/* ============================================================
   MaxYTDL — Global Styles
   Premium Violet/Magenta HSL duet with a dark mystic canvas system
   ============================================================ */

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

/* CSS Variables — Design Tokens */
:root {
  --color-primary: #E8521A;      /* Orange */
  --color-accent: #f97316;       /* Light Orange */
  --color-bg: #f8fafc;           /* Light canvas */
  --color-bg-card: #ffffff;      /* Card bg */
  --color-bg-inset: #f1f5f9;     /* Inset bg */
  --color-border: #e2e8f0;       /* Fine border */
  --color-border-strong: #94a3b8;
  
  --color-text: #0f172a;         /* Deep slate */
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  
  --color-link: #E8521A;
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  
  --gradient-primary: linear-gradient(135deg, #E8521A 0%, #f97316 100%);
  --font-sans: 'Outfit', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.03);
  
  --container-max: 1200px;
}

/* Dark Theme Tokens */
.dark, [data-theme="dark"] {
  --color-bg: #070512;           /* Deep mystic purple-black */
  --color-bg-card: #0f0c24;      /* Card bg */
  --color-bg-inset: #181436;     /* Inset bg */
  --color-border: #211c4e;
  --color-border-strong: #3b3378;
  
  --color-text: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  
  --color-link: #f97316;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 10px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 25px rgba(0,0,0,0.5);
}

/* Base styling */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}
a:hover {
  opacity: 0.8;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
}
h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}
h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px stroke var(--color-border);
  padding: var(--space-md) 0;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.dark .nav {
  background: rgba(7, 5, 18, 0.85);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
}
.nav-links {
  display: flex;
  gap: var(--space-lg);
  font-weight: 500;
}
.nav-links a {
  color: var(--color-text-secondary);
}
.nav-links a:hover {
  color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  gap: var(--space-xs);
}
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}
.btn-secondary {
  background: var(--color-bg-inset);
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-secondary:hover {
  background: var(--color-border);
}
.btn-danger {
  background: var(--color-error);
  color: white;
}
.btn-danger:hover {
  background: #dc2626;
}
.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* Card */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

/* Hero Section */
.hero-section {
  padding: var(--space-2xl) 0;
  text-align: center;
}
.hero-title {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-md);
  font-weight: 900;
}
.hero-subtitle {
  max-width: 600px;
  margin: 0 auto var(--space-xl) auto;
  font-size: 1.15rem;
}

/* Downloader Area */
.downloader-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}
@media (max-width: 900px) {
  .downloader-grid {
    grid-template-columns: 1fr;
  }
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-xs);
}
.tab-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.tab-btn.active {
  background: var(--color-bg-inset);
  color: var(--color-primary);
}

/* Inputs & Form Controls */
.form-group {
  margin-bottom: var(--space-md);
}
.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--space-xxs);
  color: var(--color-text-secondary);
}
.input-row {
  display: flex;
  gap: var(--space-xs);
}
input[type="text"], select {
  flex: 1;
  background: var(--color-bg-inset);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 12px var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}
input[type="text"]:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

/* Preview Section */
.preview-box {
  margin-top: var(--space-lg);
  background: var(--color-bg-inset);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}
.video-list {
  max-height: 250px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.video-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--color-bg-card);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}
.video-item-info {
  display: flex;
  flex-direction: column;
}
.video-item-title {
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.video-item-meta {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* Active Jobs & History */
.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.job-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.job-card {
  background: var(--color-bg-inset);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.job-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-xs);
  gap: var(--space-xs);
}
.job-title {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.job-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}
.status-downloading { background: rgba(245, 158, 11, 0.15); color: var(--color-warning); }
.status-merging { background: rgba(139, 92, 246, 0.15); color: var(--color-primary); }
.status-done { background: rgba(16, 185, 129, 0.15); color: var(--color-success); }
.status-failed { background: rgba(239, 68, 68, 0.15); color: var(--color-error); }
.status-cancelled { background: rgba(100, 116, 139, 0.15); color: var(--color-text-muted); }

.progress-track {
  background: var(--color-border);
  height: 6px;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-xs);
}
.progress-fill {
  background: var(--gradient-primary);
  height: 100%;
  width: 0;
  transition: width 0.3s ease;
}
.job-details {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* History Box */
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-height: 400px;
  overflow-y: auto;
}
.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}
.history-info {
  display: flex;
  flex-direction: column;
  max-width: 70%;
}
.history-title {
  font-size: 0.9rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.history-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.history-actions {
  display: flex;
  gap: var(--space-xs);
}

/* How It Works & Features */
.info-section {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}
.info-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
}
.steps-grid, .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}
.step-card, .feature-card {
  text-align: center;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.step-num {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: white;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md) auto;
}
.feature-icon {
  font-size: 2.25rem;
  margin-bottom: var(--space-md);
}

/* Footer */
.footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-lg) 0;
  margin-top: var(--space-2xl);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}
@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.footer-tagline {
  max-width: 320px;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.footer-col h4 {
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}
.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Loader */
.loader-spinner {
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin: 10px auto;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

/* Responsive Nav styling */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

@media (max-width: 900px) {
  .nav-inner {
    display: grid;
    grid-template-columns: 1fr auto; /* Logo on left, Actions on right */
    align-items: center;
    gap: 16px;
  }
  .nav-links {
    grid-column: 1 / -1; /* Links span full width below logo/actions */
    display: flex;
    justify-content: center;
    margin-top: 8px;
    border-top: 1px solid var(--color-border);
    padding-top: 12px;
    gap: 20px;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .nav-inner {
    grid-template-columns: auto auto; /* side-by-side logo and actions */
    gap: 8px;
  }
  .nav-logo span {
    font-size: 1.1rem; /* slightly smaller logo text on narrow screens */
  }
  .nav-actions .btn {
    padding: 6px 10px; /* smaller button padding on narrow screens */
    font-size: 0.8rem;
  }
}

/* Dynamic format button micro-animations */
.format-btn {
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}
.format-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(232, 82, 26, 0.2);
}
.format-btn:active {
  transform: translateY(1px) scale(0.95);
}
.format-btn.active,
.format-btn.active:hover {
  background: var(--gradient-primary) !important;
  color: white !important;
  border-color: transparent !important;
  transform: scale(1.08) !important;
  box-shadow: 0 6px 15px rgba(232, 82, 26, 0.4) !important;
  font-weight: 700;
  animation: buttonPulse 0.4s ease-out;
}
@keyframes buttonPulse {
  0% { box-shadow: 0 0 0 0 rgba(232, 82, 26, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(232, 82, 26, 0); }
  100% { box-shadow: 0 0 0 0 rgba(232, 82, 26, 0); }
}

/* Multi-Select Asset Picker Grid */
.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: var(--space-md);
}

.asset-card {
  background: var(--color-bg-inset);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
}

.asset-card:hover {
  border-color: rgba(232, 82, 26, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(232, 82, 26, 0.15);
}

.asset-card:has(input:checked) {
  border-color: var(--color-primary);
  background: rgba(232, 82, 26, 0.08);
  box-shadow: 0 0 0 1px var(--color-primary), 0 4px 12px rgba(232, 82, 26, 0.2);
}

.asset-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
}

.asset-check input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.asset-check-label {
  color: var(--color-text);
}

.asset-desc {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 6px;
  margin-bottom: 0;
}

@media (max-width: 480px) {
  .asset-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .asset-card {
    padding: 10px;
  }
}

/* Premium Warning Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  background: rgba(7, 5, 18, 0.65);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.modal-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: modalBounce 0.5s ease-out;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.modal-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

@keyframes modalBounce {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.1); }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}