:root{
  --primary:#5b6cff;
  --primary-dark:#4858e0;
  --secondary:#ff8a5b;
  --accent:#22c1c3;
  --success:#22c55e;
  --warning:#f59e0b;
  --danger:#ef4444;
  --bg:#eef2ff;
  --card:#ffffff;
  --text:#2b2f44;
  --muted:#8a90a8;
  --border:#e9ecf6;
  --radius:18px;
  --shadow:0 10px 30px rgba(91,108,255,.10);
  --shadow-sm:0 4px 14px rgba(43,47,68,.06);
}
*{box-sizing:border-box;margin:0;padding:0;}
body{
  font-family:"Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  background:linear-gradient(160deg,#eaf0ff 0%,#f4f7ff 45%,#fff4ee 100%);
  color:var(--text);
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
a{color:var(--primary);text-decoration:none;}

/* Topbar */
.topbar{
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:50;
}
.topbar-inner{
  max-width:1100px;margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.2rem;color:var(--text);}
.brand-logo{font-size:1.5rem;}
.brand-name{background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;background-clip:text;color:transparent;}
.nav{display:flex;align-items:center;gap:14px;}
.nav-link{color:var(--text);font-weight:500;}
.nav-admin{color:var(--accent);font-weight:600;}
.nav-admin:hover{color:var(--accent);}
.nav-link:hover{color:var(--primary);}
.nav-user{color:var(--muted);font-size:.9rem;}
/* 移动端菜单按钮（桌面隐藏） */
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:42px;padding:0 11px;border:1px solid var(--border);
  background:#fff;border-radius:12px;cursor:pointer;flex:none;
}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--text);border-radius:2px;transition:transform .2s,opacity .2s;}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.active span:nth-child(2){opacity:0;}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* Layout */
.container{max-width:1100px;width:100%;margin:0 auto;padding:24px 20px;flex:1;}
.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:10px;}
.page-head h1{font-size:1.6rem;}
.page-actions{display:flex;gap:10px;margin:18px 0;flex-wrap:wrap;}
.muted{color:var(--muted);}
.small{font-size:.82rem;}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  border:none;border-radius:12px;padding:10px 18px;font-size:.95rem;font-weight:600;
  cursor:pointer;transition:.18s transform,.18s box-shadow,.18s background;font-family:inherit;
}
.btn:hover{transform:translateY(-1px);}
.btn-sm{padding:6px 12px;font-size:.82rem;border-radius:10px;}
.btn-block{width:100%;padding:13px;}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 6px 16px rgba(91,108,255,.35);}
.btn-accent{background:linear-gradient(135deg,var(--accent),#17b3b5);color:#fff;box-shadow:0 6px 16px rgba(34,193,195,.3);}
.btn-secondary{background:linear-gradient(135deg,var(--secondary),#ff6f3c);color:#fff;}
.btn-ghost{background:#fff;color:var(--text);border:1px solid var(--border);}
.btn-ghost:hover{background:#f6f8ff;}
.btn-warning{background:var(--warning);color:#fff;}
.btn-danger{background:var(--danger);color:#fff;}

/* Cards */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden;margin-bottom:20px;}
.card-header{padding:16px 20px;border-bottom:1px solid var(--border);}
.card-title{font-size:1.1rem;}
.card-subtitle{color:var(--muted);font-size:.85rem;margin-top:4px;}
.card-body{padding:20px;}
.form-card{max-width:520px;}

/* Stat cards */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:20px;}
.stat-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-sm);}
.stat-icon{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;}
.stat-value{font-size:1.6rem;font-weight:700;}
.stat-label{color:var(--muted);font-size:.85rem;}
.stat-primary .stat-icon{background:rgba(91,108,255,.12);}
.stat-secondary .stat-icon{background:rgba(255,138,91,.15);}
.stat-accent .stat-icon{background:rgba(34,193,195,.15);}
.stat-success .stat-icon{background:rgba(34,197,94,.15);}

