/**
 * ============================================================
 * 給阿嬤的情書 · 電影記憶館 — 全局样式表
 * ============================================================
 * 
 * 【功能总结】
 * 本文件包含整个单页应用的所有样式定义，涵盖：
 * - 全局CSS变量与设计系统（配色、字体）
 * - 固定导航栏与滚动进度条
 * - 首页Hero视频区域与引言卡片
 * - 展厅I-IV通用模板（展品图+铭牌）
 * - 展厅II图片画廊与灯箱
 * - 展厅V百人千言（筛选器+肖像网格+详情弹窗）
 * - 展厅VI银信局（分屏表单+实时信纸/信封预览）
 * - 我的收藏页面（收藏卡片网格）
 * - 关于页面
 * - 平面图弹窗
 * - 页脚与Kimi水印
 * 
 * 【设计系统】
 * - 主色调：暖米色(#f5f1e8) + 砖红色(#b34a3a) + 深棕色(#2a2118)
 * - 字体：LXGW WenKai TC(正文楷体) + Ma Shan Zheng(标题书法体)
 * - 风格：仿旧纸张质感，怀旧文学氛围
 * 
 * @version 2.0
 * @author 辜涛
 */

/* ============================================================
   1. 全局CSS变量 — 统一的设计令牌系统
   ============================================================ */
:root {
  --color-bg: #f5f1e8;              /* 页面背景：暖米色/奶油色 */
  --color-paper: #fdfaf3;           /* 卡片/信纸背景：更浅的纸色 */
  --color-ink: #1a1410;             /* 墨色：最深的棕黑色 */
  --color-text: #2a2118;            /* 主文字色 */
  --color-text-mute: #8b7d6b;      /* 次要/弱化文字色 */
  --color-vermilion: #b34a3a;       /* 朱红色/强调色 */
  --color-border: rgba(120, 80, 40, .15); /* 边框色：半透明棕色 */
  --font-kai: "LXGW WenKai TC", serif;     /* 楷体：正文用 */
  --font-hand: "Ma Shan Zheng", "Long Cang", "Liu Jian Mao Cao", "LXGW WenKai TC", serif; /* 书法体：标题用 */
}

/* ============================================================
   2. 基础重置
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-kai);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

/* ============================================================
   3. 固定导航栏 — 毛玻璃效果 + 滚动进度条
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(253, 250, 243, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: 48px;
  overflow-x: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

/* 导航链接：默认深棕色，激活/悬停时砖红色 */
.nav-links a {
  font-size: 14px;
  padding: 12px 8px;
  white-space: nowrap;
  position: relative;
  transition: color 0.25s;
  cursor: pointer;
}
.nav-links a:hover { color: var(--color-vermilion); }
.nav-links a.active { color: var(--color-vermilion); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 8px; right: 8px;
  height: 2px;
  background: var(--color-vermilion);
  border-radius: 1px;
}

/* 平面图按钮：描边样式 */
.btn-floorplan {
  flex-shrink: 0;
  margin-left: 16px;
  padding: 6px 16px;
  font-size: 13px;
  font-family: inherit;
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.25s;
}
.btn-floorplan:hover { background: rgba(120, 80, 40, 0.06); }

/* 滚动进度条 */
.progress-bar { height: 2px; background: rgba(120, 80, 40, 0.08); }
.progress-bar-inner {
  height: 100%;
  width: 0%;
  background: var(--color-vermilion);
  transition: width 0.3s;
}

/* ============================================================
   4. 页面路由系统 — SPA页面切换动画
   ============================================================ */
.page { display: none; }
.page.active {
  display: block;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   5. 首页Hero区域 — 全屏视频背景 + 渐变遮罩 + 标题叠加
   ============================================================ */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #3a2e22; /* 视频未加载时的兜底色 */
}
.hero-bg video { width: 100%; height: 100%; object-fit: cover; }

/* 上下暗角渐变：增强文字可读性 */
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    rgba(26,20,16,0.25) 0%,
    rgba(0,0,0,0) 40%,
    rgba(0,0,0,0) 60%,
    rgba(26,20,16,0.45) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
}

