/* ============================================================
   屿川渡 yuchuandu.com — 全站共享样式
   吉卜力/千与千寻手绘感 · 移动端优先（375px基准）
   ============================================================ */

/* ---------- 设计 Token ---------- */
:root {
  /* 青瓷绿雾感（v5 定稿：浅青瓷底 + 深青绿点缀 + 米白卡片，清新透亮） */
  --color-primary: #1a4d45;
  --color-primary-deep: #143c36;
  --color-primary-darker: #1a4d45; /* Footer / 深色 banner 用深青绿，非近黑 */
  --color-primary-soft: #5e8a7c;  /* 雾山中间调 */
  --color-primary-fog: #a8c3b4;   /* 淡雾远层 */
  --color-primary-light: #dce8e0;
  --color-primary-mist: #e6eee8;

  /* 暖琥珀（仅橙子/灯火/小点缀，禁止大面积使用） */
  --color-accent: #e8a24a;
  --color-accent-deep: #c07f2e;
  --color-accent-light: #f7ecd7;
  --color-accent-soft: #f0dfc0;

  /* 纸张底 */
  --color-bg: #eef2ec;
  --color-card: #fdfbf3;
  --color-card-soft: #e8ede4;

  /* 文字 */
  --color-ink: #21423a;
  --color-ink-secondary: #5f6f68;
  --color-ink-muted: #96a49c;

  /* 语义 */
  --color-line: #d7ded4;
  --color-success: #3E7C5B;
  --color-warning: #b07a2e;
  --color-danger: #B54A3A;

  /* 辅助信息色（偏青绿的沉稳色调，避免冷蓝/紫色系） */
  --color-info: #2f6b5e;
  --color-info-light: #e0ebe4;
  --color-success-light: #e7f0ea;
  --color-wechat: #2AAE67;

  /* 装饰插画色（渐变底图 / 奖牌 / 插画点缀） */
  --color-teal-deep: #17514D;
  --color-teal-dark: #0B2B29;
  --color-teal-bright: #2E7A74;
  --color-sand: #E8A24A;
  --color-sand-deep: #C98A4B;
  --color-earth: #8A5A1E;
  --color-earth-dark: #5B3A14;
  --color-sage: #8FA398;
  --color-sage-deep: #5B7A6E;
  --color-flax: #D5C9A8;
  --color-flax-deep: #A89A76;
  --color-fog: #D9E8E4;
  --color-lantern: #F6D88A;
  --color-aqua: #9CCDC5;
  --color-ink-night: #3E4A46;

  /* 奖牌金 / 银 / 铜 */
  --medal-gold: #F2C14E;
  --medal-gold-mid: #D9982B;
  --medal-gold-deep: #C0841F;
  --medal-silver: #E5E9EC;
  --medal-silver-mid: #B9C2C9;
  --medal-silver-deep: #9AA5AD;
  --medal-bronze: #E3A66B;
  --medal-bronze-mid: #C07A45;
  --medal-bronze-deep: #A46134;

  /* 圆角 / 阴影 */
  --radius-sm: 8px;
  --radius: 16px;   /* 按钮 */
  --radius-lg: 20px; /* 卡片 */
  --radius-xl: 24px; /* 大卡 */
  --shadow-sm: 0 2px 12px rgba(26, 77, 69, 0.08);
  --shadow: 0 4px 16px rgba(26, 77, 69, 0.10);
  --shadow-lg: 0 12px 28px rgba(26, 77, 69, 0.14);

  /* 字体 */
  --font-title: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;

  /* 布局 */
  --header-h: 64px;
  --tabbar-h: 60px;
  --maxw: 1160px;

  /* 缓动（无弹跳） */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% -4%, var(--color-primary-light) 0%, transparent 42%),
    radial-gradient(circle at 92% 6%, var(--color-accent-light) 0%, transparent 38%);
  -webkit-font-smoothing: antialiased;
  padding-top: var(--header-h);
  min-height: 100vh;
}
h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-ink);
  margin: 0 0 0.4em;
}
h1 { font-size: 28px; }
h2 { font-size: 22px; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }
p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-deep); }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 15px; }
svg { display: inline-block; vertical-align: middle; }
::selection { background: var(--color-primary-light); }

