/* Design System - Avutap & Tevkilapp'tan ilham alınmıştır */

:root {
  /* Colors - Turkuaz & Amber palette */
  --primary: rgb(48, 105, 108);
  --primary-dark: rgb(35, 85, 88);
  --primary-light: rgb(58, 118, 121);
  --secondary: #F59E0B;
  --secondary-dark: #D97706;
  --secondary-light: #FBBF24;
  --accent: #FB923C;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* Neutrals */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', var(--font-sans);
  
  /* 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;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Semantic Colors (Light Mode Default) */
  --bg-body: #eceff1;
  --bg-card: #fafbfc;
  --bg-surface: #ffffff;
  --bg-input: #ffffff;
  --text-main: var(--gray-900);
  --text-muted: var(--gray-500);
  --border-color: rgba(0, 0, 0, 0.06);
  --border-input: var(--gray-300);
  --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: white;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: 1.125rem;
}

/* Cards - Katmanlı Beyaz Tonları */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: 0 2px 8px var(--shadow-color), 0 1px 2px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 8px 24px var(--shadow-color), 0 2px 6px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
  border-color: var(--primary);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

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

/* Typography */
.heading-xl {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.heading-lg {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
}

.heading-md {
  font-family: var(--font-display);
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.3;
}

.text-lg {
  font-size: 1.25rem;
  line-height: 1.75;
}

@media (max-width: 768px) {
  .heading-xl { font-size: 2.5rem; }
  .heading-lg { font-size: 2rem; }
  .heading-md { font-size: 1.5rem; }
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Icon */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-xl);
  color: white;
  font-size: 1.5rem;
}

/* ============================================
   FORM COMPONENTS
   ============================================ */

.form-group {
  margin-bottom: var(--space-6);
}

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--border-input);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  transition: all 0.2s ease;
  background: var(--bg-input);
  color: var(--text-main);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46, 129, 217, 0.1);
}

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

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

.form-help {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.form-error {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--danger);
}

.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.form-checkbox input,
.form-radio input {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
}

/* ============================================
   MODAL
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: var(--space-4);
}

.modal {
  background: var(--bg-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn 0.3s ease;
  border: 1px solid var(--border-color);
}

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

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: var(--space-6);
  color: var(--text-main);
}

.modal-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  display: flex;
  gap: var(--space-3);
  align-items: start;
}

.alert-success {
  background: #f0fdf4;
  border-color: var(--success);
  color: #166534;
}

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

.alert-danger {
  background: #fef2f2;
  border-color: var(--danger);
  color: #991b1b;
}

.alert-info {
  background: #eff6ff;
  border-color: var(--info);
  color: #1e40af;
}

.alert-icon {
  flex-shrink: 0;
  font-size: 1.25rem;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: 600;
  margin-bottom: var(--space-1);
}

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

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: var(--primary);
  color: white;
}

.badge-success {
  background: var(--success);
  color: white;
}

.badge-warning {
  background: var(--warning);
  color: white;
}

.badge-danger {
  background: var(--danger);
  color: white;
}

.badge-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

/* ============================================
   TABLES
   ============================================ */

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table thead {
  background: var(--bg-body);
}

.table th {
  padding: var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.table td {
  padding: var(--space-4);
  border-top: 1px solid var(--border-color);
  color: var(--text-main);
}

.table tbody tr:hover {
  background: var(--bg-body);
}

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

.spinner {
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  width: 2rem;
  height: 2rem;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

.spinner-lg {
  width: 3rem;
  height: 3rem;
  border-width: 4px;
}

/* ============================================
   AVATAR
   ============================================ */

.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gray-200);
  color: var(--gray-600);
  font-weight: 600;
  overflow: hidden;
}

.avatar-sm {
  width: 2rem;
  height: 2rem;
  font-size: 0.875rem;
}

.avatar-md {
  width: 3rem;
  height: 3rem;
  font-size: 1rem;
}

.avatar-lg {
  width: 4rem;
  height: 4rem;
  font-size: 1.25rem;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================
   UTILITIES
   ============================================ */

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

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: 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); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

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

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: 9999px; }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

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

.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--border-color) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
  display: inline-block;
}

.skeleton-text {
  height: 1em;
  width: 100%;
  margin-bottom: 0.5em;
}

.skeleton-circle {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
}

.skeleton-rect {
  width: 100%;
  height: 200px;
}

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

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

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 2px dashed var(--border-color);
}

.empty-state-icon {
  font-size: 4rem;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  color: var(--text-muted);
  max-width: 400px;
  margin: 0 auto var(--space-6);
}

/* ============================================
   MICRO INTERACTIONS
   ============================================ */

.btn:active {
  transform: scale(0.98);
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Focus Accessibility */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}