/* style.css — 在呼吸之间找回自己（首页 + 全站基础样式）
   设计基准宽度 1440，内容容器 1200；颜色与字号全部走变量，内页复用同一套。 */

:root {
  /* 颜色 */
  --bg: #f7f2e7;
  --bg-card: #fdfaf1;
  --bg-tint: #e8efe2;
  --ink: #26302b;
  --ink-deep: #1c3527;
  --muted: #6f7a6e;
  --line: #e3dccb;
  --line-strong: #d5cdb8;
  --accent: #2f5b3e;
  --accent-deep: #1d3b2a;
  --accent-soft: #dbe6d7;
  --clay: #b5714d;
  --footer-bg: #335339;
  --paper: #f2efe3;

  /* 字体 */
  --font-serif: 'Songti SC',SimSun,'Noto Serif SC',Georgia,serif;
  --font-sans: 'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;

  /* 字号阶 */
  --fs-1: 13px;
  --fs-2: 15px;
  --fs-3: 17px;
  --fs-4: 20px;
  --fs-5: 26px;
  --fs-6: 34px;
  --fs-7: 44px;
  --fs-8: 64px;

  /* 尺寸 */
  --wrap: 1272px;
  --gutter: 36px;
  --space-1: 8px;
  --space-2: 14px;
  --space-3: 24px;
  --space-4: 36px;
  --space-5: 56px;
  --space-6: 64px;
  --r-1: 4px;
  --r-2: 999px;
  --line-1: 1px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

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

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

body {
  margin: 0;
  background-color: var(--bg);
  background-image: linear-gradient(180deg,
    #f7f2ea 0%,
    #faf7f3 35%,
    #f9f5f0 52%,
    #f6f2ec 66%,
    #f2f0e7 81%,
    #eeeee3 100%);
  background-repeat: no-repeat;
  background-size: 100% 1880px;
  color: var(--ink);
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: var(--fs-3);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; color: var(--ink-deep); line-height: 1.25; }

.wrap {
  width: min(var(--wrap), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

:focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 3px;
  border-radius: var(--r-1);
}

/* ------------------------------------------------------------------ header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: var(--line-1) solid transparent;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--bg) 97%, transparent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 88px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { color: var(--accent); display: inline-flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-family: var(--font-serif);
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--ink-deep);
  letter-spacing: .02em;
}
.brand-sub {
  margin-top: 3px;
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--muted);
}
.main-nav { display: flex; align-items: center; gap: 30px; }
.main-nav a {
  position: relative;
  font-size: var(--fs-2);
  color: var(--ink);
  padding-block: 6px;
  transition: color .18s var(--ease);
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s var(--ease);
}
.main-nav a:hover { color: var(--accent); }
.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after { transform: scaleX(1); }
.main-nav a[aria-current="page"] { color: var(--accent-deep); font-weight: 500; }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: var(--line-1) solid var(--line-strong);
  border-radius: var(--r-2);
  cursor: pointer;
}
.nav-bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink-deep);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* -------------------------------------------------------------------- hero */
.hero { padding: 0 0 30px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 659px) minmax(0, 1fr);
  align-items: start;
  gap: 0;
}
.hero-copy { padding-top: 56px; padding-right: 34px; }
.eyebrow {
  font-size: var(--fs-5);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: .04em;
}
.hero h1 {
  margin-top: var(--space-2);
  font-size: 64px;
  letter-spacing: 0;
  line-height: 1.15;
}
.hero-lead {
  margin-top: var(--space-3);
  max-width: 34em;
  font-size: var(--fs-3);
  line-height: 2;
  color: var(--muted);
}
.hero-actions {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 30px;
  font-size: var(--fs-2);
  letter-spacing: .04em;
  border-radius: var(--r-2);
  border: var(--line-1) solid transparent;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.btn-solid { background: var(--accent); color: var(--bg-card); }
.btn-solid:hover { background: var(--accent-deep); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.hero-media {
  position: relative;
  margin-right: calc(-1 * clamp(36px, (100vw - 1272px) / 2, 120px));
  border-radius: var(--r-1) 0 0 var(--r-1);
  overflow: hidden;
}
.hero-media img {
  width: 100%;
  height: 471px;
  object-fit: cover;
}

/* ------------------------------------------------------------------- facts */
.facts {
  margin-top: 0;
  border-block: var(--line-1) solid var(--line);
  background: color-mix(in srgb, var(--bg-card) 60%, var(--bg));
}
.facts-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 30px 0;
}
.fact {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding-inline: var(--space-3);
}
.fact + .fact { border-left: var(--line-1) solid var(--line); }
.fact-icon { color: var(--accent); display: inline-flex; }
.fact-text { display: flex; align-items: baseline; gap: 8px; }
.fact-num {
  font-family: var(--font-serif);
  font-size: var(--fs-7);
  font-weight: 600;
  color: var(--ink-deep);
  line-height: 1;
}
.fact-label { font-size: var(--fs-2); color: var(--muted); letter-spacing: .04em; }

