/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #f6331e;
  --primary-dark: #d42a18;
  --primary-light: #fff0ee;
  --text: #1a1a2e;
  --text-secondary: #666;
  --text-light: #999;
  --bg: #ffffff;
  --bg-alt: #f8f9fc;
  --border: #eee;
  --shadow: 0 4px 24px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.1);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: .3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-compact { padding: 48px 0; }
.section-alt { background: var(--bg-alt); }

.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: .05em;
}
.section-header h2 { font-size: 2.25rem; font-weight: 700; margin-bottom: 12px; letter-spacing: -.02em; }
.section-header p { font-size: 1.125rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* Reveal animation - visible by default, animate when JS ready */
.reveal { opacity: 1; transform: none; }
html.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
html.js .reveal.visible { opacity: 1; transform: none; }
html.js .reveal-delay { transition-delay: .15s; }
html.js .reveal-delay-2 { transition-delay: .3s; }
html.js .reveal-delay-3 { transition-delay: .45s; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 32px; border-radius: 50px; font-size: 1rem; font-weight: 600;
  border: 2px solid transparent; cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(246,51,30,.3); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-white { background: #fff; color: var(--primary); border-color: #fff; }
.btn-white:hover { background: var(--primary-light); color: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost { background: rgba(255,255,255,.15); color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.25); color: #fff; }
.btn-sm { padding: 10px 24px; font-size: .9rem; }
.btn-block { width: 100%; }

/* ===== Header ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: all var(--transition);
}
.header.scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow); }
.header-inner { display: flex; align-items: center; height: 72px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: 1.25rem; font-weight: 700; flex-shrink: 0; }
.logo img { width: 36px; height: 36px; object-fit: contain; }
.logo:hover { color: var(--text); }
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: var(--text-secondary); font-size: .9rem; font-weight: 500; position: relative; }
.nav a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--primary); transition: width var(--transition); }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a.active::after, .nav a:hover::after { width: 100%; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; margin-left: auto; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text); transition: all var(--transition); }
.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Hero ===== */
.hero {
  position: relative; padding: 140px 0 100px;
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 60%, #fff5f3 100%);
  overflow: hidden;
}
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; }
.shape { position: absolute; border-radius: 50%; opacity: .08; }
.shape-1 { width: 400px; height: 400px; background: var(--primary); top: -100px; right: -100px; animation: float 8s ease-in-out infinite; }
.shape-2 { width: 250px; height: 250px; background: #ff6b4a; bottom: 50px; left: -50px; animation: float 6s ease-in-out infinite reverse; }
.shape-3 { width: 150px; height: 150px; background: var(--primary); top: 50%; left: 40%; animation: float 10s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }

.hero-inner {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -webkit-box-align: center; -ms-flex-align: center; align-items: center;
  gap: 48px; position: relative; z-index: 1;
}
.hero-content { -webkit-box-flex: 1; -ms-flex: 1 1 50%; flex: 1 1 50%; min-width: 0; }
.hero-visual { -webkit-box-flex: 1; -ms-flex: 1 1 50%; flex: 1 1 50%; min-width: 0; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; background: var(--primary-light); color: var(--primary); padding: 6px 16px; border-radius: 50px; font-size: .875rem; font-weight: 600; margin-bottom: 20px; }
.tag-dot { width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }
.hero h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; letter-spacing: -.03em; margin-bottom: 20px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero-desc { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; margin-bottom: 48px; }
.hero-stats {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -webkit-box-orient: horizontal; -webkit-box-direction: normal;
  -ms-flex-direction: row; flex-direction: row;
  gap: 40px; flex-wrap: wrap;
}
.stat { min-width: 100px; }
.stat-value { line-height: 1.2; margin-bottom: 4px; }
.stat strong { display: inline; font-size: 1.75rem; font-weight: 800; color: #f6331e; }
.stat-suffix { font-size: 1.25rem; font-weight: 800; color: #f6331e; }
.stat-label { display: block; font-size: .85rem; color: #999; }

.phone-mockup { position: relative; display: flex; justify-content: center; }
.hero-img { max-width: 380px; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); animation: heroFloat 4s ease-in-out infinite; }
@keyframes heroFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

.float-card {
  position: absolute; background: #fff; border-radius: var(--radius);
  padding: 12px 16px; box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: 10px;
  font-size: .8rem; animation: cardFloat 3s ease-in-out infinite;
}
.float-card img { width: 32px; height: 32px; }
.float-card strong { display: block; color: var(--text); font-size: .85rem; }
.float-card span { color: var(--text-light); font-size: .75rem; }
.float-card-1 { top: 20%; right: -20px; animation-delay: 0s; }
.float-card-2 { bottom: 25%; left: -30px; animation-delay: 1.5s; }
@keyframes cardFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