/* Modules */
.module-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin-bottom:24px;}
.module-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:.2s transform,.2s box-shadow;}
.module-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.module-icon{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;margin-bottom:14px;}
.module-card h3{margin-bottom:6px;}
.module-card p{color:var(--muted);font-size:.9rem;margin-bottom:14px;}
.module-primary .module-icon{background:rgba(91,108,255,.12);}
.module-secondary .module-icon{background:rgba(255,138,91,.15);}
.module-accent .module-icon{background:rgba(34,193,195,.15);}
.module-success .module-icon{background:rgba(34,197,94,.15);}
.module-warning .module-icon{background:rgba(245,158,11,.15);}
.module-locked{opacity:.9;}

/* Tables */
.table{width:100%;border-collapse:collapse;}
.table th,.table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:.92rem;}
.table th{color:var(--muted);font-weight:600;background:#fafbff;}
.table tbody tr:hover{background:#f8faff;}
.actions{display:flex;gap:6px;flex-wrap:wrap;}
.inline-form{display:inline;}

/* Forms */
.form-group{margin-bottom:16px;}
.form-group label{display:block;font-weight:600;margin-bottom:6px;font-size:.9rem;}
.req{color:var(--danger);}
.form-control{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:12px;font-size:.95rem;font-family:inherit;background:#fff;transition:.15s border,.15s box-shadow;}
.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(91,108,255,.15);}
.static-text{padding:11px 14px;background:#f6f8ff;border-radius:12px;color:var(--text);}
.form-actions{display:flex;gap:10px;margin-top:8px;}
.form-row-between{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;}
.checkbox{display:flex;align-items:center;gap:6px;font-size:.9rem;color:var(--muted);}

/* Badges */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:600;}
.badge-primary{background:rgba(91,108,255,.12);color:var(--primary);}
.badge-secondary{background:rgba(255,138,91,.15);color:#e8652f;}
.badge-accent{background:rgba(34,193,195,.15);color:#109ea0;}
.badge-success{background:rgba(34,197,94,.15);color:#16a34a;}
.badge-danger{background:rgba(239,68,68,.12);color:var(--danger);}
.badge-muted{background:#eef0f7;color:var(--muted);}

/* Alerts */
.flash-wrap{margin-bottom:18px;}
.alert{padding:12px 16px;border-radius:12px;margin-bottom:10px;font-size:.92rem;transition:opacity .3s;}
.alert-success{background:rgba(34,197,94,.12);color:#16a34a;}
.alert-danger{background:rgba(239,68,68,.12);color:var(--danger);}
.alert-warning{background:rgba(245,158,11,.14);color:#b9750a;}
.alert-info{background:rgba(91,108,255,.12);color:var(--primary);}

/* Empty */
.empty-state{padding:40px;text-align:center;color:var(--muted);}

/* Auth */
.auth-wrap{min-height:calc(100vh - 140px);display:flex;align-items:center;justify-content:center;padding:20px;}
.auth-card{background:#fff;border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow);width:100%;max-width:400px;padding:36px;}
.auth-head{text-align:center;margin-bottom:24px;}
.auth-logo{font-size:2.6rem;}
.auth-head h1{font-size:1.5rem;margin:8px 0 4px;}
.auth-head p{color:var(--muted);font-size:.9rem;}
.auth-form .form-group{margin-bottom:16px;}
.auth-tip{text-align:center;color:var(--muted);font-size:.82rem;margin-top:18px;}

/* Pagination */
.pagination{display:flex;align-items:center;gap:12px;margin-top:16px;}
.page-info{color:var(--muted);font-size:.88rem;}

/* Footer */
.footer{text-align:center;padding:18px;color:var(--muted);font-size:.82rem;}

/* Responsive */
@media (max-width:600px){
  .topbar-inner{padding:10px 14px;}
  .container{padding:18px 14px;}
  .page-head h1{font-size:1.35rem;}
  .nav{gap:8px;}
  .stat-value{font-size:1.3rem;}
  .practice-def{font-size:1.4rem;}
}

/* 教材 chips */
.book-chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{display:inline-block;padding:7px 14px;border-radius:999px;background:#fff;border:1px solid var(--border);color:var(--text);font-size:.88rem;font-weight:500;transition:.15s;cursor:pointer;}
.chip:hover{border-color:var(--primary);color:var(--primary);}
.chip-active{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-color:transparent;}
/* 教材范围筛选：年级 / 册数 / 单元 / 掌握度 分组 */
.filter-dim{margin-top:16px;}
.filter-label{font-weight:600;font-size:.9rem;margin-bottom:8px;color:var(--text);}

