/* ═══════════════════════════════════════════════════════════
   赵师兄 · 个人品牌站
   设计基调: 东方杂志感 · 墨蓝为纸 · 鎏金作印
   v2 · 2026-09-12 视觉升级
   ═══════════════════════════════════════════════════════════ */

/* 字体说明：不使用 Google Fonts（国内连接挂起会阻塞 load 事件）。
   标题走系统宋体栈（Mac 宋体-简 / Windows 中易宋体），正文走黑体栈。
   如需 webfont，请自托管后再引入。 */

:root {
  /* 色板 */
  --ink: #141d33;            /* 主深蓝——比旧 navy 更深，近墨 */
  --ink-2: #1d2a47;          /* 深蓝渐变副色 */
  --ink-3: #0d1526;          /* 最深的墨 */
  --gold: #c5a15e;           /* 鎏金 */
  --gold-bright: #dcc088;    /* 亮金，用于深底上的字 */
  --gold-dim: rgba(197, 161, 94, 0.14);
  --gold-line: rgba(197, 161, 94, 0.38);
  --paper: #f6f3ec;          /* 暖纸白 */
  --paper-2: #efeadf;        /* 纸色深一档 */
  --white: #ffffff;
  --text: #20263a;
  --text-secondary: #585e70;
  --text-muted: #959aa6;
  --border: #e3ddcd;
  --border-light: #ede9dd;
  /* 字体栈 */
  --serif: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
  --sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  /* 几何 */
  --radius: 3px;
  --radius-lg: 10px;
  --max-width: 1120px;
  --nav-height: 68px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.35s var(--ease);
  /* 旧变量别名（HTML 内联样式仍在引用，保持兼容） */
  --navy: var(--ink);
  --navy-light: var(--ink-2);
  --navy-dark: var(--ink-3);
  --gold-light: var(--gold-dim);
  --gold-glow: var(--gold-line);
  --cream: var(--paper);
  --cream-muted: var(--paper-2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

::selection { background: var(--gold); color: var(--ink-3); }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  /* 纸面颗粒感 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.025 0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: inherit; }

/* ═══ 导航 ═══ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(246, 243, 236, 0.82);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.nav.scrolled {
  background: rgba(246, 243, 236, 0.94);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 0 rgba(20, 29, 51, 0.03), 0 8px 24px rgba(20, 29, 51, 0.04);
}

.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 36px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-family: var(--serif); font-size: 21px; font-weight: 900;
  color: var(--ink); letter-spacing: 0.08em; text-decoration: none;
  display: flex; align-items: center; gap: 10px;
}
.nav-logo::before {
  content: ''; width: 9px; height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.nav-logo span { color: var(--gold); }

.nav-links { display: flex; gap: 2px; list-style: none; }
.nav-links a {
  position: relative;
  display: block; padding: 8px 16px; font-size: 13.5px; font-weight: 500;
  color: var(--text-secondary); text-decoration: none; letter-spacing: 0.06em;
  transition: var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; left: 16px; right: 16px; bottom: 2px;
  height: 1px; background: var(--gold);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-links a.active::after { transform: scaleX(1); }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 6px;
}
.nav-toggle span {
  display: block; width: 22px; height: 1.5px;
  background: var(--ink); transition: var(--transition);
}

@media (max-width: 820px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: var(--nav-height); left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--border);
    padding: 14px 36px 18px; gap: 2px;
    box-shadow: 0 16px 32px rgba(20, 29, 51, 0.06);
  }
  .nav-links.open a { padding: 10px 0; }
  .nav-links.open a::after { left: 0; right: auto; width: 24px; }
}

/* ═══ 通用容器 / 段落 ═══ */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 40px; }
@media (max-width: 640px) { .container { padding: 0 22px; } }

.section { padding: 96px 0; }
.section:last-of-type { padding-bottom: 110px; }
@media (max-width: 640px) { .section { padding: 56px 0; } }

/* 段首：编号 kicker + 大标题，杂志栏目的感觉 */
.section-label {
  display: flex; align-items: center; gap: 14px;
  font-size: 11px; font-weight: 600; color: var(--gold);
  letter-spacing: 0.22em; text-transform: uppercase; margin-bottom: 14px;
}
.section-label::after {
  content: ''; height: 1px; width: 56px; background: var(--gold-line);
}
.section-title {
  font-family: var(--serif); font-size: 32px; font-weight: 900;
  color: var(--ink); letter-spacing: 0.05em; margin-bottom: 40px;
  line-height: 1.3;
}
@media (max-width: 640px) { .section-title { font-size: 24px; margin-bottom: 28px; } }