.hero-scroll-hint { text-align: center; margin-top: 40px; color: var(--text-light); font-size: .8rem; }
.scroll-arrow { width: 20px; height: 20px; border-right: 2px solid var(--text-light); border-bottom: 2px solid var(--text-light); transform: rotate(45deg); margin: 8px auto 0; animation: scrollBounce 2s infinite; }
@keyframes scrollBounce { 0%, 100% { transform: rotate(45deg) translateY(0); } 50% { transform: rotate(45deg) translateY(6px); } }

/* ===== Metrics ===== */
.metrics { background: #1a1a2e; color: #fff; padding: 48px 0; }
.metrics-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -webkit-box-orient: horizontal; -webkit-box-direction: normal;
  -ms-flex-direction: row; flex-direction: row;
  -ms-flex-wrap: wrap; flex-wrap: wrap;
  gap: 24px; text-align: center;
}
.metric-item {
  -webkit-box-flex: 1; -ms-flex: 1 1 calc(25% - 24px); flex: 1 1 calc(25% - 24px);
  min-width: 140px; padding: 8px 12px;
}
.metric-num { font-size: 2.5rem; font-weight: 800; color: #f6331e; line-height: 1.2; }
.metric-num em { font-size: 1rem; font-style: normal; color: rgba(255,255,255,.7); margin-left: 2px; }
.metric-label { font-size: .9rem; color: rgba(255,255,255,.65); margin-top: 8px; }

/* ===== Intro ===== */
.intro-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 32px;
}
.intro-card { -webkit-box-flex: 1; -ms-flex: 1 1 calc(33.333% - 24px); flex: 1 1 calc(33.333% - 24px); min-width: 280px; }
.intro-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px 32px; text-align: center; transition: all var(--transition);
}
.intro-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.intro-icon { width: 72px; height: 72px; margin: 0 auto 20px; background: var(--primary-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.intro-icon img { width: 40px; height: 40px; object-fit: contain; }
.intro-icon svg { width: 32px; height: 32px; color: var(--primary); }
.intro-card h3 { font-size: 1.25rem; margin-bottom: 12px; }
.intro-card > p { color: var(--text-secondary); font-size: .95rem; margin-bottom: 16px; }
.intro-tags { list-style: none; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.intro-tags li { background: var(--primary-light); color: var(--primary); padding: 4px 12px; border-radius: 50px; font-size: .75rem; font-weight: 600; }

/* ===== Feature Tabs ===== */
.feature-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 40px; flex-wrap: wrap; }
.tab-btn {
  padding: 10px 24px; border-radius: 50px; border: 2px solid var(--border);
  background: var(--bg); color: var(--text-secondary); font-size: .9rem; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; animation: fadeIn .4s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.features-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 24px;
}
.feature-card { -webkit-box-flex: 1; -ms-flex: 1 1 calc(25% - 20px); flex: 1 1 calc(25% - 20px); min-width: 220px; }
.feature-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 22px; transition: all var(--transition); cursor: default; position: relative; overflow: hidden;
}
.feature-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-4px); }
.feature-card:hover .feature-detail { max-height: 80px; opacity: 1; margin-top: 10px; }
.feature-icon { width: 48px; height: 48px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 14px; font-size: 1.5rem; }
.feature-icon img { width: 28px; height: 28px; object-fit: contain; }
.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card > p { font-size: .85rem; color: var(--text-secondary); line-height: 1.7; }
.feature-detail { font-size: .8rem; color: var(--primary); max-height: 0; opacity: 0; overflow: hidden; transition: all .4s ease; line-height: 1.6; }

/* ===== Advantages ===== */
.advantages-layout {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  gap: 48px; -webkit-box-align: start; -ms-flex-align: start; align-items: flex-start;
}
.advantages-list { -webkit-box-flex: 1; -ms-flex: 1 1 50%; flex: 1 1 50%; min-width: 0; }
.advantages-visual { -webkit-box-flex: 1; -ms-flex: 1 1 50%; flex: 1 1 50%; min-width: 0; position: sticky; top: 100px; }
.advantage-item {
  display: flex; gap: 16px; padding: 20px; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition); border: 2px solid transparent; margin-bottom: 8px;
}
.advantage-item:hover { background: var(--bg-alt); }
.advantage-item.active { background: var(--primary-light); border-color: var(--primary); }
.advantage-num { font-size: 1.5rem; font-weight: 800; color: var(--primary); opacity: .3; flex-shrink: 0; line-height: 1; }
.advantage-item.active .advantage-num { opacity: 1; }
.advantage-item h3 { font-size: 1.05rem; margin-bottom: 6px; }
.advantage-item p { font-size: .875rem; color: var(--text-secondary); }

