:root {
  --brand: #2f5d50;
  --brand-2: #7a9e7e;
  --brand-3: #3d7a63;
  --accent: #c9a227;
  --accent-2: #e2c05b;
  --ink: #1c1c1c;
  --ink-soft: #2a2a2a;
  --muted: #5b5b5b;
  --bg: #f7f5ef;
  --bg-2: #efece2;
  --card: #ffffff;
  --card-glass: rgba(255, 255, 255, 0.72);
  --line: #e2ddd0;
  --line-soft: rgba(47, 93, 80, 0.12);
  --radius: 14px;
  --radius-lg: 22px;
  --radius-sm: 9px;
  --shadow: 0 6px 24px rgba(20, 40, 30, 0.08);
  --shadow-hover: 0 18px 44px rgba(20, 40, 30, 0.16);
  --shadow-glass: 0 8px 32px rgba(20, 40, 30, 0.14);
  --maxw: 1180px;
  --grad-brand: linear-gradient(135deg, #2f5d50 0%, #3d7a63 42%, #7a9e7e 100%);
  --grad-accent: linear-gradient(135deg, #c9a227 0%, #e2c05b 100%);
  --grad-hero: linear-gradient(130deg, #234a3f 0%, #2f5d50 34%, #4e7a63 66%, #7a9e7e 100%);
  --grad-soft: linear-gradient(160deg, rgba(47, 93, 80, 0.06), rgba(201, 162, 39, 0.07));
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-theme="dark"] {
  --brand: #9fd3b8;
  --brand-2: #4e7a63;
  --brand-3: #6fb894;
  --accent: #e2c05b;
  --accent-2: #f0d78a;
  --ink: #eaeae4;
  --ink-soft: #d8dad3;
  --muted: #a9b0a9;
  --bg: #141816;
  --bg-2: #101312;
  --card: #1d2320;
  --card-glass: rgba(29, 35, 32, 0.68);
  --line: #2c3530;
  --line-soft: rgba(159, 211, 184, 0.14);
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 18px 44px rgba(0, 0, 0, 0.55);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.5);
  --grad-brand: linear-gradient(135deg, #1c3b32 0%, #2f5d50 48%, #4e7a63 100%);
  --grad-hero: linear-gradient(130deg, #0f1a16 0%, #1c3b32 38%, #2f5d50 70%, #4e7a63 100%);
  --grad-soft: linear-gradient(160deg, rgba(159, 211, 184, 0.07), rgba(226, 192, 91, 0.06));
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif SC", Georgia, "Microsoft YaHei", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.85;
  font-size: 17px;
  overflow-x: hidden;
  transition: background 0.45s var(--ease), color 0.45s var(--ease);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(122, 158, 126, 0.14), transparent 42%),
    radial-gradient(circle at 88% 78%, rgba(201, 162, 39, 0.1), transparent 46%);
}

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

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.28s var(--ease), opacity 0.28s var(--ease);
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 12px;
  top: 12px;
  background: var(--brand);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 999;
}

/* ============ 顶部信息条 ============ */
.topbar {
  background: var(--grad-brand);
  color: #f2e8cf;
  font-size: 13.5px;
  position: relative;
  z-index: 2;
}

.topbar .wrap {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 8px 20px;
}

.topbar a {
  color: #f2e8cf;
  position: relative;
}

.topbar a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--accent-2);
  transition: width 0.32s var(--ease);
}

.topbar a:hover {
  text-decoration: none;
}

.topbar a:hover::after {
  width: 100%;
}

.topbar .tb-right {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ============ 导航 ============ */
header.site {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: background 0.45s var(--ease), border-color 0.45s var(--ease);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  max-width: var(--maxw);
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand .logo {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border-radius: 12px;
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}

.brand:hover .logo {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 10px 24px rgba(47, 93, 80, 0.32);
}

.brand b {
  font-size: 20px;
  color: var(--ink);
  display: block;
  line-height: 1.2;
}

.brand > span > span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 1px;
}

.menu {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--ink);
  position: relative;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), transform 0.3s var(--ease);
}

