:root {
  --ink: #12151a;
  --ink-2: #181c23;
  --panel: #1d2129;
  --panel-2: #242833;
  --paper: #f6f4ef;
  --steel: #8a93a6;
  --steel-dim: #5b6376;
  --teal: #35d9a6;
  --teal-dim: #23a37c;
  --magenta: #ff5da2;
  --border: #2a2f3a;
  --radius: 14px;
  --checker-a: #262b34;
  --checker-b: #1c2027;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  background: var(--ink);
  color: var(--paper);
  font-family: "Inter", sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
.display {
  font-family: "Space Grotesk", sans-serif;
}
.mono {
  font-family: "JetBrains Mono", monospace;
}
a {
  color: inherit;
}
button {
  font-family: inherit;
}

/* ---------- Header ---------- */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 40px;
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 5;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background-image:
    linear-gradient(45deg, var(--ink) 25%, transparent 25%),
    linear-gradient(-45deg, var(--ink) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--ink) 75%),
    linear-gradient(-45deg, transparent 75%, var(--ink) 75%);
  background-size: 10px 10px;
  background-position:
    0 0,
    0 5px,
    5px -5px,
    -5px 0;
  background-color: var(--teal);
  flex-shrink: 0;
}
header .tag {
  color: var(--steel);
  font-size: 13px;
  font-family: "JetBrains Mono", monospace;
}
header nav {
  display: flex;
  gap: 8px;
}
.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--paper);
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 13.5px;
  cursor: pointer;
  transition:
    border-color 0.15s ease,
    color 0.15s ease;
}
.ghost-btn:hover {
  border-color: var(--teal);
  color: var(--teal);
}

/* ---------- Hero ---------- */
#hero {
  position: relative;
  padding: 72px 24px 90px;
  text-align: center;
  overflow: hidden;
}
#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 34px 34px;
  background-position:
    0 0,
    0 17px,
    17px -17px,
    -17px 0;
  -webkit-mask-image: radial-gradient(
    ellipse 70% 55% at 50% 0%,
    black 0%,
    transparent 70%
  );
  mask-image: radial-gradient(
    ellipse 70% 55% at 50% 0%,
    black 0%,
    transparent 70%
  );
  opacity: 0.6;
  pointer-events: none;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--teal);
  font-family: "JetBrains Mono", monospace;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--teal-dim);
  border-radius: 999px;
  padding: 6px 14px;
  position: relative;
  margin-bottom: 26px;
}
#hero h1 {
  position: relative;
  font-size: clamp(32px, 5.2vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 700;
  max-width: 820px;
  margin: 0 auto 18px;
}
#hero h1 span {
  color: var(--teal);
}
#hero p.sub {
  position: relative;
  color: var(--steel);
  font-size: 17px;
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.55;
}

.dropzone {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
  border: 1.5px dashed var(--steel-dim);
  border-radius: 20px;
  padding: 44px 28px;
  background: var(--panel);
  cursor: pointer;
  transition:
    border-color 0.18s ease,
    background 0.18s ease,
    transform 0.18s ease;
}
.dropzone:hover {
  border-color: var(--teal);
  transform: translateY(-2px);
}
.dropzone.drag {
  border-color: var(--teal);
  background: var(--panel-2);
}
.dropzone svg {
  width: 40px;
  height: 40px;
  color: var(--teal);
  margin-bottom: 14px;
}
.dropzone .dz-title {
  font-weight: 600;
  font-size: 16.5px;
  margin-bottom: 6px;
}
.dropzone .dz-sub {
  color: var(--steel);
  font-size: 13.5px;
}

.feature-row {
  position: relative;
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 900px;
  margin: 46px auto 0;
}
.feature-card {
  flex: 1 1 220px;
  max-width: 260px;
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 20px;
}
.feature-card .ico {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(53, 217, 166, 0.12);
  color: var(--teal);
}
.feature-card h3 {
  font-size: 14.5px;
  margin: 0 0 6px;
  font-weight: 600;
}
.feature-card p {
  font-size: 13px;
  color: var(--steel);
  margin: 0;
  line-height: 1.5;
}

/* ---------- Editor ---------- */
#editor {
  display: none;
}
#editor.active {
  display: block;
}

