/* =========================================================
   墨卡 · 设计系统
   ------------------------------------------------------------
   取向：宣纸与墨。
   不使用渐变、玻璃模糊、大圆角与彩色背景 —— 那些是「AI 生成感」的来源。
   改为：暖白纸底、墨色文字、细发丝线、朱砂点缀、宋体承载正文。
   层次靠留白与字重建立，而非阴影与色块。
   ========================================================= */

:root {
  /* —— 纸与墨 —— */
  --paper: #f4f1ea;
  --paper-2: #faf8f4;
  --card: #fffdfa;
  --ink: #1e1c19;
  --ink-2: #4a453e;
  /* 次级小字：对宣纸底约 4.6:1（≥4.5:1 达标） */
  --ink-3: #736c63;
  /* 弱化标注：约 3:1，只用于序号、占位符一类非正文 */
  --ink-4: #8f877c;

  /* —— 线 —— */
  --line: #e2ddd2;
  --line-2: #d3ccbd;
  --line-3: #bdb4a2;

  /* —— 点缀：朱砂印 —— */
  --seal: #9c3d2e;
  --seal-soft: rgba(156, 61, 46, .09);
  --seal-line: rgba(156, 61, 46, .28);

  /* —— 语义 —— */
  --jade: #4a7c59;
  --jade-soft: rgba(74, 124, 89, .1);
  /* 青玉浓度阶梯：热力图等需要分档的场合，不再就地写 rgba */
  --jade-1: rgba(74, 124, 89, .28);
  --jade-2: rgba(74, 124, 89, .5);
  --jade-3: rgba(74, 124, 89, .72);
  --indigo: #3f5a7d;
  --indigo-soft: rgba(63, 90, 125, .09);
  --amber: #9a6b1f;
  --amber-soft: rgba(154, 107, 31, .1);

  /* —— 排版 —— */
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", Consolas, "DejaVu Sans Mono", "Noto Sans Mono", "Courier New", monospace;

  /* —— 尺度：小圆角，靠线不靠影 —— */
  --r-xs: 3px;
  --r-sm: 5px;
  --r: 7px;
  --r-lg: 10px;

  /* —— 间距：4px 节奏。组件内 s-3/s-4，卡片 s-4/s-5，区块之间 s-5/s-6 —— */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;

  /* —— 字号：正文 15px，小字分档，避免随手写死 —— */
  --fs-xs: 12px;
  --fs-sm: 12.5px;
  --fs-md: 13.5px;
  --fs-lg: 15.5px;
  --fs-xl: 21px;

  /* —— 阴影：极轻，只用于浮层；卡片悬停用 sh-hover，常态靠边线 —— */
  --lift: 0 1px 2px rgba(40, 34, 24, .05);
  --lift-2: 0 4px 16px rgba(40, 34, 24, .09), 0 1px 3px rgba(40, 34, 24, .06);
  --lift-3: 0 12px 40px rgba(40, 34, 24, .14), 0 2px 8px rgba(40, 34, 24, .07);
  --sh-hover: 0 6px 18px rgba(40, 34, 24, .1), 0 1px 3px rgba(40, 34, 24, .05);

  --fs-poem: 1.2rem;
  --anim: 1;
  --sidebar-w: 216px;
  --topbar-h: 58px;
  /* 纸纹纤维色：body::before 的氛围层读它，主题切换时同步换色 */
  --fiber: rgba(120, 105, 80, .018);
  /* 纸墨透明底色：悬停 / 凹槽一类的极浅底，统一走这里，不再散落 rgba */
  --paper-tint: rgba(120, 105, 80, .07);
  --paper-tint-2: rgba(120, 105, 80, .05);
  /* 键盘焦点环 */
  --focus: rgba(156, 61, 46, .5);
}

html[data-theme="dark"] {
  --paper: #14130f;
  --paper-2: #1a1815;
  --card: #201d19;
  --ink: #ece7dd;
  --ink-2: #b8b1a5;
  --ink-3: #8b8479;
  --ink-4: #6b645b;

  --line: #302c26;
  --line-2: #3d382f;
  --line-3: #4f483d;

  --seal: #c9705c;
  --seal-soft: rgba(201, 112, 92, .13);
  --seal-line: rgba(201, 112, 92, .34);

  --jade: #7aa88a;
  --jade-soft: rgba(122, 168, 138, .12);
  --jade-1: rgba(122, 168, 138, .3);
  --jade-2: rgba(122, 168, 138, .52);
  --jade-3: rgba(122, 168, 138, .74);
  --indigo: #8aa6c8;
  --indigo-soft: rgba(138, 166, 200, .12);
  --amber: #c9a05c;
  --amber-soft: rgba(201, 160, 92, .12);

  /* 暗色阴影同样只走 token，统一由 --lift* / --sh-hover 控制 */
  --lift: 0 1px 2px rgba(0, 0, 0, .3);
  --lift-2: 0 4px 16px rgba(0, 0, 0, .4), 0 1px 3px rgba(0, 0, 0, .3);
  --lift-3: 0 12px 40px rgba(0, 0, 0, .55), 0 2px 8px rgba(0, 0, 0, .4);
  --sh-hover: 0 6px 18px rgba(0, 0, 0, .45), 0 1px 3px rgba(0, 0, 0, .3);

