/* song-en v19.1 设计系统：现代玻璃拟态 + Bento Grid + 暗色模式 + 响应式 + 流畅动效 */
:root{
  --accent:#5b7cfa; --accent2:#8b5cf6; --accent3:#22d3ee;
  --ok:#10b981; --warn:#f59e0b; --bad:#ef4444;
  --bg1:#eef2ff; --bg2:#fdf2f8; --bg3:#e0f2fe;
  --glass:rgba(255,255,255,.66); --glass2:rgba(255,255,255,.42);
  --glass-brd:rgba(255,255,255,.65); --glass-shadow:0 10px 40px -10px rgba(50,60,120,.16), 0 2px 8px rgba(31,41,55,.05);
  --tx:#0f172a; --tx2:#475569; --tx3:#94a3b8;
  --chip:rgba(91,124,250,.12); --chip-tx:#4353d6;
  --radius:22px; --radius-sm:14px;
  --blur:saturate(1.6) blur(20px);
  --ring:0 0 0 3px rgba(91,124,250,.18);
  --font:"Inter","SF Pro Display",-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",Roboto,sans-serif;
  --ease:cubic-bezier(.22,.8,.26,.99);
}
[data-theme="dark"]{
  --bg1:#0a0e1a; --bg2:#111a2e; --bg3:#0d1526;
  --glass:rgba(19,26,46,.6); --glass2:rgba(19,26,46,.4);
  --glass-brd:rgba(148,163,184,.16); --glass-shadow:0 14px 44px -12px rgba(0,0,0,.55), 0 2px 10px rgba(0,0,0,.3);
  --tx:#e8ecf4; --tx2:#9aa7bd; --tx3:#5f6b81;
  --chip:rgba(122,146,255,.16); --chip-tx:#aab8ff;
  --ring:0 0 0 3px rgba(122,146,255,.25);
}
*{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px;scroll-behavior:smooth}
body{font-family:var(--font);color:var(--tx);background:#dfe6f9;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
[data-theme="dark"] body{background:#0a0e1a}
/* 渐变流光背景 */
#bg-deco{position:fixed;inset:0;z-index:-2;background:linear-gradient(130deg,var(--bg1),var(--bg2) 45%,var(--bg3))}
#bg-deco .orb{position:fixed;border-radius:50%;filter:blur(90px);opacity:.55;animation:drift 26s var(--ease) infinite alternate;will-change:transform}
#bg-deco .o1{width:520px;height:520px;background:radial-gradient(circle at 30% 30%,#93b4ff,#5b7cfa);top:-160px;left:-120px}
#bg-deco .o2{width:460px;height:460px;background:radial-gradient(circle at 60% 40%,#f0abfc,#a855f7);bottom:-140px;right:-100px;animation-delay:-8s}
#bg-deco .o3{width:380px;height:380px;background:radial-gradient(circle at 50% 50%,#7dd3fc,#22d3ee);top:35%;left:55%;opacity:.4;animation-delay:-16s}
[data-theme="dark"] #bg-deco .orb{opacity:.35;filter:blur(110px)}
@keyframes drift{from{transform:translate(0,0) scale(1)}to{transform:translate(70px,50px) scale(1.12)}}

.glass{background:var(--glass);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--glass-brd);box-shadow:var(--glass-shadow)}
.card{background:var(--glass);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--glass-brd);border-radius:var(--radius);box-shadow:var(--glass-shadow);padding:1.15rem 1.25rem;transition:transform .35s var(--ease),box-shadow .35s var(--ease);position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0 0 auto;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.75),transparent);opacity:.7}
[data-theme="dark"] .card::before{background:linear-gradient(90deg,transparent,rgba(148,163,184,.35),transparent)}
.card:hover{transform:translateY(-3px);box-shadow:0 18px 50px -12px rgba(50,60,120,.25),0 4px 14px rgba(31,41,55,.07)}
.card.glass2{background:var(--glass2)}

