/* ============================================================
   喵趣漫画 - 官网样式表 v2
   Domain: miaoquapp.com.cn
   Theme: 明亮卡通 / Bright Cartoon Cat
   ============================================================ */

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

:root {
  /* 明亮卡通配色 */
  --color-primary: #ff7a45;
  --color-primary-light: #ff9a6b;
  --color-primary-dark: #e85d2a;
  --color-accent: #ffb347;
  --color-pink: #ff8fab;
  --color-purple: #a78bfa;

  --color-bg: #fff5ee;
  --color-bg-soft: #fffaf5;
  --color-bg-card: #ffffff;
  --color-bg-warm: #fff0e6;

  --color-text: #2d2a32;
  --color-text-secondary: #6b6575;
  --color-text-muted: #9e98a8;
  --color-text-inverse: #ffffff;

  --color-border: #ffe4d6;
  --color-border-light: #fff0e6;

  --gradient-primary: linear-gradient(135deg, #ff7a45 0%, #ff5e62 100%);
  --gradient-accent: linear-gradient(135deg, #ffb347 0%, #ff7a45 100%);
  --gradient-warm: linear-gradient(135deg, #fff5ee 0%, #ffe8d9 100%);
  --gradient-text: linear-gradient(135deg, #ff7a45 0%, #ff5e62 100%);

  --shadow-sm: 0 2px 12px rgba(255, 122, 69, 0.08);
  --shadow-md: 0 8px 30px rgba(255, 122, 69, 0.12);
  --shadow-lg: 0 20px 50px rgba(255, 122, 69, 0.18);
  --shadow-glow: 0 0 40px rgba(255, 122, 69, 0.25);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;

  --nav-height: 72px;
  --container-max: 1200px;
  --container-padding: 1.5rem;

  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section { padding: 5rem 0; position: relative; }

.section-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--color-bg-warm);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 580px;
  margin: 0 auto 3rem;
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 122, 69, 0.35);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255, 122, 69, 0.5);
  color: #fff;
}

.btn-outline {
  background: #fff;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-3px);
}

.btn-lg { padding: 1.05rem 2.4rem; font-size: 1.05rem; }
.btn .btn-icon { width: 20px; height: 20px; flex-shrink: 0; }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: all var(--transition-base);
  background: rgba(255, 245, 238, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
}
.logo-img {
  width: 42px; height: 42px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 2px 10px rgba(255, 122, 69, 0.3);
}
.logo-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
  padding: 0.25rem 0;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
  border-radius: 2px;
}
.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: 1rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero区（左右分栏） ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + 2rem);
  padding-bottom: 3rem;
  overflow: hidden;
}

/* 装饰性漂浮元素 */
.hero-decor {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.4;
  z-index: 0;
  pointer-events: none;
}
.hero-decor-1 {
  width: 400px; height: 400px;
  background: #ffb347;
  top: -100px; right: -100px;
  animation: float 8s ease-in-out infinite;
}
.hero-decor-2 {
  width: 300px; height: 300px;
  background: #ff8fab;
  bottom: -50px; left: -80px;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.1); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.1rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  font-weight: 500;
}
.hero-badge .pulse {
  width: 8px; height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulseDot 2s infinite;
}
@keyframes pulseDot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 122, 69, 0.5); }
  50% { box-shadow: 0 0 0 8px rgba(255, 122, 69, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}
.hero-title .emoji { display: inline-block; animation: wiggle 2s ease-in-out infinite; }
@keyframes wiggle {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-mini-features {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.hero-mini-feature {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}
.hero-mini-feature .check {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* Hero右侧图片区 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-phone {
  position: relative;
  width: 280px;
  background: #fff;
  border-radius: 36px;
  padding: 12px;
  box-shadow: var(--shadow-lg);
  border: 3px solid var(--color-border);
  animation: phoneFloat 5s ease-in-out infinite;
}
@keyframes phoneFloat {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-15px) rotate(2deg); }
}
.hero-phone img {
  border-radius: 26px;
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: 18% center;
}

.hero-float-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  animation: cardFloat 4s ease-in-out infinite;
}
.hero-float-card .icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.hero-float-card-1 {
  top: 15%; left: -30px;
  animation-delay: 0s;
}
.hero-float-card-1 .icon { background: #fff0e6; }
.hero-float-card-2 {
  bottom: 20%; right: -30px;
  animation-delay: 1.5s;
}
.hero-float-card-2 .icon { background: #ffe4ec; }
.hero-float-card-3 {
  bottom: -10px; left: 20px;
  animation-delay: 0.8s;
}
.hero-float-card-3 .icon { background: #ede4ff; }