.hero-title {
  font-family: var(--font-hand);
  font-size: 42px;
  font-weight: 400;
  color: #fff;
  line-height: 1.1;
  letter-spacing: 2.1px;
  margin-bottom: 16px;
  white-space: nowrap;
}

.hero-subtitle {
  font-size: 14px;
  color: var(--color-vermilion);
  letter-spacing: 4px;
  text-align: center;
}

/* 进入按钮：呼吸灯动画 */
.hero-enter {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  animation: breathe 3s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}

/* ============================================================
   6. 首页引言区域
   ============================================================ */
.intro-section {
  padding: 64px 24px 48px;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}
.intro-text {
  font-size: 15px;
  line-height: 30px;
  letter-spacing: 0.6px;
}

/* ============================================================
   7. 首页导航卡片 — 三张入口卡片
   ============================================================ */
.cards-section {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@media (min-width: 768px) {
  .cards-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.card {
  display: block;
  background: rgba(253, 250, 243, 0.7);
  border-radius: 12px;
  padding: 40px 24px 32px;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
  cursor: pointer;
  border: 1px solid rgba(120, 80, 40, 0.08);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(120, 80, 40, 0.1);
}

.card-icon { width: 48px; height: 48px; margin: 0 auto 20px; }
.card-icon svg { width: 48px; height: 48px; }

.card-title {
  font-family: var(--font-hand);
  font-size: 28px;
  font-weight: 400;
  color: var(--color-ink);
  line-height: 1.3;
  letter-spacing: 1.12px;
  margin-bottom: 8px;
}
.card-subtitle {
  font-size: 14px;
  color: var(--color-text-mute);
  line-height: 1.5;
}

/* ============================================================
   8. 展厅I/III/IV通用模板 — 展品图 + 铭牌 + 导航
   ============================================================ */

/* 展厅页面容器：顶部留出导航栏高度 */
.hall-page {
  padding: 136px 24px 80px;
  max-width: 720px;
  margin: 0 auto;
}

/* 展品图片容器 */
.exhibit-img {
  max-width: 460px;
  aspect-ratio: 3/4;
  border-radius: 4px;
  box-shadow: 0 4px 24px rgba(26, 20, 16, 0.06);
  background: var(--color-paper);
  overflow: hidden;
  margin: 0 auto 64px;
}
.exhibit-img img { width: 100%; height: 100%; object-fit: contain; }
.exhibit-img.square { max-width: 600px; aspect-ratio: 1/1; }

/* 铭牌区域：纸色背景 + 顶部红线 */
.plaque {
  background: var(--color-paper);
  position: relative;
  border-radius: 4px;
  margin-bottom: 64px;
}
.plaque-line { height: 2px; background: var(--color-vermilion); width: 100%; }
.plaque-inner { padding: 48px 56px; }
@media (max-width: 640px) { .plaque-inner { padding: 32px 24px; } }

.plaque-sub {
  font-size: 13px;
  color: var(--color-text-mute);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.plaque-title {
  font-family: var(--font-hand);
  font-size: 50px;
  color: var(--color-ink);
  letter-spacing: 0.04em;
  margin-bottom: 24px;
  line-height: 1.2;
}
@media (max-width: 640px) { .plaque-title { font-size: 36px; } }

.plaque-desc {
  font-size: 16px;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 24px;
}

/* 引用块：左侧红色竖线 */
.plaque-quote {
  border-left: 3px solid var(--color-vermilion);
  padding-left: 24px;
  font-size: 16px;
  line-height: 2.2;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  color: var(--color-text);
}

/* 出处来源：前方红色圆点 */
.plaque-source {
  font-size: 14px;
  color: var(--color-text-mute);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.plaque-source::before {
  content: '';
  display: inline-block;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--color-vermilion);
  margin-top: 8px;
  flex-shrink: 0;
}

/* 展厅底部导航：上一厅/下一厅 */
.hall-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
  border-top: 1px solid var(--color-border);
  padding: 48px 0;
}
.hall-nav a {
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  transition: color 0.25s;
}
.hall-nav a:hover { color: var(--color-vermilion); }
.hall-nav a.disabled { opacity: 0.3; pointer-events: none; }
.hall-nav .counter { font-size: 13px; color: var(--color-text-mute); }