/* ---------- 布局容器 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
.section { padding: 44px 0; }
.section--tight { padding: 28px 0; }
.section-head { margin-bottom: 22px; }
.section-head .kicker {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; letter-spacing: 2px; color: var(--color-accent-deep);
  margin-bottom: 8px; text-transform: uppercase;
}
.section-head .kicker::before {
  content: ""; width: 18px; height: 2px; background: var(--color-accent);
  border-radius: 2px; display: inline-block;
}
.section-head h2 { margin: 0 0 6px; }
.section-head p { color: var(--color-ink-secondary); font-size: 14px; margin: 0; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(238, 242, 236, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}
.site-header .container {
  height: 100%; display: flex; align-items: center; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--color-primary-deep); }
.brand .brand-mark { width: 36px; height: 36px; flex: none; }
.brand .brand-name { font-family: var(--font-title); font-size: 19px; font-weight: 700; line-height: 1; }
.brand .brand-sub { display: block; font-size: 10px; letter-spacing: 2px; color: var(--color-accent-deep); margin-top: 2px; }

.nav-desktop { display: none; margin-left: auto; align-items: center; gap: 4px; }
.nav-desktop a {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 14px; color: var(--color-ink); font-weight: 500;
}
.nav-desktop a:hover { background: var(--color-primary-light); color: var(--color-primary-deep); }
.nav-desktop a.active { color: var(--color-primary-deep); background: var(--color-primary-light); }
.nav-desktop a .nav-ico { width: 17px; height: 17px; flex: none; }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav-desktop .header-actions { margin-left: 0; }
.btn-ai-entry {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 999px;
  background: var(--color-primary);
  color: #fff; font-size: 13px; font-weight: 600; border: none;
}
.btn-ai-entry:hover { color: #fff; opacity: 0.92; }
.btn-ai-entry .nav-ico { width: 15px; height: 15px; }
.btn-login {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 13px; border-radius: var(--radius-sm);
  border: 1px solid var(--color-line); background: var(--color-card);
  color: var(--color-ink); font-size: 13px; font-weight: 500;
}
.btn-login:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-login .nav-ico { width: 15px; height: 15px; }

.header-search {
  display: none; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--color-line); background: var(--color-card);
  color: var(--color-ink-muted); font-size: 13px;
}
.header-search svg { width: 15px; height: 15px; flex: none; }
.header-search input { border: none; background: none; outline: none; width: 110px; font-size: 13px; color: var(--color-ink); }
.header-search input::placeholder { color: var(--color-ink-muted); }
@media (min-width: 960px) { .header-search { display: flex; } }

.hamburger {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border: none; background: none; color: var(--color-ink);
}
.hamburger svg { width: 24px; height: 24px; }

/* 移动端全屏导航 */
.mobile-nav {
  position: fixed; inset: 0; z-index: 200;
  background: var(--color-bg); padding: 24px 20px 40px;
  transform: translateX(100%); transition: transform 0.2s var(--ease);
  display: flex; flex-direction: column;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav .mn-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.mobile-nav .mn-close { width: 40px; height: 40px; border: none; background: none; color: var(--color-ink); }
.mobile-nav .mn-close svg { width: 26px; height: 26px; }
.mobile-nav nav a {
  display: flex; align-items: center; gap: 12px;
  padding: 15px 8px; font-size: 17px; font-weight: 500;
  color: var(--color-ink); border-bottom: 1px solid var(--color-line);
}
.mobile-nav nav a.active { color: var(--color-primary-deep); }
.mobile-nav nav a .nav-ico { width: 22px; height: 22px; flex: none; color: var(--color-accent); }
.mobile-nav .mn-footer { margin-top: auto; padding-top: 20px; font-size: 13px; color: var(--color-ink-muted); }

