/* ============================================================
   WordQuest 全部样式
   ============================================================ */
:root {
  --bg: #0a0a0f;
  --bg-card: #14141c;
  --bg-card-hover: #1a1a26;
  --accent: #00ff9d;
  --accent-dim: #00cc7a;
  --accent-glow: rgba(0,255,157,0.15);
  --danger: #ff4757;
  --warning: #ffa502;
  --gold: #ffd700;
  --text: #e8e8f0;
  --text-dim: #6b6b80;
  --border: #2a2a3a;
  --radius: 14px;
  --font: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Consolas', 'Menlo', monospace;
}
* { margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html, body { height:100%; overflow-x:hidden; }
/* 固定窗口：桌面/平板居中成手机竖屏形态，像 App 一样 */
body { background: var(--bg); color: var(--text); font-family: var(--font); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; position: relative; display:flex; justify-content:center; }
body::before { content:''; position: fixed; top:0; left:0; right:0; bottom:0; background: radial-gradient(ellipse at 20% 0%, rgba(0,255,157,0.06), transparent 50%), radial-gradient(ellipse at 80% 100%, rgba(0,120,255,0.05), transparent 50%); pointer-events: none; z-index: 0; }
#app { position:relative; z-index:1; min-height:100vh; display:flex; flex-direction:column; width:100%; max-width:420px; box-shadow: 0 0 80px rgba(0,255,157,0.04); }
.navbar { display:flex; align-items:center; justify-content:space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); background: rgba(10,10,15,0.9); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); position: sticky; top:0; z-index:100; }
.nav-brand { display:flex; align-items:center; gap:8px; font-weight:700; font-size:18px; letter-spacing:1px; }
.nav-brand .logo { width:28px; height:28px; background:var(--accent); border-radius:6px; display:flex; align-items:center; justify-content:center; font-size:16px; color:#000; font-weight:900; box-shadow: 0 0 12px var(--accent-glow); }
.nav-brand .name { color:var(--accent); text-shadow: 0 0 8px var(--accent-glow); }
.nav-right { display:flex; align-items:center; gap:10px; }
.nav-user { font-size:12px; color:var(--text-dim); }
.nav-user .uname { color:var(--accent); font-weight:600; }
.btn-logout { background:none; border:1px solid var(--border); color:var(--text-dim); padding:5px 12px; border-radius:8px; font-family:var(--font); font-size:12px; cursor:pointer; transition: all .2s; }
.btn-logout:active { border-color:var(--danger); color:var(--danger); }
.page { display:none; flex:1; padding:16px 14px 80px; animation: fadeIn .3s ease; }
.page.active { display:block; }
.page.scrollable { height:calc(100vh - 56px); height:calc(100dvh - 56px); overflow-y:auto; -webkit-overflow-scrolling:touch; }
@keyframes fadeIn { from{opacity:0; transform:translateY(8px);} to{opacity:1; transform:translateY(0);} }
.auth-wrap { max-width:360px; margin:0 auto; padding-top:20px; }
.auth-card { background: var(--bg-card); border:1px solid var(--border); border-radius: var(--radius); padding: 24px 20px; }
.auth-title { font-size:20px; font-weight:700; text-align:center; margin-bottom:4px; }
.auth-title .hl { color:var(--accent); }
.auth-sub { text-align:center; color:var(--text-dim); font-size:12px; margin-bottom:18px; }
.user-cards { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }
.user-card { background:var(--bg); border:1px solid var(--border); border-radius:12px; padding:14px 10px; text-align:center; cursor:pointer; transition:all .2s; min-width:80px; flex:1; max-width:100px; }
.user-card:active { border-color:var(--accent); box-shadow:0 0 12px var(--accent-glow); transform:scale(.95); }
.user-avatar { width:36px; height:36px; border-radius:50%; background:var(--accent); color:#000; display:flex; align-items:center; justify-content:center; font-size:18px; font-weight:700; margin:0 auto 6px; }
.user-name { font-size:13px; color:var(--text); word-break:break-all; }
.field { margin-bottom:12px; }
.field label { display:block; font-size:12px; color:var(--text-dim); margin-bottom:6px; text-transform:uppercase; letter-spacing:1px; }
.field input { width:100%; background:var(--bg); border:1px solid var(--border); border-radius:10px; padding:10px 14px; color:var(--text); font-family:var(--font); font-size:15px; transition: border .2s; }
