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

/* ── Dark mode (default) ── */
:root {
  --color-bg: #0f0f13;
  --color-surface: #16161d;
  --color-surface2: #1e1e28;
  --color-border: rgba(255,255,255,0.08);
  --color-text: #f0f0f5;
  --color-text-muted: #8888a0;
  --color-white: #ffffff;
  --color-nav-bg: rgba(15,15,19,0.9);
  --color-hero-bg: rgba(15,15,19,0.6);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-w: 1100px;
}

/* ── Light mode ── */
[data-theme="light"] {
  --color-bg: #f4f4f8;
  --color-surface: #ffffff;
  --color-surface2: #eaeaf2;
  --color-border: rgba(0,0,0,0.09);
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a72;
  --color-white: #1a1a2e;
  --color-nav-bg: rgba(244,244,248,0.92);
  --color-hero-bg: rgba(244,244,248,0.7);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.08);
}

/* Light mode specific overrides */
[data-theme="light"] body { color: var(--color-text); }
[data-theme="light"] p { color: var(--color-text-muted); }
[data-theme="light"] .nav { background: var(--color-nav-bg); }
[data-theme="light"] .hero-bg-gradient,
[data-theme="light"] .hero-bg-gradient2 { opacity: 0.07; }
[data-theme="light"] .problem-section { background: var(--color-surface); }
[data-theme="light"] .presale-section { background: var(--color-surface); }
[data-theme="light"] .strategy-section { background: #eaeaf4; }
[data-theme="light"] .form-section { background: var(--color-bg); }
[data-theme="light"] .book-cover-brand { color: rgba(255,255,255,0.85); }
[data-theme="light"] .presale-card { background: var(--color-surface2); }
[data-theme="light"] .presale-glow { opacity: 0.05; }
[data-theme="light"] .book-card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.12); }
[data-theme="light"] .footer { background: var(--color-surface); }
[data-theme="light"] .stat-num { color: #1a1a2e; }
[data-theme="light"] .faq-question { background: var(--color-surface); color: #1a1a2e; }
[data-theme="light"] .faq-question:hover { background: var(--color-surface2); }
[data-theme="light"] .faq-answer { background: var(--color-surface); }
[data-theme="light"] .form-input,
[data-theme="light"] .form-select,
[data-theme="light"] .form-textarea { color: #1a1a2e; background: var(--color-surface2); }
[data-theme="light"] .module-item { background: var(--color-surface2); }
[data-theme="light"] .resource-item { background: var(--color-surface2); }
[data-theme="light"] .profile-item { background: var(--color-surface2); }
[data-theme="light"] .bonus-card { background: var(--color-surface2); }
[data-theme="light"] .day-card { background: var(--color-surface); }
[data-theme="light"] .collection-label { color: #4338ca; background: rgba(67,56,202,0.08); border-color: rgba(67,56,202,0.2); }
[data-theme="light"] .validation-banner { color: #b45309; background: rgba(234,179,8,0.06); border-color: rgba(234,179,8,0.25); }
[data-theme="light"] .top-badge { color: #b45309; background: rgba(234,179,8,0.06); border-color: rgba(234,179,8,0.25); }
[data-theme="light"] .btn-outline { border-color: var(--color-border); color: var(--color-text-muted); }
[data-theme="light"] .btn-outline:hover { border-color: rgba(0,0,0,0.2); color: var(--color-text); }

/* Theme toggle button */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: rgba(99,102,241,0.4);
}

/* System preference fallback (when no manual toggle set) */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --color-bg: #f4f4f8;
    --color-surface: #ffffff;
    --color-surface2: #eaeaf2;
    --color-border: rgba(0,0,0,0.09);
    --color-text: #1a1a2e;
    --color-text-muted: #5a5a72;
    --color-white: #1a1a2e;
    --color-nav-bg: rgba(244,244,248,0.92);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
  }
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
p { color: var(--color-text-muted); }

.serif { font-family: var(--font-serif); }
.text-white { color: var(--color-white); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }

/* ===== LAYOUT ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.gap-8 { gap: 32px; }

/* ===== COMPONENTS ===== */

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--color-border);
  background: var(--color-surface2);
  color: var(--color-text-muted);
}
.badge-accent {
  background: rgba(99,102,241,0.15);
  border-color: rgba(99,102,241,0.3);
  color: #a5b4fc;
}

