/* ============================================================
   XILROS Design System — Core Tokens
   Colors, typography, spacing, radius, shadow, motion
   ============================================================ */

/* Fonts: Inter (UI) + JetBrains Mono (technical labels)
   Loaded from Google Fonts. Substitute self-hosted copies in
   /fonts when available. */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

:root {
  /* ---------- Brand / Accent ---------- */
  --color-primary: #0066CC;
  --color-primary-hover: #0071E3;
  --color-primary-on-dark: #2997FF;
  --color-primary-soft: rgba(0, 102, 204, 0.14);

  /* ---------- Dark surfaces ---------- */
  --color-canvas-dark: #0A172E;
  --color-surface-dark: #101F3A;
  --color-surface-dark-2: #142744;
  --color-surface-dark-3: #071020;
  --color-surface-black: #02060D;

  /* ---------- Light surfaces ---------- */
  --color-canvas-light: #FFFFFF;
  --color-canvas-soft: #F5F7FA;
  --color-surface-light: #FFFFFF;
  --color-surface-light-2: #EEF3F8;

  /* ---------- Text ---------- */
  --color-ink: #0B1220;
  --color-ink-muted: #5B6678;
  --color-text-on-dark: #F7F9FC;
  --color-text-muted-on-dark: #A9B6C8;
  --color-text-soft-on-dark: #D8E2F0;

  /* ---------- Borders / dividers ---------- */
  --color-border-dark: rgba(216, 226, 240, 0.12);
  --color-border-light: rgba(11, 18, 32, 0.10);
  --color-divider-dark: rgba(216, 226, 240, 0.08);
  --color-divider-light: rgba(11, 18, 32, 0.08);

  /* ---------- Logo ---------- */
  --color-logo-on-dark: #F7F3E8;   /* ivory */
  --color-logo-on-light: #0A172E;  /* near-black navy */

  /* ---------- Type families ---------- */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* ---------- Spacing (8px base) ---------- */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-section: 96px;
  --space-section-tight: 64px;

  /* ---------- Container ---------- */
  --container-max: 1200px;
  --container-wide: 1440px;
  --pad-mobile: 20px;
  --pad-tablet: 32px;
  --pad-desktop: 48px;

  /* ---------- Radii ---------- */
  --radius-none: 0px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* ---------- Shadows ---------- */
  --shadow-none: none;
  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.18);
  --shadow-media: 0 20px 60px rgba(0, 0, 0, 0.28);
  --shadow-focus: 0 0 0 3px rgba(0, 113, 227, 0.35);

  /* ---------- Motion ---------- */
  --ease-standard: cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
  --dur-slow: 360ms;
}

/* ============================================================
   Semantic theme assignments
   ============================================================ */
:root,
[data-theme="dark"] {
  --bg: var(--color-canvas-dark);
  --bg-soft: var(--color-surface-dark);
  --bg-elevated: var(--color-surface-dark-2);
  --bg-deep: var(--color-surface-dark-3);
  --fg: var(--color-text-on-dark);
  --fg-muted: var(--color-text-muted-on-dark);
  --fg-soft: var(--color-text-soft-on-dark);
  --border: var(--color-border-dark);
  --divider: var(--color-divider-dark);
  --link: var(--color-primary-on-dark);
  --logo: var(--color-logo-on-dark);
}

[data-theme="light"] {
  --bg: var(--color-canvas-light);
  --bg-soft: var(--color-canvas-soft);
  --bg-elevated: var(--color-surface-light);
  --bg-deep: var(--color-surface-light-2);
  --fg: var(--color-ink);
  --fg-muted: var(--color-ink-muted);
  --fg-soft: var(--color-ink-muted);
  --border: var(--color-border-light);
  --divider: var(--color-divider-light);
  --link: var(--color-primary);
  --logo: var(--color-logo-on-light);
}

/* ============================================================
   Type scale — semantic
   ============================================================ */
.t-hero {
  font: 700 56px/1.05 var(--font-sans);
  letter-spacing: -0.03em;
}
.t-display-lg {
  font: 600 44px/1.1 var(--font-sans);
  letter-spacing: -0.025em;
}
.t-display-md {
  font: 600 34px/1.15 var(--font-sans);
  letter-spacing: -0.02em;
}
.t-section-title {
  font: 600 28px/1.2 var(--font-sans);
  letter-spacing: -0.01em;
}
.t-lead {
  font: 400 20px/1.55 var(--font-sans);
}
.t-body {
  font: 400 17px/1.6 var(--font-sans);
}
.t-body-strong {
  font: 600 17px/1.5 var(--font-sans);
}
.t-caption {
  font: 400 14px/1.45 var(--font-sans);
}
.t-label {
  font: 600 12px/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.t-mono-label {
  font: 500 12px/1.2 var(--font-mono);
  letter-spacing: 0.02em;
}
.t-nav {
  font: 500 14px/1 var(--font-sans);
}

/* Mobile scale-down */
@media (max-width: 640px) {
  .t-hero { font-size: 40px; }
  .t-display-lg { font-size: 34px; }
  .t-display-md { font-size: 28px; }
  .t-section-title { font-size: 24px; }
  .t-lead { font-size: 18px; }
}

/* ============================================================
   Element defaults (when applied within .xilros scope)
   ============================================================ */
.xilros {
  font-family: var(--font-sans);
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.xilros h1 { font: 700 56px/1.05 var(--font-sans); letter-spacing: -0.03em; margin: 0; }
.xilros h2 { font: 600 34px/1.15 var(--font-sans); letter-spacing: -0.02em; margin: 0; }
.xilros h3 { font: 600 24px/1.2 var(--font-sans); margin: 0; }
.xilros p { font: 400 17px/1.6 var(--font-sans); margin: 0; }
.xilros a { color: var(--link); text-decoration: none; }
.xilros a:hover { text-decoration: underline; text-underline-offset: 3px; }
.xilros code, .xilros kbd { font-family: var(--font-mono); font-size: 0.95em; }