/* ===== 主题变量 ===== */
:root {
  --primary: #FF7A45;
  --primary-blue: #4D7FFF;
  --primary-cyan: #36CFC9;
  --primary-purple: #9254DE;
  --bg: #FFF7E6;
  --bg2: #FFFFFF;
  --card: #FFFFFF;
  --text: #2B2B2B;
  --text-sub: #8C8C8C;
  --success: #52C41A;
  --danger: #FF4D4F;
  --warn: #FAAD14;
  --radius: 18px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.14);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--text);
  background: linear-gradient(180deg, #FFF7E6 0%, #FFFFFF 55%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ===== 布局 ===== */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 248px; flex: 0 0 248px; height: 100vh; position: sticky; top: 0;
  background: linear-gradient(180deg, #FF8A4C 0%, #FF7A45 60%, #F2632E 100%);
  color: #fff; display: flex; flex-direction: column; padding: 22px 16px;
  box-shadow: 4px 0 24px rgba(255, 122, 69, 0.25); z-index: 30;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 6px 10px 18px; }
.brand-logo { font-size: 34px; }
.brand-name { font-size: 20px; font-weight: 800; line-height: 1.15; letter-spacing: .5px; }
.nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 14px;
  font-size: 15px; font-weight: 600; color: rgba(255,255,255,.9); cursor: pointer;
  transition: background .18s ease, transform .12s ease;
}
.nav-item:hover { background: rgba(255,255,255,.16); transform: translateX(3px); }
.nav-item.active { background: #fff; color: var(--primary); box-shadow: var(--shadow); }
.nav-ic { font-size: 20px; }
.nav-sep { height: 1px; background: rgba(255,255,255,.25); margin: 10px 6px; }
.sidebar-foot { text-align: center; font-size: 13px; opacity: .85; padding-top: 12px; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px;
  padding: 16px 28px; background: rgba(255,255,255,.82); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,.05);
}
.menu-btn { display: none; border: none; background: transparent; font-size: 24px; color: var(--text); }
.page-title { margin: 0; font-size: 20px; font-weight: 800; background: linear-gradient(90deg, #FF7A45, #9254DE); -webkit-background-clip: text; background-clip: text; color: transparent; }
.view { padding: 26px 28px 60px; max-width: 1080px; width: 100%; margin: 0 auto; }

/* ===== 通用卡片 ===== */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); }

/* ===== 首页 ===== */
.hero { text-align: center; padding: 18px 0 22px; position: relative; }
.hero-emoji { font-size: 56px; animation: float 3s ease-in-out infinite; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.hero-title { font-size: 38px; font-weight: 800; margin-top: 4px; background: linear-gradient(90deg, #FF7A45, #9254DE); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { color: var(--text-sub); font-size: 15px; margin-top: 6px; }
.hero-settings {
  position: absolute; top: 6px; right: 0; font-size: 14px; color: var(--text-sub);
  padding: 8px 16px; border-radius: 999px; background: #fff; box-shadow: var(--shadow); cursor: pointer; transition: transform .12s ease;
}
.hero-settings:hover { transform: scale(1.05); color: var(--primary); }

.stats { display: flex; align-items: center; padding: 22px 12px; margin-bottom: 22px; }
.stat { flex: 1; text-align: center; }
.stat-num { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--text-sub); margin-top: 4px; }
.divider { width: 1px; height: 40px; background: #f0f0f0; }

.goal-bar { margin-bottom: 22px; }
.goal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.goal-text { font-size: 14px; color: #595959; font-weight: 600; }
.goal-pct { font-size: 14px; color: var(--primary); font-weight: 800; }
.goal-track { height: 12px; border-radius: 7px; background: #f0f0f0; overflow: hidden; }
.goal-fill { height: 100%; border-radius: 7px; background: linear-gradient(90deg, #FF7A45, #9254DE); transition: width .5s ease; }