  /* 暗色纸纹换成偏冷的浅纤维，否则暖棕纤维在深底上几乎不可见 */
  --fiber: rgba(226, 221, 210, .022);
  --paper-tint: rgba(226, 221, 210, .07);
  --paper-tint-2: rgba(226, 221, 210, .05);
  --focus: rgba(201, 112, 92, .6);
}

/* =========================================================
   基础
   ========================================================= */
* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
  overflow-x: hidden;
}

/* 纸纹：极淡的横向纤维，替代渐变装饰（颜色走 --fiber，随主题变化） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
  background-image: repeating-linear-gradient(
    0deg,
    var(--fiber) 0 1px,
    transparent 1px 3px
  );
}
html[data-theme="dark"] body::before { opacity: .35; }

body.no-anim *, body.no-anim *::before, body.no-anim *::after {
  animation-duration: .001ms !important;
  transition-duration: .001ms !important;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}

button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
.hidden { display: none !important; }

/* 键盘焦点环：朱砂半透明，圆角跟随元素自身（这里不再改写 radius） */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

::selection { background: var(--seal-soft); }

/* 数字用等宽，避免跳动 */
.hstat b, .ring-label, .bc-count, .pr-idx { font-variant-numeric: tabular-nums; }

/* =========================================================
   排版工具
   ========================================================= */
.tiny { font-size: var(--fs-xs); }
.muted { color: var(--ink-3); }
.center { text-align: center; }
.row { display: flex; align-items: center; }
.row-wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.spacer { flex: 1; }
.serif { font-family: var(--serif); }

/* =========================================================
   按钮：矩形、细线、无渐变
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  height: 34px;
  padding: 0 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--card);
  color: var(--ink-2);
  font-size: var(--fs-md);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color .16s, color .16s, background .16s, transform .1s;
}
.btn:hover { border-color: var(--line-3); color: var(--ink); background: var(--paper-2); }
.btn:active { transform: translateY(.5px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn:disabled:hover { border-color: var(--line-2); color: var(--ink-2); background: var(--card); }
.btn svg { flex: none; }

.btn-primary { background: var(--ink); border-color: var(--ink); color: var(--paper-2); }
.btn-primary:hover { background: #2c2925; border-color: #2c2925; color: #fff; }
html[data-theme="dark"] .btn-primary { background: var(--ink); border-color: var(--ink); color: #16140f; }
html[data-theme="dark"] .btn-primary:hover { background: #fff; border-color: #fff; color: #16140f; }

.btn-seal { background: var(--seal); border-color: var(--seal); color: #fff; }
.btn-seal:hover { background: #8a3427; border-color: #8a3427; color: #fff; }

.btn-ok { color: var(--jade); border-color: var(--jade); background: var(--jade-soft); }
.btn-ok:hover { background: var(--jade); color: #fff; border-color: var(--jade); }

.btn-ghost { border-color: transparent; background: transparent; }
.btn-ghost:hover { background: var(--paper-tint); border-color: transparent; }

.btn-sm { height: 28px; padding: 0 10px; font-size: 12.5px; }
.btn-lg { height: 40px; padding: 0 18px; font-size: 15px; }
.btn-block { display: flex; width: 100%; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  transition: background .16s, color .16s;
}
.icon-btn:hover { background: var(--paper-tint); color: var(--ink); }

/* =========================================================
   卡片与区块
   ========================================================= */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: var(--s-4);
}
.card.pad-lg { padding: var(--s-5) var(--s-6); }

.card-title {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink-2);
  margin-bottom: var(--s-3);
}
.card-title svg { color: var(--ink-3); flex: none; }
.card-title .sub { margin-left: auto; font-size: var(--fs-xs); font-weight: 400; color: var(--ink-4); }

.section { margin-bottom: var(--s-5); }
.section-head {
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
  margin-bottom: var(--s-4);
  padding-bottom: var(--s-3);
  border-bottom: 1px solid var(--line);
}
.section-head h2 {
  position: relative;
  margin: 0;
  padding-left: 12px;
  font-family: var(--serif);
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: .04em;
}
/* 印章风题头：一道朱砂短竖，替代花哨装饰 */
.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: .32em;
  width: 3px;
  height: .82em;
  background: var(--seal);
  border-radius: 1px;
}
.section-head .muted { margin-left: auto; }

.grid { display: grid; gap: var(--s-3); }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* =========================================================
   徽标 / 状态
   ========================================================= */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 21px;
  padding: 0 8px;
  border: 1px solid var(--line-2);
  border-radius: 3px;
  background: transparent;
  color: var(--ink-3);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .02em;
  white-space: nowrap;
}
.pill.done { color: var(--jade); border-color: var(--jade); background: var(--jade-soft); }
.pill.doing { color: var(--amber); border-color: var(--amber); background: var(--amber-soft); }
.pill.lock { color: var(--ink-4); }
.pill.seal { color: var(--seal); border-color: var(--seal-line); background: var(--seal-soft); }

