/* Modern Design System - Refined UI */
:root {
  /* Color Palette - Soft Blue Theme for Personal Memory */
  --color-slate-50: #f8fafc;
  --color-slate-100: #f1f5f9;
  --color-slate-200: #e2e8f0;
  --color-slate-300: #cbd5e1;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1e293b;
  --color-slate-900: #0f172a;
  --color-cream: #fafaf9;

  /* Soft Blue Primary Colors - More Refined */
  --color-marine: #3b82f6;
  --color-marine-50: #eff6ff;
  --color-marine-100: #dbeafe;
  --color-marine-200: #bfdbfe;
  --color-marine-300: #93c5fd;
  --color-marine-400: #60a5fa;
  --color-marine-500: #3b82f6;
  --color-marine-600: #2563eb;
  --color-marine-700: #1d4ed8;
  --color-marine-800: #1e40af;
  --color-marine-900: #1e3a8a;
  
  /* Ocean Accent Colors */
  --color-ocean: #0891b2;
  --color-ocean-50: #ecfeff;
  --color-ocean-100: #cffafe;
  --color-ocean-200: #a5f3fc;
  --color-ocean-600: #0891b2;
  --color-ocean-700: #0e7490;
  
  /* Trust & Memory Theme */
  --color-trust: #059669;
  --color-memory: #7c3aed;
  --color-warning: #f59e0b;
  --color-marine-light: rgba(37, 99, 235, 0.1);
  --color-marine-selection: rgba(37, 99, 235, 0.3);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Shadows - Softer and More Subtle */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.03);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.06), 0 1px 2px -1px rgb(0 0 0 / 0.06);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.08);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Border Radius - More Refined */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;

  /* Breakpoints */
  --breakpoint-nav: 900px;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
}

::selection {
  background-color: var(--color-marine-selection);
  color: white;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-slate-700);
  background: linear-gradient(to bottom, var(--color-slate-50) 0%, var(--color-cream) 100%);
  margin: 0;
  padding: 0;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex: 1 0 auto;
  container-type: inline-size;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-4) 0;
  color: var(--color-slate-900);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.875rem);
}

p {
  margin: 0 0 var(--space-4) 0;
  color: var(--color-slate-600);
}

.text-base {
  font-size: 1rem;
  line-height: 1.6;
}

.text-sm {
  font-size: 0.95rem;
  line-height: 1.5;
}

.text-xs {
  font-size: 0.875rem;
  line-height: 1.4;
}

.text-muted {
  color: var(--color-slate-600);
}

/* Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  border: 1px solid var(--color-slate-200);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform, box-shadow;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  border-color: var(--color-marine-200);
}

/* Navigation */
.nav {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-slate-200);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-xs);
  transition: box-shadow 0.2s ease;
}

/* Backdrop blur with fallback for older browsers */
@supports (backdrop-filter: blur(12px)) {
  .nav {
    backdrop-filter: blur(12px) saturate(180%);
    background: rgba(255, 255, 255, 0.85);
  }
}

@supports not (backdrop-filter: blur(12px)) {
  .nav {
    background: white;
  }
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex: 1 1 auto;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-slate-900);
  text-decoration: none;
}

.nav-brand-mark {
  border-radius: 20%;
  box-shadow: var(--shadow-xs);
}

.nav-brand:hover {
  color: var(--color-marine-700);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-md);
  background: white;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-toggle:focus-visible {
  outline: 3px solid var(--color-marine-200);
  outline-offset: 2px;
}

.nav-toggle:hover {
  border-color: var(--color-marine-300);
  box-shadow: var(--shadow-sm);
}

.nav-toggle-icon {
  position: relative;
  width: 20px;
  height: 16px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-slate-700);
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-menu li {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-slate-600);
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease;
  position: relative;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-marine-700);
  background: var(--color-marine-50);
  outline: 2px solid var(--color-marine-200);
  outline-offset: 2px;
}

.nav-link:focus-visible .nav-link-icon {
  transform: scale(1.05);
}

.nav-link.active {
  color: var(--color-marine-700);
  background: var(--color-marine-50);
}

.nav-link-icon {
  font-size: 1.1rem;
}

.nav-link-logout {
  color: #dc2626;
}

.nav-link-logout:hover,
.nav-link-logout:focus-visible {
  color: #b91c1c;
  background: rgba(220, 38, 38, 0.08);
}

.nav-menu-divider {
  display: none;
}

.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;
}

/* Mobile navigation - breakpoint matches --breakpoint-nav (900px) */
@media (max-width: 899px) {
  .nav {
    padding: var(--space-3) 0;
  }

  .nav .container {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-content {
    width: 100%;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-slate-200);
    box-shadow: var(--shadow-sm);
    background: white;
    transition: transform 0.2s ease, opacity 0.2s ease;
    transform-origin: top center;
  }

  [data-enhanced="true"][data-menu-open="false"] .nav-menu {
    opacity: 0;
    transform: scaleY(0.95);
    pointer-events: none;
    height: 0;
    padding-top: 0;
    padding-bottom: 0;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-link {
    justify-content: space-between;
    width: 100%;
    font-size: 0.95rem;
  }

  .nav-menu-divider {
    display: block;
    height: 1px;
    background: var(--color-slate-200);
    margin: var(--space-2) 0;
  }

  .nav[data-menu-open="true"] .nav-toggle-icon span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav[data-menu-open="true"] .nav-toggle-icon span:nth-child(2) {
    opacity: 0;
  }

