:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5b6472;
  --soft: #f5f7fb;
  --panel: #ffffff;
  --line: #dce3ee;
  --line-strong: #b8c4d6;
  --blue: #2563eb;
  --blue-strong: #1d4ed8;
  --teal: #0f9f8f;
  --amber: #f59e0b;
  --violet: #7c3aed;
  --rose: #e11d48;
  --green: #16a34a;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px),
    linear-gradient(rgba(15, 159, 143, 0.05) 1px, transparent 1px),
    var(--soft);
  background-size: 24px 24px;
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-200%);
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  padding: 0.65rem 0.85rem;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(184, 196, 214, 0.7);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(16px);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.header-inner {
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.08rem;
  font-weight: 800;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border: 2px solid var(--ink);
  background:
    linear-gradient(90deg, var(--blue) 0 25%, var(--amber) 25% 50%, var(--teal) 50% 75%, var(--rose) 75% 100%);
  box-shadow: 4px 4px 0 var(--ink);
  image-rendering: pixelated;
}

.main-nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
}

.main-nav a:hover,
.site-footer a:hover {
  color: var(--blue);
}

.tool-hero {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.hero-copy {
  display: grid;
  gap: 0.75rem;
  max-width: 840px;
  margin-bottom: 1.4rem;
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--blue-strong);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 5vw, 4.8rem);
  line-height: 0.97;
  letter-spacing: 0;
}

.hero-text {
  max-width: 780px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.65;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 1rem;
  align-items: start;
}

.preview-panel,
.control-panel,
.content-section article,
.legal-shell {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.preview-panel,
.control-panel {
  padding: 1rem;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.panel-header.compact {
  margin-bottom: 0.8rem;
}

.panel-header h2 {
  margin: 0.15rem 0 0;
  font-size: 1.2rem;
  line-height: 1.2;
}

.action-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.primary-button,
.icon-button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-weight: 780;
}

.primary-button {
  min-width: 118px;
  background: var(--ink);
  color: #fff;
  padding: 0.65rem 1rem;
}

.primary-button:hover {
  background: var(--blue-strong);
}

.primary-button:disabled {
  cursor: not-allowed;
  background: #94a3b8;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 42px;
  background: #fff;
  color: var(--ink);
  border-color: var(--line-strong);
  font-size: 1.1rem;
}

.icon-button:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.canvas-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.canvas-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  background:
    linear-gradient(45deg, #eef2f7 25%, transparent 25% 75%, #eef2f7 75%),
    linear-gradient(45deg, #eef2f7 25%, transparent 25% 75%, #eef2f7 75%);
  background-color: #fff;
  background-position: 0 0, 10px 10px;
  background-size: 20px 20px;
}

.canvas-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  padding: 0.6rem 0.75rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.canvas-label output {
  font-variant-numeric: tabular-nums;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  min-height: 240px;
  background: transparent;
  image-rendering: pixelated;
}

.upload-zone {
  display: grid;
  place-items: center;
  gap: 0.35rem;
  min-height: 170px;
  margin-top: 0.8rem;
  border: 2px dashed var(--line-strong);
  border-radius: 8px;
  background: #f8fbff;
  color: var(--muted);
  text-align: center;
  transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.upload-zone input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

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

.upload-zone small {
  display: block;
  max-width: 390px;
  line-height: 1.45;
}

.upload-zone.is-dragging,
.upload-zone:hover {
  border-color: var(--blue);
  background: #eff6ff;
  transform: translateY(-1px);
}

.status-message {
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #f8fafc;
  color: var(--muted);
  padding: 0.55rem 0.7rem;
  font-size: 0.88rem;
  font-weight: 650;
  line-height: 1.45;
}

.status-message[data-tone="success"] {
  border-color: rgba(22, 163, 74, 0.35);
  background: #f0fdf4;
  color: #166534;
}

.status-message[data-tone="warning"] {
  border-color: rgba(245, 158, 11, 0.45);
  background: #fffbeb;
  color: #92400e;
}

.status-message[data-tone="error"] {
  border-color: rgba(225, 29, 72, 0.35);
  background: #fff1f2;
  color: #9f1239;
}

.upload-icon {
  width: 46px;
  height: 46px;
  border: 2px solid var(--ink);
  background:
    linear-gradient(90deg, var(--green) 0 33%, transparent 33%),
    linear-gradient(0deg, var(--amber) 0 35%, transparent 35%),
    var(--panel);
  box-shadow: 4px 4px 0 rgba(17, 24, 39, 0.16);
}

