:root{--bg:#f7f7fb;--paper:#fff;--ink:#252535;--muted:#9493a5;--primary:#7052ef;--soft:#eeebff;--line:#eeeef4;--radius:22px;--nav:76px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-tap-highlight-color:transparent}button,input,select{font:inherit}button{border:0;cursor:pointer;background:none;color:inherit;touch-action:manipulation}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #b4a4ff;outline-offset:3px}button,select,input{min-height:44px}svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}h1,h2,h3,p{margin:0}h1{font-size:28px;letter-spacing:-1px;line-height:1.35}h2{font-size:20px}h3{font-size:16px}small{font-size:12px;color:var(--muted)}.app{max-width:1160px;margin:auto;min-height:100dvh}.header{height:82px;display:flex;align-items:center;justify-content:space-between;padding:16px 24px}.brand{display:flex;gap:10px;align-items:center;font-size:19px;font-weight:800}.brand-mark{background:var(--primary);color:white;border-radius:13px;width:39px;height:39px;display:grid;place-items:center;transform:rotate(-5deg)}.brand-mark svg{width:25px}.header-actions{display:flex;gap:10px;align-items:center}.demo{font-size:11px;color:#9995ad}.coach{width:38px;height:38px;border-radius:50%;background:#e6e1fa;color:#6d55be;font-weight:700;display:grid;place-items:center}.coach.admin{background:var(--primary);color:#fff}.content{padding:10px 24px 200px}.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.intro p{color:var(--muted);margin-top:7px;font-size:13px}.date{font-size:12px;color:var(--muted);text-align:right}.primary{background:var(--primary);color:white;border-radius:15px;font-size:15px;font-weight:650;padding:13px 20px;display:inline-flex;gap:8px;align-items:center;justify-content:center;min-height:52px}.secondary{background:var(--soft);color:var(--primary);border-radius:13px;padding:10px 15px;font-weight:600}.icon-btn{width:44px;height:44px;display:inline-grid;place-items:center;border-radius:50%;flex-shrink:0}.icon-btn:hover{background:var(--soft);color:var(--primary)}.training-banner{background:var(--primary);color:white;display:flex;align-items:center;justify-content:space-between;padding:24px;border-radius:var(--radius);margin-bottom:28px;overflow:hidden;position:relative}.training-banner h2{font-size:23px;margin-bottom:5px}.training-banner p{font-size:13px;color:#dfd7ff}.training-banner button{background:white;color:var(--primary);padding:0 17px;border-radius:13px;font-size:14px;font-weight:700;flex-shrink:0;margin-left:10px}.banner-icon{position:absolute;right:145px;opacity:.12;transform:rotate(-18deg);width:105px;height:105px}.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;gap:12px}.section-title{display:flex;align-items:center;gap:9px}.count{background:#eae8f1;border-radius:7px;padding:1px 7px;font-size:11px;color:#868293}.search{display:flex;background:#efeff5;border-radius:14px;padding:0 13px;gap:8px;align-items:center;margin-bottom:16px;color:var(--muted)}.search input{width:100%;background:none;border:none;outline:none;padding:12px 0;color:var(--ink);min-width:0;font-size:14px}.search input::placeholder{color:#a4a1b2}.chips{display:flex;gap:9px;overflow:auto;scrollbar-width:none;margin:0 0 20px;padding-bottom:2px}.chip{white-space:nowrap;background:white;border-radius:10px;min-height:38px;padding:6px 15px;font-size:13px;color:#8a879c}.chip.active{background:var(--soft);color:var(--primary);font-weight:650}.students{background:white;border-radius:var(--radius);padding:3px 