  .nav[data-menu-open="true"] .nav-toggle-icon span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle-icon span,
  .nav-link {
    transition: none;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: inherit;
  box-shadow: var(--shadow-xs);
  min-height: 44px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-marine-500), var(--color-marine-600));
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-marine-600), var(--color-marine-700));
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: white;
  color: var(--color-slate-700);
  border: 1px solid var(--color-slate-300);
}

.btn-secondary:hover {
  background: var(--color-slate-50);
  border-color: var(--color-marine-300);
  color: var(--color-marine-700);
}

.btn-ghost {
  background: transparent;
  color: var(--color-slate-700);
  border: 1px dashed var(--color-slate-300);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-style: solid;
  color: var(--color-marine-700);
  background: var(--color-marine-50);
}

.btn-tertiary {
  background: var(--color-slate-100);
  color: var(--color-slate-800);
  border: 1px solid var(--color-slate-200);
}

.btn-tertiary:hover,
.btn-tertiary:focus-visible {
  background: var(--color-slate-50);
  color: var(--color-marine-700);
  border-color: var(--color-marine-200);
}

.btn:focus-visible {
  outline: 3px solid var(--color-marine-200);
  outline-offset: 2px;
  box-shadow: var(--shadow-sm);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--color-slate-500);
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--space-2);
  line-height: 1;
  border-radius: var(--radius-md);
}

.btn-close:hover,
.btn-close:focus-visible {
  background: var(--color-slate-100);
  color: var(--color-slate-700);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  min-height: 40px;
}

.btn-wide {
  min-width: 130px;
}

.btn-xs {
  padding: var(--space-2) var(--space-3);
  font-size: 0.8rem;
  min-height: 34px;
}

.btn-icon {
  padding: var(--space-2);
  width: 40px;
  min-height: 40px;
  border-radius: var(--radius-md);
}

.btn-danger {
  background: #ef4444;
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-soft-primary {
  background: var(--color-marine-50);
  color: var(--color-marine-800);
  border: 1px solid var(--color-marine-200);
}

.btn-soft-primary:hover,
.btn-soft-primary:focus-visible {
  background: var(--color-marine-100);
  color: var(--color-marine-800);
  border-color: var(--color-marine-300);
}

.btn-soft-danger {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.btn-soft-danger:hover,
.btn-soft-danger:focus-visible {
  background: #fee2e2;
  color: #b91c1c;
  border-color: #fca5a5;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th,
.table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-slate-200);
}

.table th {
  background: var(--color-slate-50);
  font-weight: 600;
  color: var(--color-slate-800);
  font-size: 0.875rem;
  letter-spacing: 0.025em;
}

.table tbody tr:hover {
  background: var(--color-slate-50);
}

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

/* Footer */
.footer {
  background: linear-gradient(to bottom, var(--color-slate-900), var(--color-slate-800));
  color: var(--color-slate-300);
  padding: var(--space-8) 0;
  margin-top: var(--space-16);
  border-top: 1px solid var(--color-slate-700);
}

.footer a {
  color: var(--color-slate-200);
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: 1px solid transparent;
}

.footer a:hover {
  color: var(--color-marine-300);
  border-bottom-color: var(--color-marine-300);
}

/* Welcome Page Specific */
body.welcome {
  background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-slate-50) 100%);
  overflow: hidden;
}

.welcome-hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  text-align: center;
}

.welcome-content {
  max-width: 600px;
  padding: var(--space-8);
}

.welcome-title {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-slate-900) 0%, var(--color-marine) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-6);
  animation: fadeInUp 1s ease-out;
}

.welcome-subtitle {
  font-size: 1.25rem;
  color: var(--color-slate-600);
  margin-bottom: var(--space-8);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.welcome-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-8);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
/* Personal Memory Dashboard Specific Styles */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.category-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  border: 1px solid var(--color-slate-200);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--color-marine-100) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0.4;
  transition: all 0.3s ease;
}

.category-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-marine-200);
}

.category-card:hover::before {
  opacity: 0.6;
  transform: scale(1.1);
}

.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.category-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-marine-500), var(--color-marine-600));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  box-shadow: var(--shadow-sm);
}

.category-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-slate-900);
  margin: 0;
  text-transform: capitalize;
}

.category-count {
  background: var(--color-marine-100);
  color: var(--color-marine-800);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  margin-left: auto;
}

.memory-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-height: clamp(18rem, 55vh, 30rem);
  overflow: auto;
  scrollbar-gutter: stable;
}

.memory-item {
  padding: var(--space-3);
  background: white;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  color: var(--color-slate-700);
  border: 1px solid var(--color-slate-200);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-xs);
}

.memory-item:hover {
  background: var(--color-marine-50);
  border-color: var(--color-marine-300);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.empty-state {
  text-align: left;
  padding: var(--space-6);
  color: var(--color-slate-700);
  background: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--color-marine-50);
  color: var(--color-slate-700);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-marine-100);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-marine-200);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-marine-700);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-slate-600);
}

/* Dark mode stat cards */
[data-theme="dark"] .stat-card {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.2);
  color: var(--color-slate-200);
}

[data-theme="dark"] .stat-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

[data-theme="dark"] .stat-number {
  color: #93c5fd;
}

[data-theme="dark"] .stat-label {
  color: var(--color-slate-400);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .nav-menu {
    gap: var(--space-3);
  }
  
  .card, .category-card {
    padding: var(--space-4);
    margin-bottom: var(--space-4);
  }
  
  .memory-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
  
  .table {
    font-size: 0.875rem;
  }
  
  .table th,
  .table td {
    padding: var(--space-3);
  }
}