/* 掌握度分布 */
.level-bars{display:flex;flex-direction:column;gap:10px;}
.level-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#fafbff;border:1px solid var(--border);border-radius:12px;}
.level-tag{font-weight:600;}
.level-S{color:#16a34a;}
.level-A{color:#109ea0;}
.level-B{color:#e8652f;}
.level-C{color:#8a90a8;}
.level-count{font-weight:700;font-size:1.1rem;}

/* 拼写练习 */
.practice-card{max-width:680px;margin:0 auto;}
.practice-progress{color:var(--muted);font-size:.9rem;margin-bottom:14px;}
.practice-def{font-size:1.8rem;font-weight:700;margin-bottom:12px;}
.practice-meta{display:flex;align-items:center;gap:12px;margin-bottom:16px;}
.practice-pron{color:var(--muted);font-size:.95rem;}
.practice-input{font-size:1.2rem;padding:14px 16px;margin-bottom:12px;}
.practice-feedback{min-height:24px;font-weight:600;margin-bottom:12px;}
.feedback-ok{color:var(--success);}
.feedback-no{color:var(--danger);}
.practice-finish{text-align:center;padding:24px 0;}
.practice-finish h3{margin-bottom:8px;}
.practice-listen-hint{font-size:1.05rem;font-weight:600;color:var(--primary);margin-bottom:12px;padding:10px 14px;background:#f3f6ff;border:1px solid var(--border);border-radius:12px;}

/* ===== 时间记录 / 计时器（移动端优先） ===== */
.timer-page{max-width:640px;}
.timer-nav{display:flex;gap:8px;}

.timer-running .running-label{color:var(--muted);font-size:.9rem;}
.timer-running .running-project{font-size:1.3rem;font-weight:700;margin:4px 0 8px;}
.timer-display{font-size:3.6rem;font-weight:800;font-variant-numeric:tabular-nums;text-align:center;letter-spacing:2px;margin:6px 0;}
.timer-sub{text-align:center;color:var(--muted);font-size:.85rem;margin-bottom:18px;}
.timer-actions{display:flex;flex-direction:column;gap:10px;}

.project-grid{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 18px;}
.project-chip{display:inline-flex;align-items:center;gap:8px;border:2px solid var(--c,#5b6cff);background:#fff;color:var(--text);border-radius:999px;padding:11px 18px;font-size:.98rem;font-weight:600;cursor:pointer;transition:.15s;font-family:inherit;}
.project-chip .chip-dot{width:12px;height:12px;border-radius:50%;background:var(--c,#5b6cff);}
.project-chip.selected{background:var(--c,#5b6cff);color:#fff;}
.project-chip.selected .chip-dot{background:#fff;}

.today-list{display:flex;flex-direction:column;gap:10px;}
.today-item{display:flex;align-items:center;gap:10px;padding:11px 13px;background:#fafbff;border-radius:12px;}
.today-item .dot,.proj-item .dot,.breakdown-row .dot{width:12px;height:12px;border-radius:50%;flex:none;}
.ti-name,.proj-name,.bd-name{flex:1;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.ti-time{color:var(--muted);font-size:.85rem;}
.ti-dur{font-weight:700;color:var(--primary);min-width:64px;text-align:right;}

/* 统计 */
.week-bars{display:flex;align-items:flex-end;gap:8px;height:170px;}
.week-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end;}
.week-bar{width:60%;max-width:34px;background:linear-gradient(180deg,var(--primary),var(--primary-dark));border-radius:8px 8px 0 0;min-height:2px;transition:height .3s;}
.week-val{font-size:.68rem;color:var(--muted);}
.week-label{font-size:.72rem;color:var(--muted);}
.breakdown-row{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.bd-bar{flex:1;height:10px;background:var(--border);border-radius:999px;overflow:hidden;}
.bd-fill{display:block;height:100%;border-radius:999px;}
.bd-val{min-width:70px;text-align:right;font-weight:700;}

