/* ============================================================
   DGA Design System — สพร. (Digital Government Agency)
   Design Tokens, Color Palette, Typography, Spacing
   WCAG 2.2 AA Compliant | OKLCH Color Space
   ============================================================ */

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

:root {
  /* ─── Color Palette (OKLCH) ─── */
  /* ══════════════════════════════════════════════════════
     DGA Brand Colors (ตรงจากโลโก้จริง)
     Primary Blue: #1C164B  |  Accent Orange: #F05123
     ══════════════════════════════════════════════════════ */

  /* Primary: DGA Navy Blue #1C164B (hue 279.4°) */
  --color-primary-900: oklch(0.155 0.080 279.4);  /* #09032d */
  --color-primary-800: oklch(0.185 0.092 279.4);  /* #0e073a */
  --color-primary-700: oklch(0.224 0.104 279.4);  /* #150e4a */
  --color-primary-600: oklch(0.244 0.104 279.4);  /* #19144f — brand exact #1C164B */
  --color-primary:     oklch(0.244 0.104 279.4);  /* #19144f — brand exact */
  --color-primary-500: oklch(0.340 0.100 279.4);  /* #2f2f6a */
  --color-primary-400: oklch(0.440 0.092 279.4);  /* #494c84 */
  --color-primary-300: oklch(0.580 0.080 279.4);  /* #7075a9 */
  --color-primary-200: oklch(0.720 0.065 279.4);  /* #9ca1cd */
  --color-primary-100: oklch(0.850 0.038 279.4);  /* #c8cce7 */
  --color-primary-50:  oklch(0.950 0.012 279.4);  /* #eceef7 */

  /* Accent: DGA Orange #F05123 (hue 36.4°) */
  --color-accent-700: oklch(0.550 0.185 36.4);    /* #ce2c00 */
  --color-accent-600: oklch(0.600 0.200 36.4);    /* #e04000 */
  --color-accent-500: oklch(0.648 0.205 36.4);    /* #f0501e — brand exact #F05123 */
  --color-accent:     oklch(0.648 0.205 36.4);    /* #f0501e — brand exact */
  --color-accent-400: oklch(0.688 0.168 36.4);    /* #fb631f */
  --color-accent-300: oklch(0.730 0.130 36.4);    /* #fd894a */
  --color-accent-200: oklch(0.800 0.090 36.4);    /* #feac79 */
  --color-accent-100: oklch(0.880 0.055 36.4);    /* #fed4b6 */
  --color-accent-50:  oklch(0.950 0.025 36.4);    /* #fff0e3 */

  /* Success */
  --color-success-700: oklch(0.45 0.12 155);
  --color-success: oklch(0.55 0.14 155);
  --color-success-100: oklch(0.92 0.04 155);

  /* Warning */
  --color-warning-700: oklch(0.55 0.14 85);
  --color-warning: oklch(0.75 0.15 85);
  --color-warning-100: oklch(0.94 0.04 85);

  /* Error */
  --color-error-700: oklch(0.42 0.15 25);
  --color-error: oklch(0.55 0.18 25);
  --color-error-100: oklch(0.92 0.04 25);

  /* Info (maps to primary blue) */
  --color-info-700: var(--color-primary-800);
  --color-info: var(--color-primary-600);
  --color-info-100: var(--color-primary-50);

  /* Neutrals — tinted toward blue 279.4° */
  --color-ink: oklch(0.14 0.04 279.4);              /* #12101f */
  --color-ink-secondary: oklch(0.30 0.04 279.4);    /* #36355b */
  --color-ink-muted: oklch(0.48 0.03 279.4);        /* #65648a */
  --color-ink-disabled: oklch(0.70 0.02 279.4);     /* #a5a4be */
  --color-border: oklch(0.82 0.015 279.4);          /* #cbcaec */
  --color-border-light: oklch(0.90 0.010 279.4);    /* #e4e4f6 */
  --color-surface: oklch(0.95 0.008 279.4);         /* #f0f0fb */
  --color-surface-raised: oklch(0.98 0.005 279.4);  /* #f9f9fe */
  --color-bg: oklch(0.985 0.004 279.4);             /* #fbfbff */
  --color-white: #ffffff;

  /* ─── Typography ─── */
  --font-display: 'IBM Plex Sans Thai', 'IBM Plex Sans', system-ui, sans-serif;
  --font-body: 'Sarabun', 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Type Scale (1.25 ratio) */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: clamp(2.5rem, 5vw, 3.75rem); /* 40-60px responsive */

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Letter Spacing */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;

  /* ─── Spacing (4px base) ─── */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */

  /* ─── Border Radius ─── */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* ─── Shadows ─── */
  --shadow-xs: 0 1px 2px oklch(0.155 0.080 279.4 / 0.05);
  --shadow-sm: 0 1px 3px oklch(0.155 0.080 279.4 / 0.08), 0 1px 2px oklch(0.155 0.080 279.4 / 0.04);
  --shadow-md: 0 4px 6px oklch(0.155 0.080 279.4 / 0.06), 0 2px 4px oklch(0.155 0.080 279.4 / 0.04);
  --shadow-lg: 0 10px 15px oklch(0.155 0.080 279.4 / 0.08), 0 4px 6px oklch(0.155 0.080 279.4 / 0.04);
  --shadow-xl: 0 20px 25px oklch(0.155 0.080 279.4 / 0.10), 0 8px 10px oklch(0.155 0.080 279.4 / 0.04);
  --shadow-2xl: 0 25px 50px oklch(0.155 0.080 279.4 / 0.18);
  --shadow-inner: inset 0 2px 4px oklch(0.155 0.080 279.4 / 0.06);