.section-title { font-size: 17px; font-weight: 700; margin: 8px 4px 14px; }
.tip { margin-top: 18px; font-size: 13px; color: var(--text-sub); text-align: center; }

.review { margin-bottom: 14px; }
.review-item { display: flex; align-items: center; padding: 16px 20px; margin-bottom: 12px; cursor: pointer; transition: transform .14s ease, box-shadow .14s ease; }
.review-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.review-emoji { font-size: 38px; margin-right: 16px; }
.review-text { flex: 1; }
.review-en { font-size: 17px; font-weight: 700; }
.review-zh { font-size: 13px; color: var(--text-sub); }
.review-wrong { font-size: 12px; color: #fff; background: var(--danger); border-radius: 999px; padding: 3px 12px; }

.curriculum { padding: 20px 22px 24px; margin-bottom: 22px; }
.cur-head { display: flex; align-items: center; justify-content: space-between; cursor: pointer; }
.cur-title { font-size: 17px; font-weight: 800; }
.cur-arrow { font-size: 20px; color: var(--text-sub); transition: transform .2s ease; }
.cur-arrow.arrow-open { transform: rotate(180deg); }
.cur-body { margin-top: 16px; }
.cur-import { border: 2px dashed var(--primary); color: var(--primary); background: #FFF7E6; border-radius: var(--radius); text-align: center; padding: 16px; font-size: 15px; font-weight: 700; cursor: pointer; transition: transform .14s ease, background .14s ease; }
.cur-import:hover { background: #FFE9D6; transform: scale(1.01); }
.cur-empty { margin-top: 14px; font-size: 13px; color: var(--text-sub); text-align: center; }
.cur-label { margin: 16px 0 8px; font-size: 13px; color: var(--text-sub); }
.cur-label-row { display: flex; align-items: center; justify-content: space-between; }
.cur-del { font-size: 12px; color: var(--danger); padding: 5px 14px; border: 1px solid var(--danger); border-radius: 999px; cursor: pointer; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { display: inline-block; padding: 8px 20px; border-radius: 999px; background: #f5f5f5; color: #595959; font-size: 14px; cursor: pointer; border: 1px solid #f0f0f0; transition: all .15s ease; }
.chip:hover { transform: scale(1.03); }
.chip-on { background: linear-gradient(135deg, #FF7A45 0%, #9254DE 100%); color: #fff; border-color: transparent; box-shadow: var(--shadow); }
.cur-free { margin-top: 18px; display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.cur-active { font-size: 13px; color: var(--primary); font-weight: 700; }

.modes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.mode-card { border-radius: var(--radius); padding: 26px 24px; color: #fff; box-shadow: var(--shadow); cursor: pointer; transition: transform .16s ease, box-shadow .16s ease; position: relative; overflow: hidden; }
.mode-card:hover { transform: translateY(-4px) scale(1.01); box-shadow: var(--shadow-lg); }
.mode-icon { font-size: 44px; }
.mode-title { font-size: 20px; font-weight: 800; margin-top: 8px; }
.mode-desc { font-size: 13px; opacity: .92; margin-top: 4px; }

/* 首次引导 */
.guide-mask { position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px; animation: fadeIn .2s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.guide-card { width: 92%; max-width: 460px; background: #fff; border-radius: 26px; padding: 30px 26px; box-shadow: var(--shadow-lg); text-align: center; animation: pop .25s ease; }
@keyframes pop { from { transform: scale(.9); opacity: .6; } to { transform: scale(1); opacity: 1; } }
.guide-emoji { font-size: 76px; }
.guide-title { font-size: 22px; font-weight: 800; margin: 8px 0 6px; }
.guide-desc { font-size: 14px; color: var(--text-sub); margin-bottom: 18px; }
.guide-modes { text-align: left; margin-bottom: 18px; }
.guide-item { display: flex; align-items: center; padding: 12px 14px; margin-bottom: 8px; background: #FAFAFA; border-radius: 14px; }
.guide-icon { font-size: 30px; margin-right: 14px; }
.guide-name { font-size: 15px; font-weight: 700; }
.guide-tip { font-size: 12px; color: var(--text-sub); margin-top: 2px; }
.guide-btn { width: 100%; padding: 13px; border-radius: 999px; border: none; background: linear-gradient(135deg, #FF7A45, #9254DE); color: #fff; font-weight: 800; font-size: 16px; }

