/* ==========================================================================
   daily-book · neo brutalism 设计系统 v1.0
   依据 notes/daily-book-neo-brutalism-spec.md（@Steven，2026-07-18）
   核心：高对比、硬边框、直角、粗阴影、快动效
   ========================================================================== */

/* ========== §1 颜色 token ========== */
:root {
  --bg: #F2F0EA;
  --fg: #0A0A0A;
  --paper: #FFFFFF;
  --accent: #C03A00;
  --accent-alt: #FFCE00;
  --muted: #666666;
  --border: #0A0A0A;

  /* 唯一阴影：硬阴影，无 blur（§3.2） */
  --shadow-card: 6px 6px 0 rgba(10, 10, 10, 0.18);
  --shadow-card-hover: 8px 8px 0 rgba(10, 10, 10, 0.18);
  --shadow-btn: 4px 4px 0 rgba(10, 10, 10, 0.18);
  --shadow-btn-hover: 6px 6px 0 rgba(10, 10, 10, 0.18);
  --shadow-btn-active: 2px 2px 0 rgba(10, 10, 10, 0.18);
  --shadow-lightbox: 8px 8px 0 rgba(10, 10, 10, 0.18);

  /* §2 字体栈 */
  --font-display: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", monospace;

  /* §5 动效 */
  --ease-interact: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ========== Reset ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* 全站直角（§3.1） */
*, *::before, *::after { border-radius: 0 !important; }

/* §8 focus-visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ========== §4.1 页面容器 ========== */
.app-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Skip Link ========== */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  background: var(--accent);
  color: var(--paper);
  border: 2px solid var(--fg);
  padding: 8px 16px;
  z-index: 999;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  transform: translateY(-100%);
  transition: transform 120ms ease-out;
}
.skip-link:focus { transform: translateY(0); }

/* ========== §6.1 Header / 导航 ========== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
  border-bottom: 2px solid var(--fg);
  background: var(--bg);
}

.logo { display: flex; align-items: baseline; gap: 12px; }
.logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.logo-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.header-nav { display: flex; align-items: center; gap: 12px; }
.nav-btn {
  position: relative;
  display: inline-block;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  color: var(--fg);
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out, color 120ms ease-out, background-color 120ms ease-out;
}
.nav-btn:hover {
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}
.nav-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn-active);
}
.nav-btn.active { color: var(--accent); }
.nav-btn.active::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 4px;
  height: 3px;
  background: var(--accent-alt);
}

/* ========== Date Bar ========== */
.date-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 24px;
}
.date-info { display: flex; flex-direction: column; gap: 2px; }
/* P0-1: 期号横条（Neo Brutalism 硬风：粗体大字，视觉权重 > 日期） */
.date-issue {
  font-family: var(--font-mono);
  font-size: 1.375rem;      /* text-2xl */
  font-weight: 900;         /* font-black */
  letter-spacing: 0.02em;
  color: var(--fg);
  line-height: 1.1;
  margin-bottom: 4px;
}
.date-main {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}
.date-reading-day {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.date-nav { display: flex; align-items: center; gap: 8px; }
.date-arrow {
  width: 36px;
  height: 36px;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-family: var(--font-mono);
  font-weight: 700;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out, background-color 120ms ease-out;
}
.date-arrow:hover {
  background: var(--accent-alt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}
.date-arrow:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn-active);
}
.date-arrow.disabled {
  background: var(--muted);
  color: var(--paper);
  box-shadow: var(--shadow-btn-active);
  cursor: not-allowed;
  pointer-events: none;
}

/* ========== §6.2 Hero 卡片 ========== */
.hero-card {
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  animation: pageLoad 200ms ease-out;
}
/* §5.2 页面加载动效 */
@keyframes pageLoad {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-content { display: grid; grid-template-columns: 300px 1fr; min-height: 440px; }

