:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", "Microsoft YaHei Mono", monospace;
  --font-chinese: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --color-page-start: #100e0c;
  --color-page-mid: #1b1510;
  --color-page-end: #0d1117;
  --color-ink: #f7efe3;
  --color-muted: #afa89c;
  --color-dim: #777066;
  --color-paper: #18130f;
  --color-surface-deep: #0a0a0a;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-panel: rgba(32, 26, 20, 0.76);
  --color-panel-strong: rgba(45, 36, 27, 0.92);
  --color-line: rgba(247, 239, 227, 0.14);
  --color-line-strong: rgba(247, 239, 227, 0.24);
  --color-line-faint: rgba(247, 239, 227, 0.035);
  --color-ink-soft: rgba(247, 239, 227, 0.18);
  --color-ink-checker: rgba(255, 255, 255, 0.05);
  --color-surface-glass: rgba(255, 255, 255, 0.06);
  --color-surface-glass-hover: rgba(255, 255, 255, 0.1);
  --color-surface-soft: rgba(255, 255, 255, 0.04);
  --color-surface-softer: rgba(255, 255, 255, 0.03);
  --color-surface-wash: rgba(255, 255, 255, 0.015);
  --color-surface-hover: rgba(255, 255, 255, 0.08);
  --color-card: rgba(255, 255, 255, 0.045);
  --color-card-hover: rgba(255, 255, 255, 0.06);
  --color-overlay: rgba(0, 0, 0, 0.3);
  --color-overlay-strong: rgba(0, 0, 0, 0.74);
  --color-overlay-preview: rgba(0, 0, 0, 0.28);
  --color-processing-overlay: rgba(13, 17, 23, 0.68);
  --color-mask-strong: rgba(0, 0, 0, 0.9);
  --color-accent: #f0b86e;
  --color-accent-strong: #ffca84;
  --color-accent-hot: #ffe7ba;
  --color-accent-ink: #25190d;
  --color-accent-wash: rgba(240, 184, 110, 0.24);
  --color-accent-cloud: rgba(240, 184, 110, 0.14);
  --color-accent-quiet: rgba(240, 184, 110, 0.06);
  --color-accent-line: rgba(240, 184, 110, 0.9);
  --color-accent-shadow: rgba(240, 184, 110, 0.12);
  --color-accent-ring: rgba(240, 184, 110, 0.16);
  --color-warm-bloom: rgba(139, 92, 54, 0.34);
  --color-focus-ring: rgba(255, 224, 173, 0.36);
  --color-gold-glow: rgba(255, 224, 173, 0.9);
  --color-gold-fade: rgba(240, 184, 110, 0.1);
  --color-brown-stripe: rgba(25, 17, 10, 0.35);
  --color-danger: #ff8f7a;
  --color-success: #9fd8a9;
  --color-focus: #ffe0ad;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --shadow-soft: 0 1rem 3rem var(--color-overlay);
  --shadow-glow: 0 0 0 1px var(--color-accent-ring), 0 1rem 4rem var(--color-accent-shadow);
  --transition-fast: 160ms ease;
  --transition-normal: 260ms ease;
  --control-height: 3rem;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.5;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at top left, var(--color-accent-wash), transparent 34rem),
    radial-gradient(circle at 88% 14%, var(--color-warm-bloom), transparent 26rem),
    linear-gradient(145deg, var(--color-page-start) 0%, var(--color-page-mid) 44%, var(--color-page-end) 100%);
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(var(--color-line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line-faint) 1px, transparent 1px);
  background-size: 3.25rem 3.25rem;
  mask-image: linear-gradient(to bottom, var(--color-mask-strong), transparent 88%);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link,
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  z-index: 10;
  width: auto;
  height: auto;
  margin: var(--space-4);
  padding: var(--space-3) var(--space-4);
  clip: auto;
  color: var(--color-accent-ink);
  background: var(--color-accent-strong);
  border-radius: var(--radius-sm);
}

.app-shell {
  width: min(100%, 96rem);
  margin: 0 auto;
  padding: max(var(--space-5), env(safe-area-inset-top)) var(--space-4) max(var(--space-6), env(safe-area-inset-bottom));
}

.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5) 0 var(--space-7);
}

.hero__mark {
  display: grid;
  width: 4.5rem;
  aspect-ratio: 1;
  place-items: center;
  color: var(--color-accent-ink);
  font-weight: 900;
  letter-spacing: -0.08em;
  background:
    linear-gradient(135deg, var(--color-focus), var(--color-accent)),
    radial-gradient(circle, var(--color-white) 0%, transparent 62%);
  border-radius: 32% 68% 35% 65% / 40% 35% 65% 60%;
  box-shadow: var(--shadow-glow);
  transform: rotate(-8deg);
}

