:root {
  --bg: #f0eadf;
  --bg-deep: #d6d4c7;
  --panel: rgba(255, 252, 246, 0.84);
  --panel-strong: rgba(250, 246, 238, 0.96);
  --line: rgba(31, 53, 79, 0.12);
  --ink: #16314d;
  --ink-soft: rgba(22, 49, 77, 0.72);
  --accent: #d5692f;
  --accent-dark: #a74a1e;
  --shadow: 0 26px 60px rgba(37, 48, 63, 0.16);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Aptos", "Segoe UI Variable Display", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(212, 122, 54, 0.18), transparent 30%),
    radial-gradient(circle at right 20%, rgba(38, 96, 146, 0.14), transparent 24%),
    linear-gradient(135deg, #efe9dc 0%, #ece7db 45%, #d7d9d6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(22, 49, 77, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 49, 77, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, black 50%, transparent 100%);
}

.page-shell {
  width: min(1400px, calc(100vw - 32px));
  margin: 28px auto 48px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 20px;
  margin-bottom: 24px;
}

.hero-copy,
.hero-card,
.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 34px 36px;
}

.eyebrow,
.panel-kicker,
.hero-card-label {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.74rem;
  color: var(--accent-dark);
  font-weight: 800;
}

.hero h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 0.95;
  max-width: 12ch;
}

.lede {
  margin: 18px 0 0;
  max-width: 66ch;
  line-height: 1.65;
  color: var(--ink-soft);
}

.hero-card {
  padding: 28px;
  align-self: stretch;
  background:
    linear-gradient(180deg, rgba(255, 249, 239, 0.95), rgba(243, 236, 225, 0.92));
}

.hero-card ul {
  margin: 0;
  padding-left: 18px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.workspace {
  display: grid;
  gap: 24px;
}

.panel {
  padding: 28px;
}

.panel-heading h2 {
  margin: 0;
  font-size: 1.7rem;
}

.panel-heading.split {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
}

.view-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.upload-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid rgba(22, 49, 77, 0.08);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.upload-card:hover {
  transform: translateY(-2px);
  border-color: rgba(213, 105, 47, 0.4);
  box-shadow: 0 18px 34px rgba(28, 48, 72, 0.12);
}

.upload-card input[type="file"] {
  width: 100%;
}

.upload-tag {
  font-weight: 700;
  font-size: 1rem;
}

.upload-hint {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.upload-card canvas,
.mask-card canvas {
  width: 100%;
  height: auto;
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(32, 66, 104, 0.06), rgba(213, 105, 47, 0.09));
  border: 1px dashed rgba(22, 49, 77, 0.12);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.setting {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: 20px;
  background: var(--panel-strong);
  border: 1px solid rgba(22, 49, 77, 0.08);
}

.setting.checkbox {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
}

.setting span {
  font-weight: 700;
}

.setting strong {
  font-size: 1.15rem;
}

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

select,
button,
input[type="file"] {
  font: inherit;
}

.action-row,
.download-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.primary-button,
.secondary-button {
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent), #e5954d);
  color: #fff8f2;
  box-shadow: 0 18px 34px rgba(213, 105, 47, 0.28);
}

.secondary-button {
  background: linear-gradient(135deg, rgba(28, 69, 108, 0.92), rgba(47, 96, 145, 0.88));
  color: white;
  box-shadow: 0 16px 30px rgba(30, 62, 96, 0.24);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled,
.secondary-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
  transform: none;
  box-shadow: none;
}

.status-text {
  margin: 0;
  color: var(--ink-soft);
}

.controls-note,
.mask-report {
  margin: 16px 0 0;
  color: var(--ink-soft);
  line-height: 1.55;
}

.mask-report {
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--panel-strong);
  border: 1px solid rgba(22, 49, 77, 0.08);
}

.metric-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.metric {
  min-width: 132px;
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--panel-strong);
  border: 1px solid rgba(22, 49, 77, 0.08);
}

.metric-label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.metric strong {
  display: block;
  margin-top: 6px;
  font-size: 1.25rem;
}

.preview-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(220px, 0.7fr);
  gap: 20px;
  margin-top: 22px;
}

.viewer-card {
  padding: 18px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(250, 247, 240, 0.96), rgba(234, 238, 242, 0.88));
  border: 1px solid rgba(22, 49, 77, 0.08);
}

#viewerCanvas {
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(247, 240, 229, 0.95), rgba(211, 223, 234, 0.92));
  cursor: grab;
}

#viewerCanvas.dragging {
  cursor: grabbing;
}

.viewer-help {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.mask-column {
  display: grid;
  gap: 14px;
}

.mask-card {
  padding: 16px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid rgba(22, 49, 77, 0.08);
}

.mask-card span {
  display: inline-block;
  margin-bottom: 10px;
  font-weight: 700;
}

code {
  padding: 1px 5px;
  border-radius: 6px;
  background: rgba(22, 49, 77, 0.08);
}

@media (max-width: 1080px) {
  .hero,
  .preview-layout,
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .panel-heading.split {
    flex-direction: column;
  }
}

@media (max-width: 820px) {
  .page-shell {
    width: min(100vw - 20px, 1400px);
    margin-top: 14px;
  }

  .hero-copy,
  .hero-card,
  .panel {
    padding: 22px;
  }

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