:root {
  color-scheme: dark;
  --bg: #0a0c10;
  --panel: #15181f;
  --panel-strong: #1d212a;
  --text: #f1f2f4;
  --muted: #a1a6af;
  --accent: #d6402c;
  --accent-glow: rgba(214, 64, 44, 0.35);
  --border: #2a2f38;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --radius: 14px;
  --space-xxl: 5rem;
  --space-xl: 3rem;
  --space-lg: 2rem;
  --space-md: 1.25rem;
  --space-sm: 0.75rem;
  --space-xs: 0.45rem;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 12%, rgba(214, 64, 44, 0.14), transparent 26%),
    radial-gradient(circle at 80% 10%, rgba(214, 64, 44, 0.08), transparent 28%),
    linear-gradient(135deg, #05070a, #0b0e14 35%, #0e121a 65%, #0b0f16);
  color: var(--text);
  font-family: "Segoe UI", "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    Arial, sans-serif;
  line-height: 1.6;
  letter-spacing: 0.015em;
}

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

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.top-bar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  background: rgba(10, 12, 16, 0.92);
  border-bottom: 1px solid var(--border);
  z-index: 10;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  text-shadow: 0 0 18px var(--accent-glow);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color 160ms ease, text-shadow 160ms ease;
}

.nav-links a:focus-visible,
.nav-links a:hover {
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent-glow);
}

main {
  padding: var(--space-xxl) 0 var(--space-xl);
}

.hero {
  padding: var(--space-xl);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(120deg, #15181f, #11141b);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at 40% 30%, var(--accent-glow), transparent 30%);
  opacity: 0.65;
  filter: blur(32px);
  pointer-events: none;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--muted);
  font-size: 0.78rem;
  margin: 0 0 var(--space-sm);
}

h1 {
  font-size: clamp(3rem, 5vw, 3.8rem);
  letter-spacing: 0.02em;
  margin: 0 0 var(--space-sm);
  text-transform: uppercase;
  text-shadow: 0 0 22px var(--accent-glow);
}

.subtitle {
  margin: 0 0 var(--space-md);
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.lede {
  margin: 0 0 var(--space-lg);
  max-width: 720px;
  color: var(--muted);
  font-size: 1.05rem;
}

.tagline {
  margin: 0;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
}

.chatlog {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  background: linear-gradient(145deg, var(--panel), var(--panel-strong));
  box-shadow: var(--shadow);
  min-height: 200px;
  max-height: 70vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.msg-row {
  display: flex;
  width: 100%;
}

.msg-row.user {
  justify-content: flex-end;
}

.msg-row.assistant {
  justify-content: flex-start;
}

.msg-bubble {
  max-width: min(720px, 100%);
  padding: var(--space-sm);
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
}

.msg-row.user .msg-bubble {
  background: linear-gradient(135deg, rgba(214, 64, 44, 0.18), rgba(214, 64, 44, 0.28));
  border-color: rgba(214, 64, 44, 0.5);
}

.msg-content {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  word-break: break-word;
}

.msg-content p {
  margin: 0 0 var(--space-xs);
}

.msg-content p:last-child {
  margin-bottom: 0;
}

.msg-content code {
  background: rgba(255, 255, 255, 0.06);
  padding: 0.15em 0.35em;
  border-radius: 6px;
}

.msg-content pre {
  background: #0f1218;
  border: 1px solid var(--border);
  padding: var(--space-sm);
  border-radius: 10px;
  overflow-x: auto;
}

.thinking {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.thinking .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  opacity: 0.6;
  animation: thinking 1.4s infinite ease-in-out;
}

.thinking .d1 {
  animation-delay: 0.1s;
}

.thinking .d2 {
  animation-delay: 0.25s;
}

@keyframes thinking {
  0%,
  80%,
  100% {
    transform: scale(0.8);
    opacity: 0.4;
  }

  40% {
    transform: scale(1);
    opacity: 0.9;
  }
}

.msg-content .katex {
  color: var(--text);
}

.msg-content .katex-display {
  margin: var(--space-sm) 0;
  padding: var(--space-xs);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  overflow-x: auto;
}

.msg-content .katex-display > .katex {
  white-space: normal;
}

.actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.4rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
  border-color: rgba(126, 165, 255, 0.4);
}

.button.primary {
  background: linear-gradient(135deg, rgba(126, 165, 255, 0.2), rgba(126, 165, 255, 0.4));
  border-color: rgba(126, 165, 255, 0.5);
}

.button.ghost {
  background: transparent;
  color: var(--muted);
}

.feeds {
  margin-top: var(--space-xl);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  background: linear-gradient(135deg, #12151c, #0e1218);
  box-shadow: var(--shadow);
}

.feeds-header h2 {
  margin: 0 0 var(--space-sm);
  font-size: 1.8rem;
  text-transform: uppercase;
}

.feed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.feed-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  background: linear-gradient(145deg, var(--panel), var(--panel-strong));
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  position: relative;
  overflow: hidden;
}

.feed-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(214, 64, 44, 0.08), transparent 60%);
  opacity: 0.7;
  pointer-events: none;
}

.feed-card h3 {
  margin: 0 0 var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.feed-card p {
  margin: 0;
  color: var(--muted);
}

.footer {
  border-top: 1px solid var(--border);
  margin-top: var(--space-xxl);
  padding: var(--space-lg) 0 var(--space-xl);
  background: rgba(10, 12, 16, 0.92);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer a {
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 120ms ease;
}

.footer a:hover,
.footer a:focus-visible {
  color: var(--text);
}

.micro {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

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

  .nav-links {
    gap: var(--space-sm);
  }

  .hero,
  .feeds {
    padding: var(--space-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}