/* ============================================================
   宇生医疗 YUSHINE MEDICAL — 全站样式
   色板：深墨棕 #2E222B / 曜金 #C9A24B / 琥珀光 #D4AF6A
        心珀红 #A85460（仅教育板块）/ 米白 #F7F1EA / 雾灰 #8C767C
   ============================================================ */
:root {
  --ink: #2E222B;
  --ink-deep: #231A21;
  --gold: #C9A24B;
  --amber: #D4AF6A;
  --ruby: #A85460;
  --cream: #F7F1EA;
  --cream-soft: #FBF7F2;
  --mist: #8C767C;
  --line: rgba(46, 34, 43, 0.12);
  --line-gold: rgba(201, 162, 75, 0.35);
  --serif-cn: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
  --serif-en: "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  background: var(--cream);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.02em;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: var(--gold); color: #fff; }

/* ---------- 排版体系 ---------- */
.container { width: min(1120px, 90%); margin: 0 auto; }
h1, h2, h3, .serif { font-family: var(--serif-cn); font-weight: 600; }
.en { font-family: var(--serif-en); letter-spacing: 0.14em; }

.section { padding: clamp(64px, 10vw, 120px) 0; }
.section-head { text-align: center; margin-bottom: clamp(40px, 6vw, 72px); }
.section-head .kicker {
  font-family: var(--serif-en);
  font-size: 13px; letter-spacing: 0.35em; text-transform: uppercase;
  color: var(--gold); display: block; margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(26px, 4vw, 38px); letter-spacing: 0.08em; }
.section-head .sub { color: var(--mist); margin-top: 12px; font-size: 15px; }
.rule {
  width: 44px; height: 1px; background: var(--gold);
  margin: 22px auto 0; position: relative;
}
.rule::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--gold); transform: translate(-50%, -50%);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background 0.35s, box-shadow 0.35s;
}
.site-header .bar {
  width: min(1240px, 94%); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand svg { width: 40px; height: 40px; flex: none; }
.brand .name { line-height: 1.2; }
.brand .cn { font-family: var(--serif-cn); font-size: 19px; letter-spacing: 0.2em; display: block; }
.brand .en { font-size: 10px; letter-spacing: 0.3em; opacity: 0.75; display: block; }

.main-nav ul { display: flex; gap: clamp(18px, 3vw, 38px); }
.main-nav a {
  font-size: 15px; letter-spacing: 0.12em; position: relative; padding: 6px 0;
  opacity: 0.88; transition: opacity 0.25s;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--gold); transition: width 0.3s;
}
.main-nav a:hover, .main-nav a.active { opacity: 1; }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }

/* 主题变体：深色页（首页）头透明金字，浅色页头米白 */
.site-header.on-dark { color: var(--cream); }
.site-header.on-light { color: var(--ink); background: rgba(247, 241, 234, 0.92); backdrop-filter: blur(10px); box-shadow: 0 1px 0 var(--line); }
.site-header.scrolled.on-dark { background: rgba(35, 26, 33, 0.9); backdrop-filter: blur(10px); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 1.5px; background: currentColor; margin: 6px 0; transition: 0.3s; }

