/* ============================================================
   小学英语点读 · 共享主题
   暖奶油底 + 一套贯穿四个 tab 的统一配色（色相可在页面里切换）
   主题：html[data-theme="<id>"] 由 ui.js 的 UI.THEMES 驱动
   使用：index.html / quiz.html / dictation.html / fav.html
   ============================================================ */

/* ===== 1. 设计令牌 ===== */
:root {
  /* 背景与卡片（四页共用，保持暖色系统一） */
  --bg-page: #FFF9F0;
  --bg-card: #FFFFFF;
  --bg-field: #FFFDF8;
  --bg-soft: #FFF6E9;

  /* 文字 */
  --text-primary: #3A3D5C;
  --text-secondary: #8A91A8;
  --text-muted: #A9AFC2;

  /* 语义色 */
  --accent-blue: #4A9FEA;
  --accent-coral: #FF6B8A;
  --accent-orange: #FF9A62;
  --accent-green: #3CCF5B;
  --accent-gold: #FFB020;
  --danger: #E4573D;

  /* 英文单词专用色（四页统一，是唯一一处冷色，用来把英文挑出来） */
  --word-ink: #3D63DD;

  /* 描边与阴影 */
  --border-soft: #F2E3CB;
  --border-field: #F5D6A6;
  --shadow-color: rgba(93, 76, 130, 0.16);
  --shadow-card: 0 4px 16px var(--shadow-color);

  /* 渐变 */
  --grad-warm: linear-gradient(135deg, #FF9A62, #FF6B8A);
  --grad-gold: linear-gradient(135deg, #FFC56E, #FFB020);
  --grad-blue: linear-gradient(135deg, #6FB8F5, #4A9FEA);
  --grad-green: linear-gradient(135deg, #5FDD7B, #3CCF5B);

  /* 尺寸（宽屏分档见文件末尾的响应式段） */
  --app-max: 760px;
  --radius-card: 24px;
  --radius-pill: 30px;

  /* ---- 品牌色（下文由 html[data-theme] 覆盖，默认取蜜桃橙） ---- */
  --pg-grad: linear-gradient(135deg, #FFA46B, #FF6B4A);
  --pg-accent: #FF6B4A;
  --pg-ink: #C0401C;
  --pg-soft: #FFF1E8;
  --pg-soft2: #FFE4D6;
  --pg-shadow: rgba(255, 107, 74, 0.34);
  --pg-shadow-soft: rgba(255, 107, 74, 0.18);
}

/* ---- 2. 统一配色：四页共用一个色相，靠 data-theme 切换 ----
   加新配色只需两处：这里加一段，再往 ui.js 的 UI.THEMES 里加一条，
   构建脚本会断言两边对得上（跟音色白名单一个套路）。
   注意：只有品牌色（--pg-*）跟着换，语义色（对绿 / 错红 / 信息蓝）不换。 */
html[data-theme="peach"] {
  --pg-grad: linear-gradient(135deg, #FFA46B, #FF6B4A);
  --pg-accent: #FF6B4A;
  --pg-ink: #C0401C;
  --pg-soft: #FFF1E8;
  --pg-soft2: #FFE4D6;
  --pg-shadow: rgba(255, 107, 74, 0.34);
  --pg-shadow-soft: rgba(255, 107, 74, 0.18);
}
html[data-theme="amber"] {
  --pg-grad: linear-gradient(135deg, #FFCB61, #F2A63B);
  --pg-accent: #F2A63B;
  --pg-ink: #A96A00;
  --pg-soft: #FFF6E2;
  --pg-soft2: #FFE9C2;
  --pg-shadow: rgba(242, 166, 59, 0.34);
  --pg-shadow-soft: rgba(242, 166, 59, 0.18);
}
html[data-theme="coral"] {
  --pg-grad: linear-gradient(135deg, #FF9AB4, #FF5C7C);
  --pg-accent: #FF5C7C;
  --pg-ink: #C22A4E;
  --pg-soft: #FFF0F4;
  --pg-soft2: #FFDFE7;
  --pg-shadow: rgba(255, 92, 124, 0.34);
  --pg-shadow-soft: rgba(255, 92, 124, 0.18);
}
html[data-theme="berry"] {
  --pg-grad: linear-gradient(135deg, #F08CBE, #D14B8F);
  --pg-accent: #D14B8F;
  --pg-ink: #9C2C67;
  --pg-soft: #FFF0F7;
  --pg-soft2: #FBDCEB;
  --pg-shadow: rgba(209, 75, 143, 0.34);
  --pg-shadow-soft: rgba(209, 75, 143, 0.18);
}
html[data-theme="matcha"] {
  --pg-grad: linear-gradient(135deg, #7ED9A9, #3FA97A);
  --pg-accent: #3FA97A;
  --pg-ink: #1F7A55;
  --pg-soft: #EFFAF3;
  --pg-soft2: #D8F1E2;
  --pg-shadow: rgba(63, 169, 122, 0.34);
  --pg-shadow-soft: rgba(63, 169, 122, 0.18);
}
html[data-theme="sky"] {
  --pg-grad: linear-gradient(135deg, #7FB8F0, #4A8FE7);
  --pg-accent: #4A8FE7;
  --pg-ink: #215E9E;
  --pg-soft: #EFF5FD;
  --pg-soft2: #D8E7F8;
  --pg-shadow: rgba(74, 143, 231, 0.34);
  --pg-shadow-soft: rgba(74, 143, 231, 0.18);
}

