/* ── CSS Custom Properties (Glassmorphism Theme) ── */
:root {
  --bg-page: linear-gradient(135deg, #0c0c0c 0%, #18181b 100%);
  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-bg-hover: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-strong: rgba(255, 255, 255, 0.14);
  --accent: #f59e0b;
  --accent-soft: #fb923c;
  --accent-glow: rgba(245, 158, 11, 0.25);
  --accent-bg: rgba(245, 158, 11, 0.08);
  --text-primary: #fafafa;
  --text-secondary: rgba(255, 255, 255, 0.60);
  --text-muted: rgba(255, 255, 255, 0.40);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.25);
  --radius-lg: 1rem;
}

/* ── Glass Panel ── */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

@supports not (backdrop-filter: blur(20px)) {
  .glass-panel {
    background: rgba(30, 30, 30, 0.95);
  }

  .upload-card {
    background: rgba(30, 30, 30, 0.95);
  }
}

/* ── Reset ── */
* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-page);
  background-attachment: fixed;
  color: var(--text-primary);
}

/* ── Page Layout ── */
.app {
  min-height: 100vh;
}

.main {
  padding: 24px 28px;
}

/* ── Top Bar ── */
.top-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: stretch;
}

.top-bar .upload-section {
  margin-bottom: 0;
  flex: 1;
  min-width: 0;
  width: 50%;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  width: 50%;
  justify-content: flex-end;
}

.upload-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  height: 100%;
  padding: 14px 18px;
  border: 1px dashed var(--glass-border-strong);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  cursor: pointer;
  transition: all 0.2s ease;
}

.upload-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
}

.upload-card.drag-over {
  background: var(--accent-bg);
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}

.upload-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.upload-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
}

/* ── Format Selector & Action Buttons ── */
.format-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 9999px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.format-trigger:hover {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
}

.format-menu {
  background: rgba(20, 20, 20, 0.85) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.format-menu li a {
  border-radius: calc(var(--radius-lg) - 6px);
  transition: all 0.15s ease;
}

.format-menu li a:hover,
.format-menu li a.active {
  background: rgba(245, 158, 11, 0.12);
  border-left: 3px solid var(--accent);
}

.btn-convert {
  background: linear-gradient(135deg, var(--accent), var(--accent-soft)) !important;
  border: none !important;
  color: #1a0f00 !important;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.25);
  transition: all 0.2s ease;
}

.btn-convert:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
}

.btn-convert:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-download {
  background: transparent !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--text-primary) !important;
  transition: all 0.2s ease;
}

.btn-download:hover:not(:disabled) {
  background: var(--glass-bg-hover) !important;
  border-color: var(--accent) !important;
}

.error-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 9999px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #fca5a5;
  font-size: 12px;
  margin-top: 4px;
}

/* ── Preview Card ── */
.preview-card {
  padding: 18px;
}

.preview-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.preview-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0;
}

.preview-badge {
  background: var(--glass-bg-hover);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 9999px;
}

/* ── Preview Grid ── */
.previews {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.preview-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 280px;
  background: rgba(0, 0, 0, 0.22);
  border-radius: calc(var(--radius-lg) - 4px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.preview-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.2s ease;
}

.preview-box img:hover {
  transform: scale(1.02);
}

.preview-meta {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 12px;
}

/* ── Lightbox ── */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  animation: fade-in 0.15s ease;
}

.lightbox-image {
  max-width: 92vw;
  max-height: 92vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  animation: scale-in 0.15s ease;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scale-in {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ── GIF Frame Navigation ── */
.gif-filmstrip {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: calc(var(--radius-lg) - 4px);
}

.gif-nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--glass-border);
  border-radius: 0.5rem;
  background: transparent;
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s ease;
  padding: 0;
  line-height: 1;
}

.gif-nav-btn:hover:not(:disabled) {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.gif-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.gif-thumbnails {
  display: flex;
  gap: 2px;
  flex: 1;
  justify-content: center;
  padding: 2px 0;
}

.gif-thumb {
  flex-shrink: 0;
  padding: 2px 8px;
  min-width: 28px;
  text-align: center;
  border: 1px solid var(--glass-border);
  border-radius: calc(0.5rem - 2px);
  background: transparent;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.gif-thumb:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
}

.gif-thumb.active {
  background: rgba(245, 158, 11, 0.12);
  border-color: var(--accent);
  color: var(--accent);
}

.gif-counter {
  font-size: 12px;
  color: hsl(0 0% 63.9%);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  min-width: 48px;
  text-align: right;
}

/* ── ICO Preview Tabs ── */
.ico-preview-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
  padding: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: calc(var(--radius-lg) - 4px);
  justify-content: center;
}

.ico-preview-tab {
  padding: 4px 12px;
  border: 1px solid var(--glass-border);
  border-radius: calc(0.5rem - 2px);
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.ico-preview-tab:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
}

.ico-preview-tab.active {
  background: rgba(245, 158, 11, 0.12);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Crop/Resize Inputs ── */
.crop-inputs,
.nested-inputs {
  margin-top: 8px;
  padding: 12px;
  background: hsl(0 0% 5%);
  border-radius: calc(0.5rem - 2px);
  border: 1px solid hsl(0 0% 14.9%);
}

.input-row {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
}

.input-row:last-child {
  margin-bottom: 0;
}

.input-row label {
  font-size: 13px;
  color: hsl(0 0% 63.9%);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── GIF Loading ── */
.gif-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: hsl(0 0% 63.9%);
  font-size: 13px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(245, 158, 11, 0.5);
}

/* ── Loading Overlay (Glassmorphism) ── */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.loading-text {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ── Composited spinner (survives main-thread blocks) ── */
@keyframes spin {
  to { transform: rotate(1turn); }
}

.composited-spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 3px solid rgba(245, 158, 11, 0.25);
  border-top-color: var(--accent);
  border-radius: 9999px;
  animation: spin 0.6s linear infinite;
  will-change: transform;
}

/* ── Parameter Panel ── */
.parameter-card {
  padding: 24px;
  margin-bottom: 20px;
}

.parameter-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.parameter-group {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--glass-border);
}

.parameter-group:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.parameter-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
}

.parameter-nested {
  margin-top: 12px;
  padding: 14px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: calc(var(--radius-lg) - 4px);
}

.parameter-input {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: 0.5rem;
  color: var(--text-primary);
  padding: 4px 8px;
  font-size: 13px;
  width: 72px;
  transition: all 0.15s ease;
}

.parameter-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.range-accent {
  accent-color: var(--accent);
}

.parameter-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.ico-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--glass-border);
  border-radius: 0.5rem;
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.ico-chip:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
}

.ico-chip.active {
  background: rgba(245, 158, 11, 0.12);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .top-bar {
    flex-direction: column;
  }

  .top-bar .upload-section {
    width: 100%;
  }

  .top-bar-right {
    width: 100%;
    justify-content: space-between;
  }

  .previews {
    grid-template-columns: 1fr;
  }

  .main {
    padding: 16px;
  }
}