/* ============================================================
   中西学舍 · Design System v2（对齐大厂学习类产品）
   - 统一色阶/阴影/间距；- 暗色模式；- 微动效；- SVG图标
   ============================================================ */
:root{
  --brand:#10a37f; --brand-2:#0c8a6c; --brand-soft:#e6f5f0;
  --accent:#ff9f43; --danger:#ef4444; --ok:#22c55e; --gold:#fbbf24;
  --text:#1f2937; --text-2:#6b7280; --text-3:#9ca3af;
  --bg:#f6f8f7; --card:#ffffff; --border:#e8ecea;
  --shadow-1:0 1px 2px rgba(16,24,20,.05);
  --shadow-2:0 4px 16px rgba(16,24,20,.08);
  --r-lg:20px; --r-md:14px; --r-sm:10px;
}
@media (prefers-color-scheme: dark){
  :root{
    --brand:#34d399; --brand-2:#10b981; --brand-soft:#0e2e26;
    --text:#f3f4f6; --text-2:#9ca3af; --text-3:#6b7280;
    --bg:#111817; --card:#1b2422; --border:#2a3634;
    --shadow-1:0 1px 2px rgba(0,0,0,.3);
    --shadow-2:0 4px 16px rgba(0,0,0,.4);
  }
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.65;
  padding-top:calc(56px + env(safe-area-inset-top));padding-bottom:calc(66px + env(safe-area-inset-bottom));
  font-size:15px;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
main{animation:fadeIn .28s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.03)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
@keyframes flame{0%,100%{transform:scale(1) rotate(-2deg)}50%{transform:scale(1.12) rotate(2deg)}}

/* ===== 顶栏 ===== */
#topbar{
  position:fixed;top:0;left:0;right:0;z-index:50;height:56px;
  padding-top:env(safe-area-inset-top);
  display:flex;align-items:center;padding-left:12px;padding-right:12px;gap:8px;
  background:color-mix(in srgb, var(--card) 78%, transparent);
  -webkit-backdrop-filter:saturate(1.6) blur(14px);backdrop-filter:saturate(1.6) blur(14px);
  border-bottom:1px solid var(--border);
}
.top-title{flex:1;text-align:center;font-size:16.5px;font-weight:700;letter-spacing:.3px}
.icon-btn{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--text-2)}
.icon-btn:active{background:var(--border)}
.streak-badge{
  display:flex;align-items:center;gap:4px;background:var(--brand-soft);color:var(--brand);
  border-radius:999px;padding:5px 11px;font-size:13px;font-weight:800;
}
.streak-badge .flame{display:inline-block;animation:flame 1.6s ease-in-out infinite}

/* ===== 底导航（SVG 图标）===== */
#tabbar{
  position:fixed;bottom:0;left:0;right:0;z-index:50;height:64px;
  background:color-mix(in srgb, var(--card) 85%, transparent);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-top:1px solid var(--border);display:flex;padding-bottom:env(safe-area-inset-bottom);
}
#tabbar button{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  font-size:10.5px;color:var(--text-3);font-weight:600;transition:color .15s;
}
#tabbar button svg{width:23px;height:23px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
#tabbar button.active{color:var(--brand)}
#tabbar button.active svg{fill:var(--brand-soft)}

/* ===== 通用 ===== */
#view{max-width:640px;margin:0 auto;padding:14px 16px 34px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--r-lg);padding:18px;margin-bottom:14px;box-shadow:var(--shadow-1)}
.card h3{font-size:15.5px;font-weight:800;margin-bottom:10px;display:flex;align-items:center;gap:7px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  background:var(--brand);color:#fff;border-radius:999px;padding:12px 20px;
  font-size:14.5px;font-weight:700;box-shadow:0 3px 10px color-mix(in srgb,var(--brand) 35%,transparent);
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:active{transform:scale(.955);box-shadow:0 1px 4px color-mix(in srgb,var(--brand) 30%,transparent)}
.btn.ghost{background:var(--brand-soft);color:var(--brand);box-shadow:none}
.btn.warn{background:var(--accent);box-shadow:0 3px 10px rgba(255,159,67,.35)}
.btn.block{width:100%}
.btn:disabled{opacity:.4}
.tag{display:inline-block;background:var(--brand-soft);color:var(--brand);border-radius:7px;padding:2px 9px;font-size:12px;font-weight:700;margin-right:6px}
.progress{height:7px;background:var(--border);border-radius:99px;overflow:hidden;margin-top:8px}
.progress>i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2));border-radius:99px;transition:width .5s cubic-bezier(.2,.8,.2,1)}
.muted{color:var(--text-2);font-size:13px}
.divider{height:1px;background:var(--border);margin:12px 0}

