/* ============================================================
   泰林装饰 · 组件与区块样式
   ============================================================ */

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: background var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.site-header.solid {
  background: rgba(253, 251, 246, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-1);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark {
  font-family: var(--font-display);
  font-size: 1.5rem; font-weight: 900; letter-spacing: 0.08em;
}
.brand-mark em { font-style: normal; color: var(--accent-ink); }
.brand-sub {
  font-size: var(--fs-xs); color: var(--muted); letter-spacing: 0.22em;
}
.brand-logo { display: block; height: 46px; width: auto; }
.nav-links { display: flex; gap: var(--sp-1); }
.nav-links a {
  display: inline-flex; align-items: center;
  padding: 10px 14px; min-height: 44px;
  font-size: var(--fs-sm); letter-spacing: 0.08em; color: var(--ink-soft);
  position: relative;
}
/* 悬停下划线扫过 */
.nav-links a::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 8px;
  height: 1.5px; background: var(--accent-ink);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { transform: scaleX(1); }
.nav-links a[aria-current="page"] { color: var(--accent-ink); font-weight: 700; }
.nav-cta {
  display: inline-flex; align-items: center; min-height: 44px;
  padding: 10px 22px; border: 1.5px solid var(--ink);
  font-size: var(--fs-sm); letter-spacing: 0.1em;
  transition: background var(--dur-fast) ease-out, color var(--dur-fast) ease-out;
}
.nav-cta:hover { background: var(--ink); color: var(--dark-text); }

/* 移动端菜单 */
.nav-toggle {
  display: none; width: 44px; height: 44px; border: none; background: none;
  cursor: pointer; position: relative; z-index: 60;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 10px; width: 24px; height: 2px;
  background: var(--ink); transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast);
}
.nav-toggle span { top: 21px; }
.nav-toggle span::before { left: 0; top: -7px; }
.nav-toggle span::after { left: 0; top: 7px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed; inset: 0; z-index: 45; /* 低于 header(50)，保证汉堡按钮可点击关闭 */
  background: rgba(29, 23, 16, 0.97);
  padding: 96px var(--sp-5) var(--sp-6);
}
.mobile-menu.open { display: block; }
/* 菜单打开时：header 融入深色菜单背景 */
.site-header.menu-open { background: transparent; box-shadow: none; backdrop-filter: none; }
.site-header.menu-open .brand-mark { color: var(--dark-text); }
.site-header.menu-open .brand-logo { filter: brightness(0) invert(1); }
.site-header.menu-open .brand-sub { color: var(--dark-muted); }
.site-header.menu-open .nav-toggle span,
.site-header.menu-open .nav-toggle span::before,
.site-header.menu-open .nav-toggle span::after { background: var(--dark-text); }
.mobile-menu a {
  display: block; padding: 16px 0; min-height: 44px;
  font-family: var(--font-display); font-size: var(--fs-lg);
  color: var(--dark-text); border-bottom: 1px solid rgba(240, 233, 221, 0.12);
}

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative; min-height: 92vh;
  display: flex; align-items: flex-end;
  overflow: hidden;
}
.hero-media {
  position: absolute; inset: 0; z-index: 0;
}
.hero-media img {
  width: 100%; height: 100%; object-fit: cover;
  animation: heroZoom 14s var(--ease-out) forwards;
}
@keyframes heroZoom { from { transform: scale(1.08); } to { transform: scale(1); } }
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(to top, rgba(32, 24, 14, 0.80) 0%, rgba(32, 24, 14, 0.30) 45%, rgba(32, 24, 14, 0.10) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  width: 100%; padding: var(--sp-8) 0 var(--sp-7);
  color: var(--dark-text);
}
.hero-kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: var(--fs-sm); letter-spacing: 0.35em; color: #e6c493;
  margin-bottom: var(--sp-3);
}
.hero-kicker::before { content: ""; width: 40px; height: 1px; background: #e6c493; }
.hero h1 {
  font-size: var(--fs-hero); font-weight: 900;
  letter-spacing: 0.04em; line-height: 1.12;
  max-width: 14em;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.55), 0 4px 32px rgba(0, 0, 0, 0.45);
}
.hero p {
  margin-top: var(--sp-3);
  font-size: var(--fs-md); color: rgba(240, 233, 221, 0.85);
  max-width: 34em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-top: var(--sp-5); }

