/* ============================================
   湖南瑞灵网络科技 - 设计系统
   独特配色 · 卡片布局 · Mobile First
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Space+Grotesk:wght@400;500;700&display=swap');

:root {
  /* 核心色彩 */
  --primary: #1A0B3E;
  --primary-mid: #4A2D8A;
  --primary-light: #7C5DC7;
  --accent: #F7A832;
  --accent-hover: #E5961E;
  --teal: #22D1B0;
  --teal-light: #E0FBF5;
  --coral: #FF6B6B;
  --bg: #FAF8FF;
  --bg-alt: #F0EDF7;
  --card: #FFFFFF;
  --text: #1A1A2E;
  --text-mid: #5A5678;
  --text-light: #8E8AA0;
  --border: #E8E4F0;
  /* 渐变 */
  --gradient-hero: linear-gradient(135deg, #1A0B3E 0%, #3D1E7C 40%, #6C3CE0 100%);
  --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F8F6FF 100%);
  --gradient-accent: linear-gradient(135deg, #F7A832 0%, #FF6B6B 100%);
  --gradient-teal: linear-gradient(135deg, #22D1B0 0%, #4A9DE0 100%);
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(26,11,62,0.06);
  --shadow-md: 0 4px 20px rgba(26,11,62,0.08);
  --shadow-lg: 0 8px 40px rgba(26,11,62,0.12);
  --shadow-card: 0 4px 24px rgba(26,11,62,0.07);
  --shadow-hover: 0 12px 48px rgba(26,11,62,0.15);
  /* 过渡 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.3s var(--ease);
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 自定义滚动条 */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary-mid); border-radius: 3px; }

a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* ========== 导航 ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(26,11,62,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.75rem 0;
  transition: var(--transition);
}
.nav.scrolled { background: rgba(26,11,62,0.98); box-shadow: var(--shadow-md); }
.nav .container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 1.25rem; color: #FFF;
}
.nav-logo svg { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 1.8rem; align-items: center; }
.nav-links a {
  color: rgba(255,255,255,0.8); font-size: 0.9rem; font-weight: 500;
  position: relative; padding: 0.3rem 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--accent); transition: var(--transition);
}
.nav-links a:hover { color: #FFF; }
.nav-links a:hover::after { width: 100%; }

/* 汉堡菜单 */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 4px;
}
.hamburger span {
  width: 24px; height: 2px; background: #FFF; border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== Hero ========== */
.hero {
  background: var(--gradient-hero);
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 6rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -50%; right: -20%;
  width: 60vw; height: 60vw;
  background: radial-gradient(circle, rgba(108,60,224,0.3) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute; bottom: -30%; left: -10%;
  width: 40vw; height: 40vw;
  background: radial-gradient(circle, rgba(34,209,176,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50px; padding: 0.4rem 1rem;
  color: var(--teal); font-size: 0.8rem; font-weight: 500;
  margin-bottom: 1.5rem;
}
.hero-badge span { width: 6px; height: 6px; background: var(--teal); border-radius: 50%; animation: pulse 2s infinite; }
.hero h1 {
  font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900; color: #FFF;
  line-height: 1.2; margin-bottom: 1.2rem;
}
.hero h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { color: rgba(255,255,255,0.75); font-size: clamp(0.95rem, 2vw, 1.1rem); margin-bottom: 2rem; max-width: 540px; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }

/* 按钮系统 */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.8rem;
  border-radius: 50px; font-weight: 600; font-size: 0.9rem;
  border: none; cursor: pointer;
  transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-accent); color: #FFF;
  box-shadow: 0 4px 16px rgba(247,168,50,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(247,168,50,0.45); }
.btn-outline {
  background: transparent; color: #FFF;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-outline:hover { border-color: #FFF; background: rgba(255,255,255,0.08); }
.btn-dark {
  background: var(--primary); color: #FFF;
  box-shadow: 0 4px 16px rgba(26,11,62,0.25);
}
.btn-dark:hover { background: var(--primary-mid); transform: translateY(-2px); }
.btn-teal {
  background: var(--gradient-teal); color: #FFF;
  box-shadow: 0 4px 16px rgba(34,209,176,0.3);
}
.btn-teal:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(34,209,176,0.4); }

/* ========== 统计数据 ========== */
.stats {
  padding: 3rem 0;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: center;
}
.stat-item h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item p { font-size: 0.85rem; color: var(--text-light); margin-top: 0.3rem; }