/* ===== 词库 ===== */
.search-bar { display: flex; align-items: center; background: #fff; border-radius: 999px; padding: 12px 22px; box-shadow: var(--shadow); }
.search-icon { font-size: 18px; margin-right: 10px; }
.search-input { flex: 1; font-size: 15px; border: none; outline: none; background: transparent; }
.cats { white-space: nowrap; overflow-x: auto; margin: 18px 0; padding-bottom: 4px; display: flex; gap: 10px; }
.cat { flex: 0 0 auto; padding: 8px 22px; background: #fff; border-radius: 999px; font-size: 14px; color: var(--text-sub); box-shadow: var(--shadow); cursor: pointer; transition: transform .12s ease; }
.cat:hover { transform: scale(1.04); }
.cat-active { background: linear-gradient(135deg, #FF7A45, #FF9C6E); color: #fff; }
.list { display: flex; flex-direction: column; }
.word-card { display: flex; align-items: center; padding: 14px 18px; margin-bottom: 14px; flex-wrap: wrap; transition: transform .14s ease, box-shadow .14s ease; }
.word-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.word-img { width: 60px; height: 60px; border-radius: 14px; margin-right: 16px; object-fit: cover; }
.word-emoji { width: 60px; height: 60px; line-height: 60px; text-align: center; font-size: 32px; background: #FFF3E8; border-radius: 14px; margin-right: 16px; }
.word-main { flex: 1; }
.word-en { font-size: 18px; font-weight: 700; }
.word-zh { font-size: 13px; color: var(--text-sub); margin-top: 3px; }
.word-cat { font-size: 12px; color: var(--primary-blue); background: #EEF3FF; padding: 5px 12px; border-radius: 999px; margin-right: 12px; }
.word-grade { color: var(--primary); font-weight: 700; }
.word-ops { display: flex; gap: 6px; }
.op { font-size: 22px; margin-left: 8px; cursor: pointer; transition: transform .12s ease; }
.op:hover { transform: scale(1.15); }
.op-del { opacity: .85; }

.empty { text-align: center; color: var(--text-sub); padding: 70px 0; }
.empty-emoji { font-size: 64px; margin-bottom: 12px; }

.fab {
  position: fixed; right: 36px; bottom: 40px; width: 60px; height: 60px; line-height: 56px; text-align: center;
  font-size: 38px; color: #fff; background: linear-gradient(135deg, #FF7A45, #FF9C6E);
  border-radius: 50%; box-shadow: 0 10px 28px rgba(255,122,69,.45); cursor: pointer; z-index: 40; transition: transform .14s ease;
}
.fab:hover { transform: scale(1.08) rotate(90deg); }

