/* ==========================================================
   ACFUN官网 | acfan.he.cn | "弹幕梦境" 设计系统
   ----------------------------------------------------------
   核心灵感：弹幕文化 × 新粗野主义 × 暖调编辑部
   色彩系统：珊瑚红 #FF5D5D | 青瓷绿 #00B8A9 | 琥珀黄 #FFCB47
   背景基调：奶油白 #FFF8F0 | 焦糖米 #FFEDE0
   ========================================================== */

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: #FFF8F0;
  color: #2D2A32;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: #FFCB47;
  color: #2D2A32;
}

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #FFEDE0;
}
::-webkit-scrollbar-thumb {
  background: #FF5D5D;
  border-radius: 6px;
  border: 2px solid #FFEDE0;
}

/* ---------- 弹幕动画关键帧 ---------- */
@keyframes danmaku-right {
  0%   { transform: translateX(0); }
  100% { transform: translateX(120vw); }
}
@keyframes danmaku-left {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-120vw); }
}
@keyframes float-bob {
  0%, 100% { transform: translateY(0) rotate(1.5deg); }
  50%      { transform: translateY(-14px) rotate(-1deg); }
}
@keyframes pulse-badge {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.08); }
}

/* ---------- 核心布局 ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}
.section:nth-child(even) {
  background-color: #FFEDE0;
  background-image: radial-gradient(rgba(45,42,50,0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}
.section:nth-child(odd) {
  background: #FFF8F0;
  background-image: radial-gradient(rgba(0,184,169,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ---------- 导航头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 248, 240, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 2px solid #2D2A32;
  box-shadow: 0 4px 20px rgba(45,42,50,0.06);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.35rem;
  text-decoration: none;
  color: #2D2A32;
  letter-spacing: 1px;
  position: relative;
  z-index: 2;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: #FF5D5D;
  color: #fff;
  border: 2px solid #2D2A32;
  box-shadow: 3px 3px 0 #2D2A32;
  position: relative;
}
.logo-icon::before {
  content: 'AC';
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: -1px;
}
.logo-icon::after {
  content: '';
  position: absolute;
  top: -5px;
  right: -5px;
  width: 12px;
  height: 12px;
  background: #FFCB47;
  border: 2px solid #2D2A32;
  border-radius: 50%;
  animation: pulse-badge 2s ease-in-out infinite;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  color: #2D2A32;
  transition: color 0.2s;
  padding: 4px 2px;
  position: relative;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0%;
  height: 3px;
  background: #FF5D5D;
  border-radius: 4px;
  transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.main-nav a:hover {
  color: #FF5D5D;
}
.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 22px !important;
  border-radius: 12px;
  color: #fff !important;
  font-weight: 800;
  background: #00B8A9;
  border: 2px solid #2D2A32;
  box-shadow: 3px 3px 0 #2D2A32;
  transition: all 0.15s ease;
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 #2D2A32;
  color: #fff !important;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 2px solid #2D2A32;
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  box-shadow: 2px 2px 0 #2D2A32;
}
.menu-toggle::before {
  content: '☰';
  font-weight: 900;
  line-height: 1;
}

/* ---------- Hero 弹幕梦境 ---------- */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: 120px 0 60px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #FFF8F0 0%, #FFF0F0 45%, #E7FFFB 100%);
  border-bottom: 2px solid #2D2A32;
}

/* 弹幕装饰文字 */
.hero::before {
  content: '↗ 来了老弟 弹幕之间的浪漫';
  position: absolute;
  top: 18%;
  left: 0;
  font-size: 1.25rem;
  font-weight: 800;
  color: rgba(255, 93, 93, 0.30);
  white-space: nowrap;
  animation: danmaku-right 10s linear infinite;
  pointer-events: none;
  z-index: 0;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
}
.hero::after {
  content: '❤ AC热爱 流鼻血中';
  position: absolute;
  bottom: 28%;
  right: 0;
  font-size: 1.1rem;
  font-weight: 800;
  color: rgba(0, 184, 169, 0.32);
  white-space: nowrap;
  animation: danmaku-left 8s linear infinite;
  pointer-events: none;
  z-index: 0;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
}