/* ═══ 首页 Hero —— 杂志封面 ═══ */
.hero {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-height) + 96px) 0 110px;
  background:
    radial-gradient(900px 500px at 82% -10%, rgba(197, 161, 94, 0.13), transparent 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 58%, var(--ink) 100%);
  color: var(--white);
}
/* 蓝图格线 */
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(80% 90% at 50% 20%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(80% 90% at 50% 20%, #000 30%, transparent 100%);
  pointer-events: none;
}
/* 底部金线收边 */
.hero::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold) 18%, var(--gold) 82%, transparent);
  opacity: 0.55;
}

.hero-inner {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 72px;
}
@media (max-width: 860px) {
  .hero-inner { flex-direction: column; text-align: center; gap: 44px; }
  .hero { padding: calc(var(--nav-height) + 56px) 0 72px; }
}

/* 右侧竖排slogan */
.hero-vertical {
  position: absolute; right: 34px; top: 50%; transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--serif); font-size: 15px; letter-spacing: 0.55em;
  color: rgba(220, 192, 136, 0.5);
  user-select: none; z-index: 1;
}
@media (max-width: 1100px) { .hero-vertical { display: none; } }

.hero-kicker {
  font-size: 11.5px; letter-spacing: 0.34em; font-weight: 600;
  color: var(--gold-bright); text-transform: uppercase;
  display: flex; align-items: center; gap: 12px; margin-bottom: 22px;
}
.hero-kicker::before { content: ''; width: 34px; height: 1px; background: var(--gold); }
@media (max-width: 860px) { .hero-kicker { justify-content: center; } }

.hero-text h1 {
  font-family: var(--serif); font-size: 64px; font-weight: 900;
  letter-spacing: 0.1em; line-height: 1.1;
}
.hero-text h1 .en {
  display: block;
  font-family: var(--sans); font-size: 12px; font-weight: 500;
  letter-spacing: 0.5em; color: rgba(255,255,255,0.38);
  margin-top: 14px; text-transform: uppercase;
}
@media (max-width: 640px) { .hero-text h1 { font-size: 44px; } }

.hero-tags { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 9px; }
@media (max-width: 860px) { .hero-tags { justify-content: center; } }

.hero-tag {
  font-size: 12.5px; padding: 6px 15px;
  border: 1px solid rgba(255,255,255,0.22); border-radius: 2px;
  color: rgba(255,255,255,0.78);
  letter-spacing: 0.06em; font-weight: 500;
  transition: var(--transition);
}
.hero-tag:hover { border-color: var(--gold-line); color: var(--gold-bright); }
.hero-tag.accent {
  background: var(--gold); border-color: var(--gold);
  color: var(--ink-3); font-weight: 700;
}
.hero-tag.accent:hover { color: var(--ink-3); background: var(--gold-bright); }

.hero-bio {
  margin-top: 26px; font-size: 15px; color: rgba(255,255,255,0.62);
  max-width: 540px; line-height: 2;
}
.hero-bio strong { color: var(--gold-bright); font-weight: 600; }
@media (max-width: 860px) { .hero-bio { margin-inline: auto; } }

.hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
@media (max-width: 860px) { .hero-cta { justify-content: center; } }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 30px; font-size: 14px; letter-spacing: 0.12em;
  text-decoration: none; font-weight: 600;
  transition: var(--transition); border-radius: 2px;
}
.btn-gold {
  background: var(--gold); color: var(--ink-3);
  box-shadow: 0 8px 24px rgba(197, 161, 94, 0.28);
}
.btn-gold:hover { background: var(--gold-bright); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(197, 161, 94, 0.36); }
.btn-ghost {
  border: 1px solid rgba(255,255,255,0.28); color: rgba(255,255,255,0.85);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-bright); transform: translateY(-2px); }
.btn .arr { transition: transform 0.3s var(--ease); }
.btn:hover .arr { transform: translateX(4px); }

