.error{background:#fff1ed;color:#a14c3f}.empty-icon{color:var(--blue)}
.primary{background:linear-gradient(135deg,var(--blue),#0A9BD8);color:#fff;box-shadow:0 12px 26px rgba(0,136,200,.22)}.primary:hover:not(:disabled){background:linear-gradient(135deg,#087FBA,var(--blue));color:#fff}.manual-cut-panel{border-color:#dbeaf0;background:#fbfdff}.manual-main button,.manual-actions button{border-color:#cce3ed;color:#245d79;background:#fff}.manual-main button:hover:not(:disabled),.manual-actions button:hover:not(:disabled){background:#f0faff}.manual-main .manual-mark{background:linear-gradient(135deg,var(--green),#78C93A);border-color:rgba(104,184,40,.55);color:#fff;box-shadow:0 10px 22px rgba(104,184,40,.2)}
.publish-box{background:#f0faff;border-color:#cfeaf4}.publish-box p{color:#4f7180}.publish-box-bottom{background:#f3fbef;border-color:#d4ebc8}.publish-box-bottom p{color:#4e7441}.upload-status a,.course-item a,.preview-state button{color:var(--blue)}.preview-state{border-color:#dcebf1;background:#fbfdff}.clip-actions button,.recut-panel button{border-color:#cce3ed;background:#f7fcff;color:#245d79}.clip-card.playing{border-color:var(--blue);background:#f5fbff}.clip-card.playing .clip-play{background:#eef8e8;border-color:#cce8c0;color:#3f7431}.clip-play{border-color:#cce3ed;background:#f0faff;color:#245d79}.clip-actions .delete-button{color:#8f5954;background:#fff7f5;border-color:#ead8d2}.wave-details canvas{background:#0b334d}.course-item{background:#fbfdff;border-color:var(--line)}.badge{background:#e9f7e3;color:#3f7431}.badge.draft{background:#e8f7fd;color:#1f6c91}.login-card{box-shadow:var(--shadow);border:1px solid var(--line)}.toast{background:var(--blue);color:#fff}.sticky-publish{background:rgba(255,255,255,.97);border-top-color:var(--line)}
@media(max-width:760px){.topbar{background:rgba(255,255,255,.94)}.brand-logo{max-width:138px}.intro-logo{width:190px}}

.course-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}.course-delete{border:1px solid #ead8d2;background:#fff7f5;color:#9a4f48;border-radius:10px;min-height:34px;padding:6px 11px;font-size:12px;font-weight:850}.course-delete:hover:not(:disabled){background:#fff0ec;border-color:#e2c7be}.course-delete:disabled{opacity:.55}
@media(max-width:520px){.course-actions{width:100%;justify-content:space-between}.course-delete{min-width:82px}}