/* 书封：2:3，2px 边框，纯色 placeholder，无渐变（§6.2 / §7） */
.book-cover-section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 44px 36px;
  border-right: 2px solid var(--fg);
}
.book-cover {
  width: 190px;
  height: 270px;
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
  cursor: zoom-in;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}
.book-cover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.book-cover-placeholder {
  width: 100%;
  height: 100%;
  aspect-ratio: 2 / 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 28px;
  text-align: center;
  background: var(--fg);
}
.cover-title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
  line-height: 1.3;
  white-space: pre-line;
}
.cover-divider { width: 32px; height: 2px; background: var(--accent); }
.cover-author {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--accent-alt);
  letter-spacing: 3px;
}

/* 书籍信息 */
.book-info-section {
  padding: 48px 44px 44px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
/* 分类标签：--accent-alt 底 + --fg 字（§1.2） */
.book-category {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 10px;
  background: var(--accent-alt);
  border: 2px solid var(--fg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: 14px;
}
.book-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 10px;
  color: var(--fg);
}
.book-author { font-size: 1rem; color: var(--muted); margin-bottom: 20px; }
.book-author span { color: var(--fg); font-weight: 500; }
.book-desc {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 24px;
  /* task #45 T1：简介展示全不省略，去 3 行 clamp（Victor msg=750633b8） */
}
.book-meta-inline {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-bottom: 28px;
}
/* P1 编辑的话（spec v1.1 §2.3）：desc 裸排、editorNote 装盒——「编辑在说话」与「书的简介」视觉分层 */
.editor-note {
  border: 2px solid var(--border);
  background: var(--paper);
  box-shadow: 4px 4px 0 rgba(10, 10, 10, 0.18);
  padding: 16px 20px;
  margin-bottom: 24px;
}
.editor-note-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.editor-note-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--fg);
  margin: 0;
}
.book-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ========== §6.5 按钮 ========== */
/* task #45：btn-primary/btn-secondary 随收藏/想读/标记已读按钮全删，仅存 btn-rss */
.btn-rss {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  padding: 12px 28px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out, background-color 120ms ease-out;
}
.btn-rss { background: var(--paper); color: var(--fg); }
.btn-rss:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}
.btn-rss:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn-active);
}

/* ========== §6.3 QuoteCard ========== */
.quote-section { margin-top: 24px; animation: pageLoad 200ms ease-out; }
.quote-list-desktop {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 24px;
  animation: pageLoad 200ms ease-out;
}
.quote-card {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
  padding: 44px 48px;
}
/* 左侧 6px --accent 引用竖条 */
.quote-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--accent);
}
.quote-card.stacked { position: relative; flex: none; min-width: 0; }
.quote-mark {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  color: var(--accent);
  line-height: 0.8;
  margin-bottom: 8px;
  user-select: none;
}
.quote-text {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 2;
  color: var(--fg);
  margin-bottom: 20px;
}
.quote-source {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 10px;
}
.quote-source::before { content: ""; width: 28px; height: 2px; background: var(--accent); }
.quote-actions {
  position: absolute;
  right: 48px;
  bottom: 44px;
  display: flex;
  gap: 8px;
}
/* 操作按钮：无边框，hover --accent-alt 底（§6.3） */
.quote-action-btn {
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 120ms ease-out, color 120ms ease-out;
}
.quote-action-btn:hover { background: var(--accent-alt); }

/* ========== Section Header ========== */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.section-more {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--fg);
  cursor: pointer;
  transition: color 120ms ease-out;
}
.section-more:hover { color: var(--accent); }

/* ========== §6.4 HistoryCard ========== */
.history-section {
  margin-top: 64px;
  padding-bottom: 80px;
  animation: pageLoad 200ms ease-out;
}
.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.history-card {
  display: block;
  position: relative;                    /* P0-1: for .issue-badge absolute positioning */
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
  padding: 22px;
  cursor: pointer;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}
.history-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