.progress-line { height: 3px; background: var(--line); border-radius: 2px; overflow: hidden; }
.progress-line > i {
  display: block;
  height: 100%;
  background: var(--jade);
  border-radius: 2px;
  transition: width .5s cubic-bezier(.2, .7, .3, 1);
}
.progress-line.done > i { background: var(--jade); }

/* =========================================================
   登录
   ========================================================= */
.auth-screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 384px;
  background: var(--card);
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  padding: 34px 32px 28px;
  box-shadow: var(--lift);
}
.auth-brand { text-align: center; margin-bottom: 24px; }
.auth-logo {
  width: 46px;
  height: 46px;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  background: var(--seal);
  color: #fff;
  border-radius: var(--r-sm);
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
}
.auth-brand h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .1em;
}
.auth-brand p { margin: 6px 0 0; font-size: 12.5px; color: var(--ink-3); letter-spacing: .06em; }

.tabs {
  display: flex;
  gap: 2px;
  padding: 2px;
  margin-bottom: 20px;
  background: var(--paper-tint);
  border-radius: var(--r-sm);
}
.tab {
  flex: 1;
  height: 30px;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: var(--ink-3);
  font-size: 13.5px;
  cursor: pointer;
  transition: background .16s, color .16s;
}
.tab.active { background: var(--card); color: var(--ink); box-shadow: var(--lift); }

.field { display: block; margin-bottom: 14px; }
.field > span {
  display: block;
  margin-bottom: 6px;
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: .03em;
}
.field input, .field select, .field textarea {
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  color: var(--ink);
  transition: border-color .16s, background .16s;
}
.field textarea { height: auto; padding: 10px 12px; line-height: 1.6; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--ink-3);
  background: var(--card);
}

.auth-msg { min-height: 20px; margin: 0 0 10px; font-size: 12.5px; color: var(--seal); }
.auth-tip {
  margin: 18px 0 0;
  text-align: center;
  font-size: 11.5px;
  color: var(--ink-4);
  line-height: 1.7;
}

/* =========================================================
   应用骨架
   ========================================================= */
.app { position: relative; z-index: 1; min-height: 100vh; min-height: 100dvh; }

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  padding: 18px 12px;
  border-right: 1px solid var(--line);
  background: var(--paper-2);
  z-index: 40;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 6px 16px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.brand-logo {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--seal);
  color: #fff;
  border-radius: var(--r-xs);
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  flex: none;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.brand-text b { font-family: var(--serif); font-size: 15.5px; letter-spacing: .08em; }
.brand-text small { font-size: 10.5px; color: var(--ink-4); letter-spacing: .04em; }

.nav { display: flex; flex-direction: column; gap: 1px; flex: 1; overflow-y: auto; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 36px;
  padding: 0 10px;
  border-radius: var(--r-sm);
  color: var(--ink-2);
  font-size: 14px;
  transition: background .15s, color .15s;
}
.nav-item:hover { background: var(--paper-tint); color: var(--ink); }
.nav-item.active { background: var(--ink); color: var(--paper-2); }
.nav-item svg { flex: none; opacity: .8; }
.nav-item .nt { flex: 1; min-width: 0; }

.side-foot { padding-top: 12px; border-top: 1px solid var(--line); }
.streak-mini {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 7px;
  border-radius: var(--r-sm);
  background: var(--paper-tint-2);
  font-size: 13px;
}
.streak-mini svg { color: var(--seal); }
.streak-mini small { color: var(--ink-3); font-size: 11px; }

.main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
}
@supports not (backdrop-filter: blur(1px)) { .topbar { background: var(--paper); } }

.search-wrap { position: relative; flex: 1; max-width: 380px; }
.search-wrap input {
  width: 100%;
  height: 34px;
  padding: 0 12px 0 34px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--card);
  font-size: 13.5px;
  transition: border-color .16s;
}
.search-wrap input:focus { outline: none; border-color: var(--ink-3); }
.search-wrap > .search-ico {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  color: var(--ink-4);
  pointer-events: none;
}

.search-pop {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  max-height: 60vh;
  overflow-y: auto;
  padding: 5px;
  background: var(--card);
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  box-shadow: var(--lift-2);
  z-index: 50;
}
.search-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: var(--r-xs);
  cursor: pointer;
  font-size: 13.5px;
}
.search-item:hover { background: var(--paper-tint); }
.search-item svg { color: var(--ink-4); flex: none; }
.search-item .t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.search-item .d { color: var(--ink-4); font-size: 12px; flex: none; }

.top-right { display: flex; align-items: center; gap: 6px; margin-left: auto; }

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 10px 0 4px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--card);
  cursor: pointer;
  transition: border-color .16s;
}
.user-chip:hover { border-color: var(--line-3); }
.avatar {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--paper-2);
  border-radius: 3px;
  font-family: var(--serif);
  font-size: 13px;
  flex: none;
}
.uname { font-size: 13px; max-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.view {
  flex: 1;
  padding: 26px 24px 40px;
  max-width: 1100px;
  width: 100%;
}

/* =========================================================
   古诗文：分册
   ========================================================= */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: 12px;
}