/* ---------- 移动端底部 Tab 栏 ---------- */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  height: var(--tabbar-h);
  display: flex; align-items: stretch;
  background: rgba(253, 251, 243, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-line);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.tabbar a {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; font-size: 11px; color: var(--color-ink-secondary);
}
.tabbar a .tab-ico { width: 22px; height: 22px; }
.tabbar a.active { color: var(--color-primary-deep); font-weight: 600; }
body { padding-bottom: var(--tabbar-h); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; line-height: 1.4; transition: all 0.2s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn .btn-ico { width: 18px; height: 18px; }
.btn-primary {
  background: var(--color-primary);
  color: #fff; box-shadow: var(--shadow-sm);
}
.btn-primary:hover { color: #fff; box-shadow: var(--shadow); opacity: 0.94; }
.btn-accent {
  background: var(--color-accent);
  color: #fff; box-shadow: var(--shadow-sm);
}
.btn-accent:hover { color: #fff; opacity: 0.94; }
.btn-outline {
  background: var(--color-card); color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary-light); }
.btn-ghost { background: transparent; color: var(--color-ink); border-color: var(--color-line); }
.btn-ghost:hover { border-color: var(--color-ink-secondary); }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-sm { padding: 7px 16px; font-size: 13px; border-radius: 999px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.5; pointer-events: none; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: 20px; transition: box-shadow 0.2s var(--ease);
}
.card:hover { box-shadow: var(--shadow); }
.card--link { display: block; color: inherit; }
.card--link:hover { color: inherit; }

/* ---------- 标签 / 徽章 ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 500; line-height: 1.5;
}
.tag .tag-ico { width: 13px; height: 13px; }
.tag-primary { background: var(--color-primary-light); color: var(--color-primary-deep); }
.tag-accent { background: var(--color-accent-light); color: var(--color-accent-deep); }
.tag-success { background: var(--color-success-light); color: var(--color-success); }
.tag-info { background: var(--color-info-light); color: var(--color-info); }
.tag-neutral { background: var(--color-card-soft); color: var(--color-ink-secondary); }

.badge-pilot {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 14px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  border: 1px solid var(--color-line);
  font-size: 13px; font-weight: 600; color: var(--color-primary-deep);
}
.badge-pilot .badge-ico { width: 18px; height: 18px; color: var(--color-accent-deep); }

/* ---------- 表单 ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--color-ink); }
.field label .req { color: var(--color-danger); }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 14px; border-radius: var(--radius);
  border: 1px solid var(--color-line); background: var(--color-card);
  color: var(--color-ink); transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.field input::placeholder, .field textarea::placeholder { color: var(--color-ink-muted); }
.field textarea { min-height: 100px; resize: vertical; }
.field .hint { font-size: 12px; color: var(--color-ink-muted); margin-top: 4px; }
.field .error-msg { display: none; font-size: 12px; color: var(--color-danger); margin-top: 4px; }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--color-danger); }
.field.invalid .error-msg { display: block; }
.form-row { display: grid; gap: 16px; }

/* 验证码输入 */
.code-row { display: flex; gap: 10px; }
.code-row input { flex: 1; }
.code-row .btn { flex: none; }

/* ---------- 榜单奖牌 ---------- */
.medal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%; flex: none;
  font-family: var(--font-title); font-weight: 700; font-size: 16px; color: #fff;
  position: relative; box-shadow: inset 0 -2px 0 rgba(0,0,0,0.12), var(--shadow-sm);
}
.medal--gold { background: linear-gradient(145deg, var(--medal-gold) 0%, var(--medal-gold-mid) 60%, var(--medal-gold-deep) 100%); }
.medal--silver { background: linear-gradient(145deg, var(--medal-silver) 0%, var(--medal-silver-mid) 60%, var(--medal-silver-deep) 100%); }
.medal--bronze { background: linear-gradient(145deg, var(--medal-bronze) 0%, var(--medal-bronze-mid) 60%, var(--medal-bronze-deep) 100%); }
.rank-item { display: flex; align-items: center; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--color-line); }
.rank-item:last-child { border-bottom: none; }
.rank-item .rank-no { width: 34px; text-align: center; flex: none; }
.rank-item .rank-no .num { font-family: var(--font-title); font-size: 18px; font-weight: 700; color: var(--color-ink-muted); }
.rank-item .rank-body { flex: 1; min-width: 0; }
.rank-item .rank-title { font-weight: 600; font-size: 15px; }
.rank-item .rank-sub { font-size: 12px; color: var(--color-ink-secondary); }
.rank-item .rank-score { font-size: 13px; font-weight: 600; color: var(--color-accent-deep); flex: none; }

