/* =========================================================
   Career Hub — Global Styles
   Design tokens, reset, and base typography
   ========================================================= */

:root {
  /* Colour palette */
  --color-primary:        #2563EB;   /* blue-600 */
  --color-primary-hover:  #1D4ED8;   /* blue-700 */
  --color-primary-light:  #EFF6FF;   /* blue-50 */
  --color-text:           #111827;   /* gray-900 */
  --color-text-secondary: #6B7280;   /* gray-500 */
  --color-text-muted:     #9CA3AF;   /* gray-400 */
  --color-border:         #E5E7EB;   /* gray-200 */
  --color-bg:             #FFFFFF;
  --color-bg-subtle:      #F9FAFB;   /* gray-50 */
  --color-bg-muted:       #F3F4F6;   /* gray-100 */
  --color-success:        #16A34A;   /* green-600 */
  --color-error:          #DC2626;   /* red-600 */
  --color-warning:        #D97706;   /* amber-600 */
  --color-star:           #F59E0B;   /* amber-400 */

  /* Spacing scale */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Typography */
  --font-family:   -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs:  12px;
  --font-size-sm:  14px;
  --font-size-base: 16px;
  --font-size-lg:  18px;
  --font-size-xl:  20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  --line-height-tight:  1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Borders */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);

  /* Layout */
  --container-max: 1200px;
  --container-padding: var(--space-6);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ---- Layout utilities ---- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.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;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: var(--font-size-sm);
  line-height: 1;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-hover);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  background-color: var(--color-bg-muted);
  color: var(--color-text);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
}

/* ---- Form elements ---- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  line-height: var(--line-height-normal);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* ---- Alert / message ---- */
.alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.alert-success {
  background-color: #F0FDF4;
  color: var(--color-success);
  border: 1px solid #86EFAC;
}

.alert-error {
  background-color: #FEF2F2;
  color: var(--color-error);
  border: 1px solid #FCA5A5;
}

/* ---- Tags / chips ---- */
.tag {
  display: inline-block;
  padding: 2px var(--space-2);
  background-color: var(--color-bg-muted);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); text-decoration: none; }
.breadcrumb-sep { color: var(--color-text-muted); }

/* ---- Empty state ---- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-6);
  text-align: center;
  color: var(--color-text-secondary);
}

.empty-state h3 {
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

/* ---- Loading skeleton ---- */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-muted) 25%, var(--color-border) 50%, var(--color-bg-muted) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  :root {
    --container-padding: var(--space-4);
  }
}