:root {
  --bg: #080808;
  --surface: #111111;
  --surface-2: #1a1a1a;
  --accent: #F5FF00;
  --accent-dim: #b8bf00;
  --text: #f0f0f0;
  --text-dim: #888888;
  --border: #222222;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 48px 100px;
}
.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 28px;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 440px;
  line-height: 1.7;
}

/* phone mockup */
.phone-frame {
  width: 280px;
  background: var(--surface);
  border-radius: 28px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 40px 80px rgba(0,0,0,0.8), 0 0 40px rgba(245,255,0,0.05);
  margin-left: auto;
}
.phone-topbar {
  background: var(--surface-2);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.phone-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent);
}
.phone-dots { display: flex; gap: 5px; }
.phone-dots span {
  width: 5px; height: 5px; border-radius: 50%; background: var(--text-dim);
}
.chat-feed { padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.msg-ai { display: flex; gap: 8px; align-items: flex-start; }
.msg-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #000;
  font-family: var(--font-display);
  font-weight: 800; font-size: 0.7rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.msg-bubble {
  background: var(--surface-2);
  border-radius: 0 14px 14px 14px;
  padding: 10px 13px;
  max-width: 220px;
}
.msg-bubble p {
  font-size: 0.72rem; line-height: 1.5; color: var(--text-dim);
}
.msg-bubble strong { color: var(--accent); font-weight: 600; }
.msg-visual { padding-left: 34px; }
.visual-placeholder {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}
.visual-inner { border: 1px dashed rgba(245,255,0,0.3); border-radius: 6px; padding: 10px 8px; }
.visual-label {
  display: block; font-size: 0.55rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 4px;
}
.visual-inner p { font-size: 0.65rem; color: var(--text-dim); line-height: 1.4; }
.msg-choice-group { display: flex; flex-direction: column; gap: 6px; padding-left: 34px; }
.choice-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  display: flex; align-items: flex-start; gap: 8px;
}
.choice-letter {
  font-family: var(--font-display);
  font-weight: 800; font-size: 0.7rem;
  color: var(--accent);
  flex-shrink: 0; margin-top: 1px;
}
.choice-card p { font-size: 0.68rem; color: var(--text); line-height: 1.4; }

/* ── MECHANICS ── */
.mechanics { padding: 100px 48px; background: var(--bg); }
.mechanics-inner { max-width: 1280px; margin: 0 auto; }
.section-heading {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 56px;
}
.mech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}
.mech-card {
  background: var(--surface);
  padding: 36px 28px;
  transition: background 0.2s;
}
.mech-card:hover { background: var(--surface-2); }
.mech-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--border);
  margin-bottom: 20px;
}
.mech-card:hover .mech-number { color: var(--accent-dim); }
.mech-content h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.mech-content p { font-size: 0.875rem; color: var(--text-dim); line-height: 1.65; }

/* ── VISION ── */
.vision { padding: 100px 48px; background: var(--surface); }
.vision-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: 80px;
  align-items: start;
}
.vision-text h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}
.vision-text p {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.75;
  max-width: 600px;
  margin-bottom: 16px;
}
.vision-stat {
  border-left: 2px solid var(--accent);
  padding-left: 20px;
  margin-bottom: 40px;
}
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 0.8rem; color: var(--text-dim); line-height: 1.5; }

/* ── CLOSING ── */
.closing {
  padding: 120px 48px;
  background: var(--bg);
  text-align: center;
}
.closing-statement {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 900px;
  margin: 0 auto;
  color: var(--text);
}

/* ── FOOTER ── */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 32px 48px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.9rem;
  display: block;
  color: var(--text);
}
.footer-desc { font-size: 0.8rem; color: var(--text-dim); margin-top: 4px; display: block; }
.footer-links a {
  font-size: 0.8rem; color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 80px 24px 60px; }
  .phone-frame { margin: 0 auto; }
  .hero-headline { font-size: 3rem; }
  .mech-grid { grid-template-columns: 1fr 1fr; }
  .vision-inner { grid-template-columns: 1fr; gap: 48px; }
  .vision-aside { display: flex; gap: 40px; }
}
@media (max-width: 600px) {
  .hero { padding: 60px 20px 40px; }
  .mechanics, .vision, .closing { padding: 60px 20px; }
  .mech-grid { grid-template-columns: 1fr; }
  .vision-aside { flex-direction: column; }
  .footer-inner { flex-direction: column; gap: 16px; align-items: flex-start; }
  .phone-frame { width: 240px; }
}