/* =============================================
   Mosaic — Global Styles
   ============================================= */

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

:root {
  --bg:         #0a0e1a;
  --bg-card:    #111827;
  --bg-warm:    #0f1420;
  --border:     #1e2d40;
  --accent:     #00c6ff;
  --accent-dim: rgba(0, 198, 255, 0.12);
  --accent-bdr: rgba(0, 198, 255, 0.2);
  --text:       #ffffff;
  --text-sec:   #9aa3b8;
  --text-dim:   #6b7a99;
  --font:       -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
}
.container--wide { max-width: 1000px; }

section { padding: 80px 0; }
section + section { border-top: 1px solid var(--border); }

/* ── Nav ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 14px;
  color: var(--text-sec);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: opacity 0.2s, transform 0.15s;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn--primary { background: var(--accent); color: #000000; font-weight: 800; }
.btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-sec);
}
.btn--lg { padding: 16px 32px; font-size: 16px; border-radius: 12px; }

/* ── Labels ── */
.label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}

/* ── Typography ── */
h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
h2 {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
p { color: var(--text-sec); line-height: 1.75; margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

/* ── Hero ── */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  border-top: none !important;
}
.hero h1 { max-width: 720px; margin: 0 auto 20px; }
.hero .subhead {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-sec);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.hero-three-q {
  font-size: clamp(14px, 2vw, 17px);
  color: var(--text-dim);
  font-style: italic;
  max-width: 480px;
  margin: 0 auto 36px;
  line-height: 2;
}
.hero-three-q em {
  font-style: normal;
  color: var(--text-sec);
}

/* ── Story ── */
.story { background: var(--bg-warm); }
.story-inner { max-width: 640px; }
.story p { font-size: 17px; line-height: 1.8; }
.story .questions {
  margin: 28px 0;
  padding: 24px 28px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-bdr);
  border-radius: 14px;
}
.story .questions p {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.5;
}
.story .questions p:last-child { margin-bottom: 0; }
.story .sign { margin-top: 28px; color: var(--text-dim); font-size: 14px; }

/* ── Problem ── */
.problem-text { max-width: 640px; }
.problem-text p { font-size: 17px; line-height: 1.8; }

/* ── Three Answers ── */
.answers-grid { display: flex; flex-direction: column; gap: 2px; margin-top: 48px; }
.answer-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 36px;
  display: flex;
  gap: 28px;
  align-items: flex-start;
}
.answer-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
  padding-top: 4px;
  flex-shrink: 0;
  width: 28px;
}
.answer-body h3 { margin-bottom: 12px; font-size: 22px; }
.answer-body p { font-size: 15px; }

/* ── How It Works ── */
.steps { display: flex; flex-direction: column; gap: 0; margin-top: 48px; }
.step {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid var(--accent-bdr);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}
.step-body h3 { font-size: 18px; margin-bottom: 8px; }
.step-body p { font-size: 15px; }

/* ── CTA Section ── */
.cta-section { text-align: center; }
.cta-section h2 { max-width: 560px; margin: 0 auto 16px; }
.cta-section > .container > p {
  max-width: 480px;
  margin: 0 auto 36px;
  font-size: 16px;
}

/* ── Email Form ── */
.email-form {
  display: flex;
  gap: 10px;
  max-width: 440px;
  margin: 0 auto 16px;
}
.email-form input[type="email"] {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 15px;
  color: var(--text);
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}
.email-form input[type="email"]:focus { border-color: var(--accent); }
.email-form input[type="email"]::placeholder { color: var(--text-dim); }
.form-note { font-size: 12px; color: var(--text-dim); text-align: center; }
.form-success {
  display: none;
  color: var(--accent);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  margin-top: 12px;
}

/* ── Footer ── */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
footer p { font-size: 13px; color: var(--text-dim); margin: 0; }
footer a { color: var(--text-dim); text-decoration: none; }
footer a:hover { color: var(--text-sec); }

/* ── Science page cards ── */
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 36px;
  margin-bottom: 20px;
}
.metric-card h3 { font-size: 22px; margin-bottom: 6px; }
.metric-card .metric-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-bdr);
  border-radius: 6px;
  padding: 3px 8px;
  margin-bottom: 16px;
}
.metric-card .not-advice {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-dim);
  font-style: italic;
}
.metric-viz { margin: 24px 0; }

/* ── Privacy page ── */
.prose h2 { font-size: 22px; margin: 36px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose ul {
  margin: 12px 0 16px 20px;
  color: var(--text-sec);
  line-height: 1.75;
}
.prose ul li { margin-bottom: 6px; }
.prose a { color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .nav-links a:not(.btn) { display: none; }
  .nav-links .btn { padding: 8px 14px !important; font-size: 13px !important; border-radius: 8px; }
  section { padding: 60px 0; }
  .hero { padding: 120px 0 72px; }
  .answer-card { flex-direction: column; gap: 12px; padding: 24px 20px; }
  .email-form { flex-direction: column; }
  .nav-links .btn--ghost { display: none; }
}

/* ── Hamburger Menu ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 36px;
  height: 36px;
}
.nav-hamburger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.25s;
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile-menu {
  display: none;
  flex-direction: column;
  background: #111827;
  border-top: 1px solid #1e2d40;
  padding: 12px 0 16px;
}
.nav-mobile-menu a {
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 500;
  color: #9aa3b8;
  text-decoration: none;
  border-bottom: 1px solid #1a2335;
  transition: color 0.2s, background 0.2s;
}
.nav-mobile-menu a:last-child { border-bottom: none; }
.nav-mobile-menu a:hover { color: #fff; background: rgba(255,255,255,0.04); }
.nav-mobile-menu.open { display: flex; }

@media (max-width: 640px) {
  .nav-hamburger { display: flex; }
  .nav-links a:not(.btn) { display: none; }
  .nav-links .btn { display: none; }
}