/* 布局 */
.app-shell{display:flex;min-height:100vh}
.sidebar{width:236px;flex-shrink:0;margin:14px 0 14px 14px;border-radius:var(--radius);padding:1.15rem .85rem;display:flex;flex-direction:column;position:sticky;top:14px;height:calc(100vh - 28px);z-index:60}
.brand{display:flex;gap:.6rem;align-items:center;text-decoration:none;color:var(--tx);font-weight:800;font-size:1.16rem;letter-spacing:.2px;padding:.3rem .5rem 1rem}
.brand-logo{width:34px;height:34px;border-radius:10px;box-shadow:0 6px 16px -4px rgba(91,124,250,.5)}
.nav{display:flex;flex-direction:column;gap:.18rem;flex:1;overflow-y:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{display:flex;align-items:center;gap:.7rem;padding:.58rem .8rem;border-radius:12px;color:var(--tx2);text-decoration:none;font-size:.94rem;font-weight:500;position:relative;transition:all .25s var(--ease)}
.nav a .ico{width:1.35rem;text-align:center;font-size:1.05rem;filter:saturate(.9)}
.nav a:hover{color:var(--tx);background:rgba(148,163,184,.12);transform:translateX(2px)}
.nav a.active{color:#fff;background:linear-gradient(120deg,var(--accent),var(--accent2));box-shadow:0 8px 20px -6px rgba(91,124,250,.55)}
[data-theme="dark"] .nav a.active{box-shadow:0 8px 22px -6px rgba(91,124,250,.4)}
.sidebar-foot{display:flex;gap:.45rem;align-items:center;margin-top:.7rem}
.sidebar-foot .grow{flex:1;min-width:0}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0;border:2px solid rgba(255,255,255,.5)}

.main-wrap{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{position:sticky;top:14px;margin:14px 18px 0;border-radius:16px;padding:.6rem 1rem;display:flex;align-items:center;gap:.8rem;z-index:50}
.topbar-title{font-weight:700;font-size:1.05rem}
.menu-btn{display:none}
.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:.6rem}
.health-dot{width:9px;height:9px;border-radius:50%;background:#94a3b8;box-shadow:0 0 0 0 rgba(16,185,129,.5)}
.health-dot.on{background:var(--ok);animation:pulse 2.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(16,185,129,.45)}70%{box-shadow:0 0 0 8px rgba(16,185,129,0)}100%{box-shadow:0 0 0 0 rgba(16,185,129,0)}}

.page{flex:1;padding:1.4rem 1.6rem 2.5rem;max-width:1180px;width:100%;margin:0 auto;animation:pageIn .38s var(--ease)}
@keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
h1{font-size:1.55rem;font-weight:800;letter-spacing:-.02em;margin-bottom:1.1rem;display:flex;align-items:center;gap:.55rem}
h3{font-size:1.05rem;font-weight:700;letter-spacing:-.01em}
.muted{color:var(--tx2)}
.tiny{font-size:.8rem;color:var(--tx3)}
.row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
.stack{display:flex;flex-direction:column;gap:.75rem}
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}
.bento{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-auto-rows:minmax(96px,auto)}
.bento .b2{grid-column:span 2}.bento .b3{grid-column:span 3}
@media(max-width:900px){.bento .b2,.bento .b3{grid-column:span 2}}
@media(max-width:560px){.bento .b2,.bento .b3{grid-column:span 1}}

/* Bento 数字卡 */
.stat-num{font-size:2rem;font-weight:800;letter-spacing:-.03em;background:linear-gradient(120deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.bar{height:9px;border-radius:6px;background:rgba(148,163,184,.18);overflow:hidden}
.bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--accent),var(--accent3));transition:width .9s var(--ease)}

/* 控件 */
input,select,textarea{background:rgba(255,255,255,.75);border:1px solid rgba(148,163,184,.35);border-radius:12px;padding:.62rem .85rem;color:var(--tx);font:inherit;outline:none;transition:box-shadow .25s,border-color .25s}
[data-theme="dark"] input,[data-theme="dark"] select,[data-theme="dark"] textarea{background:rgba(15,23,42,.5);border-color:rgba(148,163,184,.25)}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:var(--ring)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;border:none;border-radius:12px;padding:.62rem 1.15rem;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;transition:all .25s var(--ease);white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn.primary{color:#fff;background:linear-gradient(120deg,var(--accent),var(--accent2));box-shadow:0 8px 22px -8px rgba(91,124,250,.65)}
.btn.primary:hover{filter:brightness(1.06);box-shadow:0 10px 26px -8px rgba(91,124,250,.8);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--tx2);border:1px solid rgba(148,163,184,.4)}
.btn.ghost:hover{color:var(--tx);border-color:var(--accent);box-shadow:var(--ring)}
.btn.danger{background:linear-gradient(120deg,#f87171,#ef4444);color:#fff}
.btn.sm{padding:.35rem .7rem;font-size:.82rem;border-radius:9px}
.icon-btn{border:none;background:rgba(148,163,184,.14);border-radius:10px;width:34px;height:34px;cursor:pointer;display:none;align-items:center;justify-content:center;font-size:1rem;transition:all .2s}
.icon-btn:hover{background:rgba(148,163,184,.28)}
.chip{display:inline-flex;align-items:center;background:var(--chip);color:var(--chip-tx);border-radius:999px;padding:.14rem .6rem;font-size:.74rem;font-weight:600}
.pill{border-radius:999px;padding:.1rem .55rem;font-size:.7rem;font-weight:700}
.pill.ok{background:#d1fae5;color:#059669}.pill.warn{background:#fef3c7;color:#b45309}.pill.bad{background:#fee2e2;color:#dc2626}
[data-theme="dark"] .pill.ok{background:rgba(16,185,129,.15);color:#34d399}
[data-theme="dark"] .pill.warn{background:rgba(245,158,11,.15);color:#fbbf24}
[data-theme="dark"] .pill.bad{background:rgba(239,68,68,.15);color:#f87171}