/* 编辑弹层 */
.mask { position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 100; display: flex; align-items: flex-end; animation: fadeIn .2s ease; }
.sheet { width: 100%; max-width: 560px; margin: 0 auto; background: #fff; border-radius: 26px 26px 0 0; padding: 26px 26px 30px; max-height: 90vh; overflow-y: auto; animation: slideUp .25s ease; }
@keyframes slideUp { from { transform: translateY(40px); opacity: .6; } to { transform: translateY(0); opacity: 1; } }
.sheet-title { font-size: 20px; font-weight: 800; text-align: center; margin-bottom: 18px; }
.field { margin-bottom: 16px; }
.label { font-size: 14px; color: var(--text-sub); display: block; margin-bottom: 7px; }
.input { width: 100%; background: #F7F8FA; border: 1px solid #eee; border-radius: 12px; padding: 12px 16px; font-size: 15px; outline: none; transition: border .15s ease; }
.input:focus { border-color: var(--primary); }
.emoji-row { display: flex; flex-wrap: wrap; gap: 8px; }
.emoji-opt { font-size: 26px; width: 48px; height: 48px; line-height: 48px; text-align: center; background: #F7F8FA; border-radius: 12px; cursor: pointer; transition: transform .12s ease; }
.emoji-opt:hover { transform: scale(1.1); }
.emoji-on { background: #FFE9D6; border: 2px solid var(--primary); }
.img-row { display: flex; align-items: center; }
.img-prev { width: 80px; height: 80px; border-radius: 12px; object-fit: cover; cursor: pointer; }
.img-add { width: 80px; height: 80px; line-height: 80px; text-align: center; background: #F7F8FA; border: 2px dashed #ccc; border-radius: 12px; color: var(--text-sub); font-size: 14px; cursor: pointer; }
.img-del { margin-left: 14px; color: var(--danger); font-size: 22px; cursor: pointer; }
.audio-row { display: flex; align-items: center; gap: 12px; }
.rec-btn, .play-btn { padding: 10px 22px; border-radius: 999px; font-size: 14px; background: #F7F8FA; border: none; cursor: pointer; transition: transform .12s ease; }
.rec-btn:hover, .play-btn:hover { transform: scale(1.04); }
.rec-on { background: var(--danger); color: #fff; }
.sheet-actions { display: flex; gap: 14px; margin-top: 8px; }
.btn-cancel, .btn-save { flex: 1; border-radius: 999px; font-weight: 700; padding: 12px; border: none; font-size: 15px; }
.btn-cancel { background: #F2F3F5; color: var(--text); }
.btn-save { background: linear-gradient(135deg, #FF7A45, #FF9C6E); color: #fff; }

/* ===== 设置 ===== */
.settings { max-width: 760px; margin: 0 auto; }
.section { margin-bottom: 28px; }
.sec-head { font-size: 16px; font-weight: 800; margin-bottom: 12px; }
.desc { font-size: 13px; color: var(--text-sub); line-height: 1.6; margin-bottom: 14px; }
.goal-card { text-align: center; padding: 26px 28px 18px; }
.goal-big { font-size: 46px; font-weight: 800; color: var(--primary); }
.goal-unit { font-size: 14px; color: var(--text-sub); margin-bottom: 16px; }
.goal-slider { width: 100%; accent-color: var(--primary); }
.goal-end { display: flex; justify-content: space-between; font-size: 12px; color: #BFBFBF; margin-top: 2px; }
.card-row { display: flex; gap: 16px; }
.mini-card { flex: 1; background: #fff; border-radius: 16px; padding: 24px 18px; text-align: center; box-shadow: var(--shadow); cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.mini-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.mini-icon { font-size: 40px; }
.mini-title { font-size: 16px; font-weight: 700; margin-top: 8px; }
.mini-desc { font-size: 12px; color: var(--text-sub); margin-top: 4px; }
.paste { width: 100%; min-height: 150px; background: #FAFAFA; border: 2px dashed #e0e0e0; border-radius: 12px; padding: 16px; font-size: 14px; line-height: 1.6; box-sizing: border-box; margin-bottom: 14px; outline: none; font-family: ui-monospace, Menlo, Consolas, monospace; resize: vertical; }
.paste-btns { display: flex; gap: 12px; }
.btn-primary, .btn-outline { flex: 1; font-size: 15px; padding: 11px; border-radius: 12px; border: none; font-weight: 700; cursor: pointer; transition: transform .12s ease; }
.btn-primary { background: linear-gradient(135deg, #FF7A45, #9254DE); color: #fff; }
.btn-outline { background: transparent; border: 2px solid #FF7A45; color: #FF7A45; }
.btn-primary:hover, .btn-outline:hover { transform: scale(1.03); }
.result-card { border-left: 6px solid var(--primary-cyan); }
.rc-title { font-size: 16px; font-weight: 800; color: var(--primary-cyan); margin-bottom: 10px; }
.rc-row { font-size: 14px; color: #595959; margin-bottom: 5px; }
.rc-num { font-weight: 800; color: var(--primary); font-size: 17px; }
.bottom-hint { text-align: center; font-size: 13px; color: #BFBFBF; padding: 24px 0 8px; }