/* ============================================================
   9. 展厅II 紙短情長 — 图片画廊 + 灯箱
   ============================================================ */

/* 4列画廊网格 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto 64px;
  padding: 0 24px;
}
@media (max-width: 900px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .gallery-grid { grid-template-columns: 1fr; } }

.gallery-item {
  aspect-ratio: 3/4;
  border-radius: 3px;
  box-shadow: 0 3px 12px rgba(26, 20, 16, 0.06);
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid var(--color-border);
}
.gallery-item:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(26, 20, 16, 0.12);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; }

/* 灯箱：全屏遮罩 + 居中图片 */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
}
.lightbox.open { display: flex; animation: fadeIn 0.3s; }
.lightbox img {
  max-height: 88vh;
  max-width: 92vw;
  object-fit: contain;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  border-radius: 2px;
}
.lightbox-close {
  position: fixed; top: 20px; right: 24px;
  width: 40px; height: 40px;
  background: rgba(255, 255, 255, 0.08);
  border: none; color: #fff; font-size: 24px;
  cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 1001;
}
.lightbox-prev, .lightbox-next {
  position: fixed; top: 50%; transform: translateY(-50%);
  width: 48px; height: 48px;
  background: rgba(255, 255, 255, 0.08);
  border: none; color: #fff; font-size: 28px;
  cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 1001;
}
.lightbox-prev { left: 24px; }
.lightbox-next { right: 24px; }
.lightbox-counter {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.6); font-size: 14px; z-index: 1001;
}

/* ============================================================
   10. 展厅V 百人千言 — 筛选器 + 肖像墙 + 详情弹窗
   ============================================================ */

/* 页面头部 */
.wall-header {
  text-align: center;
  padding: 136px 24px 40px;
  max-width: 800px;
  margin: 0 auto;
}
.wall-title { font-family: var(--font-hand); font-size: 50px; color: var(--color-ink); margin-bottom: 12px; }
.wall-subtitle { font-size: 14px; color: var(--color-vermilion); letter-spacing: 2px; margin-bottom: 24px; }
.wall-desc { font-size: 15px; line-height: 2; color: var(--color-text); margin-bottom: 8px; }
.wall-disclaimer { font-size: 12px; color: var(--color-text-mute); margin-top: 16px; opacity: 0.8; }

/* 筛选器组：药丸式按钮 */
.filters { max-width: 1200px; margin: 0 auto; padding: 0 24px 24px; }
.filter-group { margin-bottom: 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.filter-label { font-size: 12px; color: var(--color-text-mute); margin-right: 4px; min-width: 48px; }

.filter-btn {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-mute);
  font-family: inherit;
  transition: all 0.2s;
}
.filter-btn.active {
  background: rgba(179, 74, 58, 0.06);
  color: var(--color-vermilion);
  border-color: var(--color-vermilion);
}
.filter-btn:hover { border-color: var(--color-vermilion); }

/* 肖像卡片网格 */
.portrait-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 12px 80px;
}
@media (min-width: 900px) { .portrait-grid { grid-template-columns: repeat(5, 1fr); } }
@media (max-width: 500px) { .portrait-grid { grid-template-columns: repeat(2, 1fr); } }

.portrait-card {
  aspect-ratio: 5/7;
  cursor: pointer;
  overflow: hidden;
  border-radius: 2px;
  transition: transform 0.3s;
  background: var(--color-paper);
}
.portrait-card:hover { transform: scale(1.03); }
.portrait-card-img { height: 70%; overflow: hidden; }
.portrait-card-img img { width: 100%; height: 100%; object-fit: cover; }
.portrait-card-info { height: 30%; padding: 4px 6px; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 1px; }
.portrait-name { font-family: var(--font-hand); font-size: 13px; color: var(--color-ink); }
.portrait-meta { font-size: 8px; color: var(--color-text-mute); }
.portrait-type { font-size: 8px; color: var(--color-vermilion); }

