/* ============================================================
   Я та ШІ — modern landing
   Vector: AI startup × premium education
   ============================================================ */

:root {
  /* Base */
  --bg: #FAFAF7;
  --bg-card: #FFFFFF;
  --bg-soft: #F4F3EE;
  --bg-dark: #0A0A1F;
  --bg-darker: #050511;

  --ink: #0A0A1F;
  --ink-soft: #3D3D4F;
  --ink-mute: #6E6E80;
  --ink-faint: #A8A8B5;

  --border: rgba(10, 10, 31, 0.08);
  --border-strong: rgba(10, 10, 31, 0.16);

  --accent-grad: linear-gradient(135deg, #FF6B47 0%, #FB923C 50%, #F59E0B 100%);
  --accent-coral: #FF6B47;
  --accent-orange: #FB923C;
  --accent-amber: #F59E0B;

  --cool: #4F46E5;
  --cool-soft: #818CF8;

  --radius: 24px;
  --radius-lg: 32px;
  --radius-sm: 12px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(10,10,31,0.04), 0 0 0 1px rgba(10,10,31,0.04);
  --shadow-md: 0 4px 12px rgba(10,10,31,0.06), 0 0 0 1px rgba(10,10,31,0.05);
  --shadow-lg: 0 24px 64px -20px rgba(10,10,31,0.18), 0 0 0 1px rgba(10,10,31,0.06);
  --shadow-glow: 0 0 0 1px rgba(255, 107, 71, 0.15), 0 20px 50px -20px rgba(255, 107, 71, 0.4);
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Geist', system-ui, sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
em { font-style: italic; }

.instr-italic {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* === BACKGROUND MESH === */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  animation: float 25s ease-in-out infinite;
}
.blob-1 {
  width: 600px; height: 600px;
  top: -200px; left: -200px;
  background: radial-gradient(circle, #FFB199, transparent 70%);
}
.blob-2 {
  width: 700px; height: 700px;
  top: 30%; right: -300px;
  background: radial-gradient(circle, #C7D2FE, transparent 70%);
  animation-delay: -8s;
}
.blob-3 {
  width: 500px; height: 500px;
  bottom: -150px; left: 30%;
  background: radial-gradient(circle, #FCD34D, transparent 70%);
  animation-delay: -16s;
  opacity: 0.3;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.05); }
  66% { transform: translate(-30px, 20px) scale(0.95); }
}

/* === CONTAINER === */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow { max-width: 820px; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
}
.brand-glyph {
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.brand-glyph em {
  font-style: italic;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0 1px;
}
.brand-glyph strong {
  font-weight: 400;
  font-style: italic;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-glyph.big {
  font-size: 56px;
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 32px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
}
.nav-links a { transition: color 0.18s; }
.nav-links a:hover { color: var(--ink); }

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  font-family: 'Geist', sans-serif;
  font-weight: 500;
  font-size: 16px;
  line-height: 1;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-grad);
  opacity: 0;
  transition: opacity 0.18s ease;
}
.btn-primary > * { position: relative; z-index: 1; }
.btn-primary:hover { box-shadow: var(--shadow-glow); }
.btn-primary:hover::before { opacity: 1; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  background: var(--bg-card);
  border-color: var(--ink);
  box-shadow: var(--shadow-md);
}

.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-lg { padding: 18px 32px; font-size: 17px; }
.btn-xl { padding: 22px 36px; font-size: 18px; font-weight: 600; }
.btn-block { width: 100%; }
.btn-arrow { transition: transform 0.18s ease; font-weight: 400; }
.btn:hover .btn-arrow { transform: translateX(3px); }

.play-icon {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--bg);
  border-radius: 50%;
  font-size: 9px;
  padding-left: 2px;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: 140px 0;
  position: relative;
}
.section-tight { padding: 100px 0; }

.section-head {
  margin-bottom: 80px;
  max-width: 800px;
}
.section-head.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.eyebrow {
  display: inline-block;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  background: var(--bg-card);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  margin-bottom: 32px;
}
.eyebrow-light {
  color: rgba(250, 250, 247, 0.7);
  background: rgba(250, 250, 247, 0.08);
  border-color: rgba(250, 250, 247, 0.15);
}

.section-title {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: clamp(40px, 5.5vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--ink);
  max-width: 22ch;
}
.section-title-light { color: var(--bg); }
.section-title em.instr-italic {
  font-weight: 400;
  letter-spacing: -0.025em;
}