/* Mobile hardening: WeChat, iOS Safari, narrow Android screens */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{overflow-x:hidden}button,a,label,summary{touch-action:manipulation}.topbar,.columns,.panel,.intro,.clip-card,.course-item{min-width:0}.upload-panel input[type=text],.recut-panel select,.clip-adjust input,.login-card input{font-size:16px}.manual-main button,.manual-actions button,.clip-actions button,.recut-panel button,.clip-play,.course-delete,.course-password,.course-publish-class,.course-unpublish-class,.top-actions button{min-height:44px}.file-drop{min-height:150px}.file-drop strong,.file-drop span{max-width:100%;overflow-wrap:anywhere}.review-summary,.clip-main,.preview-state,.course-item{min-width:0}.review-summary span,.clip-title span,.course-item small{overflow-wrap:anywhere}.wave-details canvas{max-width:100%}.sticky-publish{padding-left:max(15px,env(safe-area-inset-left));padding-right:max(15px,env(safe-area-inset-right))}@supports(height:100svh){body{min-height:100svh}}@media(max-width:820px){main{padding-left:max(14px,env(safe-area-inset-left));padding-right:max(14px,env(safe-area-inset-right))}.topbar{padding-left:max(14px,env(safe-area-inset-left));padding-right:max(14px,env(safe-area-inset-right))}.intro h1{font-size:31px}.manual-main{grid-template-columns:1fr}.manual-main .manual-mark{min-height:56px}.manual-actions button{flex:1 1 120px}.recut-controls{display:grid;grid-template-columns:1fr}.recut-panel select{max-width:none}.clip-actions button{flex:1 1 120px}.clip-list{overflow:visible}.sticky-publish{position:fixed;bottom:0;left:0;right:0}}@media(max-width:430px){main{padding:18px 12px 112px}.topbar{min-height:62px;padding-top:8px;padding-bottom:8px}.brand-logo{width:118px}.brand em{font-size:11px}.top-actions button{padding:7px 10px}.intro{padding:26px 19px 23px;border-radius:24px}.intro-logo{width:176px}.intro h1{font-size:27px}.steps span{font-size:11px;padding:8px 9px}.panel{padding:17px;border-radius:20px}.panel-head{gap:10px}.step-number{width:34px;height:34px}.panel-head h2{font-size:18px}.review-summary{display:block}.review-summary strong{display:block;margin-bottom:5px}.manual-cut-panel{padding:12px}.manual-actions{display:grid;grid-template-columns:1fr}.publish-box{padding:14px}.preview-state{display:block}.preview-state button{margin-top:8px;min-height:34px}.clip-card{padding:14px}.clip-main{display:block}.clip-play{width:100%;margin-top:10px}.clip-adjust{grid-template-columns:1fr}.course-item{display:block}.course-actions{margin-top:10px;justify-content:space-between}.course-actions a,.course-delete{min-height:38px}.login-panel{min-height:calc(100svh - 90px)}.login-card{padding:28px 22px;border-radius:22px}.sticky-publish .primary{min-height:54px}}@media(max-width:360px){main{padding-left:10px;padding-right:10px}.brand-logo{width:104px}.intro{padding:23px 16px 21px}.intro-logo{width:154px}.intro h1{font-size:24px}.steps{display:grid}.steps span{width:100%}.panel{padding:15px}.file-drop{min-height:136px}.manual-status{font-size:11px}.publish{font-size:14px}.clip-title strong{font-size:14px}.top-actions button{font-size:11px}.login-card{padding:24px 18px}}@media(orientation:landscape) and (max-height:520px){.intro{padding-top:22px;padding-bottom:21px}.intro h1{font-size:25px}.steps span{padding:7px 10px}.file-drop{min-height:120px}.sticky-publish .primary{min-height:48px}}


/* Mobile upload fix: keep a real file input tappable in WeChat/iOS/Android */
.file-picker{position:relative}.file-picker .file-drop{cursor:default}.source-file-input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.source-picker-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.choose-file-button{display:block;width:100%;margin:10px 0 0;border:1px solid rgba(0,136,200,.22);background:#fff;color:var(--blue);border-radius:14px;min-height:48px;padding:8px 12px;font-weight:900}.choose-file-button:hover:not(:disabled),.choose-file-button:focus-visible{border-color:var(--blue);background:#f0faff;outline:none}.source-picker-actions .choose-file-button:last-child{color:#337d2d;border-color:rgba(90,190,42,.3)}@media(max-width:430px){.source-picker-actions{grid-template-columns:1fr}.file-drop{min-height:144px}}

.course-password-line{color:var(--blue)!important;font-weight:850}.course-password{border:1px solid #cce3ed;background:#f7fcff;color:#245d79;border-radius:10px;min-height:34px;padding:6px 11px;font-size:12px;font-weight:850}.course-password:hover:not(:disabled){background:#eef8fc;border-color:var(--blue)}

.stats-panel{margin-bottom:22px}.practice-stats{display:grid;gap:14px}.stats-total{padding:18px;border-radius:18px;background:linear-gradient(135deg,#f0faff,#f3fbef);border:1px solid var(--line)}.stats-total strong{display:block;font-size:30px;letter-spacing:-.04em;color:var(--blue)}.stats-total span{font-size:12px;color:var(--muted);font-weight:850}.stats-total span small{display:block;margin-top:5px;font-size:11px;line-height:1.55;color:#73808c;font-weight:650}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.stats-grid>div{border:1px solid var(--line);border-radius:16px;padding:14px;background:#fbfdff}.stats-grid h3{font-size:15px;margin:0 0 10px;color:var(--ink)}.stats-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 0;border-top:1px solid #edf2f5}.stats-row:first-of-type{border-top:0}.stats-row span{font-size:13px;font-weight:850;color:var(--ink);min-width:0}.stats-row small{display:block;margin-top:3px;font-size:11px;color:var(--muted);font-weight:500}.stats-row strong{font-size:12px;color:var(--blue);white-space:nowrap}.course-class-line{color:#4c7b42!important;font-weight:850}@media(max-width:700px){.stats-grid{grid-template-columns:1fr}.stats-total strong{font-size:24px}}

