:root {
  --bg-color: #0c0a09;
  --bg-gradient: radial-gradient(circle at 50% 0%, #1e1b18 0%, #0c0a09 100%);
  --card-bg: rgba(28, 25, 23, 0.65);
  --card-border: rgba(214, 186, 137, 0.12);
  --text-main: #f5f5f4;
  --text-muted: #a8a29e;
  --accent-color: #d6ba89;
  --accent-glow: rgba(214, 186, 137, 0.25);
  --accent-hover: #e5d5be;
  --success-color: #34d399;
  --success-glow: rgba(52, 211, 153, 0.2);
  --danger-color: #f87171;
  --input-bg: #171412;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  color: var(--text-main);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Scrollbar Style */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: #292524;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #3f3f46;
}

.app-container {
  width: 100%;
  max-width: 680px;
  padding: 40px 20px;
  animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--text-main);
  text-shadow: 0 0 20px var(--accent-glow);
  margin-bottom: 8px;
  display: inline-block;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 400;
}

/* Main Card */
.main-card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 28px;
  padding: 40px;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
}

.main-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed rgba(214, 186, 137, 0.25);
  border-radius: 20px;
  padding: 44px 20px;
  text-align: center;
  cursor: pointer;
  position: relative;
  background: rgba(23, 20, 18, 0.3);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  margin-bottom: 30px;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent-color);
  background: rgba(214, 186, 137, 0.05);
  box-shadow: 0 0 30px rgba(214, 186, 137, 0.03) inset;
  transform: translateY(-2px);
}

.upload-zone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 10;
}

.upload-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  color: var(--accent-color);
  opacity: 0.85;
  transition: transform 0.3s ease;
}

.upload-zone:hover .upload-icon {
  transform: translateY(-4px);
}

.upload-text {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.upload-text .highlight {
  color: var(--accent-color);
  text-decoration: underline;
}

.upload-subtext {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.selected-file-name {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  background: rgba(214, 186, 137, 0.1);
  color: var(--accent-color);
  padding: 5px 12px;
  border-radius: 20px;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.3s ease;
}

.selected-file-name.visible {
  opacity: 1;
  transform: scale(1);
}

/* Action Button */
.action-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-color) 0%, #b59868 100%);
  color: #1c1917;
  border: none;
  padding: 16px 24px;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(214, 186, 137, 0.2);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(214, 186, 137, 0.35);
  background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-color) 100%);
}

.action-btn:active {
  transform: translateY(1px);
}

.action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Loading / Status Container */
.status-container {
  text-align: center;
  padding: 30px 10px 10px;
}

.status-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 6px;
}

.status-detail {
  font-size: 14px;
  color: var(--text-muted);
}

/* Loading Spinner */
.spinner {
  width: 50px;
  height: 50px;
  position: relative;
  margin: 0 auto;
}

.double-bounce1, .double-bounce2 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--accent-color);
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  animation: sk-bounce 2.0s infinite ease-in-out;
  box-shadow: 0 0 20px var(--accent-glow);
}

.double-bounce2 {
  animation-delay: -1.0s;
}

@keyframes sk-bounce {
  0%, 100% { 
    transform: scale(0.0);
  } 50% { 
    transform: scale(1.0);
  }
}

/* Success Container */
.success-container {
  text-align: center;
  padding: 20px 0 10px;
  animation: scaleIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.success-icon {
  width: 64px;
  height: 64px;
  background: var(--success-glow);
  border: 1px solid rgba(52, 211, 153, 0.3);
  color: var(--success-color);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto 20px;
  box-shadow: 0 0 30px var(--success-glow);
}

.success-icon svg {
  width: 32px;
  height: 32px;
}

.success-title {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.success-subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.download-btn {
  background: linear-gradient(135deg, var(--success-color) 0%, #10b981 100%);
  color: #0c0a09;
  border: none;
  padding: 16px 28px;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 30px var(--success-glow);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  flex-grow: 1;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(52, 211, 153, 0.4);
  background: linear-gradient(135deg, #6ee7b7 0%, var(--success-color) 100%);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  padding: 16px 24px;
  border-radius: 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.success-container .actions {
  display: flex;
  gap: 14px;
  margin-bottom: 30px;
}

/* Collapsible Preview */
.preview-details {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 6px 14px;
  text-align: left;
}

.preview-details summary {
  padding: 8px 0;
  font-size: 14px;
  color: var(--accent-color);
  cursor: pointer;
  font-weight: 600;
  outline: none;
  user-select: none;
}

.preview-details textarea {
  width: 100%;
  height: 180px;
  background: #080706;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  padding: 12px;
  margin: 8px 0;
  outline: none;
  resize: vertical;
}

/* Advanced Settings Accordion */
.advanced-accordion {
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 20px;
  text-align: left;
}

.advanced-accordion summary {
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 600;
  outline: none;
  user-select: none;
  display: inline-block;
}

.advanced-accordion summary:hover {
  color: var(--accent-color);
}

.accordion-content {
  padding: 16px 4px 4px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.form-label input {
  width: 100%;
  margin-top: 8px;
  background: var(--input-bg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--text-main);
  outline: none;
  font-family: var(--font-body);
  transition: all 0.3s ease;
}

.form-label input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(214, 186, 137, 0.12);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 580px) {
  .main-card {
    padding: 24px;
  }
  .grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .success-container .actions {
    flex-direction: column;
  }
}