.hero__copy {
  min-width: 0;
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--color-accent-strong);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: var(--space-2);
  font-size: clamp(2.25rem, 12vw, 5.75rem);
  line-height: 0.9;
  letter-spacing: -0.08em;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.25rem, 5vw, 1.75rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: var(--space-2);
  font-size: clamp(1.15rem, 4vw, 1.55rem);
  line-height: 1.15;
}

.hero__lead {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--color-muted);
}

.workspace {
  display: grid;
  gap: var(--space-4);
}

.control-panel,
.gallery-panel {
  min-width: 0;
}

.control-panel {
  display: grid;
  gap: var(--space-4);
}

.panel-card,
.gallery-panel,
.preview-dialog__surface {
  border: 1px solid var(--color-line);
  background:
    linear-gradient(150deg, var(--color-surface-hover), var(--color-surface-wash)),
    var(--color-panel);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(22px);
}

.panel-card {
  padding: var(--space-5);
}

.section-heading {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.drop-zone {
  display: grid;
  min-height: 11rem;
  place-items: center;
  gap: var(--space-2);
  padding: var(--space-6);
  color: var(--color-muted);
  text-align: center;
  border: 1px dashed var(--color-line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at center, var(--color-accent-cloud), transparent 70%),
    var(--color-line-faint);
  transition: transform var(--transition-normal), border-color var(--transition-normal), background var(--transition-normal);
}

.drop-zone strong {
  color: var(--color-ink);
}

.drop-zone__icon {
  width: 3rem;
  aspect-ratio: 1;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, transparent 45%, var(--color-accent-line) 46% 54%, transparent 55%),
    linear-gradient(45deg, transparent 45%, var(--color-line-strong) 46% 54%, transparent 55%),
    var(--color-surface-soft);
  box-shadow: inset 0 0 0 0.5rem var(--color-surface-softer);
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.is-dragover {
  border-color: var(--color-accent-strong);
  background:
    radial-gradient(circle at center, var(--color-accent-wash), transparent 72%),
    var(--color-surface-glass);
  outline: none;
  transform: translateY(-2px);
}

.panel-actions,
.toolbar-actions,
.preview-dialog__footer {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.panel-actions {
  margin-top: var(--space-4);
}

.button,
.icon-button {
  min-height: var(--control-height);
  border: 1px solid transparent;
  border-radius: 999px;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), opacity var(--transition-fast);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 7.25rem;
  padding: 0 var(--space-5);
  font-weight: 800;
}

.button:active,
.icon-button:active {
  transform: translateY(1px) scale(0.98);
}

.button:focus-visible,
.icon-button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 3px;
}

.button--primary,
.button--accent {
  color: var(--color-accent-ink);
  background: linear-gradient(135deg, var(--color-accent-strong), var(--color-accent));
  box-shadow: var(--shadow-glow);
}

.button--primary:hover,
.button--accent:hover {
  background: linear-gradient(135deg, var(--color-accent-hot), var(--color-accent-strong));
  transform: translateY(-1px);
}

.button--ghost {
  color: var(--color-ink);
  background: var(--color-ink-checker);
  border-color: var(--color-line);
}

.button--ghost:hover:not(:disabled) {
  border-color: var(--color-line-strong);
  background: var(--color-surface-hover);
}

.button:disabled {
  opacity: 0.44;
  box-shadow: none;
}

.settings-form {
  display: grid;
  gap: var(--space-5);
}

.field {
  display: grid;
  gap: var(--space-3);
}

.field__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  align-items: baseline;
}

.field__label {
  color: var(--color-ink);
  font-weight: 800;
}

.field__hint,
output,
.image-count,
.status-message,
.preview-dialog__footer span {
  color: var(--color-muted);
  font-size: 0.9rem;
}

input[type="text"],
select,
.color-input-wrap {
  width: 100%;
  min-height: var(--control-height);
  color: var(--color-ink);
  background: var(--color-surface-glass);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

input[type="text"],
select {
  padding: 0 var(--space-4);
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--color-accent-strong) 50%), linear-gradient(135deg, var(--color-accent-strong) 50%, transparent 50%);
  background-position: calc(100% - 1.25rem) 52%, calc(100% - 0.85rem) 52%;
  background-size: 0.4rem 0.4rem, 0.4rem 0.4rem;
  background-repeat: no-repeat;
}

.color-input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
}

input[type="color"] {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-line-strong);
  border-radius: 50%;
  background: transparent;
}

input[type="range"] {
  width: 100%;
  min-height: 2.75rem;
  accent-color: var(--color-accent-strong);
}