.table{width:100%;border-collapse:collapse}
.table th{font-size:.78rem;color:var(--tx3);text-align:left;font-weight:600;padding:.5rem .6rem;border-bottom:1px solid rgba(148,163,184,.25);letter-spacing:.03em}
.table td{padding:.6rem;border-bottom:1px dashed rgba(148,163,184,.18);font-size:.9rem}
.table tr:hover td{background:rgba(148,163,184,.07)}
.table a{color:var(--accent);text-decoration:none;font-weight:600}

/* Toast / Modal */
.toast-wrap{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:99;display:flex;flex-direction:column;gap:.5rem;align-items:center}
.toast{padding:.65rem 1.15rem;border-radius:14px;color:#fff;font-weight:600;font-size:.9rem;animation:pageIn .3s var(--ease);box-shadow:0 10px 30px -8px rgba(0,0,0,.4);max-width:90vw}
.toast.ok{background:linear-gradient(120deg,#059669,#10b981)}
.toast.bad{background:linear-gradient(120deg,#dc2626,#ef4444)}
.toast.warn{background:linear-gradient(120deg,#b45309,#f59e0b)}
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);backdrop-filter:blur(6px);z-index:90;display:flex;align-items:center;justify-content:center;animation:pageIn .22s}
.modal{background:var(--glass);backdrop-filter:var(--blur);border:1px solid var(--glass-brd);border-radius:var(--radius);padding:1.35rem;max-width:440px;width:92vw;max-height:82vh;overflow:auto;box-shadow:0 30px 80px -20px rgba(0,0,0,.45);animation:popIn .32s var(--ease)}
@keyframes popIn{from{opacity:0;transform:scale(.92) translateY(14px)}to{opacity:1;transform:none}}

/* 词卡/词典 */
.word-head{display:flex;align-items:baseline;gap:.8rem;flex-wrap:wrap}
.word-title{font-size:2.1rem;font-weight:800;letter-spacing:-.03em}
.phonetic{color:var(--accent);font-weight:600;font-size:1rem}
.speak-btn{width:38px;height:38px;border-radius:50%;border:none;cursor:pointer;background:linear-gradient(120deg,var(--accent),var(--accent2));color:#fff;font-size:1.05rem;box-shadow:0 8px 20px -8px rgba(91,124,250,.7);transition:transform .2s}
.speak-btn:hover{transform:scale(1.08)}
.def{white-space:pre-wrap;font-size:.95rem;color:var(--tx2)}
.sense{padding:.7rem .9rem;border-radius:12px;background:rgba(148,163,184,.09);margin-bottom:.5rem;border-left:3px solid var(--accent)}
.tag-exam{background:linear-gradient(120deg,rgba(91,124,250,.15),rgba(139,92,246,.15));color:var(--chip-tx)}
.exam-list{display:flex;gap:.35rem;flex-wrap:wrap}

/* 训练 */
.train-wrap{max-width:640px;margin:0 auto}
.train-card{padding:2.2rem 1.8rem;text-align:center;border-radius:var(--radius)}
.train-word{font-size:2.5rem;font-weight:800;letter-spacing:-.03em;margin:.6rem 0}
.train-def{font-size:1.25rem;margin:.8rem 0;color:var(--tx)}
.train-hint{font-size:.85rem;color:var(--tx3)}
.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:.7rem;margin-top:1.3rem}
.choice-grid .btn{padding:.9rem;font-weight:600;font-size:.95rem}
.choice-grid .btn.correct{background:linear-gradient(120deg,#059669,#10b981)!important;color:#fff}
.choice-grid .btn.wrong{background:linear-gradient(120deg,#dc2626,#ef4444)!important;color:#fff}
.prog{height:8px;border-radius:6px;background:rgba(148,163,184,.2);overflow:hidden;margin-bottom:1.1rem}
.prog i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .5s var(--ease)}
.spell-input{font-size:1.5rem;text-align:center;letter-spacing:.15em;font-weight:700}
.flash-card{perspective:1200px;cursor:pointer}
.flash-inner{position:relative;transition:transform .6s var(--ease);transform-style:preserve-3d;min-height:230px;border-radius:var(--radius)}
.flash-card.flip .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;backface-visibility:hidden;border-radius:var(--radius);padding:1.4rem}
.flash-back{transform:rotateY(180deg)}
.ok-bad{display:flex;gap:.8rem;justify-content:center;margin-top:1.1rem}

