/* ============================================
   NILE BRIDGE PORTAL — GLOBAL STYLESHEET
   ============================================
   Shared variables, reset, base styles, and
   reusable components used across all pages.
   ============================================ */


/* ============================================
   1. ROOT VARIABLES (Design System)
   ============================================ */
:root {
  /* Brand Colors */
  --color-primary:        #0A1F44;
  --color-primary-light:  #112a5e;
  --color-primary-dark:   #061533;
  --color-accent:         #C9952A;
  --color-accent-light:   #e0aa3e;
  --color-accent-dark:    #a87c1f;

  /* Neutral Colors */
  --color-bg:             #F7F8FA;
  --color-white:          #FFFFFF;
  --color-text:           #1C1C1E;
  --color-text-muted:     #6B7280;
  --color-text-light:     #9CA3AF;
  --color-border:         #E5E7EB;
  --color-border-light:   #F3F4F6;

  /* Status Colors */
  --color-success:        #22C55E;
  --color-success-bg:     #DCFCE7;
  --color-error:          #EF4444;
  --color-error-bg:       #FEE2E2;
  --color-warning:        #F59E0B;
  --color-warning-bg:     #FEF3C7;
  --color-info:           #3B82F6;
  --color-info-bg:        #DBEAFE;

  /* Stage Colors (Candidate Lifecycle) */
  --stage-active:             #C9952A;
  --stage-shortlisted:        #3B82F6;
  --stage-interview:          #8B5CF6;
  --stage-hired:              #22C55E;
  --stage-visa:               #F59E0B;
  --stage-travel:             #14B8A6;
  --stage-integrated:         #0A1F44;
  --stage-working:            #15803D;

  /* Overlay */
  --color-overlay:        rgba(10, 31, 68, 0.72);

  /* Typography */
  --font-main:    'Inter', sans-serif;
  --font-display: 'Poppins', sans-serif;

  /* Font Sizes */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  /* Font Weights */
  --weight-light:    300;
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  /* Spacing */
  --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;
  --space-24: 6rem;

  /* Layout */
  --container-max:    1200px;
  --container-pad:    1.5rem;
  --sidebar-width:    260px;
  --sidebar-collapsed: 80px;
  --header-height:    72px;

  /* Border Radius */
  --radius-sm:   0.375rem;
  --radius-md:   0.75rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-2xl:  2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.13);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
  --shadow-2xl: 0 24px 64px rgba(0,0,0,0.20);

  /* Transitions */
  --transition-fast:   0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow:   0.5s ease;

  /* Z-Index */
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-fixed:     300;
  --z-modal-bg:  400;
  --z-modal:     500;
  --z-toast:     600;
  --z-tooltip:   700;
}


/* ============================================
   2. RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

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

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

a:hover {
  color: var(--color-accent);
}

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

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

ul, ol {
  list-style: none;
}


/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  line-height: 1.2;
  color: var(--color-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-4);
}

.text-muted     { color: var(--color-text-muted); }
.text-light     { color: var(--color-text-light); }
.text-primary   { color: var(--color-primary); }
.text-accent    { color: var(--color-accent); }
.text-success   { color: var(--color-success); }
.text-error     { color: var(--color-error); }
.text-warning   { color: var(--color-warning); }

.text-center  { text-align: center; }
.text-left    { text-align: left; }
.text-right   { text-align: right; }

.font-bold     { font-weight: var(--weight-bold); }
.font-semibold { font-weight: var(--weight-semibold); }
.font-medium   { font-weight: var(--weight-medium); }


/* ============================================
   4. LAYOUT UTILITIES
   ============================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.flex-wrap     { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center  { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end   { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.grid          { display: grid; }
.hidden        { display: none; }
.block         { display: block; }
.inline-block  { display: inline-block; }

.w-full  { width: 100%; }
.h-full  { height: 100%; }
.min-h-screen { min-height: 100vh; }


/* ============================================
   5. BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-main);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Primary — Gold */
.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Secondary — Navy */
.btn-secondary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-light);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Outline */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-primary);
  background-color: var(--color-bg);
}

