/* =====================================================================
   KOSEN Student iFolio — Base (tokens, reset, typography, utilities)
   ===================================================================== */
:root {
  /* Brand */
  --primary: #0072BF;
  --primary-hover: #005F9E;
  --primary-dark: #004C80;
  --primary-light: #EAF5FC;
  --primary-extra-light: #F5FAFE;
  --primary-ring: rgba(0, 114, 191, .12);

  /* Neutrals */
  --white: #FFFFFF;
  --background: #F7F9FC;
  --text: #202124;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --border: #E5EAF0;
  --input-border: #DDE3EA;
  --surface-muted: #F3F6F9;

  /* Status */
  --success: #22C55E;
  --success-dark: #15803D;
  --success-light: #F0FDF4;
  --warning: #F59E0B;
  --warning-dark: #B45309;
  --warning-light: #FFFBEB;
  --danger: #EF4444;
  --danger-dark: #B91C1C;
  --danger-light: #FEF2F2;
  --info-light: #EFF6FF;

  /* Shape */
  --radius-sm: 6px;
  --radius: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-xl: 14px;
  --radius-2xl: 20px;
  --radius-full: 999px;

  --shadow-xs: 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .03);
  --shadow-md: 0 6px 16px rgba(16, 24, 40, .08);
  --shadow-lg: 0 16px 40px rgba(16, 24, 40, .14);

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-rail: 76px;
  --topbar-height: 64px;
  --content-max: 1280px;

  --font-sans: 'Noto Sans Thai', 'IBM Plex Sans Thai', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --transition: 160ms ease;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video { display: block; max-width: 100%; }
svg.icon { display: inline-block; flex-shrink: 0; vertical-align: middle; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
p { margin: 0; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.35; font-weight: 600; color: var(--text); }
h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 17px; }
h4 { font-size: 15px; }
ul, ol { margin: 0; padding: 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
::selection { background: var(--primary-light); color: var(--primary-dark); }

/* ---------- Typography helpers ---------- */
.text-xs { font-size: 12px; }
.text-sm { font-size: 13px; }
.text-base { font-size: 14px; }
.text-md { font-size: 15px; }
.text-lg { font-size: 17px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }
.text-muted { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-primary { color: var(--primary); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success-dark); }
.text-warning { color: var(--warning-dark); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.pre-line { white-space: pre-line; }
.break-word { overflow-wrap: anywhere; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- Layout utilities ---------- */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1 1 0%; min-width: 0; }
.shrink-0 { flex-shrink: 0; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-5 { gap: 20px; }
.gap-6 { gap: 24px; }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.ml-auto { margin-left: auto; }
.w-full { width: 100%; }
.min-w-0 { min-width: 0; }
.stack > * + * { margin-top: 16px; }
.stack-lg > * + * { margin-top: 24px; }
.hidden, [hidden] { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

@media (max-width: 767px) {
  .hide-mobile { display: none !important; }
}
@media (min-width: 768px) {
  .show-mobile { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}