/* 项目管理 */
.color-row{display:flex;flex-wrap:wrap;gap:10px;}
.color-opt{cursor:pointer;}
.color-opt input{display:none;}
.color-opt span{display:block;width:28px;height:28px;border-radius:50%;border:3px solid #fff;box-shadow:0 0 0 1px var(--border);}
.color-opt input:checked + span{box-shadow:0 0 0 3px var(--primary);}
.proj-list{display:flex;flex-direction:column;gap:10px;}
.proj-item{display:flex;align-items:center;gap:10px;padding:11px 13px;background:#fafbff;border-radius:12px;}

@media (max-width:600px){
  .timer-display{font-size:3rem;}
  .timer-page .btn-lg{padding:15px;}
}

/* 练习设置面板 */
.setup-card{max-width:680px;margin:0 auto 18px;}
.setup-title{margin-bottom:16px;}
.setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.setup-field{display:flex;flex-direction:column;gap:10px;}
.setup-label{font-weight:600;color:var(--text);}
.mode-options{display:flex;flex-direction:column;gap:10px;}
.radio-card{display:flex;flex-direction:column;gap:2px;padding:12px 14px;border:1px solid var(--border);border-radius:14px;background:#fff;cursor:pointer;transition:.15s;}
.radio-card:hover{border-color:var(--primary);}
.radio-card input{position:absolute;opacity:0;}
.radio-card:has(input:checked){border-color:var(--primary);background:#f3f6ff;box-shadow:0 0 0 3px rgba(93,108,250,.12);}
.radio-title{font-weight:700;}
.radio-card small{color:var(--muted);}
.count-options{display:flex;gap:10px;flex-wrap:wrap;}
.count-options .chip{padding:10px 18px;cursor:pointer;position:relative;}
.count-options .chip input{position:absolute;opacity:0;}
.count-options .chip:has(input:checked){background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-color:transparent;}

@media (max-width:600px){
  .setup-grid{grid-template-columns:1fr;gap:18px;}
}

/* 代码样例 */
.code-sample{background:#0f172a;color:#e2e8f0;padding:14px;border-radius:12px;font-size:.82rem;overflow:auto;margin:8px 0;}

/* ---------- 音频中心 ---------- */
.audio-layout{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start;}
.rec-box{display:flex;align-items:center;gap:14px;margin-bottom:14px;}
.rec-time{font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums;}
.btn.recording{animation:pulse 1.1s infinite;}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(232,101,47,.5);}70%{box-shadow:0 0 0 10px rgba(232,101,47,0);}100%{box-shadow:0 0 0 0 rgba(232,101,47,0);}}
.audio-list{display:flex;flex-direction:column;gap:14px;}
.audio-item{padding:14px;border:1px solid var(--border);border-radius:14px;background:#fff;}
.audio-meta{display:flex;align-items:center;gap:10px;margin-bottom:6px;}
.audio-text{white-space:pre-wrap;background:#fafbff;border:1px dashed var(--border);border-radius:10px;padding:8px 10px;margin:6px 0 10px;color:var(--text);font-size:.92rem;}
.audio-player{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.audio-player audio{flex:1;min-width:200px;height:40px;}
.loop-btn.active{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-color:transparent;}
.del-btn{margin-top:10px;}

@media (max-width:760px){
  .audio-layout{grid-template-columns:1fr;}
}

/* ---------- 播放列表 ---------- */
.inline-form{display:flex;gap:10px;flex-wrap:wrap;}
.inline-form .form-control{flex:1;min-width:200px;}
.pl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;}
.pl-card{display:flex;flex-direction:column;gap:8px;padding:14px;border:1px solid var(--border);border-radius:14px;background:#fff;}
.pl-name{font-weight:700;font-size:1.05rem;color:var(--primary);text-decoration:none;}
.pl-actions{display:flex;gap:8px;}

