frontend/src/index.css

@import "tailwindcss";

/* ── Design Tokens ─────────────────────────────────────── */
@theme {
  /* Surfaces */
  --color-surface: #f8f8fa;
  --color-surface-white: #ffffff;
  --color-surface-warm: #f3f2f0;
  --color-surface-hover: #f0eff2;

  /* Borders */
  --color-border: rgba(0, 0, 0, 0.06);
  --color-border-subtle: rgba(0, 0, 0, 0.04);
  --color-border-focus: rgba(99, 102, 241, 0.35);

  /* Text */
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a5e;
  --color-text-muted: #8b8b9e;
  --color-text-dim: #b5b5c6;
  --color-text-ghost: #d0d0da;

  /* Accent */
  --color-accent: #6366f1;
  --color-accent-light: #818cf8;
  --color-accent-soft: rgba(99, 102, 241, 0.08);
  --color-accent-softer: rgba(99, 102, 241, 0.04);

  /* Semantic */
  --color-emerald: #34d399;
  --color-emerald-soft: rgba(52, 211, 153, 0.10);
  --color-amber: #fbbf24;
  --color-amber-soft: rgba(251, 191, 36, 0.10);
  --color-blue: #60a5fa;
  --color-blue-soft: rgba(96, 165, 250, 0.08);
  --color-rose: #fb7185;
  --color-rose-soft: rgba(251, 113, 133, 0.08);

  /* Typography */
  --font-family-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'SF Mono', monospace;
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  min-height: 100dvh;
  overflow-x: hidden;
}

#root {
  min-height: 100dvh;
}

/* ── Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.14);
}

/* ── Cards — glassmorphic ─────────────────────────────── */
.card {
  background: rgba(255, 255, 255, 0.30);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border: none;
  box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.35),
              0 2px 8px rgba(0, 0, 0, 0.02),
              0 8px 20px rgba(0, 0, 0, 0.012);
}

.card-elevated {
  background: rgba(255, 255, 255, 0.38);
  backdrop-filter: blur(28px) saturate(1.4);
  -webkit-backdrop-filter: blur(28px) saturate(1.4);
  border: none;
  box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.4),
              0 2px 8px rgba(0, 0, 0, 0.03),
              0 8px 24px rgba(0, 0, 0, 0.02);
}

/* ── User message bubble ──────────────────────────────── */
.bubble-user {
  background: rgba(99, 102, 241, 0.08);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: none;
  box-shadow: none;
}

/* ── Agent message bubble ─────────────────────────────── */
.bubble-agent {
  background: rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border: none;
  box-shadow: none;
}

/* ── Input ─────────────────────────────────────────────── */
.input-glass {
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(28px) saturate(1.4);
  -webkit-backdrop-filter: blur(28px) saturate(1.4);
  border: none;
  box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.35),
              0 2px 8px rgba(0, 0, 0, 0.02),
              0 8px 24px rgba(0, 0, 0, 0.015);
  transition: box-shadow 0.4s ease, transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.input-glass:focus-within {
  box-shadow: inset 0 0 0 0.5px rgba(99, 102, 241, 0.2),
              0 2px 8px rgba(0, 0, 0, 0.02),
              0 8px 24px rgba(0, 0, 0, 0.015),
              0 0 0 3px rgba(99, 102, 241, 0.05);
  transform: scale(1.008);
}

/* ── Header — glass bar ───────────────────────────────── */
.header-glass {
  background: rgba(248, 248, 250, 0.5);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border: none;
  border-bottom: none;
}

/* ── Message content ───────────────────────────────────── */
.message-content {
  line-height: 1.75;
  letter-spacing: 0.005em;
}
.message-content p { margin-bottom: 0.6em; }
.message-content p:last-child { margin-bottom: 0; }
.message-content ul, .message-content ol {
  margin: 0.5em 0;
  padding-left: 1.4em;
}
.message-content li { margin-bottom: 0.3em; }
.message-content strong {
  color: var(--color-text-primary);
  font-weight: 600;
}
.message-content code {
  background: rgba(99, 102, 241, 0.08);
  color: var(--color-accent);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  font-size: 0.85em;
  font-family: var(--font-family-mono);
}

/* ── Heading styles inside messages ────────────────────── */
.message-content h1, .message-content h2, .message-content h3 {
  font-weight: 650;
  color: var(--color-text-primary);
  margin-top: 0.8em;
  margin-bottom: 0.4em;
}
.message-content h1 { font-size: 1.1em; }
.message-content h2 { font-size: 1.0em; }
.message-content h3 { font-size: 0.95em; }
.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child { margin-top: 0; }

/* ── Selection ─────────────────────────────────────────── */
::selection {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-text-primary);
}