/* ----- 人物详情弹窗（仿原站双栏布局）----- */

/**
 * 【功能说明】
 * 点击肖像后弹出全屏详情弹窗，左侧为肖像卡片（含加入收藏按钮），
 * 右侧为竖排信件内容（仿传统僑批格式），底部有翻页导航。
 * 参考原站的side-by-side布局效果。
 */
.person-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.8);
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.person-modal.open { display: flex; animation: fadeIn 0.3s; }

/* 弹窗内容区：左右双栏 */
.person-modal-content {
  background: var(--color-paper);
  max-width: 900px;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  display: flex;
  max-height: 85vh;
}

@media (max-width: 700px) {
  .person-modal-content { flex-direction: column; max-height: 90vh; overflow-y: auto; }
}

/* 左侧：肖像卡片 */
.person-profile-panel {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
}
@media (max-width: 700px) {
  .person-profile-panel { width: 100%; border-right: none; border-bottom: 1px solid var(--color-border); }
}

.person-profile-img {
  width: 180px;
  height: 252px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 16px;
  box-shadow: 0 4px 16px rgba(26, 20, 16, 0.1);
}
.person-profile-name { font-family: var(--font-hand); font-size: 24px; color: var(--color-ink); margin-bottom: 4px; }
.person-profile-role { font-size: 13px; color: var(--color-text-mute); margin-bottom: 8px; }
.person-profile-meta { font-size: 13px; color: var(--color-vermilion); margin-bottom: 4px; }
.person-profile-to { font-size: 13px; color: var(--color-text); margin-bottom: 16px; }

/* 加入收藏按钮 */
.btn-favorite {
  padding: 8px 24px;
  font-size: 13px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-favorite:hover { border-color: var(--color-vermilion); color: var(--color-vermilion); }
.btn-favorite.favorited {
  background: rgba(179, 74, 58, 0.06);
  color: var(--color-vermilion);
  border-color: var(--color-vermilion);
}

/* 右侧：竖排信件内容 */
.person-letter-panel {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* 信件容器：仿古信纸样式（米黄纸底 + 红褐色边框 + 竖排文字） */
.letter-scroll {
  background: #f5edd4;  /* 仿古纸张色 */
  border: 1px solid #c9a87c;  /* 旧纸边框色 */
  border-radius: 2px;
  padding: 32px 24px 24px;
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  position: relative;
  /* 双线框效果 */
  box-shadow: inset 0 0 0 4px #f5edd4, inset 0 0 0 5px #c9a87c;
}

/* 竖排文字区域：多列竖排，从右向左阅读 */
.letter-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 15px;
  line-height: 2.4;
  letter-spacing: 0.12em;
  color: #2a2118;
  column-gap: 8px;
  min-height: 280px;
  white-space: pre-wrap;
  font-family: var(--font-kai);
  /* 列间分隔线 */
  column-rule: 1px solid rgba(201, 168, 124, 0.3);
}

/* 银信印章：右下角红色方形印章 */
.letter-stamp {
  width: 36px;
  height: 36px;
  background: var(--color-vermilion);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: var(--font-hand);
  border-radius: 2px;
  margin-top: 12px;
  align-self: flex-end;
  /* 印章微倾斜效果 */
  transform: rotate(-3deg);
  opacity: 0.9;
}

/* 翻页导航 */
.letter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.letter-nav button {
  padding: 6px 16px;
  font-size: 13px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s;
}
.letter-nav button:hover { border-color: var(--color-vermilion); color: var(--color-vermilion); }
.letter-nav button:disabled { opacity: 0.3; cursor: default; }
.letter-nav button:disabled:hover { border-color: var(--color-border); color: var(--color-text); }
.letter-nav-counter { font-size: 13px; color: var(--color-text-mute); }

.letter-nav-back {
  display: block;
  text-align: center;
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-text-mute);
  cursor: pointer;
}
.letter-nav-back:hover { color: var(--color-vermilion); }

.person-modal-close {
  position: absolute;
  top: 12px; right: 12px;
  width: 36px; height: 36px;
  background: rgba(0, 0, 0, 0.5);
  border: none; color: #fff; font-size: 20px;
  cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 10;
}

