:root {
  --bg: #f6f1e8;
  --panel: rgba(255, 251, 245, 0.88);
  --panel-border: rgba(34, 36, 38, 0.1);
  --text: #1d1b19;
  --muted: #6f675e;
  --accent: #d95d39;
  --accent-dark: #ab4224;
  --secondary: #1f4d3d;
  --shadow: 0 24px 60px rgba(88, 53, 20, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(217, 93, 57, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(31, 77, 61, 0.16), transparent 22%),
    linear-gradient(180deg, #efe4d4 0%, var(--bg) 42%, #efe7da 100%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero {
  padding: 12px 4px 24px;
}

.eyebrow {
  margin: 0 0 10px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.hero h1,
.section-heading h2 {
  margin: 0;
  line-height: 1;
}

.hero h1 {
  max-width: 900px;
  font-size: clamp(2.4rem, 6vw, 5.3rem);
}

.hero-copy {
  max-width: 680px;
  margin: 18px 0 0;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.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;
}

.tab-bar {
  display: flex;
  gap: 10px;
  padding: 10px;
  margin-bottom: 20px;
}

.seo-intro,
.seo-content,
.faq-section {
  margin-bottom: 20px;
  padding: 24px;
}

.seo-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.tab-button {
  flex: 1;
  min-height: 52px;
  border-radius: 18px;
  background: transparent;
  color: var(--text);
  border: 1px solid transparent;
}

.tab-button.is-active {
  background: rgba(29, 27, 25, 0.08);
  border-color: rgba(29, 27, 25, 0.1);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.controls {
  padding: 24px;
}

.dropzone {
  position: relative;
  overflow: hidden;
  border: 2px dashed rgba(29, 27, 25, 0.2);
  border-radius: var(--radius-lg);
  padding: 28px;
  cursor: pointer;
  background:
    linear-gradient(135deg, rgba(217, 93, 57, 0.08), rgba(31, 77, 61, 0.08)),
    rgba(255, 255, 255, 0.78);
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background:
    linear-gradient(135deg, rgba(217, 93, 57, 0.14), rgba(31, 77, 61, 0.12)),
    rgba(255, 255, 255, 0.92);
  outline: none;
}

.dropzone-content {
  display: grid;
  gap: 8px;
  justify-items: center;
  text-align: center;
}

.dropzone-content h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.3rem);
}

.dropzone-content p {
  margin: 0;
  color: var(--muted);
}

.dropzone-badge {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(29, 27, 25, 0.08);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.sprite-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 0.95rem;
  font-weight: 500;
}

.field-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.info-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  min-width: 20px;
  height: 20px;
  min-height: 20px;
  padding: 0;
  border-radius: 999px;
  background: rgba(29, 27, 25, 0.08);
  color: var(--accent-dark);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  line-height: 1;
}

.info-trigger::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%) translateY(4px);
  width: min(240px, 70vw);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(29, 27, 25, 0.94);
  color: #fff7ef;
  font-size: 0.8rem;
  line-height: 1.5;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.18);
}

.info-trigger:hover::after,
.info-trigger:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.info-trigger:focus-visible {
  outline: 2px solid rgba(217, 93, 57, 0.35);
  outline-offset: 2px;
}

.field select,
.field input {
  width: 100%;
  min-height: 48px;
  border: 1px solid rgba(29, 27, 25, 0.14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  padding: 0 14px;
}

.field input[type="color"] {
  padding: 6px;
}

.action-row,
.status-bar,
.section-heading,
.card-actions,
.canvas-pair {
  display: flex;
  align-items: center;
}

.action-row {
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

button {
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    background 180ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.primary {
  background: var(--accent);
  color: #fff7ef;
}

.secondary {
  background: var(--secondary);
  color: #f5f3eb;
}

.ghost {
  background: rgba(29, 27, 25, 0.08);
  color: var(--text);
}

.status-bar {
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.results {
  margin-top: 20px;
  padding: 24px;
}

.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.seo-grid article {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(29, 27, 25, 0.08);
  background: rgba(255, 255, 255, 0.7);
}

.seo-grid h3,
.faq-list summary {
  margin: 0;
}

.seo-grid p,
.faq-list p {
  color: var(--muted);
  line-height: 1.7;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(29, 27, 25, 0.08);
  background: rgba(255, 255, 255, 0.72);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
}

.site-footer {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto 40px;
  color: var(--muted);
  text-align: center;
}

.sheet-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.section-heading {
  justify-content: space-between;
  margin-bottom: 18px;
}

.empty-state {
  padding: 26px;
  border-radius: var(--radius-lg);
  text-align: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.6);
  border: 1px dashed rgba(29, 27, 25, 0.12);
}

.results-grid,
.frame-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.result-card,
.frame-card {
  display: grid;
  gap: 16px;
  padding: 16px;
  border: 1px solid rgba(29, 27, 25, 0.08);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.84);
}

.canvas-pair {
  gap: 12px;
  align-items: flex-start;
}

.canvas-pair > div {
  flex: 1;
}

.canvas-pair p {
  margin: 0 0 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.source-preview,
.pixel-preview,
.frame-preview,
.sheet-preview-canvas {
  width: 100%;
  border-radius: 16px;
  background:
    linear-gradient(45deg, #d9d3cb 25%, transparent 25%),
    linear-gradient(-45deg, #d9d3cb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #d9d3cb 75%),
    linear-gradient(-45deg, transparent 75%, #d9d3cb 75%);
  background-size: 16px 16px;
  background-position:
    0 0,
    0 8px,
    8px -8px,
    -8px 0;
  border: 1px solid rgba(29, 27, 25, 0.08);
}

.source-preview,
.pixel-preview,
.frame-preview {
  aspect-ratio: 1;
  object-fit: cover;
}

.pixel-preview,
.sheet-preview-canvas,
.frame-preview {
  image-rendering: pixelated;
}

.card-meta {
  display: grid;
  gap: 6px;
}

.card-meta strong {
  font-size: 1rem;
}

.card-meta span {
  color: var(--muted);
  font-size: 0.9rem;
}

.card-actions {
  justify-content: flex-end;
}

.sheet-preview-wrap {
  overflow: auto;
  border-radius: 20px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(29, 27, 25, 0.08);
}

@media (max-width: 1080px) {
  .sprite-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .sheet-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 920px) {
  .settings-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sprite-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 20px, 1200px);
    padding-top: 24px;
  }

  .controls,
  .results {
    padding: 18px;
  }

  .settings-grid,
  .sprite-grid {
    grid-template-columns: 1fr;
  }

  .status-bar,
  .canvas-pair,
  .tab-bar {
    display: grid;
  }
}