/* FoMind 落地页。配色取自 App 图标与 App 内 Palette（FoMind/Shared/Theme/Palette.swift）。 */

:root {
  --night: #0E2350;
  --amber: #F5B547;
  --bg: #F4F0E8;
  --bg-deep: #ECE5D8;
  --text: #14213D;
  --text-2: #555B70;
  --interactive: #1B3A8C;
  --figure: #9A5B06;
  --card: rgba(255, 255, 255, 0.78);
  --card-border: rgba(14, 35, 80, 0.08);
  --glow: rgba(245, 181, 71, 0.28);
  --cta-bg: #0E2350;
  --cta-text: #FFE2A6;
  --shadow: 0 24px 60px -24px rgba(14, 35, 80, 0.35);
  --radius: 24px;
  --max: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08142E;
    --bg-deep: #0E2350;
    --text: #F4EFE6;
    --text-2: #A9B3C9;
    --interactive: #F5B547;
    --figure: #FFC867;
    --card: rgba(255, 255, 255, 0.06);
    --card-border: rgba(255, 255, 255, 0.10);
    --glow: rgba(245, 181, 71, 0.22);
    --cta-bg: #F5B547;
    --cta-text: #0E2350;
    --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  /* 右上角琥珀光晕（呼应图标的发光），做成背景而不是固定元素，避免撑宽页面。 */
  background:
    radial-gradient(min(80vw, 900px) min(70vh, 700px) at 92% -8%, var(--glow), transparent 70%) no-repeat,
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* 中文内容：苹方排最前。iOS Safari 选中 -apple-system 后遇到中文不会回退，会显示成缺字方框。 */
:lang(zh) {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

img { max-width: 100%; display: block; }

a { color: var(--interactive); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin-inline: auto; padding-inline: 24px; }

/* 顶栏 */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.nav-links { display: flex; gap: 22px; font-size: 15px; align-items: center; }
.nav-links a { color: var(--text-2); }
.nav-links .lang {
  color: var(--text);
  border: 1px solid var(--card-border);
  background: var(--card);
  padding: 4px 12px;
  border-radius: 999px;
}

/* 首屏 */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding-block: 48px 72px;
}
.hero-icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  box-shadow: 0 12px 40px -8px rgba(245, 181, 71, 0.55);
  margin-bottom: 28px;
}
.eyebrow {
  color: var(--figure);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  margin: 0 0 12px;
}
h1 {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  font-weight: 800;
}
h1 em { font-style: normal; color: var(--figure); }
.lede { font-size: 19px; color: var(--text-2); margin: 0 0 32px; max-width: 34em; }

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--cta-bg);
  color: var(--cta-text);
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 16px;
}
.cta:hover { text-decoration: none; opacity: 0.92; }
.cta svg { width: 20px; height: 20px; fill: currentColor; }
.cta[aria-disabled="true"] { cursor: default; }
.cta-note { color: var(--text-2); font-size: 14px; }

.hero-phones { position: relative; height: 620px; }
.hero-phones .phone { position: absolute; width: 270px; }
.hero-phones .phone:first-child { left: 4%; top: 40px; transform: rotate(-4deg); }
.hero-phones .phone:last-child { right: 4%; top: 0; transform: rotate(3deg); }

.phone {
  border-radius: 40px;
  padding: 8px;
  background: #0b1630;
  box-shadow: var(--shadow);
}
.phone img { border-radius: 32px; width: 100%; height: auto; aspect-ratio: 552 / 1200; }

/* 通用区块 */
section { padding-block: 72px; }
.section-head { max-width: 640px; margin-bottom: 40px; }
h2 {
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
  font-weight: 800;
}
.section-head p { color: var(--text-2); margin: 0; font-size: 18px; }

/* 三步闭环 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.step {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px 24px 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--amber);
  color: var(--night);
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 14px;
}
.step h3 { margin: 0 0 8px; font-size: 21px; }
.step p { margin: 0 0 24px; color: var(--text-2); font-size: 16px; }
.step .phone { margin: auto auto -120px; width: 78%; }