.player-card{margin-bottom:18px;}
.player-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px;}
.pl-now{font-weight:600;color:var(--text);}
.player-progress{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.pl-time{font-size:.8rem;color:var(--muted);font-variant-numeric:tabular-nums;min-width:40px;text-align:center;flex:none;}
.pl-seek{flex:1;-webkit-appearance:none;appearance:none;height:6px;border-radius:999px;background:var(--border);outline:none;cursor:pointer;}
.pl-seek::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:16px;height:16px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 3px rgba(91,108,255,.18);cursor:pointer;}
.pl-seek::-moz-range-thumb{width:16px;height:16px;border:none;border-radius:50%;background:var(--primary);box-shadow:0 0 0 3px rgba(91,108,255,.18);cursor:pointer;}
.player-modes{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.mode-btn.active{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-color:transparent;}

.track-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;}
.track{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--border);border-radius:12px;background:#fff;cursor:pointer;transition:.12s;}
.track:hover{border-color:var(--primary);}
.track.playing{border-color:var(--primary);background:#f3f6ff;box-shadow:0 0 0 3px rgba(93,108,250,.12);}
.track-no{width:24px;height:24px;flex:0 0 auto;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;}
.track-title{flex:1;font-weight:600;}

.add-pl{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:10px;}
.add-pl .pl-select{padding:7px 10px;border:1px solid var(--border);border-radius:10px;}
.add-pl .pl-new{flex:1;min-width:140px;padding:7px 10px;border:1px solid var(--border);border-radius:10px;}

/* ---------- 错题收集 ---------- */
.hidden{display:none !important;}
.head-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;}
.badge-warning{background:rgba(245,158,11,.16);color:#b45309;}

/* 通用表单控件（补齐 .input 基础样式） */
.input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:.92rem;background:#fff;color:var(--text);box-sizing:border-box;}
.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(93,108,250,.12);}
textarea.input{resize:vertical;line-height:1.5;}
.input-sm{padding:6px 10px;font-size:.85rem;border-radius:9px;}
.btn-xs{padding:3px 9px;font-size:.75rem;border-radius:8px;border:none;cursor:pointer;}

/* 筛选栏 */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:18px;}
.filter-bar .input{width:auto;}

/* 错题网格 */
.mistake-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;}
.mistake-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden;text-decoration:none;color:inherit;transition:.15s;box-shadow:var(--shadow-sm);}
.mistake-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--primary);}
.mistake-thumb{aspect-ratio:4/3;background:#f3f5fb;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.mistake-thumb img{width:100%;height:100%;object-fit:cover;}
.mistake-thumb-empty{color:var(--muted);font-size:.85rem;}
.mistake-meta{padding:12px 14px;display:flex;flex-direction:column;gap:8px;}
.mistake-row{display:flex;align-items:center;gap:8px;}
.mistake-stem{font-weight:600;font-size:.95rem;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.mistake-sub{font-size:.8rem;}

/* 上传预览 */
.upload-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:4px;}
.upload-preview{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0 4px;}
.preview-item{position:relative;width:120px;border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#fff;}
.preview-item img{width:100%;height:90px;object-fit:cover;display:block;}
.preview-item span{display:block;font-size:.72rem;color:var(--muted);padding:3px 6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.preview-remove{position:absolute;top:4px;right:4px;width:22px;height:22px;border:none;border-radius:50%;background:rgba(0,0,0,.55);color:#fff;font-size:15px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;}
.preview-remove:hover{background:rgba(0,0,0,.8);}

/* 图片筛选栏（学科/年级/册数/小标签） */
.img-filters{display:flex;flex-direction:column;gap:10px;margin-bottom:16px;}
.filter-group{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.filter-label{font-size:.82rem;color:var(--muted);font-weight:600;margin-right:2px;}
.input-sm{padding:5px 10px;font-size:.85rem;min-height:auto;width:auto;}
.img-filters .chip{cursor:pointer;}

/* 上传来源按钮 / 隐藏输入 / 提示 */
.upload-actions{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:6px;}
.hidden-input{display:none;}
.upload-hint{font-size:.78rem;margin:6px 0 0;}

