:root {
  --bg-primary: #0f172a;
  --bg-surface: #111c33;
  --bg-surface-2: #16243f;
  --bg-surface-3: #1b2b49;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.28);

  --text-primary: #e5eefb;
  --text-secondary: rgba(226, 232, 240, 0.82);
  --text-muted: rgba(148, 163, 184, 0.75);
  --text-inverse: #ffffff;

  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.16);
  --accent-glow: rgba(99, 102, 241, 0.26);

  --authentic: #22c55e;
  --authentic-bg: rgba(34, 197, 94, 0.12);
  --authentic-glow: rgba(34, 197, 94, 0.24);

  --ai-generated: #f43f5e;
  --ai-generated-bg: rgba(244, 63, 94, 0.12);
  --ai-generated-glow: rgba(244, 63, 94, 0.24);

  --suspect: #f59e0b;
  --suspect-bg: rgba(245, 158, 11, 0.14);
  --suspect-glow: rgba(245, 158, 11, 0.24);

  --nav-bg: rgba(8, 17, 31, 0.72);
  --nav-border: rgba(148, 163, 184, 0.12);
  --nav-link: rgba(226, 232, 240, 0.72);
  --nav-link-hover-bg: rgba(99, 102, 241, 0.14);
  --theme-toggle-bg: rgba(99, 102, 241, 0.12);
  --theme-toggle-border: rgba(148, 163, 184, 0.12);

  --hero-bg: linear-gradient(180deg, #08111f 0%, #0f172a 45%, #0b1324 100%);
  --hero-accent-1: rgba(99, 102, 241, 0.22);
  --hero-accent-2: rgba(56, 189, 248, 0.12);
  --mesh-line: rgba(148, 163, 184, 0.08);
  --badge-bg: rgba(99, 102, 241, 0.12);
  --badge-border: rgba(129, 140, 248, 0.3);
  --badge-text: #c7d2fe;
  --badge-bg-strong-1: rgba(99, 102, 241, 0.22);
  --badge-bg-strong-2: rgba(56, 189, 248, 0.2);
  --heading-strong: #f8fafc;
  --body-soft: rgba(226, 232, 240, 0.72);
  --surface-card: rgba(15, 23, 42, 0.64);
  --surface-soft: rgba(15, 23, 42, 0.45);
  --surface-border: rgba(148, 163, 184, 0.14);
  --surface-border-strong: rgba(148, 163, 184, 0.22);
  --logo-grad-1: rgba(99, 102, 241, 0.25);
  --logo-grad-2: rgba(129, 140, 248, 0.55);
  --stat-label: rgba(191, 219, 254, 0.72);
  --diagram-line-1: rgba(99, 102, 241, 0.65);
  --diagram-line-2: rgba(56, 189, 248, 0.05);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 28px;

  --shadow-sm: 0 1px 3px rgba(2, 6, 23, 0.18), 0 1px 2px rgba(2, 6, 23, 0.14);
  --shadow-md: 0 12px 30px rgba(2, 6, 23, 0.24), 0 4px 12px rgba(2, 6, 23, 0.18);
  --shadow-lg: 0 24px 80px rgba(2, 6, 23, 0.38), 0 8px 20px rgba(2, 6, 23, 0.26);
}

:root[data-theme='light'] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-2: #eef2ff;
  --bg-surface-3: #e2e8f0;
  --border: rgba(15, 23, 42, 0.09);
  --border-strong: rgba(15, 23, 42, 0.18);

  --text-primary: #0f172a;
  --text-secondary: rgba(15, 23, 42, 0.82);
  --text-muted: rgba(51, 65, 85, 0.7);
  --text-inverse: #ffffff;

  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: rgba(79, 70, 229, 0.1);
  --accent-glow: rgba(79, 70, 229, 0.18);

  --authentic: #16a34a;
  --authentic-bg: rgba(22, 163, 74, 0.12);
  --authentic-glow: rgba(22, 163, 74, 0.18);

  --ai-generated: #e11d48;
  --ai-generated-bg: rgba(225, 29, 72, 0.12);
  --ai-generated-glow: rgba(225, 29, 72, 0.18);

  --suspect: #d97706;
  --suspect-bg: rgba(217, 119, 6, 0.12);
  --suspect-glow: rgba(217, 119, 6, 0.18);

  --nav-bg: rgba(255, 255, 255, 0.82);
  --nav-border: rgba(15, 23, 42, 0.08);
  --nav-link: rgba(15, 23, 42, 0.72);
  --nav-link-hover-bg: rgba(79, 70, 229, 0.08);
  --theme-toggle-bg: rgba(79, 70, 229, 0.08);
  --theme-toggle-border: rgba(15, 23, 42, 0.08);

  --hero-bg: linear-gradient(180deg, #f8fafc 0%, #eef2ff 46%, #e2e8f0 100%);
  --hero-accent-1: rgba(79, 70, 229, 0.14);
  --hero-accent-2: rgba(14, 165, 233, 0.08);
  --mesh-line: rgba(71, 85, 105, 0.09);
  --badge-bg: rgba(79, 70, 229, 0.1);
  --badge-border: rgba(79, 70, 229, 0.18);
  --badge-text: #4338ca;
  --badge-bg-strong-1: rgba(79, 70, 229, 0.12);
  --badge-bg-strong-2: rgba(14, 165, 233, 0.1);
  --heading-strong: #0f172a;
  --body-soft: rgba(15, 23, 42, 0.72);
  --surface-card: rgba(255, 255, 255, 0.82);
  --surface-soft: rgba(255, 255, 255, 0.72);
  --surface-border: rgba(15, 23, 42, 0.08);
  --surface-border-strong: rgba(15, 23, 42, 0.14);
  --logo-grad-1: rgba(79, 70, 229, 0.18);
  --logo-grad-2: rgba(14, 165, 233, 0.18);
  --stat-label: rgba(67, 56, 202, 0.78);
  --diagram-line-1: rgba(79, 70, 229, 0.5);
  --diagram-line-2: rgba(14, 165, 233, 0.08);

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 28px rgba(15, 23, 42, 0.1), 0 4px 10px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 24px 80px rgba(15, 23, 42, 0.14), 0 10px 24px rgba(15, 23, 42, 0.08);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at top, var(--accent-light), transparent 26%);
}

#root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  width: 100%;
}

img, video {
  max-width: 100%;
  display: block;
}

button, input, a, section, article, nav, div {
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(148, 163, 184, 0.35); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(148, 163, 184, 0.55); }

::selection { background: var(--accent-light); color: var(--text-primary); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}