/* ====================================
   CSS Custom Properties & Root Config
   ==================================== */
:root {
  /* Color System */
  --bg-primary: #0f172a;
  --bg-secondary: #0b1222;
  --bg-card: #111827;
  --bg-card-hover: #1e293b;
  
  --text-primary: #e5e7eb;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-cyan: #22d3ee;
  --accent-blue: #60a5fa;
  --accent-purple: #a78bfa;
  
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --border: #1f2937;
  --border-focus: var(--accent-cyan);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #22d3ee 0%, #60a5fa 50%, #a78bfa 100%);
  --gradient-bg: linear-gradient(160deg, #0b1222 0%, #0f172a 100%);
  --gradient-card: linear-gradient(180deg, rgba(17, 24, 39, 0.9), rgba(17, 24, 39, 0.75));
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px rgba(34, 211, 238, 0.2);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
  --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Typography */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Monaco, "Cascadia Mono", "Courier New", monospace;
  
  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 400;
  --z-toast: 500;
  --z-cursor: 600;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background: var(--gradient-bg);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ====================================
   Custom Cursor
   ==================================== */
.custom-cursor,
.custom-cursor-dot {
  position: fixed;
  pointer-events: none;
  z-index: var(--z-cursor);
  transition: transform 0.15s ease, opacity 0.3s ease;
}

.custom-cursor {
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent-cyan);
  border-radius: var(--radius-full);
  transform: translate(-50%, -50%);
  opacity: 0;
}

.custom-cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: var(--radius-full);
  transform: translate(-50%, -50%);
  opacity: 0;
}

body:hover .custom-cursor,
body:hover .custom-cursor-dot {
  opacity: 1;
}

.custom-cursor.hover {
  transform: translate(-50%, -50%) scale(1.5);
  background: rgba(34, 211, 238, 0.1);
}

/* ====================================
   Header & Navigation
   ==================================== */
.app-header {
  position: sticky;
  top: 0;
  backdrop-filter: saturate(120%) blur(20px);
  background: rgba(15, 23, 42, 0.7);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-sticky);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  transition: all var(--transition-base);
}

.app-header.scrolled {
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.logo-icon {
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.3));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.5px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  margin: var(--spacing-xs) 0 0;
  color: var(--text-secondary);
  font-size: clamp(0.875rem, 2vw, 1rem);
}

/* Scroll Progress Indicator */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.1s linear;
}

/* ====================================
   Hero Section
   ==================================== */
.hero-section {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.05) 0%, transparent 70%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
  position: relative;
  z-index: var(--z-base);
}

.hero-title {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -1px;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.gradient-text::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  opacity: 0.5;
}

.hero-description {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.7;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.stat-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.stat-value {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

/* ====================================
   Features Section
   ==================================== */
.features-section {
  padding: var(--spacing-2xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(34, 211, 238, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  color: var(--accent-cyan);
  transition: all var(--transition-base);
}

.feature-card:hover .feature-icon {
  background: rgba(34, 211, 238, 0.2);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ====================================
   Container & Cards
   ==================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  gap: var(--spacing-xl);
}

.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(34, 211, 238, 0.3);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-header {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: rgba(0, 0, 0, 0.2);
}

.card-header h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  flex: 1;
}

.header-badge {
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.card-body {
  padding: var(--spacing-xl);
}

/* ====================================
   Forms
   ==================================== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto auto;
  gap: var(--spacing-md);
  align-items: end;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-field label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.form-field input[type="text"] {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-field input[type="text"]:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
  background: var(--bg-primary);
}

.form-field input[type="text"]:hover {
  border-color: rgba(148, 163, 184, 0.4);
}

.checkbox-field {
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-md);
  padding-bottom: 2px;
}

.checkbox-field input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.form-actions,
.actions-grid {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

/* ====================================
   Buttons
   ==================================== */
.btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: rgba(148, 163, 184, 0.5);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
}

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

.btn.primary {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.2), rgba(96, 165, 250, 0.2));
  border-color: rgba(34, 211, 238, 0.5);
  color: var(--accent-cyan);
  font-weight: 600;
}

.btn.primary:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.btn.danger {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

.btn.danger:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--danger);
}

.btn.ok {
  background: rgba(34, 197, 94, 0.15);
  border-color: rgba(34, 197, 94, 0.4);
  color: #86efac;
}

.btn.ok:hover {
  background: rgba(34, 197, 94, 0.25);
  border-color: var(--success);
}

/* Icon Button */
.icon-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.icon-btn:hover {
  border-color: rgba(148, 163, 184, 0.5);
  transform: translateY(-1px);
  background: var(--bg-card-hover);
}

/* ====================================
   Table
   ==================================== */
.table-wrap {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 640px;
}

.table thead th {
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 16px;
  border-bottom: 2px solid var(--border);
  z-index: 10;
}

.table tbody td {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  transition: background var(--transition-fast);
}

.table tbody tr:hover td {
  background: rgba(148, 163, 184, 0.05);
}

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

.col-order {
  width: 120px;
}

.col-actions {
  width: 280px;
}

.row-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Link Styles */
.link-title a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.link-title a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.url-mono {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-size: 0.875rem;
  overflow-wrap: anywhere;
  opacity: 0.8;
}

/* Placeholder Styles */
.placeholder-row td {
  background: rgba(148, 163, 184, 0.08);
  font-weight: 600;
}

.placeholder-chip {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(148, 163, 184, 0.2);
  color: var(--text-secondary);
  border: 1px dashed rgba(148, 163, 184, 0.4);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Editing State */
.editing input[type="text"] {
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

/* Loading & Empty States */
.loading-state,
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(34, 211, 238, 0.1);
  border-top-color: var(--accent-cyan);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

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

.empty-state svg {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.empty-state p {
  margin-bottom: var(--spacing-sm);
}

/* ====================================
   Testimonial Section
   ==================================== */
.testimonial-section {
  padding: var(--spacing-2xl) 0;
}

.testimonial-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.quote-icon {
  font-size: 4rem;
  color: var(--accent-cyan);
  opacity: 0.2;
  line-height: 1;
  position: absolute;
  top: 20px;
  left: 30px;
}

.testimonial-text {
  font-size: 1.25rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.author-name {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.author-role {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ====================================
   Footer
   ==================================== */
.app-footer {
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: var(--spacing-2xl);
  background: rgba(0, 0, 0, 0.2);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links {
  margin-top: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

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

/* ====================================
   Toast Notifications
   ==================================== */
.toast {
  position: fixed;
  right: var(--spacing-md);
  bottom: var(--spacing-md);
  min-width: 200px;
  max-width: 400px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
  pointer-events: none;
  z-index: var(--z-toast);
  font-weight: 500;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.toast.ok {
  border-color: rgba(34, 197, 94, 0.5);
  background: rgba(34, 197, 94, 0.1);
  color: #86efac;
}

.toast.err {
  border-color: rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.1);
  color: #fca5a5;
}

/* ====================================
   Utility Classes
   ==================================== */
.hidden {
  display: none !important;
}

.hint {
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
  font-size: 0.9rem;
  line-height: 1.6;
}

.icon {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  flex-shrink: 0;
}

/* Hover Effects */
.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Scroll Animations */
.reveal-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.fade-in-delay {
  animation: fadeIn 0.8s ease 0.2s forwards;
  opacity: 0;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .col-actions {
    width: 240px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  :root {
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
  }
  
  .card-header,
  .card-body {
    padding: var(--spacing-md);
  }
  
  .table-wrap {
    font-size: 0.875rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .actions-grid {
    grid-template-columns: 1fr;
  }
  
  .custom-cursor,
  .custom-cursor-dot {
    display: none;
  }
}

/* ====================================
   Print Styles
   ==================================== */
@media print {
  .app-header,
  .app-footer,
  .card-header,
  .form-grid,
  .actions-grid,
  .col-actions,
  .toast {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}

/* ====================================
   Accessibility
   ==================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Visible Styles */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --border: #ffffff;
    --text-secondary: #ffffff;
  }
}