  /* ─── Z-Index Scale ─── */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;
  --z-max: 700;

  /* ─── Transitions ─── */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;

  /* ─── Container ─── */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;
  --container-2xl: 1400px;
  --container-padding: var(--space-6);

  /* ─── Focus ─── */
  --focus-ring: 0 0 0 3px oklch(0.648 0.205 36.4 / 0.40);
  --focus-ring-primary: 0 0 0 3px oklch(0.224 0.104 279.4 / 0.30);
}

/* ─── Global Styles ─── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
  padding-top: env(safe-area-inset-top);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
}

/* ─── Typography Styles ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-ink);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-6xl);
  line-height: var(--leading-none);
  letter-spacing: -0.03em;
}

h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
}

h5 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

h6 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
}

p {
  max-width: 70ch;
  text-wrap: pretty;
}

a {
  color: var(--color-primary-500);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out-quart);
}

a:hover {
  color: var(--color-primary-700);
}

a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* ─── Skip Navigation (Accessibility) ─── */
.skip-nav {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-max);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--duration-fast) var(--ease-out-quart);
}

.skip-nav:focus {
  top: 0;
  outline: none;
}

/* ─── Visually Hidden (Screen Reader Only) ─── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ─── Selection ─── */
::selection {
  background: oklch(0.648 0.205 36.4 / 0.15);
  color: var(--color-primary-900);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-ink-disabled);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-ink-muted);
}

/* ─── Image & Media ─── */
img, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ─── Lists ─── */
ul, ol {
  list-style: none;
}

/* ─── Table ─── */
table {
  border-collapse: collapse;
  width: 100%;
}

/* ─── Button Reset ─── */
button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ─── Input Reset ─── */
input, textarea, select {
  font: inherit;
  color: inherit;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-primary);
}

/* --- Lucide Icons --- */
.lucide {
  display: inline-flex;
  align-self: center;
  width: 1.25em;
  height: 1.25em;
  stroke-width: 2px;
  stroke: currentColor;
  fill: none;
  vertical-align: -0.125em;
  margin-inline-end: 0.25rem;
}

.lucide:only-child {
  margin-inline-end: 0;
}

/* ─── High Contrast Themes (Visually Impaired) ─── */
body.theme-bw {
  --color-primary-900: #000;
  --color-primary-800: #000;
  --color-primary-700: #000;
  --color-primary-600: #000;
  --color-primary: #fff;
  --color-primary-50: #000;
  --color-accent: #fff;
  --color-accent-50: #000;
  --color-ink: #fff;
  --color-ink-secondary: #eee;
  --color-ink-muted: #ccc;
  --color-ink-disabled: #aaa;
  --color-border: #fff;
  --color-border-light: #555;
  --color-surface: #000;
  --color-surface-raised: #000;
  --color-bg: #000;
  --color-white: #000;
  background-color: #000 !important;
  color: #fff !important;
}

body.theme-bw *, body.theme-bw *::before, body.theme-bw *::after {
  border-color: #fff !important;
}

body.theme-bw .btn--primary,
body.theme-bw .btn--accent,
body.theme-bw .btn {
  background-color: #fff !important;
  color: #000 !important;
  border: 2px solid #fff !important;
}

body.theme-bw .btn--outline {
  background-color: #000 !important;
  color: #fff !important;
}

body.theme-bw a {
  color: #fff !important;
  text-decoration: underline !important;
}

body.theme-bw img, body.theme-bw video {
  filter: grayscale(100%) contrast(120%);
}

body.theme-yb {
  --color-primary-900: #000;
  --color-primary-800: #000;
  --color-primary-700: #000;
  --color-primary-600: #000;
  --color-primary: #ffeb3b;
  --color-primary-50: #000;
  --color-accent: #ffeb3b;
  --color-accent-50: #000;
  --color-ink: #ffeb3b;
  --color-ink-secondary: #fff59d;
  --color-ink-muted: #fff9c4;
  --color-ink-disabled: #fffde7;
  --color-border: #ffeb3b;
  --color-border-light: #555;
  --color-surface: #000;
  --color-surface-raised: #000;
  --color-bg: #000;
  --color-white: #000;
  background-color: #000 !important;
  color: #ffeb3b !important;
}

body.theme-yb *, body.theme-yb *::before, body.theme-yb *::after {
  border-color: #ffeb3b !important;
}

body.theme-yb .btn--primary,
body.theme-yb .btn--accent,
body.theme-yb .btn {
  background-color: #ffeb3b !important;
  color: #000 !important;
  border: 2px solid #ffeb3b !important;
}

body.theme-yb .btn--outline {
  background-color: #000 !important;
  color: #ffeb3b !important;
}

body.theme-yb a {
  color: #ffeb3b !important;
  text-decoration: underline !important;
}

body.theme-yb img, body.theme-yb video {
  filter: sepia(100%) hue-rotate(5deg) saturate(300%) contrast(150%);
}