/* P0-1: 期号徽章 (HistoryGrid 卡片右上角 + archive 卡片右上角，vanilla CSS Neo Brutalism 硬风) */
.issue-badge,
.archive-issue-badge {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 2px 6px;
  background: var(--fg);                 /* Neo Brutalism 主前景色（黑） */
  color: var(--bg, var(--paper));        /* 白 */
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  border: 1.5px solid var(--fg);         /* 硬边风一致 */
  border-radius: 0;                       /* 硬角 */
  box-shadow: 2px 2px 0 var(--fg);       /* Neo Brutalism 硬阴影 */
}
.history-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin-bottom: 10px;
}
.history-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.history-author { font-size: 0.875rem; color: var(--muted); margin-bottom: 12px; }
.history-quote {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========== §6.9 Footer ========== */
.footer {
  border-top: 2px solid var(--fg);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.footer a { color: var(--fg); transition: color 120ms ease-out; }
.footer a:hover { color: var(--accent); }

/* ========== §6.8 Toast ========== */
.toast {
  position: fixed;
  z-index: 1000;
  background: var(--fg);
  color: var(--paper);
  border: 2px solid var(--accent-alt);
  box-shadow: var(--shadow-btn);
  padding: 14px 28px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  opacity: 0;
  pointer-events: none;
  transition: transform 160ms ease-out, opacity 160ms ease-out;
}
/* 桌面：右下角 */
@media (min-width: 769px) {
  .toast { right: 24px; bottom: 24px; transform: translateY(8px); }
  .toast.show { transform: translateY(0); opacity: 1; }
}
/* 移动：底部居中 */
@media (max-width: 768px) {
  .toast {
    left: 50%;
    bottom: calc(72px + env(safe-area-inset-bottom, 0px));
    transform: translateX(-50%) translateY(8px);
  }
  .toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* ========== §6.6 Cover Lightbox ========== */
.cover-lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 120ms ease-in, visibility 120ms ease-in;
}
.cover-lightbox.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 160ms ease-out, visibility 160ms ease-out;
}
.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.92);
}
.lightbox-content {
  position: relative;
  z-index: 1;
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.96);
  transition: transform 120ms ease-in;
}
.cover-lightbox.active .lightbox-content {
  transform: scale(1);
  transition: transform 160ms ease-out;
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 120ms ease-out, transform 120ms ease-out, box-shadow 120ms ease-out;
}
.lightbox-close:hover {
  background: var(--accent-alt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}
.lightbox-close:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn-active);
}
/* lightbox 内容：4px 边框 + 8px 阴影（§6.6） */
.book-cover.enlarged {
  width: 280px;
  height: 400px;
  border: 4px solid var(--fg);
  box-shadow: var(--shadow-lightbox);
  transform: none !important;
  cursor: default;
}
.book-cover.enlarged:hover { box-shadow: var(--shadow-lightbox); }
.book-cover.enlarged .cover-title { font-size: 36px; }
.book-cover.enlarged .cover-author { font-size: 14px; }

@media (max-width: 768px) {
  .book-cover.enlarged { width: 240px; height: 340px; }
  .book-cover.enlarged .cover-title { font-size: 30px; }
}

/* ========== §6.1 移动端顶部导航（task #41：自底部上移，static 随文档流滚走） ========== */
.mobile-nav {
  background: var(--paper);
  border-bottom: 2px solid var(--fg);
  display: none;
  /* task #41 Steven 定稿：分区线贯通全宽（负 margin 顶开 app-container 16px padding），
     tab 内容保持 16px 内缩与正文栅格对齐 */
  margin: 0 -16px;
}
.mobile-nav-list {
  display: flex;
  justify-content: space-around;
  align-items: stretch;
  list-style: none;
  padding: 0 16px;
  margin: 0;
}
.mobile-nav-item { flex: 1; text-align: center; }
.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 12px;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 120ms ease-out, background-color 120ms ease-out;
}
.mobile-nav-link:hover { color: var(--accent); }
/* 激活项 --accent-alt 背景（§6.1） */
.mobile-nav-link.active {
  background: var(--accent-alt);
  color: var(--fg);
}