.book-card {
  position: relative;
  display: block;
  padding: 18px 18px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .18s, transform .18s;
}
.book-card:hover { border-color: var(--line-3); transform: translateY(-2px); }
.book-card:hover .bc-arrow { opacity: 1; transform: translateX(0); }

.bc-top { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 4px; }
.bc-name {
  font-family: var(--serif);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: .05em;
  line-height: 1.4;
}
.bc-arrow {
  margin-left: auto;
  color: var(--ink-4);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity .18s, transform .18s;
  flex: none;
}
.bc-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--ink-3);
  margin-bottom: 12px;
}
.bc-bar { height: 3px; background: var(--line); border-radius: 2px; overflow: hidden; margin-bottom: 8px; }
.bc-bar > i { display: block; height: 100%; background: var(--jade); border-radius: 2px; transition: width .6s cubic-bezier(.2,.7,.3,1); }
.bc-foot { display: flex; align-items: center; justify-content: space-between; font-size: 11.5px; color: var(--ink-4); }

/* =========================================================
   古诗文：篇目列表
   ========================================================= */
.poem-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.poem-row:hover { border-color: var(--line-3); background: var(--paper-2); }

.pr-idx {
  width: 26px;
  flex: none;
  font-size: 12px;
  color: var(--ink-4);
  text-align: right;
}
.pr-main { flex: 1; min-width: 0; }
.pr-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--serif);
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: .03em;
  margin-bottom: 2px;
}
.pr-title svg { color: var(--seal); flex: none; }
.pr-sub { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-3); }
.pr-sub .dot { color: var(--line-3); }
.pr-tail { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; flex: none; }
.pr-open { color: var(--ink-4); flex: none; }
.poem-row:hover .pr-open { color: var(--ink-2); }

.poem-list { display: flex; flex-direction: column; gap: 7px; }

/* =========================================================
   古诗文：详情页
   ========================================================= */
.poem-page { max-width: 780px; margin: 0 auto; }

.pp-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 22px;
  padding: 5px 10px 5px 7px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink-3);
  font-size: 13px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.pp-back:hover { background: var(--paper-tint); color: var(--ink); }

.pp-title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.3;
}
.pp-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-3);
}
.pp-meta .sep { color: var(--line-3); }
.pp-meta .seal-tag {
  font-family: var(--serif);
  color: var(--seal);
  border-bottom: 1px solid var(--seal-line);
}

/* 操作栏：细线分组 */
.pp-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 14px 0;
  margin: 16px 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
/* 操作栏内的次要按钮默认透明底，但强调按钮必须保留实底，
   否则 .pp-acts .btn（0-2-0）会盖掉 .btn-seal / .btn-ok（0-1-0）的底色。 */
.pp-acts .btn { background: transparent; }
.pp-acts .btn:hover { background: var(--card); }
.pp-acts .btn-primary,
.pp-acts .btn-seal,
.pp-acts .btn-ok { background: var(--ink); border-color: var(--ink); color: var(--paper-2); }
.pp-acts .btn-seal { background: var(--seal); border-color: var(--seal); color: #fff; }
.pp-acts .btn-ok { background: var(--jade-soft); border-color: var(--jade); color: var(--jade); }
.pp-acts .btn-primary:hover,
.pp-acts .btn-seal:hover,
.pp-acts .btn-ok:hover { background: #2c2925; border-color: #2c2925; color: #fff; }
.pp-acts .btn-seal:hover { background: #8a3427; border-color: #8a3427; }
.pp-acts .btn-ok:hover { background: var(--jade); border-color: var(--jade); }

/* 标签页：下划线式 */
.tabs-line {
  display: flex;
  gap: 2px;
  margin: 22px 0 20px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs-line::-webkit-scrollbar { display: none; }
.tab-line {
  position: relative;
  flex: none;
  height: 36px;
  padding: 0 14px;
  border: none;
  background: transparent;
  color: var(--ink-3);
  font-size: 13.5px;
  cursor: pointer;
  transition: color .16s;
}
.tab-line:hover { color: var(--ink-2); }
.tab-line.active { color: var(--ink); font-weight: 500; }
.tab-line.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -1px;
  height: 2px;
  background: var(--seal);
  border-radius: 1px;
}

/* 正文：宋体、宽松行距、可点句子 */
.poem-text {
  font-family: var(--serif);
  font-size: var(--fs-poem);
  line-height: 2.15;
  letter-spacing: .02em;
  color: var(--ink);
}
.poem-text .para { margin-bottom: 1.1em; }

.pt-line {
  display: block;
  width: 100%;
  padding: 3px 10px;
  margin: 0 -10px;
  border: none;
  border-left: 2px solid transparent;
  background: transparent;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  transition: background .16s, border-color .16s;
}
.pt-line:hover { background: var(--paper-tint-2); border-left-color: var(--line-3); }
.pt-line.open { background: var(--seal-soft); border-left-color: var(--seal); }
.pt-line.active { background: var(--amber-soft); border-left-color: var(--amber); }

