:root {
  --bg: #ffffff;
  --bg-2: #F4FAFB;
  --bg-3: #E8F7F9;
  --fg: #0F1B2D;
  --fg-2: #4A6072;
  --fg-3: #7A96A8;
  --accent: #00C4D4;
  --accent-dark: #00A3B5;
  --accent-dim: rgba(0, 196, 212, 0.10);
  --hot: #FF6B35;
  --hot-dim: rgba(255, 107, 53, 0.12);
  --card: #ffffff;
  --border: rgba(15, 27, 45, 0.09);
  --shadow: rgba(15, 27, 45, 0.07);
  --nav-h: 60px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Syne', sans-serif; font-weight: 800; line-height: 1.1; }

/* ── NAV ────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 100;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  display: flex; align-items: center; justify-content: space-between;
  min-height: var(--nav-h);
}
.nav-brand {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: 18px;
  letter-spacing: -0.5px; color: var(--fg); text-decoration: none;
}
.nav-badge {
  font-size: 12px; font-weight: 600; color: var(--hot);
  background: var(--hot-dim); padding: 4px 12px; border-radius: 20px;
}

/* ── HERO ────────────────────────────────────────────────── */
.hero {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: calc(100svh - var(--nav-h));
  background: linear-gradient(160deg, #fff 50%, var(--bg-2) 100%);
  padding: 60px 24px 80px;
  text-align: center;
  position: relative;
}
.hero-badge {
  display: inline-block; font-size: 12px; text-transform: uppercase;
  letter-spacing: 2px; font-weight: 600; color: var(--hot);
  background: var(--hot-dim); padding: 6px 16px; border-radius: 20px;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 60px);
  margin-bottom: 20px; line-height: 1.1; letter-spacing: -1.5px;
}
.hero h1 span { color: var(--accent); }
.hero-sub {
  font-size: 18px; color: var(--fg-2); max-width: 480px;
  margin: 0 auto 40px; line-height: 1.7;
}
.hero-image {
  margin: 40px auto; border-radius: 20px; overflow: hidden;
  max-width: 480px; width: 100%;
  box-shadow: 0 20px 60px rgba(0,196,212,0.18);
}
.hero-image img { width: 100%; display: block; }
.hero-price {
  margin-top: 16px; font-size: 16px; color: var(--fg-2);
}
.hero-price del { color: var(--fg-3); margin-right: 8px; }
.hero-price strong { color: var(--accent); font-size: 20px; font-weight: 800; }

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; border-radius: 14px; text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s; cursor: pointer;
  border: none; font-family: 'DM Sans', sans-serif;
}
.btn-primary {
  background: var(--accent); color: #fff;
  font-size: 17px; padding: 16px 36px;
  box-shadow: 0 8px 32px rgba(0,196,212,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,196,212,0.45); }
.btn-lg { font-size: 19px; padding: 20px 48px; border-radius: 16px; }

/* ── PROBLEM ────────────────────────────────────────────── */
.problem {
  padding: 96px 24px;
  background: var(--fg);
  color: #fff;
}
.problem-inner { max-width: 1100px; margin: 0 auto; }
.problem-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 3px;
  font-weight: 600; color: var(--accent); margin-bottom: 16px;
}
.problem h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 48px; color: #fff;
}
.problem-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.problem-card {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 32px;
}
.problem-card-icon {
  font-size: 36px; margin-bottom: 16px; display: block;
}
.problem-card h3 {
  font-size: 17px; font-weight: 700; margin-bottom: 10px; color: #fff;
}
.problem-card p { font-size: 14px; color: rgba(255,255,255,0.65); line-height: 1.65; }

/* ── SOLUTION ───────────────────────────────────────────── */
.solution {
  padding: 96px 24px;
  background: var(--bg);
}
.solution-inner {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
}
.solution-text {}
.solution-badge {
  display: inline-block; font-size: 11px; text-transform: uppercase;
  letter-spacing: 2px; font-weight: 600; color: var(--accent);
  background: var(--accent-dim); padding: 6px 14px; border-radius: 20px;
  margin-bottom: 20px;
}
.solution h2 {
  font-size: clamp(26px, 3.5vw, 40px); margin-bottom: 20px;
}
.solution-tagline {
  font-size: 20px; font-weight: 600; color: var(--fg-2);
  margin-bottom: 20px; font-style: italic;
}
.solution p { font-size: 16px; color: var(--fg-2); line-height: 1.7; margin-bottom: 36px; }
.solution-features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.solution-feat {
  display: flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 500; color: var(--fg);
}
.solution-feat-check {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent-dim); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; flex-shrink: 0;
}