/* ===== 通用游戏：顶栏/进度/结算/按钮 ===== */
.topbar { display: flex; align-items: center; margin-bottom: 22px; }
.progress-text { font-size: 14px; color: var(--text-sub); white-space: nowrap; margin-right: 14px; }
.progress-track { flex: 1; height: 12px; background: #F0F0F0; border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, #FF7A45, #FF9C6E); transition: width .3s ease; }
.sound { font-size: 30px; margin-left: 14px; cursor: pointer; }

.result { text-align: center; padding: 60px 20px; animation: pop .3s ease; }
.result-emoji { font-size: 92px; }
.result-title { font-size: 30px; font-weight: 800; margin-top: 12px; }
.result-stats { display: flex; justify-content: center; gap: 50px; margin: 30px 0; }
.rs-num { font-size: 30px; font-weight: 800; display: block; }
.rs-num.ok { color: var(--success); } .rs-num.no { color: var(--danger); }
.rs-label { font-size: 14px; color: var(--text-sub); }
.result-score { font-size: 26px; font-weight: 800; color: var(--warn); margin-top: 16px; }
.result-sub { font-size: 15px; color: var(--text-sub); margin-top: 10px; }
.r-btn { display: block; width: 60%; max-width: 320px; margin: 14px auto 0; padding: 14px; border-radius: 999px; font-weight: 700; font-size: 16px; border: none; transition: transform .12s ease; }
.r-btn:hover { transform: scale(1.04); }
.r-btn.primary { background: linear-gradient(135deg, #FF7A45, #FF9C6E); color: #fff; }
.r-btn.ghost { background: #F2F3F5; color: var(--text); }
.empty-btn { display: inline-block; margin-top: 18px; padding: 12px 32px; background: linear-gradient(135deg, #FF7A45, #FF9C6E); color: #fff; font-size: 15px; font-weight: 700; border-radius: 999px; border: none; cursor: pointer; }
.empty-btn.ghost { background: #F2F3F5; color: var(--text); }

/* 翻卡 */
.card-wrap { height: 360px; perspective: 1200px; margin: 16px 0 28px; cursor: pointer; }
.card-inner { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform .45s ease; }
.card-inner.is-flipped { transform: rotateY(180deg); }
.card-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: var(--radius); box-shadow: var(--shadow); display: flex; flex-direction: column; align-items: center; justify-content: center; }
.card-front { background: linear-gradient(135deg, #FFF7E8, #FFE9D6); }
.card-back { background: linear-gradient(135deg, #EAF1FF, #D6E4FF); transform: rotateY(180deg); }
.big-emoji { font-size: 96px; }
.big-en { font-size: 46px; font-weight: 800; margin-top: 10px; color: #2B2B2B; }
.big-zh { font-size: 46px; font-weight: 800; color: #2B2B2B; }
.flip-hint { position: absolute; bottom: 20px; font-size: 14px; color: var(--text-sub); }
.actions { display: flex; gap: 16px; }
.act { flex: 1; padding: 16px; border-radius: 999px; font-weight: 800; font-size: 18px; color: #fff; border: none; transition: transform .12s ease; }
.act:hover { transform: scale(1.03); }
.act.ok { background: linear-gradient(135deg, #52C41A, #73D13D); }
.act.no { background: linear-gradient(135deg, #FF7A45, #FF9C6E); }
.hint { text-align: center; font-size: 13px; color: var(--text-sub); margin-top: 18px; }