/* 入场错峰序列：3 组，间隔 120ms */
.hero-load { opacity: 0; transform: translateY(28px); }
.hero-load.d1 { animation: rise 700ms var(--ease-out) 100ms forwards; }
.hero-load.d2 { animation: rise 700ms var(--ease-out) 220ms forwards; }
.hero-load.d3 { animation: rise 700ms var(--ease-out) 340ms forwards; }
@keyframes rise { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .hero-load { opacity: 1; transform: none; animation: none; }
  .hero-media img { animation: none; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 12px 30px;
  font-size: var(--fs-sm); letter-spacing: 0.14em;
  border: 1.5px solid transparent; cursor: pointer;
  transition: background var(--dur-fast) ease-out, color var(--dur-fast) ease-out,
              border-color var(--dur-fast) ease-out, transform var(--dur-fast) ease-out;
}
.btn:active { transform: translateY(1px); }
.btn-solid { background: var(--accent-ink); color: #fdfbf6; }
.btn-solid:hover { background: #5e3a15; }
.btn-ghost { border-color: currentColor; color: inherit; }
.btn-ghost:hover { background: rgba(240, 233, 221, 0.12); }

/* ---------- 通用区块 ---------- */
.section { padding: var(--sp-8) 0; position: relative; }
.section-head { margin-bottom: var(--sp-6); }
.section-num {
  font-family: var(--font-display);
  font-size: var(--fs-sm); letter-spacing: 0.3em;
  color: var(--accent-ink); margin-bottom: var(--sp-2);
  display: flex; align-items: center; gap: 12px;
}
.section-num::after { content: ""; width: 56px; height: 1px; background: var(--accent); }
.section-head h2 {
  font-size: var(--fs-2xl); font-weight: 900; letter-spacing: 0.02em;
}
.section-head .lede {
  margin-top: var(--sp-3); color: var(--muted); max-width: 40em;
}
.head-row {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: var(--sp-4); flex-wrap: wrap;
}
.link-more {
  font-size: var(--fs-sm); letter-spacing: 0.12em; color: var(--accent-ink);
  border-bottom: 1px solid var(--accent); padding-bottom: 4px;
  transition: letter-spacing var(--dur-base) var(--ease-out);
}
.link-more:hover { letter-spacing: 0.2em; }

/* ---------- 数字条 ---------- */
.stats-band { background: var(--dark-bg); color: var(--dark-text); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4); padding: var(--sp-6) 0;
}
.stat { border-left: 1px solid rgba(240, 233, 221, 0.18); padding-left: var(--sp-3); }
.stat b {
  display: block; font-family: var(--font-display);
  font-size: var(--fs-2xl); font-weight: 900; color: #e6c493;
  font-variant-numeric: tabular-nums;
}
.stat span { font-size: var(--fs-sm); color: var(--dark-muted); letter-spacing: 0.1em; }

/* ---------- 公司简介（首页）---------- */
.about-strip { display: grid; grid-template-columns: 1.1fr 1fr; gap: var(--sp-6); align-items: center; }
.about-strip .photo { position: relative; }
.about-strip .photo img { box-shadow: var(--shadow-2); }
/* 记忆点：古铜角标括号 */
.photo-frame { position: relative; }
.photo-frame::before, .photo-frame::after {
  content: ""; position: absolute; width: 72px; height: 72px;
  border: 2px solid var(--accent); pointer-events: none;
}
.photo-frame::before { top: -14px; left: -14px; border-right: none; border-bottom: none; }
.photo-frame::after { bottom: -14px; right: -14px; border-left: none; border-top: none; }
.about-copy h2 { font-size: var(--fs-xl); margin-bottom: var(--sp-3); }
.about-copy p { color: var(--ink-soft); margin-bottom: var(--sp-3); }
.quote-mark {
  font-family: var(--font-display); font-size: var(--fs-lg);
  color: var(--accent-ink); border-left: 3px solid var(--accent);
  padding: 4px 0 4px 18px; margin: var(--sp-4) 0;
}