/* 注释展开 */
.pt-note {
  margin: 8px 0 6px;
  padding: 13px 15px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--seal-line);
  border-radius: var(--r-xs);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.75;
}
.pt-note dl { margin: 0; display: grid; grid-template-columns: 44px 1fr; gap: 5px 10px; }
.pt-note dt { color: var(--ink-4); font-size: 12.5px; }
.pt-note dd { margin: 0; color: var(--ink-2); }
.pt-note .acts { display: flex; gap: 6px; margin-top: 11px; padding-top: 11px; border-top: 1px dashed var(--line-2); }

.pt-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  margin-bottom: 20px;
  background: var(--paper-tint-2);
  border-radius: var(--r-sm);
  color: var(--ink-3);
  font-size: 12.5px;
}

/* 字词 */
.kv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 8px; }
.kv {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}
.kv b {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--seal);
  flex: none;
}
.kv span { font-size: 12.5px; color: var(--ink-2); line-height: 1.5; }

/* 可勾选的字词卡：右上角一枚勾，勾上后朱砂描边 */
button.kv {
  position: relative;
  width: 100%;
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: border-color .16s, background .16s;
}
button.kv:hover { border-color: var(--seal-line); background: var(--card); }
.kv-tick {
  position: absolute;
  top: 8px;
  right: 9px;
  color: var(--seal);
  opacity: 0;
  transition: opacity .16s;
}
button.kv.on {
  border-color: var(--seal);
  background: var(--seal-soft);
}
button.kv.on .kv-tick { opacity: 1; }

.pick-answer .card-title { margin-bottom: 10px; }
.pick-answer .msg { white-space: pre-wrap; line-height: 1.8; }

/* 勾选后的底部操作条 */
.pick-bar {
  position: sticky;
  bottom: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 10px 12px 10px 16px;
  background: color-mix(in srgb, var(--card) 96%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  box-shadow: var(--lift-2);
}
.pick-bar[hidden] { display: none; }
.pb-label {
  flex: 1;
  min-width: 0;
  font-size: 12.5px;
  color: var(--ink-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pb-label b { color: var(--seal); font-weight: 600; }

/* 勾选后就地的 AI 回答 */
.pick-answer {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--seal-line);
  border-radius: var(--r-sm);
}

/* 单元分组标题（古诗文单元分隔线与单词册标题共用一处定义） */
.unit-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 10px;
}
.unit-head:first-child { margin-top: 4px; }
.unit-head h3 { margin: 0; font-family: var(--serif); font-size: 15px; font-weight: 600; letter-spacing: .04em; }
.unit-head .progress-line { flex: 1; }
.uh-line { flex: 1; height: 1px; background: var(--line); }
.uh-name { font-size: 12.5px; color: var(--ink-2); letter-spacing: .04em; flex: none; }
.uh-count { font-size: 11.5px; color: var(--ink-4); flex: none; }

/* 默写题 */
.dict-card {
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  margin-bottom: 10px;
}
.dict-q { font-family: var(--serif); font-size: 15.5px; line-height: 1.85; margin-bottom: 12px; }
.dict-a {
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--seal);
  padding: 11px 14px;
  background: var(--seal-soft);
  border-radius: var(--r-sm);
}

/* 赏析 / 提示：正文可读排版 */
.prose {
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 2.05;
  color: var(--ink-2);
  white-space: pre-wrap;
}
.prose-tight { line-height: 1.95; }

/* =========================================================
   通用：首页 / 统计 / 单词
   ========================================================= */
.hero {
  padding: 26px 28px;
  margin-bottom: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.hero h1 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: .05em;
}
.hero > p { margin: 0 0 20px; font-size: 13.5px; color: var(--ink-3); }

.ring-row { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 30px; flex-wrap: wrap; flex: 1; }
.hstat { display: flex; flex-direction: column; gap: 1px; }
.hstat b {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: .01em;
  line-height: 1.25;
}
.hstat small { font-size: 11.5px; color: var(--ink-4); letter-spacing: .03em; }

.ring { position: relative; width: 92px; height: 92px; flex: none; }
.ring svg { transform: rotate(-90deg); display: block; }
.ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 600;
}
.ring-label small { font-size: 10px; color: var(--ink-4); font-weight: 400; letter-spacing: .04em; }

.mini-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  cursor: pointer;
  transition: border-color .16s, transform .16s;
}
.mini-card:hover { border-color: var(--line-3); transform: translateY(-2px); }
.mini-card .ico {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  color: var(--ink-2);
  flex: none;
}
.mini-card b { display: block; font-size: 14px; font-weight: 500; }
.mini-card small { display: block; font-size: 11.5px; color: var(--ink-4); margin-top: 1px; }

.prog-row { display: flex; align-items: center; gap: 12px; }
.prog-row .nm { width: 104px; flex: none; font-size: 13.5px; }
.prog-row .vl { width: 128px; flex: none; text-align: right; font-size: 11.5px; color: var(--ink-4); }

.bars { display: flex; align-items: flex-end; gap: 8px; height: 108px; padding-top: 8px; }
.bars .bar { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; min-width: 0; }
.bars .bar i {
  display: block;
  width: 100%;
  max-width: 30px;
  background: var(--ink-3);
  border-radius: 2px 2px 0 0;
  min-height: 2px;
  transition: height .5s cubic-bezier(.2,.7,.3,1);
}
.bars .bar span { font-size: 10.5px; color: var(--ink-4); white-space: nowrap; }