.menu a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.34s var(--ease);
}

.menu a:hover {
  background: var(--bg);
  text-decoration: none;
  color: var(--brand);
  transform: translateY(-2px);
}

.menu a:hover::after {
  transform: scaleX(1);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.searchbox {
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.searchbox:focus-within {
  border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(122, 158, 126, 0.22);
}

.searchbox input {
  border: 0;
  background: transparent;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--ink);
  width: 150px;
  outline: none;
  font-family: inherit;
}

.searchbox input::placeholder {
  color: var(--muted);
}

.searchbox button {
  border: 0;
  background: var(--grad-brand);
  color: #f2e8cf;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: filter 0.3s var(--ease);
}

.searchbox button:hover {
  filter: brightness(1.12);
}

.icon-btn {
  border: 1px solid var(--line);
  background: var(--card-glass);
  color: var(--ink);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: transform 0.35s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.icon-btn:hover {
  transform: translateY(-2px) rotate(12deg);
  border-color: var(--brand-2);
}

.hamburger {
  display: none;
  border: 1px solid var(--line);
  background: var(--card-glass);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 16px;
  color: var(--ink);
  font-family: inherit;
  transition: transform 0.3s var(--ease);
}

.hamburger:hover {
  transform: scale(1.06);
}

/* ============ 轮播 Banner ============ */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-hero);
  color: #f7f5ef;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 18%, rgba(226, 192, 91, 0.22), transparent 44%),
    radial-gradient(circle at 8% 86%, rgba(122, 158, 126, 0.28), transparent 48%);
}

.slides {
  display: flex;
  transition: transform 0.8s var(--ease);
  position: relative;
  z-index: 1;
}

.slide {
  min-width: 100%;
  padding: 64px 20px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  max-width: var(--maxw);
  margin: 0 auto;
}

.slide h1,
.slide h2 {
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.35;
  margin: 0 0 14px;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.22);
}

.slide p {
  font-size: 16.5px;
  color: #e8efe9;
  margin: 0 0 18px;
  max-width: 640px;
}

.slide .cta {
  display: inline-block;
  background: var(--grad-accent);
  color: #2a2410;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: 0 8px 22px rgba(201, 162, 39, 0.32);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), filter 0.35s var(--ease);
}

.slide .cta:hover {
  text-decoration: none;
  filter: brightness(1.06);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 30px rgba(201, 162, 39, 0.44);
}

.slide-art {
  background: rgba(255, 255, 255, 0.1);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-glass);
  transition: transform 0.6s var(--ease), box-shadow 0.6s var(--ease);
}

.slide-art:hover {
  transform: translateY(-6px) rotate(-1deg);
  box-shadow: 0 22px 52px rgba(0, 0, 0, 0.3);
}

.slide-art svg {
  border-radius: var(--radius);
}

.dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 3;
}

.dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 0;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  padding: 0;
  transition: width 0.4s var(--ease), background 0.4s var(--ease);
}

.dots button.on {
  background: var(--accent-2);
  width: 26px;
  border-radius: 6px;
}

.hero-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.28);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  z-index: 3;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}

.hero-nav:hover {
  background: rgba(0, 0, 0, 0.5);
  transform: translateY(-50%) scale(1.1);
}

.hero-nav.prev {
  left: 12px;
}

.hero-nav.next {
  right: 12px;
}

/* ============ 面包屑 ============ */
.crumb {
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 2;
}

.crumb .wrap {
  padding: 10px 20px;
  font-size: 13.5px;
  color: var(--muted);
}

.crumb a {
  color: var(--muted);
}

.crumb a:hover {
  color: var(--brand);
}

/* ============ 通用区块 ============ */
section {
  padding: 56px 0;
  position: relative;
}

section:nth-of-type(even) {
  background: var(--grad-soft);
}

h2.sec {
  font-size: clamp(22px, 2.4vw, 30px);
  margin: 0 0 8px;
  position: relative;
  padding-left: 16px;
}

h2.sec::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 6px;
  border-radius: 4px;
  background: var(--grad-accent);
  box-shadow: 0 0 14px rgba(201, 162, 39, 0.4);
}