/* Card */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}
.card:hover {
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent, #6366f1);
  color: white;
}
.btn-primary:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(99,102,241,0.35);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.btn-outline:hover {
  border-color: rgba(255,255,255,0.25);
  color: var(--color-white);
}
.btn-lg { padding: 18px 36px; font-size: 1.1rem; }
.btn-full { width: 100%; }

/* Divider */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 40px 0;
}

/* Section header */
.section-header {
  margin-bottom: 48px;
}
.section-header .badge {
  margin-bottom: 16px;
}
.section-header h2 {
  margin-bottom: 12px;
}

/* ===== NAVIGATION ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-white);
}
.nav-cta {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 0;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg-gradient {
  position: absolute;
  top: -200px;
  right: -200px;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.12;
  background: var(--accent, #6366f1);
}
.hero-bg-gradient2 {
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.06;
  background: var(--accent, #6366f1);
}
.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-text { max-width: 560px; }
.hero-badge { margin-bottom: 24px; }
.hero-title {
  font-family: var(--font-serif);
  margin-bottom: 20px;
  color: var(--color-white);
}
.hero-title span {
  display: block;
  background: var(--accent-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}
.hero-promise {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 32px;
}
.hero-promise-icon { font-size: 1.25rem; flex-shrink: 0; }
.hero-promise-text { font-size: 0.9rem; color: var(--color-text-muted); }
.hero-promise-text strong { color: var(--color-white); }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }

/* Book mockup */
.book-mockup {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.book-cover {
  width: 260px;
  height: 360px;
  border-radius: 8px 16px 16px 8px;
  position: relative;
  overflow: hidden;
  box-shadow: -8px 8px 32px rgba(0,0,0,0.5), 4px 4px 0 rgba(0,0,0,0.3);
  transform: perspective(800px) rotateY(-8deg);
  transition: transform 0.5s ease;
}
.book-cover:hover {
  transform: perspective(800px) rotateY(-4deg);
}
.book-cover-inner {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px 24px;
  position: relative;
}
.book-cover-bg {
  position: absolute;
  inset: 0;
  background: var(--accent-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
}
.book-cover-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: radial-gradient(circle at 2px 2px, white 1px, transparent 0);
  background-size: 24px 24px;
}
.book-cover-content { position: relative; z-index: 1; color: white; }
.book-cover-emoji { font-size: 2.5rem; margin-bottom: 12px; }
.book-cover-category {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 12px;
}
.book-cover-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 6px;
}
.book-cover-subtitle {
  font-size: 0.65rem;
  opacity: 0.75;
  line-height: 1.4;
}
.book-cover-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 12px;
}
.book-cover-brand {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: white;
  opacity: 0.6;
}
.book-glow {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: var(--accent, #6366f1);
  filter: blur(60px);
  opacity: 0.15;
  z-index: -1;
}

/* ===== PROBLEM SECTION ===== */
.problem-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.problem-list { display: flex; flex-direction: column; gap: 16px; }
.problem-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}
.problem-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.problem-text strong { display: block; color: var(--color-white); margin-bottom: 4px; }

/* ===== CONTENT SECTION ===== */
.module-list { display: flex; flex-direction: column; gap: 12px; }
.module-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface2);
}
.module-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent, #6366f1);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.module-text { color: var(--color-text-muted); font-size: 0.9rem; }

/* Resources */
.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.resource-item {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.resource-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(16,185,129,0.15);
  color: #10b981;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  flex-shrink: 0;
}

/* ===== FOR WHO SECTION ===== */
.profile-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.profile-item {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.profile-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent, #6366f1);
  flex-shrink: 0;
}

/* ===== BONUS SECTION ===== */
.bonus-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.bonus-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
}
.bonus-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.bonus-title { font-weight: 600; color: var(--color-white); margin-bottom: 8px; font-size: 0.95rem; }
.bonus-desc { font-size: 0.85rem; color: var(--color-text-muted); }