/* ---------- 首页 Hero ---------- */
.hero {
  min-height: 100vh; min-height: 100svh; position: relative; overflow: hidden;
  background:
    radial-gradient(ellipse 90% 60% at 70% 20%, rgba(201, 162, 75, 0.10), transparent 60%),
    radial-gradient(ellipse 70% 50% at 20% 85%, rgba(168, 84, 96, 0.07), transparent 65%),
    linear-gradient(160deg, #332631 0%, var(--ink) 45%, var(--ink-deep) 100%);
  color: var(--cream);
  display: flex; align-items: center;
}
.hero-rings { position: absolute; right: -12vmax; top: 50%; transform: translateY(-50%); width: 78vmax; height: 78vmax; opacity: 0.9; pointer-events: none; }
.hero-inner { position: relative; z-index: 2; width: min(1240px, 94%); margin: 0 auto; padding-top: 90px; }
.hero-sym { width: clamp(96px, 12vw, 140px); margin-bottom: 34px; animation: floaty 7s ease-in-out infinite; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.hero .en-kicker { font-family: var(--serif-en); letter-spacing: 0.5em; font-size: clamp(12px, 1.4vw, 15px); color: var(--amber); text-transform: uppercase; }
.hero h1 { font-size: clamp(38px, 6.5vw, 68px); letter-spacing: 0.14em; margin: 18px 0 8px; }
.hero .en-title { font-family: var(--serif-en); font-size: clamp(17px, 2.4vw, 26px); letter-spacing: 0.42em; color: var(--amber); }
.hero .slogan {
  margin-top: 30px; font-family: var(--serif-cn); font-size: clamp(17px, 2.2vw, 22px);
  color: var(--cream); opacity: 0.92; letter-spacing: 0.1em;
}
.hero .slogan .dot { color: var(--gold); margin: 0 10px; }
.hero p.lede { margin-top: 18px; max-width: 560px; color: rgba(247, 241, 234, 0.72); font-size: 15px; }
.hero-cta { margin-top: 44px; display: flex; gap: 18px; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 13px 34px; font-size: 14px; letter-spacing: 0.2em;
  border: 1px solid var(--gold); transition: 0.3s; text-align: center;
}
.btn-solid { background: var(--gold); color: var(--ink-deep); }
.btn-solid:hover { background: var(--amber); border-color: var(--amber); }
.btn-ghost { color: var(--amber); }
.btn-ghost:hover { background: rgba(201, 162, 75, 0.12); }
.btn-dark { border-color: var(--ink); color: var(--ink); }
.btn-dark:hover { background: var(--ink); color: var(--cream); }

/* ---------- 定位宣言 ---------- */
.manifesto { background: var(--cream); }
.manifesto-grid { display: grid; grid-template-columns: 1fr; gap: 48px; align-items: center; }
.manifesto blockquote {
  font-family: var(--serif-cn); font-size: clamp(22px, 3.4vw, 34px);
  line-height: 2; letter-spacing: 0.08em;
}
.manifesto blockquote em { font-style: normal; color: var(--gold); }
.manifesto .note { color: var(--mist); margin-top: 26px; max-width: 620px; font-size: 15px; }

/* ---------- 渠道数据 ---------- */
.stats { background: var(--cream-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; text-align: center; }
.stat .num { font-family: var(--serif-en); font-size: clamp(44px, 6vw, 68px); color: var(--ink); line-height: 1.1; }
.stat .num sup { font-size: 0.4em; color: var(--gold); font-family: var(--serif-cn); letter-spacing: 0.1em; margin-left: 4px; }
.stat .label { margin-top: 8px; color: var(--mist); font-size: 14px; letter-spacing: 0.15em; }
.stat + .stat { border-left: 1px solid var(--line); }

/* ---------- 材料卡片 ---------- */
.materials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 20px; }
.m-card {
  background: #fff; border: 1px solid var(--line); padding: 34px 26px 30px;
  position: relative; transition: transform 0.35s, box-shadow 0.35s;
}
.m-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(46, 34, 43, 0.10); }
.m-card .en-name { font-family: var(--serif-en); font-size: 13px; letter-spacing: 0.22em; color: var(--gold); text-transform: uppercase; }
.m-card h3 { font-size: 21px; margin: 10px 0 4px; letter-spacing: 0.1em; }
.m-card .tag { font-size: 12px; color: var(--mist); letter-spacing: 0.08em; }
.m-card p { margin-top: 14px; font-size: 13.5px; color: #5c4f55; line-height: 1.9; }
.m-card::before {
  content: ""; position: absolute; top: 0; left: 26px; width: 26px; height: 2px; background: var(--gold);
}

/* ---------- 学苑双栏 ---------- */
.academy-band { background: linear-gradient(155deg, #34273200, #34273200), var(--cream); }
.academy-grid { display: grid; grid-template-columns: 1fr; gap: 26px; }
.a-card {
  padding: clamp(34px, 5vw, 54px); border: 1px solid var(--line); background: #fff;
  position: relative; overflow: hidden; transition: 0.35s;
}
.a-card:hover { transform: translateY(-5px); box-shadow: 0 20px 44px rgba(46, 34, 43, 0.10); }
.a-card.b-side { border-top: 3px solid var(--gold); }
.a-card.c-side { border-top: 3px solid var(--ruby); }
.a-card .aud { font-size: 12px; letter-spacing: 0.3em; color: var(--mist); text-transform: uppercase; }
.a-card.b-side .aud::before { content: "B端 · "; color: var(--gold); }
.a-card.c-side .aud::before { content: "C端 · "; color: var(--ruby); }
.a-card h3 { font-size: clamp(24px, 3vw, 30px); margin: 12px 0 6px; letter-spacing: 0.12em; }
.a-card .en-sub { font-family: var(--serif-en); color: var(--gold); font-size: 13px; letter-spacing: 0.24em; }
.a-card.c-side .en-sub { color: var(--ruby); }
.a-card p { margin-top: 16px; color: #5c4f55; font-size: 14.5px; }
.a-card .link-more { display: inline-block; margin-top: 22px; font-size: 13.5px; letter-spacing: 0.2em; color: var(--ink); border-bottom: 1px solid var(--gold); padding-bottom: 4px; }