/* 页内摄像头拍照弹层（移动端全屏，桌面居中） */
.camera-modal{position:fixed;inset:0;z-index:1000;background:rgba(0,0,0,.82);display:flex;align-items:center;justify-content:center;padding:16px;}
.camera-modal[hidden]{display:none;}
.camera-modal-inner{width:100%;max-width:560px;background:#111;border-radius:16px;overflow:hidden;display:flex;flex-direction:column;}
.camera-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;color:#fff;font-weight:600;}
.camera-close{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;line-height:1;}
.camera-stage{position:relative;background:#000;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;}
.camera-stage video{width:100%;height:100%;object-fit:contain;background:#000;}
.camera-msg{position:absolute;left:0;right:0;bottom:0;padding:10px 14px;color:#ffd;font-size:.82rem;text-align:center;background:rgba(0,0,0,.45);}
.camera-foot{display:flex;gap:10px;justify-content:center;padding:14px;background:#111;}
.camera-foot .btn{min-width:96px;}

/* AI 解析入口 */
.ai-parse-wrap{margin:10px 0 4px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;}

/* 标签组件 */
.tag-widget{display:flex;flex-direction:column;gap:8px;}
.tag-chips{display:flex;flex-wrap:wrap;gap:8px;}
.tag-chip{display:inline-flex;align-items:center;gap:6px;background:var(--primary);color:#fff;padding:5px 10px;border-radius:999px;font-size:.85rem;}
.tag-x{cursor:pointer;font-weight:700;opacity:.85;}
.tag-x:hover{opacity:1;}
.tag-suggestions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:4px;}
.tag-sug{cursor:pointer;border:1px dashed var(--border);background:#fff;color:var(--text);padding:4px 10px;border-radius:999px;font-size:.82rem;}
.tag-sug:hover{border-color:var(--primary);color:var(--primary);}

/* 裁剪弹窗 */
.crop-modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px;}
.crop-modal[hidden]{display:none;}
.crop-modal-inner{background:#fff;border-radius:16px;padding:16px;max-width:92vw;max-height:92vh;display:flex;flex-direction:column;gap:12px;}
.crop-stage{position:relative;display:inline-block;line-height:0;max-width:100%;touch-action:none;user-select:none;}
.crop-stage img{display:block;max-width:100%;max-height:62vh;}
.crop-box{position:absolute;border:2px dashed #fff;box-shadow:0 0 0 9999px rgba(0,0,0,.45);cursor:move;box-sizing:border-box;}
.crop-handle{position:absolute;right:-7px;bottom:-7px;width:14px;height:14px;background:var(--primary);border:2px solid #fff;border-radius:50%;cursor:nwse-resize;}
.crop-actions{display:flex;justify-content:flex-end;gap:10px;}

/* 表单布局 */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
.form-item{display:flex;flex-direction:column;gap:6px;margin-bottom:14px;}
.field-label{font-weight:600;font-size:.9rem;color:var(--text);}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:6px;}

/* 详情 */
.detail-grid{display:grid;grid-template-columns:1fr 360px;gap:20px;align-items:start;}
.detail-images{display:flex;flex-direction:column;gap:14px;}
.detail-figure{margin:0;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#fff;}
.detail-figure img{width:100%;display:block;cursor:zoom-in;}
.detail-figure figcaption{text-align:center;padding:8px;font-size:.82rem;}
.detail-figure figcaption a{color:var(--primary);text-decoration:none;}
.detail-info .info-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed var(--border);font-size:.92rem;}
.detail-info .info-block{margin:10px 0;}
.detail-info .info-k{font-weight:600;color:var(--muted);font-size:.82rem;margin-bottom:3px;}
.detail-info .info-v{font-size:.95rem;line-height:1.5;white-space:pre-wrap;}
.danger-text{color:var(--danger);}
.ok-text{color:#16a34a;}

/* 复习模式 */
.review-wrap{max-width:680px;margin:0 auto;}
.review-progress{text-align:center;color:var(--muted);font-size:.9rem;margin-bottom:14px;}
.review-images{display:flex;flex-direction:column;gap:12px;margin-bottom:14px;}
.review-images img{width:100%;border:1px solid var(--border);border-radius:12px;cursor:zoom-in;}
.review-answer{margin:12px 0;border-top:1px dashed var(--border);padding-top:12px;}
.review-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:14px;}

@media (max-width:760px){
  .detail-grid{grid-template-columns:1fr;}
  .form-grid{grid-template-columns:1fr;}
}

