/* ─── CSS Custom Properties ─────────────────────────────── */
:root {
  --color-bg:            #f8fafc;
  --color-surface:       #ffffff;
  --color-surface-2:     #f1f5f9;
  --color-border:        #e2e8f0;
  --color-border-hover:  #cbd5e1;
  --color-accent:        #6c63ff;
  --color-accent-hover:  #5a52e0;
  --color-accent-light:  #ede9ff;
  --color-text:          #1e293b;
  --color-text-muted:    #64748b;
  --color-success:       #16a34a;
  --color-success-bg:    #f0fdf4;
  --color-warning-bg:    #fffbeb;
  --color-warning-text:  #92400e;
  --color-warning-border:#fcd34d;
  --color-info-bg:       #eff6ff;
  --color-info-text:     #1e40af;
  --color-info-border:   #bfdbfe;
  --color-error:         #dc2626;
  --color-error-bg:      #fef2f2;
  --shadow-sm:           0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md:           0 4px 12px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.05);
  --shadow-lg:           0 10px 30px rgba(0,0,0,.10);
  --radius-sm:           6px;
  --radius-md:           12px;
  --radius-lg:           20px;
  --transition:          160ms ease;
  --font:                -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

[data-theme="dark"] {
  --color-bg:            #0f1117;
  --color-surface:       #1a1d27;
  --color-surface-2:     #22263a;
  --color-border:        #2d3142;
  --color-border-hover:  #414766;
  --color-accent:        #8b85ff;
  --color-accent-hover:  #7a73ff;
  --color-accent-light:  #1e1b4b;
  --color-text:          #e2e8f0;
  --color-text-muted:    #94a3b8;
  --color-success:       #22c55e;
  --color-success-bg:    #052e16;
  --color-warning-bg:    #1c1500;
  --color-warning-text:  #fbbf24;
  --color-warning-border:#78350f;
  --color-info-bg:       #0c1a2e;
  --color-info-text:     #93c5fd;
  --color-info-border:   #1e3a5f;
  --color-error:         #f87171;
  --color-error-bg:      #1f0606;
  --shadow-sm:           0 1px 3px rgba(0,0,0,.4);
  --shadow-md:           0 4px 12px rgba(0,0,0,.4);
  --shadow-lg:           0 10px 30px rgba(0,0,0,.5);
}

/* ─── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ─── App Layout ────────────────────────────────────────── */
#app {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

/* ─── Header ─────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 16px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 4px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon { font-size: 1.5rem; }

.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -.3px;
}

.brand-tagline {
  font-size: .75rem;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 99px;
  padding: 2px 10px;
}

.theme-toggle {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover { background: var(--color-accent-light); border-color: var(--color-accent); transform: rotate(20deg); }

/* ─── Tab Bar ────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: 4px;
  padding: 12px 0 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  font-family: var(--font);
  font-size: .925rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.tab-btn:hover { color: var(--color-text); background: var(--color-surface-2); }

.tab-btn.active,
.tab-btn[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

.tab-icon { font-size: 1rem; }

/* ─── FFmpeg Loader ──────────────────────────────────────── */
.ffmpeg-loader {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.loader-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.loader-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.loader-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

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

.loader-track {
  width: 100%;
  height: 8px;
  background: var(--color-border);
  border-radius: 99px;
  overflow: hidden;
}

.loader-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 99px;
  transition: width .25s ease;
}

/* ─── Notifications ──────────────────────────────────────── */
.notifications {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 360px;
}

.notification {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: .875rem;
  box-shadow: var(--shadow-md);
  animation: slideIn .2s ease;
  border-left: 4px solid transparent;
}

@keyframes slideIn { from { transform: translateX(20px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

.notification.error   { background: var(--color-error-bg);   border-color: var(--color-error);   color: var(--color-error); }
.notification.warning { background: var(--color-warning-bg); border-color: var(--color-warning-border); color: var(--color-warning-text); }
.notification.success { background: var(--color-success-bg); border-color: var(--color-success); color: var(--color-success); }

/* ─── Tab Panels ─────────────────────────────────────────── */
.tab-panel { animation: fadeIn .15s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Drop Zone ──────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone:focus-within {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  outline: none;
}

.drop-zone.drag-over {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent) 15%, transparent);
}

.drop-icon { font-size: 2.5rem; margin-bottom: 12px; }
.drop-title { font-size: 1.05rem; font-weight: 600; color: var(--color-text); margin-bottom: 6px; }
.drop-hint  { font-size: .825rem; color: var(--color-text-muted); line-height: 1.5; }

/* ─── Settings Panel ──────────────────────────────────────── */
.settings-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 16px;
  box-shadow: var(--shadow-sm);
}

.file-info-bar {
  font-size: .85rem;
  color: var(--color-text-muted);
  padding: 8px 12px;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
  word-break: break-all;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.setting-group { display: flex; flex-direction: column; gap: 6px; }

.setting-label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.setting-select,
.setting-input {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font);
  font-size: .9rem;
  transition: border-color var(--transition);
}

.setting-select:focus,
.setting-input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent); }

.setting-select:disabled,
.setting-input:disabled { opacity: .5; cursor: not-allowed; }

/* ─── Range Input ─────────────────────────────────────────── */
.range-input {
  width: 100%;
  accent-color: var(--color-accent);
  cursor: pointer;
  height: 4px;
}

/* ─── Resize Fieldset ────────────────────────────────────── */
.resize-fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 16px;
}