.field input:focus { outline:none; border-color:var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.btn { width:100%; padding:13px; border:none; border-radius:10px; font-family:var(--font); font-size:15px; font-weight:600; cursor:pointer; transition: all .2s; display:flex; align-items:center; justify-content:center; gap:8px; }
.btn-primary { background:var(--accent); color:#000; box-shadow: 0 0 16px var(--accent-glow); }
.btn-primary:active { transform:scale(.97); background:var(--accent-dim); }
.btn-secondary { background:var(--bg-card); border:1px solid var(--border); color:var(--text); }
.btn-secondary:active { border-color:var(--accent); }
.auth-toggle { text-align:center; margin-top:18px; font-size:13px; color:var(--text-dim); }
.auth-toggle a { color:var(--accent); cursor:pointer; text-decoration:none; }
.auth-error { color:var(--danger); font-size:13px; text-align:center; margin-top:12px; min-height:18px; }
.dash-header { text-align:center; margin-bottom:8px; flex-shrink:0; }
.dash-header .greeting { font-size:12px; color:var(--text-dim); }
.dash-header .username { font-size:20px; font-weight:700; color:var(--accent); text-shadow:0 0 12px var(--accent-glow); margin-top:2px; }
.stats-grid { display:grid; grid-template-columns:1fr 1fr 1fr 1fr; gap:6px; margin-bottom:8px; flex-shrink:0; }
.stat-card { background:var(--bg-card); border:1px solid var(--border); border-radius:10px; padding:8px 4px; text-align:center; position:relative; overflow:hidden; }
.stat-card::before { content:''; position:absolute; top:0; left:0; right:0; height:2px; background:linear-gradient(90deg, transparent, var(--accent), transparent); }
.stat-card .label { font-size:9px; color:var(--text-dim); text-transform:uppercase; letter-spacing:0.5px; }
.stat-card .value { font-size:18px; font-weight:700; margin-top:2px; }
.value.green { color: var(--accent); }
.value.gold { color: var(--gold); }
.value.blue { color: #4da3ff; }
.value.purple { color: #bf5af2; }
.section-title { font-size:11px; color:var(--text-dim); text-transform:uppercase; letter-spacing:1px; margin-bottom:6px; display:flex; align-items:center; gap:6px; }
.section-title::before { content:''; width:3px; height:12px; background:var(--accent); border-radius:2px; }
.reward-card { background: linear-gradient(135deg, #14141c, #1a1a2a); border:1px solid var(--border); border-radius:12px; padding:10px 12px; margin-bottom:8px; }
.reward-intro { font-size:11px; color:var(--text-dim); margin-bottom:10px; }
.tier-list { display:flex; flex-direction:column; gap:6px; }
.tier { display:flex; align-items:center; justify-content:space-between; padding:8px 10px; border-radius:8px; border:1px solid var(--border); background:var(--bg); transition: all .2s; }
.tier.current { border-color:var(--accent); box-shadow:0 0 10px var(--accent-glow); }
.tier .tname { display:flex; align-items:center; gap:6px; font-size:13px; }
.tier .tbadge { width:20px; height:20px; border-radius:50%; display:flex; align-items:center; justify-content:center; }
.tier .treq { font-size:10px; color:var(--text-dim); }
.tier .treward { font-size:11px; color:var(--accent); font-weight:600; max-width:140px; text-align:right; }
.history-list { display:flex; flex-direction:column; gap:4px; }
.history-item { display:flex; justify-content:space-between; align-items:center; background:var(--bg-card); border:1px solid var(--border); border-radius:8px; padding:5px 8px; }
.history-item .hdate { font-size:11px; color:var(--text-dim); }
.history-item .hscore { font-size:12px; font-weight:700; }
.history-item .hscore.pass { color:var(--accent); }
.history-item .hscore.fail { color:var(--danger); }
.empty-hint { text-align:center; color:var(--text-dim); font-size:11px; padding:8px; }
#app { height:100vh; height:100dvh; }
.page { padding:12px 14px; }
.page.quiz-page { height:calc(100vh - 56px); height:calc(100dvh - 56px); display:flex; flex-direction:column; overflow:hidden; padding:10px 14px 14px; }
.quiz-topbar { display:flex; align-items:center; gap:12px; margin-bottom:10px; flex-shrink:0; }
.quiz-diff { font-size:10px; padding:3px 9px; border-radius:10px; border:1px solid var(--border); color:var(--text-dim); white-space:nowrap; flex-shrink:0; }