/* ---------- Tab 栏 ---------- */
.tabs { display: flex; gap: 6px; overflow-x: auto; padding: 4px; background: var(--color-card-soft); border-radius: var(--radius); }
.tabs .tab-btn {
  flex: none; padding: 8px 16px; border: none; background: none; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; color: var(--color-ink-secondary);
}
.tabs .tab-btn.active { background: var(--color-card); color: var(--color-primary-deep); box-shadow: var(--shadow-sm); font-weight: 600; }
.tab-panel { display: none; padding-top: 20px; }
.tab-panel.active { display: block; }

/* ---------- 手风琴（FAQ） ---------- */
.accordion-item { border: 1px solid var(--color-line); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; background: var(--color-card); }
.accordion-head {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 18px; border: none; background: none; text-align: left;
  font-size: 15px; font-weight: 600; color: var(--color-ink);
}
.accordion-head .acc-ico { width: 18px; height: 18px; flex: none; color: var(--color-accent); transition: transform 0.2s var(--ease); }
.accordion-item.open .acc-ico { transform: rotate(180deg); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height 0.3s var(--ease); }
.accordion-item.open .accordion-body { max-height: 600px; }
.accordion-body .acc-inner { padding: 0 18px 18px; color: var(--color-ink-secondary); font-size: 14px; }

/* ---------- 面包屑 ---------- */
.crumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--color-ink-muted); padding: 14px 0 0; }
.crumbs a { color: var(--color-ink-secondary); }
.crumbs a:hover { color: var(--color-primary); }
.crumbs .sep { color: var(--color-ink-muted); }

/* ---------- AI渡 悬浮球 ---------- */
.ai-ball {
  position: fixed; right: 18px; bottom: calc(var(--tabbar-h) + 18px); z-index: 90;
  width: 56px; height: 56px; border-radius: 50%; border: none;
  background: var(--color-primary);
  box-shadow: var(--shadow-lg); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.2s var(--ease);
}
.ai-ball:hover { transform: scale(1.05); }
.ai-ball svg { width: 34px; height: 34px; }

.ai-panel {
  position: fixed; right: 14px; bottom: calc(var(--tabbar-h) + 86px); z-index: 95;
  width: min(340px, calc(100vw - 28px)); height: 460px; max-height: calc(100vh - 180px);
  background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); display: flex; flex-direction: column; overflow: hidden;
  transform: translateY(16px); opacity: 0; pointer-events: none; transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.ai-panel.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.ai-panel .ap-head { display: flex; align-items: center; gap: 10px; padding: 14px 16px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-deep)); color: #fff; }
.ai-panel .ap-head .ap-avatar { width: 38px; height: 38px; flex: none; }
.ai-panel .ap-head .ap-name { font-weight: 700; font-size: 15px; }
.ai-panel .ap-head .ap-status { font-size: 11px; opacity: 0.85; }
.ai-panel .ap-close { margin-left: auto; border: none; background: none; color: #fff; width: 32px; height: 32px; }
.ai-panel .ap-close svg { width: 20px; height: 20px; }
.ai-panel .ap-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; background: var(--color-bg); }
.ai-panel .ap-msg { max-width: 82%; padding: 10px 14px; border-radius: var(--radius); font-size: 14px; line-height: 1.6; }
.ai-panel .ap-msg.bot { align-self: flex-start; background: var(--color-card); border: 1px solid var(--color-line); border-bottom-left-radius: 4px; }
.ai-panel .ap-msg.user { align-self: flex-end; background: var(--color-primary-light); color: var(--color-primary-deep); border-bottom-right-radius: 4px; }
.ai-panel .ap-quick { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 16px 10px; background: var(--color-bg); }
.ai-panel .ap-quick button { border: 1px solid var(--color-line); background: var(--color-card); border-radius: 999px; padding: 5px 12px; font-size: 12px; color: var(--color-ink-secondary); }
.ai-panel .ap-input { display: flex; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--color-line); background: var(--color-card); }
.ai-panel .ap-input input { flex: 1; border: 1px solid var(--color-line); border-radius: 999px; padding: 9px 14px; font-size: 14px; }
.ai-panel .ap-input input:focus { outline: none; border-color: var(--color-primary); }
.ai-panel .ap-input button { width: 42px; height: 42px; border-radius: 50%; border: none; background: var(--color-primary); color: #fff; display: flex; align-items: center; justify-content: center; flex: none; }
.ai-panel .ap-input button svg { width: 20px; height: 20px; }

/* ---------- 提示 Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + 24px); z-index: 300;
  transform: translateX(-50%); background: var(--color-ink); color: #fff;
  padding: 11px 20px; border-radius: 999px; font-size: 14px; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  max-width: calc(100vw - 40px); text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-6px); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--color-primary-darker); color: rgba(255,255,255,0.82); padding: 44px 0 28px; margin-top: 20px; }
.site-footer a { color: rgba(255,255,255,0.82); }
.site-footer a:hover { color: #fff; }
.site-footer .foot-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; color: #fff; }
.site-footer .foot-brand .brand-name { font-family: var(--font-title); font-size: 18px; font-weight: 700; }
.site-footer .foot-brand .foot-tagline { display: block; font-family: var(--font-title); font-size: 12px; letter-spacing: 3px; color: rgba(255,255,255,0.7); margin-top: 3px; }
.site-footer .foot-desc { font-size: 13px; line-height: 1.8; color: rgba(255,255,255,0.65); max-width: 480px; }
.site-footer .foot-cols { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin: 26px 0; }
.site-footer .foot-col h4 { color: #fff; font-size: 14px; margin-bottom: 12px; }
.site-footer .foot-col a { display: block; font-size: 13px; padding: 5px 0; color: rgba(255,255,255,0.7); }
.site-footer .foot-bottom { border-top: 1px solid rgba(255,255,255,0.14); padding-top: 18px; font-size: 12px; color: rgba(255,255,255,0.55); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; }
.site-footer .foot-bottom .foot-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.site-footer .foot-badge { border: 1px solid rgba(255,255,255,0.25); border-radius: 6px; padding: 4px 10px; font-size: 11px; color: rgba(255,255,255,0.75); }

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-ink-secondary); }
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; } .mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; }
.flex { display: flex; } .flex-wrap { flex-wrap: wrap; } .items-center { align-items: center; } .justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; } .gap-2 { gap: 16px; } .gap-3 { gap: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--color-line); border: none; margin: 24px 0; }

/* ---------- 照片容器（真实照片 + 渐变回退） ---------- */
.photo { position: relative; overflow: hidden; background-color: var(--color-card-soft); }
.photo > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; z-index: 1; }

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .form-row { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 34px; }
  h2 { font-size: 26px; }
}
@media (min-width: 960px) {
  .nav-desktop { display: flex; }
  .hamburger { display: none; }
  .header-actions.mobile-only { display: none; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .section { padding: 64px 0; }
  h1 { font-size: 40px; }
  .site-footer .foot-cols { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 959px) {
  .header-actions.desktop-only { display: none; }
}

/* 桌面端隐藏底部tab栏 */
@media (min-width: 960px) {
  .tabbar { display: none; }
  body { padding-bottom: 0; }
  .ai-ball { bottom: 26px; }
  .ai-panel { bottom: 94px; }
}