.hero .container {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 56px;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero-content {
  flex: 1.1;
  max-width: 640px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 16px;
  border-radius: 30px;
  margin-bottom: 20px;
  background: #FFCB47;
  color: #2D2A32;
  border: 2px solid #2D2A32;
  box-shadow: 3px 3px 0 #2D2A32;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.hero-eyebrow::before {
  content: '✦';
  font-size: 0.9rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 900;
  letter-spacing: -1.5px;
  color: #2D2A32;
  text-decoration: underline wavy;
  text-decoration-color: #FF5D5D;
  text-decoration-thickness: 3px;
  text-underline-offset: 12px;
  text-decoration-skip-ink: auto;
}

.hero p {
  font-size: 1.12rem;
  opacity: 0.72;
  max-width: 540px;
  margin-bottom: 36px;
  line-height: 1.9;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 0.9;
  border-radius: 20px;
  overflow: hidden;
  border: 3px solid #2D2A32;
  box-shadow: 9px 9px 0 #FF5D5D;
  position: relative;
  max-width: 460px;
  transform: rotate(1.5deg);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.4s;
  animation: float-bob 6s ease-in-out infinite;
}
.hero-image:hover {
  transform: rotate(0deg) translateY(-3px);
  box-shadow: 12px 12px 0 #00B8A9;
}
.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  filter: saturate(1.1) contrast(1.05);
}
.hero-image::after {
  content: 'AC ⁂ 珍本';
  position: absolute;
  top: 14px;
  left: -8px;
  background: #FF5D5D;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 900;
  padding: 4px 14px;
  border-radius: 8px;
  border: 2px solid #2D2A32;
  transform: rotate(-6deg);
  box-shadow: 2px 2px 0 #2D2A32;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 14px;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid #2D2A32;
  text-decoration: none;
  transition: all 0.15s cubic-bezier(0.22, 1, 0.36, 1);
}

.btn-primary {
  background: #FF5D5D;
  color: #fff;
  box-shadow: 4px 4px 0 #2D2A32;
}
.btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #2D2A32;
  background: #FF4A4A;
}
.btn-primary:active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 #2D2A32;
}

.btn-outline {
  background: #fff;
  color: #2D2A32;
  border: 2px solid #2D2A32;
  box-shadow: 4px 4px 0 #00B8A9;
}
.btn-outline:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #00B8A9;
}
.btn-outline:active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 #00B8A9;
}

/* ---------- 标签 / 标题 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 2.5px;
  margin-bottom: 14px;
  color: #008F84;
  text-transform: uppercase;
  background: rgba(0, 184, 169, 0.1);
  padding: 6px 16px;
  border-radius: 40px;
  border: 1.5px solid rgba(0, 184, 169, 0.25);
  position: relative;
}
.section-label::before {
  content: '✦';
  color: #FF5D5D;
  font-size: 0.85rem;
}

.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  margin-bottom: 14px;
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1.35;
  color: #2D2A32;
}

.section-desc {
  max-width: 620px;
  opacity: 0.68;
  margin-bottom: 44px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D2A32;
}

/* ---------- 卡片网格 ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.category-card {
  border-radius: 18px;
  padding: 30px 26px;
  border: 2px solid #2D2A32;
  background: #fff;
  box-shadow: 5px 5px 0 #2D2A32;
  position: relative;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s;
  overflow: hidden;
}
.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
}
.category-card:nth-child(3n+1)::before { background: #FF5D5D; }
.category-card:nth-child(3n+2)::before { background: #00B8A9; }
.category-card:nth-child(3n+3)::before { background: #FFCB47; }

.category-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 #2D2A32;
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.45rem;
  border: 2px solid #2D2A32;
}
.category-card:nth-child(3n+1) .card-icon { background: #FFE8E8; }
.category-card:nth-child(3n+2) .card-icon { background: #DDFFF9; }
.category-card:nth-child(3n+3) .card-icon { background: #FFF5D9; }

.category-card h3 {
  font-size: 1.15rem;
  font-weight: 900;
  margin-bottom: 8px;
  color: #2D2A32;
}

.category-card p {
  font-size: 0.88rem;
  opacity: 0.6;
  line-height: 1.7;
  margin-bottom: 18px;
}

.card-link {
  font-weight: 800;
  font-size: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s;
}
.card-link::after {
  content: '→';
  font-size: 1.2rem;
  transition: transform 0.2s;
  line-height: 1;
}
.category-card:nth-child(3n+1) .card-link { color: #FF5D5D; }
.category-card:nth-child(3n+2) .card-link { color: #008F84; }
.category-card:nth-child(3n+3) .card-link { color: #D99E00; }