/* ===== 首页 Hero ===== */
.hero{
  background:linear-gradient(135deg,var(--brand) 0%,var(--brand-2) 60%,#0b6b52 100%);
  color:#fff;border-radius:24px;padding:22px 20px 20px;margin-bottom:14px;
  position:relative;overflow:hidden;box-shadow:0 8px 24px rgba(16,163,127,.28);
}
.hero::before{content:"";position:absolute;right:-46px;top:-46px;width:170px;height:170px;border-radius:50%;background:rgba(255,255,255,.09)}
.hero::after{content:"";position:absolute;right:-10px;bottom:-64px;width:130px;height:130px;border-radius:50%;background:rgba(255,255,255,.07)}
.hero h2{font-size:20px;font-weight:800;letter-spacing:.3px}
.hero p{font-size:12.5px;opacity:.88;margin-top:2px}
.hero-row{display:flex;align-items:center;gap:20px;margin-top:14px}
.hero .stats{display:flex;gap:20px;flex:1}
.hero .stats b{font-size:22px;display:block;line-height:1.15;font-weight:800}
.hero .stats span{font-size:11px;opacity:.82}
.ring-wrap{position:relative;width:74px;height:74px;flex:none}
.ring-wrap svg{transform:rotate(-90deg)}
.ring-wrap .ring-bg{stroke:rgba(255,255,255,.22)}
.ring-wrap .ring-fg{stroke:#fff;transition:stroke-dashoffset 1s cubic-bezier(.2,.8,.2,1)}
.ring-wrap .ring-txt{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800}
.hero-done{background:linear-gradient(135deg,#22c55e,#15803d);box-shadow:0 8px 24px rgba(34,197,94,.28)}

/* ===== 科目卡片 ===== */
.subject-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.sub-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:15px;position:relative;text-align:left;box-shadow:var(--shadow-1);
  transition:transform .12s ease;
}
.sub-card:active{transform:scale(.965)}
.sub-card .ico{
  width:42px;height:42px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:21px;margin-bottom:9px;color:#fff;
}
.sub-card b{display:block;font-size:14.5px;font-weight:800;margin-bottom:2px}
.sub-card .muted{font-size:11px;display:block;margin-bottom:2px}
.sub-card .pct{position:absolute;right:14px;top:15px;font-size:12px;font-weight:800;color:var(--brand)}
@media(min-width:640px){.subject-grid{grid-template-columns:repeat(3,1fr)}}

/* ===== 章节手风琴 ===== */
.chapter{background:var(--card);border:1px solid var(--border);border-radius:var(--r-md);margin-bottom:10px;overflow:hidden}
.chapter>button{width:100%;display:flex;align-items:center;gap:10px;padding:15px 16px;text-align:left;font-size:14.5px;font-weight:700}
.chapter .chev{margin-left:auto;color:var(--text-3);transition:transform .2s;flex:none}
.chapter.open .chev{transform:rotate(90deg)}
.chapter .body{display:none;padding:0 16px 15px}
.chapter.open .body{display:block;animation:fadeIn .2s ease}
.section-row{display:flex;align-items:center;gap:8px;padding:11px 0;border-top:1px dashed var(--border);font-size:13.5px}
.section-row .name{flex:1}
.section-row.done .name{color:var(--text-2)}
.section-row.done .name::after{content:" ✓";color:var(--ok);font-weight:800}
.mini-btn{
  background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:6px 13px;
  font-size:12px;font-weight:800;flex:none;transition:transform .12s;
}
.mini-btn:active{transform:scale(.93)}
.mini-btn.quiz{background:#fff4e5;color:#c2660b}

/* ===== 卡片学习 ===== */
.kcard{background:var(--card);border:1px solid var(--border);border-radius:var(--r-lg);padding:22px 20px;margin-bottom:14px;box-shadow:var(--shadow-1)}
.kcard .q{font-size:17px;font-weight:800;line-height:1.55}
.kcard .reveal{background:var(--brand-soft);border-radius:14px;padding:14px 15px;margin-top:12px;font-size:14px;white-space:pre-line;animation:fadeIn .25s ease}
.kcard .reveal b{color:var(--brand)}
.kcard .tip{background:color-mix(in srgb,var(--gold) 12%,var(--card));border-left:4px solid var(--gold);padding:11px 13px;border-radius:10px;margin-top:12px;font-size:13px;white-space:pre-line;animation:fadeIn .25s ease}
.nav-row{display:flex;gap:10px;margin-top:6px}
.nav-row .btn{flex:1}