.advantage-preview {
  display: none; background: var(--bg); border-radius: var(--radius-lg); padding: 36px;
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.advantage-preview.active { display: block; animation: fadeIn .4s ease; }
.preview-icon { width: 48px; height: 48px; margin-bottom: 16px; }
.advantage-preview h4 { font-size: 1.25rem; margin-bottom: 12px; }
.advantage-preview > p { color: var(--text-secondary); font-size: .95rem; margin-bottom: 20px; }

.preview-bars { display: flex; flex-direction: column; gap: 12px; }
.preview-bar { display: flex; align-items: center; gap: 12px; font-size: .8rem; }
.preview-bar span { width: 50px; color: var(--text-secondary); }
.bar { flex: 1; height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--primary); border-radius: 4px; transition: width 1s ease; }
.bar-fill.warn { background: #ff9800; }

.wechat-steps { display: flex; gap: 12px; flex-wrap: wrap; }
.wechat-steps span { background: var(--primary-light); color: var(--primary); padding: 8px 16px; border-radius: 50px; font-size: .85rem; font-weight: 600; }
.loop-diagram { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: .85rem; }
.loop-diagram span { background: var(--bg-alt); padding: 6px 12px; border-radius: 8px; }
.sms-demo { background: var(--bg-alt); padding: 14px 18px; border-radius: var(--radius); font-size: .85rem; color: var(--text-secondary); border-left: 3px solid var(--primary); }
.config-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.config-tags span { background: var(--primary-light); color: var(--primary); padding: 6px 14px; border-radius: 50px; font-size: .8rem; font-weight: 600; }

/* ===== Detail ===== */
.detail-row {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  gap: 64px; -webkit-box-align: center; -ms-flex-align: center; align-items: center;
}
.detail-content, .detail-visual { -webkit-box-flex: 1; -ms-flex: 1 1 50%; flex: 1 1 50%; min-width: 0; }
.detail-row.reverse { -webkit-box-orient: horizontal; -webkit-box-direction: reverse; -ms-flex-direction: row-reverse; flex-direction: row-reverse; }
.detail-label { display: inline-block; background: var(--primary); color: #fff; padding: 4px 14px; border-radius: 50px; font-size: .8rem; font-weight: 600; margin-bottom: 16px; }
.detail-content h2 { font-size: 2rem; margin-bottom: 16px; letter-spacing: -.02em; }
.detail-content > p { color: var(--text-secondary); margin-bottom: 24px; font-size: 1.05rem; }
.detail-list { list-style: none; }
.detail-list li { padding: 10px 0; padding-left: 28px; position: relative; color: var(--text-secondary); font-size: .95rem; border-bottom: 1px solid var(--border); }
.detail-list li:last-child { border-bottom: none; }
.detail-list li::before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.detail-banner { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); width: 100%; }

/* ===== Scenes ===== */
.scenes-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 24px;
}
.scene-card {
  -webkit-box-flex: 1; -ms-flex: 1 1 calc(25% - 20px); flex: 1 1 calc(25% - 20px); min-width: 220px;
  background: var(--bg); border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
  box-shadow: var(--shadow); transition: all var(--transition); border: 2px solid transparent;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.scene-card.expanded { border-color: var(--primary); text-align: left; }
.scene-emoji { font-size: 2.5rem; margin-bottom: 12px; }
.scene-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.scene-brief { font-size: .875rem; color: var(--text-secondary); }
.scene-expand { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.scene-card.expanded .scene-expand { max-height: 300px; margin-top: 16px; }
.scene-expand p { font-size: .85rem; color: var(--text-secondary); margin-bottom: 12px; }
.scene-expand ul { list-style: none; display: flex; gap: 8px; flex-wrap: wrap; }
.scene-expand li { background: var(--primary-light); color: var(--primary); padding: 4px 12px; border-radius: 50px; font-size: .75rem; font-weight: 600; }
.scene-toggle {
  margin-top: 16px; background: none; border: none; color: var(--primary);
  font-size: .85rem; font-weight: 600; cursor: pointer; transition: color var(--transition);
}
.scene-toggle:hover { color: var(--primary-dark); }
.scene-card.expanded .scene-toggle::after { content: ' ↑'; }

