/* =============================================================
   tokens.css — єдине джерело design-токенів (SITE-CARD.md §4.2)
   Підключати ПЕРШИМ, одразу після reset.
   ============================================================= */
:root {
  color-scheme: light dark;

  /* Color — тематичні (інвертуються в темній темі)
     Light bg = platinum з логотипу (#d5d5d5), не чистий білий */
  --color-bg: #d5d5d5;
  --color-bg-muted: #dbdbdb;
  --color-surface: #e0e0e0;
  --color-text: #0a0a0a;
  --color-text-muted: #6e6e6e;
  --color-border: #c4c4c4;
  --color-accent: #0a0a0a;
  --color-accent-hover: #2a2a2a;
  --color-danger: #b3261e;
  --color-success: #1c6b3f;
  --color-text-inverse: #f5f5f5;

  /* Monochrome system — glass, elevation, studio lighting */
  --mono-glass-bg: color-mix(in srgb, var(--color-bg) 78%, transparent);
  --mono-glass-surface: color-mix(in srgb, var(--color-surface) 82%, transparent);
  --mono-glass-border: color-mix(in srgb, var(--color-border) 72%, transparent);
  --mono-studio-spot: color-mix(in srgb, var(--color-bg-muted) 88%, transparent);
  --mono-studio-floor: color-mix(in srgb, var(--color-surface) 55%, transparent);
  --mono-studio-center: color-mix(in srgb, var(--color-border) 45%, transparent);
  --gradient-page: linear-gradient(
    180deg,
    var(--color-bg) 0%,
    color-mix(in srgb, var(--color-bg-muted) 28%, var(--color-bg)) 100%
  );
  --gradient-glass: linear-gradient(
    165deg,
    color-mix(in srgb, var(--color-surface) 92%, transparent) 0%,
    color-mix(in srgb, var(--color-bg) 78%, transparent) 100%
  );
  --gradient-card: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-surface) 42%, var(--color-bg)) 0%,
    var(--color-bg) 38%
  );
  --elevation-soft: 0 2px 6px rgba(0, 0, 0, 0.04), 0 10px 28px rgba(0, 0, 0, 0.06);
  --elevation-lift: 0 6px 20px rgba(0, 0, 0, 0.07), 0 20px 44px rgba(0, 0, 0, 0.09);
  --elevation-inset: inset 0 1px 0 rgba(255, 255, 255, 0.65);

  /* Color — фіксовані (не залежать від теми: footer завжди "темна секція") */
  --color-ink: #111111;
  --color-ink-text: #f7f6f3;

  /* Typography */
  --font-sans: "Geist Sans", "Helvetica Neue", system-ui, sans-serif;
  --font-display: "Geist Sans", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height-body: 1.65;
  --line-height-heading: 1.12;
  --line-height-relaxed: 1.75;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-wide: 0.06em;
  --font-weight-heading: 600;
  --font-weight-display: 400;

  /* Spacing (mobile base) */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-section: 3rem;

  /* Layout */
  --container-padding: 1rem;
  --container-max: 87.5rem;
  --header-height: 3.5rem;
  --touch-min: 2.75rem; /* 44px */

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;

  /* Z-index */
  --z-header: 200;
  --z-drawer: 300;
  --z-modal: 400;

  /* Safe area iOS */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);

  /* Viewport height (dvh fallback) */
  --vh: 100dvh;
}

@media (min-width: 1024px) {
  :root {
    --container-padding: 2rem;
    --space-section: 5rem;
    --header-height: 4.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-fast: 0ms;
    --duration-base: 0ms;
  }
}

/* --- Темна тема ---
   1) Системна: якщо користувач ще не обирав вручну (немає [data-theme]).
   2) Ручна: [data-theme="dark"] — перемикач у header, static/js/modules/theme.js.
   --color-ink / --color-ink-text НЕ інвертуються — footer лишається темною секцією завжди. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a0a0a;
    --color-bg-muted: #141414;
    --color-surface: #1c1c1c;
    --color-text: #f5f5f5;
    --color-text-muted: #9a9a9a;
    --color-border: #333333;
    --color-accent: #ffffff;
    --color-accent-hover: #d8d8d8;
    --color-text-inverse: #0a0a0a;
    --elevation-soft: 0 2px 8px rgba(0, 0, 0, 0.28), 0 12px 32px rgba(0, 0, 0, 0.32);
    --elevation-lift: 0 8px 24px rgba(0, 0, 0, 0.36), 0 24px 52px rgba(0, 0, 0, 0.42);
    --elevation-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --color-bg: #d5d5d5;
  --color-bg-muted: #dbdbdb;
  --color-surface: #e0e0e0;
  --color-text: #0a0a0a;
  --color-text-muted: #6e6e6e;
  --color-border: #c4c4c4;
  --color-accent: #0a0a0a;
  --color-accent-hover: #2a2a2a;
  --color-text-inverse: #f5f5f5;
  --elevation-soft: 0 2px 6px rgba(0, 0, 0, 0.04), 0 10px 28px rgba(0, 0, 0, 0.06);
  --elevation-lift: 0 6px 20px rgba(0, 0, 0, 0.07), 0 20px 44px rgba(0, 0, 0, 0.09);
  --elevation-inset: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0a0a0a;
  --color-bg-muted: #141414;
  --color-surface: #1c1c1c;
  --color-text: #f5f5f5;
  --color-text-muted: #9a9a9a;
  --color-border: #333333;
  --color-accent: #ffffff;
  --color-accent-hover: #d8d8d8;
  --color-text-inverse: #0a0a0a;
  --elevation-soft: 0 2px 8px rgba(0, 0, 0, 0.28), 0 12px 32px rgba(0, 0, 0, 0.32);
  --elevation-lift: 0 8px 24px rgba(0, 0, 0, 0.36), 0 24px 52px rgba(0, 0, 0, 0.42);
  --elevation-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}