/* 照片：拱门画框 */
.hero-photo { flex-shrink: 0; position: relative; }
.hero-photo .frame {
  width: 232px; height: 300px;
  border-radius: 120px 120px 6px 6px;
  overflow: hidden; position: relative; z-index: 1;
  box-shadow: 0 24px 60px rgba(0,0,0,0.38);
}
.hero-photo .frame img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  display: block;
}
/* 偏移金描边 */
.hero-photo::before {
  content: ''; position: absolute; inset: -14px;
  border: 1px solid var(--gold-line);
  border-radius: 136px 136px 12px 12px;
  transform: translate(10px, 8px);
}
/* 印章 */
.hero-seal {
  position: absolute; right: -16px; bottom: 22px; z-index: 2;
  width: 52px; height: 52px;
  background: var(--gold); color: var(--ink-3);
  font-family: var(--serif); font-weight: 900; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
  writing-mode: vertical-rl; letter-spacing: 0.1em;
  border-radius: 4px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  transform: rotate(-4deg);
}
@media (max-width: 860px) {
  .hero-photo .frame { width: 196px; height: 254px; }
  .hero-seal { right: -10px; }
}

/* Hero 入场编排 */
.hero-kicker, .hero-text h1, .hero-tags, .hero-bio, .hero-cta,
.hero-photo { animation: heroUp 0.9s var(--ease) both; }
.hero-text h1 { animation-delay: 0.08s; }
.hero-tags { animation-delay: 0.16s; }
.hero-bio { animation-delay: 0.24s; }
.hero-cta { animation-delay: 0.32s; }
.hero-photo { animation-delay: 0.18s; }
@keyframes heroUp {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ═══ 内页页头 ═══ */
.page-header {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-height) + 88px) 0 76px;
  background:
    radial-gradient(760px 420px at 88% -16%, rgba(197, 161, 94, 0.12), transparent 60%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 70%, var(--ink) 100%);
  color: var(--white);
}
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(75% 100% at 50% 0%, #000 25%, transparent 100%);
  -webkit-mask-image: radial-gradient(75% 100% at 50% 0%, #000 25%, transparent 100%);
  pointer-events: none;
}
.page-header::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold) 18%, var(--gold) 82%, transparent);
  opacity: 0.55;
}
.page-header .container { position: relative; z-index: 1; }
.page-header .section-label { color: var(--gold-bright); }
.page-header .section-label::after { background: var(--gold-line); }
.page-header h1 {
  font-family: var(--serif); font-size: 46px; font-weight: 900;
  letter-spacing: 0.06em; line-height: 1.2;
}
.page-header p {
  margin-top: 18px; font-size: 15.5px; color: rgba(255,255,255,0.58);
  max-width: 620px; letter-spacing: 0.03em; line-height: 1.9;
}
.page-header p strong, .page-header p.gold-note { color: var(--gold-bright); }

@media (max-width: 640px) {
  .page-header { padding: calc(var(--nav-height) + 56px) 0 48px; }
  .page-header h1 { font-size: 30px; }
  .page-header p { font-size: 14px; }
}

/* ═══ 卡片 ═══ */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
@media (max-width: 768px) { .card-grid { grid-template-columns: 1fr; } }

.card-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 640px) { .card-grid-2 { grid-template-columns: 1fr; } }

.card {
  position: relative;
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px 26px;
  transition: var(--transition);
  overflow: hidden;
}
/* 顶部金线：悬停时生长 */
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  transform: scaleX(0.18); transform-origin: left;
  transition: transform 0.5s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--gold-line);
  box-shadow: 0 18px 40px rgba(20, 29, 51, 0.08);
}
.card:hover::before { transform: scaleX(1); }

.card-num {
  font-family: var(--serif);
  font-size: 12px; color: var(--gold); letter-spacing: 0.18em;
  margin-bottom: 12px; font-weight: 700;
}
.eff-badge {
  font-family: var(--serif); font-size: 34px; font-weight: 900;
  color: var(--gold); margin-bottom: 2px; line-height: 1;
  letter-spacing: 0.01em;
}
.eff-label { font-size: 11px; color: var(--text-muted); letter-spacing: 0.12em; margin-bottom: 10px; }
.card h3 {
  font-family: var(--serif); font-size: 18.5px; font-weight: 700;
  color: var(--ink); margin-bottom: 10px; letter-spacing: 0.03em;
}
.card p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.card p strong { color: var(--ink); }