.sec-sub {
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 820px;
}

h3 {
  font-size: 20px;
  margin: 28px 0 10px;
}

h4 {
  font-size: 17px;
  margin: 20px 0 8px;
  color: var(--brand);
}

p {
  margin: 0 0 14px;
}

.grid {
  display: grid;
  gap: 22px;
}

.g2 {
  grid-template-columns: repeat(2, 1fr);
}

.g3 {
  grid-template-columns: repeat(3, 1fr);
}

.g4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============ 卡片 ============ */
.card {
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.42s var(--ease), box-shadow 0.42s var(--ease), border-color 0.42s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(122, 158, 126, 0.5), transparent 42%, rgba(201, 162, 39, 0.4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.42s var(--ease);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
}

section:nth-of-type(even) .card {
  background: var(--card-glass);
}

.tag {
  display: inline-block;
  font-size: 12.5px;
  background: var(--grad-soft);
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 10px;
  margin: 0 6px 6px 0;
  transition: transform 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.tag:hover {
  transform: translateY(-2px);
  color: var(--brand);
  border-color: var(--brand-2);
}

.stat {
  font-size: 34px;
  font-weight: 700;
  color: var(--brand);
  font-family: Georgia, serif;
  line-height: 1.2;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 14px;
  color: var(--muted);
}

ul.clean {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.clean li {
  padding: 8px 0 8px 26px;
  position: relative;
  border-bottom: 1px dashed var(--line);
  transition: padding-left 0.3s var(--ease), color 0.3s var(--ease);
}

ul.clean li::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 12px;
  top: 12px;
  transition: transform 0.3s var(--ease);
}

ul.clean li:hover {
  padding-left: 32px;
  color: var(--brand);
}

ul.clean li:hover::before {
  transform: rotate(90deg) scale(1.2);
}

ol.steps {
  padding-left: 22px;
}

ol.steps li {
  margin-bottom: 10px;
  padding-left: 4px;
  transition: color 0.3s var(--ease), transform 0.3s var(--ease);
}

ol.steps li::marker {
  color: var(--accent);
  font-weight: 700;
}

ol.steps li:hover {
  color: var(--brand);
  transform: translateX(4px);
}

blockquote {
  margin: 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 0 14px 14px 0;
  color: var(--muted);
  box-shadow: var(--shadow);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--brand-2);
}

/* ============ 表格 ============ */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--card);
}

th,
td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  transition: background 0.3s var(--ease);
}

th {
  background: var(--grad-brand);
  color: #f2e8cf;
  font-weight: 700;
}

tbody tr {
  transition: background 0.3s var(--ease);
}

tbody tr:hover {
  background: var(--grad-soft);
}

/* ============ 文章列表 ============ */
.articles {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, 1fr);
}

.article {
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.42s var(--ease), box-shadow 0.42s var(--ease), border-color 0.42s var(--ease);
}

.article::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--grad-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.42s var(--ease);
}

.article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-2);
}

.article:hover::after {
  transform: scaleY(1);
}

section:nth-of-type(even) .article {
  background: var(--card-glass);
}

.article h3 {
  margin: 0 0 6px;
  font-size: 18px;
  transition: color 0.3s var(--ease);
}

.article:hover h3 {
  color: var(--brand);
}

.meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.read {
  font-weight: 700;
  display: inline-block;
  transition: transform 0.32s var(--ease), letter-spacing 0.32s var(--ease);
}

.article:hover .read {
  transform: translateX(5px);
  letter-spacing: 0.5px;
}

/* ============ FAQ ============ */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: box-shadow 0.4s var(--ease), border-color 0.4s var(--ease), transform 0.4s var(--ease);
}

.faq-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-2);
}

.faq-item.open {
  border-color: var(--brand-2);
}

section:nth-of-type(even) .faq-item {
  background: var(--card-glass);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 16px 18px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: inherit;
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}

