/* ============================================================
   51吃瓜网站 - 全局样式表
   主题：娱乐吃瓜资讯 · 响应式设计 · SEO友好
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --color-primary: #ff5a36;
  --color-primary-dark: #e64520;
  --color-secondary: #8a2be2;
  --color-accent: #ffb347;
  --color-dark: #1a1425;
  --color-dark-2: #241b36;
  --color-text: #3a3348;
  --color-text-light: #6b6478;
  --color-bg: #faf7f5;
  --color-white: #ffffff;
  --color-border: #eee6e1;
  --gradient-main: linear-gradient(135deg, #ff5a36 0%, #ff8a5c 45%, #8a2be2 100%);
  --shadow-sm: 0 2px 8px rgba(26, 20, 37, 0.08);
  --shadow-md: 0 6px 24px rgba(26, 20, 37, 0.12);
  --shadow-lg: 0 12px 40px rgba(26, 20, 37, 0.18);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-stack: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --container-width: 1200px;
  --transition: all 0.3s ease;
}

/* ---------- 重置与基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
}

.container {
  width: min(100% - 2rem, var(--container-width));
  margin-inline: auto;
}

.section-padding {
  padding: 4.5rem 0;
}

.text-center {
  text-align: center;
}

/* ---------- 通用标题 ---------- */
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
  position: relative;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
}

.section-head {
  text-align: center;
  margin-bottom: 3rem;
}

.section-head .section-title::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-main);
  margin: 0.75rem auto 0;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  transition: var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-main);
  color: var(--color-white);
  box-shadow: 0 4px 18px rgba(255, 90, 54, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(255, 90, 54, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.7);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

/* ============================================================
   头部导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 20, 37, 0.96);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-white);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--gradient-main);
  color: var(--color-white);
  font-size: 1.2rem;
  font-weight: 900;
  flex-shrink: 0;
}

.brand em {
  font-style: normal;
  background: linear-gradient(90deg, #ffb347, #ff5a36);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link {
  display: block;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 600;
  font-size: 0.98rem;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-white);
  background: rgba(255, 90, 54, 0.25);
}

.nav-cta {
  margin-left: 0.75rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  color: var(--color-white);
  font-size: 1.6rem;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   Hero 主视觉
   ============================================================ */
.hero {
  position: relative;
  background: var(--gradient-main);
  color: var(--color-white);
  padding: 5.5rem 0 6.5rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -140px;
  left: -60px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: rgba(138, 43, 226, 0.28);
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 3rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 1.2rem;
  text-shadow: 0 3px 20px rgba(0, 0, 0, 0.18);
}

.hero h1 span {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 0 0.4em;
  border-radius: 10px;
}

.hero p {
  font-size: 1.1rem;
  line-height: 1.85;
  opacity: 0.94;
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
}

.hero-stat strong {
  display: block;
  font-size: 1.7rem;
  font-weight: 900;
}

.hero-stat span {
  font-size: 0.9rem;
  opacity: 0.85;
}

.hero-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: rotate(1.5deg);
  border: 5px solid rgba(255, 255, 255, 0.55);
}

.hero-visual img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

/* 英雄区装饰贴纸 */
.hero-badge {
  position: absolute;
  background: var(--color-white);
  color: var(--color-primary);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
}

.hero-badge-1 {
  top: 6%;
  right: 6%;
  transform: rotate(8deg);
}

.hero-badge-2 {
  bottom: 12%;
  left: 40%;
  transform: rotate(-6deg);
  color: var(--color-secondary);
}

/* ============================================================
   特性区 Features
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.9rem 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-top: 4px solid transparent;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-top-color: var(--color-primary);
}

.feature-icon {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(255, 90, 54, 0.12), rgba(138, 43, 226, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 1.1rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
}

/* ============================================================
   资讯卡片 / 通用卡片
   ============================================================ */
.card-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.card-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--gradient-main);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
}

.card-body {
  padding: 1.4rem 1.4rem 1.6rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-body h3 {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.55rem;
  line-height: 1.5;
}

.card-body h3 a:hover {
  color: var(--color-primary);
}

.card-body p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 0.82rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 0.85rem;
}