/* ---------- 金句 ---------- */
.quote-band { background: radial-gradient(ellipse 62% 75% at 50% 46%,rgba(201,162,75,.07),transparent 70%),linear-gradient(180deg,var(--cream) 0%,#FBF7F2 34%,#FBF7F2 66%,var(--cream) 100%); color: var(--ink); text-align: center; position: relative; overflow: hidden; border-top: 1px solid var(--line-gold); border-bottom: 1px solid var(--line-gold); }
.quote-band .bg-ring { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 640px; opacity: 0.24; pointer-events: none; }
.quote-band blockquote {
  position: relative; font-family: var(--serif-cn);
  font-size: clamp(20px, 3.2vw, 30px); letter-spacing: 0.14em; line-height: 2.1;
}
.quote-band cite { display: block; margin-top: 24px; font-style: normal; font-size: 13px; letter-spacing: 0.4em; color: var(--gold); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item button {
  width: 100%; background: none; border: 0; text-align: left; cursor: pointer;
  padding: 22px 40px 22px 0; font-family: var(--serif-cn); font-size: 16.5px;
  letter-spacing: 0.05em; color: var(--ink); position: relative; line-height: 1.6;
}
.faq-item button::after {
  content: "+"; position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  color: var(--gold); font-size: 20px; font-family: var(--sans); transition: 0.3s;
}
.faq-item.open button::after { transform: translateY(-50%) rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-a .inner { padding: 0 0 24px; color: #5c4f55; font-size: 14.5px; }
.faq-a .by { display: block; margin-top: 10px; font-size: 12px; color: var(--mist); letter-spacing: 0.12em; }

/* ---------- 页面内页通用 ---------- */
.page-hero {
  padding: 150px 0 70px; background:
    radial-gradient(ellipse 80% 100% at 80% 0%, rgba(201, 162, 75, 0.10), transparent 55%),
    linear-gradient(170deg, #33262F, var(--ink-deep));
  color: var(--cream);
}
.page-hero .kicker { font-family: var(--serif-en); letter-spacing: 0.4em; font-size: 12px; color: var(--amber); text-transform: uppercase; }
.page-hero h1 { font-size: clamp(30px, 4.6vw, 46px); letter-spacing: 0.14em; margin-top: 14px; }
.page-hero .en-sub { font-family: var(--serif-en); color: rgba(212, 175, 106, 0.85); letter-spacing: 0.3em; margin-top: 10px; font-size: 15px; }
.breadcrumb { margin-top: 20px; font-size: 12.5px; color: rgba(247, 241, 234, 0.55); letter-spacing: 0.1em; }
.breadcrumb a:hover { color: var(--amber); }

/* ---------- 关于页 ---------- */
.story-wrap { max-width: 760px; margin: 0 auto; }
.story-wrap p { margin-bottom: 22px; color: #4d4148; }
.story-wrap p.first::first-letter { font-family: var(--serif-cn); font-size: 2.4em; color: var(--gold); float: left; line-height: 1; padding: 6px 10px 0 0; }
.name-etym { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin: 44px 0; }
.etym-card { background: #fff; border: 1px solid var(--line); padding: 32px 28px; text-align: center; }
.etym-card .big { font-family: var(--serif-cn); font-size: 52px; color: var(--ink); line-height: 1; }
.etym-card .big-en { font-family: var(--serif-en); color: var(--gold); letter-spacing: 0.3em; font-size: 13px; margin-top: 8px; }
.etym-card p { margin-top: 14px; font-size: 13.5px; color: #5c4f55; text-align: left; }
.company-info { background: #fff; border: 1px solid var(--line); padding: clamp(28px, 4vw, 44px); }
.company-info h3 { font-size: 19px; letter-spacing: 0.15em; margin-bottom: 20px; }
.info-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.info-table th { text-align: left; color: var(--mist); font-weight: 400; width: 130px; padding: 12px 0; vertical-align: top; letter-spacing: 0.1em; }
.info-table td { padding: 12px 0; color: var(--ink); border-bottom: 1px dashed var(--line); }