.teacher-class-panel{margin-bottom:22px}.teacher-class-picker{display:grid;gap:12px}.teacher-class-codes{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.teacher-class-codes button{border:1px solid rgba(0,136,200,.18);border-radius:14px;background:#fff;color:#315368;font-weight:900;min-height:44px}.teacher-class-codes button.active{background:linear-gradient(135deg,var(--blue),#0A9BD8);border-color:var(--blue);color:#fff;box-shadow:0 10px 22px rgba(0,136,200,.18)}.teacher-class-picker label{font-size:12px;font-weight:850;color:#526172}.teacher-class-save-row{display:grid;grid-template-columns:1fr auto;gap:10px}.teacher-class-save-row input{width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);padding:0 13px;min-height:48px;font-size:16px}.teacher-class-current{margin:0;color:#304256;font-size:13px;font-weight:850;line-height:1.65}@media(max-width:520px){.teacher-class-save-row{grid-template-columns:1fr}.teacher-class-save-row .primary{width:100%}}

.course-publish-class,.course-unpublish-class{border:1px solid #cfe8c4;background:#f7fff3;color:#3f7431;border-radius:10px;min-height:34px;padding:6px 11px;font-size:12px;font-weight:850}.course-publish-class:hover:not(:disabled){background:#eefbe7;border-color:var(--green)}.course-unpublish-class{border-color:#ead8d2;background:#fff7f5;color:#9a4f48}.course-unpublish-class:hover:not(:disabled){background:#fff0ec;border-color:#e2c7be}

.course-level-readonly{color:#4c7b42!important;font-weight:850}


/* Keep unified-entry link visible on teacher mobile pages */
.top-actions .entry-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 13px;border:1px solid rgba(0,136,200,.18);border-radius:999px;background:#fff;color:var(--blue);font-weight:900;white-space:nowrap;box-shadow:0 6px 18px rgba(0,136,200,.06)}
.top-actions .entry-link:active{transform:scale(.98);background:#f0faff}
@media(max-width:520px){.top-actions .entry-link{display:inline-flex!important;font-size:11px;min-height:38px;padding:0 10px}.top-actions{gap:7px;flex-shrink:0}.brand{flex:1 1 auto}.brand-logo{width:104px}}
@media(max-width:360px){.top-actions .entry-link{font-size:10px;padding:0 8px}.brand em{display:none}}


/* Mobile quick navigation: keeps teacher pages usable without adding desktop clutter */
.mobile-bottom-nav{display:none}
@media(max-width:820px){main{padding-bottom:176px}.mobile-bottom-nav{position:fixed;left:50%;bottom:calc(10px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:45;width:min(390px,calc(100vw - 24px));display:grid;grid-template-columns:repeat(4,1fr);gap:5px;padding:8px;border:1px solid rgba(0,136,200,.16);border-radius:24px;background:rgba(255,255,255,.94);box-shadow:0 16px 40px rgba(0,136,200,.16);backdrop-filter:blur(14px)}.mobile-bottom-nav a{min-height:48px;border-radius:17px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:3px;color:#526171;font-size:11px;font-weight:900}.mobile-bottom-nav a:active{background:#f0faff;transform:scale(.98)}.mobile-bottom-nav span{font-size:14px;line-height:1;color:var(--blue);font-weight:950}.mobile-bottom-nav strong{font-size:11px;line-height:1}.sticky-publish{bottom:calc(80px + env(safe-area-inset-bottom))}}
@media(max-width:360px){.mobile-bottom-nav{width:calc(100vw - 18px);padding:7px}.mobile-bottom-nav a{min-height:44px}.mobile-bottom-nav strong{font-size:10px}}