.quiz-diff.easy { color:var(--accent); border-color:var(--accent); }
.quiz-diff.normal { color:var(--warning); border-color:var(--warning); }
.quiz-diff.hard { color:var(--danger); border-color:var(--danger); }
.progress-bar { flex:1; height:6px; background:var(--border); border-radius:3px; overflow:hidden; }
.progress-fill { height:100%; background:linear-gradient(90deg, var(--accent-dim), var(--accent)); border-radius:3px; transition: width .4s ease; box-shadow: 0 0 8px var(--accent-glow); }
.quiz-counter { font-size:13px; color:var(--text-dim); white-space:nowrap; }
.quiz-counter .cur { color:var(--accent); font-weight:700; font-size:16px; }
.day-counter { font-size:11px; color:var(--text-dim); white-space:nowrap; margin-left:auto; }
.day-counter .cur { color:var(--gold); font-weight:700; font-size:13px; }
.quiz-card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:16px 16px; text-align:center; margin-bottom:8px; display:flex; flex-direction:column; flex:1; min-height:0; }
.quiz-cat { font-size:11px; color:var(--accent-dim); text-transform:uppercase; letter-spacing:2px; margin-bottom:8px; flex-shrink:0; }
.quiz-meaning { font-size:16px; color:var(--text); margin-bottom:16px; line-height:1.4; flex-shrink:0; }
.quiz-meaning::before { content:'['; color:var(--accent-dim); margin-right:2px; }
.quiz-meaning::after { content:']'; color:var(--accent-dim); margin-left:2px; }
.pronounce-row { display:flex; justify-content:center; margin-bottom:12px; flex-shrink:0; }
.btn-pronounce { background:var(--bg); border:1px solid var(--border); border-radius:20px; padding:6px 16px; color:var(--accent); font-family:var(--font); font-size:13px; cursor:pointer; transition:all .2s; display:flex; align-items:center; gap:6px; }
.btn-pronounce:active { border-color:var(--accent); box-shadow:0 0 8px var(--accent-glow); transform:scale(.95); }
.word-display { font-size:22px; font-weight:700; letter-spacing:1px; margin-bottom:12px; display:flex; justify-content:center; gap:3px; flex-wrap:wrap; padding:2px 0 6px; flex-shrink:0; max-width:100%; }
.letter-slot { display:inline-flex; align-items:center; justify-content:center; min-width:22px; height:34px; border-bottom:2px solid var(--border); transition: all .2s; color:var(--text); font-size:18px; }
.letter-slot.filled { border-color:var(--text-dim); }
.letter-slot.word-gap { min-width:14px; border-bottom:none; }
.letter-input { width:28px; height:38px; background:var(--bg); border:2px solid var(--accent); border-radius:6px; color:var(--accent); font-family:var(--font); font-size:18px; font-weight:700; text-align:center; text-transform:lowercase; padding:0; outline:none; caret-color:var(--accent); transition: all .15s; }
.letter-input:focus { box-shadow:0 0 0 3px var(--accent-glow); border-color:var(--accent); }
.letter-input:disabled { opacity:0.65; }
.letter-input.correct { color:var(--accent); border-color:var(--accent); background:rgba(0,255,157,0.08); }
.letter-input.wrong { color:var(--danger); border-color:var(--danger); background:rgba(255,71,87,0.08); }
.quiz-spacer { flex:1; min-height:4px; }
.quiz-actions { display:flex; gap:10px; flex-shrink:0; }
.quiz-actions .btn { flex:1; padding:11px; font-size:14px; }
.feedback { min-height:20px; text-align:center; font-size:13px; margin-top:6px; transition: all .2s; flex-shrink:0; }
.feedback.correct { color:var(--accent); }
.feedback.wrong { color:var(--danger); }
.answer-reveal { background:var(--bg); border:1px solid var(--border); border-radius:8px; padding:8px 12px; margin-top:6px; font-size:12px; display:none; flex-shrink:0; }
.answer-reveal.show { display:block; animation: fadeIn .3s; }
.answer-reveal .ar-label { color:var(--text-dim); }
.answer-reveal .ar-word { color:var(--accent); font-weight:700; font-size:14px; }
.result-wrap { max-width:400px; margin:0 auto; padding-top:20px; text-align:center; }
.result-icon { font-size:48px; margin-bottom:8px; display:flex; justify-content:center; }
.result-title { font-size:26px; font-weight:700; margin-bottom:4px; }
.result-title.pass { color:var(--accent); text-shadow:0 0 16px var(--accent-glow); }
.result-title.fail { color:var(--danger); }
.result-sub { color:var(--text-dim); font-size:13px; margin-bottom:16px; }
