/* SWE-chat shared design tokens and base styles */

:root {
  --bg: #111113;
  --bg-secondary: #1a1a1e;
  --bg-card: #1e1e22;
  --text: #e8e8ec;
  --text-secondary: #9898a0;
  --accent: #5b8def;
  --accent-hover: #7ba5f7;
  --green: #4ade80;
  --green-dim: rgba(74, 222, 128, 0.12);
  --orange: #f59e0b;
  --orange-dim: rgba(245, 158, 11, 0.12);
  --red: #ef4444;
  --red-dim: rgba(239, 68, 68, 0.12);
  --blue: #60a5fa;
  --blue-dim: rgba(96, 165, 250, 0.12);
  --purple: #a78bfa;
  --purple-dim: rgba(167, 139, 250, 0.12);
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.12);
  --border: #2a2a30;
  --nav-bg: rgba(17, 17, 19, 0.85);
  --code-bg: #16161a;
  --font: 'Charter', 'Iowan Old Style', 'Palatino Linotype', 'Source Serif Pro', Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-card: #ffffff;
  --text: #1a1a1e;
  --text-secondary: #6b6b73;
  --border: #e0e0e5;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --code-bg: #f0f0f4;
  --accent: #3b6fd4;
  --accent-hover: #2b5bb8;
  --green-dim: rgba(74, 222, 128, 0.15);
  --orange-dim: rgba(245, 158, 11, 0.15);
  --red-dim: rgba(239, 68, 68, 0.15);
  --blue-dim: rgba(96, 165, 250, 0.18);
  --purple-dim: rgba(167, 139, 250, 0.18);
  --cyan-dim: rgba(34, 211, 238, 0.15);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 1.02rem;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, .nav-logo, .nav-links a, .btn, button { font-family: var(--sans); }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 4px;
}

/* Nav */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}
.nav-inner {
  max-width: var(--max-width, 1100px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav-logo {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a svg { vertical-align: middle; }
#theme-toggle {
  background: none; border: none; cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  display: flex; align-items: center;
}
#theme-toggle:hover { color: var(--text); }

/* Footer */
footer {
  max-width: var(--max-width, 1100px);
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid var(--border);
  text-align: center;
}
footer p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Fade in animation */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}