/* ============================================================
   v3 增量：照片柔化 / 滚动淡入 / 卡片与按钮交互 / 21城
   ============================================================ */

/* 照片柔化（青瓷雾感滤镜：低饱和 + 轻雾感 + 微亮，对齐参考图6青绿调照片） */
.photo-warm > img { filter: saturate(0.8) brightness(1.05) contrast(0.94); }
.photo-warm { border: 1px solid rgba(26, 77, 69, 0.10); box-shadow: inset 0 0 0 1px rgba(253, 251, 243, 0.55); }

/* 滚动淡入（.js 由 app.js 注入；无 JS 环境内容默认可见） */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s var(--ease), transform 0.55s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* 卡片悬停上浮 + 阴影加深，图片轻微放大 */
.card, .biz-card, .scenery-card, .city-card { transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease); }
.card:hover, .biz-card:hover, .scenery-card:hover, .city-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.photo > img { transition: transform 0.5s var(--ease); }
.photo:hover > img { transform: scale(1.03); }

/* 按钮点击缩放反馈 */
.btn:active { transform: scale(0.97); }
.btn-ai-entry:active { transform: scale(0.97); }

/* AI渡悬浮球呼吸（scale 脉冲，柔和） */
@media (prefers-reduced-motion: no-preference) {
  .ai-ball { animation: ycdBreathe 3.4s ease-in-out infinite; }
  .ai-ball:hover { animation: none; transform: scale(1.05); }
}
@keyframes ycdBreathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.06); } }

/* 21城地图 */
.city-map { width: 100%; max-width: 640px; margin: 0 auto 22px; }
.city-map-svg { width: 100%; height: auto; display: block; }
.city-dot circle { cursor: pointer; }
.city-label { font-family: var(--font-body); font-size: 8.5px; fill: var(--color-ink-secondary); text-anchor: middle; }
.city-label--hq { font-size: 10px; font-weight: 600; fill: var(--color-accent-deep); }
@media (prefers-reduced-motion: no-preference) {
  .city-hq .city-lantern-glow { animation: ycdGlow 2.2s ease-in-out infinite; transform-origin: center; transform-box: fill-box; }
  .city-hq .city-lantern { animation: ycdBlink 2.2s ease-in-out infinite; transform-origin: center; transform-box: fill-box; }
}
@keyframes ycdGlow { 0%, 100% { opacity: 0.35; transform: scale(1); } 50% { opacity: 0.72; transform: scale(1.35); } }
@keyframes ycdBlink { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

/* 21城卡片网格 */
.city-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.city-group-title { font-size: 15px; margin: 20px 0 12px; color: var(--color-accent-deep); letter-spacing: 1px; }
.city-group-title:first-child { margin-top: 0; }
.city-card { display: block; background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius); padding: 0; overflow: hidden; color: inherit; }
.city-card:hover { color: inherit; }
.city-card-art { height: 92px; overflow: hidden; border-radius: var(--radius) var(--radius) 0 0; }
.city-card-art svg { width: 100%; height: 100%; display: block; object-fit: cover; }
.city-card-body { padding: 12px 14px 14px; }
.city-card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.city-card-top h3 { margin: 0; font-size: 16px; }
.city-card-sub { margin: 6px 0 0; font-size: 12px; color: var(--color-ink-secondary); }

@media (min-width: 640px) {
  .city-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 960px) {
  .city-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================================
   v5 增量：移动端顶栏图标按钮 / 4宫格快捷入口 / 数据看板 / 伪二维码
   ============================================================ */

/* 移动端顶栏图标按钮（搜索 / 扫码） */
.header-icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 999px; border: 1px solid var(--color-line);
  background: var(--color-card); color: var(--color-primary); flex: none;
}
.header-icon-btn svg { width: 20px; height: 20px; }
.header-icon-btn:hover { border-color: var(--color-primary); }
@media (min-width: 960px) {
  .header-icon-btn.scan-mobile { display: none; }
}