/* =========================================================
   响应式总控：桌面 > 平板横屏 > 平板竖屏 > 手机
   断点说明：
   · ≥1024px  平板横屏 / 电脑：完整横向导航 + 桌面栅格
   · ≤1023px  平板竖屏 / 手机：导航折叠为抽屉
   · 768–1023 平板竖屏：接近桌面（卡片 3 列）
   · ≤767px   手机：卡片 2 列，压缩留白
   · ≤359px   超小屏：模块卡片单列兜底
   ========================================================= */

/* —— ≤1023px：导航折叠为下拉抽屉 —— */
@media (max-width:1023px){
  .topbar-inner{position:relative;}
  .nav-toggle{display:inline-flex;}
  .nav{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:#fff;border-bottom:1px solid var(--border);
    box-shadow:0 18px 34px rgba(43,47,68,.14);
    padding:10px 12px 14px;
    max-height:calc(100vh - 62px);overflow-y:auto;
    display:none;
  }
  .nav.open{display:flex;}
  .nav-link{padding:12px 14px;border-radius:12px;font-size:1rem;}
  .nav-link:hover{background:#f3f6ff;}
  .nav-user{padding:11px 14px;font-size:.85rem;border-top:1px dashed var(--border);margin-top:6px;}
  .nav .btn{margin-top:8px;}
}

/* —— 768–1023px 平板竖屏：贴近桌面，卡片 3 列 —— */
@media (min-width:768px) and (max-width:1023px){
  .module-grid{grid-template-columns:repeat(3,1fr);}
  .stat-grid{grid-template-columns:repeat(4,1fr);}
  .mistake-grid{grid-template-columns:repeat(3,1fr);}
  .pl-grid{grid-template-columns:repeat(2,1fr);}
}

/* —— ≤767px 手机：卡片两列，压缩留白 —— */
@media (max-width:767px){
  .topbar-inner{padding:10px 14px;}
  .brand-name{font-size:1.05rem;}
  .container{padding:16px 12px;}
  .page-head{margin-bottom:16px;gap:8px;}
  .page-head h1{font-size:1.3rem;}
  .card{border-radius:16px;margin-bottom:16px;}
  .card-header{padding:14px 15px;}
  .card-body{padding:15px 14px;}

  /* 功能模块卡片：一排两个 */
  .module-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:18px;}
  .module-card{padding:15px 13px;}
  .module-icon{width:42px;height:42px;font-size:1.35rem;border-radius:12px;margin-bottom:10px;}
  .module-card h3{font-size:.98rem;line-height:1.25;}
  .module-card p{font-size:.8rem;margin-bottom:10px;}
  .module-card .btn{width:100%;}

  /* 统计卡片：一排两个 */
  .stat-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .stat-card{padding:14px 12px;gap:10px;}
  .stat-icon{width:40px;height:40px;font-size:1.25rem;border-radius:12px;}
  .stat-value{font-size:1.25rem;}
  .stat-label{font-size:.78rem;}

  /* 错题 / 图片网格：一排两个 */
  .mistake-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .mistake-meta{padding:10px 11px;gap:6px;}
  .mistake-stem{font-size:.88rem;}

  /* 播放列表：单列更易读 */
  .pl-grid{grid-template-columns:1fr;}

  /* 其它双列布局统一堆叠 */
  .detail-grid,.form-grid,.setup-grid,.audio-layout{grid-template-columns:1fr;}

  /* 图表压缩 */
  .week-bars{height:140px;}
  .timer-display{font-size:3rem;}

  /* 管理端表格：横向滚动，避免挤压 */
  .table{display:block;width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;}
  .table th,.table td{padding:10px 12px;white-space:nowrap;}

  /* 表单 / 操作按钮铺满，便于点按 */
  .form-card{max-width:100%;}
  .filter-bar .input{width:100%;}
  .page-actions .btn,.head-actions .btn{flex:1;}
  .form-actions{flex-direction:column;}
  .form-actions .btn{width:100%;}
}

/* —— ≤359px 超小屏：模块卡片单列兜底 —— */
@media (max-width:359px){
  .container{padding:14px 10px;}
  .module-grid{grid-template-columns:1fr;}
}