:root {
  color-scheme: light;
  font-family: "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1d1d1f;
  background: #ffffff;
  line-height: 1.5;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background: #ffffff;
}

.page-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.global-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0 24px;
  border-bottom: 1px solid #e0e0e0;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 9999px;
  background: #0066cc;
  color: #ffffff;
  font-size: 20px;
  font-weight: 700;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
  font-weight: 600;
  color: #7a7a7a;
}

.brand-subtitle {
  margin: 2px 0 0;
  font-size: 13px;
  color: #333333;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  color: #1d1d1f;
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12px;
}

.hero-tile {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  padding: 64px 0 72px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-copy h1 {
  margin: 12px 0 18px;
  font-size: clamp(3rem, 5vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.5px;
  font-weight: 600;
  max-width: 10ch;
}

.hero-subtitle {
  max-width: 560px;
  margin: 0;
  font-size: 1.15rem;
  color: #333333;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button-primary,
.button-secondary {
  border: none;
  cursor: pointer;
  border-radius: 9999px;
  padding: 14px 26px;
  font-size: 1rem;
  font-weight: 600;
}

.button-primary {
  color: #ffffff;
  background: #0066cc;
}

.button-secondary {
  color: #0066cc;
  background: #ffffff;
  border: 1px solid #0066cc;
}

.hero-surface {
  display: flex;
  align-items: center;
}

.live-card {
  width: 100%;
  padding: 34px;
  background: #f5f5f7;
  border-radius: 18px;
  border: 1px solid #e0e0e0;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.card-header span:first-child {
  font-size: 0.95rem;
  font-weight: 700;
}

.chip {
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: 9999px;
  background: #ffffff;
  color: #1d1d1f;
  border: 1px solid #d2d2d7;
}

.card-copy {
  margin: 0;
  font-size: 1rem;
  color: #333333;
}

.dark-tile {
  margin-top: 120px;
  padding: 56px 64px;
  background: #1d1d1f;
  color: #ffffff;
  border-radius: 32px;
}

.section-headline h2,
.section-copy h2 {
  margin: 0 0 14px;
  font-size: 2.2rem;
  font-weight: 600;
  letter-spacing: -0.6px;
}

.section-headline p,
.section-copy p {
  margin: 0;
  font-size: 1rem;
  color: #d1d1d6;
  max-width: 680px;
}

.thread-shell {
  display: grid;
  gap: 24px;
  margin-top: 36px;
}

.thread-controls {
  display: grid;
  gap: 16px;
}

.thread-controls label {
  display: grid;
  gap: 10px;
  font-size: 0.95rem;
  color: #bebec1;
}

.thread-controls input {
  width: 100%;
  border: none;
  border-radius: 18px;
  padding: 16px 18px;
  font-size: 1rem;
  background: #242427;
  color: #ffffff;
}

.thread-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.thread-feed {
  min-height: 320px;
  padding: 28px;
  background: #111113;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.message-row {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.message-row:last-child {
  margin-bottom: 0;
}

.message-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.message-author {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

.message-text {
  white-space: pre-wrap;
  font-size: 1rem;
  line-height: 1.75;
  color: #d1d1d5;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 18px;
  padding: 20px;
}

.empty-state {
  color: #7a7a7f;
  font-size: 1rem;
  padding: 48px;
  text-align: center;
  background: rgba(255,255,255,0.04);
  border-radius: 18px;
}

.light-tile {
  margin-top: 100px;
  padding: 64px 0;
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.persona-card {
  padding: 28px;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid #e0e0e0;
}

.persona-name {
  margin: 0 0 12px;
  font-size: 1.15rem;
  font-weight: 600;
}

.persona-note {
  margin: 0;
  font-size: 0.98rem;
  color: #4a4a4c;
}

.footer-tile {
  margin-top: 120px;
  padding: 48px 52px;
  border-radius: 28px;
  background: #f5f5f7;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 32px;
  align-items: center;
}

.footer-tile h2 {
  margin: 0 0 14px;
  font-size: 2rem;
  color: #1d1d1f;
}

.footer-tile p {
  margin: 0;
  color: #4a4a4c;
  font-size: 1rem;
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-links a {
  color: #0066cc;
  text-decoration: none;
  font-weight: 600;
}

@media (max-width: 960px) {
  .hero-tile,
  .footer-tile {
    grid-template-columns: 1fr;
  }

  .page-shell {
    padding-left: 18px;
    padding-right: 18px;
  }
}

@media (max-width: 720px) {
  .global-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .thread-actions,
  .hero-actions {
    width: 100%;
  }

  .thread-actions button,
  .hero-actions button {
    width: 100%;
  }

  .persona-grid {
    grid-template-columns: 1fr;
  }
}