/* ============================================================
 * miaoyinyue.com/case/ · 喵音儿童 AI 课程落地案例
 * 自成一体的独立页面（不依赖主站 min.css）：这个页面是要被单独转发的，
 * 一整个目录搬走就能跑。零外部依赖、零 JS、零图片请求。
 * 设计变量与主站保持一致（暗色霓虹：青 / 紫 / 粉 / 金）。
 * ============================================================ */

:root {
  --bg: #05070f;
  --line: rgba(255, 255, 255, 0.10);
  --line-hi: rgba(255, 255, 255, 0.22);
  --txt: #e6ecf8;
  --txt-2: #b3bfd6;      /* 比主站略亮一档：长段落正文要保证对比度 */
  --txt-3: #8090b0;
  --gold: #ffc247;
  --cyan: #22e0c8;
  --magenta: #d653b8;
  --purple: #b37bff;
  --pink: #ff3d81;
  --card: rgba(255, 255, 255, 0.035);
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 键盘可见焦点：全站唯一的交互元素就是链接，必须能看清焦点在哪 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
 * 背景：两层静态星点（案例页是"读"的页面，不做流星/星链动画抢注意力）
 * ============================================================ */
.sky {
  position: fixed; inset: 0; z-index: -2;
  pointer-events: none; overflow: hidden;
}
.sky .far {
  position: absolute; inset: 0;
  /* prettier-ignore */
  background-image:
    radial-gradient(circle at 8% 14%,  rgba(255,255,255,0.34) 0.5px, transparent 1.1px),
    radial-gradient(circle at 23% 71%, rgba(255,255,255,0.28) 0.5px, transparent 1.1px),
    radial-gradient(circle at 37% 22%, rgba(255,255,255,0.32) 0.5px, transparent 1.1px),
    radial-gradient(circle at 51% 88%, rgba(255,255,255,0.26) 0.5px, transparent 1.1px),
    radial-gradient(circle at 64% 41%, rgba(255,255,255,0.34) 0.5px, transparent 1.1px),
    radial-gradient(circle at 78% 63%, rgba(255,255,255,0.28) 0.5px, transparent 1.1px),
    radial-gradient(circle at 89% 17%, rgba(255,255,255,0.30) 0.5px, transparent 1.1px),
    radial-gradient(circle at 94% 82%, rgba(255,255,255,0.26) 0.5px, transparent 1.1px),
    radial-gradient(circle at 15% 52%, rgba(255,255,255,0.24) 0.5px, transparent 1.1px),
    radial-gradient(circle at 44% 61%, rgba(255,255,255,0.30) 0.5px, transparent 1.1px),
    radial-gradient(circle at 71% 8%,  rgba(255,255,255,0.26) 0.5px, transparent 1.1px),
    radial-gradient(circle at 31% 95%, rgba(255,255,255,0.24) 0.5px, transparent 1.1px);
}
.sky .vid {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(80, 110, 190, 0.09), transparent 70%);
}

/* ============================================================
 * 顶栏
 * ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(5, 7, 15, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  max-width: 820px; margin: 0 auto; padding: 13px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand {
  display: flex; align-items: baseline; gap: 8px;
  font-size: 15px; font-weight: 600;
  color: var(--txt); text-decoration: none;
}
.brand i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px var(--cyan);
  display: inline-block;
}
.brand em {
  font-style: normal; font-family: var(--mono);
  font-size: 11.5px; color: var(--txt-3); letter-spacing: 0.08em;
}
.nav-links { display: flex; align-items: center; gap: 18px; }
.nav-links a {
  font-size: 14px; color: var(--txt-2); text-decoration: none;
  transition: color 0.18s ease;
}
.nav-links a:hover { color: var(--cyan); }
.nav-links a.on { color: var(--cyan); }
.nav-cta {
  padding: 6px 14px;
  border: 1px solid rgba(34, 224, 200, 0.35);
  border-radius: 999px;
  background: rgba(34, 224, 200, 0.08);
  color: var(--cyan);
}
.nav-cta:hover { color: #fff; border-color: rgba(34, 224, 200, 0.65); }

/* ============================================================
 * 版心
 * ============================================================ */
.wrap { max-width: 820px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
main { padding: 9vh 0 5vh; }
section[id] { scroll-margin-top: 78px; }

