/* ==========================================================================
   Base Styles and Variables
   ========================================================================== */

:root {
  /* Colors - Dark Theme (Default) */
  --color-primary: #00b4d8;
  --color-primary-dark: #0096c7;
  --color-secondary: #4361ee;
  --color-accent: #f72585;
  --color-text: #f8f9fa;
  --color-text-light: #e9ecef;
  --color-text-lighter: #ced4da;
  --color-bg: #0f172a;
  --color-bg-light: #1e293b;
  --color-bg-dark: #0f172a;
  --color-bg-card: rgba(30, 41, 59, 0.7);
  --color-bg-card-hover: rgba(30, 41, 59, 0.9);
  --color-border: #334155;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Glassmorphism */
  --glass-bg: rgba(15, 23, 42, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
  --glass-blur: 10px;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00b4d8 0%, #4361ee 100%);
  --gradient-secondary: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
  --gradient-accent: linear-gradient(135deg, #f72585 0%, #7209b7 100%);
  
  /* Shadows */
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px 0 rgba(0, 0, 0, 0.3), 0 2px 4px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 6px 10px -1px rgba(0, 0, 0, 0.3), 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 15px 20px -3px rgba(0, 0, 0, 0.3), 0 8px 12px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 25px 30px -5px rgba(0, 0, 0, 0.3), 0 15px 15px -5px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 15px rgba(0, 180, 216, 0.5);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  
  /* Border Radius */
  --rounded-sm: 0.25rem;
  --rounded: 0.375rem;
  --rounded-md: 0.5rem;
  --rounded-lg: 0.75rem;
  --rounded-xl: 1rem;
  --rounded-2xl: 1.5rem;
  --rounded-full: 9999px;
  
  /* Transitions */
  --transition: all 0.3s ease-in-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle at 50% 0%, #1e3a8a 0%, #0f172a 70%);
  background-attachment: fixed;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

/* Ensure all lists have no bullets by default */
ul, ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

a:hover {
  color: var(--color-primary-dark);
  text-shadow: 0 0 8px rgba(0, 180, 216, 0.5);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: var(--rounded-md);
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
  gap: 0.5rem;
}

.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.125rem;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn-ghost:hover {
  background-color: var(--color-bg-dark);
  text-decoration: none;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--rounded-md);
  background-color: var(--color-bg-light);
  color: var(--color-text);
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(74, 134, 232, 0.2);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Header Styles */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.9) 0%, rgba(30, 58, 138, 0.8) 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.75rem 0;
  transition: var(--transition);
}

/* Cards */
.card {
  background-color: var(--color-bg-light);
  border-radius: var(--rounded-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
}

.card-body {
  padding: 1.25rem;
}

.card-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-dark);
}

/* Alerts */
.alert {
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: var(--rounded-md);
  border: 1px solid transparent;
}

.alert-success {
  background-color: #f0fff4;
  border-color: #9ae6b4;
  color: #2f855a;
}

.alert-error {
  background-color: #fff5f5;
  border-color: #feb2b2;
  color: #c53030;
}

.alert-warning {
  background-color: #fffaf0;
  border-color: #feebc8;
  color: #c05621;
}

.alert-info {
  background-color: #ebf8ff;
  border-color: #90cdf4;
  color: #2b6cb0;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-5 { margin-top: 1.25rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-10 { margin-top: 2.5rem; }
.mt-12 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-10 { margin-bottom: 2.5rem; }
.mb-12 { margin-bottom: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-2 {
  gap: 0.5rem;
}

.gap-4 {
  gap: 1rem;
}

.hidden {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
}