/* ---------- 核心业务 ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-4); }
.biz-card {
  background: var(--surface); border: 1px solid var(--line);
  padding: var(--sp-5) var(--sp-4);
  position: relative; overflow: hidden;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.biz-card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(156, 107, 50, 0.08), transparent 55%);
  opacity: 0; transition: opacity var(--dur-base) var(--ease-out);
}
.biz-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); border-color: var(--accent); }
.biz-card:hover::before { opacity: 1; }
.biz-index {
  font-family: var(--font-display); font-size: var(--fs-lg);
  color: var(--accent); font-variant-numeric: tabular-nums;
}
.biz-card h3 { font-size: var(--fs-md); margin: var(--sp-2) 0; }
.biz-card p { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 案例卡片 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4) var(--sp-4); }
.case-card {
  position: relative; overflow: hidden; display: block;
  aspect-ratio: 4 / 3.4; background: var(--dark-surface);
}
.case-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 700ms var(--ease-out), opacity var(--dur-base) ease-out;
}
.case-card:hover img { transform: scale(1.05); }
.case-meta {
  position: absolute; inset: auto 0 0 0; z-index: 2;
  padding: var(--sp-8) var(--sp-4) var(--sp-4);
  color: var(--dark-text);
  background: linear-gradient(to top, rgba(20, 15, 9, 0.85), transparent);
}
.case-meta .tag {
  font-size: var(--fs-xs); letter-spacing: 0.2em; color: #e6c493;
}
.case-meta h3 { font-size: var(--fs-md); margin-top: 4px; }
.case-meta span { font-size: var(--fs-xs); color: rgba(240, 233, 221, 0.75); }
/* 案例大卡：首页精选中跨两列 */
.case-card.wide { grid-column: span 2; aspect-ratio: 8 / 3.4; }

/* ---------- 施工标准（深色区）---------- */
.dark-section { background: var(--dark-bg); color: var(--dark-text); }
.dark-section .section-num { color: #e6c493; }
.dark-section .section-num::after { background: #e6c493; }
.dark-section .section-head .lede { color: var(--dark-muted); }
.std-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: rgba(240, 233, 221, 0.14); border: 1px solid rgba(240, 233, 221, 0.14); }
.std-item { background: var(--dark-bg); padding: var(--sp-4) var(--sp-5); transition: background var(--dur-fast); }
.std-item:hover { background: var(--dark-surface); }
.std-item h3 { font-size: var(--fs-md); display: flex; align-items: baseline; gap: 12px; }
.std-item h3 i { font-style: normal; font-size: var(--fs-sm); color: #e6c493; font-variant-numeric: tabular-nums; }
.std-item p { font-size: var(--fs-sm); color: var(--dark-muted); margin-top: var(--sp-2); }

/* ---------- 材料样板 ---------- */
.mat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.mat-card { position: relative; overflow: hidden; }
.mat-card img { aspect-ratio: 1 / 1; width: 100%; object-fit: cover; transition: transform 700ms var(--ease-out); }
.mat-card:hover img { transform: scale(1.06); }
.mat-card figcaption {
  padding: var(--sp-3) 2px;
}
.mat-card figcaption b { font-family: var(--font-display); font-size: var(--fs-base); }
.mat-card figcaption span { display: block; font-size: var(--fs-xs); color: var(--muted); letter-spacing: 0.06em; }

/* ---------- 合作伙伴 跑马灯 ---------- */
.partner-band { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: var(--sp-5) 0; }
.marquee { display: flex; overflow: hidden; user-select: none; gap: var(--sp-6); }
.marquee-track {
  display: flex; gap: var(--sp-6); align-items: center; flex-shrink: 0;
  animation: scroll 36s linear infinite;
  padding-right: var(--sp-6);
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll { to { transform: translateX(-100%); } }
.partner-logo {
  font-family: var(--font-display); font-size: var(--fs-md); font-weight: 600;
  color: var(--muted); white-space: nowrap; letter-spacing: 0.12em;
  transition: color var(--dur-fast);
}
.partner-logo:hover { color: var(--accent-ink); }