/* 卡片内链 */
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 18px;
  font-size: 13px; color: var(--gold); text-decoration: none;
  letter-spacing: 0.08em; font-weight: 600;
}
.card-link .arr { transition: transform 0.3s var(--ease); }
.card-link:hover .arr { transform: translateX(4px); }
.card-link::after {
  content: ''; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 1px; background: var(--gold);
  transform: scaleX(0); transform-origin: left; transition: transform 0.35s var(--ease);
}
.card-link { position: relative; }
.card-link:hover::after { transform: scaleX(1); }

/* ═══ 深色数据盒 ═══ */
.highlight-box {
  position: relative; overflow: hidden;
  background:
    radial-gradient(600px 300px at 90% -20%, rgba(197, 161, 94, 0.14), transparent 60%),
    linear-gradient(150deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 48px 48px 40px;
  box-shadow: 0 24px 60px rgba(20, 29, 51, 0.18);
}
.highlight-box::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright), var(--gold));
}
.highlight-box h3 {
  font-family: var(--serif); font-size: 30px; font-weight: 900;
  letter-spacing: 0.04em; margin-bottom: 8px;
}
.highlight-box .sub {
  font-size: 13.5px; color: rgba(255,255,255,0.5); letter-spacing: 0.08em;
  margin-bottom: 36px;
}
@media (max-width: 640px) { .highlight-box { padding: 32px 24px; } }

.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  text-align: center;
}
.stat-grid > div {
  padding: 6px 16px;
  border-left: 1px solid rgba(255,255,255,0.1);
}
.stat-grid > div:first-child { border-left: none; }
@media (max-width: 500px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .stat-grid > div:nth-child(3) { border-left: none; }
}

.stat-val {
  font-family: var(--serif); font-size: 46px; font-weight: 900;
  color: var(--gold-bright); line-height: 1.05; letter-spacing: 0.01em;
}
.stat-label {
  font-size: 12px; color: rgba(255,255,255,0.48);
  letter-spacing: 0.1em; margin-top: 8px;
}

/* ═══ 表格 ═══ */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.data-table th {
  text-align: left; font-size: 11px; color: var(--gold);
  background: var(--paper-2);
  letter-spacing: 0.16em; font-weight: 600; padding: 14px 18px;
  border-bottom: 1px solid var(--border); text-transform: uppercase;
  white-space: nowrap;
}
.data-table td {
  padding: 15px 18px; border-bottom: 1px solid var(--border-light);
  font-size: 14px; color: var(--text-secondary); vertical-align: top;
}
.data-table tbody tr { transition: background 0.25s; }
.data-table tbody tr:hover { background: var(--paper); }
.data-table tr:last-child td { border-bottom: none; }
.data-table .num { color: var(--gold); font-weight: 700; font-family: var(--serif); }
.data-table td strong { color: var(--ink); }

/* ═══ 客户墙 ═══ */
.client-bar { display: flex; flex-wrap: wrap; gap: 10px; }
.client-chip {
  font-size: 13.5px; padding: 9px 20px;
  background: var(--white);
  border: 1px solid var(--border); color: var(--text-secondary);
  letter-spacing: 0.05em; border-radius: 2px;
  transition: var(--transition);
}
.client-chip:hover {
  border-color: var(--gold-line); color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(20, 29, 51, 0.06);
}
.client-chip em {
  font-style: normal; font-weight: 700; color: var(--ink);
  font-family: var(--serif); letter-spacing: 0.04em;
}

/* ═══ 引言墙 ═══ */
.quote-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
@media (max-width: 900px) { .quote-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .quote-grid { grid-template-columns: 1fr; } }

.quote {
  background: var(--white); padding: 28px 26px;
  font-size: 13.5px; color: var(--text-secondary); line-height: 1.9;
  transition: background 0.3s;
}
.quote:hover { background: var(--paper); }
.quote::before {
  content: '“'; font-family: var(--serif);
  color: var(--gold); opacity: 0.4; font-size: 34px;
  line-height: 0; vertical-align: -10px; margin-right: 3px;
}
.quote span { color: var(--text-muted); }

/* ═══ 案例（陪跑/落地页） ═══ */
.case {
  position: relative;
  border-top: 1px solid var(--border); padding: 48px 0 44px;
}
.case:last-child { border-bottom: 1px solid var(--border); }

.case-header { display: flex; align-items: baseline; gap: 18px; margin-bottom: 26px; }
.case-hdr-num {
  font-family: var(--serif); font-size: 30px;
  font-weight: 900; color: var(--gold); flex-shrink: 0;
  line-height: 1; opacity: 0.85;
}
.case-header h3 {
  font-family: var(--serif); font-size: 21px;
  font-weight: 900; color: var(--ink); letter-spacing: 0.02em;
}