.solution-img {
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,196,212,0.15);
}
.solution-img img { width: 100%; display: block; }

/* ── DEMO ────────────────────────────────────────────────── */
.demo {
  padding: 80px 24px;
  background: var(--bg-2);
}
.demo-inner { max-width: 1100px; margin: 0 auto; }
.demo-header {
  text-align: center; margin-bottom: 56px;
}
.demo-header .section-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 3px;
  font-weight: 600; color: var(--accent); margin-bottom: 12px;
}
.demo-header h2 { font-size: clamp(24px, 3.5vw, 38px); margin-bottom: 12px; }
.demo-header p { color: var(--fg-2); font-size: 16px; }
.demo-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.demo-card {
  background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: 0 4px 24px var(--shadow); border: 1px solid var(--border);
}
.demo-card-visual {
  aspect-ratio: 4/3; overflow: hidden; position: relative;
}
.demo-card-visual img { width: 100%; height: 100%; object-fit: cover; }
.demo-card-tag {
  position: absolute; top: 12px; left: 12px;
  background: var(--hot); color: #fff; font-size: 11px; font-weight: 700;
  padding: 4px 10px; border-radius: 6px; letter-spacing: 0.5px;
}
.demo-card-tag.cool { background: var(--accent); }
.demo-card-body { padding: 20px; }
.demo-card-body h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.demo-card-body p { font-size: 13px; color: var(--fg-2); }

/* ── ADVANTAGES ─────────────────────────────────────────── */
.advantages { padding: 96px 24px; background: var(--bg); }
.advantages-inner { max-width: 1100px; margin: 0 auto; }
.section-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 3px;
  font-weight: 600; color: var(--accent); margin-bottom: 12px;
}
.advantages h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 56px; }
.advantages-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.adv-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.adv-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px var(--shadow); }
.adv-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--accent-dim); display: flex; align-items: center; justify-content: center;
  font-size: 26px; margin-bottom: 20px;
}
.adv-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.adv-card p { font-size: 14px; color: var(--fg-2); line-height: 1.65; }

/* ── SOCIAL PROOF ───────────────────────────────────────── */
.social-proof { padding: 80px 24px; background: var(--bg-2); }
.social-proof-inner { max-width: 1100px; margin: 0 auto; }
.social-proof-header { text-align: center; margin-bottom: 48px; }
.social-proof-header h2 { font-size: clamp(24px, 3.5vw, 38px); margin-bottom: 12px; }
.social-proof-header p { color: var(--fg-2); }
.social-proof-stats {
  display: flex; justify-content: center; gap: 48px; margin-bottom: 48px;
}
.social-stat { text-align: center; }
.social-stat-num {
  font-family: 'Syne', sans-serif; font-size: 36px; font-weight: 800;
  color: var(--accent); line-height: 1;
}
.social-stat-label { font-size: 13px; color: var(--fg-2); margin-top: 4px; }

.reviews-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.review-card {
  background: #fff; border: 1px solid var(--border);
  border-radius: 16px; padding: 28px;
  box-shadow: 0 2px 12px var(--shadow);
}
.review-stars { margin-bottom: 14px; color: #F59E0B; font-size: 16px; letter-spacing: 2px; }
.review-text { font-size: 15px; color: var(--fg); line-height: 1.65; margin-bottom: 18px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent-dim); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
}
.review-meta { font-size: 13px; }
.review-name { font-weight: 600; color: var(--fg); }
.review-loc { color: var(--fg-3); }

/* ── OFFER ───────────────────────────────────────────────── */
.offer {
  padding: 96px 24px;
  background: linear-gradient(135deg, #0F1B2D 0%, #1A3A4A 100%);
  color: #fff;
}
.offer-inner { max-width: 700px; margin: 0 auto; text-align: center; }
.offer-tag {
  display: inline-block; font-size: 11px; text-transform: uppercase;
  letter-spacing: 2px; font-weight: 600; color: var(--hot);
  background: var(--hot-dim); padding: 6px 16px; border-radius: 20px;
  margin-bottom: 20px;
}
.offer h2 { font-size: clamp(28px, 4.5vw, 48px); color: #fff; margin-bottom: 16px; }
.offer p { color: rgba(255,255,255,0.7); font-size: 16px; margin-bottom: 36px; }