/* ------------------------------------------------------------------ 通用节 */
.section { padding-top: 64px; }
.topics { padding-top: 64px; }
.featured { padding-top: 56px; }
.featured .col-head { margin-bottom: 16px; }
.path { padding-top: 50px; }
.col-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: 22px;
}
.col-head h2 {
  font-size: var(--fs-6);
  padding-left: 16px;
  border-left: 4px solid var(--accent);
  line-height: 1.1;
}
.col-head-split { justify-content: space-between; align-items: center; }
.col-more {
  font-size: var(--fs-2);
  color: var(--accent);
  border-bottom: var(--line-1) solid var(--accent-soft);
  padding-bottom: 2px;
  transition: border-color .2s var(--ease);
}
.col-more:hover { border-bottom-color: var(--accent); }

/* ------------------------------------------------------------------ topics */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.topic-card {
  display: grid;
  grid-template-columns: 104px 1fr 30px;
  align-items: center;
  gap: 18px;
  padding: 12px;
  background: var(--bg-card);
  border: var(--line-1) solid var(--line);
  border-radius: var(--r-1);
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}
.topic-card:hover {
  border-color: var(--line-strong);
  background: #fffdf6;
  transform: translateY(-2px);
}
.topic-media { display: block; border-radius: var(--r-1); overflow: hidden; }
.topic-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.topic-body { display: flex; flex-direction: column; gap: 6px; }
.topic-name {
  font-family: var(--font-serif);
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--ink-deep);
}
.topic-desc { font-size: 13.5px; line-height: 1.65; color: var(--muted); }
.topic-arrow {
  position: relative;
  width: 28px;
  height: 28px;
  border: var(--line-1) solid var(--line-strong);
  border-radius: 50%;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}
.topic-arrow::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  border-top: 1.4px solid var(--accent);
  border-right: 1.4px solid var(--accent);
  transform: translate(-60%, -50%) rotate(45deg);
}
.topic-card:hover .topic-arrow { background: var(--accent-soft); border-color: var(--accent-soft); }

/* ---------------------------------------------------------------- featured */
.stream-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.stream-card {
  position: relative;
  display: block;
  border-radius: var(--r-1);
  overflow: hidden;
  isolation: isolate;
}
.stream-card img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.stream-card:hover img { transform: scale(1.03); }
.stream-body {
  position: absolute;
  inset: 14px auto auto 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  max-width: 60%;
  padding: 11px 14px 13px;
  text-align: left;
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  border-radius: var(--r-1);
  backdrop-filter: blur(2px);
}
.stream-name {
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: var(--fs-2);
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--paper);
  background: var(--accent);
  border-radius: var(--r-2);
  padding: 5px 14px;
}
.stream-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
}

/* -------------------------------------------------------------------- path */
.path-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-5);
  align-items: start;
}
.path-head h2 {
  font-size: var(--fs-6);
  padding-left: 16px;
  border-left: 4px solid var(--accent);
  line-height: 1.1;
}
.path-steps {
  padding-top: 60px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  counter-reset: step;
}
.path-step { position: relative; display: flex; flex-direction: column; gap: 10px; counter-increment: step; }
.path-step::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 56px;
  right: -24px;
  height: 1px;
  background: var(--line-strong);
}
.path-step:last-child::before { display: none; }
.step-no::before { content: counter(step); }
.step-no {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: var(--line-1) solid var(--accent);
  border-radius: 50%;
  font-family: var(--font-serif);
  font-size: var(--fs-4);
  color: var(--accent);
  background: var(--bg);
}
.path-step h3 { font-size: var(--fs-4); }
.path-step p { font-size: var(--fs-2); line-height: 1.85; color: var(--muted); }

/* ------------------------------------------------------------- note-block */
.note-block {
  margin-top: 30px;
  padding: 58px 0;
  background: var(--bg-tint);
  border-block: var(--line-1) solid color-mix(in srgb, var(--accent) 12%, transparent);
}
.note-inner {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: var(--space-5);
  align-items: start;
}
.note-label {
  font-size: var(--fs-1);
  letter-spacing: .3em;
  color: var(--accent);
  padding-top: 6px;
  border-top: 2px solid var(--accent);
  display: inline-block;
  writing-mode: vertical-rl;
  border-top: none;
  border-left: 2px solid var(--accent);
  padding: 2px 0 0 12px;
  min-height: 96px;
}
.note-body { max-width: 46em; }
.note-body p { font-size: var(--fs-3); line-height: 2.1; color: var(--ink); }