.course-item.class-manager-open{flex-wrap:wrap}.course-manage-classes{border:1px solid #C7DDE8;background:#F0FAFF;color:#0088C8;border-radius:10px;padding:9px 11px;min-height:38px;font-size:12px;font-weight:850}.class-manager{width:100%;min-width:0;flex-basis:100%;border-top:1px solid var(--line);margin-top:12px;padding-top:14px}.class-manager h3{font-size:15px;margin:0 0 8px}.class-manager .hint{font-size:12px;margin:0 0 10px;line-height:1.6}.class-manager-tags{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.class-manager-tag,.class-manager-add button,.class-manager-footer button{min-height:44px;padding:9px 12px;border:1px solid #C7DDE8;border-radius:12px;background:#F0FAFF;color:#245675;font-size:13px;font-weight:800}.class-manager-add{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.class-manager-add label{font-size:13px;font-weight:850;color:#315368}.class-manager-add input{flex:1;min-width:80px;width:0;max-width:180px;height:44px;padding:0 12px;border:1px solid var(--line);border-radius:12px;background:#FFF;color:var(--ink);font-size:16px}.class-manager-error{font-size:12px;color:#A14C3F;line-height:1.6;margin:8px 0}.class-manager-footer{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.class-manager-footer .class-manager-save{background:#0088C8;color:#FFF;border-color:#0088C8}.class-manager-footer .class-manager-cancel{background:#FFF}.class-manager button:disabled{opacity:.55;cursor:default}@media(max-width:430px){.course-manage-classes{min-height:44px}.class-manager-add input{max-width:none}.class-manager-footer button{flex:1}}
/* Class ranking export stays on its own row on narrow screens. */
.stats-tools{display:flex;justify-content:flex-end;margin:0 0 14px;gap:10px}
.stats-tools button{min-height:44px;padding:10px 14px;border:1px solid #CCE3ED;border-radius:12px;background:#F7FCFF;color:#245D79;font-size:13px;font-weight:800;white-space:normal}
.stats-tools button:disabled{opacity:.5;cursor:default}
@media(max-width:480px){.stats-tools button{width:100%;margin:0}}

.stats-period-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:0 0 12px;padding:5px;border:1px solid #DCE8EF;border-radius:16px;background:#F7FAFC}
.stats-period-tabs button{min-height:42px;border:0;border-radius:12px;background:transparent;color:#526172;font-size:13px;font-weight:850}
.stats-period-tabs button.active{background:linear-gradient(135deg,#0088C8,#0A9BD8);color:#FFF;box-shadow:0 8px 18px rgba(0,136,200,.18)}
.stats-analysis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.stats-analysis-card{min-width:0;padding:13px;border:1px solid #E0EBF0;border-radius:14px;background:#FBFDFF}
.stats-analysis-card>span{display:block;color:#65717D;font-size:11px;font-weight:800}
.stats-analysis-card>strong{display:block;margin-top:6px;color:#202124;font-size:15px;line-height:1.35;overflow-wrap:anywhere}
.stats-analysis-card>small{display:block;margin-top:4px;color:#65717D;font-size:10px;line-height:1.4;overflow-wrap:anywhere}
.stats-ranking{margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:16px;background:#FBFDFF}
.stats-ranking h3{font-size:15px;margin:0 0 10px;color:var(--ink)}
.stats-note{margin:10px 0 0;padding:10px 12px;border-radius:12px;background:#F3F8FA;color:#5E6F7E;font-size:11px;line-height:1.65}
@media(max-width:700px){.stats-analysis{grid-template-columns:repeat(2,minmax(0,1fr))}.stats-period-tabs button{font-size:12px}.stats-ranking{padding:12px}}
@media(max-width:360px){.stats-analysis{grid-template-columns:1fr}.stats-analysis-card>strong{font-size:14px}}

.stats-row-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex:none}.stats-row-actions strong{min-width:94px;text-align:right}.stats-delete-student{min-height:34px;padding:6px 10px;border:1px solid #EAD8D2;border-radius:10px;background:#FFF7F5;color:#9A4F48;font-size:11px;font-weight:850;white-space:nowrap}.stats-delete-student:hover:not(:disabled){background:#FFF0EC;border-color:#D9BEB7}.stats-delete-student:disabled{opacity:.5}@media(max-width:520px){.stats-row{align-items:flex-start}.stats-row-actions{display:grid;justify-items:end;gap:6px}.stats-row-actions strong{min-width:0}.stats-delete-student{min-height:32px;padding:5px 9px}}

/* One course-save action per viewport; keep mobile source guidance compact. */
.sticky-publish{display:none}
.wechat-upload-help{display:none;margin:9px 0 0;padding:9px 12px;border-radius:12px;background:#F7FCFF;color:#526172;font-size:12px;line-height:1.65}
@media(max-width:820px){.publish-box-bottom{display:none}.sticky-publish{display:flex}.wechat-upload-help{display:block}}
/* Seven stages: keep the original four together and place BEC/BEC Pro/BTC evenly below. */
.teacher-class-codes{grid-template-columns:repeat(12,minmax(0,1fr))}
.teacher-class-codes button{grid-column:span 3;min-width:0}
.teacher-class-codes button:nth-child(n+5){grid-column:span 4}
.direct-clips-panel{margin-top:18px;padding:16px;border:1px solid #cfe5ee;border-radius:16px;background:#f7fcff}.direct-clips-panel>strong{display:block;font-size:14px;color:var(--ink);margin-bottom:7px}.direct-clips-panel>p{font-size:12px;line-height:1.65;color:var(--muted);margin:0 0 12px}.direct-clips-panel .choose-file-button{display:block}.direct-clips-input{display:none}.direct-clips-preview{margin:12px 0;padding:10px 12px;border-radius:12px;background:#fff;border:1px solid var(--line);max-height:190px;overflow:auto}.direct-clips-preview strong{display:block;font-size:12px;color:var(--ink);margin-bottom:7px}.direct-clips-preview ol{margin:0;padding-left:24px}.direct-clips-preview li{font-size:12px;line-height:1.7;color:#526f80;overflow-wrap:anywhere}.direct-clips-upload{width:100%;min-height:46px;margin-top:10px}