/* 手写 */
.hw-cells{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.hw-cell{position:relative;width:86px;height:86px;border-radius:16px;background:rgba(255,255,255,.7);border:1.6px solid rgba(148,163,184,.4);overflow:hidden;transition:all .25s var(--ease)}
[data-theme="dark"] .hw-cell{background:rgba(15,23,42,.5)}
.hw-cell.active{border-color:var(--accent);box-shadow:var(--ring);transform:scale(1.04)}
.hw-cell.recognized{border-color:var(--ok)}
.hw-cell canvas{width:100%;height:100%;touch-action:none;cursor:crosshair}
.cell-idx{position:absolute;top:4px;left:7px;font-size:.66rem;color:var(--tx3);font-weight:700;z-index:2}
.hw-actions{display:flex;gap:.7rem;justify-content:center;margin-top:1.1rem;flex-wrap:wrap}
.hw-result{margin-top:1rem;text-align:center}
.hw-word{font-size:1.8rem;font-weight:800;letter-spacing:.1em}

/* 抽屉/底部导航 */
.bottom-nav{display:none;position:fixed;bottom:10px;left:10px;right:10px;z-index:80;border-radius:18px;padding:.4rem;justify-content:space-around}
.bottom-nav a{display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--tx2);text-decoration:none;font-size:.62rem;padding:.4rem .7rem;border-radius:12px}
.bottom-nav a.active{color:var(--accent);background:var(--chip);font-weight:700}

/* 分享卡 */
.share-banner{border-radius:14px;padding:.85rem 1rem;background:linear-gradient(120deg,rgba(91,124,250,.12),rgba(139,92,246,.12));border:1px dashed rgba(91,124,250,.45)}
.share-url{font-family:ui-monospace,monospace;font-size:.8rem;user-select:all;color:var(--accent);word-break:break-all}

/* 管理端 */
.adm-tabs{display:flex;gap:.45rem;overflow-x:auto;padding-bottom:.3rem;margin-bottom:1rem;scrollbar-width:none}
.adm-tabs::-webkit-scrollbar{display:none}
.adm-tab{padding:.45rem .95rem;border-radius:999px;font-size:.85rem;font-weight:600;color:var(--tx2);background:rgba(148,163,184,.12);cursor:pointer;border:none;white-space:nowrap;transition:all .25s}
.adm-tab.active{color:#fff;background:linear-gradient(120deg,var(--accent),var(--accent2));box-shadow:0 6px 16px -6px rgba(91,124,250,.6)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:.3rem .9rem;font-size:.86rem}
.kv b{color:var(--tx3);font-weight:500}

@media(max-width:900px){
  .sidebar{display:none}
  .menu-btn{display:inline-flex}
  .bottom-nav{display:flex}
  html{font-size:14px}
  .page{padding:.9rem .85rem 6rem}
  .choice-grid{grid-template-columns:1fr}
  .bento{grid-template-columns:1fr 1fr}
}
@media(max-width:520px){
  .modal{padding:1rem}
  .hw-cell{width:70px;height:70px}
  .train-word{font-size:2rem}
}
.drawer-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:70;animation:pageIn .2s}
.drawer{position:fixed;top:0;bottom:0;left:0;width:250px;z-index:71;padding:1.1rem .9rem;border-radius:0 20px 20px 0;animation:drawerIn .28s var(--ease);display:flex;flex-direction:column}
@keyframes drawerIn{from{transform:translateX(-100%)}to{transform:none}}
.skel{background:linear-gradient(90deg,rgba(148,163,184,.15) 25%,rgba(148,163,184,.3) 50%,rgba(148,163,184,.15) 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:10px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
@media print{.sidebar,.topbar,.bottom-nav{display:none!important}}

/* 辅助布局类（v19.1 补齐） */
.spread{display:flex;align-items:center;justify-content:space-between;gap:.8rem;flex-wrap:wrap;margin-bottom:.9rem}
.grid2{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.bento .b4{grid-column:span 4}.bento .b8{grid-column:span 8}
@media(max-width:1000px){.bento .b4{grid-column:span 2}.bento .b8{grid-column:span 4}}
@media(max-width:600px){.bento .b4,.bento .b8{grid-column:span 2}}
.hoverable{cursor:pointer}
.table-wrap{overflow-x:auto}
.quiz-opt{width:100%;text-align:left;padding:.8rem 1rem;border-radius:12px;background:rgba(148,163,184,.1);font-weight:600;transition:all .2s;border:1px solid transparent}
.quiz-opt:hover{border-color:var(--accent);background:rgba(91,124,250,.08)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.bento .b1{grid-column:span 1}.bento .b6{grid-column:span 6}
@media(max-width:1000px){.bento .b6{grid-column:span 2}}