/* ===== Timeline Steps ===== */
.timeline { position: relative; }
.timeline-track { height: 4px; background: var(--border); border-radius: 2px; margin-bottom: 40px; position: relative; }
.timeline-progress { height: 100%; background: var(--primary); border-radius: 2px; width: 25%; transition: width .5s ease; }
.steps-interactive {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 24px;
}
.step-item { -webkit-box-flex: 1; -ms-flex: 1 1 calc(25% - 20px); flex: 1 1 calc(25% - 20px); min-width: 200px; }
.step-item { text-align: center; cursor: pointer; padding: 16px; border-radius: var(--radius); transition: all var(--transition); }
.step-item:hover { background: var(--bg-alt); }
.step-item.active { background: var(--primary-light); }
.step-circle {
  width: 56px; height: 56px; border-radius: 50%; background: var(--border); color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1.1rem;
  margin: 0 auto 12px; transition: all var(--transition);
}
.step-item.active .step-circle { background: var(--primary); color: #fff; box-shadow: 0 4px 16px rgba(246,51,30,.3); }
.step-item h3 { font-size: 1rem; margin-bottom: 8px; }
.step-detail { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.step-item.active .step-detail { max-height: 120px; }
.step-detail p { font-size: .85rem; color: var(--text-secondary); padding-top: 8px; }

/* ===== Pricing ===== */
.pricing-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 24px;
  -webkit-box-align: start; -ms-flex-align: start; align-items: flex-start;
  -webkit-box-pack: center; -ms-flex-pack: center; justify-content: center;
}
.pricing-card { -webkit-box-flex: 1; -ms-flex: 1 1 calc(33.333% - 20px); flex: 1 1 calc(33.333% - 20px); min-width: 260px; max-width: 360px; }
.pricing-card {
  background: var(--bg); border: 2px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px 32px; text-align: center; position: relative; transition: all var(--transition);
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pricing-card.featured { border-color: var(--primary); box-shadow: 0 8px 32px rgba(246,51,30,.15); }
.pricing-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; padding: 4px 16px; border-radius: 50px; font-size: .75rem; font-weight: 700; }
.pricing-card h3 { font-size: 1.25rem; margin-bottom: 8px; }
.pricing-price { font-size: 2.5rem; font-weight: 800; color: var(--primary); }
.pricing-period { font-size: .9rem; color: var(--text-light); margin-bottom: 24px; }
.pricing-features { list-style: none; text-align: left; margin-bottom: 28px; }
.pricing-features li { padding: 8px 0; font-size: .9rem; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.pricing-features li:last-child { border-bottom: none; }

/* ===== Testimonials ===== */
.testimonial-slider { overflow: hidden; position: relative; }
.testimonial-track { display: flex; transition: transform .5s ease; }
.testimonial-card {
  min-width: 100%; padding: 40px; background: var(--bg); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); border: 1px solid var(--border);
}
.testimonial-stars { color: #ffb400; font-size: 1.25rem; margin-bottom: 16px; letter-spacing: 2px; }
.testimonial-text { font-size: 1.1rem; color: var(--text); line-height: 1.8; margin-bottom: 24px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 14px; }
.author-avatar { width: 48px; height: 48px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; }
.testimonial-author strong { display: block; font-size: .95rem; }
.testimonial-author span { font-size: .8rem; color: var(--text-light); }
.slider-controls { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 24px; }
.slider-btn { width: 40px; height: 40px; border-radius: 50%; border: 2px solid var(--border); background: var(--bg); font-size: 1.25rem; cursor: pointer; transition: all var(--transition); color: var(--text); }
.slider-btn:hover { border-color: var(--primary); color: var(--primary); }
.slider-dots { display: flex; gap: 8px; }
.slider-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); cursor: pointer; transition: all var(--transition); }
.slider-dot.active { background: var(--primary); width: 24px; border-radius: 4px; }

/* ===== FAQ ===== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 20px 0; background: none; border: none; cursor: pointer;
  font-size: 1rem; font-weight: 600; color: var(--text); text-align: left; transition: color var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-icon { width: 20px; height: 20px; flex-shrink: 0; transition: transform var(--transition); color: var(--text-light); }
.faq-item.open .faq-icon { transform: rotate(180deg); color: var(--primary); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.faq-item.open .faq-answer { max-height: 200px; }
.faq-answer p { padding-bottom: 20px; font-size: .95rem; color: var(--text-secondary); line-height: 1.8; }

/* ===== CTA ===== */
.cta { background: linear-gradient(135deg, var(--primary) 0%, #ff6b4a 100%); padding: 80px 0; text-align: center; color: #fff; }
.cta h2 { font-size: 2rem; margin-bottom: 12px; }
.cta p { font-size: 1.1rem; opacity: .9; margin-bottom: 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-hint { margin-top: 12px; font-size: .85rem; opacity: .8; min-height: 20px; }

