/* =====================================================
 * KingSeedance Landing v3 — Modern dark theme
 * Thiết kế lại hoàn toàn, có tổ chức hơn.
 * Mobile-first, gradient + glassmorphism nhẹ.
 * ===================================================== */

:root {
  --ks-bg: #07050f;
  --ks-bg-2: #0d0820;
  --ks-surface: rgba(255, 255, 255, 0.04);
  --ks-surface-2: rgba(255, 255, 255, 0.07);
  --ks-border: rgba(255, 255, 255, 0.08);
  --ks-border-strong: rgba(139, 92, 246, 0.3);
  --ks-text: #f4f4f5;
  --ks-text-dim: #a1a1aa;
  --ks-text-mute: #71717a;
  --ks-accent: #a78bfa;
  --ks-accent-2: #f472b6;
  --ks-success: #34d399;
  --ks-radius: 14px;
  --ks-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --ks-container: 1200px;
}

/* === Layout helpers === */
.ks-container {
  width: 100%;
  max-width: var(--ks-container);
  margin: 0 auto;
  padding: 0 24px;
}
.ks-section { padding: 80px 0; }
.ks-section--alt { background: linear-gradient(180deg, transparent 0%, var(--ks-bg-2) 100%); }
.ks-section-header { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.ks-section-header h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin: 12px 0 14px;
  background: linear-gradient(135deg, #fff 0%, #d8b4fe 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}
.ks-section-header p { color: var(--ks-text-dim); font-size: 17px; line-height: 1.6; }
.ks-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--ks-surface-2);
  border: 1px solid var(--ks-border);
  color: var(--ks-accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* === Hero === */
.ks-hero {
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(139, 92, 246, 0.25), transparent 70%),
    radial-gradient(800px 500px at 10% 10%, rgba(244, 114, 182, 0.18), transparent 60%),
    var(--ks-bg);
}
.ks-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}
.ks-hero-content h1 {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 18px 0 20px;
}
.ks-hero-content h1 .ks-grad {
  background: linear-gradient(135deg, var(--ks-accent) 0%, var(--ks-accent-2) 50%, #fb923c 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ks-hero-content p.ks-lead {
  font-size: 18px;
  color: var(--ks-text-dim);
  line-height: 1.65;
  margin-bottom: 32px;
  max-width: 540px;
}
.ks-hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 36px; }

.ks-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 200ms ease;
  font-family: inherit;
}
.ks-btn--primary {
  background: linear-gradient(135deg, var(--ks-accent) 0%, var(--ks-accent-2) 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35);
}
.ks-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(139, 92, 246, 0.5); }
.ks-btn--ghost {
  background: var(--ks-surface);
  color: var(--ks-text);
  border-color: var(--ks-border);
}
.ks-btn--ghost:hover { background: var(--ks-surface-2); border-color: var(--ks-border-strong); }

.ks-stats {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.ks-stat strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, #c4b5fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ks-stat span { color: var(--ks-text-mute); font-size: 13px; }
.ks-stat + .ks-stat { padding-left: 28px; border-left: 1px solid var(--ks-border); }

/* Hero visual mockup */
.ks-hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}
.ks-mock-app {
  position: relative;
  width: 100%;
  max-width: 460px;
  border-radius: 20px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.1) 0%, rgba(244, 114, 182, 0.08) 100%);
  border: 1px solid var(--ks-border-strong);
  box-shadow: var(--ks-shadow);
  padding: 14px;
}
.ks-mock-app .ks-mock-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px 12px;
}
.ks-mock-app .ks-mock-bar i {
  width: 10px; height: 10px; border-radius: 50%;
  display: inline-block;
}
.ks-mock-app .ks-mock-bar i:nth-child(1) { background: #ef4444; }
.ks-mock-app .ks-mock-bar i:nth-child(2) { background: #f59e0b; }
.ks-mock-app .ks-mock-bar i:nth-child(3) { background: #22c55e; }
.ks-mock-app .ks-mock-bar .ks-mock-title {
  margin-left: 12px;
  font-size: 12px;
  color: var(--ks-text-mute);
}
.ks-mock-app .ks-mock-body {
  background: linear-gradient(180deg, #0d0820 0%, #1a0f2e 100%);
  border-radius: 14px;
  padding: 18px;
  min-height: 320px;
}
.ks-mock-app .ks-mock-prompt {
  font-size: 12px;
  color: var(--ks-text-mute);
  margin-bottom: 6px;
  font-weight: 600;
}
.ks-mock-app .ks-mock-input {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--ks-border);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--ks-text);
  font-size: 13px;
  margin-bottom: 16px;
  min-height: 70px;
}
.ks-mock-app .ks-mock-thumbs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.ks-mock-thumb {
  aspect-ratio: 16/10;
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}
.ks-mock-thumb:nth-child(1) { background: linear-gradient(135deg, #f472b6, #fb923c); }
.ks-mock-thumb:nth-child(2) { background: linear-gradient(135deg, #8b5cf6, #06b6d4); }
.ks-mock-thumb:nth-child(3) { background: linear-gradient(135deg, #22c55e, #06b6d4); }
.ks-mock-thumb:nth-child(4) { background: linear-gradient(135deg, #ef4444, #f59e0b); }
.ks-mock-thumb::after {
  content: '▶';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 22px; opacity: 0.85;
}