/* ---------- 产品页 ---------- */
.promise-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.p-card { background: #fff; border: 1px solid var(--line); padding: 32px 26px; transition: 0.3s; }
.p-card:hover { border-color: var(--line-gold); transform: translateY(-4px); }
.p-card .no { font-family: var(--serif-en); color: var(--gold); font-size: 14px; letter-spacing: 0.2em; }
.p-card h3 { margin: 10px 0 10px; font-size: 18.5px; letter-spacing: 0.1em; }
.p-card p { font-size: 13.5px; color: #5c4f55; }
.brand-card { display: grid; grid-template-columns: 92px 1fr; gap: 26px; background: #fff; border: 1px solid var(--line); padding: 30px; align-items: center; margin-bottom: 18px; }
.brand-card .logo-slot {
  width: 92px; height: 92px; border: 1px solid var(--line-gold); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif-en); color: var(--gold); font-size: 12px; letter-spacing: 0.15em; text-align: center;
}
.brand-card h3 { font-size: 18px; letter-spacing: 0.08em; }
.brand-card .cat { font-size: 12px; color: var(--gold); letter-spacing: 0.2em; margin-top: 2px; }
.brand-card p { font-size: 13.5px; color: #5c4f55; margin-top: 8px; }

/* ---------- 学苑页 ---------- */
.philo-band { background: linear-gradient(180deg,var(--cream) 0%,#FBF7F2 34%,#FBF7F2 66%,var(--cream) 100%); color: var(--ink); text-align: center; border-top: 1px solid var(--line-gold); border-bottom: 1px solid var(--line-gold); }
.philo-band blockquote { font-family: var(--serif-cn); font-size: clamp(22px, 3.4vw, 32px); letter-spacing: 0.16em; }
.philo-band blockquote em { font-style: normal; color: var(--gold); }
.philo-band .note { margin-top: 18px; color: rgba(46, 34, 43, 0.6); font-size: 14px; letter-spacing: 0.1em; }
.course-list li { display: grid; grid-template-columns: 70px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px dashed var(--line); }
.course-list .no { font-family: var(--serif-en); color: var(--gold); font-size: 22px; }
.course-list h3 { font-size: 17px; letter-spacing: 0.06em; }
.course-list p { font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; }
.article-list { display: grid; grid-template-columns: 1fr; gap: 16px; }
.article-card { background: #fff; border: 1px solid var(--line); padding: 26px 28px; display: flex; justify-content: space-between; align-items: center; gap: 18px; transition: 0.3s; }
.article-card:hover { border-color: rgba(168, 84, 96, 0.4); transform: translateY(-3px); }
.article-card h3 { font-size: 16.5px; letter-spacing: 0.04em; }
.article-card .meta { font-size: 12px; color: var(--mist); margin-top: 6px; letter-spacing: 0.12em; }
.article-card .status { flex: none; font-size: 11.5px; color: var(--ruby); border: 1px solid rgba(168, 84, 96, 0.4); padding: 4px 12px; letter-spacing: 0.2em; }
.academy-sec .accent { color: var(--ruby); }

/* ---------- 新闻页 ---------- */
.news-list { max-width: 820px; margin: 0 auto; }
.news-item { display: grid; grid-template-columns: 96px 1fr; gap: 26px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.news-item .date { font-family: var(--serif-en); color: var(--mist); font-size: 15px; line-height: 1.5; }
.news-item .date b { display: block; font-size: 26px; color: var(--ink); font-weight: 500; }
.news-item h3 { font-size: 18px; letter-spacing: 0.04em; }
.news-item .cat { display: inline-block; font-size: 11.5px; color: var(--gold); border: 1px solid var(--line-gold); padding: 2px 10px; letter-spacing: 0.2em; margin-bottom: 8px; }
.news-item p { font-size: 13.5px; color: #5c4f55; margin-top: 8px; }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
.contact-info .row { display: grid; grid-template-columns: 24px 1fr; gap: 14px; padding: 16px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.contact-info .row svg { width: 18px; height: 18px; stroke: var(--gold); fill: none; stroke-width: 1.5; margin-top: 5px; }
.contact-info .label { font-size: 12px; color: var(--mist); letter-spacing: 0.2em; display: block; }
.contact-form { background: #fff; border: 1px solid var(--line); padding: clamp(28px, 4vw, 44px); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 12.5px; letter-spacing: 0.2em; color: var(--mist); margin-bottom: 8px; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--line); background: var(--cream-soft);
  padding: 12px 14px; font-size: 14.5px; font-family: var(--sans); color: var(--ink);
  transition: border-color 0.25s; outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--gold); }
.field textarea { min-height: 120px; resize: vertical; }
.form-note { font-size: 12px; color: var(--mist); margin-top: 12px; }
.form-ok { display: none; margin-top: 16px; padding: 14px 18px; background: rgba(201, 162, 75, 0.12); border: 1px solid var(--line-gold); color: var(--ink); font-size: 14px; }