/* Teacher clip preview: visible timing and direct seeking within the selected clip. */
.preview-state{display:block}
.preview-state-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.clip-preview-progress{width:100%;margin-top:12px;padding-top:10px;border-top:1px solid #E2EDF2}
.clip-preview-time{display:flex;justify-content:space-between;gap:12px;margin-bottom:5px;color:#526F80;font-size:11px;font-variant-numeric:tabular-nums}
.clip-preview-progress input[type=range]{display:block;width:100%;margin:0;accent-color:var(--blue);cursor:pointer}
@media(max-width:520px){.preview-state-head{align-items:flex-start}.preview-state-head #preview-status{line-height:1.55}.preview-state-head #stop-preview{flex:none;margin-top:0!important}}
.clip-main-actions{display:flex;align-items:center;gap:8px;flex:none}.clip-delete-quick{border:1px solid #EAD8D2;background:#FFF7F5;color:#9A4F48;border-radius:11px;min-height:38px;padding:0 12px;font-size:12px;font-weight:850;white-space:nowrap}.clip-delete-quick:hover:not(:disabled){background:#FFF0EC;border-color:#D9BEB7}.clip-delete-quick:disabled{opacity:.45;cursor:default}@media(max-width:520px){.clip-main-actions{display:grid;grid-template-columns:1fr auto;width:100%;margin-top:10px}.clip-main-actions .clip-play{margin:0!important}.clip-delete-quick{min-height:44px}}
.clip-adjust-toggle{display:block;width:100%;min-height:44px;margin-top:10px;padding:10px 12px;border:1px solid #D7E7EE;border-radius:11px;background:#F8FCFE;color:#315F78;text-align:left;font-size:12px;font-weight:800;cursor:pointer;touch-action:manipulation}.clip-adjust-toggle:hover{background:#EFF9FD}.clip-adjust-toggle:focus-visible{outline:3px solid rgba(0,136,200,.22);outline-offset:2px}.clip-fix[hidden]{display:none!important}.clip-fix{margin-top:8px;padding:12px;border:1px solid #E4EDF1;border-radius:12px;background:#FCFEFF}@media(max-width:520px){.clip-adjust-toggle{font-size:13px;min-height:48px}.clip-fix{padding:11px}}
.clip-save-adjust{grid-column:1/-1;min-height:44px;border:0;border-radius:11px;background:#0088C8;color:#fff;font-size:12px;font-weight:850;touch-action:manipulation}.clip-save-adjust:hover{background:#0076AD}@media(max-width:520px){.clip-save-adjust{font-size:13px;min-height:48px}}
.manual-progress{width:100%;margin:8px 0 12px;padding:10px 12px;border:1px solid #DCEBF1;border-radius:12px;background:#fff}.manual-progress-time{display:flex;justify-content:space-between;gap:12px;margin-bottom:6px;color:#526F80;font-size:11px;font-variant-numeric:tabular-nums}.manual-progress input[type=range]{display:block;width:100%;height:24px;margin:0;accent-color:var(--blue);cursor:pointer;touch-action:pan-x}.manual-progress input[type=range]:disabled{cursor:default;opacity:.45}@media(max-width:520px){.manual-progress{padding:11px 12px;margin:9px 0 13px}.manual-progress input[type=range]{height:32px}.manual-progress-time{font-size:12px}}
.course-release-control{display:flex;align-items:center;gap:7px;min-height:40px;padding:5px 8px;border:1px solid #D5E7EE;border-radius:10px;background:#F7FCFE;color:#526F80;font-size:11px}.course-release-control span{white-space:nowrap}.course-release-select{min-height:32px;border:1px solid #C9DDE6;border-radius:8px;background:#fff;color:#245675;padding:0 28px 0 8px;font-size:12px;font-weight:800}.course-save-limit{border:1px solid #96CFE2;background:#EAF8FC;color:#176789;border-radius:10px;min-height:40px;padding:0 11px;font-size:12px;font-weight:850}@media(max-width:520px){.course-release-control{width:100%;justify-content:space-between;min-height:46px}.course-release-select{flex:1;min-height:38px}.course-save-limit{width:100%;min-height:46px}}
.course-sentence-preview{width:100%;border:1px solid #D8E8EE;border-radius:12px;background:#FBFEFF;overflow:hidden}.course-sentence-preview>summary{cursor:pointer;padding:11px 13px;color:#087FAF;font-size:12px;font-weight:850;list-style-position:inside}.course-sentence-preview[open]>summary{border-bottom:1px solid #E3EEF2}.course-sentence-preview-body{padding:10px}.release-selection-hint{margin:0 0 9px;color:#526F80;font-size:11px;line-height:1.55}.release-sentence-list{display:grid;gap:6px;max-height:320px;overflow:auto;padding-right:2px}.release-sentence-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:7px;align-items:center;padding:6px;border:1px solid #E2EBEF;border-radius:9px;background:#fff}.release-sentence-row.included{border-color:#BFE1B1;background:#F7FFF3}.release-sentence-row.cutoff{border-color:#66B847;box-shadow:0 0 0 1px rgba(102,184,71,.12)}.release-sentence-play,.release-sentence-cutoff{min-height:36px;border-radius:8px;font-size:11px;font-weight:800}.release-sentence-play{text-align:left;border:0;background:transparent;color:#245675;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.release-sentence-play.playing{background:#EAF7FC;color:#007EB8}.release-sentence-cutoff{border:1px solid #C7DEE7;background:#fff;color:#397186;padding:0 10px}.release-sentence-row.cutoff .release-sentence-cutoff{border-color:#73BF58;background:#EAF8E5;color:#397B27}@media(max-width:520px){.course-sentence-preview>summary{padding:14px;font-size:13px}.release-sentence-row{grid-template-columns:1fr}.release-sentence-play,.release-sentence-cutoff{min-height:42px;font-size:12px}.release-sentence-cutoff{width:100%}.release-sentence-list{max-height:420px}}