/* 特性网格 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 26px;
}
.feature .ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(245, 181, 71, 0.18);
  margin-bottom: 14px;
}
.feature .ico svg { width: 24px; height: 24px; stroke: var(--figure); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.feature h3 { margin: 0 0 6px; font-size: 19px; }
.feature p { margin: 0; color: var(--text-2); font-size: 16px; }

/* 课程 */
.learn { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.learn-phones { display: flex; gap: 20px; justify-content: center; }
.learn-phones .phone { width: 46%; max-width: 260px; }
.learn-phones .phone:last-child { margin-top: 56px; }
.modules { list-style: none; padding: 0; margin: 24px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; }
.modules li { display: flex; gap: 10px; font-size: 16px; }
.modules li b { color: var(--figure); font-variant-numeric: tabular-nums; min-width: 1.2em; }
.stat-row { display: flex; gap: 36px; margin-top: 28px; }
.stat b { display: block; font-size: 34px; line-height: 1.1; color: var(--figure); font-variant-numeric: tabular-nums; }
.stat span { font-size: 14px; color: var(--text-2); }

/* Brier 说明 */
.brier {
  background: var(--night);
  color: #F4EFE6;
  border-radius: 32px;
  padding: 56px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.brier::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  background: radial-gradient(closest-side, rgba(245, 181, 71, 0.35), transparent);
}
.brier h2 { color: #F4EFE6; }
.brier p { color: #C9D1E3; margin: 0 0 14px; }
.formula {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  padding: 24px;
  font-size: 15px;
}
.formula .big { font-size: 22px; font-weight: 700; color: #FFC867; margin-bottom: 14px; }
.formula .big:lang(en) { font-family: ui-rounded, -apple-system, sans-serif; }
.formula table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.formula td { padding: 8px 0; border-top: 1px solid rgba(255, 255, 255, 0.1); color: #E7EBF4; }
.formula td:last-child { text-align: right; color: #FFC867; font-weight: 600; }

/* 隐私 */
.privacy-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* FAQ */
.faq { max-width: 760px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 18px 22px;
  margin-bottom: 12px;
}
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--figure); font-weight: 700; font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 12px 0 0; color: var(--text-2); }

/* 收尾 CTA */
.closing { text-align: center; padding-block: 96px; }
.closing img { width: 96px; height: 96px; border-radius: 22px; margin: 0 auto 24px; box-shadow: 0 12px 40px -8px rgba(245, 181, 71, 0.55); }
.closing p { color: var(--text-2); margin: 0 auto 28px; max-width: 32em; }
.closing .cta-row { justify-content: center; }

footer {
  border-top: 1px solid var(--card-border);
  padding: 32px 0 48px;
  font-size: 14px;
  color: var(--text-2);
}
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--text-2); }

/* 文档页（隐私、支持） */
.doc { max-width: 760px; padding-block: 32px 80px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); }
.doc h2 { font-size: 22px; margin: 40px 0 10px; }
.doc p, .doc li { color: var(--text-2); }
.doc strong { color: var(--text); }
.doc .meta { color: var(--text-2); font-size: 15px; }
.doc .card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 24px 0;
}
.doc .card p { margin: 0; }