.result-stats { display:grid; grid-template-columns:1fr 1fr 1fr; gap:10px; margin-bottom:16px; }
.result-stat { background:var(--bg-card); border:1px solid var(--border); border-radius:12px; padding:12px 6px; }
.result-stat .rs-val { font-size:20px; font-weight:700; }
.result-stat .rs-label { font-size:11px; color:var(--text-dim); text-transform:uppercase; margin-top:4px; }
.result-points { background: linear-gradient(135deg, rgba(0,255,157,0.1), rgba(0,120,255,0.05)); border:1px solid var(--accent); border-radius:12px; padding:14px; margin-bottom:16px; }
.result-points .rp-label { font-size:12px; color:var(--text-dim); }
.result-points .rp-val { font-size:28px; font-weight:700; color:var(--accent); }
.result-actions { display:flex; flex-direction:column; gap:10px; }
.tabbar { position:fixed; bottom:0; left:50%; transform:translateX(-50%); width:100%; max-width:420px; display:flex; background:rgba(10,10,15,0.95); backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px); border-top:1px solid var(--border); z-index:100; padding-bottom: env(safe-area-inset-bottom, 0); }
.tab { flex:1; padding:10px 0 8px; text-align:center; cursor:pointer; transition: all .2s; display:flex; flex-direction:column; align-items:center; gap:3px; }
.tab-icon { font-size:20px; opacity:0.5; transition: all .2s; }
.tab-label { font-size:10px; color:var(--text-dim); letter-spacing:0.5px; }
.tab.active .tab-icon { opacity:1; }
.tab.active .tab-label { color:var(--accent); }
.edit-rewards .tier-edit { background:var(--bg-card); border:1px solid var(--border); border-radius:10px; padding:14px; margin-bottom:10px; }
.tier-edit-header { display:flex; align-items:center; gap:10px; margin-bottom:10px; }
.tier-edit-header .tbadge { width:28px; height:28px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:14px; font-weight:700; }
.tier-edit-header .tname { font-size:15px; font-weight:600; }
.tier-edit-header .treq { margin-left:auto; font-size:12px; color:var(--text-dim); }
.tier-edit input, .tier-edit select { width:100%; background:var(--bg); border:1px solid var(--border); border-radius:8px; padding:10px 12px; color:var(--text); font-family:var(--font); font-size:14px; }
.tier-edit input:focus, .tier-edit select:focus { outline:none; border-color:var(--accent); }
.tier-edit input[type="color"] { width:100%; height:40px; padding:2px 4px; }
.tier-edit label { display:block; font-size:10px; color:var(--text-dim); margin:8px 0 4px; }
.admin-grid { display:grid; grid-template-columns:1fr 1fr; gap:0 10px; }
.admin-grid .full { grid-column:1 / -1; }
.admin-gate { background:var(--bg-card); border:1px solid var(--border); border-radius:10px; padding:14px; margin-bottom:12px; }
.toast { position:fixed; top:66px; left:50%; transform:translateX(-50%); background:var(--bg-card); border:1px solid var(--accent); border-radius:10px; padding:8px 16px; color:var(--accent); font-size:13px; z-index:999; opacity:0; transition: opacity .3s; pointer-events:none; box-shadow: 0 0 16px var(--accent-glow); max-width:360px; width:max-content; }
.toast.show { opacity:1; }

/* ---- 难度选择弹层 ---- */
.diff-overlay { position:fixed; inset:0; background:rgba(5,5,10,0.85); backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px); display:flex; align-items:center; justify-content:center; z-index:500; }
.diff-panel { width:calc(100% - 48px); max-width:360px; background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:20px 18px; }
.diff-title { font-size:17px; font-weight:700; text-align:center; margin-bottom:14px; color:var(--text); }
.diff-title .hl { color:var(--accent); }
.diff-card { border:1px solid var(--border); border-radius:12px; padding:12px 14px; margin-bottom:10px; cursor:pointer; transition:all .2s; background:var(--bg); }
.diff-card:active { border-color:var(--accent); box-shadow:0 0 12px var(--accent-glow); transform:scale(.98); }
.diff-card .dc-name { font-size:15px; font-weight:700; }
.diff-card .dc-desc { font-size:11px; color:var(--text-dim); margin-top:4px; }
.diff-card .dc-mul { font-size:10px; color:var(--gold); margin-top:2px; }
.diff-card.easy .dc-name { color:var(--accent); }
.diff-card.normal .dc-name { color:var(--warning); }
.diff-card.hard .dc-name { color:var(--danger); }