.category-card:hover .card-link::after {
  transform: translateX(5px);
}

/* ---------- 特性块 ---------- */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature-image {
  border-radius: 20px;
  overflow: hidden;
  border: 3px solid #2D2A32;
  box-shadow: 7px 7px 0 #FFCB47;
  position: relative;
}
.feature-image::before {
  content: '';
  position: absolute;
  top: -12px;
  right: -12px;
  width: 38px;
  height: 38px;
  background: #FF5D5D;
  border: 2px solid #2D2A32;
  border-radius: 50%;
  z-index: 2;
  box-shadow: 2px 2px 0 #2D2A32;
}
.feature-image::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: -12px;
  width: 26px;
  height: 26px;
  background: #00B8A9;
  border: 2px solid #2D2A32;
  border-radius: 8px;
  z-index: 2;
  box-shadow: 2px 2px 0 #2D2A32;
}
.feature-image img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-text {
  position: relative;
}
.feature-text h3 {
  font-size: 1.7rem;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 14px;
  color: #2D2A32;
}
.feature-text p {
  opacity: 0.7;
  line-height: 1.85;
  margin-bottom: 22px;
  font-size: 1.02rem;
}

.feature-list {
  list-style: none;
  margin-top: 8px;
}
.feature-list li {
  padding: 11px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 1.5px dashed rgba(45, 42, 50, 0.12);
}
.feature-list li:last-child {
  border-bottom: none;
}
.feature-list li::before {
  content: '✦';
  font-weight: 900;
  color: #FF5D5D;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: #FFE8E8;
  border-radius: 9px;
  border: 1.5px solid #2D2A32;
  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 28px;
  border-radius: 20px;
  border: 2px solid #2D2A32;
  background: #fff;
  box-shadow: 4px 4px 0 #2D2A32;
  position: relative;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s;
}
.stat-item:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0 #2D2A32;
}
.stat-item::after {
  content: '';
  position: absolute;
  top: 10px;
  right: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid #2D2A32;
}
.stat-item:nth-child(1)::after { background: #FF5D5D; }
.stat-item:nth-child(2)::after { background: #00B8A9; }
.stat-item:nth-child(3)::after { background: #FFCB47; }
.stat-item:nth-child(4)::after { background: #FF9F6E; }

.stat-number {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.2;
  display: inline-block;
  font-variant-numeric: tabular-nums;
}
.stat-item:nth-child(1) .stat-number { color: #FF5D5D; }
.stat-item:nth-child(2) .stat-number { color: #00A293; }
.stat-item:nth-child(3) .stat-number { color: #D99E00; }
.stat-item:nth-child(4) .stat-number { color: #FF8B52; }

.stat-label {
  font-size: 0.88rem;
  opacity: 0.55;
  margin-top: 8px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* ---------- 内容墙 ---------- */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.content-wall-item {
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid #2D2A32;
  background: #fff;
  box-shadow: 4px 4px 0 #2D2A32;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s;
}
.content-wall-item:nth-child(3n+1) { border-top: 5px solid #FF5D5D; }
.content-wall-item:nth-child(3n+2) { border-top: 5px solid #00B8A9; }
.content-wall-item:nth-child(3n+3) { border-top: 5px solid #FFCB47; }

.content-wall-item:hover {
  transform: rotate(-1.2deg) translateY(-4px);
  box-shadow: 8px 8px 0 #FF5D5D;
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  border-bottom: 2px solid #2D2A32;
}

.content-wall-body {
  padding: 22px 24px;
}
.content-wall-body h4 {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: #2D2A32;
}
.content-wall-body p {
  font-size: 0.84rem;
  opacity: 0.55;
  line-height: 1.7;
}

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

.faq-item {
  border: 2px solid #2D2A32;
  border-radius: 14px;
  margin-bottom: 16px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  box-shadow: 3px 3px 0 #2D2A32;
  transition: box-shadow 0.2s ease;
}
.faq-item:hover {
  box-shadow: 5px 5px 0 #00B8A9;
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 800;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  color: #2D2A32;
  gap: 16px;
}
.faq-item .faq-question::after {
  content: '+';
  font-size: 1.6rem;
  font-weight: 400;
  color: #00B8A9;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  line-height: 1;
  flex-shrink: 0;
}
.faq-item.open .faq-question::after {
  transform: rotate(135deg);
  color: #FF5D5D;
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.68;
  border-top: 1.5px dashed rgba(45, 42, 50, 0.15);
  padding-top: 14px;
  font-size: 0.95rem;
  line-height: 1.85;
}
.faq-item.open .faq-answer {
  display: block;
  animation: fade-in 0.35s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 0.68; transform: translateY(0); }
}