/* ---- 冷色系 6 套（五年级以上的清爽色相，同样只换品牌色） ---- */
html[data-theme="mint"] {
  --pg-grad: linear-gradient(135deg, #6FE0C9, #2FC4A6);
  --pg-accent: #2FC4A6;
  --pg-ink: #11785F;
  --pg-soft: #E6FBF6;
  --pg-soft2: #CFF3EC;
  --pg-shadow: rgba(47, 196, 166, 0.34);
  --pg-shadow-soft: rgba(47, 196, 166, 0.18);
}
html[data-theme="cyan"] {
  --pg-grad: linear-gradient(135deg, #5CC4EA, #17A2D6);
  --pg-accent: #17A2D6;
  --pg-ink: #0B6F99;
  --pg-soft: #E6F6FD;
  --pg-soft2: #CFEAF8;
  --pg-shadow: rgba(23, 162, 214, 0.34);
  --pg-shadow-soft: rgba(23, 162, 214, 0.18);
}
html[data-theme="pine"] {
  --pg-grad: linear-gradient(135deg, #4FB488, #1E8C63);
  --pg-accent: #1E8C63;
  --pg-ink: #0F5A3C;
  --pg-soft: #E7F6EF;
  --pg-soft2: #CFEADD;
  --pg-shadow: rgba(30, 140, 99, 0.34);
  --pg-shadow-soft: rgba(30, 140, 99, 0.18);
}
html[data-theme="slate"] {
  --pg-grad: linear-gradient(135deg, #8AA6C8, #5C7EA8);
  --pg-accent: #5C7EA8;
  --pg-ink: #3A5577;
  --pg-soft: #EEF2F8;
  --pg-soft2: #DCE6F1;
  --pg-shadow: rgba(92, 126, 168, 0.34);
  --pg-shadow-soft: rgba(92, 126, 168, 0.18);
}
html[data-theme="indigo"] {
  --pg-grad: linear-gradient(135deg, #8C92EE, #5A63DE);
  --pg-accent: #5A63DE;
  --pg-ink: #353DC0;
  --pg-soft: #EDEEFB;
  --pg-soft2: #DADDF6;
  --pg-shadow: rgba(90, 99, 222, 0.34);
  --pg-shadow-soft: rgba(90, 99, 222, 0.18);
}
html[data-theme="violet"] {
  --pg-grad: linear-gradient(135deg, #B488F0, #8A5CE0);
  --pg-accent: #8A5CE0;
  --pg-ink: #5E37B0;
  --pg-soft: #F4EEFC;
  --pg-soft2: #E7DCF8;
  --pg-shadow: rgba(138, 92, 224, 0.34);
  --pg-shadow-soft: rgba(138, 92, 224, 0.18);
}

/* 页面身份类：只用来区分「这是哪一页」，不再各自带色相。
   点读页借它单独放宽容器宽度（密集网格需要更多列）。 */
body.page-point,
body.page-quiz,
body.page-dictation,
body.page-fav { background: var(--bg-page); }

/* ===== 3. 重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
button, input, select, textarea { font-family: inherit; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--pg-soft); }
::-webkit-scrollbar-thumb { background: var(--pg-soft2); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--pg-accent); }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Segoe UI', 'PingFang SC', Roboto, system-ui, -apple-system, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  padding: 0 14px calc(28px + env(safe-area-inset-bottom));
  overflow-x: hidden;
}
.app {
  max-width: var(--app-max);
  margin: 0 auto;
  padding-top: calc(12px + env(safe-area-inset-top));
}