/* ---------- 时间轴（发展历程）---------- */
.timeline { position: relative; margin-top: var(--sp-6); padding-left: 40px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--accent) 0%, var(--line-strong) 100%);
}
.tl-item { position: relative; padding-bottom: var(--sp-5); }
.tl-item::before {
  content: ""; position: absolute; left: -38px; top: 8px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bg); border: 2.5px solid var(--accent-ink);
}
.tl-item b {
  font-family: var(--font-display); font-size: var(--fs-lg);
  color: var(--accent-ink); font-variant-numeric: tabular-nums;
  display: block; line-height: 1.3;
}
.tl-item h3 { font-size: var(--fs-md); margin: 2px 0 6px; }
.tl-item p { color: var(--muted); max-width: 44em; font-size: var(--fs-sm); }

/* ---------- 资质证照 ---------- */
.cert-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
.cert-card {
  background: var(--surface); border: 1px dashed var(--line-strong);
  min-height: 280px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  padding: var(--sp-5); gap: var(--sp-2);
}
.cert-card .seal {
  width: 64px; height: 64px; border: 2px solid var(--accent);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); color: var(--accent-ink); font-size: var(--fs-sm);
  margin-bottom: var(--sp-2);
}
.cert-card h3 { font-size: var(--fs-base); }
.cert-card p { font-size: var(--fs-xs); color: var(--muted); }
.lic-note {
  margin-top: var(--sp-4); padding: var(--sp-3) var(--sp-4);
  background: rgba(156, 107, 50, 0.08); border-left: 3px solid var(--accent);
  font-size: var(--fs-sm); color: var(--ink-soft);
}

/* ---------- 联系与留言 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: var(--sp-6); }
.contact-info h3 { font-size: var(--fs-md); margin-bottom: var(--sp-3); }
.contact-line {
  display: flex; gap: var(--sp-3); padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--line); align-items: baseline;
}
.contact-line b { font-family: var(--font-display); min-width: 5.5em; color: var(--accent-ink); font-weight: 600; }
.contact-line span { color: var(--ink-soft); }
.form-field { margin-bottom: var(--sp-4); }
.form-field label {
  display: block; font-size: var(--fs-sm); letter-spacing: 0.08em;
  color: var(--ink-soft); margin-bottom: var(--sp-2);
}
.form-field label em { font-style: normal; color: var(--accent-ink); }
.form-field input, .form-field textarea, .form-field select {
  width: 100%; min-height: 48px; padding: 12px 14px;
  font: inherit; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.form-field textarea { min-height: 140px; resize: vertical; }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  outline: none; border-color: var(--accent-ink);
  box-shadow: 0 0 0 3px rgba(156, 107, 50, 0.18);
}
.form-field .err {
  display: none; font-size: var(--fs-xs); color: #a13a1e; margin-top: 6px;
}
.form-field.invalid input, .form-field.invalid textarea { border-color: #a13a1e; }
.form-field.invalid .err { display: block; }
.form-success {
  display: none; text-align: center; padding: var(--sp-6) var(--sp-4);
  border: 1px solid var(--accent); background: rgba(156, 107, 50, 0.06);
}
.form-success.show { display: block; }
.form-success h3 { font-size: var(--fs-lg); color: var(--accent-ink); margin-bottom: var(--sp-2); }
.form-success p { color: var(--ink-soft); font-size: var(--fs-sm); margin-bottom: var(--sp-3); }
.form-actions { display: flex; gap: var(--sp-3); flex-wrap: wrap; justify-content: center; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--dark-bg); color: var(--dark-text);
  padding: var(--sp-7) 0 var(--sp-4);
  position: relative; z-index: 1;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: var(--sp-5); padding-bottom: var(--sp-6); }
.footer-grid h3 { font-size: var(--fs-sm); letter-spacing: 0.2em; color: #e6c493; margin-bottom: var(--sp-3); }
.footer-grid a, .footer-grid p { font-size: var(--fs-sm); color: var(--dark-muted); display: block; padding: 4px 0; }
.footer-grid a:hover { color: var(--dark-text); }
.footer-brand .brand-mark { color: var(--dark-text); font-size: 1.7rem; }
.footer-logo {
  display: inline-block; background: #fff; border-radius: 6px;
  padding: 10px 14px; line-height: 0;
}
.footer-logo img { height: 40px; width: auto; display: block; }
.footer-brand p { margin-top: var(--sp-2); max-width: 24em; }
.footer-bottom {
  border-top: 1px solid rgba(240, 233, 221, 0.12);
  padding-top: var(--sp-4);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--sp-2);
  font-size: var(--fs-xs); color: var(--dark-muted);
}