.heat { display: flex; gap: 3px; overflow-x: auto; padding-bottom: 4px; }
.heat-col { display: flex; flex-direction: column; gap: 3px; }
.heat-cell { width: 11px; height: 11px; border-radius: 2px; background: var(--line); }
.heat-cell.l1 { background: var(--jade-1); }
.heat-cell.l2 { background: var(--jade-2); }
.heat-cell.l3 { background: var(--jade-3); }
.heat-cell.l4 { background: var(--jade); }
.heat-legend {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--ink-4);
}
.heat-legend .heat-cell { width: 9px; height: 9px; flex: none; }
.heat-legend > span:first-child { margin-right: 2px; }
.heat-legend > span:last-child { margin-left: 2px; }

.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(148px, 1fr)); gap: 8px; }
.ach {
  padding: 14px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  text-align: center;
  opacity: .5;
  transition: opacity .2s;
}
.ach.got { opacity: 1; border-color: var(--seal-line); background: var(--seal-soft); }
.ach .em {
  width: 32px;
  height: 32px;
  margin: 0 auto 8px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  color: var(--ink-3);
}
.ach.got .em { border-color: var(--seal-line); color: var(--seal); }
.ach b { display: block; font-size: 13px; font-weight: 500; }
.ach small { display: block; font-size: 10.5px; color: var(--ink-4); margin-top: 2px; }

.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(148px, 1fr)); gap: 8px; }
.word-card {
  padding: 12px 13px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.word-card:hover { border-color: var(--line-3); transform: translateY(-2px); }
.word-card.starred { border-color: var(--seal-line); }
.word-card .w { font-family: var(--serif); font-size: 15px; font-weight: 600; }
.word-card .ph { font-family: var(--mono); font-size: 10.5px; color: var(--ink-4); }
.word-card .cn { font-size: 12.5px; color: var(--ink-2); }
.word-card .ex { font-size: 11px; color: var(--ink-4); margin-top: 5px; line-height: 1.5; }
.word-card .star { color: var(--ink-4); }
.word-card.starred .star { color: var(--seal); }
.lv { display: flex; gap: 2px; margin-bottom: 6px; }
.lv i { width: 13px; height: 2px; border-radius: 1px; background: var(--line-2); }
.lv i.on { background: var(--jade); }

/* 单词分册切换：横向 pill 行 */
.book-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.book-tab {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: var(--card);
  color: var(--ink-2);
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color .16s, color .16s, background .16s;
}
.book-tab:hover { border-color: var(--line-3); color: var(--ink); }
.book-tab.active { border-color: var(--seal); color: var(--seal); background: var(--seal-soft); }

.study-wrap { max-width: 720px; margin: 0 auto; text-align: center; }
.study-actions { display: flex; justify-content: center; gap: 8px; margin-top: 24px; flex-wrap: wrap; }

.flash {
  position: relative;
  min-height: 200px;
  display: grid;
  place-items: center;
  padding: 34px 26px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-family: var(--serif);
  font-size: 22px;
  line-height: 2;
  cursor: pointer;
  user-select: none;
}
/* 翻面：正面（单词大字+音标）/ 反面（中文释义）淡入淡出切换 */
.flash-face { transition: opacity .22s ease; }
.big-w {
  font-family: var(--serif);
  font-size: 2.15rem;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1.35;
}
.big-ph {
  margin: 2px 0 12px;
  font-family: var(--mono);
  font-size: .95rem;
  color: var(--ink-4);
  line-height: 1.6;
}
.big-cn {
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.8;
}
.flash-back {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 30px 26px;
  background: var(--paper-2);
  border-radius: var(--r);
  font-size: 15px;
  line-height: 2;
  font-family: var(--sans);
  color: var(--ink-2);
  opacity: 0;
  pointer-events: none;
}
.flash.flip .flash-face:not(.flash-back) { opacity: 0; pointer-events: none; }
.flash.flip .flash-back { opacity: 1; pointer-events: auto; }

.blank {
  display: inline-block;
  min-width: 34px;
  padding: 0 4px;
  margin: 0 1px;
  border-bottom: 1.5px solid var(--line-3);
  text-align: center;
  color: var(--ink);
}
.blank.empty { border-bottom-color: var(--seal); }
.blank-input {
  width: 100%;
  min-height: 108px;
  padding: 12px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 2.1;
  resize: vertical;
}
.blank-input:focus { outline: none; border-color: var(--ink-3); }

/* 挖空练习的单字格：行内小方格，不再是 textarea 大块 */
.char-input {
  width: 2.2em;
  height: 1.85em;
  margin: 0 1px;
  padding: 0 2px;
  border: 1px solid var(--line-3);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  font-family: var(--serif);
  font-size: 1em;
  text-align: center;
  color: var(--ink);
  vertical-align: baseline;
  transition: border-color .16s, background .16s, color .16s;
}
.char-input:focus { outline: none; border-color: var(--seal); background: var(--card); }
.char-input.ok { border-color: var(--jade); background: var(--jade-soft); color: var(--jade); }
.char-input.bad { border-color: var(--seal); background: var(--seal-soft); color: var(--seal); }