/* 碰撞 */
.gr .topbar { justify-content: space-between; }
.time { font-size: 24px; font-weight: 800; color: var(--primary); }
.score { font-size: 22px; font-weight: 800; color: var(--warn); }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.tile { min-height: 92px; border-radius: 16px; display: flex; align-items: center; justify-content: center; text-align: center; padding: 10px; font-size: 18px; font-weight: 700; box-shadow: var(--shadow); background: #fff; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; user-select: none; }
.tile:hover { transform: scale(1.04); }
.tile.en { background: linear-gradient(135deg, #EAF1FF, #D6E4FF); color: #2B2B2B; }
.tile.zh { background: linear-gradient(135deg, #FFF3E8, #FFE0C2); color: #2B2B2B; }
.tile.sel { transform: scale(1.06); box-shadow: 0 0 0 4px var(--primary); }
.tile.matched { opacity: 0; transform: scale(.6); pointer-events: none; }

/* 闯关 */
.lives { font-size: 26px; }
.heart.lost { opacity: .25; filter: grayscale(1); }
.qcard { padding: 38px 28px; text-align: center; margin-bottom: 26px; }
.q-emoji { font-size: 84px; }
.q-zh { font-size: 28px; font-weight: 700; margin-top: 12px; }
.q-sound { display: inline-block; margin-top: 14px; font-size: 15px; color: var(--primary-blue); cursor: pointer; }
.options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.opt { padding: 18px; background: #fff; border-radius: 16px; font-size: 20px; font-weight: 700; box-shadow: var(--shadow); color: var(--text); border: none; cursor: pointer; transition: transform .12s ease; }
.opt:hover:not(:disabled) { transform: scale(1.03); }
.opt:disabled { cursor: default; }
.opt.right { background: linear-gradient(135deg, #52C41A, #73D13D); color: #fff; }
.opt.wrong { background: linear-gradient(135deg, #FF4D4F, #FF7875); color: #fff; }
.combo { text-align: center; color: var(--danger); font-weight: 800; font-size: 22px; margin-top: 8px; animation: pop .25s ease; }

/* 拼写 */
.prompt { text-align: center; padding: 34px 28px; margin-bottom: 22px; }
.p-emoji { font-size: 84px; }
.p-zh { font-size: 28px; font-weight: 700; margin-top: 8px; }
.p-en-tip { font-size: 16px; color: var(--text-sub); margin-top: 4px; }
.p-sound { display: inline-block; margin-top: 12px; font-size: 15px; color: var(--primary-purple); cursor: pointer; }
.answer { min-height: 64px; line-height: 64px; text-align: center; background: #fff; border-radius: 16px; box-shadow: var(--shadow); font-size: 30px; font-weight: 800; letter-spacing: 6px; margin-bottom: 22px; }
.answer.empty { color: var(--text-sub); font-size: 16px; font-weight: 400; letter-spacing: 0; }
.answer.shake { animation: shake .4s; border: 2px solid var(--danger); color: var(--danger); }
@keyframes shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-10px); } 75% { transform: translateX(10px); } }
.letters { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 26px; }
.letter { width: 64px; height: 64px; line-height: 64px; text-align: center; margin: 0; border-radius: 16px; font-size: 30px; font-weight: 800; background: linear-gradient(135deg, #9254DE, #B37FEB); color: #fff; box-shadow: var(--shadow); cursor: pointer; transition: transform .12s ease; }
.letter:hover { transform: scale(1.08); }
.letter.used { opacity: .25; transform: scale(.9); pointer-events: none; }
.sp .actions { gap: 16px; }
.b { flex: 1; padding: 16px; border-radius: 999px; font-weight: 800; font-size: 18px; color: #fff; border: none; transition: transform .12s ease; }
.b:hover { transform: scale(1.03); }
.b.ok { background: linear-gradient(135deg, #52C41A, #73D13D); }
.b.del { background: linear-gradient(135deg, #FF7A45, #FF9C6E); }
.b.hint { background: linear-gradient(135deg, #FAAD14, #FFC53D); }
.wrong-tip { text-align: center; color: var(--danger); font-size: 16px; margin-top: 16px; }