.diff-close { margin-top:6px; }

/* ---- 单词出现统计（题目下方）---- */
.word-stats { font-size:11px; color:var(--text-dim); text-align:center; margin:-8px 0 10px; flex-shrink:0; }
.word-stats .ws-a { color:var(--gold); font-weight:700; }
.word-stats .ws-c { color:var(--accent); font-weight:700; }
.word-stats .ws-e { color:var(--danger); font-weight:700; }

/* ---- 跳过时中央正确答案弹层 ---- */
.ac-overlay { position:fixed; inset:0; z-index:600; display:flex; align-items:center; justify-content:center; background:rgba(5,5,10,0.72); backdrop-filter:blur(4px); -webkit-backdrop-filter:blur(4px); transition: opacity .6s ease; }
.ac-overlay.fadeout { opacity:0; }
.ac-box { text-align:center; padding:30px 26px; background:var(--bg-card); border:1px solid var(--accent); border-radius:var(--radius); box-shadow:0 0 44px var(--accent-glow); max-width:340px; width:calc(100% - 60px); }
.ac-label { font-size:12px; color:var(--text-dim); letter-spacing:3px; margin-bottom:12px; }
.ac-word { font-size:44px; font-weight:900; color:var(--accent); letter-spacing:2px; text-shadow:0 0 22px var(--accent-glow); word-break:break-all; line-height:1.2; }
.ac-meaning { font-size:16px; color:var(--text); margin-top:12px; }
.ac-hold { margin:22px auto 4px; width:116px; height:116px; border-radius:50%; border:2px solid var(--accent); background:rgba(0,255,157,0.08); color:var(--accent); font-family:var(--font); font-size:13px; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:4px; cursor:pointer; user-select:none; -webkit-user-select:none; touch-action:none; transition: all .15s; }
.ac-hold:active, .ac-hold.holding { background:var(--accent); color:#000; transform:scale(1.06); box-shadow:0 0 32px var(--accent-glow); }
.ac-hold-icon { display:flex; }

/* ---- 挑战关卡（AI 出题）---- */
.ch-loading { flex:1; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; }
.ch-card { overflow-y:auto; }
.ch-target-word { font-size:28px; font-weight:900; color:var(--accent); text-align:center; margin-bottom:4px; text-shadow:0 0 16px var(--accent-glow); word-break:break-all; line-height:1.3; }
.ch-hint { font-size:11px; color:var(--text-dim); text-align:center; margin-bottom:12px; }
.ch-sentences { text-align:left; }
.ch-sentence { background:var(--bg); border:1px solid var(--border); border-radius:8px; padding:9px 12px; margin-bottom:8px; font-size:14px; line-height:1.5; color:var(--text); }
.ch-options { display:flex; flex-direction:column; gap:8px; margin-top:6px; }
.ch-option { display:flex; align-items:flex-start; gap:10px; background:var(--bg); border:1px solid var(--border); border-radius:10px; padding:11px 12px; cursor:pointer; transition:all .15s; font-size:14px; }
.ch-option:active { border-color:var(--accent); transform:scale(.99); }
.ch-option.correct { border-color:var(--accent); background:rgba(0,255,157,0.08); color:var(--accent); }
.ch-option.wrong { border-color:var(--danger); background:rgba(255,71,87,0.08); color:var(--danger); }
.ch-opt-key { width:22px; height:22px; border-radius:50%; border:1px solid var(--border); display:flex; align-items:center; justify-content:center; font-size:12px; color:var(--text-dim); flex-shrink:0; margin-top:2px; }
.ch-option.correct .ch-opt-key { border-color:var(--accent); color:var(--accent); }
.ch-option.wrong .ch-opt-key { border-color:var(--danger); color:var(--danger); }
.ch-opt-text { flex:1; word-break:break-word; line-height:1.5; }
.ch-opt-mark { display:flex; flex-shrink:0; margin-top:2px; }
.ch-fillwords { font-size:11px; color:var(--text-dim); text-align:center; margin-top:8px; line-height:1.8; }
.ch-explanation { background:var(--bg); border:1px solid var(--border); border-radius:10px; padding:12px 14px; margin-top:10px; }
.ch-exp-title { font-size:12px; font-weight:700; color:var(--accent); margin-bottom:6px; display:flex; align-items:center; gap:6px; }
.ch-exp-body { font-size:12px; color:var(--text); line-height:1.8; white-space:pre-line; word-break:break-word; }

/* ---- 退出程序按钮 ---- */
.btn-exit { border-color:var(--danger); color:var(--danger); }
.btn-exit:active { background:rgba(255,71,87,0.1); }

@media (max-width:360px) { .word-display { font-size:18px; letter-spacing:0px; } .stat-card .value { font-size:24px; } }