/* ============================================================
   dhorde.com/ai-tools - 共享样式表 v1.0
   每个专题页通过 :root 覆盖 --brand / --brand-dark / --brand-soft
   实现品牌色主题化。
   ============================================================ */

/* ---------- CSS Variables（默认值，页面内联覆盖） ---------- */
:root {
  --brand: #A371F7;          /* 品牌强调色（每页不同） */
  --brand-dark: #1A1A2E;     /* 深色背景 */
  --brand-soft: rgba(163,113,247,0.10);
  --brand-gray: #6B7280;
  --bg-light: #F7F8FA;
  --bg-white: #FFFFFF;
  --border: #E5E7EB;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6B7280;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 6px 18px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.14);
  --radius: 10px;
  --radius-lg: 16px;
  --radius-sm: 8px;
  --container: 1180px;
  --header-h: 68px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-primary);
  background: var(--bg-light);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; font-family: inherit; background: none; }

/* ---------- Container ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Typography ---------- */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  text-align: center;
  letter-spacing: -0.01em;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 48px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.section-badge {
  display: inline-block;
  padding: 5px 16px;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 30px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}
.section-head { margin-bottom: 48px; }

/* ============================================================
   HEADER（含站内主导航 + AI 工具集产品横向 tab）
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.2s;
}
.site-header.scrolled { box-shadow: 0 1px 14px rgba(0,0,0,0.07); }
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  white-space: nowrap;
}
.brand .brand-mark {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.brand .brand-logo {
  height: 26px;
  width: auto;
  max-width: 120px;
  flex-shrink: 0;
  object-fit: contain;
}
.brand .brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  border-left: 1px solid var(--border);
  padding-left: 10px;
  margin-left: 2px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.main-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.2s;
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--brand-soft);
  color: var(--brand);
}
.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}
.header-phone { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }

/* 产品横向 tab 切换条 */
.product-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.product-tabs::-webkit-scrollbar { display: none; }
.product-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  border: 1px solid transparent;
  transition: all 0.2s;
}
.product-tab .tab-emoji { font-size: 1rem; }
.product-tab:hover { background: var(--brand-soft); color: var(--brand); }
.product-tab.active {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 4px 12px var(--brand-soft);
}
.product-tabs-wrap {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
}
.product-tabs-wrap .container {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.product-tabs-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* 移动端汉堡 */
.mobile-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background: var(--bg-light);
}
.mobile-toggle span {
  width: 20px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: 0.25s;
}
.mobile-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: #fff;
  z-index: 99;
  padding: 20px 24px;
  overflow-y: auto;
}
.mobile-menu.open { display: block; }
.mobile-menu .m-link {
  display: block;
  padding: 14px 8px;
  font-size: 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}
.mobile-menu .m-section {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 700;
  margin: 18px 8px 6px;
}
.mobile-menu .m-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 8px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}
.mobile-menu .m-tab.active { color: var(--brand); font-weight: 700; }
.mobile-menu .m-phone {
  margin-top: 20px;
  text-align: center;
  font-weight: 700;
  color: var(--brand);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 700;
  transition: all 0.2s;
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { filter: brightness(1.06); transform: translateY(-1px); box-shadow: 0 6px 16px var(--brand-soft); }
.btn-outline { background: transparent; color: var(--brand); border-color: var(--brand); }
.btn-outline:hover { background: var(--brand-soft); }
.btn-lg { padding: 14px 34px; font-size: 1rem; }
.btn-sm { padding: 8px 18px; font-size: 0.84rem; }
.btn-block { width: 100%; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  background: linear-gradient(135deg, var(--brand-dark) 0%, #2A2440 55%, var(--brand-dark) 100%);
  color: #fff;
  padding: 76px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 460px; height: 460px;
  background: radial-gradient(circle, var(--brand-soft) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px; left: 8%;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 56px;
  align-items: center;
  position: relative;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--brand-soft);
  border: 1px solid var(--brand);
  border-radius: 30px;
  font-size: 0.82rem;
  color: #fff;
  margin-bottom: 22px;
  width: fit-content;
}
.hero-logo {
  font-size: 3.6rem;
  margin-bottom: 8px;
  line-height: 1;
}
.hero h1 {
  font-size: 2.7rem;
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}
.hero h1 em { color: var(--brand); font-style: normal; }
.hero-lead {
  font-size: 1.12rem;
  font-weight: 600;
  color: rgba(255,255,255,0.92);
  margin-bottom: 14px;
}
.hero-desc {
  font-size: 1.02rem;
  color: rgba(255,255,255,0.72);
  margin-bottom: 30px;
  max-width: 540px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 30px;
  margin-top: 38px;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.12);
  flex-wrap: wrap;
}
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}
.hero-stat-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}
.hero-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
}
.hero-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--brand), #FFB020);
  color: #fff;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.hero-card h3 { font-size: 1.02rem; color: #fff; margin-bottom: 8px; }
.hero-card p { font-size: 0.84rem; color: rgba(255,255,255,0.6); line-height: 1.55; margin-bottom: 16px; }
.hero-card-features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.hero-card-feature {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.78);
}
.hero-card-feature .icon { color: #4ADE80; font-weight: 700; }

/* ============================================================
   SECTION padding & variants
   ============================================================ */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-white); }
.section.dark { background: var(--brand-dark); color: #fff; }
.section.dark .section-title { color: #fff; }
.section.dark .section-subtitle { color: rgba(255,255,255,0.62); }

/* ---------- Overview / Tool grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 26px;
}
.tool-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
}
.tool-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-5px); border-color: transparent; }
.tool-logo {
  width: 64px; height: 64px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  margin-bottom: 18px;
}
.tool-name { font-size: 1.3rem; font-weight: 800; margin-bottom: 6px; }
.tool-vendor { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 14px; }
.tool-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 22px; flex: 1; }
.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--brand);
}
.tool-link:hover { gap: 10px; }