/* ------------------------------------------------------------------ footer */
.site-footer {
  margin-top: 0;
  background: var(--footer-bg);
  color: var(--paper);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr 1.5fr;
  gap: var(--space-5);
  padding: 40px 0 26px;
}
.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.footer-name { font-family: var(--font-serif); font-size: var(--fs-4); font-weight: 600; }
.footer-sub { font-size: 11px; letter-spacing: .34em; color: color-mix(in srgb, var(--paper) 62%, transparent); }
.footer-title {
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: var(--fs-1);
  letter-spacing: .2em;
  color: color-mix(in srgb, var(--paper) 62%, transparent);
  margin-bottom: var(--space-2);
}
.footer-links { display: grid; grid-template-columns: repeat(3, auto); gap: 8px 24px; justify-content: start; }
.footer-links a { font-size: var(--fs-2); color: var(--paper); opacity: .9; transition: opacity .2s var(--ease); }
.footer-links a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.footer-note { font-size: var(--fs-1); line-height: 1.9; color: color-mix(in srgb, var(--paper) 78%, transparent); max-width: 34em; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 14px 0 16px;
  border-top: var(--line-1) solid color-mix(in srgb, var(--paper) 16%, transparent);
  font-size: var(--fs-1);
  color: color-mix(in srgb, var(--paper) 62%, transparent);
}
.to-top { color: color-mix(in srgb, var(--paper) 82%, transparent); }
.to-top:hover { color: var(--paper); text-decoration: underline; text-underline-offset: 4px; }

/* --------------------------------------------------------------- responsive */
@media (max-width: 1100px) {
  .hero { padding-top: var(--space-5); }
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .hero-copy { padding-right: 0; }
  .hero-media { margin-right: 0; border-radius: var(--r-1); }
  .hero-media img { height: auto; aspect-ratio: 496 / 335; }
  .hero h1 { font-size: var(--fs-7); }
  .eyebrow { font-size: var(--fs-4); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .stream-grid { grid-template-columns: repeat(2, 1fr); }
  .stream-body {
    position: static;
    inset: auto;
    max-width: none;
    padding: 16px 18px 18px;
    background: var(--bg-card);
    border: var(--line-1) solid var(--line);
    border-top: none;
    border-radius: 0 0 var(--r-1) var(--r-1);
    backdrop-filter: none;
  }
  .stream-card { background: var(--bg-card); border-radius: var(--r-1); }
  .stream-card img { border-radius: var(--r-1) var(--r-1) 0 0; aspect-ratio: 16 / 10; }
  .path-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .path-steps { padding-top: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col:last-of-type { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 88px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) var(--gutter) var(--space-4);
    background: var(--bg);
    border-bottom: var(--line-1) solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  }
  .main-nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .main-nav a { padding-block: 14px; border-bottom: var(--line-1) solid var(--line); font-size: var(--fs-3); }
  .main-nav a::after { display: none; }
  .main-nav a[aria-current="page"] { color: var(--accent); }
  .nav-toggle { display: inline-flex; }
  .facts-inner { grid-template-columns: 1fr; gap: 0; padding: 8px 0; }
  .fact { justify-content: flex-start; padding-block: 16px; }
  .fact + .fact { border-left: none; border-top: var(--line-1) solid var(--line); }
  .note-inner { grid-template-columns: 1fr; gap: var(--space-3); }
  .note-label { writing-mode: horizontal-tb; min-height: 0; border-left: 2px solid var(--accent); padding: 0 0 0 12px; }
  .path-steps { grid-template-columns: 1fr; gap: var(--space-4); }
  .path-step::before { display: none; }
}

@media (max-width: 640px) {
  :root { --gutter: 20px; --space-6: 56px; --space-5: 40px; --fs-8: 40px; --fs-7: 34px; --fs-6: 27px; }
  body { font-size: var(--fs-2); }
  .header-inner { min-height: 72px; }
  .brand-name { font-size: var(--fs-2); }
  .brand-sub { letter-spacing: .24em; }
  .main-nav { inset: 72px 0 auto 0; }
  .hero-lead { font-size: var(--fs-2); line-height: 1.95; }
  .hero-actions { gap: 12px; }
  .btn { min-height: 46px; padding: 0 22px; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { grid-template-columns: 84px 1fr 28px; gap: 14px; }
  .stream-grid { grid-template-columns: 1fr; }
  .stream-card img { aspect-ratio: 3 / 2; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer-links { grid-template-columns: repeat(2, auto); }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 6px; }
  .col-head h2 { font-size: var(--fs-5); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .topic-card:hover { transform: none; }
  .stream-card:hover img { transform: none; }
}