/* ========== §5.2 轮播 snap ========== */
.quote-swipe-container {
  position: relative;
  overflow: hidden;
  touch-action: pan-y;
  margin-top: 24px;
}
.quote-swipe-track {
  display: flex;
  transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.quote-swipe-track .quote-card { flex: 0 0 100%; min-width: 100%; }
.quote-swipe-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}
.quote-swipe-dot {
  width: 10px;
  height: 10px;
  background: var(--paper);
  border: 2px solid var(--fg);
  cursor: pointer;
  transition: background-color 120ms ease-out;
}
.quote-swipe-dot.active { background: var(--accent); }
.quote-swipe-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-top: 12px;
}

@media (min-width: 769px) {
  .quote-swipe-container,
  .quote-swipe-hint,
  .quote-swipe-dots { display: none; }
}
@media (max-width: 768px) {
  .quote-list-desktop { display: none; }
}

/* ========== Share Image Modal（§6.6 同 lightbox 语言） ========== */
.share-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 120ms ease-in, visibility 120ms ease-in;
}
.share-modal.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 160ms ease-out, visibility 160ms ease-out;
}
.share-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.92);
}
.share-modal-content {
  position: relative;
  z-index: 1;
  background: var(--paper);
  border: 4px solid var(--fg);
  box-shadow: var(--shadow-lightbox);
  padding: 28px;
  max-width: 400px;
  width: 90%;
  transform: scale(0.96);
  transition: transform 120ms ease-in;
}
.share-modal.active .share-modal-content {
  transform: scale(1);
  transition: transform 160ms ease-out;
}
.share-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 120ms ease-out;
}
.share-modal-close:hover { background: var(--accent-alt); }
/* 分享图预览：--bg 底 + --fg 字 + --accent 引用线（§7） */
.share-preview {
  position: relative;
  background: var(--bg);
  border: 2px solid var(--fg);
  padding: 32px 24px 32px 30px;
  margin-bottom: 20px;
  text-align: left;
}
.share-preview::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--accent);
}
.share-preview-quote {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fg);
  margin-bottom: 16px;
}
.share-preview-source {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.share-actions { display: flex; gap: 12px; }
.share-actions .share-btn {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out, background-color 120ms ease-out;
}
.share-actions .share-btn-primary { background: var(--accent); color: var(--paper); }
.share-actions .share-btn-secondary { background: var(--paper); color: var(--fg); }
.share-actions .share-btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-btn-hover); }
.share-actions .share-btn-secondary:hover {
  background: var(--accent-alt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}
.share-actions .share-btn:active { transform: translateY(0); box-shadow: var(--shadow-btn-active); }

/* ========== §4.2 Archive 页 ========== */
.archive-month-group { margin-bottom: 48px; }
.archive-month-label {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0 0 24px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--fg);
  display: inline-block;
}
.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.page-desc { font-size: 1rem; color: var(--muted); margin-bottom: 32px; }