/* 通用输入控件：细线框、纸色底、聚焦朱砂描边（与 .btn 同一套设计语言） */
.input {
  width: 100%;
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  color: var(--ink);
  font-size: 13.5px;
  line-height: 1.6;
  transition: border-color .16s, background .16s;
}
select.input { height: 32px; padding: 0 9px; }
.input:focus { outline: none; border-color: var(--seal); background: var(--card); }
.input::placeholder { color: var(--ink-4); }

.chat { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.msg {
  max-width: 88%;
  padding: 11px 15px;
  border-radius: var(--r);
  font-size: 14px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}
.msg.me { align-self: flex-end; background: var(--ink); color: var(--paper-2); }
.msg.ai { align-self: flex-start; background: var(--card); border: 1px solid var(--line); }
.msg.ai.pending { color: var(--ink-4); font-style: italic; }
.composer { display: flex; gap: 8px; align-items: flex-end; }
.composer textarea {
  flex: 1;
  min-height: 40px;
  max-height: 140px;
  padding: 10px 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--card);
  font-size: 14px;
  line-height: 1.6;
  resize: none;
}
.composer textarea:focus { outline: none; border-color: var(--ink-3); }

.ai-quick { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
/* 快捷提问：小 pill 按钮，圆角封顶 --r-lg */
.ai-quick button {
  height: 28px;
  padding: 0 13px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: var(--card);
  color: var(--ink-2);
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color .16s, color .16s, background .16s;
}
.ai-quick button:hover { border-color: var(--seal-line); color: var(--seal); background: var(--seal-soft); }

.set-row { display: flex; align-items: center; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.set-row:last-child { border-bottom: none; }
/* 标题区统一用 .info 一种写法 */
.set-row .info { flex: 1; min-width: 0; }
.set-row .info > b { display: block; font-size: 14px; font-weight: 500; }
.set-row .info > small { display: block; font-size: 11.5px; color: var(--ink-4); margin-top: 3px; line-height: 1.55; }
/* 标签与控件之间留出呼吸空间 */
.set-row > .btn { margin-left: auto; }
.set-row > input,
.set-row > select { margin-left: auto; flex: none; }
.set-row input[type="number"],
.set-row input[type="text"],
.set-row input[type="password"],
.set-row select {
  height: 32px;
  padding: 0 9px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--paper-2);
  font-size: 13px;
}
.set-row input:focus, .set-row select:focus { outline: none; border-color: var(--seal); }
.set-row input[type="range"] { margin-left: auto; flex: none; max-width: 160px; accent-color: var(--seal); }

.switch {
  position: relative;
  width: 40px;
  height: 22px;
  border: 1px solid var(--line-2);
  border-radius: 11px;
  background: var(--paper-2);
  cursor: pointer;
  flex: none;
  transition: background .18s, border-color .18s;
}
.switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-3);
  transition: transform .18s, background .18s;
}
.switch.on { background: var(--jade); border-color: var(--jade); }
.switch.on::after { transform: translateX(18px); background: #fff; }

.seg { display: inline-flex; gap: 2px; padding: 2px; background: var(--paper-tint); border-radius: var(--r-sm); }
.seg button {
  height: 26px;
  padding: 0 11px;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: var(--ink-3);
  font-size: 12.5px;
  cursor: pointer;
}
.seg button.active { background: var(--card); color: var(--ink); box-shadow: var(--lift); }

/* =========================================================
   浮层
   ========================================================= */
.modal-mask {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(30, 26, 20, .42);
  animation: fadeIn .16s ease;
}
.modal {
  width: 100%;
  max-width: 620px;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  box-shadow: var(--lift-3);
  animation: riseIn .2s cubic-bezier(.2,.7,.3,1);
}
.modal-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
  flex: none;
}
.modal-head h3 { margin: 0; font-family: var(--serif); font-size: 16.5px; font-weight: 600; letter-spacing: .04em; }
.modal-body { padding: 18px; overflow-y: auto; flex: 1; }
.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 13px 18px;
  border-top: 1px solid var(--line);
  flex: none;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes riseIn { from { opacity: 0; transform: translateY(10px) scale(.99); } to { opacity: 1; transform: none; } }

.toast-root {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 7px;
  align-items: center;
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  background: var(--ink);
  color: var(--paper-2);
  border-radius: var(--r-sm);
  font-size: 13.5px;
  box-shadow: var(--lift-2);
  animation: toastIn .2s cubic-bezier(.2,.7,.3,1);
  max-width: min(90vw, 420px);
}
.toast.err { background: var(--seal); color: #fff; }
.toast.ok { background: var(--jade); color: #fff; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 60px 0;
  color: var(--ink-3);
  font-size: 13.5px;
}
.spinner {
  width: 17px;
  height: 17px;
  border: 2px solid var(--line-2);
  border-top-color: var(--ink-3);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 54px 20px;
  color: var(--ink-3);
  text-align: center;
}
.empty svg { color: var(--line-3); }
.empty b { font-size: 14.5px; font-weight: 500; color: var(--ink-2); }
.empty small { font-size: 12.5px; }