/* ===== PRESALE SECTION ===== */
.presale-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.presale-card {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  position: relative;
  overflow: hidden;
}
.presale-glow {
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: var(--accent, #6366f1);
  filter: blur(80px);
  opacity: 0.08;
}
.presale-content { position: relative; z-index: 1; }
.presale-label {
  display: inline-block;
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.3);
  color: #f87171;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.presale-price { display: flex; align-items: baseline; gap: 12px; margin: 20px 0; }
.presale-price-current {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-white);
}
.presale-price-original {
  font-size: 1.2rem;
  text-decoration: line-through;
  color: var(--color-text-muted);
}
.presale-price-discount {
  background: rgba(16,185,129,0.15);
  color: #10b981;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
}
.presale-features { margin: 24px 0; display: flex; flex-direction: column; gap: 10px; }
.presale-feature {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.presale-feature-check { color: #10b981; font-weight: 700; }
.presale-note {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* ===== FORM SECTION ===== */
.form-section { background: var(--color-bg); }
.form-wrapper {
  max-width: 600px;
  margin: 0 auto;
}
.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
}
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--color-text);
  transition: var(--transition);
  outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent, #6366f1);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.form-input::placeholder, .form-textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.5;
}
.form-select option { background: var(--color-surface2); }
.form-textarea { resize: vertical; min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Form success state */
.form-success {
  display: none;
  text-align: center;
  padding: 48px 24px;
}
.form-success.visible { display: block; }
.form-success-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
}
.form-success h3 { color: var(--color-white); margin-bottom: 12px; }

/* ===== FAQ SECTION ===== */
.faq-list { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  color: var(--color-white);
  background: var(--color-surface);
  font-size: 0.95rem;
  gap: 16px;
}
.faq-question:hover { background: var(--color-surface2); }
.faq-icon { flex-shrink: 0; transition: var(--transition); font-size: 1.1rem; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  background: var(--color-surface);
}
.faq-answer-inner { padding: 0 24px 20px; font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.7; }

/* ===== FOOTER ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
  text-align: center;
}
.footer-brand { font-size: 1.1rem; font-weight: 700; color: var(--color-white); margin-bottom: 12px; }
.footer-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}
.footer-links { display: flex; gap: 24px; justify-content: center; margin: 20px 0; flex-wrap: wrap; }
.footer-link { font-size: 0.875rem; color: var(--color-text-muted); transition: var(--transition); }
.footer-link:hover { color: var(--color-white); }

/* ===== INDEX PAGE ===== */
.index-hero {
  padding: 100px 0 60px;
  text-align: center;
  position: relative;
}
.index-hero-title {
  font-family: var(--font-serif);
  color: var(--color-white);
  margin: 16px 0 20px;
}
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.book-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}
.book-card:hover {
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.book-card-emoji {
  font-size: 2.2rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-surface2);
}
.book-card-category {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}
.book-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.3;
}
.book-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex: 1;
  line-height: 1.6;
}
.book-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.book-card-price { font-size: 0.85rem; font-weight: 600; }
.book-card-cta {
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.book-card:hover .book-card-cta { color: var(--color-white); }

/* Filter bar */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.filter-btn {
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--color-surface);
  border-color: rgba(255,255,255,0.2);
  color: var(--color-white);
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 40px;
  justify-content: center;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin: 40px 0;
}
.stat-item { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 800; color: var(--color-white); }
.stat-label { font-size: 0.8rem; color: var(--color-text-muted); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; }
  .book-mockup { order: -1; }
  .book-cover { width: 200px; height: 280px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .bonus-grid { grid-template-columns: repeat(2, 1fr); }
  .presale-card { padding: 32px 24px; }
  .stats-bar { gap: 20px; flex-wrap: wrap; }
}

@media (max-width: 640px) {
  .section { padding: 56px 0; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .bonus-grid { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
  .profile-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 32px 24px; }
  .hero-ctas { flex-direction: column; }
  .nav-cta { display: none; }
  .presale-price-current { font-size: 2.2rem; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: perspective(800px) rotateY(-8deg) translateY(0px); }
  50% { transform: perspective(800px) rotateY(-8deg) translateY(-8px); }
}
.animate-fade-up { animation: fadeUp 0.6s ease forwards; }
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.book-cover { animation: float 5s ease-in-out infinite; }

/* Scroll animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== UTILITY ===== */
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.w-full { width: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }