/* ==========================================================================
   Nuzetta Design System v2
   Phase 9 Polish Pass
   ========================================================================== */

/* Shared design tokens - import in every page */
:root {
  /* Brand Colors - unified palette */
  --color-navy:        #0b1a2e;
  --color-navy-deep:   #0f2341;
  --color-teal:        #0d9488;
  --color-teal-light:  #2dd4bf;
  --color-teal-50:     #f0fdfa;
  --color-white:       #ffffff;

  /* Semantic Colors */
  --color-success:     #059669;
  --color-success-bg:  #d1fae5;
  --color-warning:     #d97706;
  --color-warning-bg:  #fef3c7;
  --color-error:       #dc2626;
  --color-error-bg:    #fee2e2;
  --color-info:        #2563eb;
  --color-info-bg:     #dbeafe;

  /* Neutral Palette */
  --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;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --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;

  /* Border radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(11,26,46,0.06);
  --shadow-md:  0 4px 12px rgba(11,26,46,0.08);
  --shadow-lg:  0 12px 32px rgba(11,26,46,0.12);

  /* Z-index layers */
  --z-sidebar:  50;
  --z-topbar:   40;
  --z-nav:      100;
}

/* ==========================================================================
   BASE RESET & GLOBAL
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px; /* minimum 16px for a11y */
}

body {
  font-family: var(--font-family);
  color: var(--color-navy);
  background: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   ACCESSIBILITY (WCAG 2.1 AA)
   ========================================================================== */

/* Skip Navigation Link - must be first focusable element */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-teal);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  z-index: 9999;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-navy-deep);
  outline-offset: 2px;
}

/* Global Focus Indicator - replaces browser default */
*:focus-visible {
  outline: 3px solid rgba(13,148,136,0.5);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Remove focus ring on mouse click (keep for keyboard) */
*:focus:not(:focus-visible) {
  outline: none;
}

/* Global button reset */
button {
  cursor: pointer;
  font-family: inherit;
}

/* Ensure 44x44px minimum touch targets on mobile */
@media (max-width: 768px) {
  button,
  a[href],
  input[type="submit"],
  input[type="button"],
  .btn {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */

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

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1 { font-size: 2.5rem;   font-weight: 800; line-height: 1.15; letter-spacing: -0.02em; }
h2 { font-size: 1.875rem; font-weight: 700; line-height: 1.2;  letter-spacing: -0.015em; }
h3 { font-size: 1.5rem;   font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
h4 { font-size: 1.25rem;  font-weight: 600; line-height: 1.3; }
h5 { font-size: 1rem;     font-weight: 600; line-height: 1.4; }

@media (max-width: 768px) {
  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: var(--z-nav);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(13,148,136,0.08);
}

.nav-logo {
  font-weight: 900;
  font-size: 1.35rem;
  color: var(--color-navy);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.nav-logo span { color: var(--color-teal); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-600);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--color-navy); }

/* Primary CTA button in nav */
.nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-teal);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background 0.2s, box-shadow 0.2s;
  display: inline-flex;
  align-items: center;
}
.nav-cta:hover {
  background: var(--color-teal-light);
  box-shadow: 0 4px 12px rgba(13,148,136,0.3);
}

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-navy);
}

@media (max-width: 768px) {
  .site-nav {
    padding: var(--space-3) var(--space-4);
  }
  .nav-links {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    gap: 0;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: var(--space-3) var(--space-2);
    border-bottom: 1px solid var(--color-gray-100);
  }
  .nav-hamburger { display: block; }
}

/* ==========================================================================
   SIDEBAR (for dashboard pages)
   ========================================================================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 240px;
  background: var(--color-navy);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sidebar);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-logo {
  padding: var(--space-6) var(--space-5) var(--space-4);
  font-size: 1.4rem;
  font-weight: 800;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  letter-spacing: -0.5px;
}
.sidebar-logo span { color: var(--color-teal-light); }

.sidebar-user {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-user .user-name { font-weight: 700; font-size: 0.9rem; }
.sidebar-user .user-role { font-size: 0.75rem; color: var(--color-gray-400); margin-top: 2px; }

.sidebar-nav { flex: 1; padding: var(--space-3) 0; overflow-y: auto; }

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255,255,255,0.65);
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  border-left: 3px solid transparent;
}
.nav-item:hover { color: var(--color-white); background: rgba(255,255,255,0.05); }
.nav-item.active {
  color: var(--color-teal-light);
  background: rgba(13,154,167,0.12);
  border-left-color: var(--color-teal-light);
}
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* Mobile sidebar toggle */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(11,26,46,0.5);
  z-index: calc(var(--z-sidebar) - 1);
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-close {
    display: block;
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }
}

/* ==========================================================================
   MAIN CONTENT AREA
   ========================================================================== */

.main-content {
  margin-left: 240px;
  min-height: 100vh;
}

.topbar {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
}
.topbar h1 { font-size: 1.2rem; font-weight: 700; }

.page-content {
  padding: var(--space-8);
  max-width: 1200px;
}

@media (max-width: 768px) {
  .main-content {
    margin-left: 0;
  }
  .topbar {
    padding: var(--space-3) var(--space-4);
  }
  .page-content {
    padding: var(--space-4);
  }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
  text-decoration: none;
  min-height: 44px;
  white-space: nowrap;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--color-teal);
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(13,148,136,0.25);
}
.btn-primary:hover {
  background: var(--color-teal-light);
  box-shadow: 0 4px 16px rgba(13,148,136,0.35);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-navy);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-300);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-white);
}
.btn-danger:hover { background: #b91c1c; }

.btn-ghost {
  background: transparent;
  color: var(--color-gray-600);
  border: 1px solid transparent;
}
.btn-ghost:hover {
  background: var(--color-gray-100);
  color: var(--color-navy);
}

.btn-sm { font-size: 0.8rem; padding: var(--space-2) var(--space-3); min-height: 36px; }
.btn-lg { font-size: 1rem; padding: var(--space-4) var(--space-8); min-height: 52px; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   FORM ELEMENTS (WCAG compliant)
   ========================================================================== */

.form-group { margin-bottom: var(--space-5); }

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-navy);
  background: var(--color-white);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: 48px; /* WCAG touch target */
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(13,148,136,0.15);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-gray-400);
}

/* Error state for form fields */
.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220,38,38,0.12);
}

.form-error {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-error);
  margin-top: var(--space-2);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-gray-400);
  margin-top: var(--space-1);
  line-height: 1.4;
}

/* ==========================================================================
   CARDS
   ========================================================================== */

.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-gray-100);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
}

/* Stat card (used in dashboards) */
.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}
.stat-card .label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-card .value {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--color-navy);
  margin: var(--space-1) 0;
  line-height: 1;
}
.stat-card .sub { font-size: 0.8rem; color: var(--color-gray-500); }

/* ==========================================================================
   STATUS BADGES
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-teal    { background: var(--color-teal-50);    color: var(--color-teal); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-error   { background: var(--color-error-bg);   color: var(--color-error); }
.badge-info    { background: var(--color-info-bg);    color: var(--color-info); }
.badge-gray    { background: var(--color-gray-100);   color: var(--color-gray-500); }

/* Trust verification badges */
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-success);
  background: var(--color-success-bg);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}
.trust-badge svg { width: 14px; height: 14px; }

/* ==========================================================================
   ALERTS & NOTIFICATIONS
   ========================================================================== */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-4);
}
.alert-icon { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; }
.alert-success { background: var(--color-success-bg); color: #065f46; border: 1px solid rgba(5,150,105,0.2); }
.alert-warning { background: var(--color-warning-bg); color: #92400e; border: 1px solid rgba(217,119,6,0.2); }
.alert-error   { background: var(--color-error-bg);   color: #991b1b; border: 1px solid rgba(220,38,38,0.2); }
.alert-info    { background: var(--color-info-bg);    color: #1e40af; border: 1px solid rgba(37,99,235,0.2); }

/* ==========================================================================
   TABLES (mobile-friendly)
   ========================================================================== */

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead {
  background: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-200);
}

th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-gray-500);
  white-space: nowrap;
}

td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-gray-100);
  color: var(--color-navy);
}

tr:last-child td { border-bottom: none; }

tbody tr:hover { background: var(--color-gray-50); }

/* Mobile: convert tables to cards */
@media (max-width: 640px) {
  .table-wrapper { border: none; }
  table, thead, tbody, tr, th, td { display: block; }
  thead { display: none; }
  tbody tr {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    padding: var(--space-4);
  }
  td { padding: var(--space-1) 0; border: none; display: flex; justify-content: space-between; align-items: center; }
  td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding-right: var(--space-4);
    min-width: 40%;
  }
}

/* ==========================================================================
   LOADING SKELETON
   ========================================================================== */

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.skeleton {
  background: var(--color-gray-200);
  border-radius: var(--radius-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-text {
  height: 1rem;
  margin-bottom: var(--space-2);
}
.skeleton-text:last-child { width: 70%; }

.skeleton-card {
  height: 120px;
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   EMPTY STATES
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-8);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  color: var(--color-gray-300);
}

.empty-state h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gray-600);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: 0.9rem;
  color: var(--color-gray-400);
  max-width: 360px;
  margin: 0 auto var(--space-5);
  line-height: 1.6;
}

/* ==========================================================================
   FOOTER (shared)
   ========================================================================== */

.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.7);
  padding: var(--space-8) var(--space-6);
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
}

.footer-brand { }
.footer-brand .footer-logo {
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--color-white);
  text-decoration: none;
}
.footer-brand .footer-logo span { color: var(--color-teal-light); }
.footer-brand p { margin-top: var(--space-3); color: rgba(255,255,255,0.5); }

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-white);
  margin-bottom: var(--space-3);
}

.footer-col a {
  display: block;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  padding: var(--space-1) 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--color-teal-light); }

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-6) auto 0;
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-trust {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.trust-micro {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}
.trust-micro svg { width: 14px; height: 14px; color: var(--color-teal-light); }

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-sm     { font-size: 0.875rem; }
.text-xs     { font-size: 0.75rem; }
.text-muted  { color: var(--color-gray-500); }

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

.mt-2  { margin-top: var(--space-2); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mb-2  { margin-bottom: var(--space-2); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.w-full { width: 100%; }
.hidden { display: none; }

/* Visual divider */
.divider {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-6) 0;
}

/* Period badge (for dashboard) */
.period-badge {
  background: rgba(13,148,136,0.08);
  color: var(--color-teal);
  font-size: 0.78rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}