/* === Features === */
.ks-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.ks-feature-card {
  padding: 28px;
  border-radius: var(--ks-radius);
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
  transition: all 250ms ease;
}
.ks-feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--ks-border-strong);
  background: var(--ks-surface-2);
}
.ks-feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(244, 114, 182, 0.15));
  display: flex; align-items: center; justify-content: center;
  color: var(--ks-accent);
  margin-bottom: 16px;
}
.ks-feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.ks-feature-card p { color: var(--ks-text-dim); font-size: 14px; line-height: 1.6; }

/* === Use cases === */
.ks-usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.ks-usecase-card {
  padding: 24px;
  border-radius: var(--ks-radius);
  background: linear-gradient(135deg, rgba(139, 92,246,0.08), rgba(244, 114, 182, 0.05));
  border: 1px solid var(--ks-border);
}
.ks-usecase-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.ks-usecase-card p { font-size: 14px; color: var(--ks-text-dim); line-height: 1.55; }

/* === Steps === */
.ks-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
}
.ks-step {
  padding: 28px;
  border-radius: var(--ks-radius);
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
  text-align: left;
  position: relative;
}
.ks-step-num {
  position: absolute;
  top: -16px; left: 24px;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 14px; color: #fff;
  box-shadow: 0 6px 18px rgba(139, 92, 246, 0.4);
}
.ks-step h3 { font-size: 18px; font-weight: 700; margin: 16px 0 8px; }
.ks-step p { color: var(--ks-text-dim); font-size: 14px; line-height: 1.6; }

/* === Gallery === */
.ks-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.ks-gallery-item {
  aspect-ratio: 16/10;
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  cursor: pointer;
  transition: transform 250ms ease;
}
.ks-gallery-item:hover { transform: scale(1.02); }
.ks-gallery-item:nth-child(1) { background: linear-gradient(135deg, #f472b6, #fb923c); }
.ks-gallery-item:nth-child(2) { background: linear-gradient(135deg, #8b5cf6, #06b6d4); }
.ks-gallery-item:nth-child(3) { background: linear-gradient(135deg, #22c55e, #06b6d4); }
.ks-gallery-item:nth-child(4) { background: linear-gradient(135deg, #ef4444, #f59e0b); }
.ks-gallery-item:nth-child(5) { background: linear-gradient(135deg, #6366f1, #ec4899); }
.ks-gallery-item:nth-child(6) { background: linear-gradient(135deg, #14b8a6, #a855f7); }
.ks-gallery-item::after {
  content: '▶';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.95); font-size: 30px;
  text-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.ks-gallery-item .ks-gallery-label {
  position: absolute;
  bottom: 12px; left: 12px;
  font-size: 12px;
  font-weight: 600;
  color: white;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(8px);
  padding: 4px 10px;
  border-radius: 6px;
}

/* === FAQ === */
.ks-faq { max-width: 760px; margin: 0 auto; }
.ks-faq-item {
  border: 1px solid var(--ks-border);
  border-radius: 12px;
  margin-bottom: 12px;
  background: var(--ks-surface);
  overflow: hidden;
  transition: all 200ms ease;
}
.ks-faq-item.open { border-color: var(--ks-border-strong); }
.ks-faq-q {
  width: 100%;
  padding: 18px 22px;
  background: transparent;
  border: none;
  color: var(--ks-text);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
}
.ks-faq-q .ks-faq-icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--ks-surface-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; line-height: 1;
  transition: all 200ms ease;
}
.ks-faq-item.open .ks-faq-icon { background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2)); transform: rotate(45deg); }
.ks-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease;
}
.ks-faq-item.open .ks-faq-a { max-height: 320px; }
.ks-faq-a p { padding: 0 22px 18px; color: var(--ks-text-dim); font-size: 14px; line-height: 1.65; }

/* === Final CTA === */
.ks-cta {
  padding: 80px 0;
  text-align: center;
}
.ks-cta-card {
  max-width: 800px;
  margin: 0 auto;
  padding: 56px 32px;
  border-radius: 20px;
  background:
    radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.3), transparent 60%),
    var(--ks-surface);
  border: 1px solid var(--ks-border-strong);
  box-shadow: var(--ks-shadow);
}
.ks-cta-card h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin: 0 0 14px; }
.ks-cta-card p { color: var(--ks-text-dim); margin-bottom: 28px; font-size: 17px; }
.ks-cta-trust {
  display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;
  margin-top: 24px;
  color: var(--ks-text-mute); font-size: 13px;
}
.ks-cta-trust span { display: inline-flex; align-items: center; gap: 6px; }

/* === Responsive === */
@media (max-width: 900px) {
  .ks-hero { padding: 80px 0 60px; }
  .ks-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .ks-hero-visual { order: -1; }
  .ks-mock-app { max-width: 380px; }
  .ks-steps { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .ks-section { padding: 60px 0; }
  .ks-stats { gap: 18px; }
  .ks-stat + .ks-stat { padding-left: 18px; }
  .ks-stat strong { font-size: 22px; }
  .ks-hero-actions .ks-btn { width: 100%; justify-content: center; }
}