.kicker {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 14px;
}

/* ---------- HERO ---------- */
.hero-c { padding-bottom: 6vh; }
.hero-c h1 {
  font-size: clamp(34px, 6.4vw, 54px);
  line-height: 1.1; margin: 0 0 10px; letter-spacing: -0.01em;
}
.hero-c .sub-c {
  font-family: var(--mono);
  font-size: 13.5px; letter-spacing: 0.04em;
  color: var(--txt-3); margin: 0 0 22px;
}
.hero-c .lead-c {
  font-size: 17px; color: var(--txt-2);
  max-width: 620px; margin: 0 0 32px;
}
.hero-c .lead-c strong { color: var(--txt); font-weight: 600; }

/* 四个核心数字：这页最贵的资产，扫一眼就能记住 */
.kv {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px; margin: 0; padding: 0;
}
.kv > div {
  padding: 16px 12px;
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--card);
  text-align: center;
}
.kv dt {
  font-family: var(--mono);
  font-size: clamp(24px, 4.6vw, 34px); font-weight: 700;
  color: var(--cyan); line-height: 1.1; margin: 0;
}
.kv dd {
  margin: 5px 0 0; font-size: 12.5px; color: var(--txt-3);
  letter-spacing: 0.04em;
}
/* KPI 下面那行补充事实：年级跨度 / 课时长度 */
.kv-note {
  margin: 12px 0 0; text-align: center;
  font-size: 12.5px; color: var(--txt-3); letter-spacing: 0.03em;
}
.kv-note b { color: var(--txt-2); font-weight: 600; }
.kv-note .sep { margin: 0 6px; opacity: 0.45; }

/* ---------- 通用区块 ---------- */
.block { padding: 44px 0; border-top: 1px solid var(--line); }
.block h2 {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--txt-3); font-weight: 500;
  margin: 0 0 10px;
  display: flex; align-items: baseline; gap: 8px;
}
.block h2 span { color: rgba(255, 255, 255, 0.22); letter-spacing: 0.1em; }
.block > .h3 {
  font-size: clamp(21px, 3.4vw, 27px); font-weight: 700;
  margin: 0 0 20px; letter-spacing: -0.005em; line-height: 1.35;
}

/* ---------- 为什么难：四张约束卡 ---------- */
.grid2 {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.card-c {
  padding: 20px 20px 22px;
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--card);
}
.card-c .no {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em;
  color: var(--txt-3); margin: 0 0 8px;
}
.card-c h3 {
  font-size: 16.5px; font-weight: 700; margin: 0 0 8px;
}
.card-c p { margin: 0; font-size: 14.5px; color: var(--txt-2); }
.card-c p b { color: var(--txt); font-weight: 600; }
.card-c.gold  h3 { color: var(--gold); }
.card-c.cyan  h3 { color: var(--cyan); }
.card-c.pink  h3 { color: var(--pink); }
.card-c.purple h3 { color: var(--purple); }

/* ---------- 过程：时间线 ---------- */
.tl { list-style: none; margin: 0; padding: 0 0 0 30px; position: relative; }
.tl::before {
  content: ''; position: absolute; left: 5px; top: 8px; bottom: 8px;
  width: 1px; background: linear-gradient(180deg, rgba(34,224,200,0.55), rgba(214,83,184,0.35), rgba(255,255,255,0.06));
}
.tl li { position: relative; padding-bottom: 26px; }
.tl li:last-child { padding-bottom: 0; }
.tl li::before {
  content: ''; position: absolute; left: -30px; top: 9px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--cyan);
  box-shadow: 0 0 10px rgba(34, 224, 200, 0.5);
}
.tl h3 { font-size: 16.5px; font-weight: 700; margin: 0 0 6px; }
.tl h3 em {
  font-style: normal; font-family: var(--mono);
  font-size: 12px; color: var(--txt-3); margin-right: 8px; letter-spacing: 0.1em;
}
.tl p { margin: 0; font-size: 14.5px; color: var(--txt-2); }
.tl p b { color: var(--txt); font-weight: 600; }

/* ---------- 结论：竖线金句组 ---------- */
.verdict {
  border-left: 2px solid rgba(34, 224, 200, 0.5);
  padding-left: 22px; display: grid; gap: 14px; max-width: 640px;
}
.verdict p { margin: 0; font-size: 15.5px; color: var(--txt-2); }
.verdict strong { color: var(--txt); font-weight: 600; }
.verdict em { font-style: normal; font-weight: 600; }
.verdict em.c { color: var(--cyan); }
.verdict em.p { color: var(--purple); }