.gallery-panel {
  display: grid;
  align-content: start;
  gap: var(--space-4);
  padding: var(--space-5);
}

.gallery-toolbar {
  display: grid;
  gap: var(--space-4);
}

.status-message {
  min-height: 1.5rem;
}

.empty-state {
  display: grid;
  min-height: 24rem;
  place-items: center;
  align-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-5);
  color: var(--color-muted);
  text-align: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, var(--color-surface-soft), var(--color-surface-wash)),
    repeating-linear-gradient(-30deg, transparent 0 2.5rem, var(--color-accent-quiet) 2.5rem 2.65rem);
}

.empty-state[hidden],
.gallery-grid[hidden] {
  display: none;
}

.empty-state h3,
.empty-state p {
  max-width: 32rem;
  margin-bottom: 0;
}

.empty-state__orb {
  width: 7rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    linear-gradient(135deg, var(--color-gold-glow), var(--color-gold-fade)),
    repeating-linear-gradient(-30deg, transparent 0 1rem, var(--color-brown-stripe) 1rem 1.15rem);
  box-shadow: var(--shadow-glow);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-4);
}

.image-card {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
  padding: var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-card);
  transition: transform var(--transition-normal), border-color var(--transition-normal), background var(--transition-normal);
}

.image-card:hover {
  border-color: var(--color-line-strong);
  background: var(--color-card-hover);
  transform: translateY(-2px);
}

.image-button {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  overflow: hidden;
  color: inherit;
  background:
    linear-gradient(45deg, var(--color-ink-checker) 25%, transparent 25% 75%, var(--color-ink-checker) 75%),
    linear-gradient(45deg, var(--color-ink-checker) 25%, transparent 25% 75%, var(--color-ink-checker) 75%),
    var(--color-surface-deep);
  background-position: 0 0, 0.6rem 0.6rem, 0 0;
  background-size: 1.2rem 1.2rem, 1.2rem 1.2rem, auto;
  border: 0;
  border-radius: var(--radius-md);
  aspect-ratio: 4 / 3;
}

.image-button::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(to top, var(--color-overlay-preview), transparent 38%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.image-button:hover::after,
.image-button:focus-visible::after {
  opacity: 1;
}

.image-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity var(--transition-normal);
}

.image-card.is-processing img {
  opacity: 0;
}

.image-card.is-updating img {
  opacity: 0.78;
}

.image-card__meta {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}

.image-card__name {
  overflow: hidden;
  color: var(--color-ink);
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-card__details {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.image-card__actions {
  display: flex;
  gap: var(--space-2);
}

.card-badge {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  z-index: 2;
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.7rem;
  color: var(--color-ink);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--color-overlay-strong);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

.image-card.is-processing .card-badge,
.image-card.is-updating .card-badge {
  display: inline-flex;
}

.card-badge .spinner {
  width: 0.9rem;
  border-width: 2px;
}

.spinner {
  width: 2.25rem;
  aspect-ratio: 1;
  border: 3px solid var(--color-ink-soft);
  border-top-color: var(--color-accent-strong);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.preview-dialog {
  width: min(calc(100vw - var(--space-4) * 2), 70rem);
  max-height: calc(100vh - var(--space-4) * 2);
  padding: 0;
  color: var(--color-ink);
  background: transparent;
  border: 0;
}

.preview-dialog::backdrop {
  background: var(--color-overlay-strong);
  backdrop-filter: blur(10px);
}

.preview-dialog__surface {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
}

.preview-dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.icon-button {
  display: grid;
  width: var(--control-height);
  padding: 0;
  place-items: center;
  color: var(--color-ink);
  font-size: 1.75rem;
  line-height: 1;
  background: var(--color-surface-glass);
  border-color: var(--color-line);
}

.icon-button:hover {
  background: var(--color-surface-glass-hover);
}

#largePreviewImage {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  background: var(--color-overlay);
  border-radius: var(--radius-lg);
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

@media (min-width: 48rem) {
  .app-shell {
    padding-inline: var(--space-6);
  }

  .gallery-toolbar {
    grid-template-columns: 1fr auto;
    align-items: end;
  }
}

@media (min-width: 64rem) {
  .app-shell {
    padding-top: var(--space-8);
  }

  .hero {
    grid-template-columns: 7rem 1fr;
    padding-bottom: var(--space-10);
  }

  .hero__mark {
    width: 6.25rem;
  }

  .workspace {
    grid-template-columns: minmax(19rem, 25rem) 1fr;
    align-items: start;
  }

  .control-panel {
    position: sticky;
    top: var(--space-6);
  }

  .panel-card,
  .gallery-panel {
    padding: var(--space-6);
  }
}