.offer-price-row {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  margin-bottom: 12px;
}
.offer-old-price {
  font-size: 26px; color: rgba(255,255,255,0.4);
  text-decoration: line-through;
}
.offer-new-price {
  font-size: 52px; font-family: 'Syne', sans-serif; font-weight: 800;
  color: var(--accent);
}
.offer-save-badge {
  background: var(--accent); color: #fff;
  font-size: 14px; font-weight: 700; padding: 8px 16px; border-radius: 8px;
}

.stock-bar {
  max-width: 500px; margin: 24px auto 0;
}
.stock-label {
  font-size: 13px; color: rgba(255,255,255,0.6); margin-bottom: 8px;
}
.stock-track {
  background: rgba(255,255,255,0.12); border-radius: 8px; height: 10px;
  overflow: hidden; margin-bottom: 6px;
}
.stock-fill {
  height: 100%; border-radius: 8px;
  background: linear-gradient(90deg, var(--hot), #FF8C5A);
  width: 38%;
  animation: stock-wiggle 3s ease-in-out infinite;
}
@keyframes stock-wiggle {
  0%, 100% { width: 38%; }
  50% { width: 42%; }
}
.stock-count {
  font-size: 14px; font-weight: 700; color: var(--hot);
  animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }

.countdown-wrap {
  display: flex; justify-content: center; gap: 16px; margin: 32px 0;
}
.countdown-unit {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px; padding: 16px 20px; text-align: center;
  min-width: 72px;
}
.countdown-num {
  font-family: 'Syne', sans-serif; font-size: 28px; font-weight: 800; color: #fff;
}
.countdown-label { font-size: 11px; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 1px; margin-top: 2px; }

.offer-cta {
  display: inline-flex; align-items: center; gap: 12px;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 18px;
  padding: 18px 44px; border-radius: 14px; text-decoration: none;
  box-shadow: 0 8px 32px rgba(0,196,212,0.4);
  transition: transform 0.15s, box-shadow 0.15s;
  margin-bottom: 16px;
}
.offer-cta:hover { transform: translateY(-2px); box-shadow: 0 14px 48px rgba(0,196,212,0.5); }
.guarantee { font-size: 13px; color: rgba(255,255,255,0.55); }

/* ── FAQ ─────────────────────────────────────────────────── */
.faq { padding: 96px 24px; background: var(--bg); }
.faq-inner { max-width: 700px; margin: 0 auto; }
.faq h2 { font-size: clamp(24px, 3.5vw, 36px); margin-bottom: 40px; text-align: center; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--border); border-radius: 14px; overflow: hidden;
  background: var(--card);
}
.faq-q {
  width: 100%; background: none; border: none; cursor: pointer;
  padding: 20px 24px; text-align: left; font-size: 15px; font-weight: 600;
  color: var(--fg); display: flex; align-items: center; justify-content: space-between;
  font-family: 'DM Sans', sans-serif;
  gap: 12px;
}
.faq-q:hover { background: var(--bg-2); }
.faq-toggle { font-size: 18px; color: var(--accent); transition: transform 0.2s; flex-shrink: 0; }
.faq-item.open .faq-toggle { transform: rotate(45deg); }
.faq-a {
  display: none; padding: 0 24px 20px;
  font-size: 14px; color: var(--fg-2); line-height: 1.7;
}
.faq-item.open .faq-a { display: block; }

/* ── FINAL CTA ────────────────────────────────────────────── */
.final-cta {
  padding: 96px 24px;
  background: var(--bg-2);
  text-align: center;
}
.final-cta-inner { max-width: 600px; margin: 0 auto; }
.final-cta h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 16px; }
.final-cta p { font-size: 16px; color: var(--fg-2); margin-bottom: 40px; line-height: 1.7; }
.final-cta .offer-cta { font-size: 18px; padding: 18px 48px; }
.final-cta .guarantee { margin-top: 16px; }

