/**
 * Podcast Directory Manager - Dark Theme Styles
 * Modern CSS with custom properties and responsive design
 */

/* CSS Custom Properties (Variables) */
:root {
  /* Color Palette */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-hover: #30363d;
  --bg-input: #0d1117;
  --bg-card: #161b22;
  --bg-modal: rgba(13, 17, 23, 0.95);
  
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #656d76;
  --text-link: #58a6ff;
  --text-link-hover: #79c0ff;
  
  --accent-primary: #238636;
  --accent-primary-hover: #2ea043;
  --accent-danger: #da3633;
  --accent-danger-hover: #f85149;
  --accent-warning: #d29922;
  --accent-info: #1f6feb;
  
  --border-primary: #30363d;
  --border-secondary: #21262d;
  --border-focus: #3d444d;
  --border-error: #f85149;
  --border-success: #2ea043;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  --font-heading: 'Oswald', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-xxl: 1.5rem;
  --font-size-xxxl: 2rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 6px;
  --border-radius-lg: 12px;
  --box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  --box-shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.24);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(88, 166, 255, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(35, 134, 54, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(218, 54, 51, 0.03) 0%, transparent 50%);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

h1 { font-size: var(--font-size-xxxl); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

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

a:hover, a:focus {
  color: var(--text-link-hover);
  text-decoration: underline;
}

/* Layout Components */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-xxl);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-heading);
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 1px;
}

.logo:hover {
  text-decoration: none;
  color: var(--accent-primary);
}

.logo-icon {
  font-size: 28px;
  color: var(--accent-primary);
  transition: all var(--transition-base);
}

.logo:hover .logo-icon {
  color: var(--accent-primary-hover);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  color: #ffffff;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-decoration: none !important;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-links a:hover {
  color: #ffffff;
  background-color: var(--bg-hover);
  text-decoration: none !important;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.nav-links a:focus {
  outline: none;
  text-decoration: none !important;
}

.nav-links a:focus-visible {
  text-decoration: none !important;
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.nav-links a.active {
  color: #ffffff;
  background-color: var(--bg-hover);
  text-decoration: none !important;
  border-color: var(--accent-primary);
}

/* Main Content Area */
.main-content {
  min-height: calc(100vh - 200px);
  padding-bottom: var(--spacing-xxl);
}

.content-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.page-title {
  margin: 0;
  color: var(--text-primary);
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  margin: var(--spacing-sm) 0 0 0;
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--box-shadow);
  transition: all var(--transition-base);
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-secondary);
}

.card-title {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--text-primary);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.podcast-cover-wrapper {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.podcast-cover-clickable {
    cursor: pointer;
    transition: all var(--transition-base);
    display: block;
}

.play-icon-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius);
    opacity: 0.6;
    transition: all var(--transition-base);
    pointer-events: none;
}

.play-icon-overlay i {
    font-size: 2rem;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
    transition: all var(--transition-base);
}

.podcast-cover-wrapper:hover .play-icon-overlay {
    background: rgba(35, 134, 54, 0.85);
    opacity: 1;
}

.podcast-cover-wrapper:hover .play-icon-overlay i {
    transform: scale(1.2);
}

.podcast-cover-wrapper:hover .podcast-cover-clickable {
    transform: scale(1.05);
}

.podcast-cover-wrapper:hover {
    filter: drop-shadow(0 4px 12px rgba(35, 134, 54, 0.4));
}

.btn-primary {
  color: white;
  background-color: var(--accent-primary);
  border-color: transparent;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-primary-hover);
  border-color: transparent;
  color: white;
  text-decoration: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: var(--accent-danger-hover);
  border-color: var(--accent-danger-hover);
  color: white;
  text-decoration: none;
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-hover);
  border-color: var(--border-focus);
  color: var(--text-primary);
  text-decoration: none;
}

.btn-outline {
  color: #c9d1d9;
  background-color: transparent;
  border-color: var(--border-primary);
}

.btn-outline:hover:not(:disabled) {
  color: var(--text-primary);
  background-color: var(--bg-hover);
  border-color: var(--border-focus);
  text-decoration: none;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-label.required::after {
  content: ' *';
  color: var(--accent-danger);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-input);
  background-clip: padding-box;
  border: 1px solid var(--border-primary);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.12);
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

.form-control:disabled {
  background-color: var(--bg-tertiary);
  opacity: 0.6;
  cursor: not-allowed;
}

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

.form-control.is-invalid {
  border-color: var(--border-error);
}

.form-control.is-invalid:focus {
  border-color: var(--border-error);
  box-shadow: 0 0 0 3px rgba(248, 81, 73, 0.12);
}

.form-control.is-valid {
  border-color: var(--border-success);
}

.form-control.is-valid:focus {
  border-color: var(--border-success);
  box-shadow: 0 0 0 3px rgba(46, 160, 67, 0.12);
}

/* File Input Styling */
.file-input-wrapper {
  position: relative;
  display: inline-block;
  cursor: pointer;
  width: 100%;
}

.file-input {
  position: absolute;
  left: -9999px;
  opacity: 0;
}

.file-input-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-xl);
  border: 2px dashed var(--border-primary);
  border-radius: var(--border-radius-lg);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 500;
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

.file-input-label:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.file-input-label.dragover {
  border-color: var(--accent-primary);
  background-color: rgba(35, 134, 54, 0.1);
  color: var(--accent-primary);
}

.file-input-preview {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-secondary);
}

.file-preview-image {
  max-width: 200px;
  max-height: 200px;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-sm);
}

/* Help Text */
.form-text {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.invalid-feedback {
  display: block;
  width: 100%;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--accent-danger);
}

.valid-feedback {
  display: block;
  width: 100%;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--accent-primary);
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 calc(-1 * var(--spacing-md));
}

.col {
  flex: 1;
  padding: 0 var(--spacing-md);
}

.col-auto {
  flex: 0 0 auto;
  padding: 0 var(--spacing-md);
}

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

.text-muted { color: var(--text-muted); }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--accent-primary); }
.text-danger { color: var(--accent-danger); }
.text-warning { color: var(--accent-warning); }
.text-info { color: var(--accent-info); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }

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

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border-primary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 1200px) {
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .nav-links a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
  }
  
  .nav-links a i {
    font-size: 0.85rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  
  .nav-links {
    justify-content: center;
    gap: var(--spacing-xs);
  }
  
  .nav-links a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }
  
  .content-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .card-actions {
    margin-left: 0;
    margin-top: var(--spacing-sm);
  }
  
  .btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .row {
    margin: 0;
  }
  
  .col {
    padding: 0;
    margin-bottom: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .card-actions {
    width: 100%;
    flex-direction: column;
  }
}