/* ---------- 迁移：能力清单 ---------- */
.can {
  list-style: none; margin: 0; padding: 0; display: grid; gap: 10px;
}
.can li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--card);
  font-size: 14.5px; color: var(--txt-2);
}
.can li b { color: var(--txt); font-weight: 600; flex: none; min-width: 74px; }
.can li .k { font-family: var(--mono); font-size: 15px; color: var(--cyan); flex: none; }

/* ---------- 联系 CTA ---------- */
.cta-c { padding: 46px 0; border-top: 1px solid var(--line); text-align: center; }
.cta-c h2 {
  font-size: clamp(24px, 4.6vw, 36px); font-weight: 800;
  margin: 0 0 12px; letter-spacing: -0.01em;
}
.cta-c p.lead2 {
  font-size: 16px; color: var(--txt-2);
  margin: 0 auto 30px; max-width: 540px;
}
.mail-card {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 18px 28px;
  border: 1px solid rgba(34, 224, 200, 0.35); border-radius: 16px;
  background: linear-gradient(135deg, rgba(34,224,200,0.12), rgba(124,92,255,0.12));
  color: var(--txt); text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.mail-card:hover {
  transform: translateY(-3px);
  border-color: rgba(34, 224, 200, 0.6);
  box-shadow: 0 14px 34px -14px rgba(34, 224, 200, 0.5);
}
.mail-card .ic {
  width: 46px; height: 46px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.06); color: var(--cyan);
}
.mail-card .ic svg { width: 22px; height: 22px; }
.mail-card .tx { text-align: left; display: flex; flex-direction: column; }
.mail-card .tx b { font-size: 15.5px; font-weight: 600; }
.mail-card .tx em {
  font-style: normal; font-family: var(--mono);
  font-size: 12.5px; color: var(--txt-3); margin-top: 2px;
}

/* ---------- 页脚 ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 20px 0 26px;
  font-size: 13px; color: var(--txt-3);
}
.foot-line {
  max-width: 820px; margin: 0 auto; padding: 0 24px; text-align: center;
}
.foot-line .sep { margin: 0 10px; color: rgba(255, 255, 255, 0.18); }
/* 备案号须为可见可点的超链接，默认即带下划线（工信部要求可跳转至 beian.miit.gov.cn） */
.foot-line a {
  color: var(--txt-2);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  padding: 2px 1px;
}
.foot-line a:hover { color: var(--txt); }
.foot-line a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
  border-radius: 3px;
}

/* ============================================================
 * 移动端
 * ============================================================ */
@media (max-width: 720px) {
  main { padding: 6vh 0 4vh; }
  .nav-in { padding: 11px 18px; gap: 10px; }
  .brand em { display: none; }
  .nav-links { gap: 13px; }
  .nav-links a { font-size: 13px; }
  .nav-cta { padding: 5px 10px; }
  .grid2 { grid-template-columns: 1fr; gap: 12px; }
  .kv { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-c .lead-c { font-size: 16px; }
  .tl { padding-left: 26px; }
  .tl li::before { left: -26px; }
  .verdict { padding-left: 16px; }
  .verdict p { font-size: 14.5px; }
  .can li { flex-direction: column; gap: 4px; }
  .can li b { min-width: 0; }
  .mail-card { padding: 16px 20px; }
}

/* ============================================================
 * 打印：这页会当简历附件导出 PDF，打印时去掉背景和导航
 * ============================================================ */
@media print {
  .sky, .nav { display: none !important; }
  body { background: #fff; color: #111; }
  .wrap { max-width: none; }
  .hero-c h1, .block > .h3, .card-c h3, .tl h3, .cta-c h2 { color: #111; }
  .hero-c .lead-c, .card-c p, .tl p, .verdict p, .can li, .cta-c p.lead2 { color: #333; }
  .card-c, .can li, .kv > div, .mail-card { border-color: #bbb; background: #f6f7f9; }
  .kv dt, .tl h3 em, .foot-line { color: #333; }
  .kv-note { color: #444; }
  .kv-note b, .card-c p b, .tl p b { color: #111; }
  .block { break-inside: avoid; }
}

/* ============================================================
 * 降低动效偏好
 * ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .mail-card { transition: none; }
}