/* ============================================================
   11. 展厅VI 銀信局 — 左表单 + 右实时预览
   ============================================================ */

/**
 * 【功能说明】
 * 银信局采用分屏布局：
 * - 左侧为表单区（寄信人、收信人、心意、附件、日期、配图选择）
 * - 右侧为实时预览区（信纸预览 + 信封预览），随表单输入动态更新
 * - 参考原站 https://qbgogtgc47664.ok.kimi.link/#/hall/6 的样式
 */
.hall6-header { text-align: center; padding: 136px 24px 40px; }
.hall6-sub { font-size: 14px; color: var(--color-text-mute); letter-spacing: 0.08em; margin-bottom: 16px; }
.hall6-title { font-family: var(--font-hand); font-size: 40px; color: var(--color-ink); margin-bottom: 12px; letter-spacing: 0.04em; }
.hall6-desc { font-size: 16px; color: var(--color-text); }

/* 分屏容器 */
.hall6-split {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 1023px) {
  .hall6-split { grid-template-columns: 1fr; }
}

/* 表单区域 */
.letter-form { width: 100%; }
.form-group { margin-bottom: 28px; }
.form-label { font-size: 14px; color: var(--color-text); margin-bottom: 8px; display: block; letter-spacing: 0.02em; }
/* 表单提示文字（如"至多選五句，已選 0/5"） */
.form-hint { font-size: 12px; color: var(--color-text-mute); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
/* 日期三列布局 */
.form-row-3col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.form-input, .form-select {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}
.form-input:focus, .form-select:focus { border-color: var(--color-vermilion); }

/* 切换按钮组（心意/附件） */
.toggle-group { display: flex; flex-wrap: wrap; gap: 8px; }
.toggle-btn {
  padding: 8px 18px;
  font-size: 14px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-mute);
  font-family: inherit;
  transition: all 0.2s;
}
.toggle-btn.active {
  background: rgba(179, 74, 58, 0.06);
  color: var(--color-vermilion);
  border-color: var(--color-vermilion);
}
.toggle-btn:hover { border-color: var(--color-vermilion); }
/* 附件按钮略小字号 */
.toggle-group-sm .toggle-btn { padding: 6px 14px; font-size: 13px; }

/* ----- 心意类别标签页（原站交互样式） ----- */
.mood-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.mood-tab {
  padding: 8px 18px;
  font-size: 14px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-mute);
  font-family: inherit;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.mood-tab.active {
  background: rgba(179, 74, 58, 0.06);
  color: var(--color-vermilion);
  border-color: var(--color-vermilion);
}
.mood-tab:hover { border-color: var(--color-vermilion); }
/* 复选框图标（选中时显示√） */
.mood-tab-check {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 1.5px solid currentColor;
  border-radius: 2px;
  position: relative;
}
.mood-tab.active .mood-tab-check::after {
  content: '\2713';
  position: absolute;
  top: -2px;
  left: 1px;
  font-size: 11px;
  line-height: 1;
}

/* 心意句子列表 — 点击标签后展开的复选框列表 */
.mood-sentences {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mood-sentence {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-paper);
  cursor: pointer;
  transition: all 0.2s;
}
.mood-sentence:hover { border-color: var(--color-vermilion); }
.mood-sentence.selected {
  border-color: var(--color-vermilion);
  background: rgba(179, 74, 58, 0.03);
}
/* 句子复选框 */
.sentence-checkbox {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--color-border);
  border-radius: 2px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.mood-sentence.selected .sentence-checkbox {
  border-color: var(--color-vermilion);
  background: var(--color-vermilion);
}
.mood-sentence.selected .sentence-checkbox::after {
  content: '\2713';
  color: #fff;
  font-size: 12px;
  line-height: 1;
}
/* 句子文字 */
.sentence-text {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

/* 配图选择网格 — 4列网格，每项含缩略图和标签 */
.illust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.illust-item {
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
  border: 2px solid transparent;
  padding: 6px;
  background: var(--color-paper);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.illust-item.active {
  border-color: var(--color-vermilion);
  background: rgba(179, 74, 58, 0.06);
}
.illust-item img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: contain;
  border-radius: 2px;
}
.illust-item span {
  font-size: 12px;
  color: var(--color-text-mute);
  margin-top: 4px;
}
.illust-item.active span {
  color: var(--color-vermilion);
}

