:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --success: #10b981;
  --danger: #ef4444;
  --bg: #0f172a;
  --bg-light: #1e293b;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border: #334155;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -4px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(99,102,241,0.3);
  --max-width: 1200px;
  --header-h: 64px;
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

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

.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  background: var(--bg-light);
  border-color: var(--primary);
}

.btn-lg { padding: 16px 32px; font-size: 1.1rem; }
.btn-block { width: 100%; }

/* Header */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(15,23,42,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color var(--transition);
}
.header.scrolled { border-color: var(--border); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.logo span { color: var(--primary-light); }

.nav { display: none; gap: 32px; }
.nav a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
}
.nav a:hover { color: var(--text); }

.cart-btn {
  position: relative;
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text);
  width: 44px; height: 44px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
}
.cart-btn:hover { border-color: var(--primary); background: var(--bg-card); }

.cart-count {
  position: absolute;
  top: -6px; right: -6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  width: 20px; height: 20px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
}

/* Hero */
.hero {
  position: relative;
  padding: 140px 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(99,102,241,0.18), transparent),
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(6,182,212,0.12), transparent),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(99,102,241,0.08), transparent);
  pointer-events: none;
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-particles span {
  position: absolute;
  display: block;
  width: 4px; height: 4px;
  background: rgba(99,102,241,0.4);
  border-radius: 50%;
  animation: floatUp 8s infinite ease-in;
}
.hero-particles span:nth-child(1) { left: 10%; top: 100%; animation-delay: 0s; animation-duration: 7s; }
.hero-particles span:nth-child(2) { left: 25%; top: 100%; animation-delay: 2s; animation-duration: 9s; width: 6px; height: 6px; }
.hero-particles span:nth-child(3) { left: 45%; top: 100%; animation-delay: 4s; animation-duration: 6s; }
.hero-particles span:nth-child(4) { left: 65%; top: 100%; animation-delay: 1s; animation-duration: 10s; width: 5px; height: 5px; background: rgba(6,182,212,0.4); }
.hero-particles span:nth-child(5) { left: 80%; top: 100%; animation-delay: 3s; animation-duration: 8s; }
.hero-particles span:nth-child(6) { left: 90%; top: 100%; animation-delay: 5s; animation-duration: 7s; width: 3px; height: 3px; background: rgba(6,182,212,0.5); }
@keyframes floatUp {
  0% { transform: translateY(0) scale(1); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-120vh) scale(0.5); opacity: 0; }
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content { text-align: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  color: var(--primary-light);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  max-width: 700px;
  margin: 0 auto 20px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 32px;
  line-height: 1.65;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stats .stat {
  text-align: center;
}
.hero-stats .stat strong {
  display: block;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
}
.hero-stats .stat span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Hero Visual */
.hero-visual {
  display: none;
  position: relative;
  height: 420px;
}

.visual-card {
  position: absolute;
  background: rgba(30,41,59,0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-lg);
  animation: floatCard 6s ease-in-out infinite;
}
.visual-card.v1 {
  top: 0; left: 10%;
  display: flex;
  align-items: center;
  gap: 14px;
  animation-delay: 0s;
}
.visual-card.v2 {
  top: 30%; right: 0;
  width: 260px;
  animation-delay: 1.5s;
}
.visual-card.v3 {
  bottom: 0; left: 20%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  animation-delay: 3s;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.v-icon {
  font-size: 1.6rem;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(99,102,241,0.15);
  border-radius: var(--radius);
}
.v-text { display: flex; flex-direction: column; }
.v-label { font-size: 0.75rem; color: var(--text-dim); }
.v-value { font-size: 0.9rem; font-weight: 700; color: var(--text); }

.v-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
  background: rgba(6,182,212,0.12);
  padding: 3px 8px;
  border-radius: 6px;
  margin-bottom: 10px;
}
.v-prompt {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 8px;
  font-size: 0.8rem;
}
.v-prompt.ai { margin-bottom: 0; }
.v-user {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--primary-light);
}
.v-user.ai { color: var(--accent); }
.v-msg {
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.v-chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 60px;
}
.v-chart .bar {
  width: 10px;
  height: var(--h);
  background: var(--border);
  border-radius: 4px;
  transition: all var(--transition);
}
.v-chart .bar.active {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  box-shadow: 0 0 10px rgba(99,102,241,0.4);
}