.toolbar-top {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--ink-2);
  position: sticky;
  top: 0;
  z-index: 10;
}
.file-tag {
  color: var(--steel);
  font-size: 12.5px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-right: auto;
  white-space: nowrap;
}
.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--paper);
  padding: 8px 13px;
  border-radius: 9px;
  font-size: 13px;
  cursor: pointer;
  transition:
    border-color 0.15s ease,
    opacity 0.15s;
}
.icon-btn:hover {
  border-color: var(--steel);
}
.icon-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.icon-btn svg {
  width: 15px;
  height: 15px;
}
.icon-btn.primary {
  background: var(--teal);
  border-color: var(--teal);
  color: #08201a;
  font-weight: 600;
}
.icon-btn.primary:hover {
  background: var(--teal-dim);
}
.bg-swatches {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-right: 6px;
}
.swatch {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  border: 1.5px solid var(--border);
  cursor: pointer;
  padding: 0;
}
.swatch.checker {
  background-image:
    linear-gradient(45deg, #555 25%, transparent 25%),
    linear-gradient(-45deg, #555 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #555 75%),
    linear-gradient(-45deg, transparent 75%, #555 75%);
  background-size: 8px 8px;
  background-position:
    0 0,
    0 4px,
    4px -4px,
    -4px 0;
  background-color: #eee;
}
.swatch.white {
  background: #fff;
}
.swatch.black {
  background: #000;
}
.swatch.active {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.workspace {
  display: flex;
  align-items: stretch;
  min-height: calc(100vh - 130px);
}
.panel-left {
  width: 290px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--ink-2);
  padding: 20px;
  overflow-y: auto;
}
.mode-tabs {
  display: flex;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 4px;
  border-radius: 11px;
  margin-bottom: 22px;
}
.mode-tab {
  flex: 1;
  text-align: center;
  padding: 9px 8px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  color: var(--steel);
  background: transparent;
  border: none;
  transition: all 0.15s ease;
}
.mode-tab.active {
  background: var(--teal);
  color: #08201a;
}

.panel-section {
  margin-bottom: 24px;
}
.panel-section > label.title {
  display: block;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel);
  margin-bottom: 12px;
  font-weight: 600;
}
.slider-row {
  margin-bottom: 16px;
}
.slider-row .slabel {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 8px;
}
.slider-row .slabel span.val {
  color: var(--teal);
  font-family: "JetBrains Mono", monospace;
}
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--teal);
  cursor: pointer;
  border: 2px solid var(--ink-2);
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--teal);
  cursor: pointer;
  border: 2px solid var(--ink-2);
}
.helper {
  font-size: 12.5px;
  color: var(--steel);
  line-height: 1.55;
  margin-top: 2px;
}
.run-btn {
  width: 100%;
  padding: 13px;
  border-radius: 10px;
  border: none;
  background: var(--teal);
  color: #08201a;
  font-weight: 700;
  font-size: 14.5px;
  cursor: pointer;
  margin-top: 6px;
  transition:
    background 0.15s ease,
    transform 0.1s ease;
}
.run-btn:hover {
  background: var(--teal-dim);
}
.run-btn:active {
  transform: scale(0.98);
}
.run-btn.processing {
  opacity: 0.7;
  cursor: wait;
}

.tool-grid {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}
.tool-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 6px;
  cursor: pointer;
  color: var(--steel);
  font-size: 11.5px;
  transition:
    border-color 0.15s ease,
    color 0.15s ease;
}
.tool-btn svg {
  width: 18px;
  height: 18px;
}
.tool-btn.active {
  border-color: var(--magenta);
  color: var(--magenta);
  background: rgba(255, 93, 162, 0.08);
}

.stage-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 34px;
  position: relative;
  background: var(--ink);
}
.stage {
  position: relative;
  display: inline-block;
  line-height: 0;
  box-shadow:
    0 0 0 1px var(--border),
    0 20px 60px rgba(0, 0, 0, 0.4);
  background-image:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 20px 20px;
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-color: var(--checker-b);
}
.stage.bg-white {
  background: #fff;
}
.stage.bg-black {
  background: #000;
}
#viewCanvas {
  display: block;
  image-rendering: pixelated;
  touch-action: none;
}
#viewCanvas.manual-cursor {
  cursor: none;
}
#viewCanvas.wand-cursor {
  cursor: crosshair;
}

.brush-cursor {
  position: fixed;
  pointer-events: none;
  border: 1.5px solid var(--magenta);
  border-radius: 50%;
  background: rgba(255, 93, 162, 0.12);
  transform: translate(-50%, -50%);
  display: none;
  z-index: 50;
}

.zoom-group {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 3px;
}
.zoom-group button {
  background: transparent;
  border: none;
  color: var(--paper);
  padding: 6px 9px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12.5px;
}
.zoom-group button:hover {
  background: var(--panel-2);
}
.zoom-group span {
  font-size: 12px;
  color: var(--steel);
  padding: 0 4px;
  font-family: "JetBrains Mono", monospace;
  min-width: 40px;
  text-align: center;
}

footer {
  text-align: center;
  padding: 26px 20px;
  color: var(--steel-dim);
  font-size: 12.5px;
  border-top: 1px solid var(--border);
}

@media (max-width: 860px) {
  .workspace {
    flex-direction: column;
  }
  .panel-left {
    width: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  header {
    padding: 16px 18px;
  }
  #hero {
    padding: 52px 18px 60px;
  }
}
#fileInput {
  display: none;
}