/* 移动端预览按钮 — 仅在移动端显示，桌面端隐藏 */
.preview-btn-mobile {
  display: none;
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  font-size: 15px;
  font-family: inherit;
  background: rgba(179, 74, 58, 0.06);
  border: 1px solid var(--color-vermilion);
  color: var(--color-vermilion);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.preview-btn-mobile:hover { background: rgba(179, 74, 58, 0.12); }
@media (max-width: 1023px) {
  .preview-btn-mobile { display: block; }
}

/* 右侧预览面板 */
.preview-panel {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
@media (max-width: 1023px) {
  .preview-panel { position: static; }
}

/* 默认提示语：未填写时显示的引导文字 */
.preview-prompt {
  text-align: center;
  padding: 48px 16px;
  color: var(--color-text-mute);
  font-size: 15px;
  line-height: 1.8;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

/* ----- 信纸预览区 ----- */
.letter-preview-box {
  border: none;
  padding: 0;
}
.letter-preview-title {
  font-family: var(--font-kai);
  font-size: 14px;
  color: var(--color-text-mute);
  margin-bottom: 12px;
  letter-spacing: 0.08em;
}

/**
 * 信纸主体样式 — 参考原站
 * 米色古纸底色 + 多色渐变模拟旧纸质感
 * 红色内边框(3px) + 毛边裁剪效果
 */
.letter-paper {
  position: relative;
  background: linear-gradient(135deg, #e8dcc4, #d4c4a0);
  padding: 20px;
  border-radius: 2px;
  overflow: hidden;
}
/* 信纸内层 — 模拟古纸纹理 + 内阴影 */
.letter-paper-inner {
  position: relative;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(245,237,212,0.6) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(230,218,192,0.4) 0%, transparent 60%),
    linear-gradient(180deg, #f0e6d0, #e4d8be);
  min-height: 320px;
  padding: 36px 28px;
  box-shadow: inset 0 0 30px rgba(120, 80, 40, 0.1);
  border-radius: 1px;
}
/* 红色内边框 — 传统僑批的红框格式 */
.letter-paper-inner::before {
  content: '';
  position: absolute;
  inset: 18px 16px;
  border: 3px solid var(--color-vermilion);
  pointer-events: none;
}

/* 信纸文字 — 横排书写，手写体 */
.letter-text {
  font-family: var(--font-hand);
  font-size: 18px;
  line-height: 2.2;
  letter-spacing: 0.1em;
  color: #1a1a1a;
  position: relative;
  z-index: 1;
}
.letter-text .letter-greeting {
  display: block;
  margin-bottom: 16px;
}
.letter-text .letter-body {
  display: block;
  margin-bottom: 16px;
  text-indent: 2em;
}
.letter-text .letter-sign {
  display: block;
  text-align: right;
  margin-top: 20px;
}
.letter-text .letter-date {
  display: block;
  text-align: right;
  font-size: 14px;
  margin-top: 4px;
  color: #4a4a4a;
}

/* 信纸底部装饰配图 — 灰度化处理 */
.letter-paper-illust {
  position: absolute;
  bottom: 4%;
  left: 4%;
  width: 55%;
  opacity: 0.25;
  transform: rotate(-4deg);
  filter: grayscale(100%);
  mix-blend-mode: multiply;
  pointer-events: none;
}

/* ----- 信封预览区 ----- */
.envelope-preview-box {
  border: none;
  padding: 0;
}
.envelope-preview-title {
  font-family: var(--font-kai);
  font-size: 14px;
  color: var(--color-text-mute);
  margin-bottom: 12px;
  letter-spacing: 0.08em;
}

/**
 * 信封样式 — 参考原站复杂的三栏设计
 * 左侧：收信人信息（米色底 + 竖排 + 印章）
 * 中间：红色「僑批」大字
 * 右侧：寄信人信息（米色底 + 竖排 + 装饰）
 */
.envelope-display {
  position: relative;
  display: flex;
  aspect-ratio: 9/14;
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.25);
  background: linear-gradient(160deg, #d4aa72 0%, #c49a62 60%, #ba9258 100%);
}