.card-meta .author {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.card-meta .author::before {
  content: "◆";
  color: var(--color-primary);
  font-size: 0.7rem;
}

/* 双栏内容区 */
.split-section {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.split-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.split-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

/* ============================================================
   Services 服务介绍
   ============================================================ */
.services {
  background: var(--color-white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.service-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.8rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.service-item:hover::before {
  transform: scaleX(1);
}

.service-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.service-no {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 1px;
  margin-bottom: 0.75rem;
}

.service-item h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.service-item p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 1.1rem;
}

.service-link {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.service-link::after {
  content: "→";
  transition: transform 0.3s ease;
}

.service-link:hover::after {
  transform: translateX(4px);
}

/* ============================================================
   CTA 行动号召
   ============================================================ */
.cta {
  background: var(--color-dark-2);
  position: relative;
  overflow: hidden;
  color: var(--color-white);
  text-align: center;
}

.cta::before,
.cta::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 54, 0.25), transparent 70%);
}

.cta::before {
  width: 380px;
  height: 380px;
  top: -160px;
  left: -100px;
}

.cta::after {
  width: 460px;
  height: 460px;
  bottom: -200px;
  right: -120px;
  background: radial-gradient(circle, rgba(138, 43, 226, 0.3), transparent 70%);
}

.cta-inner {
  position: relative;
  z-index: 2;
}

.cta h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 1rem;
}

.cta p {
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 2rem;
  opacity: 0.88;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.72);
  padding: 3.5rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}

.footer-brand {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 0.9rem;
}

.footer-col h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer-col ul li {
  margin-bottom: 0.5rem;
}

.footer-col ul a {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.65);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.4rem 0;
  font-size: 0.88rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================================
   分页
   ============================================================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 0.9rem;
  border-radius: 10px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-text);
}

.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination .current {
  background: var(--gradient-main);
  color: var(--color-white);
  border-color: transparent;
}

/* ============================================================
   分类筛选
   ============================================================ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.5rem 1.4rem;
  border-radius: 999px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-text);
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active {
  background: var(--gradient-main);
  color: var(--color-white);
  border-color: transparent;
}

/* ============================================================
   资讯详情页
   ============================================================ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin: 1.5rem 0;
}

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

.breadcrumb .sep {
  color: var(--color-border);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2.5rem;
  align-items: start;
}

.article-main {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 2.5rem;
}

.article-header h1 {
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1.4;
  margin-bottom: 1rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  font-size: 0.88rem;
  color: var(--color-text-light);
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.6rem;
}

.article-hero-img {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 1.8rem;
}

.article-hero-img img {
  width: 100%;
  max-height: 460px;
  object-fit: cover;
}

.article-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-dark);
  margin: 2rem 0 0.9rem;
  padding-left: 0.9rem;
  border-left: 4px solid var(--color-primary);
}

.article-content h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-dark);
  margin: 1.6rem 0 0.7rem;
}

.article-content p {
  margin-bottom: 1.1rem;
  line-height: 1.9;
}

.article-content ul,
.article-content ol {
  margin: 0 0 1.2rem 1.4rem;
  line-height: 1.9;
}

.article-content ul li {
  list-style: disc;
}

.article-content ol li {
  list-style: decimal;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--color-border);
}

.article-tags span {
  background: var(--color-bg);
  border-radius: 999px;
  padding: 0.3rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.article-nav a {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  font-size: 0.92rem;
  color: var(--color-dark);
}

.article-nav a:hover {
  background: rgba(255, 90, 54, 0.08);
  color: var(--color-primary);
}

.article-nav .prev {
  text-align: left;
}

.article-nav .next {
  text-align: right;
}

.article-nav .label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

/* 侧边栏 */
.sidebar {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.sidebar-box {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
}

.sidebar-box h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 1.1rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--color-border);
}

.sidebar-box h3::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--gradient-main);
  margin-right: 0.5rem;
}

.sidebar-list li {
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--color-border);
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list a {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.5;
}

.sidebar-list a:hover {
  color: var(--color-primary);
}

.sidebar-list .date {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

/* ============================================================
   产品/价格卡片
   ============================================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 2.2rem 2rem;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

