/* 梵玢 FBCY 官网 - 主样式（GEO 友好，关键信息为文本） */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;600&display=swap');

:root {
  --color-bg: #faf8f5;
  --color-bg-alt: #f2efe8;
  --color-surface: #ffffff;
  --color-primary: #2c3e2a;
  --color-primary-light: #3d5239;
  --color-accent: #a68b5b;
  --color-accent-soft: #c4ad8a;
  --color-text: #2a2a2a;
  --color-text-muted: #5c5c5c;
  --font-serif: 'Noto Serif SC', serif;
  --font-sans: 'Noto Sans SC', sans-serif;
  --shadow-soft: 0 4px 24px rgba(44, 62, 42, 0.06);
  --shadow-card: 0 8px 32px rgba(44, 62, 42, 0.08);
  --shadow-hover: 0 16px 48px rgba(44, 62, 42, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 72px;
}

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

/* 锁定根字体，避免生产/开发环境 rem 基准不一致 */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* 首屏与滚动时的淡入（GEO：内容仍为可解析文本） */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
}

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

/* 头部 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(44, 62, 42, 0.06);
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-soft);
}

.site-header .inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--color-primary);
  font-family: var(--font-serif);
  font-weight: 600;
}

.site-logo-text {
  font-size: 1.6rem;
}

.site-logo img {
  height: 1.6rem;
  width: auto;
  display: block;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 10px 18px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  background: rgba(44, 62, 42, 0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* 主内容区留出头部高度 */
main {
  padding-top: var(--header-h);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 区块通用 */
.section {
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  color: var(--color-primary);
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0 0 48px;
  max-width: 560px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.6s ease;
}

.btn-primary:hover::after {
  left: 100%;
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
  background: rgba(44, 62, 42, 0.06);
}

/* 页脚 */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.88);
  padding: 56px 0 32px;
}

.site-footer .inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 0.9rem;
  opacity: 0.85;
  margin-bottom: 32px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer-links a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-size: 0.95rem;
  transition: opacity var(--transition);
}

.footer-links a:hover {
  opacity: 0.8;
}

.footer-copy {
  font-size: 0.85rem;
  opacity: 0.7;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.footer-icp {
  font-size: 0.8rem;
  opacity: 0.75;
  margin-top: 8px;
}

.footer-icp a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
}

.footer-icp a:hover {
  text-decoration: underline;
}

/* 首页 Hero：限制最大高度，避免大屏下 85vh 过大导致与开发环境视觉差异 */
.hero {
  position: relative;
  min-height: min(85vh, 720px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.35;
  transition: transform 12s ease-out;
}

.hero:hover .hero-bg {
  transform: scale(1.03);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(250,248,245,0.6) 0%, rgba(250,248,245,0.92) 60%, var(--color-bg) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 48px 24px;
  animation: heroFadeIn 1.2s ease-out forwards;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 6vw, 3.5rem);
  color: var(--color-primary);
  margin: 0 0 16px;
  letter-spacing: 0.04em;
}

.hero-title-text {
  display: inline-block;
}

.hero-title-logo {
  height: 0.92em;
  width: auto;
  display: inline-block;
  vertical-align: middle;
  object-fit: contain;
}

.hero-slogan {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--color-text-muted);
  margin: 0 0 12px;
  font-weight: 400;
}

.hero-tagline {
  font-size: 0.95rem;
  color: var(--color-accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 40px;
}

/* 产品线入口卡片 */
.product-line-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.product-line-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid rgba(44, 62, 42, 0.06);
}

.product-line-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.product-line-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-primary);
  margin: 0 0 8px;
}

.product-line-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* 明星产品 */
.star-products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.star-product-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition);
}

.star-product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.star-product-card .img-wrap {
  aspect-ratio: 1;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.star-product-card .img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 6s ease-out;
}

.star-product-card:hover .img-wrap img {
  transform: scale(1.05);
}

.star-product-card .body {
  padding: 24px;
}

.star-product-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-primary);
  margin: 0 0 12px;
}

.star-product-card ul {
  margin: 0;
  padding-left: 1.2em;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* 产品中心页 - 系列区块 */
.series-section {
  padding: 64px 0;
  border-bottom: 1px solid rgba(44, 62, 42, 0.08);
}

.series-section:last-of-type {
  border-bottom: none;
}

.series-section h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  color: var(--color-primary);
  margin: 0 0 32px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent-soft);
  display: inline-block;
}

/* 产品卡片（可展开详情） */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(44, 62, 42, 0.06);
  transition: box-shadow var(--transition);
}

.product-card .card-head {
  display: flex;
  align-items: stretch;
  gap: 20px;
  padding: 24px;
  cursor: pointer;
  transition: background var(--transition);
}

.product-card .card-head:hover {
  background: rgba(44, 62, 42, 0.02);
}

.product-card .thumb {
  width: 100px;
  min-width: 100px;
  height: 100px;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  overflow: hidden;
}

.product-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card .head-text {
  flex: 1;
  min-width: 0;
}

.product-card .head-text h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin: 0 0 8px;
}

.product-card .head-text .tagline {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
}

.product-card .expand-icon {
  align-self: center;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--color-accent);
}

.product-card.expanded .expand-icon {
  transform: rotate(180deg);
}

.product-card .card-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--transition);
}

.product-card .card-detail-inner {
  padding: 0 24px 24px;
  border-top: 1px solid rgba(44, 62, 42, 0.06);
}

.product-card .detail-section {
  margin-top: 20px;
}

.product-card .detail-section:first-child {
  margin-top: 20px;
}

.product-card .detail-section h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-card .detail-section ul,
.product-card .detail-section ol {
  margin: 0;
  padding-left: 1.2em;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* 品牌页 */
.brand-hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}

.brand-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  color: var(--color-primary);
  margin: 0 0 16px;
}

.brand-hero .slogan {
  font-size: 1.2rem;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.content-block {
  margin-bottom: 56px;
}

.content-block h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin: 0 0 20px;
}

.content-block p {
  margin: 0 0 16px;
  color: var(--color-text);
  max-width: 720px;
}

.position-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

@media (max-width: 768px) {
  .position-cards {
    grid-template-columns: 1fr;
  }
}

.position-card {
  background: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.position-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-accent);
  margin: 0 0 12px;
}

.position-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

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

.advantage-list li {
  padding: 14px 0;
  padding-left: 28px;
  position: relative;
  border-bottom: 1px solid rgba(44, 62, 42, 0.06);
}

.advantage-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* FAQ 页 */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(44, 62, 42, 0.08);
}

.faq-item .q {
  padding: 20px 0;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color var(--transition);
}

.faq-item .q:hover {
  color: var(--color-accent);
}

.faq-item .q .icon {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--color-accent);
}

.faq-item.expanded .q .icon {
  transform: rotate(180deg);
}

.faq-item .a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--transition);
}

.faq-item.expanded .a {
  max-height: 800px;
}

.faq-item .a-inner {
  padding: 0 0 24px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* 服务与保障 */
.service-intro {
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 40px;
  max-width: 640px;
}

.channel-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.channel-list li {
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(44, 62, 42, 0.06);
}

.channel-list .platform {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.channel-list .name {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* 占位图（无图产品） */
.thumb.placeholder {
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, #e8e4dc 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

/* 响应式 */
@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: 24px;
    box-shadow: var(--shadow-card);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

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

  .nav-toggle {
    display: flex;
  }

  .section {
    padding: 56px 0;
  }
}