/* ============================================================
   噜噜社·在线版 — 全局样式
   主题：深色电影感 + 暖色强调
   ============================================================ */

:root {
  --bg-deep: #0b0d12;
  --bg-body: #10131a;
  --bg-card: #171b24;
  --bg-card-hover: #1d2230;
  --bg-nav: rgba(11, 13, 18, 0.86);
  --border: #262c3a;
  --text-main: #f4efe6;
  --text-sub: #a6adbc;
  --text-dim: #70788c;
  --accent: #e8a33d;
  --accent-soft: #ffb65c;
  --accent-hot: #ff7a45;
  --gradient: linear-gradient(135deg, #e8a33d 0%, #ff7a45 100%);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1200px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-display: "STZhongsong", "SimSun", "Noto Serif SC", serif;
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-body);
  color: var(--text-main);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul {
  list-style: none;
}

.container {
  width: min(var(--max-width), 92%);
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
  position: relative;
}

.section-eyebrow::before,
.section-eyebrow::after {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--gradient);
  vertical-align: middle;
  margin: 0 10px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-sub);
  font-size: 16px;
}

/* ---------- 导航栏 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  font-size: 18px;
  color: #0b0d12;
  box-shadow: 0 6px 18px rgba(232, 163, 61, 0.35);
}

.brand-text .brand-sub {
  display: block;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--text-dim);
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  color: var(--text-sub);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
  background: rgba(232, 163, 61, 0.14);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-sub);
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition);
  display: grid;
  place-items: center;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text-main);
  font-size: 18px;
  cursor: pointer;
  place-items: center;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 180px 0 120px;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(232, 163, 61, 0.16), transparent 60%),
    radial-gradient(900px 500px at 5% 110%, rgba(255, 122, 69, 0.12), transparent 55%),
    var(--bg-deep);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(600px 400px at 70% 30%, #000 20%, transparent 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid rgba(232, 163, 61, 0.4);
  background: rgba(232, 163, 61, 0.1);
  color: var(--accent-soft);
  font-size: 13px;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
  animation: fadeUp 0.8s ease both;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin-bottom: 22px;
  animation: fadeUp 0.9s 0.08s ease both;
}

.hero-title .hl {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-sub);
  max-width: 540px;
  margin-bottom: 36px;
  animation: fadeUp 0.9s 0.16s ease both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeUp 0.9s 0.24s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn-primary {
  background: var(--gradient);
  color: #0b0d12;
  box-shadow: 0 12px 32px rgba(232, 163, 61, 0.32);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(255, 122, 69, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
}

.hero-visual {
  position: relative;
  animation: fadeIn 1.1s 0.2s ease both;
}

.hero-film {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transform: perspective(1200px) rotateY(-7deg);
  transition: transform var(--transition);
}

.hero-film:hover {
  transform: perspective(1200px) rotateY(0deg) scale(1.01);
}

.hero-film img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-stats {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 28px;
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.stat {
  text-align: center;
  padding: 0 18px;
  border-right: 1px solid var(--border);
}

.stat:last-child {
  border-right: none;
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 26px;
  color: var(--accent);
}

.stat span {
  font-size: 12px;
  color: var(--text-dim);
}

/* ---------- 特性 ---------- */
.features {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 26px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(232, 163, 61, 0.5);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.4);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(232, 163, 61, 0.14);
  border: 1px solid rgba(232, 163, 61, 0.3);
  display: grid;
  place-items: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 19px;
  margin-bottom: 12px;
  font-family: var(--font-display);
}

.feature-card p {
  color: var(--text-sub);
  font-size: 14px;
}

/* ---------- 内容区 ---------- */
.content-section {
  background: var(--bg-body);
}

.section-tabs {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.tab-btn {
  padding: 10px 22px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-sub);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--gradient);
  color: #0b0d12;
  border-color: transparent;
  font-weight: 600;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-8px);
  border-color: rgba(232, 163, 61, 0.45);
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.42);
}

.card-media {
  position: relative;
  overflow: hidden;
}

.card-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card:hover .card-media img {
  transform: scale(1.06);
}

