:root {
  --primary: #4f7cff;
  --primary-dark: #3a63d8;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2430;
  --text-soft: #6b7280;
  --ok: #2bb673;
  --warn: #f5a623;
  --bad: #ef5350;
  --shadow: 0 6px 20px rgba(31, 36, 48, .08);
  --radius: 16px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  position: relative;
  padding-bottom: 64px;
}

/* 顶部栏 */
.appbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: linear-gradient(120deg, var(--primary), #6a8bff);
  color: #fff;
}
.appbar-title { font-size: 19px; font-weight: 700; letter-spacing: .5px; }
.appbar-sub { font-weight: 400; opacity: .8; font-size: 14px; }
.icon-btn {
  background: rgba(255,255,255,.18);
  border: none;
  color: #fff;
  width: 38px; height: 38px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
}

/* 页面 */
#pages { flex: 1; padding: 16px; }
.page { display: none; animation: fade .25s ease; }
.page.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px);} to { opacity:1; transform:none; } }

.section-title { font-size: 16px; margin: 18px 4px 10px; color: var(--text); }

/* 首页 hero */
.hero {
  background: linear-gradient(135deg, #5b8def, #7c5cff);
  border-radius: 22px;
  padding: 22px 20px;
  color: #fff;
  box-shadow: var(--shadow);
}
.hero-greet { font-size: 14px; opacity: .85; }
.hero-title { font-size: 22px; margin: 6px 0 18px; font-weight: 700; }
.streak-row { display: flex; gap: 10px; }
.streak-card {
  flex: 1;
  background: rgba(255,255,255,.16);
  border-radius: 14px;
  padding: 12px 6px;
  text-align: center;
}
.streak-num { font-size: 22px; font-weight: 700; }
.streak-label { font-size: 12px; opacity: .85; margin-top: 2px; }

/* 快速开始 */
.quick-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.quick-card {
  background: var(--card);
  border: none;
  border-radius: var(--radius);
  padding: 16px;
  text-align: left;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .12s ease;
}
.quick-card:active { transform: scale(.97); }
.quick-emoji { font-size: 26px; }
.quick-name { font-weight: 700; margin-top: 8px; font-size: 15px; }
.quick-desc { font-size: 12px; color: var(--text-soft); margin-top: 2px; }

.tip-box {
  margin-top: 18px;
  background: #fff7e6;
  border: 1px solid #ffe2a8;
  border-radius: 14px;
  padding: 14px;
  font-size: 13px;
  color: #8a6d2f;
  line-height: 1.6;
}
.tip-box strong { color: #b5811b; }

/* 卡片通用 */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}

/* 跟读 */
.level-filter { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.chip {
  border: 1px solid #dfe3ec;
  background: #fff;
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-soft);
}
.chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.shadow-level {
  display: inline-block;
  background: #eef2ff;
  color: var(--primary);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 10px;
  margin-bottom: 10px;
}
.shadow-en { font-size: 22px; font-weight: 700; line-height: 1.4; }
.shadow-zh { color: var(--text-soft); margin-top: 6px; font-size: 15px; }
.shadow-actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0; }

.btn {
  border: none;
  border-radius: 12px;
  padding: 11px 14px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 600;
}
.btn-ghost { background: #f0f3fa; color: var(--text); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-danger { background: #fff0f0; color: var(--bad); width: 100%; margin-top: 18px; }
.btn:active { transform: scale(.97); }

.record-wrap { text-align: center; margin-top: 6px; }
.record-btn {
  width: 120px; height: 120px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), #6a8bff);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(79,124,255,.4);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  transition: transform .12s ease;
}
.record-btn:active, .record-btn.recording { transform: scale(.94); background: linear-gradient(135deg, var(--bad), #ff7676); }
.record-ico { font-size: 34px; }
.record-status { margin-top: 10px; font-size: 13px; color: var(--text-soft); min-height: 18px; }

.result { margin-top: 14px; }
.result .score-badge {
  display: inline-block;
  font-size: 28px; font-weight: 800;
  padding: 4px 14px; border-radius: 12px;
  margin-bottom: 8px;
}
.result .you-said { font-size: 14px; color: var(--text-soft); }
.result .you-said b { color: var(--text); }
.result .miss { color: var(--bad); }
.result .hit { color: var(--ok); }
.feedback { font-size: 13px; margin-top: 8px; line-height: 1.6; background: #f7f9ff; border-radius: 10px; padding: 10px; }

/* 场景对话 */
.scenario-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.scenario-item {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.scenario-item:active { transform: scale(.97); }
.scenario-item .emoji { font-size: 28px; }
.scenario-item .name { font-weight: 700; margin-top: 8px; }
.scenario-item .desc { font-size: 12px; color: var(--text-soft); margin-top: 4px; line-height: 1.5; }

