:root {
  --bg: #f2ede3;
  --panel: rgba(255, 250, 242, 0.78);
  --panel-strong: rgba(255, 248, 236, 0.94);
  --ink: #18222d;
  --muted: #5f6b76;
  --line: rgba(24, 34, 45, 0.12);
  --accent: #d66b3d;
  --accent-deep: #9d3c18;
  --accent-soft: rgba(214, 107, 61, 0.14);
  --shadow: 0 24px 60px rgba(53, 41, 29, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(214, 107, 61, 0.28), transparent 28%),
    radial-gradient(circle at top right, rgba(70, 112, 128, 0.18), transparent 24%),
    linear-gradient(180deg, #f8f2e9 0%, var(--bg) 48%, #e8dfd2 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(24, 34, 45, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 34, 45, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 85%);
}

.page-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero,
.panel {
  backdrop-filter: blur(18px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  gap: 24px;
  grid-template-columns: 1.45fr 1fr;
  padding: 32px;
  border-radius: var(--radius-xl);
  animation: rise-in 700ms ease-out;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font: 600 0.78rem/1.2 "Trebuchet MS", sans-serif;
  color: var(--accent-deep);
}

.hero h1,
.panel h2,
.panel h3 {
  margin: 0;
  font-weight: 700;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 4.5rem);
  line-height: 0.95;
  max-width: 10ch;
}

.hero-text,
.panel-head p,
.formula-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-family: "Trebuchet MS", Arial, sans-serif;
}

.hero-copy {
  display: grid;
  gap: 14px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-content: start;
}

.stat-card,
.formula-card,
.canvas-card,
.mini-card,
.upload-zone {
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.stat-card {
  padding: 18px;
  display: grid;
  gap: 10px;
}

.stat-label {
  color: var(--muted);
  font: 600 0.76rem/1.2 "Trebuchet MS", sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stat-card strong {
  font-size: 1.35rem;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  margin-top: 20px;
}

.panel {
  border-radius: var(--radius-xl);
  padding: 24px;
}

.panel-head {
  display: grid;
  gap: 8px;
  margin-bottom: 20px;
}

.controls-panel {
  display: grid;
  gap: 18px;
  align-content: start;
}

.upload-zone {
  display: grid;
  gap: 8px;
  padding: 22px;
  min-height: 150px;
  align-content: center;
  text-align: center;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.upload-zone:hover,
.upload-zone:focus-within {
  transform: translateY(-2px);
  border-color: rgba(214, 107, 61, 0.38);
  background: #fffaf2;
}

.upload-zone input {
  display: none;
}

.upload-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.upload-subtitle {
  color: var(--muted);
  font-family: "Trebuchet MS", Arial, sans-serif;
}

.control-group {
  display: grid;
  gap: 10px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mode-pill {
  position: relative;
  display: block;
  cursor: pointer;
}

.mode-pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.mode-pill span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  font: 700 0.92rem/1 "Trebuchet MS", Arial, sans-serif;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.mode-pill:hover span {
  transform: translateY(-1px);
}

.mode-pill input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.mode-pill input:focus-visible + span {
  outline: 2px solid rgba(24, 34, 45, 0.4);
  outline-offset: 2px;
}

.control-label-row,
.card-top,
.button-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.control-label-row {
  font: 600 1rem/1.2 "Trebuchet MS", Arial, sans-serif;
}

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

.tick-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  color: var(--muted);
  font: 600 0.84rem/1.2 "Trebuchet MS", Arial, sans-serif;
}

.button-row {
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--accent);
  color: white;
  font: 700 0.95rem/1 "Trebuchet MS", Arial, sans-serif;
  cursor: pointer;
  transition: transform 180ms ease, opacity 180ms ease, background 180ms ease;
}

button:hover {
  transform: translateY(-1px);
  opacity: 0.96;
}

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

.formula-card {
  padding: 18px;
  display: grid;
  gap: 10px;
}

.viewer-grid,
.gallery-grid {
  display: grid;
  gap: 16px;
}

.viewer-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gallery-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.canvas-card,
.mini-card {
  padding: 16px;
  display: grid;
  gap: 12px;
  transform: translateY(12px);
  opacity: 0;
  animation: card-in 520ms ease-out forwards;
}

.active-card {
  box-shadow: inset 0 0 0 1px rgba(214, 107, 61, 0.28);
}

.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(24, 34, 45, 0.08);
  color: var(--muted);
  font: 700 0.76rem/1 "Trebuchet MS", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tag.accent {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

canvas {
  width: 100%;
  display: block;
  border-radius: var(--radius-md);
  background:
    linear-gradient(45deg, rgba(24, 34, 45, 0.05) 25%, transparent 25%, transparent 75%, rgba(24, 34, 45, 0.05) 75%),
    linear-gradient(45deg, rgba(24, 34, 45, 0.05) 25%, transparent 25%, transparent 75%, rgba(24, 34, 45, 0.05) 75%);
  background-position: 0 0, 12px 12px;
  background-size: 24px 24px;
  aspect-ratio: 4 / 3;
}

.mini-canvas {
  aspect-ratio: 4 / 3;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1040px) {
  .hero,
  .layout,
  .viewer-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100vw - 20px, 1240px);
    padding: 16px 0 28px;
  }

  .hero,
  .panel {
    padding: 18px;
  }

  .hero h1 {
    max-width: none;
  }

  .hero-stats,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .mode-toggle {
    grid-template-columns: 1fr;
  }
}