:root {
  --text: rgba(255, 255, 255, 0.96);
  --muted: rgba(255, 255, 255, 0.7);
  --btn-bg: rgba(0, 0, 0, 0.35);
  --btn-border: rgba(255, 255, 255, 0.45);
  --btn-hover: rgba(0, 0, 0, 0.55);
  --bg: #fafaf8;
  --fg: #1a1a1a;
  --surface: #fff;
  --surface2: #f4f4f0;
  --border: #e8e8e4;
  --orange: #ff6b2c;
  --orange-light: #fff4ef;
  --green: #10b981;
  --blue: #3b82f6;
  --gray: #8a8a85;
  --dim: #b5b5b0;
  --mono: "JetBrains Mono", monospace;
  --sans: "Space Grotesk", -apple-system, system-ui, sans-serif;
  --r: 10px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ===== NAV (aligned with whats-new / site) ===== */
.hero-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.04);
}

.hero-nav .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fg);
}

.hero-nav .brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.hero-nav .brand span {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1;
  justify-content: flex-end;
}

.nav-links > a {
  font-size: 12px;
  color: var(--gray);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

.nav-links > a:hover {
  color: var(--fg);
}

.nav-links > a.nav-active {
  color: var(--orange);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--gray);
  border-radius: 2px;
}

.mobile-panel {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  height: 100vh;
  background: var(--surface);
  z-index: 999;
  padding: 70px 24px 24px;
  transition: right 0.3s ease;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
  overflow-y: auto;
}

.mobile-panel.open {
  right: 0;
}

.mobile-panel a {
  display: block;
  padding: 12px 0;
  font-size: 14px;
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 998;
  display: none;
}

.mobile-overlay.show {
  display: block;
}

/* ===== PAGE HERO ===== */
.page-hero {
  padding: 120px 28px 40px;
  text-align: center;
  background: var(--surface2);
  position: relative;
  border-bottom: 1px solid var(--border);
}

.page-hero .kicker {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.page-hero h1 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 10px;
  line-height: 1.15;
}

.page-hero .subtitle {
  font-size: 15px;
  color: var(--gray);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ===== MAIN + CARD ===== */
.shell-page {
  padding: 48px 28px 80px;
}

.shell-page .inner {
  max-width: 800px;
  margin: 0 auto;
}

.chat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.35s, box-shadow 0.35s;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
}

.chat-card:hover {
  border-color: rgba(255, 107, 44, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.header {
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border);
}

.header .title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.2px;
  margin: 0;
}

.header .subtitle {
  margin: 6px 0 0;
  color: var(--gray);
  font-size: 13px;
}

.messages {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.meta {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.3px;
  color: var(--gray);
  text-transform: uppercase;
}

.bubble {
  max-width: 85%;
  border-radius: 14px;
  padding: 14px 16px;
  line-height: 1.65;
  font-size: 14px;
  white-space: pre-wrap;
}

.user {
  align-items: flex-end;
}

.user .bubble {
  background: var(--orange);
  color: #fff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 16px rgba(255, 107, 44, 0.25);
}

.shell {
  align-items: flex-start;
}

.shell .bubble {
  background: var(--surface2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.footer {
  padding: 16px 28px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.lang-link {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--orange);
  text-decoration: none;
  letter-spacing: 0.3px;
}

.lang-link:hover {
  text-decoration: underline;
}

.note {
  color: var(--gray);
  font-size: 12px;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--fg);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 28px;
  text-align: center;
}

.site-footer p {
  font-family: var(--mono);
  font-size: 10px;
  color: rgba(255, 255, 255, 0.2);
  letter-spacing: 0.5px;
}

.site-footer a {
  color: var(--orange);
  text-decoration: none;
}

@media (max-width: 640px) {
  .hero-nav {
    padding: 10px 16px;
  }

  .hero-nav .brand span {
    display: none;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .page-hero {
    padding: 100px 16px 32px;
  }

  .shell-page {
    padding: 32px 16px 60px;
  }

  .messages {
    padding: 20px 16px;
  }

  .bubble {
    max-width: 92%;
  }
}