:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e0e2e7;
  --color-text: #1c1f26;
  --color-muted: #6b7280;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;
  --color-success: #16a34a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161c;
    --color-surface: #1d2028;
    --color-border: #2c303a;
    --color-text: #e9eaee;
    --color-muted: #9aa0ab;
    --color-primary: #818cf8;
    --color-primary-hover: #6366f1;
    --color-danger: #f87171;
    --color-danger-bg: #3f1d1d;
    --color-success: #4ade80;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 40px 0 28px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.btn {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-muted); }

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

.hidden { display: none !important; }

.help-box {
  margin-top: 0;
}

.help-box h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.help-box ol {
  margin: 0;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.help-box code {
  background: var(--color-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.site-footer {
  text-align: center;
  padding: 24px 0;
  color: var(--color-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* HEIC to JPG converter */

.heic-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  padding: 32px 20px 60px;
  align-items: start;
}

@media (max-width: 900px) {
  .heic-layout {
    grid-template-columns: 1fr;
  }
}

.heic-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.drop-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.drop-icon {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.drop-title {
  font-weight: 700;
  margin: 4px 0;
}

.drop-subtitle {
  color: var(--color-muted);
  margin: 4px 0;
  font-size: 0.85rem;
}

.drop-note {
  color: var(--color-muted);
  font-size: 0.8rem;
  margin: 14px 0 0;
}

.options-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.quality-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted);
  white-space: nowrap;
}

.options-row input[type="range"] {
  flex: 1;
  accent-color: var(--color-primary);
}

.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.file-list-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.panel-actions {
  display: flex;
  gap: 8px;
}

.file-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: var(--color-bg);
}

.file-thumb {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.file-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-thumb-placeholder {
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--color-muted);
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-status {
  margin: 2px 0 0;
  font-size: 0.78rem;
  color: var(--color-muted);
}

.file-status.error { color: var(--color-danger); }
.file-status.done { color: var(--color-success); }

.file-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.file-actions .btn {
  font-size: 0.78rem;
  padding: 6px 10px;
}

.btn-remove-file {
  border: none;
  background: var(--color-danger-bg);
  color: var(--color-danger);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
}
.btn-remove-file:hover { opacity: 0.85; }

.heic-help {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.heic-privacy {
  margin: 14px 0 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}