:root {
  --ink: #1b1917;
  --muted: #5f5a52;
  --bg: #f4efe6;
  --card: #fffdf8;
  --line: #e6dac6;
  --brand: #bc4a2f;
  --brand-soft: #f1b37b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #f8d8ab 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 100%, #e7c8b8 0%, transparent 45%),
    var(--bg);
}

.wrap {
  max-width: 980px;
  margin: 2rem auto;
  padding: 0 1rem 2rem;
}

.card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 20px;
  box-shadow: 0 20px 45px rgba(107, 78, 46, 0.14);
  overflow: hidden;
}

.hero {
  padding: 1.3rem 1.5rem;
  color: #fff;
  background: linear-gradient(125deg, #b5442c 0%, #dc8a4d 100%);
}

.eyebrow {
  margin: 0;
  opacity: 0.9;
  letter-spacing: 0.09em;
}

h1 {
  margin: 0.2rem 0 0.4rem;
  font-size: 1.7rem;
}

.sub {
  margin: 0;
  opacity: 0.95;
}

.form-grid {
  padding: 1.2rem 1.5rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 0.38rem;
}

.field-full {
  grid-column: 1 / -1;
}

label {
  font-weight: 700;
  color: #4f473f;
}

input,
select,
button {
  font: inherit;
}

input[type="text"],
select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.62rem 0.72rem;
  background: #fff;
}

input[type="text"]:focus,
select:focus {
  outline: 2px solid #e3a06e;
  border-color: #d17d52;
}

.toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.52rem 0.72rem;
  background: #fff;
}

.toggle-state {
  font-weight: 700;
  color: #5a5046;
}

.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 30px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  inset: 0;
  cursor: pointer;
  background: #c8beb1;
  transition: 0.2s ease;
  border-radius: 999px;
}

.switch-slider::before {
  content: "";
  position: absolute;
  height: 22px;
  width: 22px;
  left: 4px;
  top: 4px;
  background: #fff;
  transition: 0.2s ease;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.switch input:checked + .switch-slider {
  background: linear-gradient(125deg, #b5442c 0%, #dc8a4d 100%);
}

.switch input:checked + .switch-slider::before {
  transform: translateX(22px);
}

.slider-field input[type="range"] {
  width: 100%;
  margin: 0.2rem 0 0;
  accent-color: #bf5531;
}

.slider-ticks {
  margin-top: 0.1rem;
  position: relative;
  height: 1.1rem;
  color: #776d62;
  font-size: 0.78rem;
  line-height: 1.25;
}

.slider-ticks span {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  text-align: center;
  white-space: nowrap;
}

.slider-ticks span:first-child {
  left: 0;
  transform: none;
  text-align: left;
}

.slider-ticks span:last-child {
  left: 100%;
  transform: translateX(-100%);
  text-align: right;
}

.slider-ticks-4 span:nth-child(2) { left: 33.3333%; }
.slider-ticks-4 span:nth-child(3) { left: 66.6667%; }

.slider-ticks-6 span:nth-child(2) { left: 20%; }
.slider-ticks-6 span:nth-child(3) { left: 40%; }
.slider-ticks-6 span:nth-child(4) { left: 60%; }
.slider-ticks-6 span:nth-child(5) { left: 80%; }

.slider-value {
  margin: 0;
  font-weight: 700;
  color: #5a5046;
}

.slider-field .slider-value {
  margin-top: 0.2rem;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.2rem;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.66rem 1.14rem;
  background: #1d1a17;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.status {
  margin: 0;
  color: var(--muted);
}

.result-box {
  margin: 0 1.5rem 1.3rem;
  border-radius: 14px;
  border: 1px solid #d8b89c;
  background: linear-gradient(160deg, #fff6e9, #fffdf9);
  padding: 1rem 1.2rem;
}

.result-label {
  margin: 0;
  color: #6e3d2d;
  font-weight: 700;
}

.result-value {
  margin: 0.3rem 0 0;
  font-size: 2rem;
  font-weight: 900;
  color: #8a2f1b;
}

.footnote {
  padding: 0 1.5rem 1.3rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footnote-actions {
  margin-top: 0.55rem;
}

.github-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.48rem 0.85rem;
  border-radius: 999px;
  border: 1px solid #d8b89c;
  background: #1d1a17;
  color: #fff;
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
}

.github-btn:hover {
  background: #000;
}

.byline {
  margin: 0.65rem 0 0;
  color: #7d2f19;
  font-weight: 700;
}

@media (max-width: 760px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

  .slider-ticks {
    font-size: 0.72rem;
    height: 1rem;
  }

  h1 {
    font-size: 1.32rem;
  }

  .result-value {
    font-size: 1.75rem;
  }
}