/* ---------------------------------------------------------------------------
   Image Converter — minimal theme.
   System fonts, neutral grays, one blue accent. Light and dark via the same
   variable set; dark applies through OS preference or [data-theme].
--------------------------------------------------------------------------- */

:root {
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --bg-page: #F4F5F6;
  --bg-card: #FFFFFF;
  --bg-subtle: #F5F6F7;
  --text: #1A1D21;
  --text-muted: #6B7280;
  --text-faint: #9CA3AF;
  --text-label: #4B5563;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-contrast: #FFFFFF;
  --accent-bg: #EBF1FE;
  --accent-tint: #F4F7FE;
  --accent-ring: rgba(37, 99, 235, 0.18);
  --border: #E2E4E8;
  --border-strong: #C9CDD3;
  --divider: #ECEDEF;
  --success: #15803D;
  --success-bg: #EAF6EE;
  --success-border: #CBE7D3;
  --danger: #C2382F;
  --danger-bg: #FBEDEB;
  --danger-border: #F2D2CD;
  --warn: #B45309;
  --toggle-off: #D1D5DB;
  --thumb-bg: #E8EAEC;
  --shadow-card: 0 1px 3px rgba(16, 20, 24, 0.06), 0 8px 28px rgba(16, 20, 24, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-page: #111315;
    --bg-card: #1A1D1F;
    --bg-subtle: #22262A;
    --text: #E8EAED;
    --text-muted: #9AA0A8;
    --text-faint: #6B7178;
    --text-label: #B4BAC2;
    --accent: #5B8DEF;
    --accent-hover: #7BA3F2;
    --accent-contrast: #10141A;
    --accent-bg: #1F2B42;
    --accent-tint: #1E2530;
    --accent-ring: rgba(91, 141, 239, 0.25);
    --border: #2C3136;
    --border-strong: #3D434A;
    --divider: #24282C;
    --success: #7BC98A;
    --success-bg: #1B2B1F;
    --success-border: #2C4633;
    --danger: #E57A6E;
    --danger-bg: #33201C;
    --danger-border: #4E2E27;
    --warn: #DFA04A;
    --toggle-off: #3D434A;
    --thumb-bg: #272C30;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 28px rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="dark"] {
  --bg-page: #111315;
  --bg-card: #1A1D1F;
  --bg-subtle: #22262A;
  --text: #E8EAED;
  --text-muted: #9AA0A8;
  --text-faint: #6B7178;
  --text-label: #B4BAC2;
  --accent: #5B8DEF;
  --accent-hover: #7BA3F2;
  --accent-contrast: #10141A;
  --accent-bg: #1F2B42;
  --accent-tint: #1E2530;
  --accent-ring: rgba(91, 141, 239, 0.25);
  --border: #2C3136;
  --border-strong: #3D434A;
  --divider: #24282C;
  --success: #7BC98A;
  --success-bg: #1B2B1F;
  --success-border: #2C4633;
  --danger: #E57A6E;
  --danger-bg: #33201C;
  --danger-border: #4E2E27;
  --warn: #DFA04A;
  --toggle-off: #3D434A;
  --thumb-bg: #272C30;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 28px rgba(0, 0, 0, 0.35);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-page);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
}

.container {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-card);
  padding: 32px;
  max-width: 560px;
  width: 100%;
}

h1 {
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.84rem;
  margin-bottom: 22px;
  max-width: 40ch;
}

.theme-toggle {
  position: absolute;
  top: 30px;
  right: 32px;
  padding: 5px 12px;
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.theme-toggle:hover { border-color: var(--border-strong); color: var(--text); }

/* Drop zone */
.drop-zone {
  border: 1.5px dashed var(--border-strong);
  border-radius: 10px;
  padding: 30px 24px 26px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
  margin-bottom: 20px;
  background: var(--bg-subtle);
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-tint);
}

.drop-zone .icon {
  width: 42px;
  height: 42px;
  margin: 0 auto 10px;
  background: var(--accent-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.drop-zone p {
  color: var(--text-muted);
  font-size: 0.86rem;
}

.drop-zone p span {
  color: var(--accent);
  font-weight: 600;
}

.drop-formats {
  margin-top: 8px;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-faint);
}

/* Settings */
.settings {
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 0;
  border-bottom: 1px solid var(--divider);
}

.setting-group:first-child { padding-top: 6px; }
.setting-group:last-child { border-bottom: none; padding-bottom: 4px; }

.group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.group-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.setting-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.setting-label {
  font-size: 0.82rem;
  color: var(--text-label);
  min-width: 60px;
  flex-shrink: 0;
}

.group-options {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.group-options.disabled,
.quality-group.disabled {
  opacity: 0.4;
  pointer-events: none;
}

select {
  padding: 8px 28px 8px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  background-color: var(--bg-card);
  color: var(--text);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23888E96' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
  transition: border-color 0.15s;
}

select:hover { border-color: var(--border-strong); }
select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-ring); }

input[type="number"],
input[type="text"] {
  width: 80px;
  padding: 8px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  color: var(--text);
  background: var(--bg-card);
  transition: border-color 0.15s;
}

input[type="text"] { width: 150px; }

input[type="number"]:hover,
input[type="text"]:hover { border-color: var(--border-strong); }
input[type="number"]:focus,
input[type="text"]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-ring); }

.unit {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.input-sm { width: 64px; }

.resize-wrap {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.upscale-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.8rem;
  color: var(--text-label);
  cursor: pointer;
  user-select: none;
}