/* 信封左栏 — 收信人 + 印章 + 银信标签 */
.envelope-left {
  width: 22%;
  background: linear-gradient(180deg, #f0e6d0, #e4d8be);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 6px;
  position: relative;
}
/* 左上角「银信」标签 — 金属质感 */
.envelope-badge {
  display: inline-block;
  padding: 2px 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  border: 1.5px solid #4a4a4a;
  background: linear-gradient(135deg, #d4d2cc, #a8a6a0, #c2c0ba);
  color: #2a2a2a;
  border-radius: 2px;
  margin-bottom: 8px;
}
/* 收信人 — 竖排大字 */
.envelope-receiver {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 28px;
  letter-spacing: 8px;
  color: #1a1410;
  font-family: var(--font-hand);
  flex: 1;
  display: flex;
  align-items: center;
}
/* 收信人称谓 */
.envelope-receiver-sub {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 16px;
  letter-spacing: 4px;
  color: #1a1410;
  font-family: var(--font-kai);
  margin-top: 4px;
}
/* 左下角圆形印章 */
.envelope-seal {
  width: 44px;
  height: 44px;
  border: 2px solid #c03525;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-7deg);
  margin-top: 8px;
  flex-shrink: 0;
}
.envelope-seal-inner {
  width: 34px;
  height: 34px;
  border: 1px solid #c03525;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  color: #c03525;
  font-family: var(--font-hand);
}

/* 信封中栏 — 红色背景 + 「僑批」大字 */
.envelope-center {
  width: 50%;
  background: linear-gradient(170deg, #c03525, #9e2515);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}
/* 大字「僑批」 */
.envelope-qiaopi {
  font-family: var(--font-hand);
  font-size: 56px;
  font-weight: 900;
  color: #1a1a1a;
  writing-mode: vertical-rl;
  letter-spacing: 8px;
  -webkit-text-stroke: 1px #1a1a1a;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

/* 信封右栏 — 寄信人 + 装饰文字 */
.envelope-right {
  width: 28%;
  background: linear-gradient(180deg, #f0e6d0, #e4d8be);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 6px;
  position: relative;
}
/* 右上角斜条纹装饰 */
.envelope-right::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 40px;
  height: 40px;
  background: repeating-linear-gradient(
    -48deg,
    transparent,
    transparent 3px,
    rgba(120,80,40,0.1) 3px,
    rgba(120,80,40,0.1) 5px
  );
}
/* 右侧竖排装饰文字 */
.envelope-deco-text {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 22px;
  letter-spacing: 4px;
  color: #1a1410;
  font-family: var(--font-hand);
  padding: 6px 2px;
  border: 1.5px solid rgba(120,80,40,0.2);
  border-radius: 6px;
  margin-bottom: 8px;
}
/* 右侧寄信人信息 */
.envelope-sender {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 20px;
  letter-spacing: 2px;
  color: #1a1410;
  font-family: var(--font-hand);
  flex: 1;
  display: flex;
  align-items: center;
}

/* ----- 操作按钮 ----- */
.form-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 8px;
}
.btn-action {
  padding: 10px 24px;
  font-size: 14px;
  font-family: inherit;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
/* 下载信纸按钮 — 硃红实心 */
.btn-download-letter {
  background: var(--color-vermilion);
  color: #fff;
  border: 1px solid var(--color-vermilion);
}
.btn-download-letter:hover { opacity: 0.9; }
.btn-download-letter:disabled {
  background: #d4cfc6;
  border-color: #d4cfc6;
  color: #a8a29e;
  cursor: not-allowed;
}
/* 下载信封按钮 — 硃红描边 */
.btn-download-envelope {
  background: transparent;
  color: var(--color-vermilion);
  border: 1px solid var(--color-vermilion);
}
.btn-download-envelope:hover { background: rgba(179,74,58,0.06); }
.btn-download-envelope:disabled {
  color: #a8a29e;
  border-color: #d4cfc6;
  cursor: not-allowed;
}
/* 分享按钮 — 灰色描边（始终可用） */
.btn-share {
  background: transparent;
  color: var(--color-text-mute);
  border: 1px solid var(--color-border);
}
.btn-share:hover { border-color: var(--color-text); color: var(--color-text); }

