:root {
  --bg: #f5efe3;
  --bg-deep: #ead9c4;
  --ink: #112121;
  --ink-soft: #3b5552;
  --panel: rgba(255, 250, 242, 0.88);
  --panel-strong: rgba(17, 33, 33, 0.93);
  --line: rgba(17, 33, 33, 0.12);
  --accent: #e38a48;
  --accent-deep: #c76423;
  --sage: #89a79d;
  --white: #fffdf8;
  --shadow: 0 20px 60px rgba(49, 42, 28, 0.14);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background:
    radial-gradient(circle at top left, rgba(227, 138, 72, 0.18), transparent 32%),
    radial-gradient(circle at bottom right, rgba(137, 167, 157, 0.25), transparent 28%),
    linear-gradient(180deg, #fff7ea 0%, var(--bg) 55%, #efe5d6 100%);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(17, 33, 33, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(17, 33, 33, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.25), transparent 80%);
}

a,
button,
input {
  font: inherit;
}

.page-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 22px 0 30px;
}

.hero {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1.6fr) minmax(260px, 0.8fr);
  align-items: end;
  margin-bottom: 18px;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 6vw, 5.2rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
  margin: 0 0 10px;
  max-width: 10ch;
}

.eyebrow,
.hero-note p,
.preview-note,
.field small,
.mode-note,
.unit-note,
.loading-indicator {
  font-family: "Azeret Mono", monospace;
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 16px;
  padding: 8px 12px;
  border: 1px solid rgba(17, 33, 33, 0.1);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.8);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lede,
.hero-note p,
.panel-header p,
.preview-note,
.mode-note,
.unit-note,
.field small {
  color: var(--ink-soft);
}

.lede {
  max-width: 52ch;
  font-size: 1rem;
  margin: 0;
}

.hero-note {
  padding: 15px 18px;
  border: 1px solid rgba(17, 33, 33, 0.1);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 248, 0.64);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-note p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
}

.hero-note p + p {
  margin-top: 8px;
}

.workspace {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
}

.panel {
  border: 1px solid rgba(17, 33, 33, 0.1);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  padding: 18px;
}

.control-panel {
  position: sticky;
  top: 20px;
  align-self: start;
}

.panel-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.panel-header h2 {
  margin: 0 0 6px;
  font-size: 1.35rem;
}

.panel-header p {
  margin: 0;
  max-width: 34ch;
}

.builder-form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span,
.mode-group legend,
.unit-group legend {
  font-weight: 700;
  font-size: 0.96rem;
}

.field input {
  width: 100%;
  border: 1px solid rgba(17, 33, 33, 0.14);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink);
  padding: 12px 14px;
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.field input:focus {
  outline: none;
  border-color: rgba(227, 138, 72, 0.95);
  box-shadow: 0 0 0 4px rgba(227, 138, 72, 0.16);
  transform: translateY(-1px);
}

.field small,
.mode-note,
.unit-note,
.preview-note,
.loading-indicator {
  font-size: 0.76rem;
  line-height: 1.5;
}

.mode-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.unit-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.choice-row {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 8px;
}

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

.unit-note {
  margin: 8px 0 0;
}

.choice {
  position: relative;
}

.choice input {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.choice span {
  display: block;
  border: 1px solid rgba(17, 33, 33, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  padding: 10px 10px;
  text-align: center;
  font-weight: 700;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.choice input:checked + span {
  border-color: rgba(227, 138, 72, 0.95);
  background: rgba(227, 138, 72, 0.14);
  transform: translateY(-1px);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button,
.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  text-decoration: none;
  padding: 11px 16px;
  font-weight: 700;
  border: 0;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  color: var(--white);
}

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

.secondary-button {
  background: rgba(17, 33, 33, 0.08);
  color: var(--ink);
}

.download-button {
  background: linear-gradient(135deg, #f2b15e 0%, #e38a48 52%, #c76423 100%);
  color: var(--white);
  box-shadow: 0 10px 28px rgba(227, 138, 72, 0.24);
}

.loading-indicator {
  opacity: 0;
}

.htmx-request .loading-indicator,
.htmx-request.loading-indicator {
  opacity: 1;
}

.preview-panel {
  background:
    linear-gradient(180deg, rgba(10, 20, 20, 0.98), rgba(18, 32, 32, 0.96)),
    radial-gradient(circle at top right, rgba(227, 138, 72, 0.16), transparent 20%);
  color: var(--white);
}

.preview-panel .panel-header h2,
.preview-panel .spec strong {
  color: var(--white);
}

.preview-panel .download-button {
  color: var(--white);
}

.preview-panel .panel-header,
.spec-grid,
.preview-note {
  position: relative;
  z-index: 1;
}

.preview-stage {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at top, rgba(227, 138, 72, 0.18), transparent 30%),
    linear-gradient(180deg, #213536 0%, #111d1d 100%);
}

.download-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 12px;
}

.viewer {
  position: relative;
  min-height: 360px;
}

.viewer canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewer-status,
.viewer-legend {
  position: absolute;
  left: 18px;
  border-radius: 999px;
  padding: 7px 10px;
  backdrop-filter: blur(10px);
  background: rgba(17, 33, 33, 0.56);
  color: var(--white);
  font-family: "Azeret Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  z-index: 2;
}

.viewer-status {
  top: 14px;
}

.viewer-legend {
  bottom: 14px;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.spec {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.spec-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
}

.preview-note {
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.78);
}

.error-card {
  border-radius: 18px;
  padding: 18px;
  background: rgba(227, 86, 72, 0.16);
  border: 1px solid rgba(227, 86, 72, 0.28);
}

.error-card p {
  margin: 0;
}

.error-card p + p {
  margin-top: 10px;
}

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

  .control-panel {
    position: static;
  }

  .hero-copy h1 {
    max-width: 12ch;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100vw - 20px, 1240px);
    padding-top: 14px;
  }

  .panel {
    padding: 16px;
  }

  .choice-row,
  .spec-grid {
    grid-template-columns: 1fr;
  }

  .viewer {
    min-height: 280px;
  }

  .panel-header {
    flex-direction: column;
  }

  .download-row {
    justify-content: stretch;
  }

  .download-row .download-button {
    width: 100%;
  }
}