/* Keep the teacher focused on the active class; reveal the level library only when adding. */
.class-course-overview,.course-library-head{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:15px 16px;border:1px solid #D9E8EE;border-radius:16px;background:linear-gradient(135deg,#F7FCFF,#F5FCEF)}
.class-course-overview h3,.course-library-head h3{margin:0;color:var(--ink);font-size:17px}.class-course-overview p,.course-library-head p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.55}.course-library-toggle{flex:none;min-height:44px;padding:10px 15px;border:0;border-radius:12px;background:linear-gradient(135deg,var(--green),var(--blue));color:#fff;font-size:13px;font-weight:900;box-shadow:0 8px 20px rgba(0,136,200,.15)}.course-library-head{margin-top:8px;background:#F7FAFC}.course-library-head>span{flex:none;color:#087FAF;font-size:12px;font-weight:850}.course-group{display:grid;gap:12px}.course-group-empty{margin:0;padding:24px 16px;border:1px dashed #CFE0E7;border-radius:14px;background:#FBFDFE;color:#64727E;font-size:13px;text-align:center}.course-library-list{padding-top:2px}.course-library-line{color:#28733A!important;font-weight:850}@media(max-width:520px){.class-course-overview,.course-library-head{align-items:stretch;flex-direction:column;padding:14px}.course-library-toggle{width:100%}.course-library-head>span{align-self:flex-start}.class-course-overview h3,.course-library-head h3{font-size:15px}}

/* Mobile teacher workflow: active class and its courses first; course production last. */
@media(max-width:820px){
  #workspace:not([hidden]){display:flex;flex-direction:column}
  #workspace>.teacher-class-panel{order:1}
  #workspace>#history-panel{order:2;margin-bottom:22px}
  #workspace>.stats-panel{order:3}
  #workspace>.intro{order:4;margin-top:0}
  #workspace>.columns{order:5}
  #workspace>#sticky-publish{order:6}
}
@media(max-width:430px){
  #workspace>.intro{padding:18px 17px;border-radius:20px}
  #workspace>.intro .intro-logo{display:none}
  #workspace>.intro .eyebrow{font-size:9px}
  #workspace>.intro h1{font-size:19px;line-height:1.35;margin:7px 0 0}
  #workspace>#history-panel{margin-bottom:22px}
}