.section-lead {
  margin-top: 24px;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
}
.section-lead.center { margin-left: auto; margin-right: auto; }
.lead-light { color: rgba(250, 250, 247, 0.8); }

.hl-grad {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding: 60px 0 100px;
}
.hero-inner {
  max-width: 1100px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--ink-soft);
  box-shadow: var(--shadow-sm);
  margin-bottom: 32px;
}
.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-coral);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-coral);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-headline {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: clamp(44px, 7vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.04em;
  color: var(--ink);
  max-width: 18ch;
  margin: 0 auto;
}
.hero-headline em.instr-italic {
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--ink-soft);
}

.hero-sub {
  margin: 32px auto 0;
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 56ch;
}

.hero-cta {
  margin-top: 48px;
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  margin: 56px auto 0;
  display: inline-flex;
  align-items: center;
  gap: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 20px 36px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-md);
  flex-wrap: wrap;
  justify-content: center;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  text-align: center;
}
.stat-num {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stat-unit {
  font-family: 'Geist Mono', monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-mute);
  margin-left: 2px;
}
.stat-label {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.stat-sep {
  width: 1px;
  height: 36px;
  background: var(--border-strong);
}

/* Hero visual — device mockup */
.hero-visual {
  margin: 100px auto 0;
  max-width: 920px;
  position: relative;
}
.device {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: perspective(1200px) rotateX(2deg);
}
.device-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
}
.device-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--border-strong);
}
.device-dot:nth-child(1) { background: #FF6058; }
.device-dot:nth-child(2) { background: #FFBD30; }
.device-dot:nth-child(3) { background: #28CA42; }
.device-url {
  margin-left: 16px;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
  background: var(--bg);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
}
.device-screen {
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-align: left;
  background: linear-gradient(180deg, var(--bg-card), var(--bg-soft));
}
.chat-bubble {
  padding: 20px 24px;
  border-radius: var(--radius);
  font-size: 16px;
  line-height: 1.5;
  max-width: 80%;
  position: relative;
}
.chat-bubble.user {
  background: var(--ink);
  color: var(--bg);
  align-self: flex-end;
  border-bottom-right-radius: 8px;
}
.chat-bubble.ai {
  background: var(--bg-card);
  border: 1px solid var(--border);
  align-self: flex-start;
  border-bottom-left-radius: 8px;
  max-width: 92%;
  box-shadow: var(--shadow-sm);
}
.bubble-label {
  display: block;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 8px;
}

.book-preview {
  margin-top: 16px;
}
.book-pages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.bp {
  aspect-ratio: 3/4;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.bp-art {
  width: 100%;
  height: 100%;
  background-size: cover;
}
.bp-art-1 { background: linear-gradient(135deg, #FFE4D6, #FFC59A); }
.bp-art-2 { background: linear-gradient(135deg, #D6E5FF, #9AC4FF); }
.bp-art-3 { background: linear-gradient(135deg, #FFDDA8, #FFB35E); }
.bp-art-4 { background: linear-gradient(135deg, #E0D6FF, #B59AFF); }

.book-meta {
  display: flex;
  gap: 14px;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
  flex-wrap: wrap;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.tag {
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--ink-soft);
}

/* ============================================================
   TRUST STRIP
   ============================================================ */
.trust {
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.trust-label {
  text-align: center;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 36px;
}
.trust-items {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink-soft);
}
.trust-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.trust-item strong {
  color: var(--ink);
  font-weight: 600;
}

/* ============================================================
   CARDS-3 (for-whom)
   ============================================================ */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card-portrait {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}
.card-portrait:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}
.portrait-num {
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  font-style: italic;
  font-size: 56px;
  line-height: 1;
  letter-spacing: -0.05em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.card-portrait h3 {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.card-portrait p {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.55;
  flex: 1;
}
.card-tag {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-coral);
  letter-spacing: 0.02em;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ============================================================
   BENTO (features)
   ============================================================ */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: minmax(220px, auto);
  gap: 20px;
}
.bento-cell {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}
.bento-cell:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.bento-hero {
  grid-column: span 2;
  grid-row: span 2;
  padding: 48px;
  background: linear-gradient(140deg, #FFF, #FAF5F2);
}
.bento-rule {
  grid-row: span 2;
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.bento-rule .bento-title { color: var(--bg); }
.bento-rule p { color: rgba(250, 250, 247, 0.75); }