/* ---------- 表单状态提示 ---------- */
.form-status { display: none; margin-top: 18px; padding: 18px 20px; font-size: 14px; line-height: 1.8; border: 1px solid var(--line-gold); background: rgba(201, 162, 75, 0.10); color: var(--ink); }
.form-status.err { border-color: rgba(168, 84, 96, 0.45); background: rgba(168, 84, 96, 0.08); }
.form-status .hint { display: block; margin-top: 6px; font-size: 12.5px; color: var(--mist); letter-spacing: 0.04em; }
.form-status .status-actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.form-status .btn { padding: 9px 18px; font-size: 12.5px; letter-spacing: 0.14em; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--cream-soft); color: rgba(46, 34, 43, 0.66); margin-top: 0; border-top: 1px solid var(--line-gold); }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding: 64px 0 44px; }
.site-footer h4, .site-footer h3.footer-title { color: var(--ink); font-family: var(--serif-cn); font-size: 15px; letter-spacing: 0.25em; margin-bottom: 18px; }
.footer-brand .cn { font-family: var(--serif-cn); color: var(--ink); font-size: 20px; letter-spacing: 0.2em; }
.footer-brand .en { font-family: var(--serif-en); color: var(--gold); letter-spacing: 0.3em; font-size: 12px; margin-top: 4px; }
.footer-brand p { margin-top: 16px; font-size: 13px; line-height: 1.9; }
.site-footer ul li { margin-bottom: 10px; font-size: 13.5px; }
.site-footer ul a:hover { color: var(--gold); }
.entity-block {
  border-top: 1px solid rgba(201, 162, 75, 0.35);
  padding: 26px 0; text-align: center; font-size: 13px; letter-spacing: 0.06em;
  color: #9C7A34;
}
.entity-block .sep { margin: 0 10px; opacity: 0.5; }
.footer-bottom { padding: 18px 0 26px; text-align: center; font-size: 12px; color: rgba(46, 34, 43, 0.4); letter-spacing: 0.1em; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-sym { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .manifesto-grid { grid-template-columns: 1.2fr 0.8fr; }
  .academy-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 0.9fr 1.1fr; }
  .article-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .main-nav {
    position: fixed; inset: 0 0 0 auto; width: min(78vw, 320px);
    background: var(--ink-deep); color: var(--cream);
    transform: translateX(100%); transition: transform 0.35s ease;
    padding: 100px 36px; z-index: 99;
  }
  .main-nav.open { transform: none; }
  .main-nav ul { flex-direction: column; gap: 8px; }
  .main-nav a { display: block; padding: 12px 0; font-size: 17px; border-bottom: 1px solid rgba(201, 162, 75, 0.18); }
  .nav-toggle { display: block; position: relative; z-index: 101; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat + .stat { border-left: 0; border-top: 1px solid var(--line); padding-top: 24px; }
  .name-etym { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 8px; }
  .brand-card { grid-template-columns: 72px 1fr; }
  .brand-card .logo-slot { width: 72px; height: 72px; }
}

/* ---------- 移动端专项优化（2026-10-20） ---------- */
/* 全局防横向滚动（off-canvas 抽屉等绝对定位元素的保险丝） */
html, body { overflow-x: hidden; overflow-x: clip; }

@media (max-width: 860px) {
  /* 侧滑抽屉：关闭时 visibility 隐藏，不再撑出横向滚动条；保留双向滑动画 */
  .main-nav { visibility: hidden; transition: transform 0.35s ease, visibility 0s linear 0.35s; }
  .main-nav.open { visibility: visible; transition: transform 0.35s ease, visibility 0s; }
}

