:root {
  --cream:      #f5efe6;
  --cream-2:    #efe7d9;
  --ink:        #2c2320;
  --ink-soft:   #5a4f4a;
  --espresso:   #3a2f2b;
  --brass:      #b08d57;
  --bronze:     #8c6e3f;
  --glass:      rgba(255, 252, 247, 0.72);
  --border:     rgba(176, 141, 87, 0.28);
  --shadow-sm:  0 2px 6px rgba(44, 35, 32, 0.06);
  --shadow-md:  0 10px 30px rgba(44, 35, 32, 0.10);
  --shadow-glow: 0 0 0 1px rgba(176, 141, 87, 0.25), 0 8px 28px rgba(176, 141, 87, 0.18);
  --radius:     14px;
  --serif:      "Cormorant Garamond", Georgia, serif;
  --sans:       "Inter", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100svh;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 15% -10%, rgba(176, 141, 87, 0.14), transparent 60%),
    radial-gradient(900px 460px at 90% 110%, rgba(176, 141, 87, 0.10), transparent 55%),
    var(--cream);
  padding: 1rem clamp(1rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ---- header ---- */
header {
  text-align: center;
  margin-bottom: 1.75rem;
}

header h1 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 3.25rem);
  letter-spacing: 0.01em;
  margin: 0;
  background: linear-gradient(120deg, var(--espresso), var(--bronze) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

header p {
  margin: 0.4rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ---- toolbar ---- */
.toolbar {
  align-items: flex-end;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 1.75rem;
  gap: 1.5rem;
  max-width: 100%;
}

.t-group {
  display: row;
  flex-direction: column;
  gap: 0.35rem;
}

.t-group label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.t-divider {
  align-self: stretch;
  width: 1px;
  margin: 0.25rem 0;
  background: linear-gradient(180deg, transparent, var(--border), transparent);
}

/* ---- selects ---- */
select {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--sans);
  font-size: 0.83rem;
  color: var(--espresso);
  background:
    linear-gradient(45deg, transparent 50%, var(--bronze) 50%) calc(100% - 14px) 50% / 6px 6px no-repeat,
    linear-gradient(135deg, var(--bronze) 50%, transparent 50%) calc(100% - 9px) 50% / 6px 6px no-repeat,
    rgba(255, 253, 249, 0.9);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 2rem 0.45rem 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

select:hover { border-color: rgba(176, 141, 87, 0.55); }

select:focus-visible {
  border-color: var(--brass);
  box-shadow: var(--shadow-glow);
}

/* ---- buttons ---- */
button {
  font-family: var(--sans);
  font-size: 0.83rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cream);
  background: var(--espresso);
  border: 1px solid var(--espresso);
  border-radius: 999px;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease,
              box-shadow 0.2s ease, transform 0.15s ease;
}

button:hover {
  background: var(--bronze);
  border-color: var(--bronze);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

button:active { transform: translateY(0); }

button:focus-visible {
  outline: none;
  box-shadow: var(--shadow-glow);
}

/* ---- range sliders ---- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 150px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brass), var(--bronze));
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--bronze);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: var(--shadow-glow);
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--bronze);
  box-shadow: var(--shadow-sm);
}

/* ---- canvas grid ---- */
.canvas-grid {
  flex: 0 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
  max-width: 920px;
  margin: 1.5rem auto 0;
}

.card {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem;
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.6);
  animation: fade-in 0.7s ease both;
}

.card:nth-child(2) { animation-delay: 0.08s; }
.card:nth-child(3) { animation-delay: 0.16s; }

.card canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--ink);
}

.card-label {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--ink-soft);
  margin: 0.55rem 0 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
}

/* ---- shader card ---- */
details.shaders {
  width: 100%;
  max-width: 920px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  box-shadow: var(--shadow-sm);
}

details.shaders summary {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--espresso);
  cursor: pointer;
  user-select: none;
}

details.shaders summary:hover { color: var(--bronze); }

.shader-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.shader-col {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.shader-col label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

textarea {
  width: 100%;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--ink);
  background: rgba(255, 253, 249, 0.85);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  resize: vertical;
  min-height: 14rem;
  outline: none;
  box-sizing: border-box;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea:focus {
  border-color: var(--brass);
  box-shadow: var(--shadow-glow);
}

@media (max-width: 720px) {
  .shader-row { grid-template-columns: 1fr; }
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}