/* ---------- 页头（内页 banner）---------- */
.page-banner {
  padding: calc(72px + var(--sp-7)) 0 var(--sp-6);
  background:
    radial-gradient(40rem 20rem at 85% -20%, rgba(156, 107, 50, 0.14), transparent 60%),
    var(--dark-bg);
  color: var(--dark-text);
  position: relative; z-index: 1;
}
.page-banner .crumb { font-size: var(--fs-xs); letter-spacing: 0.2em; color: var(--dark-muted); margin-bottom: var(--sp-2); }
.page-banner h1 { font-size: var(--fs-2xl); font-weight: 900; letter-spacing: 0.04em; }
.page-banner .lede { margin-top: var(--sp-2); color: var(--dark-muted); max-width: 42em; }

/* ---------- 案例筛选 ---------- */
.filter-bar { display: flex; gap: var(--sp-2); flex-wrap: wrap; margin-bottom: var(--sp-5); }
.filter-btn {
  min-height: 44px; padding: 8px 20px; cursor: pointer;
  background: none; border: 1px solid var(--line-strong);
  font: inherit; font-size: var(--fs-sm); letter-spacing: 0.1em; color: var(--ink-soft);
  transition: all var(--dur-fast) ease-out;
}
.filter-btn:hover { border-color: var(--accent-ink); color: var(--accent-ink); }
.filter-btn.active { background: var(--ink); color: var(--dark-text); border-color: var(--ink); }

/* ---------- 施工工艺流程 ---------- */
.flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-4); counter-reset: flow; }
.flow-step { counter-increment: flow; position: relative; padding: var(--sp-4) 0 0; border-top: 2px solid var(--accent); }
.flow-step::before {
  content: counter(flow, decimal-leading-zero);
  font-family: var(--font-display); font-size: var(--fs-lg);
  color: var(--accent); font-variant-numeric: tabular-nums;
  display: block; margin-bottom: var(--sp-2);
}
.flow-step h3 { font-size: var(--fs-base); margin-bottom: var(--sp-2); }
.flow-step p { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 数据表格（验收标准）---------- */
.std-table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); }
.std-table th, .std-table td {
  text-align: left; padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}
.std-table th {
  font-family: var(--font-display); letter-spacing: 0.1em;
  color: var(--accent-ink); border-bottom: 2px solid var(--accent);
  white-space: nowrap;
}
.std-table td { color: var(--ink-soft); }
.std-table tr:hover td { background: rgba(156, 107, 50, 0.05); }
.table-scroll { overflow-x: auto; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .case-card.wide { grid-column: span 2; }
  .mat-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .about-strip, .contact-grid, .cert-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--sp-4) var(--sp-3); }
  .case-grid { grid-template-columns: 1fr; }
  .case-card.wide { grid-column: span 1; aspect-ratio: 4 / 3.4; }
  .mat-grid { grid-template-columns: repeat(2, 1fr); }
  .std-list { grid-template-columns: 1fr; }
  .section { padding: var(--sp-7) 0; }
  .hero { min-height: 86vh; }
  .page-banner { padding: calc(72px + var(--sp-6)) 0 var(--sp-5); }
}
@media (max-width: 480px) {
  .biz-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .flow-grid { grid-template-columns: 1fr; }
  .brand-sub { display: none; }
}

/* ===== 真实证书照片展示 ===== */
.cert-photo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-4); }
.cert-photo-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
figure.cert-photo {
  background: var(--surface); border: 1px solid var(--line);
  padding: var(--sp-3); text-align: center; margin: 0;
  display: flex; flex-direction: column;
}
figure.cert-photo img {
  width: 100%; height: auto; display: block; flex: 1; object-fit: contain;
  border: 1px solid var(--line); box-shadow: 0 8px 28px rgba(34, 27, 18, 0.10);
  background: #fff;
}
figure.cert-photo figcaption { margin-top: var(--sp-3); }
figure.cert-photo b { display: block; font-size: var(--fs-sm); }
figure.cert-photo span { font-size: var(--fs-xs); color: var(--muted); }
@media (max-width: 900px) {
  .cert-photo-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .cert-photo-grid, .cert-photo-grid.cols-2 { grid-template-columns: 1fr; }
}