@media (max-width: 640px) {
  /* 首页 Hero */
  .hero-inner { padding-top: 76px; }
  .hero-sym { width: 96px; margin-bottom: 26px; }
  .hero .en-kicker { letter-spacing: 0.3em; font-size: 11px; }
  .hero h1 { letter-spacing: 0.1em; }
  .hero .en-title { letter-spacing: 0.3em; }
  .hero .slogan { letter-spacing: 0.06em; }
  .hero p.lede { font-size: 14.5px; }
  .hero-rings { width: 100vmax; right: -34vmax; opacity: 0.5; }
  .hero-cta { flex-direction: column; gap: 14px; }
  .hero-cta .btn { width: 100%; }

  /* 内页页头 */
  .page-hero { padding: 116px 0 54px; }
  .page-hero .kicker { letter-spacing: 0.3em; }
  .page-hero .en-sub { letter-spacing: 0.2em; }

  /* 表单：输入框 ≥16px，防 iOS Safari 聚焦自动放大 */
  .field input, .field select, .field textarea { font-size: 16px; }

  /* 金句带 */
  .quote-band blockquote { letter-spacing: 0.08em; }

  /* 实体信息块：长串小字 + 允许优雅换行 */
  .entity-block { font-size: 11.5px; line-height: 2.1; }
  .entity-block .sep { margin: 0 6px; }

  /* 按钮触控区 */
  .btn { padding: 13px 26px; }
}

/* ===== 主题变量补充（深浅色切换系统 · 2026-10-20）===== */
:root{
  --bg: var(--cream);          /* 页面底色 */
  --surface: #ffffff;          /* 卡片/面板 */
  --ink-soft: #5c4f55;        /* 次级正文 */
}
body{ background: var(--bg); }
.academy-band{ background: linear-gradient(155deg, #34273200, #34273200), var(--bg); }

/* 头部随主题（data-theme 在首屏内联脚本中已设定，无闪烁） */
:root[data-theme="light"] .site-header{
  color: var(--ink);
  background: rgba(247,241,234,.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--line);
}
:root[data-theme="light"] .site-header.scrolled{ background: rgba(247,241,234,.96); }
:root[data-theme="dark"] .site-header{ color: var(--cream); background: transparent; }
:root[data-theme="dark"] .site-header.scrolled{ background: rgba(8,16,25,.9); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }

/* 主题切换按钮 */
.theme-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:50%;border:1px solid var(--line-gold);
  background:transparent;color:inherit;cursor:pointer;margin-left:8px;flex:none;
  transition:background .3s,transform .3s;
}
.theme-toggle:hover{ background:rgba(201,162,75,.14); }
.theme-toggle svg{ width:18px;height:18px; }
.theme-toggle .i-sun{ display:none; }
:root[data-theme="dark"] .theme-toggle .i-sun{ display:inline; }
:root[data-theme="dark"] .theme-toggle .i-moon{ display:none; }
:root[data-theme="dark"] .theme-toggle{ border-color:rgba(212,175,106,.5); }

/* 主题切换平滑过渡 */
:root[data-theme] body,
:root[data-theme] .m-card,
:root[data-theme] .a-card,
:root[data-theme] .site-footer,
:root[data-theme] .quote-band,
:root[data-theme] .philo-band{ transition: background .4s ease, color .4s ease, border-color .4s ease; }