/* 仅屏幕阅读器可见（页面主标题） */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 4. 顶部导航（tab 即主菜单） ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: 7px;
  border-radius: var(--radius-pill);
  box-shadow: 0 6px 20px rgba(93, 76, 130, 0.14);
  border: 1px solid var(--pg-soft2);
  margin-bottom: 14px;
}
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
  padding: 0 10px 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
}
.nav-brand .brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--pg-grad);
  box-shadow: 0 4px 10px var(--pg-shadow);
  font-size: 16px;
  line-height: 1;
}
.nav-tabs { display: flex; flex: 1 1 auto; gap: 6px; min-width: 0; }
.nav-item {
  flex: 1 1 0;
  min-width: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  padding: 9px 8px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: 0.18s;
  border: 1px solid transparent;
}
.nav-item:hover { background: var(--pg-soft); color: var(--text-primary); }
.nav-item.active {
  background: var(--pg-grad);
  color: #FFFFFF;
  box-shadow: 0 6px 16px var(--pg-shadow);
}
.nav-item.active:hover { background: var(--pg-grad); color: #FFFFFF; }

/* 配色切换（右上角 🎨） */
.theme-wrap { position: relative; flex-shrink: 0; display: inline-flex; }
.theme-btn {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  line-height: 1;
  border: 1px solid var(--pg-soft2);
  border-radius: 50%;
  background: var(--pg-soft);
  color: var(--pg-ink);
  cursor: pointer;
  transition: 0.18s;
}
.theme-btn:hover { border-color: var(--pg-accent); transform: translateY(-1px); }
.theme-btn[aria-expanded="true"] { background: var(--pg-grad); border-color: transparent; box-shadow: 0 5px 14px var(--pg-shadow); }
.theme-pop {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  z-index: 300;
  width: 208px;
  padding: 10px;
  background: #FFFFFF;
  border: 1px solid var(--border-field);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(93, 76, 130, 0.22), 0 4px 12px rgba(93, 76, 130, 0.1);
  animation: ddIn 0.16s ease;
}
.theme-pop[hidden] { display: none; }
.theme-pop-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 2px 6px 8px;
}
/* 冷/暖分组标签：弹层里把 6+6 套配色分成两栏 */
.theme-group-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  padding: 9px 6px 5px;
  margin-top: 2px;
  border-top: 1px dashed var(--border-field);
}
.theme-group-label:first-of-type { border-top: none; margin-top: 0; }
.theme-group-label.warm { color: #D2693E; }
.theme-group-label.cool { color: #2E8BB0; }
.theme-list { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.theme-opt {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: 0.15s;
}
.theme-opt:hover { background: var(--bg-soft); }
.theme-opt[aria-checked="true"] { border-color: var(--pg-accent); background: var(--pg-soft); color: var(--pg-ink); }
.theme-opt .dot {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}
@media (max-width: 430px) {
  .theme-pop { position: fixed; right: 10px; left: 10px; top: 62px; width: auto; }
  .theme-list { grid-template-columns: 1fr 1fr 1fr; }
}

/* ===== 5. 卡片 ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-soft);
  padding: 18px 20px;
  margin-bottom: 16px;
}
.card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--pg-accent);
  line-height: 1.4;
}
.card-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-soft), transparent);
}
.card-title.gold { border-left-color: var(--accent-gold); }
.card-title.blue { border-left-color: var(--accent-blue); }
.card-title.green { border-left-color: var(--accent-green); }

/* 说明条 */
.hint {
  display: flex;
  gap: 8px;
  background: var(--pg-soft);
  border: 1px solid var(--pg-soft2);
  border-left: 4px solid var(--pg-accent);
  border-radius: 14px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--pg-ink);
}
.hint b, .hint strong { color: var(--pg-ink); filter: saturate(1.4) brightness(0.9); }

/* ===== 6. 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  min-height: 42px;
  border: 1px solid var(--border-field);
  border-radius: var(--radius-pill);
  background: #FFFFFF;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.18s;
  white-space: nowrap;
}
.btn:hover { border-color: var(--pg-accent); transform: translateY(-1px); }
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 2px; }
.btn.primary { background: var(--pg-grad); border-color: transparent; color: #FFFFFF; box-shadow: 0 6px 16px var(--pg-shadow); }
.btn.blue { background: var(--grad-blue); border-color: transparent; color: #FFFFFF; box-shadow: 0 6px 16px rgba(74, 159, 234, 0.3); }
.btn.green { background: var(--grad-green); border-color: transparent; color: #FFFFFF; box-shadow: 0 6px 16px rgba(60, 207, 91, 0.3); }
.btn.gold { background: var(--grad-gold); border-color: transparent; color: #FFFFFF; box-shadow: 0 6px 16px rgba(255, 176, 32, 0.32); }
.btn.danger { background: #FFFFFF; border-color: #FFD3CB; color: var(--danger); }
.btn.danger:hover { background: #FFF1EE; border-color: #FFB3A5; }
.btn.sm { padding: 6px 14px; min-height: 34px; font-size: 13.5px; }
.btn.block { width: 100%; }