/* ===== 测验 ===== */
.quiz-progress{height:6px;background:var(--border);border-radius:99px;overflow:hidden;margin-bottom:14px}
.quiz-progress>i{display:block;height:100%;background:var(--brand);border-radius:99px;transition:width .3s}
.quiz-q{font-size:16px;font-weight:800;margin:6px 0 16px;line-height:1.6}
.opt{
  display:block;width:100%;text-align:left;background:var(--card);border:2px solid var(--border);
  border-radius:16px;padding:14px 15px;margin-bottom:11px;font-size:14.5px;font-weight:600;
  transition:border-color .15s, background .15s, transform .12s;
}
.opt:active{transform:scale(.98)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,var(--card));animation:pop .3s ease}
.opt.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 10%,var(--card));animation:shake .3s ease}
.explain{background:var(--bg);border-radius:14px;padding:14px;font-size:13.5px;margin:8px 0;white-space:pre-line;animation:fadeIn .25s ease}
.explain b{color:var(--brand)}
.quiz-top{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;color:var(--text-2);margin-bottom:8px;font-weight:700}
.timer{font-weight:800;color:var(--accent)}

/* ===== 打卡日历 ===== */
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;margin-top:12px}
.cal .d{
  aspect-ratio:1;border-radius:9px;background:var(--border);display:flex;align-items:center;justify-content:center;
  font-size:10px;color:var(--text-2);font-weight:600;
}
.cal .d.on{background:var(--brand);color:#fff;font-weight:800}
.cal .d.today{outline:2.5px solid var(--accent);outline-offset:1px}

/* ===== 病例 ===== */
.story{background:linear-gradient(135deg,#fff8ef,#fdf0e3);border-radius:16px;padding:15px;font-size:14px;margin-bottom:13px;white-space:pre-line}
.case-opt{display:block;width:100%;text-align:left;border:2px solid var(--border);background:var(--card);border-radius:16px;padding:13px 15px;margin-bottom:11px;font-size:14px;font-weight:600;transition:.15s}
.case-opt.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,var(--card));animation:pop .3s ease}
.case-opt.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 10%,var(--card));animation:shake .3s ease}

/* ===== 对战卡 ===== */
.vs-table{width:100%;border-collapse:collapse;font-size:13px;margin-top:8px;display:block;overflow-x:auto;white-space:nowrap;border-radius:12px}
.vs-table th{background:var(--brand-soft);color:var(--brand);font-weight:800}
.vs-table th,.vs-table td{border:1px solid var(--border);padding:8px 10px;text-align:left;white-space:normal}

/* ===== 结果页 ===== */
.result{text-align:center;padding:38px 16px;animation:fadeIn .3s ease}
.result .big{font-size:56px;animation:pop .45s ease}
.result h2{margin:10px 0 4px;font-size:19px;font-weight:800}
.result .score-ring{width:130px;height:130px;margin:14px auto;position:relative}
.result .score-ring svg{transform:rotate(-90deg)}
.result .score-ring .ring-txt{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;color:var(--brand)}

/* ===== 成就徽章 ===== */
.badges{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.badge{
  background:var(--bg);border:1px solid var(--border);border-radius:16px;padding:14px 6px 12px;
  display:flex;flex-direction:column;align-items:center;gap:5px;text-align:center;
}
.badge b{font-size:24px;line-height:1}
.badge>span{font-size:11.5px;font-weight:800;line-height:1.35}
.badge .muted{font-size:10px;font-weight:500}
.badge.locked{opacity:.42;filter:grayscale(1)}
@media(min-width:640px){.badges{grid-template-columns:repeat(6,1fr)}}

/* ===== 空状态 ===== */
.empty{padding:46px 16px;text-align:center}
.empty svg{width:120px;height:120px;opacity:.9}
.empty h2{margin:12px 0 4px;font-size:18px;font-weight:800}
.empty .muted{max-width:280px;margin:0 auto 18px}

/* ===== toast ===== */
#toast{
  position:fixed;left:50%;bottom:96px;transform:translateX(-50%);z-index:99;
  background:rgba(17,24,23,.94);color:#fff;padding:11px 22px;border-radius:999px;font-size:13.5px;font-weight:600;
  opacity:0;pointer-events:none;transition:opacity .25s;max-width:86%;text-align:center;
}
#toast.show{opacity:1}

/* v3：统计条与字号 */
.stat-row{display:flex;align-items:center;gap:8px;padding:5px 0}
.stat-name{width:86px;font-size:12.5px;flex-shrink:0}
.stat-val{width:44px;text-align:right;font-size:12.5px;flex-shrink:0}
.bar{flex:1;height:8px;background:rgba(120,120,120,.18);border-radius:4px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:4px;transition:width .4s}
html[data-fs="s"] #view{zoom:.9}
html[data-fs="l"] #view{zoom:1.14}