/* ============================================
   51吃瓜网ccgg — 夏日甜瓜鲜果派设计系统
   ============================================ */

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

:root {
  --primary: #FF6B6B;
  --primary-soft: #FFE7E7;
  --primary-dark: #E8514F;
  --secondary: #2EC4B6;
  --secondary-soft: #E0FAF6;
  --secondary-dark: #1A9E92;
  --accent: #FFD93D;
  --accent-soft: #FFF8DC;
  --cream: #FFFDF5;
  --text: #2D3436;
  --text-light: #5D6B6A;
  --border: #E8EDEB;
  --light-bg: #F6FBF9;
  --shadow-sm: 0 2px 8px rgba(45, 52, 54, 0.04);
  --shadow-md: 0 8px 24px rgba(255, 107, 107, 0.06);
  --shadow-lg: 0 16px 40px rgba(45, 52, 54, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 999px;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--cream);
  background-image: radial-gradient(rgba(255, 107, 107, 0.025) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--light-bg);
  background-image: radial-gradient(rgba(46, 196, 182, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* ========== 导航 ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 253, 245, 0.88);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid rgba(255, 107, 107, 0.08);
  transition: box-shadow 0.3s ease;
}

.site-header:hover {
  box-shadow: 0 4px 20px rgba(255, 107, 107, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.35rem;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.01em;
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.02);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8787 60%, #2EC4B6 60%, #3DD6C9 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
  position: relative;
  overflow: hidden;
}

.logo-icon::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  position: relative;
  padding: 4px 0;
  transition: color 0.25s ease;
}

.main-nav a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s cubic-bezier(0.65, 0, 0.35, 1);
}

.main-nav a:not(.nav-cta):hover {
  color: var(--primary);
}

.main-nav a:not(.nav-cta):hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  padding: 9px 22px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8787 100%);
  color: #fff !important;
  font-weight: 700;
  font-size: 0.85rem !important;
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.25);
  transition: all 0.3s ease !important;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 107, 107, 0.35);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  z-index: 1001;
  transition: background 0.3s ease;
}

.menu-toggle:hover {
  background: rgba(255, 107, 107, 0.1);
}

.menu-toggle::before,
.menu-toggle::after {
  content: '';
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.menu-toggle::before {
  top: 16px;
  box-shadow: 0 6px 0 var(--text);
}

.menu-toggle::after {
  bottom: 16px;
}

.menu-toggle.open::before {
  box-shadow: none;
  transform: rotate(45deg);
  top: 19px;
  background: var(--primary);
}

.menu-toggle.open::after {
  transform: rotate(-45deg);
  bottom: 19px;
  background: var(--primary);
}

/* ========== Hero ========== */
.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #FFFDF5 0%, #FFEEEF 45%, #DFF8F5 100%);
  padding: 120px 0 60px;
  overflow: hidden;
}

.hero::before {
  content: '🍉';
  position: absolute;
  font-size: 15rem;
  opacity: 0.045;
  right: 2%;
  top: 60%;
  transform: translateY(-50%) rotate(15deg);
  line-height: 1;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary), var(--primary));
  background-size: 300% 100%;
  animation: rainbowMove 8s linear infinite;
}

@keyframes rainbowMove {
  0% { background-position: 0% center; }
  100% { background-position: 300% center; }
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.hero-content::before {
  content: '';
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.15) 0%, transparent 70%);
  top: -60px;
  left: -80px;
  z-index: -1;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  background: rgba(46, 196, 182, 0.12);
  color: var(--secondary-dark);
  border: 1px solid rgba(46, 196, 182, 0.2);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero h1 .text-accent {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero h1 .text-accent::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 10px;
  background: linear-gradient(to top, rgba(255, 217, 61, 0.4), transparent);
  z-index: -1;
  border-radius: 4px;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.7;
  max-width: 560px;
  margin-bottom: 32px;
  color: var(--text-light);
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-image {
  border-radius: 24px;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: rotate(1deg) translateY(8px);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 4px solid rgba(255, 255, 255, 0.7);
}

.hero-image:hover {
  transform: rotate(0deg) translateY(0) scale(1.01);
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: -14px;
  border-radius: 32px;
  border: 2px dashed rgba(255, 107, 107, 0.35);
  z-index: -1;
  pointer-events: none;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  letter-spacing: 0.01em;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
}

.btn-primary {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8787 100%);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 10px 28px rgba(255, 107, 107, 0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--secondary);
  color: var(--secondary-dark);
  box-shadow: 0 0 0 0 rgba(46, 196, 182, 0.2);
}

.btn-outline:hover {
  background: rgba(46, 196, 182, 0.08);
  border-color: var(--secondary-dark);
  box-shadow: 0 0 0 6px rgba(46, 196, 182, 0.08);
}

/* ========== 标签/标题 ========== */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: var(--secondary-soft);
  color: var(--secondary-dark);
  border: 1px solid rgba(46, 196, 182, 0.15);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 14px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.3;
  position: relative;
  display: inline-block;
  padding-left: 16px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 40px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ========== 卡片网格 ========== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.category-card {
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  background: #fff;
  position: relative;
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.category-card:hover {
  transform: translateY(-4px) rotate(-0.5deg);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-soft));
  color: var(--primary);
  transition: transform 0.3s ease;
}

.category-card:hover .card-icon {
  transform: scale(1.1) rotate(-5deg);
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.3s ease;
}

.card-link::after {
  content: '→';
  transition: transform 0.3s ease;
}

.card-link:hover {
  gap: 8px;
}

/* ========== 特性块 ========== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-md);
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.06), transparent 50%);
  border-radius: var(--radius-lg);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.feature-image:hover img {
  transform: scale(1.03);
}