.bento-num {
  width: 48px;
  height: 48px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Geist Mono', monospace;
  font-weight: 600;
  font-size: 16px;
  color: var(--ink-soft);
}
.bento-num.accent {
  background: var(--accent-grad);
  color: var(--bg);
  border-color: transparent;
  font-size: 22px;
}
.bento-rule .bento-num {
  background: rgba(250, 250, 247, 0.08);
  border-color: rgba(250, 250, 247, 0.15);
  color: var(--bg);
}
.bento-title {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.bento-hero .bento-title { font-size: 36px; }
.bento-rule .bento-title { font-size: 32px; }
.bento-cell p {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.55;
}
.bento-sub {
  margin-top: auto;
  font-size: 14px !important;
  color: var(--ink-mute) !important;
  font-style: italic;
}

.formula-block {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 16px 0;
}
.fb-piece {
  display: inline-block;
  padding: 8px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.fb-plus {
  font-family: 'Geist Mono', monospace;
  font-size: 18px;
  color: var(--accent-coral);
  font-weight: 700;
}

/* ============================================================
   STEPS
   ============================================================ */
.steps {
  display: flex;
  gap: 16px;
  align-items: stretch;
}
.step {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}
.step-num {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-coral);
  font-weight: 600;
}
.step h3 {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.step p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.55;
}
.step-arrow {
  display: flex;
  align-items: center;
  font-size: 24px;
  color: var(--ink-mute);
  font-family: 'Geist', sans-serif;
}

/* ============================================================
   DEMO (dark)
   ============================================================ */
.section-dark {
  background: var(--bg-dark);
  color: var(--bg);
  padding: 140px 0;
  overflow: hidden;
  position: relative;
}
.section-dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 800px 400px at 20% 20%, rgba(255, 107, 71, 0.15), transparent 60%),
    radial-gradient(ellipse 600px 400px at 80% 80%, rgba(79, 70, 229, 0.15), transparent 60%);
  pointer-events: none;
}
.section-dark .container { position: relative; z-index: 1; }

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px 24px;
}
.demo-book {
  display: flex;
  flex-direction: column;
  gap: 16px;
  cursor: pointer;
  transition: transform 0.3s ease;
  color: var(--bg);
}
.demo-book:hover { transform: translateY(-6px); }

.demo-cover {
  aspect-ratio: 3/4;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  background: rgba(250, 250, 247, 0.05);
  box-shadow: 0 16px 40px -16px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(250, 250, 247, 0.08);
}
.demo-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.demo-book:hover .demo-cover img { transform: scale(1.04); }

.demo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 10, 31, 0) 50%, rgba(10, 10, 31, 0.85) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 24px;
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.3s ease;
  color: var(--bg);
}
.demo-book:hover .demo-overlay { opacity: 1; }

.demo-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.demo-genre {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-coral);
  font-weight: 600;
}
.demo-name {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: 18px;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--bg);
}
.demo-meta {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: rgba(250, 250, 247, 0.5);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.demo-meta .dot { opacity: 0.5; }

.demo-author {
  margin-top: 56px;
  text-align: center;
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 22px;
  color: rgba(250, 250, 247, 0.85);
  line-height: 1.5;
}
.demo-author strong {
  font-weight: 400;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.demo-author .caveat-mark {
  font-family: 'Geist Mono', monospace;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.55);
  margin-right: 6px;
}
.demo-author-note {
  display: block;
  margin-top: 6px;
  font-size: 18px;
  color: rgba(250, 250, 247, 0.7);
}

/* ============================================================
   COMPARISON
   ============================================================ */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 60px;
}
.compare-col {
  border-radius: var(--radius);
  padding: 40px;
}
.col-bad {
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.col-good {
  background: var(--ink);
  color: var(--bg);
  position: relative;
  overflow: hidden;
}
.col-good::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(255, 107, 71, 0.18), transparent 60%);
  pointer-events: none;
}
.col-good > * { position: relative; z-index: 1; }

.compare-head { margin-bottom: 28px; }
.compare-tag {
  display: inline-block;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 12px;
}
.compare-tag.accent {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.compare-head h3 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
}
.compare-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.compare-col li {
  font-size: 16px;
  line-height: 1.5;
  padding-left: 28px;
  position: relative;
}
.col-bad li::before {
  content: '×';
  position: absolute;
  left: 0;
  top: -1px;
  width: 18px;
  height: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-mute);
}
.col-good li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: -1px;
  width: 18px;
  height: 18px;
  background: var(--accent-grad);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg);
}
.col-good li strong { color: var(--bg); font-weight: 600; }
.col-good li { color: rgba(250, 250, 247, 0.85); }