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn-row .btn { flex: 1 1 0; min-width: 96px; }

/* ===== 7. 表单控件 ===== */
.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
input[type="text"], input[type="search"], textarea {
  width: 100%;
  border: 1px solid var(--border-field);
  border-radius: var(--radius-pill);
  background: #FFFFFF;
  padding: 10px 16px;
  font-size: 15px;
  color: var(--text-primary);
  outline: none;
  transition: 0.2s;
}
textarea { border-radius: 18px; resize: vertical; line-height: 1.6; padding: 12px 16px; }
input[type="text"]:focus, input[type="search"]:focus, textarea:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(74, 159, 234, 0.2);
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }

/* 复选框 */
.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}
.check input[type="checkbox"] {
  width: 19px;
  height: 19px;
  accent-color: var(--pg-accent);
  cursor: pointer;
}

/* 滑块 */
.range-row { display: flex; align-items: center; gap: 10px; }
.range-row input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--pg-accent) 0%, var(--pg-accent) var(--fill, 50%), var(--pg-soft2) var(--fill, 50%), var(--pg-soft2) 100%);
  outline: none;
  cursor: pointer;
}
.range-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 3px solid var(--pg-accent);
  box-shadow: 0 2px 6px var(--pg-shadow);
  cursor: pointer;
}
.range-row input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 3px solid var(--pg-accent);
  cursor: pointer;
}
.range-row .range-val {
  min-width: 38px;
  text-align: right;
  font-weight: 700;
  font-size: 14px;
  color: var(--pg-accent);
}

/* ===== 8. 自定义下拉（替代原生 select 的直角选项列表） =====
   原生 select 的闭合框体可以加圆角，但点开后的选项列表由系统绘制，CSS 够不着。
   这里保留原生 select 当数据源（隐藏），另渲染触发器 + 弹层。 */
select.dd-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  border: 0 !important;
  opacity: 0 !important;
  pointer-events: none !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
}

/* 量文案自然宽度用的探针（ui.js 动态创建），永远不参与布局 */
.dd-measure {
  position: absolute;
  left: -9999px;
  top: 0;
  visibility: hidden;
  white-space: nowrap;
  pointer-events: none;
}

.dd { position: relative; display: inline-flex; min-width: 0; }
.dd.wide { display: flex; width: 100%; }

/* 自适应宽度的选框行 ------------------------------------------------
   --dd-w 由 ui.js 按当前文案量出，既当 flex 基准也当下限：
   · 基准 = 内容宽度 → 文案永远不会被省略号吃掉
   · flex-grow: 1   → 行尾剩下的空白按比例补掉，一行放得下就一行
   · 放不下时靠 flex-wrap 自然折行，而不是把字挤掉 */
[data-dd-autofit] > .dd {
  flex: 1 1 var(--dd-w, 140px);
  min-width: var(--dd-w, 0px);
}
.dd-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 42px;
  padding: 8px 15px;
  border: 1px solid var(--border-field);
  border-radius: var(--radius-pill);
  background: #FFFFFF;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  outline: none;
  transition: 0.18s;
}
.dd-trigger:hover { border-color: var(--pg-accent); }
.dd-trigger:focus-visible,
.dd-trigger.open {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(74, 159, 234, 0.2);
}
.dd-trigger:disabled { opacity: 0.5; cursor: not-allowed; background: #FFFBF4; }
.dd-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dd-caret { flex-shrink: 0; font-size: 10px; color: var(--pg-accent); transition: transform 0.2s; }
.dd-trigger.open .dd-caret { transform: rotate(180deg); }