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border); padding: 40px 24px;
  background: var(--bg);
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
}
.footer-brand {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: 16px; color: var(--fg);
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 13px; color: var(--fg-3); text-decoration: none; }
.footer-links a:hover { color: var(--fg); }
.footer-copy { font-size: 12px; color: var(--fg-3); }

/* ── INNER (universal container) ─────────────────────────── */
.inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ── SECTION LABELS (shared) ─────────────────────────────── */
.label, .section-label {
  display: block;
  font-size: 11px; text-transform: uppercase; letter-spacing: 3px;
  font-weight: 600; color: var(--accent); margin-bottom: 12px;
}

/* ── PROBLEM LIST (problem.ejs) ──────────────────────────── */
.section-problem { padding: 80px 24px; background: var(--fg); color: #fff; }
.section-problem .label { color: var(--accent); }
.section-problem h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 40px; color: #fff; }
.problem-list { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.problem-list li { display: flex; align-items: center; gap: 16px; }
.problem-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  background: var(--hot-dim); border: 1px solid rgba(255,107,53,0.3);
  display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.problem-list li span:last-child { font-size: 15px; color: rgba(255,255,255,0.8); line-height: 1.5; }

/* ── SOLUTION (solution.ejs) ─────────────────────────────── */
.section-solution { padding: 80px 24px; background: var(--bg); }
.section-solution h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 20px; }
.solution-sub { font-size: 17px; color: var(--fg-2); max-width: 600px; line-height: 1.7; margin-bottom: 40px; }
.solution-card {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px; max-width: 600px;
}
.solution-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.solution-card > p { font-size: 15px; color: var(--fg-2); line-height: 1.7; margin-bottom: 24px; }
.solution-badges { display: flex; flex-wrap: wrap; gap: 10px; }
.badge {
  display: inline-block; font-size: 13px; font-weight: 600;
  background: var(--accent-dim); color: var(--accent);
  padding: 6px 14px; border-radius: 20px;
}

/* ── DEMO CARDS (demo.ejs) ───────────────────────────────── */
.section-demo { padding: 80px 24px; background: var(--bg-2); }
.section-demo h2 { font-size: clamp(22px, 3vw, 34px); margin-bottom: 40px; }
.demo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.demo-visual { aspect-ratio: 4/3; overflow: hidden; position: relative; background: var(--bg-3); }
.demo-visual img { width: 100%; height: 100%; object-fit: cover; }
.demo-tag {
  position: absolute; top: 12px; left: 12px;
  background: var(--hot); color: #fff; font-size: 11px; font-weight: 700;
  padding: 4px 10px; border-radius: 6px;
}
.demo-tag.cool { background: var(--accent); }
.demo-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; gap: 12px; color: var(--fg-2); font-size: 14px; text-align: center;
  padding: 20px;
}
.demo-placeholder-icon { font-size: 48px; }
.demo-body { padding: 20px; }
.demo-label { font-size: 10px; font-weight: 700; letter-spacing: 2px; color: var(--accent); text-transform: uppercase; margin-bottom: 6px; }
.demo-body h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.demo-body p { font-size: 13px; color: var(--fg-2); }

/* ── BENEFITS GRID (advantages.ejs) ──────────────────────── */
.section-benefits { padding: 80px 24px; background: var(--bg); }
.section-benefits h2 { font-size: clamp(24px, 3.5vw, 38px); margin-bottom: 48px; }
.benefits-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; max-width: 800px; }
.benefit-card { display: flex; align-items: flex-start; gap: 16px; padding: 24px; background: var(--card); border: 1px solid var(--border); border-radius: 14px; }
.benefit-icon { font-size: 28px; flex-shrink: 0; margin-top: 2px; }
.benefit-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.benefit-card p { font-size: 13px; color: var(--fg-2); line-height: 1.6; }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .advantages-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .social-proof-stats { gap: 24px; }
  .benefits-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .problem-grid { grid-template-columns: 1fr; }
  .solution-inner { grid-template-columns: 1fr; }
  .solution-img { margin-top: 40px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .countdown-wrap { gap: 10px; }
  .countdown-unit { min-width: 60px; padding: 12px 14px; }
  .countdown-num { font-size: 22px; }
  .btn-lg { width: 100%; justify-content: center; }
  .offer-new-price { font-size: 40px; }
}