/* 小录小录门户首页（双业务线入口 + 案例）
   形状约定（全页一致）：卡片圆角 16px，按钮/胶囊全圆角 999px。
   配色约定：页面基底为中性石灰白；商业线（言脉）统一用深蓝青 --biz，家族线（家音）统一用暖棕金 --fam，不混用。 */
:root {
  --base: #fafaf9;
  --card: #ffffff;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --biz: #0369a1;        /* 商业线主色（取自数字人海报的蓝青） */
  --biz-tint: #f0f9ff;
  --biz-deep: #0a1628;
  --fam: #8a5a22;        /* 家族线主色（取自家族记忆海报的暖金） */
  --fam-tint: #faf5ec;
  --r-card: 16px;
  --r-pill: 999px;
  --shadow: 0 1px 3px rgba(28, 25, 23, .07), 0 8px 28px rgba(28, 25, 23, .06);
  --shadow-up: 0 4px 10px rgba(28, 25, 23, .08), 0 18px 44px rgba(28, 25, 23, .12);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--base); color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
img { display: block; }
a { text-decoration: none; color: inherit; }

/* ---------- 顶部导航（单行，64px） ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(250, 250, 249, .88);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1160px; margin: 0 auto; padding: 0 24px; height: 64px;
  display: flex; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { font-size: 20px; align-self: center; }
.brand-logo { width: 34px; height: 34px; align-self: center; filter: drop-shadow(0 1px 3px rgba(120, 84, 40, .25)); }
.brand-name {
  /* 楷体配书童头像的古风气质；宋体 faux-bold 笔画发糊（SimSun 无真粗体），故字号放大、字重收敛 */
  font-family: "KaiTi", "STKaiti", "Kaiti SC", "楷体", serif;
  font-size: 26px; font-weight: 600; letter-spacing: 3px;
}
/* 书法字标（行草"小录小录"，brand_xll.png 透明 PNG）：导航 30px 适中，页脚 20px */
.brand-word { height: 30px; width: auto; align-self: center; }
.foot-word { height: 20px; vertical-align: middle; }
.brand-sub { font-size: 13px; color: var(--muted); letter-spacing: 2px; }
.nav-links { margin-left: auto; display: flex; gap: 28px; }
.nav-links a { font-size: 14px; color: var(--muted); padding: 6px 2px; }
.nav-links a:hover { color: var(--ink); }

/* ---------- 屏幕阅读器专用（页面主标题，视觉隐藏） ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 两个大入口 ---------- */
.entrances {
  max-width: 1160px; margin: 0 auto; padding: 40px 24px 72px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
.ent-card {
  --acc: var(--biz);
  display: flex; flex-direction: column;
  background: var(--card); border-radius: var(--r-card); box-shadow: var(--shadow);
  overflow: hidden; transition: transform .25s cubic-bezier(.16, 1, .3, 1), box-shadow .25s;
}
#ent-family { --acc: var(--fam); }
.ent-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-up); }
.ent-card:focus-visible { outline: 3px solid var(--acc); outline-offset: 2px; }
.ent-media { overflow: hidden; aspect-ratio: 16/9.6; }
.ent-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s cubic-bezier(.16, 1, .3, 1);
}
#ent-biz .ent-media img { object-position: center 58%; } /* 竖版海报横裁时人物居中偏下（用户指定） */
.ent-card:hover .ent-media img { transform: scale(1.045); }
.ent-body { padding: 26px 28px 30px; display: flex; flex-direction: column; flex: 1; }
.ent-tag { font-size: 13px; font-weight: 600; letter-spacing: 2px; color: var(--acc); margin-bottom: 10px; }
.ent-body h2 { font-size: 25px; letter-spacing: 1px; margin-bottom: 12px; }
.ent-body > p { font-size: 14.5px; line-height: 1.8; color: var(--muted); margin-bottom: 18px; }
.ent-points {
  list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px;
  margin-bottom: 24px;
}
.ent-points li {
  font-size: 14px; color: #44403c; display: flex; align-items: center; gap: 9px;
}
.ent-points li::before {
  content: ''; flex: none; width: 12px; height: 2px; background: var(--acc); border-radius: 1px;
}
.ent-cta {
  margin-top: auto; align-self: flex-start;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 26px; border-radius: var(--r-pill);
  background: var(--acc); color: #fff; font-size: 15px; font-weight: 600; letter-spacing: 1px;
  transition: filter .15s, transform .1s;
}
.ent-cta::after { content: '→'; font-weight: 400; }
.ent-card:hover .ent-cta { filter: brightness(1.08); }
.ent-cta:active { transform: translateY(1px); }