.faq-q:hover {
  color: var(--brand);
  background: var(--grad-soft);
}

.faq-q span.sign {
  color: var(--accent);
  font-size: 20px;
  line-height: 1;
  transition: transform 0.4s var(--ease);
}

.faq-item.open .faq-q span.sign {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease), padding 0.45s var(--ease);
  padding: 0 18px;
}

.faq-a p {
  padding-bottom: 14px;
  margin: 0;
}

.faq-item.open .faq-a {
  max-height: 520px;
}

/* ============ 联系 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 26px;
}

.contact-info li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  list-style: none;
}

form.contact label {
  display: block;
  font-size: 14px;
  margin: 10px 0 4px;
  color: var(--muted);
}

form.contact input,
form.contact textarea,
form.contact select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--ink);
  font-family: inherit;
  font-size: 15px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

form.contact input:focus,
form.contact textarea:focus,
form.contact select:focus {
  outline: none;
  border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(122, 158, 126, 0.22);
}

form.contact button {
  margin-top: 14px;
  background: var(--grad-brand);
  color: #f2e8cf;
  border: 0;
  padding: 12px 26px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  box-shadow: 0 8px 22px rgba(47, 93, 80, 0.28);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), filter 0.35s var(--ease);
}

form.contact button:hover {
  transform: translateY(-3px);
  filter: brightness(1.1);
  box-shadow: 0 14px 32px rgba(47, 93, 80, 0.4);
}

/* ============ 页脚 ============ */
footer.site {
  background: linear-gradient(160deg, #16211c 0%, #1d2b25 52%, #24352e 100%);
  color: #cfd8d2;
  padding: 48px 0 24px;
  font-size: 14.5px;
  position: relative;
  overflow: hidden;
}

footer.site::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-accent);
}

footer.site a {
  color: #cfd8d2;
  transition: color 0.3s var(--ease), padding-left 0.3s var(--ease);
}

footer.site a:hover {
  color: var(--accent-2);
  text-decoration: none;
  padding-left: 3px;
}

footer.site h4 {
  color: #f2e8cf;
  font-size: 15px;
  margin: 0 0 12px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 26px;
}

.foot-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.foot-grid li {
  margin-bottom: 8px;
}

.copy {
  border-top: 1px solid #33443c;
  margin-top: 30px;
  padding-top: 18px;
  text-align: center;
  color: #9fb0a7;
  font-size: 13px;
}

/* ============ 返回顶部 ============ */
#toTop {
  position: fixed;
  right: 18px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 0;
  background: var(--grad-brand);
  color: #f2e8cf;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-hover);
  display: none;
  z-index: 80;
  transition: transform 0.35s var(--ease), filter 0.35s var(--ease);
}

#toTop:hover {
  transform: translateY(-4px) scale(1.08);
  filter: brightness(1.12);
}

/* ============ 滚动动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .g4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .g3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .slide {
    grid-template-columns: 1fr;
    padding: 44px 20px;
  }
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .hero-nav {
    display: none;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }
  .menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-glass);
    -webkit-backdrop-filter: blur(18px) saturate(160%);
    backdrop-filter: blur(18px) saturate(160%);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-hover);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
  }
  .menu.open {
    display: flex;
  }
  .menu a {
    padding: 12px 14px;
  }
  .hamburger {
    display: inline-block;
  }
  .g2,
  .g3,
  .g4,
  .articles {
    grid-template-columns: 1fr;
  }
  .foot-grid {
    grid-template-columns: 1fr;
  }
  .searchbox input {
    width: 110px;
  }
  section {
    padding: 42px 0;
  }
  .card {
    padding: 18px;
  }
}

@media (max-width: 420px) {
  .topbar .tb-right {
    gap: 10px;
  }
  .searchbox input {
    width: 84px;
  }
  .brand b {
    font-size: 18px;
  }
}

/* ============ 无障碍与动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

::selection {
  background: rgba(201, 162, 39, 0.32);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}