/* ========== 通用段落 ========== */
.section { padding: 4rem 0; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-tag {
  display: inline-block;
  background: var(--teal-light); color: var(--teal);
  padding: 0.3rem 1rem; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 0.8rem;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 800; line-height: 1.3;
}
.section-desc { color: var(--text-mid); margin-top: 0.8rem; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ========== 关于我们 ========== */
.about { background: var(--card); }
.about-grid { display: grid; gap: 2.5rem; align-items: center; }
.about-img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.about-img img { width: 100%; height: 320px; object-fit: cover; }
.about-text h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.8rem; }
.about-text p { color: var(--text-mid); margin-bottom: 1rem; }
.about-features { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.2rem; }
.about-tag {
  background: var(--bg-alt); padding: 0.4rem 0.9rem; border-radius: 50px;
  font-size: 0.8rem; color: var(--primary-mid); font-weight: 500;
}

/* ========== 服务卡片 ========== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.service-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-teal);
  transform: scaleX(0); transform-origin: left;
  transition: var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 52px; height: 52px;
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}
.service-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.service-card p { color: var(--text-mid); font-size: 0.88rem; line-height: 1.6; }

/* ========== 产品卡片 ========== */
.products { background: var(--bg-alt); }
.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.product-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  cursor: pointer;
  display: block;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.product-img {
  position: relative;
  height: 200px;
  overflow: hidden;
}
.product-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.product-card:hover .product-img img { transform: scale(1.06); }
.product-tag {
  position: absolute; top: 1rem; left: 1rem;
  background: var(--accent); color: #FFF;
  padding: 0.25rem 0.75rem; border-radius: 50px;
  font-size: 0.72rem; font-weight: 600;
}
.product-body { padding: 1.2rem 1.4rem 1.4rem; }
.product-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.product-body .desc { color: var(--text-mid); font-size: 0.82rem; margin-bottom: 0.8rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-meta { display: flex; align-items: center; justify-content: space-between; }
.product-price { font-family: 'Space Grotesk', sans-serif; font-size: 1.3rem; font-weight: 700; color: var(--coral); }
.product-price .unit { font-size: 0.75rem; color: var(--text-light); font-weight: 400; }
.product-rating { display: flex; align-items: center; gap: 0.3rem; color: var(--accent); font-size: 0.8rem; }

/* ========== 评价 ========== */
.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.review-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); }
.review-stars { color: var(--accent); font-size: 0.9rem; margin-bottom: 0.8rem; }
.review-text { color: var(--text-mid); font-size: 0.9rem; line-height: 1.7; margin-bottom: 1rem; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 0.8rem; }
.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--gradient-teal);
  display: flex; align-items: center; justify-content: center;
  color: #FFF; font-weight: 700; font-size: 0.85rem;
}
.review-info h4 { font-size: 0.88rem; font-weight: 600; }
.review-info p { font-size: 0.75rem; color: var(--text-light); }

/* ========== 页脚 ========== */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand h3 { color: #FFF; font-size: 1.1rem; margin-bottom: 0.6rem; }
.footer-brand p { font-size: 0.85rem; line-height: 1.6; }
.footer-links h4 { color: #FFF; font-size: 0.9rem; margin-bottom: 0.8rem; }
.footer-links a { display: block; font-size: 0.85rem; padding: 0.25rem 0; }
.footer-links a:hover { color: var(--accent); }
.footer-contact p { font-size: 0.85rem; margin-bottom: 0.4rem; display: flex; align-items: center; gap: 0.5rem; }
.footer-bottom {
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  padding-top: 1.5rem;
  text-align: center; font-size: 0.78rem;
}
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--accent); text-decoration: underline; }

/* ========== 返回顶部 ========== */
.back-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 44px; height: 44px;
  background: var(--primary);
  color: #FFF;
  border: none; border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 900;
  font-size: 1.2rem;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--primary-mid); transform: translateY(-2px); }

/* ========== AI 客服 ========== */
.chat-widget {
  position: fixed;
  bottom: 2rem; left: 2rem;
  z-index: 950;
}
.chat-toggle {
  width: 56px; height: 56px;
  background: var(--gradient-accent);
  border: none; border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(247,168,50,0.4);
  transition: var(--transition);
  font-size: 1.4rem;
  color: #FFF;
  position: relative;
}
.chat-toggle::after {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--gradient-accent);
  animation: chatPulse 2s infinite;
  z-index: -1;
}
.chat-toggle:hover { transform: scale(1.08); }
.chat-box {
  position: absolute;
  bottom: 70px; left: 0;
  width: 320px;
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: scale(0.8) translateY(10px);
  transform-origin: bottom left;
  opacity: 0; visibility: hidden;
  transition: var(--transition);
}
.chat-box.open { transform: scale(1) translateY(0); opacity: 1; visibility: visible; }
.chat-header {
  background: var(--gradient-hero);
  color: #FFF;
  padding: 1rem 1.2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.chat-header h4 { font-size: 0.95rem; }
.chat-close { background: none; border: none; color: rgba(255,255,255,0.7); cursor: pointer; font-size: 1.2rem; }
.chat-close:hover { color: #FFF; }
.chat-messages {
  padding: 1rem;
  height: 260px;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 0.8rem;
}
.chat-msg {
  max-width: 85%;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  line-height: 1.5;
}
.chat-msg.bot {
  background: var(--bg-alt);
  color: var(--text);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.chat-msg.user {
  background: var(--primary);
  color: #FFF;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.chat-input-area {
  display: flex; gap: 0.5rem;
  padding: 0.8rem;
  border-top: 1px solid var(--border);
}
.chat-input {
  flex: 1; border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}
.chat-input:focus { border-color: var(--primary-mid); }
.chat-send {
  width: 36px; height: 36px;
  background: var(--primary);
  color: #FFF;
  border: none; border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
}
.chat-send:hover { background: var(--primary-mid); }