17px}.student{display:flex;gap:12px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line);min-width:0}.student:last-child{border-bottom:0}.avatar{display:grid;place-items:center;border-radius:17px;width:51px;height:51px;flex-shrink:0;font-size:21px;font-weight:650;color:#7563a8;background:#ede6fb}.avatar.peach{background:#ffede0;color:#c58e6d}.avatar.mint{background:#e2f3ed;color:#65a18b}.avatar.blue{background:#e4edfe;color:#7a9bce}.avatar.yellow{background:#fff2d5;color:#b99b57}.student-info{flex:1;min-width:0}.name-line{display:flex;align-items:center;gap:9px}.student h3{font-size:16px;font-weight:650}.student-info p{font-size:12px;color:var(--muted);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-info p svg{width:12px;height:12px;vertical-align:-2px;margin-right:4px}.class-label{font-size:10px;color:#a7a2b6}.play-small{background:var(--soft);color:var(--primary);width:38px;height:38px;min-height:38px;display:grid;place-items:center;border-radius:50%;flex-shrink:0}.play-small svg{width:18px;height:18px}.student-body{padding:0;text-align:left;min-width:0;flex:1;display:flex;gap:12px;align-items:center}.chevron{color:#b5b1c3}.chevron svg{width:17px}.bottom-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:rgba(255,255,255,.97);border-top:1px solid var(--line);display:flex;justify-content:space-around;backdrop-filter:blur(20px)}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:#aaa6b9;font-size:10px;min-width:60px;min-height:53px}.nav-item.active{color:var(--primary);font-weight:700}.nav-item svg{width:23px;height:23px}.mini-player{position:fixed;z-index:31;bottom:calc(78px + env(safe-area-inset-bottom));left:16px;right:16px;max-width:1112px;margin:auto;background:#fff;border:1px solid #eeebf7;box-shadow:0 6px 24px #33245c0b;border-radius:18px;padding:11px 14px;display:flex;align-items:center;gap:12px}.album{width:42px;height:42px;border-radius:12px;background:#e9e3ff;color:var(--primary);display:grid;place-items:center;flex-shrink:0}.mini-info{flex:1;min-width:0;text-align:left;padding:0}.mini-info b{font-size:13px;display:block}.mini-info small{font-size:11px;display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.bars{display:flex;gap:3px;align-items:center;height:25px;color:var(--primary)}.bars i{width:3px;height:12px;background:currentColor;border-radius:2px}.bars i:nth-child(2){height:22px}.bars i:nth-child(3){height:16px}.bars.playing i{animation:wave .7s infinite alternate}.bars.playing i:nth-child(2){animation-delay:.3s}@keyframes wave{to{height:6px}}.page-head{display:flex;gap:10px;align-items:center;margin:0 0 20px}.page-head h1{font-size:25px}.page-head p{font-size:12px;color:var(--muted);margin-top:4px}.steps{display:flex;align-items:center;justify-content:center;gap:12px;margin:0 0 25px;color:#aaa4bd;font-size:12px}.steps b{display:inline-grid;place-items:center;width:23px;height:23px;background:#e9e7f0;border-radius:50%;margin-right:5px;font-size:11px}.steps .active{color:var(--primary)}.steps .active b{background:var(--primary);color:white}.steps span.line{width:30px;height:1px;background:#ddd8ec}.check{width:25px;height:25px;min-height:25px;border:1.5px solid #ddd9e8;border-radius:8px;display:grid;place-items:center;flex-shrink:0;color:white;background:white}.check.selected{background:var(--primary);border-color:var(--primary)}.check svg{width:17px}.selection-row{width:100%;text-align:left}.selected .avatar{box-shadow:0 0 0 2px white,0 0 0 3px #e7dfff}.text-btn{font-size:13px;color:var(--primary);padding:6px}.sticky-action{position:fixed;z-index:32;bottom:calc(76px + env(safe-area-inset-bottom));left:0;right:0;background:rgba(247,247,251,.97);padding:14px 24px;border-top:1px solid var(--line);backdrop-filter:blur(16px)}.action-inner{max-width:1112px;margin:auto;display:flex;gap:18px;align-items:center}.action-inner .primary{flex:1}.selection-count{font-size:13px;color:var(--muted);white-space:nowrap}.selection-count b{font-size:22px;color:var(--primary);margin:0 4px}.panel{background:white;border-radius:var(--radius);padding:20px;margin-bottom:18px}.label{font-size:12px;color:var(--muted);margin-bottom:12px}.mode-tabs{display:flex;gap:10px}.mode-tabs button{flex:1;border:1px solid var(--line);border-radius:13px;padding:12px 5px;color:#888196;font-size:14px}.mode-tabs button.active{background:var(--soft);border-color:#cfc3ff;color:var(--primary);font-weight:650}.setting-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}.setting-row:last-child{border-bottom:0;padding-bottom:0}.setting-row h3{font-size:14px}.setting-row p{font-size:11px;color:var(--muted);margin-top:4px}.setting-row select{border:0;background:#f5f3fa;border-radius:9px;padding:0 9px;color:var(--primary);max-width:130px}.switch{background:#dcd9e6;width:45px;min-height:27px;height:27px;border-radius:20px;padding:3px;position:relative;flex-shrink:0}.switch.on{background:var(--primary)}.switch:after{content:'';position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;background:white;transition:.2s}.switch.on:after{left:21px}.order-row{display:flex;gap:10px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}.order-row:last-child{border:0}.order-num{font-size:13px;color:#b7afc6;width:18px;flex-shrink:0}.order-row .avatar{width:43px;height:43px;font-size:18px;border-radius:14px}.song-select{max-width:100%;border:0;background:none;color:#9385bc;font-size:12px;padding:0;min-height:30px;width:100%;text-overflow:ellipsis}.reorder{display:flex;flex-direction:column;flex-shrink:0}.reorder button{min-height:26px;height:26px;width:30px;display:grid;place-items:center;color:#b2a9c3}.reorder svg{width:16px;height:16px}.info-note{font-size:11px;color:var(--muted);margin:12px 0 0;line-height:1.8}.live{text-align:center}.live-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px;color:var(--muted);font-size:12px}.live-label{display:inline-flex;align-items:center;gap:7px;color:var(--primary);font-size:13px}.live-label:before{content:'';width:7px;height:7px;border-radius:50%;background:currentColor}.live .avatar{width:70px;height:70px;font-size:27px;margin:0 auto 13px;border-radius:23px}.live h1{font-size:30px}.live .song-name{font-size:13px;color:var(--muted);margin:7px 0 22px}.timer{width:min(64vw,240px);height:min(64vw,240px);border-radius:50%;margin:0 auto 20px;background:conic-gradient(var(--primary) var(--progress,85%),#ebe6fb 0);padding:7px;box-shadow:0 12px 40px #7052ef09}.timer-inner{background:var(--bg);border-radius:50%;height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;border:8px solid var(--bg)}.timer-label{font-size:12px;color:var(--primary);margin-bottom:5px}.timer strong{font-size:51px;line-height:1.15;font-weight:650;letter-spacing:-2px;font-variant-numeric:tabular-nums}.timer small{margin-top:8px;font-size:11px}.live-controls{display:flex;justify-content:center;align-items:center;gap:22px;margin:20px 0 26px}.live-controls>button{display:flex;align-items:center;flex-direction:column;gap:5px;color:#9a91ad;font-size:11px;min-width:55px}.live-controls .big-play{background:var(--primary);color:white;border-radius:24px;width:80px;height:70px;justify-content:center;box-shadow:0 9px 23px #7052ef2a}.big-play svg{width:28px;height:28px}.next-card{display:flex;align-items:center;gap:13px;text-align:left;background:white;border-radius:18px;padding:16px;margin-top:16px}.next-card .avatar{width:43px;height:43px;margin:0;font-size:17px;border-radius:14px}.next-card .student-info p{margin-top:2px}.next-card small{font-size:10px}.full-width{width:100%}.queue-preview{text-align:left;margin-top:25px}.queue-preview .student{padding:13px 0}.queue-preview .avatar{margin:0;width:38px;height:38px;border-radius:13px;font-size:16px}.status-tag{font-size:11px;color:var(--primary)}.library-item{display:flex;align-items:center;gap:13px;padding:17px 0;border-bottom:1px solid var(--line)}.library-item:last-child{border:0}.library-item h3{font-size:14px}.library-item p{font-size:11px;color:var(--muted);margin-top:4px}.upload-box{border:1.5px dashed #d5caed;background:#f1edff;border-radius:20px;padding:26px;text-align:center;color:var(--primary);margin:0 0 24px;display:block;width:100%}.upload-box svg{width:28px;height:28px}.upload-box b{display:block;margin:9px 0 5px;font-size:15px}.upload-box small{font-size:11px;color:#a18cbe}.setting-avatar{display:flex;gap:14px;align-items:center}.setting-avatar .coach{width:55px;height:55px;font-size:20px}.settings-link{display:flex;width:100%;align-items:center;justify-content:space-between;text-align:left;padding:15px 0;border-bottom:1px solid var(--line);font-size:14px}.settings-link:last-child{border:0}.settings-link>span{display:flex;align-items:center;gap:12px}.settings-link svg{color:#a39bb6}.toast{position:fixed;z-index:100;left:50%;bottom:180px;transform:translate(-50%,10px);background:#2d253f;color:white;padding:12px 20px;border-radius:13px;font-size:13px;opacity:0;transition:.2s;pointer-events:none;max-width:90%;text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}.overlay{position:fixed;inset:0;background:#24203266;z-index:60;display:flex;align-items:flex-end;justify-content:center;backdrop-filter:blur(3px)}.sheet{background:var(--bg);border-radius:29px 29px 0 0;width:100%;max-width:560px;max-height:90dvh;overflow:auto;padding:12px 24px calc(28px + env(safe-area-inset-bottom));animation:slide .25s ease}.sheet-handle{width:35px;height:4px;border-radius:4px;background:#ddd6e8;margin:0 auto 15px}.sheet-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.sheet-profile{text-align:center;margin-bottom:24px}.sheet-profile .avatar{margin:auto auto 12px;width:65px;height:65px;font-size:27px;border-radius:21px}.sheet-profile h2{font-size:23px}.sheet-profile p{font-size:12px;color:var(--muted);margin-top:6px}.default-tag{display:inline-block;font-size:9px;color:var(--primary);background:var(--soft);padding:2px 6px;border-radius:5px;margin-left:5px}.sheet .panel{padding:5px 16px}.player-art{width:150px;height:150px;border-radius:37px;background:#e8e1ff;color:var(--primary);display:grid;place-items:center;margin:20px auto 28px;box-shadow:0 16px 40px #7052ef12}.player-art svg{width:62px;height:62px}.range{accent-color:var(--primary);width:100%;min-height:24px}.time-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:11px}.empty{text-align:center;padding:40px 10px;color:var(--muted);font-size:13px}.desktop-note{display:none}.done{text-align:center;padding:50px 0}.done .avatar{width:90px;height:90px;margin:0 auto 25px;border-radius:30px}.done h1{margin-bottom:10px}.done p{color:var(--muted);margin-bottom:30px;font-size:14px}@keyframes slide{from{transform:translateY(35px);opacity:0}to{transform:translateY(0);opacity:1}}@media(min-width:800px){:root{--nav:0px}.app{padding-left:190px}.header{padding:25px 