/* Sections */
.section { padding: 80px 0; }
.section-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 48px;
  font-size: 1.05rem;
}

/* Grid */
.grid-2, .grid-3 {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }

/* Cards */
.card-icon {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}
.card-icon:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-icon .icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.card-icon h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.card-icon p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Courses */
.cursos { background: linear-gradient(180deg, var(--bg) 0%, rgba(30,41,59,0.4) 100%); }

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition);
}
.course-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.course-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(99,102,241,0.08), var(--bg-card));
}

.course-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  align-self: flex-start;
}
.course-badge.starter {
  background: rgba(6,182,212,0.15);
  color: var(--accent);
}
.course-badge.advanced {
  background: rgba(99,102,241,0.2);
  color: var(--primary-light);
}

.course-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.course-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex: 1;
}

.course-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 20px;
}
.course-price .price {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text);
}
.course-price .price-note {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.course-features {
  list-style: none;
  margin-bottom: 24px;
}
.course-features li {
  padding: 6px 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  border-bottom: 1px solid rgba(51,65,85,0.5);
}
.course-features li:last-child { border-bottom: none; }

/* Bundle */
.bundle-box {
  margin-top: 40px;
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(6,182,212,0.1));
  border: 1.5px dashed var(--primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}
.bundle-box h3 { font-size: 1.2rem; }
.bundle-box p { color: var(--text-muted); font-size: 0.95rem; }

.bundle-price {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.price-old {
  text-decoration: line-through;
  color: var(--text-dim);
  font-size: 1.2rem;
}
.price-new {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.price-save {
  background: rgba(6,182,212,0.2);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Para quién */
.check-list, .cross-list { list-style: none; }
.check-list li, .cross-list li {
  padding: 10px 0;
  padding-left: 28px;
  position: relative;
  color: var(--text-muted);
}
.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}
.cross-list li::before {
  content: '✕';
  position: absolute;
  left: 0;
  color: var(--danger);
  font-weight: 700;
}

/* Testimonials */
.testimonials { background: var(--bg-light); }

.testimonial {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}
.testimonial:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author img {
  width: 44px; height: 44px;
  border-radius: 50%;
  object-fit: cover;
}
.author strong { display: block; font-size: 0.95rem; }
.author span { font-size: 0.85rem; color: var(--text-dim); }

/* Guarantee */
.guarantee-box {
  text-align: center;
  background: linear-gradient(135deg, rgba(16,185,129,0.1), rgba(6,182,212,0.08));
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  margin-bottom: 64px;
}
.guarantee-icon { font-size: 3rem; margin-bottom: 16px; }
.guarantee-box h2 { font-size: 1.6rem; margin-bottom: 12px; }
.guarantee-box p { color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}
.faq-item h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  cursor: pointer;
}
.faq-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 700px;
}

/* Sticky CTA */
.sticky-cta {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: rgba(15,23,42,0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  padding: 16px 0;
  z-index: 90;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}
.sticky-cta.visible { transform: translateY(0); }
.sticky-cta .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.sticky-cta span { font-weight: 600; font-size: 0.95rem; }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.footer-links {
  margin-top: 12px;
  display: flex;
  justify-content: center;
  gap: 24px;
}
.footer-links a { transition: color var(--transition); }
.footer-links a:hover { color: var(--text); }

/* Cart Sidebar */
.cart-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.cart-overlay.open { opacity: 1; visibility: visible; }

.cart-sidebar {
  position: fixed;
  top: 0; right: 0;
  width: 100%;
  max-width: 420px;
  height: 100%;
  background: var(--bg);
  border-left: 1px solid var(--border);
  z-index: 210;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.cart-sidebar.open { transform: translateX(0); }

.cart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}
.cart-header h3 { font-size: 1.2rem; }

.cart-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition);
}
.cart-close:hover { color: var(--text); }

.cart-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
}

.cart-empty-state {
  text-align: center;
  padding: 40px 20px;
}
.cart-empty-icon { font-size: 3rem; margin-bottom: 12px; }
.cart-empty-state p { color: var(--text-muted); margin-bottom: 20px; }