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

.pricing-card.highlight {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: scale(1.03);
}

.pricing-card.highlight:hover {
  transform: scale(1.03) translateY(-6px);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 1.1rem;
  border-radius: 999px;
  white-space: nowrap;
}

.pricing-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.6rem;
}

.pricing-price {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 0.3rem;
}

.pricing-price small {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-light);
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 1.3rem;
}

.pricing-features {
  text-align: left;
  margin-bottom: 1.6rem;
}

.pricing-features li {
  padding: 0.45rem 0 0.45rem 1.7rem;
  position: relative;
  font-size: 0.93rem;
}

.pricing-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 900;
}

/* ============================================================
   表单
   ============================================================ */
.contact-form {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 2.2rem;
}

.form-group {
  margin-bottom: 1.3rem;
}

.form-group label {
  display: block;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-dark);
  margin-bottom: 0.45rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.12);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.form-hint {
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.form-success {
  display: none;
  background: #e8f8ef;
  color: #15803d;
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.2rem;
  margin-bottom: 1.3rem;
  font-weight: 700;
  font-size: 0.95rem;
}

.form-success.show {
  display: block;
}

/* 联系信息 */
.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.contact-info-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-info-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.contact-info-item h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.3rem;
}

.contact-info-item p {
  font-size: 0.92rem;
  color: var(--color-text-light);
}

/* ============================================================
   FAQ 折叠面板
   ============================================================ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  margin-bottom: 0.9rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.open {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-dark);
  gap: 1rem;
}

.faq-question .icon {
  font-size: 1.3rem;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 1.4rem 1.2rem;
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.85;
}

/* ============================================================
   时间轴（发展历程）
   ============================================================ */
.timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 3px;
  background: var(--gradient-main);
}

.timeline-item {
  position: relative;
  padding: 0 0 2rem 1.6rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.85rem;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-white);
  border: 4px solid var(--color-primary);
}

.timeline-item h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 0.3rem;
}

.timeline-item .time {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.timeline-item p {
  font-size: 0.93rem;
  color: var(--color-text-light);
}

/* 团队 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.team-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.team-avatar {
  width: 84px;
  height: 84px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-border);
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-dark);
}

.team-card .role {
  font-size: 0.86rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.team-card p {
  font-size: 0.86rem;
  color: var(--color-text-light);
}

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--gradient-main);
  color: var(--color-white);
  font-size: 1.3rem;
  box-shadow: var(--shadow-md);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 90;
  transition: var(--transition);
}

.back-top.show {
  display: flex;
}

.back-top:hover {
  transform: translateY(-3px);
}

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

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

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

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

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

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-visual {
    transform: none;
  }

  .split-section {
    grid-template-columns: 1fr;
  }

  .split-media img {
    height: 300px;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

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

@media (max-width: 768px) {
  .section-padding {
    padding: 3.2rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-dark-2);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0.3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(-140%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s ease, opacity 0.35s ease, visibility 0.35s;
    box-shadow: var(--shadow-lg);
  }

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

  .nav-link {
    padding: 0.85rem 1rem;
    border-radius: 10px;
  }

  .nav-cta {
    margin: 0.4rem 0 0;
  }

  .features-grid,
  .card-list,
  .services-grid,
  .pricing-grid,
  .team-grid,
  .contact-info-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }

  .hero {
    padding: 3.8rem 0 4.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 1.2rem;
  }

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

  .article-main {
    padding: 1.5rem;
  }

  .article-nav {
    grid-template-columns: 1fr;
  }

  .pricing-card.highlight {
    transform: none;
  }

  .pricing-card.highlight:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 480px) {
  .brand {
    font-size: 1.05rem;
  }

  .brand-badge {
    width: 34px;
    height: 34px;
  }

  .btn {
    padding: 0.65rem 1.3rem;
    font-size: 0.92rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .card-body h3 {
    font-size: 1rem;
  }
}

/* ---------- 无障碍与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

:focus-visible {
  outline: 3px solid rgba(255, 90, 54, 0.6);
  outline-offset: 2px;
}