/* ============================================================
   RULE BANNER
   ============================================================ */
.section-rule {
  padding: 80px 0;
}
.rule-card {
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--radius-lg);
  padding: 80px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.rule-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 30%, rgba(255, 107, 71, 0.2), transparent 60%),
    radial-gradient(ellipse at 70% 70%, rgba(79, 70, 229, 0.15), transparent 60%);
}
.rule-card > * { position: relative; z-index: 1; }
.rule-label {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent-coral);
  margin-bottom: 28px;
  display: inline-block;
}
.rule-text {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.1;
  letter-spacing: -0.035em;
}
.rule-sub {
  margin-top: 36px;
  font-size: 19px;
  line-height: 1.55;
  color: rgba(250, 250, 247, 0.75);
  max-width: 56ch;
  margin-left: auto;
  margin-right: auto;
}
.rule-sub strong { color: var(--bg); font-weight: 600; }

/* ============================================================
   PRICE
   ============================================================ */
.price-card {
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 56px;
  position: relative;
  box-shadow: var(--shadow-lg);
}
.price-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: var(--accent-grad);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.4;
}
.price-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  z-index: -1;
}

.price-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-grad);
  color: var(--bg);
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: var(--shadow-md);
}

.price-main {
  text-align: center;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}
.price-big {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.price-amount {
  font-family: 'Geist', sans-serif;
  font-weight: 700;
  font-size: clamp(72px, 10vw, 120px);
  line-height: 1;
  letter-spacing: -0.05em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.price-cur {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 36px;
  color: var(--ink);
}
.price-detail {
  font-size: 16px;
  color: var(--ink-soft);
}
.price-detail .dot { color: var(--ink-mute); margin: 0 4px; }

.price-includes { margin-bottom: 32px; }
.price-incl-label {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 16px;
}
.price-includes ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 24px;
}
.price-includes li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--ink-soft);
}
.check {
  width: 20px;
  height: 20px;
  background: var(--accent-grad);
  color: var(--bg);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}

.price-cta { text-align: center; }
.price-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.5;
}
.price-note strong {
  color: var(--ink);
  font-weight: 600;
}

/* ============================================================
   ABOUT TEACHER
   ============================================================ */
.section-about {
  padding: 140px 0;
}
.about-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 80px;
  align-items: start;
}

.about-visual { position: sticky; top: 100px; }
.photo-frame {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.photo-placeholder-art {
  aspect-ratio: 1 / 1;
  position: relative;
  background: var(--bg-dark);
  overflow: hidden;
}
.photo-placeholder-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
  transition: transform 0.6s ease;
}
.photo-frame:hover .photo-placeholder-art img {
  transform: scale(1.03);
}
.photo-placeholder-art svg { width: 100%; height: 100%; }
.photo-info {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--border);
}
.photo-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
.photo-role {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-mute);
}

.about-h2 {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: clamp(36px, 4.5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  color: var(--ink);
  margin-bottom: 48px;
}

.about-creds {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 48px;
}
.cred {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}
.cred-mark {
  font-family: 'Instrument Serif', serif;
  font-size: 28px;
  line-height: 1;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  flex-shrink: 0;
}
.cred strong {
  display: block;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}
.cred p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.about-letter {
  background: linear-gradient(140deg, var(--bg-card), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.about-letter::before {
  content: '"';
  position: absolute;
  top: 16px;
  left: 32px;
  font-family: 'Instrument Serif', serif;
  font-size: 100px;
  line-height: 1;
  color: var(--accent-coral);
  opacity: 0.3;
}
.about-letter p {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 22px;
  line-height: 1.5;
  color: var(--ink);
  position: relative;
  z-index: 1;
}
.about-letter footer {
  margin-top: 20px;
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink-mute);
}

/* ============================================================
   TESTIMONIALS PLACEHOLDER
   ============================================================ */
.section-testimonials {
  background: var(--bg-soft);
}
.testimonial-placeholder {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}
.tp-card {
  background: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 36px 32px;
  text-align: center;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}
.tp-quote {
  font-family: 'Instrument Serif', serif;
  font-size: 48px;
  line-height: 1;
  color: var(--ink-faint);
}
.tp-card p {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq {
  margin-top: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-item:last-child { border-bottom: none; }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 28px 32px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  position: relative;
  padding-right: 60px;
  transition: color 0.18s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 32px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background: var(--bg-soft);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
  color: var(--ink-soft);
  transition: all 0.3s;
}
.faq-item[open] summary { color: var(--accent-coral); }
.faq-item[open] summary::after {
  content: '−';
  background: var(--accent-grad);
  color: var(--bg);
  transform: translateY(-50%) rotate(180deg);
}
.faq-item p {
  padding: 0 32px 28px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.65;
  max-width: 62ch;
}