.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 40px; }
@media (max-width: 640px) { .case-grid { grid-template-columns: 1fr; } }

.case-col h4 {
  display: flex; align-items: center; gap: 10px;
  font-size: 11px; font-weight: 600; color: var(--gold);
  letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 10px;
}
.case-col h4::after { content: ''; flex: 0 0 28px; height: 1px; background: var(--gold-line); }
.case-col p, .case-col li { font-size: 14px; color: var(--text-secondary); line-height: 1.85; }
.case-col p strong { color: var(--ink); }
.case-col ul { list-style: none; padding: 0; }
.case-col ul li::before {
  content: ''; display: inline-block; width: 5px; height: 5px;
  background: var(--gold); transform: rotate(45deg);
  margin-right: 9px; vertical-align: middle; opacity: 0.7;
}

.metric {
  display: inline-block; background: var(--gold-dim);
  border: 1px solid var(--gold-line);
  color: var(--ink); font-size: 13px; font-weight: 600;
  padding: 5px 14px; border-radius: 2px;
  margin-right: 8px; margin-top: 8px; letter-spacing: 0.04em;
  transition: var(--transition);
}
.metric:hover { background: var(--gold); color: var(--ink-3); }

/* ═══ 文章列表 ═══ */
.article-list { display: flex; flex-direction: column; }
.article-item {
  display: flex; align-items: baseline; gap: 22px;
  padding: 24px 0; border-bottom: 1px solid var(--border-light);
  text-decoration: none; transition: var(--transition);
}
.article-item:hover { background: var(--white); margin: 0 -20px; padding: 24px 20px; }
.article-date {
  font-size: 12px; color: var(--gold); white-space: nowrap;
  letter-spacing: 0.08em; flex-shrink: 0; font-weight: 600;
}
.article-item h3 {
  font-family: var(--serif); font-size: 17.5px;
  font-weight: 700; color: var(--ink); letter-spacing: 0.02em;
}
.article-item p { font-size: 13px; color: var(--text-secondary); margin-top: 4px; line-height: 1.7; }
@media (max-width: 500px) { .article-item { flex-direction: column; gap: 6px; } }

/* ═══ 课程卡（横向） ═══ */
.course-grid { display: flex; flex-direction: column; gap: 18px; }
.course-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px 30px;
  display: flex; gap: 28px; align-items: flex-start;
  transition: var(--transition);
}
.course-card:hover { border-color: var(--gold-line); transform: translateY(-3px); box-shadow: 0 16px 36px rgba(20, 29, 51, 0.07); }
@media (max-width: 600px) { .course-card { flex-direction: column; gap: 12px; } }

.course-meta { flex-shrink: 0; min-width: 76px; text-align: center; padding-top: 2px; }
.course-meta .dur {
  font-family: var(--serif); font-size: 24px; font-weight: 900;
  color: var(--gold); line-height: 1;
}
.course-meta .dur-sub { font-size: 11px; color: var(--text-muted); letter-spacing: 0.08em; margin-top: 4px; }

.course-content h3 {
  font-family: var(--serif); font-size: 18.5px;
  font-weight: 700; color: var(--ink); margin-bottom: 8px;
}
.course-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }

/* ═══ 半天课卡（课程页 Day 卡） ═══ */
.day-card {
  position: relative;
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px 30px 26px;
  transition: var(--transition); overflow: hidden;
}
.day-card::before {
  content: ''; position: absolute; top: 0; left: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--gold), var(--gold-bright));
}
.day-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(20, 29, 51, 0.08); border-color: var(--gold-line); }
.day-card .day-tag {
  font-size: 11.5px; color: var(--gold); font-weight: 700;
  letter-spacing: 0.18em; margin-bottom: 12px;
}
.day-card h3 {
  font-family: var(--serif); font-size: 17px; font-weight: 700;
  color: var(--ink); margin-bottom: 12px; letter-spacing: 0.02em;
}
.day-card ul { list-style: none; padding: 0; font-size: 14px; color: var(--text-secondary); line-height: 2.1; }
.day-card ul li::before {
  content: ''; display: inline-block; width: 4px; height: 4px;
  background: var(--gold); transform: rotate(45deg);
  margin-right: 9px; vertical-align: middle; opacity: 0.7;
}
.day-card .day-gain {
  margin-top: 14px; padding-top: 12px;
  border-top: 1px dashed var(--border);
  font-size: 12.5px; color: var(--gold); font-weight: 600; letter-spacing: 0.04em;
}