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  padding: 60px 40px;
  text-align: center;
  border-radius: 24px;
  color: #fff;
  background: linear-gradient(135deg, #FF5D5D 0%, #FF8E6E 70%, #FFB36B 100%);
  border: 3px solid #2D2A32;
  box-shadow: 8px 8px 0 #2D2A32;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '▶ 弹幕启动 发射爱心';
  position: absolute;
  top: 24px;
  left: -60px;
  font-size: 0.9rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.3);
  white-space: nowrap;
  animation: danmaku-right 7s linear infinite;
  pointer-events: none;
}
.cta-banner::after {
  content: 'AC/DC ✦ 不迷茫';
  position: absolute;
  bottom: 24px;
  right: -50px;
  font-size: 0.85rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.25);
  white-space: nowrap;
  animation: danmaku-left 9s linear infinite;
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 900;
  margin-bottom: 12px;
  line-height: 1.4;
  position: relative;
  z-index: 2;
  text-shadow: 2px 2px 0 rgba(45, 42, 50, 0.25);
}
.cta-banner p {
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 32px;
  font-size: 1.05rem;
  position: relative;
  z-index: 2;
  text-shadow: 1px 1px 0 rgba(45, 42, 50, 0.15);
}

.cta-banner .btn-primary {
  background: #fff;
  color: #FF5D5D;
  box-shadow: 4px 4px 0 #2D2A32;
  border: 2px solid #2D2A32;
  position: relative;
  z-index: 2;
  font-size: 1rem;
  padding: 16px 40px;
}
.cta-banner .btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #2D2A32;
  background: #FFF5EA;
}

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 64px 0 28px;
  background: #FFEDE0;
  background-image: radial-gradient(rgba(45,42,50,0.04) 1px, transparent 1px);
  background-size: 22px 22px;
  color: #2D2A32;
  border-top: 3px solid #2D2A32;
  position: relative;
}

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

.footer-brand .logo {
  margin-bottom: 18px;
  color: #2D2A32;
}
.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.65;
  max-width: 280px;
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 0.98rem;
  font-weight: 800;
  margin-bottom: 18px;
  color: #2D2A32;
  position: relative;
  display: inline-block;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 3px;
  background: #FF5D5D;
  border-radius: 3px;
}

.footer-col ul {
  list-style: none;
}
.footer-col li {
  padding: 5px 0;
}
.footer-col a {
  text-decoration: none;
  color: rgba(45, 42, 50, 0.7);
  font-size: 0.9rem;
  transition: color 0.2s, padding-left 0.2s;
  display: inline-block;
}
.footer-col a:hover {
  color: #FF5D5D;
  padding-left: 5px;
}

.footer-bottom {
  border-top: 2px solid rgba(45, 42, 50, 0.15);
  margin-top: 44px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.65;
  position: relative;
}
.footer-bottom::before {
  content: '◈';
  display: block;
  font-size: 1.2rem;
  margin-bottom: 4px;
  color: #00B8A9;
}

/* ---------- 工具类 ---------- */
.text-accent {
  color: #FF5D5D;
  font-weight: 800;
}
.text-center {
  text-align: center;
}
.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.68;
  text-align: center;
  line-height: 1.85;
}
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ---------- 响应式适配 ---------- */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    gap: 48px;
  }
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-image {
    max-width: 100%;
    margin: 0 8px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .feature-block {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .feature-block {
    grid-template-columns: 1fr;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .main-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #FFF8F0;
    padding: 24px;
    gap: 18px;
    border-bottom: 2px solid #2D2A32;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  }
  .main-nav.open {
    display: flex;
    align-items: flex-start;
  }
  .nav-cta {
    display: inline-flex;
  }
  .menu-toggle {
    display: flex;
  }
  .hero {
    padding: 100px 0 48px;
    min-height: auto;
  }
  .hero h1 {
    font-size: 2.1rem;
    text-underline-offset: 8px;
  }
  .section {
    padding: 56px 0;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .cta-banner {
    padding: 44px 24px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .btn {
    justify-content: center;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero p {
    font-size: 0.98rem;
  }
  .stat-number {
    font-size: 1.8rem;
  }
  .container {
    padding: 0 18px;
  }
  .cta-banner {
    padding: 36px 18px;
  }
  .cta-banner h2 {
    font-size: 1.5rem;
  }
  .site-footer {
    padding: 48px 0 24px;
  }
}