.feature-text {
  padding: 20px 0;
}

.feature-text h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-top: 8px;
  margin-bottom: 12px;
  line-height: 1.3;
}

.feature-list {
  list-style: none;
  margin-top: 20px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-light);
  font-size: 0.95rem;
}

.feature-list li::before {
  content: '✓';
  font-weight: 900;
  color: var(--secondary);
  background: var(--secondary-soft);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  flex-shrink: 0;
}

/* ========== 数据条 ========== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: #fff;
  position: relative;
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stat-item::before {
  content: '';
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.08), transparent 70%);
  top: -20px;
  right: -20px;
  transition: transform 0.4s ease;
}

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

.stat-item:hover::before {
  transform: scale(2.5);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 6px;
  color: var(--text-light);
  font-weight: 500;
}

/* ========== 内容墙 ========== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.content-wall-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

.content-wall-item:hover {
  transform: translateY(-4px) rotate(0.5deg);
  box-shadow: var(--shadow-md);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.content-wall-item:hover img {
  transform: scale(1.05);
}

.content-wall-body {
  padding: 20px;
}

.content-wall-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.4;
}

.content-wall-body p {
  font-size: 0.85rem;
  opacity: 0.6;
  color: var(--text-light);
}

/* ========== FAQ ========== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.faq-item:hover {
  border-color: rgba(255, 107, 107, 0.2);
  box-shadow: var(--shadow-sm);
}

.faq-item .faq-question {
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
  transition: color 0.3s ease;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  line-height: 1;
}

.faq-item .faq-answer {
  padding: 0 22px 20px;
  display: none;
  opacity: 0.7;
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px dashed var(--border);
  margin-top: 0;
  padding-top: 12px;
}

.faq-item.open {
  border-color: rgba(255, 107, 107, 0.3);
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.06);
}

.faq-item.open .faq-question {
  color: var(--primary);
}

.faq-item.open .faq-question::after {
  transform: rotate(135deg);
}

.faq-item.open .faq-answer {
  display: block;
}

/* ========== CTA横幅 ========== */
.cta-banner {
  padding: 64px 24px;
  text-align: center;
  border-radius: var(--radius-lg);
  color: #fff;
  background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.25) 0%, transparent 40%),
              radial-gradient(circle at 20% 100%, rgba(255, 217, 61, 0.2) 0%, transparent 50%),
              linear-gradient(135deg, #FF6B6B, #FF8E8E, #FFA76B);
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(255, 107, 107, 0.25);
}

.cta-banner::before {
  content: '🍉';
  position: absolute;
  font-size: 6rem;
  opacity: 0.12;
  left: 6%;
  top: 50%;
  transform: translateY(-50%) rotate(-20deg);
}

.cta-banner::after {
  content: '🍉';
  position: absolute;
  font-size: 4rem;
  opacity: 0.08;
  right: 8%;
  top: 30%;
  transform: rotate(25deg);
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 12px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  position: relative;
  z-index: 1;
}

.cta-banner p {
  position: relative;
  z-index: 1;
  opacity: 0.92;
  margin-bottom: 28px;
  font-size: 1.05rem;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

/* ========== 页脚 ========== */
.site-footer {
  padding: 56px 0 28px;
  background: linear-gradient(180deg, var(--cream) 0%, #EFF7F4 100%);
  border-top: 2px solid var(--secondary-soft);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  width: 100%;
  height: 20px;
  background: repeating-linear-gradient(
    135deg,
    transparent 0px,
    transparent 12px,
    var(--secondary-soft) 12px,
    var(--secondary-soft) 22px
  );
  opacity: 0.5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  padding-right: 24px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.7;
  color: var(--text-light);
  line-height: 1.7;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text);
}

.footer-col a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.88rem;
  transition: color 0.25s ease, transform 0.25s ease;
}

.footer-col a:hover {
  color: var(--primary);
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid rgba(45, 52, 54, 0.08);
  margin-top: 48px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
  opacity: 0.8;
}

/* ========== 工具类 ========== */
.text-accent {
  color: var(--primary);
  font-weight: 700;
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  color: var(--text-light);
  line-height: 1.7;
  text-align: center;
}

.mt-0 {
  margin-top: 0 !important;
}

.mb-0 {
  margin-bottom: 0 !important;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .hero {
    padding: 100px 0 48px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-image {
    margin-top: 32px;
    width: 85%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feature-image {
    order: -1;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px;
    left: 12px;
    right: 12px;
    background: rgba(255, 253, 245, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 40px rgba(45, 52, 54, 0.12);
    gap: 16px;
    z-index: 999;
    text-align: center;
    border: 1px solid var(--border);
  }

  .main-nav.open a {
    font-size: 1rem;
    padding: 10px 0;
    display: block;
  }

  .main-nav.open .nav-cta {
    margin-top: 8px;
    text-align: center;
  }

  .cta-banner {
    padding: 48px 20px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .hero-buttons .btn {
    justify-content: center;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .cta-banner {
    padding: 40px 16px;
  }

  .cta-banner h2 {
    font-size: 1.6rem;
  }
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--cream);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary-soft), var(--secondary-soft));
  border-radius: 8px;
  border: 2px solid var(--cream);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(255, 107, 107, 0.5), rgba(46, 196, 182, 0.5));
}

/* ========== 选中高亮 ========== */
::selection {
  background: rgba(255, 107, 107, 0.15);
  color: var(--primary-dark);
}

/* ========== 焦点可见性 ========== */
a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(255, 107, 107, 0.4);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ========== 链接通用 hover ========== */
a[href]:not(.btn):not(.nav-cta) {
  transition: color 0.25s ease;
}