/* Think — thinkapp.tech
   Same design language as the app:
   near-black canvas, dark rounded cards, yellow accent,
   serif for quotes and display type, sans for UI. */

:root {
  --bg: #0a0a0b;
  --bg-raised: #141416;
  --card: #17171a;
  --card-border: #232327;
  --text: #f5f5f4;
  --text-dim: #9a9a98;
  --text-faint: #6b6b6a;
  --yellow: #ffe45c;
  --yellow-deep: #aa9516;
  --radius: 28px;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: ui-serif, "New York", "Iowan Old Style", Georgia, "Times New Roman", serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ---------- Type ---------- */

h1, h2 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.12;
  text-wrap: balance;
}

h1 { font-size: clamp(2.6rem, 6.5vw, 4.6rem); }
h2 { font-size: clamp(2rem, 4.5vw, 3.1rem); }

h1 em { font-style: italic; color: var(--yellow); }

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.lede {
  font-size: 1.2rem;
  color: var(--text-dim);
  max-width: 34em;
  margin-top: 1.25rem;
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1.25rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
}

.brand img { border-radius: 8px; }

.nav nav { display: flex; gap: 1.75rem; }

.nav nav a {
  font-size: 0.95rem;
  color: var(--text-dim);
  transition: color 0.2s;
}

.nav nav a:hover { color: var(--text); }

/* ---------- CTA ---------- */

.cta {
  display: inline-block;
  background: var(--yellow);
  color: #0a0a0b;
  font-weight: 600;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 30px rgba(255, 228, 92, 0.25);
}

.cta-small { padding: 0.55rem 1.1rem; font-size: 0.9rem; }

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(4rem, 9vh, 7rem) clamp(1.25rem, 4vw, 3rem) 3rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: 2.25rem;
}

.hero-note { color: var(--text-faint); font-size: 0.9rem; }

/* ---------- Phone frame ---------- */

.phone {
  width: min(320px, 78vw);
  margin: 0 auto;
  padding: 12px;
  background: #1c1c1f;
  border: 1px solid #2c2c30;
  border-radius: 52px;
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.65),
    0 0 120px rgba(255, 228, 92, 0.06);
}

.phone img { border-radius: 40px; }

.phone-tilt-left  { transform: rotate(-2.5deg); }
.phone-tilt-right { transform: rotate(2.5deg); }

/* ---------- Quote band ---------- */

.quote-band {
  padding: clamp(3rem, 8vh, 6rem) clamp(1.25rem, 4vw, 3rem);
  background:
    radial-gradient(ellipse 70% 90% at 50% 0%, rgba(255, 228, 92, 0.05), transparent),
    var(--bg-raised);
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
}

.quote-card {
  max-width: 780px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: clamp(2rem, 5vw, 3.5rem);
}

.tick {
  display: block;
  width: 64px;
  height: 6px;
  border-radius: 3px;
  background: var(--yellow);
  margin-bottom: 1.75rem;
}

.quote-card blockquote {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.35;
  text-wrap: balance;
}

.quote-card figcaption {
  margin-top: 1.5rem;
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---------- Sections ---------- */

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(4rem, 10vh, 7rem) clamp(1.25rem, 4vw, 3rem);
}

/* ---------- Loop ---------- */

.loop {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 3rem;
}

.loop li {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.loop-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: rgba(255, 228, 92, 0.12);
  color: var(--yellow);
  font-family: var(--serif);
  font-size: 1.05rem;
  margin-bottom: 1.1rem;
}

.loop p { color: var(--text-dim); font-size: 0.95rem; margin-top: 0.5rem; }

/* ---------- Split sections ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
}

.split-flip .split-copy { order: 2; }
.split-flip .split-phone { order: 1; }

.split-copy p:not(.eyebrow) {
  color: var(--text-dim);
  margin-top: 1.25rem;
  max-width: 30em;
}

.split-copy strong { color: var(--text); font-weight: 600; }

/* ---------- Feature grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 3rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.25s;
}

.card:hover { border-color: rgba(255, 228, 92, 0.35); }

.card p { color: var(--text-dim); font-size: 0.95rem; margin-top: 0.5rem; }

/* ---------- Privacy ---------- */

.privacy {
  text-align: center;
}

.privacy-inner {
  background:
    radial-gradient(ellipse 60% 100% at 50% 100%, rgba(255, 228, 92, 0.06), transparent),
    var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: clamp(3rem, 7vw, 5rem) clamp(1.5rem, 5vw, 4rem);
}

.privacy p:not(.eyebrow) {
  color: var(--text-dim);
  max-width: 34em;
  margin: 1.25rem auto 0;
}

/* ---------- Final CTA ---------- */

.final { text-align: center; }

.final .lede { margin-left: auto; margin-right: auto; }

.final .cta { margin-top: 2rem; }

.final-icon {
  margin: 0 auto 1.75rem;
  border-radius: 20px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--card-border);
  padding: 2.5rem clamp(1.25rem, 4vw, 3rem) 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--serif);
  font-weight: 600;
}

.footer-brand img { border-radius: 6px; }

.footer nav { display: flex; gap: 1.5rem; }

.footer nav a { color: var(--text-dim); font-size: 0.9rem; }

.footer nav a:hover { color: var(--text); }

.footer p { color: var(--text-faint); font-size: 0.85rem; }

/* ---------- Prose pages (privacy, support) ---------- */

.prose {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5rem) clamp(1.25rem, 4vw, 3rem) clamp(4rem, 10vh, 6rem);
}

.prose h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.12;
  margin-bottom: 1.5rem;
}

.prose h2 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  margin: 2.5rem 0 0.75rem;
}

.prose h3 {
  font-size: 1.05rem;
  margin: 1.75rem 0 0.4rem;
  color: var(--text);
}

.prose p, .prose li {
  color: var(--text-dim);
}

.prose strong { color: var(--text); font-weight: 600; }

.prose a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 228, 92, 0.4);
}

.prose a:hover { text-decoration-color: var(--yellow); }

.prose ul {
  margin: 0.75rem 0 1rem;
  padding-left: 1.4rem;
}

.prose li { margin-bottom: 0.6rem; }

.prose li::marker { color: var(--yellow); }

.prose p + p { margin-top: 1rem; }

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .loop { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav nav { display: none; }

  .hero,
  .split {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-actions { justify-content: center; }

  .split-flip .split-copy { order: 1; }
  .split-flip .split-phone { order: 2; }

  .split-copy p:not(.eyebrow) { margin-left: auto; margin-right: auto; }

  .phone-tilt-left,
  .phone-tilt-right { transform: none; }
}

@media (max-width: 520px) {
  .loop, .grid { grid-template-columns: 1fr; }
}