.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.cart-item-info { flex: 1; }
.cart-item-info strong { display: block; margin-bottom: 4px; }
.cart-item-desc { font-size: 0.8rem; color: var(--text-dim); display: block; }

.cart-item-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.qty-control {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  padding: 2px;
}
.qty-btn {
  width: 28px; height: 28px;
  border: none;
  background: var(--bg-card);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  transition: background var(--transition);
}
.qty-btn:hover { background: var(--border); }

.cart-item-price {
  font-weight: 700;
  color: var(--text);
}
.cart-item-remove {
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition);
}
.cart-item-remove:hover { opacity: 1; }

.cart-footer {
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-light);
}
.cart-total {
  display: flex;
  justify-content: space-between;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  color: var(--text);
  padding: 14px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== CHECKOUT ========== */
.checkout-page { background: var(--bg); }

.checkout-header {
  position: static;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.checkout-steps {
  display: none;
  gap: 12px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.checkout-steps .step.active { color: var(--primary-light); font-weight: 600; }
.checkout-steps .step-sep { color: var(--text-dim); }

.checkout-main { padding: 40px 0 80px; }

.checkout-grid {
  display: grid;
  gap: 40px;
}

.checkout-form-section h1 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.checkout-subtitle {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.checkout-form fieldset {
  border: none;
  margin-bottom: 32px;
}
.checkout-form legend {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: block;
  width: 100%;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-group input.valid { border-color: var(--success); }
.form-group input.invalid { border-color: var(--danger); }

.error-msg {
  display: none;
  font-size: 0.8rem;
  color: var(--danger);
  margin-top: 4px;
}

/* Payment placeholder */
.payment-placeholder {
  background: var(--bg-light);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}
.payment-placeholder-icon { font-size: 2rem; margin-bottom: 8px; }
.payment-placeholder p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 16px; }

.payment-methods {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 20px;
}
.payment-methods span {
  background: var(--bg-card);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.gateway-container {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: left;
}
.gateway-note {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  line-height: 1.6;
}
.mock-gateway {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.95rem;
}
.mock-gateway input { width: auto; }

.checkout-submit { margin-top: 8px; }
.secure-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 12px;
}

/* Summary sidebar */
.checkout-summary { order: -1; }

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: 24px;
}
.summary-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.summary-item-info strong { display: block; font-size: 0.95rem; }
.summary-item-info span { font-size: 0.8rem; color: var(--text-dim); }
.summary-item-price { font-weight: 600; white-space: nowrap; }

.summary-divider { height: 1px; background: var(--border); margin: 12px 0; }

.summary-line {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.summary-line.total {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.summary-guarantee {
  margin-top: 20px;
  padding: 16px;
  background: rgba(16,185,129,0.08);
  border: 1px solid rgba(16,185,129,0.2);
  border-radius: var(--radius-sm);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.summary-guarantee span { font-size: 1.3rem; }
.summary-guarantee p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.modal-overlay.open { opacity: 1; visibility: visible; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}
.modal h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.modal p { color: var(--text-muted); margin-bottom: 24px; }

.spinner {
  width: 48px; height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.success-icon { font-size: 3.5rem; margin-bottom: 12px; }

/* ========== RESPONSIVE ========== */
@media (min-width: 640px) {
  .hero h1 { font-size: 3rem; }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr 1fr; }
  .checkout-steps { display: flex; }
}

@media (min-width: 768px) {
  .nav { display: flex; }
  .hero h1 { font-size: 3.5rem; }
  .section-title { font-size: 2.4rem; }
  .hero-grid { grid-template-columns: 1.1fr 1fr; gap: 64px; }
  .hero-content { text-align: left; }
  .hero h1 { margin-left: 0; }
  .hero-subtitle { margin-left: 0; }
  .hero-cta { flex-direction: row; justify-content: flex-start; }
  .hero-stats { justify-content: flex-start; }
  .hero-visual { display: block; }
  .checkout-grid { grid-template-columns: 1fr 380px; }
  .checkout-summary { order: 1; }
  .sticky-cta .container { justify-content: center; gap: 24px; }
}

@media (min-width: 1024px) {
  .hero { padding: 160px 0 120px; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* Selection */
::selection {
  background: rgba(99,102,241,0.3);
  color: var(--text);
}