.resize-fieldset legend { padding: 0 6px; }

.resize-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.resize-x { color: var(--color-text-muted); font-size: .9rem; padding-bottom: 8px; }

.aspect-lock {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--color-text-muted);
  cursor: pointer;
  padding-bottom: 8px;
}

.aspect-lock input { accent-color: var(--color-accent); cursor: pointer; }

/* ─── Buttons ─────────────────────────────────────────────── */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: .925rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--color-accent-hover); transform: translateY(-1px); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover:not(:disabled) { border-color: var(--color-accent); color: var(--color-accent); }

.btn-convert { margin-top: 8px; width: 100%; justify-content: center; }

.btn-reset {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.btn-reset:hover { color: var(--color-error); border-color: var(--color-error); background: var(--color-error-bg); }

/* ─── Progress ────────────────────────────────────────────── */
.progress-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 16px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: .85rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

progress {
  width: 100%;
  height: 8px;
  border-radius: 99px;
  border: none;
  overflow: hidden;
  appearance: none;
  -webkit-appearance: none;
}

progress::-webkit-progress-bar { background: var(--color-surface-2); border-radius: 99px; }
progress::-webkit-progress-value { background: var(--color-accent); border-radius: 99px; transition: width .2s ease; }
progress::-moz-progress-bar { background: var(--color-accent); border-radius: 99px; }

/* ─── Result Area ─────────────────────────────────────────── */
.result-area {
  background: var(--color-success-bg);
  border: 1px solid color-mix(in srgb, var(--color-success) 30%, transparent);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--color-success);
  font-size: .95rem;
}

.result-info { font-size: .82rem; color: var(--color-text-muted); }
.result-info .savings-smaller { color: var(--color-success); font-weight: 600; }
.result-info .savings-larger  { color: var(--color-warning-text); font-weight: 600; }
.result-info .savings-same    { color: var(--color-text-muted); }

/* ─── Audio / Video Players ──────────────────────────────── */
.audio-player,
.video-player { width: 100%; border-radius: var(--radius-sm); }
.video-player { max-height: 280px; background: #000; }

/* ─── Preview Box (audio before) ────────────────────────── */
.preview-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 12px;
}

.preview-label { font-size: .78rem; font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }

/* ─── Thumbnail ───────────────────────────────────────────── */
.thumb-preview {
  margin-bottom: 12px;
}

.thumb-preview img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  object-fit: cover;
  display: block;
}

/* ─── Warning / Info Banners ─────────────────────────────── */
.warning-banner {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  color: var(--color-warning-text);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .85rem;
  margin-top: 12px;
}

.info-banner {
  background: var(--color-info-bg);
  border: 1px solid var(--color-info-border);
  color: var(--color-info-text);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .85rem;
  margin-bottom: 12px;
}

/* ─── Image Queue ─────────────────────────────────────────── */
.image-queue {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.queue-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.queue-item.done   { border-color: color-mix(in srgb, var(--color-success) 40%, transparent); }
.queue-item.failed { border-color: color-mix(in srgb, var(--color-error) 40%, transparent); }

.queue-thumb {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
}

.queue-thumb-placeholder {
  width: 64px;
  height: 64px;
  background: var(--color-surface-2);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.queue-info { flex: 1; min-width: 0; }
.queue-name { font-size: .875rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.queue-meta { font-size: .78rem; color: var(--color-text-muted); margin-top: 4px; }
.queue-status { font-size: .8rem; margin-top: 6px; }
.queue-status.ok      { color: var(--color-success); }
.queue-status.pending { color: var(--color-text-muted); }
.queue-status.fail    { color: var(--color-error); }

.queue-arrow { color: var(--color-text-muted); font-size: 1.2rem; flex-shrink: 0; }

.queue-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

/* ─── Modal ───────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 200;
  backdrop-filter: blur(2px);
}

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  padding: 16px;
}

.modal-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.modal-icon { font-size: 2.5rem; margin-bottom: 16px; }

.modal-box h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.modal-box p {
  font-size: .95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.privacy-list {
  list-style: none;
  text-align: left;
  margin: 0 0 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.privacy-list li {
  font-size: .875rem;
  color: var(--color-text-muted);
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.privacy-list li::before { content: '✓'; position: absolute; left: 0; color: var(--color-success); font-weight: 700; }

/* ─── Footer ─────────────────────────────────────────────── */
.app-footer {
  max-width: 780px;
  margin: 0 auto;
  padding: 32px 16px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--color-border);
}

.bmc-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background: #FFDD00;
  color: #000000;
  border-radius: 8px;
  font-family: var(--font);
  font-size: .95rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0,0,0,.12);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  border: 2px solid transparent;
}

.bmc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,.18);
  background: #FFE933;
}

.bmc-btn:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 25%, transparent);
}

.bmc-icon { font-size: 1.2rem; }

.footer-note {
  font-size: .78rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  .settings-grid { grid-template-columns: 1fr 1fr; }
  .tab-btn { padding: 10px 14px; font-size: .85rem; }
  .tab-label { display: none; }
  .tab-icon { font-size: 1.2rem; }
  .drop-zone { padding: 36px 20px; }
  .modal-box { padding: 28px 20px; }
  .resize-row { flex-direction: column; align-items: stretch; }
  .resize-x { display: none; }
}

@media (max-width: 400px) {
  .settings-grid { grid-template-columns: 1fr; }
  .brand-tagline { display: none; }
}