.card-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--gradient);
  color: #0b0d12;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.card-body {
  padding: 22px 22px 26px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-body h3 {
  font-size: 18px;
  font-family: var(--font-display);
  margin-bottom: 10px;
  line-height: 1.4;
}

.card-body p {
  color: var(--text-sub);
  font-size: 14px;
  flex: 1;
  margin-bottom: 16px;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-dim);
}

.card-link {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  transition: letter-spacing var(--transition);
}

.card-link:hover {
  letter-spacing: 0.06em;
}

/* ---------- 服务介绍 ---------- */
.services {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.service-item {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), border-color var(--transition);
}

.service-item:hover {
  transform: translateY(-6px);
  border-color: rgba(232, 163, 61, 0.45);
}

.service-num {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 163, 61, 0.7);
  line-height: 1;
}

.service-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.service-item p {
  color: var(--text-sub);
  font-size: 14px;
}

/* ---------- CTA ---------- */
.cta {
  position: relative;
  padding: 110px 0;
  text-align: center;
  background:
    radial-gradient(900px 400px at 50% 0%, rgba(232, 163, 61, 0.18), transparent 65%),
    var(--bg-deep);
  overflow: hidden;
}

.cta h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 18px;
}

.cta p {
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto 34px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: #080a0f;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 44px;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-desc {
  color: var(--text-sub);
  font-size: 14px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 15px;
  margin-bottom: 18px;
  color: var(--text-main);
  letter-spacing: 0.08em;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-sub);
  font-size: 14px;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
}

.newsletter {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.newsletter input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}

.newsletter input:focus {
  border-color: var(--accent);
}

.newsletter button {
  padding: 12px 20px;
  border: none;
  border-radius: 10px;
  background: var(--gradient);
  color: #0b0d12;
  font-weight: 700;
  cursor: pointer;
  transition: filter var(--transition);
}

.newsletter button:hover {
  filter: brightness(1.1);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-dim);
  font-size: 13px;
}

/* ---------- 关于页 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.about-story h2 {
  font-family: var(--font-display);
  font-size: 30px;
  margin-bottom: 20px;
}

.about-story p {
  color: var(--text-sub);
  margin-bottom: 18px;
}

.about-image {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.about-image img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  width: 100%;
}

.timeline {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
  padding-left: 28px;
  border-left: 2px solid rgba(232, 163, 61, 0.4);
}

.timeline-item {
  position: relative;
  padding: 0 0 40px 24px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gradient);
  box-shadow: 0 0 0 5px rgba(232, 163, 61, 0.15);
}

.timeline-year {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.timeline-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-sub);
  font-size: 14px;
}

/* ---------- 产品页 ---------- */
.product-hero {
  background:
    radial-gradient(900px 500px at 20% 0%, rgba(232, 163, 61, 0.14), transparent 60%),
    var(--bg-deep);
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 30px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.price-card:hover {
  transform: translateY(-8px);
  border-color: rgba(232, 163, 61, 0.5);
}

.price-card.hot {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(232, 163, 61, 0.35), var(--shadow);
}

.price-name {
  font-size: 17px;
  margin-bottom: 14px;
  letter-spacing: 0.06em;
  color: var(--text-sub);
}

.price-value {
  font-family: var(--font-display);
  font-size: 46px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 20px;
}

.price-value small {
  font-size: 14px;
  color: var(--text-dim);
  font-family: var(--font-main);
  font-weight: 400;
}

.price-features {
  flex: 1;
  text-align: left;
  margin-bottom: 28px;
}

.price-features li {
  padding: 9px 0 9px 26px;
  position: relative;
  color: var(--text-sub);
  font-size: 14px;
}

.price-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- 新闻页 ---------- */
.news-featured {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 44px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.news-featured:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.news-featured .card-media img {
  aspect-ratio: 16 / 9;
}

.news-featured-body {
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-date {
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.news-featured-body h2 {
  font-family: var(--font-display);
  font-size: 26px;
  margin-bottom: 14px;
  line-height: 1.4;
}

.news-featured-body p {
  color: var(--text-sub);
  margin-bottom: 20px;
}

/* ---------- 新闻详情 ---------- */
.article {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 56px;
}