/* ============================================================
   12. 我的收藏页面 — 收藏卡片网格
   ============================================================ */

/**
 * 【功能说明】
 * 收藏页面展示用户从百人千言展厅收藏的人物卡片。
 * 使用localStorage持久化存储。空状态显示引导文案。
 */
.archive-page {
  padding: 136px 24px 80px;
  max-width: 1200px;
  margin: 0 auto;
}
.archive-title {
  font-family: var(--font-hand);
  font-size: 48px;
  color: var(--color-ink);
  text-align: center;
  margin-bottom: 8px;
}
.archive-sub {
  font-size: 14px;
  color: var(--color-text-mute);
  text-align: center;
  margin-bottom: 48px;
}

/* 收藏卡片网格 */
.favorites-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (min-width: 900px) { .favorites-grid { grid-template-columns: repeat(5, 1fr); } }
@media (max-width: 500px) { .favorites-grid { grid-template-columns: repeat(2, 1fr); } }

.fav-card {
  background: var(--color-paper);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s;
  border: 1px solid var(--color-border);
}
.fav-card:hover { transform: scale(1.03); }
.fav-card-img { aspect-ratio: 5/7; overflow: hidden; }
.fav-card-img img { width: 100%; height: 100%; object-fit: cover; }
.fav-card-info { padding: 8px; text-align: center; }
.fav-card-name { font-family: var(--font-hand); font-size: 14px; color: var(--color-ink); }
.fav-card-meta { font-size: 9px; color: var(--color-text-mute); margin-top: 2px; }
.fav-card-remove {
  display: block;
  margin: 4px auto 8px;
  padding: 2px 12px;
  font-size: 11px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: transparent;
  color: var(--color-text-mute);
  cursor: pointer;
}
.fav-card-remove:hover { border-color: var(--color-vermilion); color: var(--color-vermilion); }

/* 空状态 */
.archive-empty {
  text-align: center;
  padding: 80px 0;
}
.archive-empty-msg { font-size: 14px; color: var(--color-text-mute); margin-bottom: 32px; }

.btn-back {
  padding: 10px 28px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-back:hover { border-color: var(--color-vermilion); color: var(--color-vermilion); }

/* ============================================================
   13. 关于页面
   ============================================================ */
.about-page {
  min-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 24px;
  text-align: center;
}
.about-line { height: 1px; background: var(--color-border); width: 40px; margin-bottom: 64px; }
.about-label { font-size: 13px; color: var(--color-text-mute); letter-spacing: 0.08em; margin-bottom: 32px; }
.about-body { max-width: 560px; font-size: 14px; line-height: 2; color: var(--color-text); }

/* ============================================================
   14. 平面图弹窗 — SVG节点交互
   ============================================================ */
.floorplan-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(26, 20, 16, 0.6);
  align-items: center;
  justify-content: center;
}
.floorplan-overlay.open { display: flex; animation: fadeIn 0.3s; }

.floorplan-modal {
  background: var(--color-paper);
  max-width: 600px;
  width: 90%;
  border-radius: 8px;
  padding: 40px;
  border: 1px solid var(--color-border);
  position: relative;
}
.floorplan-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--color-text-mute);
}
.floorplan-title {
  font-family: var(--font-hand);
  font-size: 28px;
  text-align: center;
  margin-bottom: 32px;
  color: var(--color-ink);
}

.floorplan-svg { width: 100%; }
.floorplan-svg .node-circle { transition: all 0.2s; cursor: pointer; }
.floorplan-svg .node-circle:hover { fill: rgba(179, 74, 58, 0.1); }

/* ============================================================
   15. 页脚
   ============================================================ */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
}
.footer-line1 { font-size: 13px; color: var(--color-text-mute); letter-spacing: 0.26px; margin-bottom: 6px; }
.footer-line2 { font-size: 12px; color: var(--color-text-mute); opacity: 0.7; }