.dd-portal { position: fixed; z-index: 9999; }
.dd-menu {
  background: #FFFFFF;
  border: 1px solid var(--border-field);
  border-radius: 20px;
  box-shadow: 0 18px 44px rgba(93, 76, 130, 0.24), 0 4px 12px rgba(93, 76, 130, 0.12);
  padding: 6px;
  max-height: min(46vh, 340px);
  overflow-y: auto;
  animation: ddIn 0.16s ease;
}
.dd-portal.up .dd-menu { animation-name: ddInUp; }
@keyframes ddIn { from { opacity: 0; transform: translateY(-6px) scale(0.98); } to { opacity: 1; transform: none; } }
@keyframes ddInUp { from { opacity: 0; transform: translateY(6px) scale(0.98); } to { opacity: 1; transform: none; } }
.dd-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 15px;
  color: var(--text-primary);
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.14s;
}
.dd-option:hover { background: var(--pg-soft); }
.dd-option.sel { background: var(--pg-grad); color: #FFFFFF; font-weight: 600; }
.dd-option.sel:hover { background: var(--pg-grad); }
.dd-option .dd-tick { margin-left: auto; font-size: 13px; opacity: 0; }
.dd-option.sel .dd-tick { opacity: 1; }
.dd-option.disabled { opacity: 0.4; cursor: not-allowed; }

/* ===== 9. 吐司提示 ===== */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(34px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(16px);
  background: rgba(58, 61, 92, 0.94);
  color: #FFFFFF;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  font-size: 14.5px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: 0.26s;
  z-index: 9000;
  max-width: min(88vw, 420px);
  text-align: center;
  line-height: 1.5;
  box-shadow: 0 10px 26px rgba(58, 61, 92, 0.3);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== 10. 页脚与回顶 ===== */
.footer {
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 8px 12px 4px;
  line-height: 1.8;
}
.scroll-top {
  position: fixed;
  right: 20px;
  bottom: calc(24px + env(safe-area-inset-bottom));
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--pg-soft2);
  background: var(--pg-grad);
  color: #FFFFFF;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 8px 20px var(--pg-shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: 0.25s;
  z-index: 500;
}
.scroll-top.show { opacity: 1; pointer-events: auto; transform: none; }

/* ===== 11. 占位 / 空状态 ===== */
.empty {
  text-align: center;
  color: var(--text-secondary);
  padding: 32px 16px;
  font-size: 15px;
  line-height: 1.9;
}
.empty .emoji { display: block; font-size: 44px; margin-bottom: 10px; }

/* ===== 12. 宽屏分档（1920×1080 桌面按 1560 排版） ===== */
@media (min-width: 900px) { :root { --app-max: 900px; } }
@media (min-width: 1100px) { :root { --app-max: 1020px; } }
@media (min-width: 1400px) { :root { --app-max: 1140px; } }
@media (min-width: 1700px) { :root { --app-max: 1240px; } }
/* 点读页是密集网格，宽屏单独放宽 */
@media (min-width: 1400px) { body.page-point { --app-max: 1320px; } }
@media (min-width: 1700px) { body.page-point { --app-max: 1560px; } }

@media (min-width: 1400px) {
  .card { padding: 22px 26px; }
  .card-title { font-size: 18px; }
  .btn { font-size: 15.5px; }
}

/* ===== 13. 移动端（主流 360 / 390 / 414 / 430） ===== */
@media (max-width: 820px) {
  .nav-brand .brand-text { display: none; }
  .nav-brand { padding: 0 2px 0 4px; }
}
@media (max-width: 640px) {
  body { padding: 0 10px calc(24px + env(safe-area-inset-bottom)); }
  .card { padding: 15px 16px; border-radius: 20px; margin-bottom: 12px; }
  .card-title { font-size: 15.5px; margin-bottom: 12px; }
  .nav { padding: 5px; gap: 5px; }
  .nav-item { font-size: 14px; padding: 8px 4px; gap: 4px; min-height: 40px; }
  .btn { font-size: 14px; padding: 9px 16px; min-height: 40px; }
  .btn.sm { font-size: 13px; padding: 6px 12px; min-height: 32px; }
  .dd-trigger { min-height: 40px; font-size: 14px; padding: 7px 13px; }
  .toast { bottom: calc(22px + env(safe-area-inset-bottom)); font-size: 13.5px; }
  .scroll-top { right: 14px; bottom: calc(18px + env(safe-area-inset-bottom)); width: 42px; height: 42px; font-size: 18px; }
}
@media (max-width: 430px) {
  .nav-brand { display: none; }
  .nav-item { font-size: 13.5px; letter-spacing: -0.2px; }
}
@media (max-width: 360px) {
  .nav-item { font-size: 12.5px; padding: 8px 2px; }
  .btn { font-size: 13px; padding: 8px 12px; }
}