/* 课程页（scripts/build_learn.py 生成） */
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: var(--text-2); margin-bottom: 18px; }
.crumbs a { color: var(--text-2); }
.lesson h1 { margin-bottom: 10px; }
.lesson-body { font-size: 18px; line-height: 1.8; }
.lesson-body p, .lesson-body li { color: var(--text); }
.lesson-body h2 { font-size: 24px; margin: 40px 0 12px; }
.lesson-body ul { padding-left: 1.2em; }
.lesson-body li { margin-bottom: 6px; }
.lesson-body li::marker { color: var(--amber); }
.lesson-body strong { color: var(--figure); }
.callout {
  border-left: 3px solid var(--amber);
  background: rgba(245, 181, 71, 0.12);
  border-radius: 14px;
  padding: 14px 18px;
  margin: 24px 0;
}
.callout p { margin: 0; font-weight: 600; }
.demo-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px dashed var(--hairline, #B49A72);
  border-radius: 16px;
  padding: 14px 18px;
  margin: 24px 0;
  background: var(--card);
}
.demo-box p { margin: 0; font-size: 15px; color: var(--text-2); }
.demo-ico { color: var(--amber); font-size: 18px; line-height: 1.5; }
.doc .card h2 { margin-top: 0; font-size: 20px; }
.keypoints ul { margin: 0; padding-left: 1.2em; }
.keypoints li { margin-bottom: 6px; }
.keypoints li::marker { color: var(--amber); }
.app-cta { display: flex; gap: 18px; align-items: flex-start; }
.app-cta img { border-radius: 13px; flex-shrink: 0; box-shadow: 0 8px 24px -6px rgba(245, 181, 71, 0.55); }
.app-cta ul { margin: 0 0 10px; padding-left: 1.2em; }
.app-cta p { margin: 8px 0 0; }
.muted { color: var(--text-2); font-size: 14px; margin-left: 8px; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 40px; }
.pager a {
  display: block;
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--card-border);
  color: var(--text);
  font-weight: 600;
}
.pager a:hover { text-decoration: none; border-color: var(--amber); }
.pager a small { display: block; color: var(--text-2); font-weight: 400; font-size: 13px; margin-bottom: 4px; }
.pager .next { text-align: right; }
.learn-index .lede { font-size: 19px; color: var(--text-2); }
.module { margin-top: 44px; }
.module h2 { display: flex; align-items: baseline; gap: 12px; font-size: 24px; margin: 0 0 6px; }
.module h2 .num, .lesson-list .num { color: var(--figure); font-variant-numeric: tabular-nums; }
.module > p { margin: 0 0 14px; }
.lesson-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.lesson-list a {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 18px;
  border-radius: 16px;
  background: var(--card);
  border: 1px solid var(--card-border);
  color: var(--text);
}
.lesson-list a:hover { text-decoration: none; border-color: var(--amber); }
.lesson-list .num { font-weight: 700; min-width: 2em; }
.lesson-list .t { flex: 1; font-weight: 600; }
.lesson-list .min { color: var(--text-2); font-size: 14px; white-space: nowrap; }
@media (max-width: 640px) {
  .lesson-body { font-size: 17px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .app-cta { flex-direction: column; }
  .lesson-list .min { display: none; }
}

/* Cookie 同意横幅（由 assets/consent.js 插入） */
.consent {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  width: min(720px, calc(100% - 32px));
  z-index: 10;
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  backdrop-filter: blur(20px) saturate(1.4);
  font-size: 14px;
  line-height: 1.5;
}
.consent p { margin: 0; color: var(--text-2); flex: 1; }
.consent-actions { display: flex; gap: 8px; flex-shrink: 0; }
.consent-btn {
  font: inherit;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.consent-btn.primary { background: var(--cta-bg); color: var(--cta-text); border-color: transparent; }
.link-button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
.link-button:hover { text-decoration: underline; }

/* 响应式 */
@media (max-width: 960px) {
  .hero, .learn, .brier { grid-template-columns: 1fr; }
  .hero { padding-top: 24px; }
  .hero-phones { height: 520px; max-width: 460px; margin: 0 auto; width: 100%; }
  .hero-phones .phone { width: 220px; }
  .steps, .features { grid-template-columns: 1fr 1fr; }
  .privacy-grid { grid-template-columns: 1fr 1fr; }
  .brier { padding: 40px 28px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { padding-inline: 16px; }
  .nav-links a:not(.lang) { display: none; }
  .hero-phones { height: 420px; }
  .hero-phones .phone { width: 180px; }
  .steps, .features, .privacy-grid { grid-template-columns: 1fr; }
  .step .phone { width: 64%; }
  .modules { grid-template-columns: 1fr; }
  section { padding-block: 56px; }
  .stat-row { gap: 24px; }
  .consent { flex-direction: column; align-items: stretch; }
  .consent-actions .consent-btn { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* 网格子项允许收缩，避免窄屏横向溢出。 */
.hero > *, .learn > *, .brier > *, .steps > *, .features > *, .privacy-grid > * { min-width: 0; }