/* 4宫格快捷入口（首页移动端） */
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.quick-card {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius-lg); padding: 20px 10px 16px; color: inherit;
  box-shadow: var(--shadow-sm); text-align: center;
}
.quick-card:hover { color: inherit; border-color: var(--color-primary-fog); box-shadow: var(--shadow); }
.quick-card .q-ico { width: 44px; height: 44px; color: var(--color-primary); display: flex; align-items: center; justify-content: center; }
.quick-card .q-ico svg { width: 34px; height: 34px; }
.quick-card .q-label { font-size: 14px; font-weight: 600; color: var(--color-ink); }
.quick-card .q-sub { font-size: 11px; color: var(--color-ink-muted); margin-top: -6px; }
@media (min-width: 960px) {
  .quick-grid { grid-template-columns: repeat(4, 1fr); }
}

/* 数据看板（助残 / 大数字米白卡） */
.dash-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.dash-item { background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius-lg); padding: 22px 16px; text-align: center; box-shadow: var(--shadow-sm); }
.dash-item .dash-num { font-family: var(--font-title); font-size: 32px; font-weight: 700; color: var(--color-primary); line-height: 1.1; }
.dash-item .dash-num small { font-size: 18px; }
.dash-item .dash-label { font-size: 13px; color: var(--color-ink-secondary); margin-top: 6px; }
.dash-note { text-align: center; font-size: 12px; color: var(--color-ink-muted); margin: 14px 0 0; }
@media (min-width: 640px) {
  .dash-grid { grid-template-columns: repeat(4, 1fr); }
}

/* 伪二维码占位卡 */
.qr-card { background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius-lg); padding: 18px; max-width: 260px; margin: 0 auto; box-shadow: var(--shadow-sm); }
.qr-card svg { width: 100%; height: auto; display: block; }
.qr-card .qr-caption { text-align: center; font-size: 12px; color: var(--color-ink-muted); margin-top: 10px; }

/* 微信小程序入口卡 */
.mp-card { display: flex; gap: 18px; align-items: center; background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow-sm); }
.mp-card .mp-qr { flex: none; width: 96px; height: 96px; background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius-sm); padding: 6px; }
.mp-card .mp-qr svg { width: 100%; height: 100%; display: block; }
.mp-card .mp-body { flex: 1; min-width: 0; }
.mp-card .mp-body h3 { margin: 0 0 6px; font-size: 17px; }
.mp-card .mp-body p { margin: 0 0 10px; font-size: 13px; color: var(--color-ink-secondary); }
.mp-card .mp-tags { display: flex; flex-wrap: wrap; gap: 6px; }
@media (min-width: 640px) {
  .mp-card { max-width: 640px; }
}

/* 步骤流程卡（fly 页） */
.step-flow { display: flex; flex-direction: column; gap: 0; }
.step-card { display: flex; align-items: center; gap: 14px; background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius-lg); padding: 18px 16px; box-shadow: var(--shadow-sm); }
.step-card .st-ico { width: 46px; height: 46px; flex: none; border-radius: 50%; background: var(--color-primary-light); color: var(--color-primary); display: flex; align-items: center; justify-content: center; }
.step-card .st-ico svg { width: 26px; height: 26px; }
.step-card .st-body { flex: 1; }
.step-card .st-title { font-weight: 700; font-size: 15px; color: var(--color-ink); }
.step-card .st-desc { font-size: 12px; color: var(--color-ink-secondary); margin-top: 2px; }
.step-arrow { display: flex; justify-content: center; color: var(--color-primary-fog); padding: 4px 0; }
.step-arrow svg { width: 20px; height: 20px; transform: rotate(90deg); }
@media (min-width: 960px) {
  .step-flow { flex-direction: row; align-items: stretch; gap: 0; }
  .step-card { flex: 1; flex-direction: column; text-align: center; padding: 24px 14px; }
  .step-arrow { align-items: center; }
  .step-arrow svg { transform: rotate(0deg); }
}