/* ============================================================
   FINAL CTA
   ============================================================ */
.section-cta {
  padding: 120px 0;
}
.cta-card {
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  padding: 72px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.cta-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 0% 0%, rgba(255, 107, 71, 0.15), transparent 60%),
    radial-gradient(ellipse 500px 400px at 100% 100%, rgba(79, 70, 229, 0.15), transparent 60%);
}
.cta-card > * { position: relative; z-index: 1; }

.cta-h2 {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: clamp(36px, 4.5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin: 28px 0;
}
.cta-sub {
  font-size: 18px;
  line-height: 1.55;
  color: rgba(250, 250, 247, 0.8);
  margin-bottom: 40px;
}

.direct-msgs {
  padding-top: 32px;
  border-top: 1px solid rgba(250, 250, 247, 0.15);
}
.direct-label {
  display: block;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.6);
  margin-bottom: 16px;
}
.direct-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.msg-btn {
  background: rgba(250, 250, 247, 0.08);
  border: 1px solid rgba(250, 250, 247, 0.15);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.2s;
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.msg-btn:hover {
  background: rgba(255, 107, 71, 0.15);
  border-color: var(--accent-coral);
}
.msg-icon { font-size: 18px; opacity: 0.7; }
.direct-phone {
  display: inline-block;
  font-family: 'Geist Mono', monospace;
  font-size: 16px;
  color: var(--accent-coral);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.cta-form {
  background: var(--bg);
  color: var(--ink);
  padding: 40px;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: var(--shadow-lg);
}
.form-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.field input, .field select {
  font-family: 'Geist', sans-serif;
  font-size: 16px;
  padding: 14px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--ink);
  transition: all 0.18s ease;
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--accent-coral);
  background: var(--bg-card);
  box-shadow: 0 0 0 3px rgba(255, 107, 71, 0.12);
}
.field input::placeholder {
  color: var(--ink-faint);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 100px;
  gap: 14px;
}
.form-tos {
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.5;
  margin-top: 4px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-soft);
  padding: 80px 0 32px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid var(--border);
}
.footer-brand p {
  margin-top: 20px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 40ch;
  line-height: 1.6;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-h {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 8px;
}
.footer-col a, .footer-col span { font-size: 15px; color: var(--ink-soft); }
.footer-col a {
  color: var(--ink);
  transition: color 0.18s;
}
.footer-col a:hover { color: var(--accent-coral); }
.footer-small {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--ink-mute);
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--ink-mute);
  gap: 20px;
  flex-wrap: wrap;
}
.footer-handmade {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--ink-soft);
}

/* ============================================================
   STICKY MOBILE CTA
   ============================================================ */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 16px;
  left: 16px;
  right: 16px;
  z-index: 50;
  padding: 18px 28px;
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 17px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .section { padding: 100px 0; }
  .section-tight { padding: 80px 0; }
  .cards-3, .bento, .trust-items, .testimonial-placeholder { grid-template-columns: repeat(2, 1fr); }
  .demo-grid { grid-template-columns: repeat(2, 1fr); }
  .bento-hero, .bento-rule { grid-column: span 2; grid-row: auto; }
  .compare { grid-template-columns: 1fr; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); align-self: center; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { position: static; max-width: 360px; margin: 0 auto; }
  .cta-card { grid-template-columns: 1fr; padding: 48px; gap: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-inner { padding: 12px 20px; }
  .section { padding: 80px 0; }
  .hero { padding: 40px 0 60px; }
  .hero-stats {
    padding: 18px 24px;
    gap: 16px;
  }
  .stat-sep { display: none; }
  .device-screen { padding: 20px; }
  .chat-bubble { padding: 14px 16px; font-size: 14px; max-width: 95%; }
  .book-pages { gap: 6px; }
  .trust-items, .cards-3, .bento, .testimonial-placeholder { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; gap: 32px; }
  .demo-author { margin-top: 32px; font-size: 18px; }
  .bento-hero, .bento-rule { grid-column: auto; }
  .price-card { padding: 36px 24px; }
  .price-includes ul { grid-template-columns: 1fr; }
  .rule-card { padding: 48px 24px; }
  .cta-card { padding: 32px; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .sticky-mobile-cta { display: flex; }
  body { padding-bottom: 80px; }
}