/* ===== UI：toast / modal / loading ===== */
.ww-toast { position: fixed; left: 50%; top: 18%; transform: translate(-50%, -10px); z-index: 500; background: rgba(43,43,43,.92); color: #fff; padding: 12px 22px; border-radius: 14px; font-size: 14px; display: flex; align-items: center; gap: 8px; box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease; }
.ww-toast.show { opacity: 1; transform: translate(-50%, 0); }
.ww-toast-ic { font-size: 16px; }

.ww-modal-mask { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 400; display: none; align-items: center; justify-content: center; padding: 20px; }
.ww-modal-mask.show { display: flex; animation: fadeIn .18s ease; }
.ww-modal { width: 92%; max-width: 380px; background: #fff; border-radius: 20px; padding: 26px 24px; box-shadow: var(--shadow-lg); animation: pop .22s ease; }
.ww-modal-title { font-size: 19px; font-weight: 800; text-align: center; }
.ww-modal-content { font-size: 15px; color: #595959; line-height: 1.6; margin: 16px 0 22px; white-space: pre-wrap; text-align: center; }
.ww-modal-actions { display: flex; gap: 12px; }
.ww-btn { flex: 1; padding: 12px; border-radius: 12px; font-weight: 700; font-size: 15px; border: none; cursor: pointer; }
.ww-btn-primary { background: linear-gradient(135deg, #FF7A45, #9254DE); color: #fff; }
.ww-btn-ghost { background: #F2F3F5; color: var(--text); }

.ww-loading-mask { position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 450; display: none; align-items: center; justify-content: center; }
.ww-loading-mask.show { display: flex; }
.ww-loading { background: #fff; border-radius: 16px; padding: 26px 34px; display: flex; flex-direction: column; align-items: center; gap: 14px; box-shadow: var(--shadow-lg); }
.ww-spin { width: 34px; height: 34px; border: 4px solid #FFE0C2; border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.ww-loading-txt { font-size: 14px; color: var(--text-sub); }

/* ===== 响应式（移动端） ===== */
@media (max-width: 860px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; flex: none; height: auto; position: static; flex-direction: column; padding: 12px; box-shadow: none; }
  .brand { display: none; }
  .nav { flex-direction: row; overflow-x: auto; gap: 8px; padding-bottom: 4px; }
  .nav-item { flex: 0 0 auto; padding: 10px 14px; font-size: 14px; }
  .nav-item:hover { transform: none; }
  .nav-sep { display: none; }
  .sidebar-foot { display: none; }
  .menu-btn { display: none; }
  .view { padding: 18px 16px 60px; }
  .modes { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(3, 1fr); }
  .options { grid-template-columns: 1fr; }
  .card-row { flex-direction: column; }
  .result-stats { gap: 30px; }
}
@media (max-width: 480px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 30px; }
}

/* ===== 页面进场转场 ===== */
.view-in { animation: viewIn .28s cubic-bezier(.22,.61,.36,1) both; }
@keyframes viewIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

/* ===== 词库掌握度进度条 ===== */
.wp-track { flex-basis: 100%; height: 6px; border-radius: 999px; background: #f0f0f0; margin-top: 10px; overflow: hidden; }
.wp-fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, #FF7A45, #FF9C6E); transition: width .4s ease; }
.wp-fill.wp-mastered { background: linear-gradient(90deg, #52C41A, #73D13D); }
.wp-fill.wp-none { background: transparent; }

/* ===== 设置：外观分区 / 主题分段控件 ===== */
.appearance-card { padding: 16px 20px; }
.ap-row { display: flex; align-items: center; justify-content: space-between; }
.ap-label { font-size: 15px; font-weight: 600; }
.ts { display: inline-flex; background: #F2F3F5; border-radius: 999px; padding: 4px; gap: 4px; }
.ts-opt { padding: 8px 18px; border-radius: 999px; font-size: 14px; font-weight: 600; color: var(--text-sub); cursor: pointer; transition: all .15s ease; user-select: none; }
.ts-opt:hover { color: var(--primary); }
.ts-opt.ts-on { background: #fff; color: var(--primary); box-shadow: var(--shadow); }

