/* Design System Tokens */
:root {
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Dark Mode Variables (Default) */
  --bg-gradient: radial-gradient(circle at 0% 0%, #0f1026 0%, #090d1a 50%, #02040a 100%);
  --panel-bg: rgba(13, 17, 30, 0.65);
  --panel-border: rgba(255, 255, 255, 0.06);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --primary-accent: #6366f1;
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --primary-glow: rgba(99, 102, 241, 0.35);
  --success-color: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.2);
  --error-color: #ef4444;
  --input-bg: rgba(2, 6, 18, 0.45);
  --input-border: rgba(255, 255, 255, 0.08);
  --card-sub-bg: rgba(255, 255, 255, 0.015);
  --shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.45);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-gradient: radial-gradient(circle at 0% 0%, #e0e7ff 0%, #f8fafc 60%, #e2e8f0 100%);
  --panel-bg: rgba(255, 255, 255, 0.75);
  --panel-border: rgba(0, 0, 0, 0.05);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --primary-accent: #4f46e5;
  --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
  --primary-glow: rgba(79, 70, 229, 0.2);
  --success-color: #16a34a;
  --success-glow: rgba(22, 163, 74, 0.15);
  --error-color: #dc2626;
  --input-bg: rgba(255, 255, 255, 0.85);
  --input-border: rgba(0, 0, 0, 0.08);
  --card-sub-bg: rgba(0, 0, 0, 0.015);
  --shadow: 0 24px 48px -12px rgba(15, 23, 42, 0.06);
}

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

body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  padding: 20px;
  transition: background 0.5s ease;
  position: relative;
}

/* Background glows */
.glow-bg-1, .glow-bg-2 {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(130px);
  z-index: 1;
  opacity: 0.12;
  pointer-events: none;
  transition: var(--transition);
}

.glow-bg-1 {
  top: -10%;
  left: -10%;
  background: var(--primary-accent);
}

.glow-bg-2 {
  bottom: -10%;
  right: -10%;
  background: #a855f7;
}

[data-theme="light"] .glow-bg-1, 
[data-theme="light"] .glow-bg-2 {
  opacity: 0.08;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 600px;
  position: relative;
  z-index: 10;
}

/* Header Section */
header {
  text-align: center;
  margin-bottom: 28px;
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-svg {
  width: 32px;
  height: 32px;
  color: var(--primary-accent);
  filter: drop-shadow(0 2px 8px var(--primary-glow));
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 5px;
  line-height: 1.4;
}

/* Glassmorphism Panel */
.panel {
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

/* Input Styles */
.form-group {
  margin-bottom: 18px;
}

.input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 18px;
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
  transition: var(--transition);
}

input[type="url"], input[type="text"] {
  width: 100%;
  padding: 16px 110px 16px 48px;
  border-radius: 16px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

input:focus {
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

input:focus + .input-icon {
  color: var(--primary-accent);
}

/* Inside-input buttons */
.input-actions {
  position: absolute;
  right: 8px;
  display: flex;
  gap: 6px;
}

.btn-inline {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  transition: var(--transition);
}

.btn-inline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

[data-theme="light"] .btn-inline {
  background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .btn-inline:hover {
  background: rgba(0, 0, 0, 0.08);
}

/* Primary Button */
.btn-primary {
  width: 100%;
  padding: 16px;
  border-radius: 16px;
  border: none;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 8px 20px -6px var(--primary-glow);
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -4px var(--primary-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Loader Animation */
.spinner {
  animation: rotate 1.5s linear infinite;
  font-size: 1.1rem;
}

@keyframes rotate {
  100% { transform: rotate(360deg); }
}

/* Error Alert */
.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  padding: 14px 18px;
  border-radius: 14px;
  margin-top: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  animation: slideIn 0.3s ease-out;
}

[data-theme="light"] .alert-error {
  color: #991b1b;
  background: rgba(239, 68, 68, 0.06);
}

/* Results Display Panel */
.results-card {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--panel-border);
  animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.results-card.hidden {
  display: none;
}

.file-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.file-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--card-sub-bg);
  border: 1px solid var(--panel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--primary-accent);
}

.file-title {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  word-break: break-all;
}

.meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 22px;
}

.meta-item {
  background: var(--card-sub-bg);
  border: 1px solid var(--panel-border);
  padding: 12px 16px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.meta-val {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Result Actions */
.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-action {
  padding: 14px;
  border-radius: 14px;
  border: none;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
  text-decoration: none;
}

.btn-action.download {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-action.download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px var(--primary-glow);
}

.btn-action.secondary {
  background: var(--card-sub-bg);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
}

.btn-action.secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-muted);
}

[data-theme="light"] .btn-action.secondary:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow);
  color: var(--text-primary);
  font-size: 1.1rem;
  transition: var(--transition);
  z-index: 100;
}

.theme-toggle:hover {
  transform: scale(1.05);
  border-color: var(--primary-accent);
}

/* Footer Info */
footer {
  text-align: center;
  margin-top: 28px;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Accessibility hidden elements */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Animations */
@keyframes slideIn {
  0% {
    opacity: 0;
    transform: translateY(12px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile Responsive Adjustments */
@media (max-width: 480px) {
  .panel {
    padding: 20px;
  }
  
  .meta-grid {
    grid-template-columns: 1fr;
  }
  
  .action-row {
    grid-template-columns: 1fr;
  }
  
  input[type="url"], input[type="text"] {
    padding-right: 90px;
  }
}