/**
 * Design System — tokens
 * Fonte única de verdade visual (público e extensível ao painel)
 */
:root {
  /* —— Marca / cores base —— */
  --color-brand-50:  #e7f1ff;
  --color-brand-100: #cfe2ff;
  --color-brand-200: #9ec5fe;
  --color-brand-300: #6ea8fe;
  --color-brand-400: #3d8bfd;
  --color-brand-500: #0d6efd;
  --color-brand-600: #0a58ca;
  --color-brand-700: #084298;
  --color-brand-800: #052c65;
  --color-brand-900: #031633;

  --color-accent-400: #0dcaf0;
  --color-accent-500: #6610f2;
  --color-accent-600: #520dc2;

  /* —— Neutros —— */
  --color-gray-25:  #fcfcfd;
  --color-gray-50:  #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  --color-white: #ffffff;
  --color-black: #000000;

  /* —— Semânticas —— */
  --color-success: #198754;
  --color-success-bg: #d1e7dd;
  --color-warning: #ffc107;
  --color-warning-bg: #fff3cd;
  --color-danger: #dc3545;
  --color-danger-bg: #f8d7da;
  --color-info: #0dcaf0;
  --color-info-bg: #cff4fc;

  /* —— Superfícies —— */
  --surface-page: var(--color-gray-50);
  --surface-elevated: var(--color-white);
  --surface-muted: var(--color-gray-100);
  --surface-inverse: var(--color-gray-900);
  --surface-brand: var(--color-brand-500);

  /* —— Texto —— */
  --text-primary: var(--color-gray-800);
  --text-secondary: var(--color-gray-500);
  --text-muted: var(--color-gray-400);
  --text-inverse: var(--color-white);
  --text-link: var(--color-brand-500);
  --text-link-hover: var(--color-brand-600);

  /* —— Bordas —— */
  --border-subtle: var(--color-gray-200);
  --border-default: var(--color-gray-300);
  --border-strong: var(--color-gray-400);
  --border-focus: var(--color-brand-400);

  /* —— Tipografia —— */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-display: clamp(1.75rem, 4vw, 2.75rem);

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;
  --tracking-tight: -0.03em;
  --tracking-normal: 0;

  /* —— Espaçamento (escala 4px) —— */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* —— Raios —— */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-full: 9999px;

  /* —— Sombras —— */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.12);
  --shadow-focus: 0 0 0 3px rgba(13, 110, 253, 0.35);

  /* —— Motion —— */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration-normal: 200ms;
  --duration-slow: 320ms;

  /* —— Layout —— */
  --container-max: 1140px;
  --content-max: 820px;
  --prose-width: 42rem;
  --sidebar-width: 260px;
  --header-height: 3.75rem;
  --z-sticky: 1020;
  --z-modal: 1055;

  /* —— Gradientes —— */
  --gradient-hero: linear-gradient(135deg, var(--color-brand-500) 0%, var(--color-accent-500) 52%, var(--color-accent-400) 100%);
  --gradient-soft: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

/* Tema escuro opcional (data-theme="dark" no html) */
[data-theme="dark"] {
  --surface-page: var(--color-gray-900);
  --surface-elevated: #1a2332;
  --surface-muted: #15202b;
  --text-primary: var(--color-gray-100);
  --text-secondary: var(--color-gray-400);
  --text-muted: var(--color-gray-500);
  --border-subtle: #2a3648;
  --border-default: #334155;
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.45);
}

/* —— Acessibilidade: foco —— */
:root {
  --focus-ring: 0 0 0 3px rgba(13, 110, 253, 0.45);
}

[data-theme="dark"] {
  --color-brand-50: #152238;
  --gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #5b21b6 52%, #0e7490 100%);
}