/* ---------- Overview intro ---------- */
.overview-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.overview-text h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 16px; }
.overview-text p { font-size: 1rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.overview-visual {
  background: linear-gradient(135deg, var(--brand-dark), #2A2440);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: #fff;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  position: relative;
  overflow: hidden;
}
.overview-visual::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, var(--brand-soft) 0%, transparent 60%);
}

/* ============================================================
   FEATURES
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  transition: all 0.25s;
}
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: transparent; }
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  background: var(--brand-soft);
}
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.65; }

/* ============================================================
   SCENARIOS
   ============================================================ */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.scenario-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.25s;
}
.scenario-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.scenario-icon { font-size: 2rem; margin-bottom: 14px; }
.scenario-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.scenario-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ============================================================
   PRICING（免费版 vs 付费版 对比）
   ============================================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 24px;
  align-items: start;
}
.pricing-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  transition: all 0.25s;
}
.pricing-card:hover { box-shadow: var(--shadow-lg); }
.pricing-card.featured { border: 2px solid var(--brand); transform: scale(1.02); }
.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: 0; left: 0; right: 0;
  background: var(--brand);
  color: #fff;
  text-align: center;
  padding: 6px;
  font-size: 0.78rem;
  font-weight: 700;
}
.pricing-header { padding: 30px 28px 22px; border-bottom: 1px solid var(--border); }
.pricing-name { font-size: 1.15rem; font-weight: 800; margin-bottom: 4px; }
.pricing-desc { font-size: 0.84rem; color: var(--text-muted); margin-bottom: 18px; }
.pricing-price { display: flex; align-items: baseline; gap: 6px; }
.pricing-price .from { font-size: 0.8rem; color: var(--text-muted); }
.pricing-price .amount { font-size: 2.1rem; font-weight: 800; color: var(--brand); }
.pricing-price .unit { font-size: 0.85rem; color: var(--text-muted); }
.pricing-note { font-size: 0.76rem; color: var(--text-muted); margin-top: 8px; }
.pricing-body { padding: 24px 28px; }
.pricing-body h4 {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.pricing-features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.pricing-feature {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.87rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.pricing-feature .icon { color: #16A34A; font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.pricing-footer { padding: 0 28px 28px; }
.pricing-footer .btn { width: 100%; }

/* ============================================================
   WHY BUY（为什么通过庚乾购买）
   ============================================================ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
}
.why-card {
  text-align: center;
  padding: 34px 22px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all 0.25s;
}
.why-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.why-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--brand);
  line-height: 1;
  margin-bottom: 12px;
}
.why-card h3 { font-size: 1.02rem; font-weight: 700; margin-bottom: 8px; }
.why-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.65; }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  gap: 16px;
}
.faq-question:hover { color: var(--brand); }
.faq-question .arrow { transition: transform 0.2s; color: var(--brand); flex-shrink: 0; }
.faq-item.open .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-answer-inner { padding: 0 24px 18px; font-size: 0.9rem; color: var(--text-secondary); line-height: 1.75; }
.faq-item.open .faq-answer { max-height: 400px; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-form-card, .contact-info-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-form-card h3, .contact-info-card h3 { font-size: 1.1rem; font-weight: 800; margin-bottom: 22px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: var(--bg-light);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-tip { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

.contact-info-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.contact-info-item:last-child { border-bottom: none; }
.contact-info-item .icon { font-size: 1.5rem; flex-shrink: 0; width: 40px; text-align: center; }
.contact-info-item h4 { font-size: 0.86rem; font-weight: 700; margin-bottom: 4px; }
.contact-info-item p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.5; }

.chat-success { text-align: center; padding: 32px 20px; color: var(--text-secondary); font-size: 0.92rem; }
.chat-success .icon { font-size: 3rem; margin-bottom: 12px; }

/* ============================================================
   FOOTER（简版）
   ============================================================ */
.site-footer {
  background: var(--brand-dark);
  color: rgba(255,255,255,0.62);
  padding: 52px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .logo .brand-mark {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), #fff);
  color: var(--brand-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 800;
}
.footer-brand .logo span { color: #fff; font-weight: 700; font-size: 1rem; }
.footer-brand p { font-size: 0.84rem; line-height: 1.7; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.84rem; transition: color 0.2s; }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: rgba(255,255,255,0.5); transition: color 0.2s; }
.footer-bottom a:hover { color: #fff; }

/* ============================================================
   FLOATING CTA
   ============================================================ */
.float-cta {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 52px; height: 52px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.2s;
  border: none; cursor: pointer;
}
.float-btn:hover { transform: scale(1.1); }
.float-btn.primary { background: var(--brand); color: #fff; }
.float-btn.wechat { background: #07C160; color: #fff; }
.float-btn.top { background: #fff; color: var(--text-secondary); border: 1px solid var(--border); display: none; }
.float-btn.top.visible { display: flex; }

/* ============================================================
   UTILITIES
   ============================================================ */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-muted { color: var(--text-muted); }
.brand-color { color: var(--brand); }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-card { display: none; }
  .overview-grid { grid-template-columns: 1fr; }
  .overview-visual { min-height: 200px; font-size: 4rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .pricing-card.featured { transform: none; }
}
@media (max-width: 768px) {
  .main-nav, .header-cta .header-phone { display: none; }
  .mobile-toggle { display: flex; }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.6rem; }
  .hero { padding: 56px 0 72px; }
  .hero h1 { font-size: 1.9rem; }
  .hero-logo { font-size: 2.8rem; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .product-tabs-wrap .container { overflow-x: auto; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions .btn { width: 100%; }
}

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }