/* ==================== RESET & VARIABLES ==================== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --accent: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --info: #06b6d4;
  
  --bg-dark: #0f172a;
  --bg-darker: #0a0e27;
  --bg-card: #1e293b;
  --bg-hover: #334155;
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --border-color: #334155;
  --border-light: #475569;
  
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.4);
  
  --radius: 12px;
  --radius-lg: 16px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
  color: var(--text-primary);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

/* ==================== RESPONSIVE CONTAINER ==================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.container-sm {
  max-width: 500px;
  margin: 0 auto;
  padding: 24px;
}

/* ==================== HEADER ==================== */
header {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.nav-items {
  display: flex;
  gap: 24px;
  align-items: center;
}

@media (max-width: 768px) {
  .nav-items { gap: 12px; }
  .header-content { padding: 12px 16px; }
}

/* ==================== BUTTONS ==================== */
button, .btn {
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  padding: 10px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-light);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--text-primary);
  color: var(--text-primary);
}

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

.btn-success:hover {
  background: var(--secondary-dark);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}

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

.btn-danger:hover {
  background: #dc2626;
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==================== CARDS ==================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 20px;
  font-weight: 700;
}

.card-body {
  padding: 0;
}

.card-footer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* ==================== PRICING CARDS ==================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.pricing-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 24px rgba(99, 102, 241, 0.2);
  transform: scale(1.05);
}

.pricing-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-8px);
}

.pricing-badge {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.pricing-title {
  font-size: 20px;
  font-weight: 700;
  margin: 12px 0;
}

.pricing-price {
  font-size: 44px;
  font-weight: 700;
  color: var(--primary);
  margin: 16px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-period {
  font-size: 14px;
  color: var(--text-muted);
}

.pricing-description {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 14px;
  flex-grow: 1;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin: 24px 0;
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.pricing-features li {
  padding: 8px 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.pricing-features li:before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
}

.pricing-button {
  width: 100%;
  margin-top: auto;
  padding: 12px;
}

/* ==================== FORMS ==================== */
form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

input, textarea, select {
  background: var(--bg-darker);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--text-primary);
  font-size: 14px;
  transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

input::placeholder {
  color: var(--text-muted);
}

textarea {
  resize: vertical;
  min-height: 120px;
  font-family: inherit;
}

/* ==================== MODALS ==================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* ==================== ALERTS & MESSAGES ==================== */
.alert {
  padding: 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #86efac;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-info {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fcd34d;
}

/* ==================== BADGE & TAGS ==================== */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
}

.badge-success {
  background: rgba(16, 185, 129, 0.2);
  color: #86efac;
}

.badge-danger {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

/* ==================== GRID & LAYOUT ==================== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.flex {
  display: flex;
  gap: 16px;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* ==================== TEXT UTILITIES ==================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
}

h1 { font-size: 36px; }
h2 { font-size: 28px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

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

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

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

.slide-in-left {
  animation: slideInLeft 0.3s ease-out;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }
  
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: scale(1);
  }
  
  .modal-content {
    padding: 24px;
  }
}

/* ==================== UTILITY CLASSES ==================== */
.hidden { display: none; }
.visible { display: block; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}