/* ---------- 案例区 ---------- */
.cases { padding: 64px 24px 76px; }
.cases-head, .case-grid-biz, .case-grid-fam, .cases-note { max-width: 1160px; margin-left: auto; margin-right: auto; }
.cases-head { margin-bottom: 34px; }
.cases-head h2 { font-size: clamp(23px, 2.6vw, 30px); letter-spacing: 1px; margin-bottom: 10px; }
.cases-head p { font-size: 14.5px; color: var(--muted); }

/* 商业案例：浅青底 + 数据卡（非对称 7/5 交替网格） */
.cases-biz { background: var(--biz-tint); }
.case-grid-biz {
  display: grid; grid-template-columns: repeat(12, 1fr); gap: 20px;
}
.case-card {
  background: var(--card); border-radius: var(--r-card); box-shadow: var(--shadow);
  padding: 26px 28px;
}
.case-card:nth-child(1) { grid-column: span 7; }
.case-card:nth-child(2) { grid-column: span 5; }
.case-card:nth-child(3) { grid-column: span 5; }
.case-card:nth-child(4) { grid-column: span 7; }
.case-client { font-size: 13px; color: var(--muted); letter-spacing: 1px; margin-bottom: 8px; }
.case-title { font-size: 19px; font-weight: 700; letter-spacing: .5px; margin-bottom: 20px; }
.case-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.stat b {
  display: block; font-size: 27px; font-weight: 700; color: var(--biz);
  font-variant-numeric: tabular-nums; letter-spacing: .5px; margin-bottom: 2px;
}
.stat span { font-size: 12.5px; color: var(--muted); }

/* 家族案例：暖纸底 + 引述卡（第二列纵向错位，与商业区节奏区分） */
.cases-fam { background: var(--fam-tint); }
.case-grid-fam {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}
.story-card {
  background: var(--card); border-radius: var(--r-card); box-shadow: var(--shadow);
  padding: 28px 30px 24px;
}
.case-grid-fam .story-card:nth-child(even) { transform: translateY(26px); }
.case-grid-fam { padding-bottom: 26px; }
.story-card blockquote {
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  font-size: 18.5px; line-height: 1.75; color: #3d2f1c; margin-bottom: 18px;
}
.story-who { font-size: 13.5px; font-weight: 600; color: var(--fam); margin-bottom: 6px; }
.story-facts { font-size: 12.5px; color: var(--muted); }
.cases-note { margin-top: 28px; font-size: 12px; color: #a8a29e; }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--line); background: var(--card); }
.foot-inner {
  max-width: 1160px; margin: 0 auto; padding: 30px 24px 18px;
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
}
.foot-brand { display: flex; align-items: baseline; gap: 8px; font-size: 15px; }
.foot-brand b {
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  font-size: 19px; letter-spacing: 4px;
}
.foot-tag { color: var(--muted); font-size: 13px; }
.foot-links { margin-left: auto; display: flex; gap: 22px; }
.foot-links a { font-size: 13.5px; color: var(--muted); }
.foot-links a:hover { color: var(--ink); }
.foot-copy {
  max-width: 1160px; margin: 0 auto; padding: 0 24px 26px;
  font-size: 12px; color: #a8a29e;
}

/* ---------- 动效（reduced-motion 或无 JS 时全部关闭且元素默认可见） ---------- */
@media (prefers-reduced-motion: no-preference) {
  .ent-card { animation: fadeUp .7s cubic-bezier(.16, 1, .3, 1) both; }
  #ent-family { animation-delay: .1s; }
  /* 仅在 JS 可用时先做隐藏，由 IntersectionObserver 补 .in；无 JS 时内容始终可见 */
  html.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s, transform .6s cubic-bezier(.16, 1, .3, 1); }
  html.js .reveal.in { opacity: 1; transform: none; }
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: none; }
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ent-card, .ent-media img { transition: none; }
}

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .brand-sub { display: none; }
  .brand-word { height: 26px; }
  .nav-inner { padding: 0 16px; }
  .nav-links { gap: 16px; }
  .entrances { grid-template-columns: 1fr; padding: 28px 20px 52px; }
  .cases { padding: 48px 20px 60px; }
  .case-grid-biz { grid-template-columns: 1fr; }
  .case-card:nth-child(n) { grid-column: auto; }
  .case-grid-fam { grid-template-columns: 1fr; padding-bottom: 0; }
  .case-grid-fam .story-card:nth-child(even) { transform: none; }
  .case-stats { gap: 26px; }
  .foot-inner { gap: 14px; }
  .foot-links { margin-left: 0; }
}