32px;height:95px}.content{padding:15px 32px 135px}.brand{font-size:21px}.bottom-nav{right:auto;top:0;bottom:0;width:190px;flex-direction:column;justify-content:flex-start;gap:10px;padding:135px 19px 20px;border-top:0;border-right:1px solid var(--line)}.nav-item{flex-direction:row;justify-content:flex-start;font-size:14px;padding:0 18px;gap:13px;min-height:53px}.nav-item.active{background:var(--soft);border-radius:14px}.nav-item svg{width:21px}.mini-player{left:222px;right:32px;bottom:23px;max-width:906px}.training-banner{padding:28px 30px}.students{padding:0 22px}.student{padding:19px 0}.home-layout{display:grid;grid-template-columns:1fr 260px;gap:24px}.desktop-note{display:block}.desktop-note .panel{padding:24px}.desktop-note h3{margin-bottom:12px}.desktop-note p{font-size:12px;color:var(--muted);line-height:1.9}.desktop-note .big-note{font-size:40px;line-height:1.2;color:var(--primary);margin:20px 0 10px}.sticky-action{left:190px;bottom:0;padding:18px 32px}.action-inner{max-width:906px}.action-inner .primary{flex:initial;min-width:260px;margin-left:auto}.live{max-width:640px;margin:auto}.live-layout{display:grid;grid-template-columns:1fr 280px;gap:35px}.live-layout .live{width:100%}.live-layout .queue-preview{margin-top:0}.intro h1{font-size:32px}.sheet{border-radius:28px;margin:auto;max-height:85dvh;padding-bottom:28px}.overlay{align-items:center}.config-layout{display:grid;grid-template-columns:1fr 1fr;gap:22px}.config-layout .panel{margin:0}.date{display:block}.content.narrow{max-width:830px;margin:auto}}@media(max-width:359px){.header{padding:14px 17px}.content{padding-left:17px;padding-right:17px}h1{font-size:25px}.training-banner{padding:20px 17px}.training-banner h2{font-size:20px}.training-banner p{font-size:11px}.training-banner button{padding:0 12px}.student{gap:9px}.avatar{width:44px;height:44px}.class-label{display:none}.sheet{padding-left:18px;padding-right:18px}.sticky-action{padding-left:17px;padding-right:17px}.steps{gap:8px}.steps span.line{width:20px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== 轮滑动漫头像选择器（替换色块）===== */
.avatar-row{display:flex;flex-wrap:wrap;gap:10px}
.avatar-cell{width:52px;height:52px;border-radius:50%;padding:0;margin:0;border:2px solid transparent;background:#fff;overflow:hidden;cursor:pointer;flex:0 0 auto;box-sizing:border-box}
.avatar-cell img{width:100%;height:100%;object-fit:cover;display:block;border-radius:50%}
.avatar-cell.on{border-color:var(--primary);box-shadow:0 0 0 3px rgba(112,82,239,.15)}
.avatar-cell.custom{display:flex;align-items:center;justify-content:center;color:#aaa6b9;font-size:20px;background:#f4f2fb}
.avatar-img{width:100%;height:100%;object-fit:cover;display:block;border-radius:50%}

/* 暂停后出现的「重新播放」：不用拖进度条就能从头再播 */
.replay-btn{margin:0 0 18px;display:flex;align-items:center;justify-content:center;font-size:14px}

/* ===== 参训名单：播放次数（训练结束结算，管理员可清零） ===== */
.play-pill{display:inline-block;flex-shrink:0;font-size:10px;line-height:1.7;padding:1px 8px;border-radius:999px;background:#f1ecff;color:#7052ef;font-weight:650;white-space:nowrap}
.play-pill.zero{background:#f4f2f8;color:#a7a2b6}

/* ===== 学员自定义头像：列表 + 删除角标 ===== */
.avatar-slot{position:relative;width:52px;height:52px;flex:0 0 auto}
.avatar-del{position:absolute;top:-5px;right:-5px;width:20px;height:20px;border-radius:50%;background:#e15b64;color:#fff;font-size:13px;line-height:19px;text-align:center;z-index:2;box-shadow:0 1px 4px rgba(0,0,0,.18);padding:0;min-height:0}