/* Ghost */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-border-light);
}

/* Danger */
.btn-danger {
  background-color: var(--color-error);
  color: var(--color-white);
}

.btn-danger:hover:not(:disabled) {
  background-color: #DC2626;
}

/* Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-block {
  width: 100%;
}

.btn-icon-only {
  padding: var(--space-3);
  width: 44px;
  height: 44px;
}


/* ============================================
   6. FORM INPUTS
   ============================================ */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-main);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(201, 149, 42, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-light);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-border-light);
  cursor: not-allowed;
  opacity: 0.7;
}

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

.form-error {
  display: block;
  color: var(--color-error);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
  min-height: 1rem;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

.required-star {
  color: var(--color-error);
  margin-left: 2px;
}

.form-optional {
  color: var(--color-text-muted);
  font-weight: var(--weight-regular);
  font-size: var(--text-xs);
}


/* ============================================
   7. CARDS
   ============================================ */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-primary);
}


/* ============================================
   8. BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success { background: var(--color-success-bg); color: #166534; }
.badge-error   { background: var(--color-error-bg);   color: #991B1B; }
.badge-warning { background: var(--color-warning-bg); color: #92400E; }
.badge-info    { background: var(--color-info-bg);    color: #1E40AF; }

/* Stage badges */
.badge-stage-active        { background: rgba(201, 149, 42, 0.15);  color: var(--stage-active); }
.badge-stage-shortlisted   { background: rgba(59, 130, 246, 0.15);  color: var(--stage-shortlisted); }
.badge-stage-interview     { background: rgba(139, 92, 246, 0.15);  color: var(--stage-interview); }
.badge-stage-hired         { background: rgba(34, 197, 94, 0.15);   color: var(--stage-hired); }
.badge-stage-visa          { background: rgba(245, 158, 11, 0.15);  color: var(--stage-visa); }
.badge-stage-travel        { background: rgba(20, 184, 166, 0.15);  color: var(--stage-travel); }
.badge-stage-integrated    { background: rgba(10, 31, 68, 0.15);    color: var(--stage-integrated); }
.badge-stage-working       { background: rgba(21, 128, 61, 0.15);   color: var(--stage-working); }


/* ============================================
   9. ALERTS / MESSAGES
   ============================================ */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-left: 4px solid;
}

.alert-success {
  background: var(--color-success-bg);
  color: #166534;
  border-color: var(--color-success);
}

.alert-error {
  background: var(--color-error-bg);
  color: #991B1B;
  border-color: var(--color-error);
}

.alert-warning {
  background: var(--color-warning-bg);
  color: #92400E;
  border-color: var(--color-warning);
}

.alert-info {
  background: var(--color-info-bg);
  color: #1E40AF;
  border-color: var(--color-info);
}


/* ============================================
   10. AVATARS
   ============================================ */
.avatar {
  display: inline-block;
  border-radius: var(--radius-full);
  overflow: hidden;
  background-color: var(--color-border);
  object-fit: cover;
}

.avatar-sm { width: 32px;  height: 32px; }
.avatar-md { width: 48px;  height: 48px; }
.avatar-lg { width: 64px;  height: 64px; }
.avatar-xl { width: 96px;  height: 96px; }


/* ============================================
   11. LOADING SPINNER
   ============================================ */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-white);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-dark {
  border-color: rgba(10, 31, 68, 0.2);
  border-top-color: var(--color-primary);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}


/* ============================================
   12. SCROLLBAR STYLING
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-light);
}


/* ============================================
   13. ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in   { animation: fadeIn   var(--transition-normal); }
.slide-up  { animation: slideUp  var(--transition-normal); }
.slide-down { animation: slideDown var(--transition-normal); }


/* ============================================
   14. RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --container-pad: 1rem;
  }
}

@media (max-width: 768px) {
  html { font-size: 15px; }
  
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
}

@media (max-width: 480px) {
  html { font-size: 14px; }
  
  .btn {
    padding: var(--space-3) var(--space-5);
  }
  
  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
  }
}


/* ============================================
   15. ACCESSIBILITY
   ============================================ */
.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;
}

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}