.upscale-label input { accent-color: var(--accent); }

.rename-pattern {
  flex: 1;
  width: auto;
  min-width: 140px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.rename-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.rename-preview {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rename-hint {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-faint);
}

.rename-warn {
  font-size: 0.72rem;
  color: var(--warn);
}

/* Quality slider */
.quality-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  min-width: 70px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.quality-val {
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  min-width: 26px;
  text-align: right;
}

/* Toggles */
.toggle {
  position: relative;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--toggle-off);
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-track::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle input:checked + .toggle-track {
  background: var(--accent);
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(16px);
}

/* File list */
.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.15s;
}

.file-item:hover { border-color: var(--border-strong); }

.file-item img {
  width: 44px;
  height: 32px;
  object-fit: cover;
  border-radius: 4px;
  background: var(--thumb-bg);
  flex-shrink: 0;
}

.thumb-placeholder {
  width: 44px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 4px;
  background: var(--thumb-bg);
  color: var(--text-muted);
  font-size: 0.56rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.file-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.file-tools {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}

.tool-btn {
  background: none;
  border: none;
  color: var(--text-faint);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 4px 5px;
  border-radius: 5px;
  transition: color 0.15s, background 0.15s;
  line-height: 1;
}

.tool-btn:hover,
.tool-btn.active { color: var(--accent); background: var(--accent-bg); }

.remove-btn {
  background: none;
  border: none;
  color: var(--text-faint);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 5px;
  transition: color 0.15s, background 0.15s;
  line-height: 1;
}

.remove-btn:hover { color: var(--danger); background: var(--danger-bg); }

/* Status chips */
.file-status {
  flex-shrink: 0;
  font-size: 0.62rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
}

.file-status.queued { background: var(--thumb-bg); color: var(--text-muted); }
.file-status.converting { background: var(--accent-bg); color: var(--accent); }
.file-status.done { background: var(--success-bg); color: var(--success); }
.file-status.error { background: var(--danger-bg); color: var(--danger); }

/* Convert button */
.convert-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  border-radius: 9px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}

.convert-btn:hover { background: var(--accent-hover); box-shadow: 0 2px 10px var(--accent-ring); }
.convert-btn:disabled { background: var(--border); color: var(--text-faint); cursor: default; box-shadow: none; }

/* Progress bar */
.progress {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 12px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.2s ease;
}

/* Results */
.results { margin-top: 24px; }

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

.results-header h3 {
  font-size: 0.95rem;
  font-weight: 650;
}

.results-summary {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
}

.download-all-btn {
  padding: 7px 14px;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.76rem;
  font-weight: 550;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.15s, background 0.15s;
}

.download-all-btn:hover { border-color: var(--border-strong); background: var(--bg-subtle); }

.result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 10px;
  background: var(--bg-subtle);
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 6px;
  transition: border-color 0.15s;
}

.result-item:hover { border-color: var(--border-strong); }

.result-item img {
  width: 44px;
  height: 32px;
  object-fit: cover;
  border-radius: 4px;
  background: var(--thumb-bg);
  cursor: zoom-in;
  flex-shrink: 0;
}

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

.result-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 3px;
}

.result-size {
  font-size: 0.68rem;
  color: var(--success);
  font-weight: 600;
}

.result-savings {
  font-size: 0.66rem;
  color: var(--text-faint);
}

.result-warn {
  font-size: 0.66rem;
  color: var(--warn);
}

.download-btn {
  padding: 7px 14px;
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
  transition: background 0.15s;
}

.download-btn:hover { background: var(--accent-hover); }

/* Error result rows */
.result-item.error {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

.result-error-msg {
  font-size: 0.72rem;
  color: var(--danger);
  margin-top: 2px;
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(12, 14, 16, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 10;
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  padding: 20px;
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.modal-head h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 12px;
}

.compare-wrap {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background:
    repeating-conic-gradient(var(--bg-subtle) 0% 25%, var(--bg-card) 0% 50%)
    0 0 / 16px 16px;
}

.compare-wrap img {
  display: block;
  width: 100%;
}

.compare-wrap .compare-before {
  position: absolute;
  inset: 0;
  height: 100%;
  object-fit: contain;
}

.compare-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  font-weight: 550;
  color: var(--text-muted);
  margin: 8px 2px 2px;
}

.modal-box input[type="range"] {
  width: 100%;
  margin-top: 6px;
}

.compare-meta {
  margin-top: 10px;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* Crop modal */
.crop-stage {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-subtle);
  touch-action: none;
  user-select: none;
}

.crop-stage img {
  display: block;
  width: 100%;
  pointer-events: none;
}

.crop-rect {
  position: absolute;
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 9999px rgba(12, 14, 16, 0.5);
  cursor: move;
}

.crop-handle {
  position: absolute;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 2px solid #fff;
  border-radius: 50%;
}

.crop-handle.tl { top: -8px; left: -8px; cursor: nwse-resize; }
.crop-handle.tr { top: -8px; right: -8px; cursor: nesw-resize; }
.crop-handle.bl { bottom: -8px; left: -8px; cursor: nesw-resize; }
.crop-handle.br { bottom: -8px; right: -8px; cursor: nwse-resize; }

.crop-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.crop-spacer { flex: 1; }

/* Accessibility */
button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible,
.toggle input:focus-visible + .toggle-track {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

.hidden { display: none; }

@media (max-width: 480px) {
  .container { padding: 24px 18px; }
  .theme-toggle { top: 22px; right: 18px; }
  h1 { font-size: 1.2rem; }
}