/* ═══ 混沌块 ═══ */
.hundun-block {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 34px 34px; margin-bottom: 20px;
  transition: var(--transition);
}
.hundun-block:hover { border-color: var(--gold-line); box-shadow: 0 14px 32px rgba(20, 29, 51, 0.06); }
.hundun-block h3 {
  font-family: var(--serif); font-size: 20px; font-weight: 700;
  color: var(--ink); margin-bottom: 8px;
}
.hundun-block .location {
  font-size: 12px; color: var(--gold); letter-spacing: 0.1em;
  font-weight: 700; margin-bottom: 16px;
}

/* ═══ 时间线 ═══ */
.timeline { position: relative; padding-left: 30px; max-width: 780px; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 6px; bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--border) 30%, var(--border));
}
.timeline-item { position: relative; padding-bottom: 34px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ''; position: absolute; left: -27px; top: 8px;
  width: 9px; height: 9px; transform: rotate(45deg);
  background: var(--paper); border: 2px solid var(--gold);
  transition: var(--transition);
}
.timeline-item:hover::before { background: var(--gold); }
.timeline-item h4 {
  font-family: var(--serif);
  font-size: 16.5px; font-weight: 700; color: var(--ink);
  margin-bottom: 4px; letter-spacing: 0.02em;
}
.timeline-item p { font-size: 14px; color: var(--text-secondary); max-width: 640px; }

/* ═══ 关注 / 二维码卡 ═══ */
.qr-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 34px 28px;
  text-align: center; transition: var(--transition);
}
.qr-card:hover { transform: translateY(-4px); border-color: var(--gold-line); box-shadow: 0 18px 40px rgba(20, 29, 51, 0.08); }
.qr-card .qr-img {
  width: 176px; height: 176px; object-fit: cover;
  border-radius: 4px; border: 1px solid var(--border);
  padding: 6px; background: var(--white);
  margin: 0 auto 18px; display: block;
  box-shadow: 0 6px 18px rgba(20, 29, 51, 0.06);
}
.qr-card .qr-placeholder {
  width: 176px; height: 176px; margin: 0 auto 18px;
  border: 1px dashed var(--gold-line); border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 12.5px; letter-spacing: 0.05em;
  background: var(--paper);
}
.qr-card h3 { font-family: var(--serif); font-size: 17px; color: var(--ink); margin-bottom: 4px; }
.qr-card .qr-name { font-size: 13.5px; color: var(--text-secondary); }
.qr-card .qr-desc { font-size: 12px; color: var(--text-muted); margin-top: 4px; letter-spacing: 0.04em; }

/* ═══ 页脚 ═══ */
.footer {
  position: relative;
  background: var(--ink-3); color: rgba(255,255,255,0.5);
  padding: 56px 0 48px;
  font-size: 13px; letter-spacing: 0.06em;
}
.footer::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold) 20%, var(--gold) 80%, transparent);
  opacity: 0.5;
}
.footer-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.footer-brand {
  font-family: var(--serif); font-size: 17px; font-weight: 900;
  color: var(--white); letter-spacing: 0.08em;
  display: flex; align-items: center; gap: 9px; text-decoration: none;
}
.footer-brand::before { content: ''; width: 7px; height: 7px; background: var(--gold); transform: rotate(45deg); }
.footer-brand span { color: var(--gold); }
.footer-note { line-height: 1.9; }
.footer-note b { color: var(--gold-bright); font-weight: 600; }
@media (max-width: 640px) { .footer-inner { flex-direction: column; text-align: center; } }

/* ═══ 滚动显现 ═══ */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-kicker, .hero-text h1, .hero-tags, .hero-bio, .hero-cta, .hero-photo { animation: none; }
}

/* ═══ 返回顶部 ═══ */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--ink); color: var(--gold-bright);
  border: 1px solid var(--gold-line);
  cursor: pointer; opacity: 0; pointer-events: none;
  font-size: 17px; transition: var(--transition);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(20, 29, 51, 0.25);
}
.back-top.visible { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--gold); color: var(--ink-3); transform: translateY(-3px); }