.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 300; }

/* =========================================================
   备用域名提示
   ========================================================= */
#fallbackTip {
  position: fixed;
  left: 50%;
  top: 18px;
  transform: translateX(-50%);
  z-index: 400;
  max-width: min(92vw, 460px);
}
#fallbackTip[hidden] { display: none; }
.fb-card {
  padding: 13px 16px;
  background: var(--card);
  border: 1px solid var(--seal-line);
  border-radius: var(--r);
  box-shadow: var(--lift-2);
  font-size: 13px;
  line-height: 1.65;
}
.fb-card strong { display: block; font-size: 13.5px; margin-bottom: 4px; }
.fb-card p { margin: 0 0 9px; color: var(--ink-2); }
.fb-card code { font-family: var(--mono); font-size: 12px; color: var(--seal); }
.fb-link {
  display: block;
  margin-bottom: 8px;
  padding: 7px 11px;
  background: var(--seal-soft);
  border-radius: var(--r-sm);
  color: var(--seal);
  font-size: 13px;
  font-weight: 500;
}
.fb-link:hover { background: var(--seal); color: #fff; }
.fb-close { border: none; background: transparent; color: var(--ink-4); font-size: 12px; cursor: pointer; padding: 2px 0; }
.fb-close:hover { color: var(--ink-2); }

/* 加载屏 */
.boot-screen { position: fixed; inset: 0; z-index: 9999; display: grid; place-items: center; background: var(--paper); }
.boot-screen[hidden] { display: none; }
.bs-card { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 30px 40px; text-align: center; }
.bs-logo {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--seal);
  color: #fff;
  border-radius: var(--r-sm);
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  animation: breathe 1.8s ease-in-out infinite;
}
@keyframes breathe { 0%,100% { opacity: 1; } 50% { opacity: .55; } }
.bs-title { margin: 6px 0 0; font-family: var(--serif); font-size: 15px; letter-spacing: .1em; }
.bs-detail { margin: 0; font-size: 12.5px; color: var(--ink-3); max-width: 280px; line-height: 1.65; }
.bs-reset {
  margin-top: 8px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--ink-3);
  font-size: 12.5px;
  padding: 7px 14px;
  border-radius: var(--r-sm);
  cursor: pointer;
}
.bs-reset:hover { border-color: var(--ink-3); color: var(--ink); }

/* =========================================================
   移动端
   ========================================================= */
.only-mobile { display: none; }

/* 侧栏遮罩：仅抽屉化时出现，盖在内容之上、侧栏之下 */
.side-mask { display: none; }

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform .22s cubic-bezier(.2,.7,.3,1);
    box-shadow: var(--lift-3);
  }
  .sidebar.open { transform: none; }
  .side-mask {
    position: fixed;
    inset: 0;
    z-index: 39;
    display: block;
    background: rgba(30, 26, 20, .38);
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s ease, visibility .22s;
  }
  .side-mask.show { opacity: 1; visibility: visible; }
  .main { margin-left: 0; }
  .only-mobile { display: inline-grid; }
  .view { padding: 18px 16px 88px; }
  .topbar { padding: 0 14px; }
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { padding: 20px; }
  .pp-title { font-size: 25px; }
  /* 窄屏正文：字号略降、行距略收，避免每句之间空得像诗集留白 */
  .poem-text { line-height: 1.92; font-size: 1.14rem; }
  .poem-text .para { margin-bottom: .85em; }
  .pt-line { padding: 3px 8px; margin: 0 -8px; }
  /* 勾选字词的浮条：让开底部 tabbar，避免被压住 */
  .pick-bar { bottom: 72px; z-index: 36; }

  .tabbar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 35;
    display: flex;
    background: color-mix(in srgb, var(--paper-2) 95%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    border-top: 1px solid var(--line);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .tabbar a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 2px 7px;
    font-size: 10px;
    color: var(--ink-4);
    transition: color .15s;
  }
  .tabbar a.active { color: var(--ink); }
  .tabbar a svg { width: 19px; height: 19px; }
}

@media (max-width: 560px) {
  .g2, .g3, .g4 { grid-template-columns: minmax(0, 1fr); }
  .book-grid { grid-template-columns: minmax(0, 1fr); }
  .hero-stats { gap: 18px; }
  .hstat b { font-size: 20px; }
  .ring { width: 76px; height: 76px; }
  .ring-label { font-size: 15px; }
  .search-wrap { max-width: none; }
  .uname { display: none; }
  .user-chip { padding: 0 4px; }
  .pr-idx { display: none; }
}

/* 打印：给要打印课文的人留一份干净版 */
@media print {
  .sidebar, .topbar, .tabbar, .pp-acts, .tabs-line, .pt-hint, .toast-root, .pp-back { display: none !important; }
  .main { margin-left: 0; }
  .view { padding: 0; max-width: none; }
  body { background: #fff; }
  .poem-page { max-width: none; }
  .pt-line { padding: 0; border: none; }
  .pt-note { page-break-inside: avoid; }
}