@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 数据横幅 ---------- */
.stats-banner {
  background: var(--gradient-primary);
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}
.stats-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/comic-3.png") center/cover;
  opacity: 0.1;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 1;
}
.stat-item {
  text-align: center;
  color: #fff;
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* ---------- 核心优势（3列大卡片） ---------- */
.advantages {
  background: var(--color-bg-soft);
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.advantage-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all var(--transition-base);
  border: 1px solid var(--color-border-light);
  position: relative;
  overflow: hidden;
}
.advantage-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}
.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}
.advantage-card:hover::before { transform: scaleX(1); }

.advantage-icon {
  width: 72px; height: 72px;
  border-radius: 20px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  background: var(--color-bg-warm);
}
.advantage-card:nth-child(2) .advantage-icon { background: #ffe4ec; }
.advantage-card:nth-child(3) .advantage-icon { background: #ede4ff; }

.advantage-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.advantage-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- 阅读体验（手机mockup + 浮动标签） ---------- */
.experience {
  background: var(--color-bg);
  overflow: hidden;
}
.experience-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.experience-phone {
  position: relative;
  display: flex;
  justify-content: center;
}
.exp-phone {
  width: 300px;
  background: #2d2a32;
  border-radius: 40px;
  padding: 14px;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.exp-phone img {
  border-radius: 28px;
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
  object-position: 18% center;
}
.exp-phone::before {
  content: "";
  position: absolute;
  top: 14px; left: 50%;
  transform: translateX(-50%);
  width: 100px; height: 24px;
  background: #2d2a32;
  border-radius: 0 0 14px 14px;
  z-index: 2;
}

.exp-tag {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 0.8rem 1.1rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  max-width: 180px;
}
.exp-tag .tag-icon {
  width: 32px; height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.exp-tag-1 { top: 10%; left: -20px; }
.exp-tag-1 .tag-icon { background: #fff0e6; }
.exp-tag-2 { top: 40%; right: -30px; }
.exp-tag-2 .tag-icon { background: #ede4ff; }
.exp-tag-3 { bottom: 15%; left: -10px; }
.exp-tag-3 .tag-icon { background: #ffe4ec; }

.experience-content h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.3;
}
.experience-content > p {
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}
.exp-feature-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.exp-feature {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.exp-feature-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.exp-feature-text h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.exp-feature-text p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ---------- 热门漫画（横向滚动） ---------- */
.comics {
  background: var(--color-bg-soft);
}
.comics-scroll-wrap {
  position: relative;
}
.comics-scroll {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  padding: 1rem 0.5rem 2rem;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) transparent;
}
.comics-scroll::-webkit-scrollbar { height: 6px; }
.comics-scroll::-webkit-scrollbar-track { background: var(--color-border-light); border-radius: 3px; }
.comics-scroll::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 3px; }

.comic-card {
  flex-shrink: 0;
  width: 260px;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  cursor: pointer;
}
.comic-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.comic-cover {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.comic-cover img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.comic-card:hover .comic-cover img { transform: scale(1.08); }
.comic-cover .badge {
  position: absolute;
  top: 0.75rem; left: 0.75rem;
  padding: 0.3rem 0.75rem;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}
.comic-body { padding: 1rem 1.25rem 1.25rem; }
.comic-body h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.comic-body .meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.comics-nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}
.comics-nav button {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-primary);
}
.comics-nav button:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ---------- 用户评价 ---------- */
.reviews {
  background: var(--color-bg);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}
.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.review-stars {
  color: #ffb347;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}
.review-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
  font-style: italic;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.review-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}
.review-author-info .name {
  font-weight: 600;
  font-size: 0.9rem;
}
.review-author-info .role {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---------- 下载CTA ---------- */
.download-cta {
  background: var(--gradient-primary);
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.download-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/comic-4.png") center/cover;
  opacity: 0.1;
}
.download-cta-inner {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}
.download-cta h2 {
  font-size: 2.2rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 1rem;
}
.download-cta p {
  color: rgba(255,255,255,0.9);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}
.download-cta .btn {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.download-cta .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  color: var(--color-primary);
}
.download-cta-meta {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.8);
}

/* ---------- 页脚 ---------- */
.footer {
  background: #2d2a32;
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-brand .logo { color: #fff; margin-bottom: 1rem; }
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  max-width: 280px;
}
.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
  border: none;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-content { margin: 0 auto; }
  .hero-actions, .hero-mini-features { justify-content: center; }
  .hero-visual { margin-top: 2rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .advantages-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .experience-wrap { grid-template-columns: 1fr; gap: 3rem; }
  .experience-phone { order: -1; }
  .reviews-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .section { padding: 3.5rem 0; }
  .section-title { font-size: 1.8rem; }
  .hero-title { font-size: 2.2rem; }
  .hero-phone { width: 220px; }
  .hero-float-card { display: none; }

  .nav-links {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    transition: transform var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }

  .exp-tag { display: none; }
  .comic-card { width: 220px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .back-to-top { bottom: 1rem; right: 1rem; width: 42px; height: 42px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-number { font-size: 1.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}