/* ===== 深空（夜间）主题 ===== */
:root[data-theme="dark"]{
  --bg:#0C1726; --surface:#13243A; --cream-soft:#0E1C2E;
  --ink:#EDEAF2; --ink-deep:#081019; --mist:#AEB4C6;
  --line:rgba(237,234,242,.12); --line-gold:rgba(201,162,75,.38); --ink-soft:rgba(237,234,242,.72);
}
:root[data-theme="dark"] body{ color:var(--ink); }
:root[data-theme="dark"] .page-hero{
  background: radial-gradient(ellipse 80% 100% at 80% 0%, rgba(42,82,126,.35), transparent 55%),
              linear-gradient(180deg,var(--surface) 0%,var(--bg) 72%);
  color:var(--cream);
}
:root[data-theme="dark"] .page-hero .en-sub{ color:rgba(212,175,106,.85); }
:root[data-theme="dark"] .breadcrumb{ color:rgba(237,234,242,.55); }
:root[data-theme="dark"] .manifesto{ background:var(--bg); }
:root[data-theme="dark"] .manifesto .note{ color:var(--mist); }
:root[data-theme="dark"] .stats{ background:linear-gradient(180deg,var(--bg) 0%,var(--surface) 34%,var(--surface) 66%,var(--bg) 100%); border-color:var(--line); }
:root[data-theme="dark"] .stat .num{ color:var(--ink); }
:root[data-theme="dark"] .stat .label{ color:var(--mist); }
:root[data-theme="dark"] .m-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .m-card p{ color:var(--ink-soft); }
:root[data-theme="dark"] .m-card:hover{ box-shadow:0 18px 40px rgba(0,0,0,.45); }
:root[data-theme="dark"] .a-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .a-card p{ color:var(--ink-soft); }
:root[data-theme="dark"] .a-card:hover{ box-shadow:0 20px 44px rgba(0,0,0,.45); }
:root[data-theme="dark"] .academy-band{ background:var(--bg); }
:root[data-theme="dark"] .quote-band{ background:radial-gradient(ellipse 62% 75% at 50% 46%,rgba(201,162,75,.06),transparent 70%),linear-gradient(180deg,var(--bg) 0%,var(--surface) 34%,var(--surface) 66%,var(--bg) 100%); color:var(--ink); border-top:1px solid var(--line-gold); border-bottom:1px solid var(--line-gold); }
:root[data-theme="dark"] .quote-band cite{ color:var(--amber); }
:root[data-theme="dark"] .philo-band{ background:linear-gradient(180deg,var(--bg) 0%,var(--surface) 34%,var(--surface) 66%,var(--bg) 100%); color:var(--ink); border-top:1px solid var(--line-gold); border-bottom:1px solid var(--line-gold); }
:root[data-theme="dark"] .philo-band .note{ color:rgba(237,234,242,.6); }
:root[data-theme="dark"] .faq-a .inner{ color:var(--ink-soft); }
:root[data-theme="dark"] .story-wrap p{ color:var(--ink-soft); }
:root[data-theme="dark"] .etym-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .etym-card p{ color:var(--ink-soft); }
:root[data-theme="dark"] .company-info{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .info-table td{ border-bottom:1px dashed var(--line); }
:root[data-theme="dark"] .p-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .p-card p{ color:var(--ink-soft); }
:root[data-theme="dark"] .brand-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .brand-card p{ color:var(--ink-soft); }
:root[data-theme="dark"] .course-list p{ color:var(--ink-soft); }
:root[data-theme="dark"] .article-card{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .article-card:hover{ border-color:rgba(168,84,96,.5); }
:root[data-theme="dark"] .news-item p{ color:var(--ink-soft); }
:root[data-theme="dark"] .contact-form{ background:var(--surface); border-color:var(--line); }
:root[data-theme="dark"] .field input,
:root[data-theme="dark"] .field select,
:root[data-theme="dark"] .field textarea{ background:var(--cream-soft); color:var(--ink); border-color:var(--line); }
:root[data-theme="dark"] .field label{ color:var(--mist); }
:root[data-theme="dark"] .form-note{ color:var(--mist); }
:root[data-theme="dark"] .site-footer{ background:var(--cream-soft); color:rgba(237,234,242,.66); border-top:1px solid var(--line-gold); }
:root[data-theme="dark"] .site-footer h4, :root[data-theme="dark"] .site-footer h3.footer-title{ color:var(--ink); }
:root[data-theme="dark"] .footer-brand .cn{ color:var(--ink); }
:root[data-theme="dark"] .footer-brand .en{ color:var(--amber); }
:root[data-theme="dark"] .footer-bottom{ color:rgba(237,234,242,.4); }
:root[data-theme="dark"] .entity-block{ color:rgba(212,175,106,.85); border-top:1px solid var(--line-gold); }
:root[data-theme="dark"] .main-nav{ background:var(--ink-deep); color:var(--cream); }

/* ===== 曜光（日间）主题 · 根站补充 ===== */
:root[data-theme="light"] .page-hero{
  background: radial-gradient(ellipse 80% 100% at 80% 0%, rgba(201,162,75,.10), transparent 55%),
              linear-gradient(180deg,#FBF7F2 0%,var(--cream) 72%);
  color:var(--ink);
}
:root[data-theme="light"] .page-hero .en-sub{ color:rgba(201,162,75,.85); }
:root[data-theme="light"] .breadcrumb{ color:rgba(46,34,43,.55); }