/* ========== 详情页 ========== */
.detail-hero {
  background: var(--gradient-hero);
  padding: 7rem 0 3rem;
}
.detail-hero .breadcrumb { color: rgba(255,255,255,0.6); font-size: 0.85rem; margin-bottom: 1rem; }
.detail-hero .breadcrumb a { color: rgba(255,255,255,0.6); }
.detail-hero .breadcrumb a:hover { color: #FFF; }
.detail-hero h1 { color: #FFF; font-size: clamp(1.5rem, 4vw, 2.2rem); font-weight: 800; }
.detail-hero p { color: rgba(255,255,255,0.7); margin-top: 0.5rem; }

.detail-content { padding: 2.5rem 0; }
.detail-grid { display: grid; gap: 2rem; }
.detail-img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.detail-img img { width: 100%; height: 300px; object-fit: cover; }
.detail-info h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.3rem; }
.detail-price-box {
  background: var(--bg-alt); border-radius: var(--radius-md);
  padding: 1rem 1.2rem; margin: 1rem 0;
  display: flex; align-items: center; justify-content: space-between;
}
.detail-price {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem; font-weight: 700; color: var(--coral);
}
.detail-desc { color: var(--text-mid); font-size: 0.92rem; line-height: 1.8; }
.feature-list { margin: 1.5rem 0; }
.feature-list li {
  padding: 0.5rem 0; font-size: 0.9rem; color: var(--text-mid);
  display: flex; align-items: flex-start; gap: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.feature-list li:last-child { border-bottom: none; }
.feature-check { color: var(--teal); font-weight: 700; flex-shrink: 0; }

/* ========== 下单页 ========== */
.order-section { padding: 2.5rem 0; }
.order-grid { display: grid; gap: 2rem; }
.order-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 0.4rem; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 0.7rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem; font-family: inherit;
  transition: var(--transition);
  background: var(--bg);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--primary-mid);
  box-shadow: 0 0 0 3px rgba(74,45,138,0.08);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.order-summary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: sticky; top: 5rem;
}
.order-summary h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; padding-bottom: 0.8rem; border-bottom: 1px solid var(--border); }
.summary-item {
  display: flex; justify-content: space-between;
  padding: 0.5rem 0; font-size: 0.88rem; color: var(--text-mid);
}
.summary-total {
  display: flex; justify-content: space-between;
  padding: 0.8rem 0; margin-top: 0.5rem;
  border-top: 2px solid var(--border);
  font-weight: 700; font-size: 1.1rem;
}
.summary-total .price { color: var(--coral); font-family: 'Space Grotesk', sans-serif; font-size: 1.4rem; }

/* ========== 动画 ========== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
@keyframes chatPulse {
  0% { transform: scale(1); opacity: 0.4; }
  100% { transform: scale(1.6); opacity: 0; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ========== 响应式 ========== */
@media (min-width: 640px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .hamburger { display: none; }
  .nav-links { display: flex !important; }
  .services-grid { grid-template-columns: repeat(3, 1fr); }
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .reviews-grid { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr 1fr; }
  .detail-grid { grid-template-columns: 1fr 1fr; }
  .order-grid { grid-template-columns: 1.2fr 0.8fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
  .section { padding: 5rem 0; }
}

@media (max-width: 959px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(26,11,62,0.98);
    flex-direction: column;
    padding: 1rem 5%;
    gap: 0;
  }
  .nav-links.active { display: flex; }
  .nav-links a { padding: 0.8rem 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .hamburger { display: flex; }
  .chat-box { width: 280px; }
}

@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; justify-content: center; }
  .product-img { height: 170px; }
  .chat-box { left: -1rem; width: calc(100vw - 2rem); }
}