.scenario-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.scenario-title { font-weight: 700; font-size: 16px; }
.dialog { display: flex; flex-direction: column; gap: 12px; }
.bubble { max-width: 85%; padding: 12px 14px; border-radius: 14px; line-height: 1.5; }
.bubble .who { font-size: 11px; opacity: .7; margin-bottom: 3px; }
.bubble.them { background: #eef2ff; align-self: flex-start; border-bottom-left-radius: 4px; }
.bubble.me { background: var(--primary); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.bubble .en { font-weight: 600; }
.bubble .zh { font-size: 12px; opacity: .8; margin-top: 3px; }
.scenario-foot { margin-top: 16px; text-align: right; }

/* 词库 */
.cat-tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 12px; }
.cat-tabs .chip { white-space: nowrap; }
.word-list { display: flex; flex-direction: column; gap: 10px; }
.word-item {
  background: var(--card);
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.word-main { flex: 1; }
.word-en { font-size: 17px; font-weight: 700; }
.word-ph { color: var(--text-soft); font-size: 13px; margin-left: 8px; }
.word-zh { color: var(--text-soft); font-size: 13px; margin-top: 3px; }
.word-actions { display: flex; gap: 8px; }
.mini-btn {
  border: none; background: #f0f3fa; border-radius: 10px;
  width: 40px; height: 40px; font-size: 18px; cursor: pointer;
}
.mini-btn.known { background: #e6f9ef; }

/* 进步 */
.big-stat { font-size: 16px; padding: 8px 0; border-bottom: 1px solid #f0f2f7; }
.big-stat span { font-weight: 800; color: var(--primary); font-size: 20px; }
.history { display: flex; flex-direction: column; gap: 8px; }
.history-item { background: var(--card); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow); font-size: 13px; }
.history-item .h-en { font-weight: 600; }
.history-item .h-meta { color: var(--text-soft); margin-top: 4px; display: flex; justify-content: space-between; }

/* 底部导航 */
.tabbar {
  position: fixed;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 100%; max-width: 480px;
  background: #fff;
  display: flex;
  border-top: 1px solid #eceef3;
  padding: 6px 0;
  z-index: 20;
}
.tab {
  flex: 1;
  background: none; border: none;
  display: flex; flex-direction: column; align-items: center;
  font-size: 11px; color: var(--text-soft);
  cursor: pointer; padding: 4px 0;
}
.tab span { font-size: 20px; }
.tab.active { color: var(--primary); font-weight: 700; }

/* 词库搜索与字母索引 */
.vocab-search { margin-bottom: 12px; }
.search-input {
  width: 100%; padding: 12px 14px;
  border: 1px solid #dfe3ec; border-radius: 12px;
  font-size: 14px; background: #fff; color: var(--text);
}
.alpha-bar { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 10px; max-height: 76px; overflow-y: auto; }
.alpha {
  border: 1px solid #dfe3ec; background: #fff; border-radius: 8px;
  width: 28px; height: 28px; font-size: 12px; cursor: pointer; color: var(--text-soft);
}
.alpha.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.vocab-count { font-size: 12px; color: var(--text-soft); margin-bottom: 8px; }

/* 语音设置弹层 */
.modal-mask {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.42);
  display: flex; align-items: flex-end; justify-content: center;
  z-index: 50;
}
.modal {
  background: #fff;
  width: 100%; max-width: 480px;
  border-radius: 20px 20px 0 0;
  padding: 18px 18px 26px;
  animation: slideUp .25s ease;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: none; } }
.modal-head { display: flex; justify-content: space-between; align-items: center; }
.modal-title { font-weight: 700; font-size: 17px; }
.modal-close { background: #f0f3fa; color: var(--text); width: 34px; height: 34px; }
.field-label { font-size: 13px; color: var(--text-soft); display: block; margin-bottom: 8px; }
.select {
  width: 100%; padding: 12px;
  border: 1px solid #dfe3ec; border-radius: 12px;
  font-size: 14px; background: #fff; color: var(--text);
}
.range { width: 100%; accent-color: var(--primary); margin-top: 4px; }
.modal-tip { font-size: 12px; color: var(--text-soft); line-height: 1.6; margin-top: 14px; }
.seg { display: flex; gap: 6px; background: var(--bg-soft); border-radius: 12px; padding: 4px; }
.seg-btn { flex: 1; border: none; background: transparent; color: var(--text-soft); font-size: 13px; padding: 9px 0; border-radius: 9px; cursor: pointer; transition: .15s; }
.seg-btn.active { background: var(--primary); color: #fff; font-weight: 700; box-shadow: 0 2px 8px rgba(79,124,255,.35); }
.cloud-detail { font-size: 13px; color: var(--text-soft); margin: 8px 0 2px; }
.cloud-detail::before { content: '🌐 '; }