:root {
  --ink: #142018;
  --muted: #4a5a52;
  --paper: #e8eee9;
  --panel: rgba(250, 252, 250, 0.88);
  --line: #b7c4bc;
  --accent: #0b6e4f;
  --accent-ink: #064833;
  --warn: #8a2e1a;
  --shadow: 0 18px 40px rgba(20, 32, 24, 0.08);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  background: var(--paper);
  line-height: 1.45;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 480px at 12% -8%, #c5ddd0 0%, transparent 55%),
    radial-gradient(700px 420px at 92% 8%, #d5e2c8 0%, transparent 50%),
    linear-gradient(165deg, #dfe8e2 0%, var(--paper) 48%, #dde6df 100%);
  pointer-events: none;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: linear-gradient(
      rgba(20, 32, 24, 0.035) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(20, 32, 24, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at center, #000 35%, transparent 80%);
}

.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(1.75rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) 0.5rem;
  animation: rise 0.7s var(--ease) both;
}

.brand {
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  font-optical-sizing: auto;
  font-weight: 650;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--accent-ink);
}

.hero h1 {
  margin: 0.55rem 0 0.4rem;
  font-family: "Fraunces", Georgia, serif;
  font-weight: 500;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  letter-spacing: -0.01em;
}

.lede {
  margin: 0;
  max-width: 38rem;
  color: var(--muted);
}

.stage {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem clamp(1rem, 4vw, 2rem) 2.5rem;
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 920px) {
  .stage {
    grid-template-columns: minmax(280px, 360px) 1fr;
    align-items: start;
  }
}

.controls {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 1rem 1rem 1.1rem;
  animation: rise 0.8s var(--ease) 0.08s both;
  backdrop-filter: blur(8px);
}

fieldset {
  border: 0;
  margin: 0 0 1rem;
  padding: 0;
}

legend {
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.65rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  margin-bottom: 0.75rem;
  font-size: 0.92rem;
}

label span em {
  font-style: normal;
  color: var(--muted);
  font-size: 0.85em;
}

label.check {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.15rem;
}

input[type="text"] {
  font-family: "Source Code Pro", ui-monospace, monospace;
  font-size: 0.9rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 2px;
}

input[type="text"]:focus,
button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, white);
  outline-offset: 1px;
}

input[type="color"] {
  width: 100%;
  height: 2.2rem;
  padding: 0.15rem;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
}

.opt-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem 0.75rem;
}

.opt-grid .wide {
  grid-column: 1 / -1;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

button {
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  border: 0;
  border-radius: 2px;
  padding: 0.55rem 1rem;
  cursor: pointer;
  background: var(--accent);
  color: #f4faf7;
  transition: transform 0.2s var(--ease), background 0.2s ease;
}

button:hover {
  background: var(--accent-ink);
}

button:active {
  transform: translateY(1px);
}

button.ghost {
  background: transparent;
  color: var(--accent-ink);
  border: 1px solid var(--line);
}

button:disabled {
  opacity: 0.55;
  cursor: wait;
}

#status {
  margin: 0;
  flex: 1 1 100%;
  font-size: 0.88rem;
  color: var(--muted);
  min-height: 1.2em;
}

#status.error {
  color: var(--warn);
}

.canvas {
  display: grid;
  gap: 1rem;
  animation: rise 0.85s var(--ease) 0.14s both;
}

@media (min-width: 640px) {
  .canvas {
    grid-template-columns: 1fr 1fr;
  }
}

figure {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 0.75rem;
  backdrop-filter: blur(8px);
}

figcaption {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.55rem;
  font-weight: 600;
}

.frame {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 340px;
  padding: 1.25rem;
  overflow: visible;
  /* Transparent — SVG has no fill; page atmosphere shows through. */
  background: transparent;
  border: 1px dashed color-mix(in srgb, var(--line) 80%, transparent);
}

.frame svg {
  max-width: none;
  width: auto;
  height: auto;
  background: transparent;
  /* Drawing units are SCALE=20; bump display so shade/halo read clearly. */
  zoom: 1.55;
  animation: fade-in 0.45s var(--ease) both;
}

@supports not (zoom: 1) {
  .frame svg {
    transform: scale(1.55);
    transform-origin: center center;
  }
}

@media (min-width: 640px) {
  .frame {
    min-height: 400px;
  }

  .frame svg {
    zoom: 1.7;
  }

  @supports not (zoom: 1) {
    .frame svg {
      transform: scale(1.7);
    }
  }
}

.frame.empty::before {
  content: "—";
  color: #9aaba1;
  font-size: 1.4rem;
}

.foot {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem) 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.foot a {
  color: var(--accent-ink);
}

.foot code {
  font-family: "Source Code Pro", ui-monospace, monospace;
  font-size: 0.86em;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}