.article-header {
  text-align: center;
  margin-bottom: 40px;
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.4;
  margin: 16px 0 12px;
}

.article-meta {
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.article-cover {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 36px;
}

.article-cover img {
  aspect-ratio: 21 / 9;
  object-fit: cover;
  width: 100%;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 23px;
  margin: 36px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
}

.article-body h3 {
  font-size: 18px;
  margin: 28px 0 12px;
}

.article-body p {
  color: var(--text-sub);
  margin-bottom: 16px;
  font-size: 15.5px;
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  background: rgba(232, 163, 61, 0.08);
  padding: 18px 22px;
  margin: 24px 0;
  border-radius: 0 12px 12px 0;
  color: var(--text-main);
  font-style: italic;
}

.article-body ul {
  margin: 0 0 16px 20px;
  list-style: disc;
}

.article-body li {
  color: var(--text-sub);
  margin-bottom: 8px;
}

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}

.contact-info-item {
  display: flex;
  gap: 18px;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  transition: border-color var(--transition);
}

.contact-info-item:hover {
  border-color: rgba(232, 163, 61, 0.45);
}

.contact-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(232, 163, 61, 0.14);
  display: grid;
  place-items: center;
  font-size: 20px;
}

.contact-info-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-info-item p {
  color: var(--text-sub);
  font-size: 14px;
}

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text-sub);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-body);
  color: var(--text-main);
  font-size: 14px;
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-hint {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 6px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 24px 26px;
  margin-bottom: 16px;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(232, 163, 61, 0.4);
}

.faq-item h3 {
  font-size: 17px;
  margin-bottom: 10px;
  position: relative;
  padding-right: 24px;
}

.faq-item h3::after {
  content: "＋";
  position: absolute;
  right: 0;
  color: var(--accent);
}

.faq-item p {
  color: var(--text-sub);
  font-size: 14px;
}

.map-placeholder {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-card);
}

.map-placeholder img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.75);
}

/* ---------- 面包屑 / 子页 hero ---------- */
.page-hero {
  padding: 168px 0 84px;
  background:
    radial-gradient(1000px 480px at 80% 0%, rgba(232, 163, 61, 0.14), transparent 60%),
    var(--bg-deep);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 50px);
  margin-bottom: 16px;
}

.page-hero p {
  color: var(--text-sub);
  max-width: 640px;
  margin: 0 auto;
  font-size: 16px;
}

.breadcrumb {
  display: inline-flex;
  gap: 10px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}

.breadcrumb a {
  color: var(--accent);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 32px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient);
  color: #0b0d12;
  border: none;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 90;
  box-shadow: 0 10px 28px rgba(232, 163, 61, 0.35);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 动画 ---------- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 560px;
  }

  .about-grid,
  .contact-grid,
  .news-featured {
    grid-template-columns: 1fr;
  }

  .article {
    padding: 36px 30px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    padding: 16px 6%;
    gap: 4px;
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    width: 100%;
    text-align: center;
    padding: 12px;
  }

  .features-grid,
  .grid-3,
  .grid-4,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    position: static;
    transform: none;
    margin-top: 28px;
    justify-content: center;
    padding: 14px 8px;
  }

  .stat {
    padding: 0 10px;
  }

  .stat strong {
    font-size: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .back-top {
    right: 16px;
    bottom: 20px;
  }
}

@media (max-width: 480px) {
  .brand-text .brand-sub {
    display: none;
  }

  .hero {
    padding: 140px 0 84px;
  }

  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ---------- 明亮模式（备用） ---------- */
body.light {
  --bg-deep: #f3efe6;
  --bg-body: #faf7f0;
  --bg-card: #ffffff;
  --bg-card-hover: #fffdf7;
  --bg-nav: rgba(250, 247, 240, 0.88);
  --border: #e4ddcf;
  --text-main: #241d12;
  --text-sub: #5c564c;
  --text-dim: #8a8376;
  --shadow: 0 18px 48px rgba(60, 50, 30, 0.12);
}

body.light .site-footer {
  background: #efe9dc;
}