/* ===== 弹层质感打磨 ===== */
.ww-modal-mask { backdrop-filter: blur(3px); }
.mask { backdrop-filter: blur(3px); }
.ww-modal { border: 1px solid rgba(0,0,0,.04); }
.sheet { border: 1px solid rgba(0,0,0,.04); }

/* ===== 暗色主题 ===== */
[data-theme="dark"] {
  --bg: #15161E;
  --bg2: #1C1D26;
  --card: #23242F;
  --text: #ECECEC;
  --text-sub: #9A9DA8;
  --shadow: 0 8px 24px rgba(0,0,0,.45);
  --shadow-lg: 0 16px 40px rgba(0,0,0,.55);
}
[data-theme="dark"] body { background: linear-gradient(180deg, #15161E 0%, #1C1D26 55%); color: var(--text); }
[data-theme="dark"] .sidebar { background: linear-gradient(180deg, #C2541F 0%, #A8431A 60%, #8A3414 100%); box-shadow: 4px 0 24px rgba(0,0,0,.5); }
[data-theme="dark"] .topbar { background: rgba(28,29,38,.82); border-bottom-color: rgba(255,255,255,.06); }
[data-theme="dark"] .search-bar,
[data-theme="dark"] .cat { background: var(--card); color: var(--text-sub); }
[data-theme="dark"] .cat-active { color: #fff; }
[data-theme="dark"] .chip { background: #2A2B36; color: #C8C9D2; border-color: #33343F; }
[data-theme="dark"] .input { background: #2A2B36; border-color: #33343F; color: var(--text); }
[data-theme="dark"] .input:focus { border-color: var(--primary); }
[data-theme="dark"] .emoji-opt,
[data-theme="dark"] .rec-btn,
[data-theme="dark"] .play-btn { background: #2A2B36; color: var(--text); }
[data-theme="dark"] .emoji-on { background: #3A2A22; border-color: var(--primary); }
[data-theme="dark"] .btn-cancel,
[data-theme="dark"] .r-btn.ghost,
[data-theme="dark"] .empty-btn.ghost,
[data-theme="dark"] .ww-btn-ghost { background: #2A2B36; color: var(--text); }
[data-theme="dark"] .paste { background: #2A2B36; border-color: #33343F; color: var(--text); }
[data-theme="dark"] .guide-item { background: #2A2B36; }
[data-theme="dark"] .goal-track,
[data-theme="dark"] .progress-track { background: #33343F; }
[data-theme="dark"] .divider { background: #33343F; }
[data-theme="dark"] .word-emoji { background: #3A2E22; }
[data-theme="dark"] .word-cat { background: #2A3142; color: #9DB4FF; }
[data-theme="dark"] .cur-import { background: #2A2B36; border-color: var(--primary); }
[data-theme="dark"] .wp-track { background: #33343F; }
[data-theme="dark"] .ts { background: #2A2B36; }
[data-theme="dark"] .ts-opt.ts-on { background: #3A3B47; color: #fff; }
[data-theme="dark"] .ww-modal,
[data-theme="dark"] .ww-modal-content { background: #23242F; color: var(--text); }
[data-theme="dark"] .ww-modal-content { color: #B8B9C2; }
[data-theme="dark"] .sheet { background: #23242F; }
[data-theme="dark"] .label { color: var(--text-sub); }
[data-theme="dark"] .desc { color: var(--text-sub); }
[data-theme="dark"] .mini-card { background: var(--card); }
[data-theme="dark"] .result-card { background: var(--card); }
[data-theme="dark"] .setting-note,
[data-theme="dark"] .bottom-hint { color: #6E707A; }