/* ===== Contact ===== */
.contact-grid {
  display: -webkit-box; display: -ms-flexbox; display: flex;
  -ms-flex-wrap: wrap; flex-wrap: wrap; gap: 24px;
}
.contact-card { -webkit-box-flex: 1; -ms-flex: 1 1 calc(25% - 20px); flex: 1 1 calc(25% - 20px); min-width: 200px; }
.contact-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 24px; text-align: center; transition: all var(--transition); cursor: pointer; position: relative;
}
.contact-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.contact-card.copied { border-color: #4caf50; }
.contact-icon { width: 56px; height: 56px; margin: 0 auto 16px; background: var(--primary-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.contact-icon svg { width: 24px; height: 24px; color: var(--primary); }
.contact-card h3 { font-size: 1rem; margin-bottom: 6px; }
.contact-card p { font-size: .9rem; color: var(--text-secondary); }
.copy-hint { display: block; font-size: .75rem; color: var(--text-light); margin-top: 8px; opacity: 0; transition: opacity var(--transition); }
.contact-card:hover .copy-hint { opacity: 1; }

/* ===== Footer ===== */
.footer { background: var(--text); color: rgba(255,255,255,.7); padding: 40px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 8px; color: #fff; font-weight: 700; }
.footer-brand img { width: 28px; height: 28px; }
.footer-copy { font-size: .85rem; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: rgba(255,255,255,.6); font-size: .85rem; }
.footer-links a:hover { color: #fff; }

/* ===== Back to top ===== */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px;
  background: var(--primary); color: #fff; border: none; border-radius: 50%;
  cursor: pointer; box-shadow: 0 4px 16px rgba(246,51,30,.3);
  opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all var(--transition); z-index: 999; display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-4px); }
.back-to-top svg { width: 20px; height: 20px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .feature-card { -ms-flex: 1 1 calc(50% - 16px); flex: 1 1 calc(50% - 16px); }
  .scene-card { -ms-flex: 1 1 calc(50% - 16px); flex: 1 1 calc(50% - 16px); }
  .advantages-layout { -webkit-box-orient: vertical; -webkit-box-direction: normal; -ms-flex-direction: column; flex-direction: column; }
  .advantages-visual { position: static; }
  .pricing-card { -ms-flex: 1 1 100%; flex: 1 1 100%; max-width: 400px; }
  .contact-card { -ms-flex: 1 1 calc(50% - 16px); flex: 1 1 calc(50% - 16px); }
  .metric-item { -ms-flex: 1 1 calc(50% - 16px); flex: 1 1 calc(50% - 16px); }
  .metrics-grid { gap: 16px; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .section-header h2 { font-size: 1.75rem; }
  .nav { display: none; }
  .header-inner .btn-sm { display: none; }
  .menu-toggle { display: flex; }
  .nav.open {
    display: flex; flex-direction: column; position: fixed;
    top: 72px; left: 0; right: 0; background: #fff; padding: 24px;
    gap: 16px; box-shadow: var(--shadow-lg); border-top: 1px solid var(--border);
  }
  .hero { padding: 120px 0 60px; }
  .hero-inner { -webkit-box-orient: vertical; -webkit-box-direction: normal; -ms-flex-direction: column; flex-direction: column; text-align: center; }
  .hero h1 { font-size: 2.25rem; }
  .hero-desc { margin: 0 auto 32px; }
  .hero-actions { -webkit-box-pack: center; -ms-flex-pack: center; justify-content: center; }
  .hero-stats { -webkit-box-pack: center; -ms-flex-pack: center; justify-content: center; }
  .hero-visual { -webkit-box-ordinal-group: 0; -ms-flex-order: -1; order: -1; width: 100%; }
  .hero-img { max-width: 280px; margin: 0 auto; }
  .float-card { display: none; }
  .intro-card { -ms-flex: 1 1 100%; flex: 1 1 100%; }
  .detail-row, .detail-row.reverse { -webkit-box-orient: vertical; -webkit-box-direction: normal; -ms-flex-direction: column; flex-direction: column; gap: 32px; }
  .feature-card, .scene-card, .step-item, .contact-card { -ms-flex: 1 1 100%; flex: 1 1 100%; }
  .metric-item { -ms-flex: 1 1 calc(50% - 12px); flex: 1 1 calc(50% - 12px); }
  .footer-inner { -webkit-box-orient: vertical; -webkit-box-direction: normal; -ms-flex-direction: column; flex-direction: column; text-align: center; }
}