/**
 * Modern CSS Design System for Audio Streaming Platform
 * Dark mode with glassmorphism, vibrant gradients, and smooth animations
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Color Palette - HSL for easy manipulation */
  --primary-hue: 260;
  --primary-sat: 85%;
  --primary-light: 60%;
  
  --bg-dark: hsl(240, 15%, 8%);
  --bg-card: hsl(240, 12%, 12%);
  --bg-card-hover: hsl(240, 12%, 15%);
  
  --text-primary: hsl(0, 0%, 95%);
  --text-secondary: hsl(0, 0%, 70%);
  --text-muted: hsl(0, 0%, 50%);
  
  --accent-1: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
  --accent-2: hsl(180, 85%, 55%);
  --accent-3: hsl(320, 85%, 60%);
  
  --success: hsl(140, 70%, 55%);
  --warning: hsl(40, 90%, 60%);
  --error: hsl(0, 75%, 60%);
  
  --border-color: hsl(240, 10%, 20%);
  --border-radius: 12px;
  --border-radius-lg: 16px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image: 
    radial-gradient(at 20% 30%, hsla(var(--primary-hue), 70%, 30%, 0.15) 0px, transparent 50%),
    radial-gradient(at 80% 70%, hsla(180, 70%, 30%, 0.15) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Glass Card */
.card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.card:hover {
  background: rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

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

.btn-danger:hover {
  background: hsl(0, 75%, 50%);
  box-shadow: 0 4px 20px hsla(0, 75%, 60%, 0.4);
}

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

.btn-success:hover {
  background: hsl(140, 70%, 45%);
  box-shadow: 0 4px 20px hsla(140, 70%, 55%, 0.4);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-1);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* Table */
.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background: rgba(255, 255, 255, 0.05);
}

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
}

tr {
  transition: var(--transition);
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.badge-success {
  background: hsla(140, 70%, 55%, 0.2);
  color: var(--success);
  border: 1px solid var(--success);
}

.badge-danger {
  background: hsla(0, 75%, 60%, 0.2);
  color: var(--error);
  border: 1px solid var(--error);
}

.badge-warning {
  background: hsla(40, 90%, 60%, 0.2);
  color: var(--warning);
  border: 1px solid var(--warning);
}

.badge-info {
  background: hsla(180, 85%, 55%, 0.2);
  color: var(--accent-2);
  border: 1px solid var(--accent-2);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

/* Grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Navbar */
.navbar {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-menu {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

/* Alert */
.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  border-left: 4px solid;
}

.alert-success {
  background: hsla(140, 70%, 55%, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.alert-error {
  background: hsla(0, 75%, 60%, 0.1);
  border-color: var(--error);
  color: var(--error);
}

.alert-warning {
  background: hsla(40, 90%, 60%, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

.alert-info {
  background: hsla(180, 85%, 55%, 0.1);
  border-color: var(--accent-2);
  color: var(--accent-2);
}

/* Drag and Drop */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  padding: 3rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent-1);
  background: rgba(255, 255, 255, 0.05);
}

.dropzone-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.flex { display: flex; }
.flex-column { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

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

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .navbar {
    padding: 1rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}