/* ========== §6.7 搜索页 ========== */
.search-page .page-title { margin: 0 0 8px 0; }
.search-page .page-desc { font-size: 1rem; color: var(--muted); margin: 0; }
.search-container { margin-bottom: 32px; }
.search-form { display: flex; flex-direction: column; gap: 16px; }
.search-input-wrapper { display: flex; gap: 12px; }
.search-input {
  flex: 1;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 2px solid var(--fg);
  background: var(--paper);
  box-shadow: var(--shadow-btn);
  color: var(--fg);
}
.search-input::placeholder { color: var(--muted); }
.search-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.search-btn {
  padding: 14px 20px;
  background: var(--accent);
  color: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}
.search-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-btn-hover); }
.search-btn:active { transform: translateY(0); box-shadow: var(--shadow-btn-active); }
.category-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.category-btn {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 2px solid var(--fg);
  background: var(--paper);
  color: var(--fg);
  cursor: pointer;
  transition: background-color 120ms ease-out, color 120ms ease-out;
}
.category-btn:hover { background: var(--accent-alt); }
.category-btn.active { background: var(--accent); color: var(--paper); }
.results-container { min-height: 200px; }
.results-header {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--fg);
}
.results-count {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.search-term,
.filter-term {
  margin-left: 8px;
  padding: 2px 8px;
  background: var(--accent-alt);
  border: 2px solid var(--fg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}
.empty-state { text-align: center; padding: 48px 24px; }
.empty-state p { color: var(--muted); margin: 8px 0; }
.empty-hint { font-size: 0.875rem; }

/* ========== 搜索结果 BookCard（§6.4 同 HistoryCard 语言） ========== */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.book-card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  text-decoration: none;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}
.book-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.book-card[hidden] { display: none; }
.book-card .book-cover {
  aspect-ratio: 3 / 4;
  width: 100%;
  height: auto;
  border: none;
  border-bottom: 2px solid var(--fg);
  box-shadow: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  text-align: center;
  background: var(--fg);
}
.book-card .book-cover:hover { transform: none; box-shadow: none; }
.book-card .book-cover-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
  white-space: pre-line;
}
.book-card .book-cover-author {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--accent-alt);
}
.book-card .book-info { padding: 16px; flex: 1; }
.book-card .book-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0 0 4px 0;
  line-height: 1.4;
}
.book-card .book-author {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 8px 0;
}
.book-card .book-category {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--accent-alt);
  border: 2px solid var(--fg);
  color: var(--fg);
  margin-bottom: 8px;
}
.book-card .book-desc {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

/* ========== 404 页 ========== */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: 48px 24px;
}
.not-found-icon {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 24px;
}
.not-found-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  color: var(--fg);
}
.not-found-quote {
  position: relative;
  font-size: 1.125rem;
  color: var(--fg);
  line-height: 1.8;
  margin: 0 0 16px;
  padding: 20px 24px 20px 30px;
  max-width: 440px;
  text-align: left;
  background: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-card);
}
.not-found-quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--accent);
}
.not-found-quote footer {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
}
.not-found-desc {
  font-size: 1rem;
  color: var(--muted);
  margin: 0 0 32px;
  max-width: 360px;
}
.not-found-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--accent);
  color: var(--paper);
  border: 2px solid var(--fg);
  box-shadow: var(--shadow-btn);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}
.not-found-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-btn-hover); }
.not-found-btn:active { transform: translateY(0); box-shadow: var(--shadow-btn-active); }

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--fg); border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ========== §4.3 Responsive ========== */
@media (max-width: 768px) {
  .app-container { padding: 0 16px; }
  .hero-content { grid-template-columns: 1fr; }
  .book-cover-section { padding: 36px; border-right: none; border-bottom: 2px solid var(--fg); }
  .book-cover { width: 160px; height: 230px; }
  .cover-title { font-size: 22px; }
  .book-info-section { padding: 28px; }
  .quote-card { padding: 28px; }
  .quote-text { font-size: 1rem; }
  .quote-actions { position: static; margin-top: 20px; }
  .header { height: auto; min-height: 72px; padding: 12px 0; }
  .header-nav { display: none; }
  .logo-sub { display: none; }
  .mobile-nav { display: block; }
  .history-section { margin-top: 48px; }
  .category-filters { gap: 6px; }
  .category-btn { padding: 6px 12px; font-size: 0.75rem; }
  .search-input-wrapper { flex-direction: column; }
  .search-btn { padding: 12px; }
}
@media (max-width: 480px) {
  .books-grid { grid-template-columns: 1fr; }
}

/* ========== §5.3 减少动效 ========== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}