.demo-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
  margin-bottom: 0.9rem;
}

.demo-thumb {
  min-height: 74px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background-size: cover;
  image-rendering: pixelated;
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.demo-thumb:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.demo-sunset {
  background:
    radial-gradient(circle at 70% 24%, #fff4b8 0 10%, transparent 11%),
    linear-gradient(#f97316 0 36%, #ef4444 36% 52%, #7c3aed 52% 68%, #1e293b 68%);
}

.demo-orbit {
  background:
    radial-gradient(circle at 62% 32%, #dbeafe 0 8%, transparent 9%),
    radial-gradient(circle at 42% 54%, #22d3ee 0 14%, #2563eb 15% 23%, transparent 24%),
    linear-gradient(135deg, #111827, #312e81 52%, #0f172a);
}

.demo-garden {
  background:
    linear-gradient(90deg, transparent 0 20%, #854d0e 20% 27%, transparent 27% 55%, #854d0e 55% 62%, transparent 62%),
    radial-gradient(circle at 28% 42%, #f43f5e 0 8%, transparent 9%),
    radial-gradient(circle at 62% 36%, #f59e0b 0 8%, transparent 9%),
    linear-gradient(#bfdbfe 0 48%, #22c55e 48%);
}

.control-stack {
  display: grid;
  gap: 0.85rem;
}

.control {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 720;
}

.range-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  gap: 0.55rem;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  padding: 0.55rem 0.65rem;
}

output {
  color: var(--ink);
  text-align: right;
  font-size: 0.85rem;
  font-weight: 800;
}

.toggle-grid,
.split-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.toggle-control {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  padding: 0.5rem 0.6rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 720;
}

.toggle-control input {
  accent-color: var(--blue);
}

.content-section {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3.4rem 0;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 1.4rem;
  text-align: center;
}

.section-heading h2 {
  margin: 0.35rem 0 0.55rem;
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.section-heading p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.65;
}

.feature-grid,
.faq-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

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

.content-section article {
  padding: 1.25rem;
}

.content-section h3 {
  margin: 0.8rem 0 0.45rem;
  font-size: 1rem;
  line-height: 1.25;
}

.content-section p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.feature-icon {
  display: inline-block;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(17, 24, 39, 0.13);
}

.palette-icon {
  background: linear-gradient(90deg, var(--blue) 0 25%, var(--teal) 25% 50%, var(--amber) 50% 75%, var(--rose) 75%);
}

.dither-icon {
  background:
    radial-gradient(circle, var(--violet) 0 2px, transparent 3px),
    #fff;
  background-size: 10px 10px;
}

.export-icon {
  background:
    linear-gradient(90deg, transparent 44%, var(--ink) 44% 56%, transparent 56%),
    linear-gradient(0deg, var(--green) 0 34%, #fff 34%);
}

.lock-icon {
  background:
    linear-gradient(90deg, transparent 25%, var(--ink) 25% 75%, transparent 75%) center 9px / 28px 16px no-repeat,
    linear-gradient(var(--blue) 0 100%) center 24px / 30px 18px no-repeat,
    #fff;
}

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

.steps-grid article span {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-weight: 850;
}

.site-footer {
  background: var(--ink);
  color: #dbe4ef;
}

.footer-inner {
  padding: 2rem 0;
}

.site-footer p {
  margin: 0.3rem 0 0;
  color: #98a6b9;
}

.legal-page {
  background: var(--soft);
}

.legal-shell {
  width: min(780px, calc(100% - 2rem));
  margin: 3rem auto;
  padding: 2rem;
}

.legal-shell h1 {
  margin: 1rem 0;
  font-size: 2.2rem;
}

.legal-shell h2 {
  margin-top: 1.4rem;
}

.legal-shell p {
  color: var(--muted);
  line-height: 1.7;
}

.back-link {
  color: var(--blue);
  font-weight: 780;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .control-panel {
    order: -1;
  }

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

@media (max-width: 720px) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 0.8rem 0;
  }

  .main-nav,
  .site-footer nav {
    flex-wrap: wrap;
  }

  .tool-hero {
    padding-top: 1.4rem;
  }

  .canvas-grid,
  .feature-grid,
  .steps-grid,
  .faq-grid,
  .toggle-grid,
  .split-controls {
    grid-template-columns: 1fr;
  }

  .panel-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .action-row {
    width: 100%;
  }

  .primary-button {
    flex: 1;
  }

}