:root {
  --green: #61993B;
  --green-dark: #4a7a2a;
  --green-soft: #ecf5e3;
  --ink: #0f172a;
  --ink-soft: #475569;
  --bg: #f8fafc;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
main { max-width: 920px; margin: 0 auto; padding: 32px 20px 60px; }
header { text-align: center; margin-bottom: 24px; }
h1 {
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 800;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}
h1 .unit { color: var(--green); }
.dims {
  font-size: clamp(13px, 2.2vw, 16px);
  font-weight: 600;
  color: var(--ink-soft);
  margin: 0 0 4px;
  letter-spacing: 0.02em;
}
.analogy {
  font-size: clamp(12px, 2vw, 14px);
  color: var(--ink-soft);
  margin: 0;
  font-style: italic;
}
.badges {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.badge-cc {
  background: #e0f2fe;
  color: #075985;
  border: 1px solid #bae6fd;
}
.badge-dry {
  background: #ecfccb;
  color: #3f6212;
  border: 1px solid #d9f99d;
}
.stage-wrap {
  position: relative;
  background: #ffffff;
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 8px 28px rgba(15,23,42,0.08), inset 0 0 0 1px rgba(15,23,42,0.04);
  overflow: hidden;
}
.slider-stage {
  --reveal: 50%;
  position: relative;
  width: 100%;
  aspect-ratio: 1400 / 800;
  user-select: none;
  cursor: ew-resize;
  touch-action: none;
  overflow: hidden;
  border-radius: 10px;
}
.layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  pointer-events: none;
  -webkit-user-drag: none;
}
.layer.filled {
  clip-path: inset(0 calc(100% - var(--reveal)) 0 0);
}
.reveal-line {
  position: absolute;
  top: 0; bottom: 0;
  left: var(--reveal);
  width: 2px;
  background: rgba(255,255,255,0.95);
  box-shadow: 0 0 0 1px rgba(15,23,42,0.18), 0 0 12px rgba(0,0,0,0.18);
  transform: translateX(-1px);
  pointer-events: none;
}
.handle {
  position: absolute;
  top: 50%;
  left: var(--reveal);
  width: 48px;
  height: 48px;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25), 0 0 0 2px var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  color: var(--green);
}
.handle svg { width: 22px; height: 22px; }
.stage-label {
  position: absolute;
  top: 18px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.95);
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  color: var(--ink-soft);
  pointer-events: none;
  z-index: 2;
}
.stage-label.left { left: 18px; }
.stage-label.right {
  right: 18px;
  color: var(--green-dark);
  background: var(--green-soft);
}
.sqm-stamp {
  position: absolute;
  bottom: 20px;
  right: 22px;
  font-size: clamp(20px, 3.5vw, 30px);
  font-weight: 900;
  color: var(--ink);
  letter-spacing: -0.02em;
  pointer-events: none;
  z-index: 2;
  text-shadow: 0 1px 0 rgba(255,255,255,0.85);
}
.hint {
  text-align: center;
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 10px;
  font-weight: 500;
}
.contents {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.contents li {
  background: #fff;
  border: 1px solid #e7eaee;
  border-radius: 12px;
  padding: 14px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 14px;
  color: var(--ink);
}
.contents li .icon {
  font-size: 22px;
  width: 28px;
  text-align: center;
}
.size-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 24px 0 28px;
}
.size-nav-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}
.size-nav-row .label {
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-soft);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-right: 4px;
}
.size-nav a {
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid #e2e8f0;
  background: #fff;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 600;
}
.size-nav a.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.footer-note {
  text-align: center;
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 22px;
}
.footer-note a {
  color: var(--green-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--green);
  padding-bottom: 1px;
}
@media (max-width: 520px) {
  main { padding: 20px 12px 40px; }
  .handle { width: 38px; height: 38px; }
  .stage-label { font-size: 10px; padding: 4px 8px; }
}

/* Landing page */
body.landing { background: linear-gradient(180deg, #f5faf0 0%, #ffffff 240px); }
main.landing-main { max-width: 1180px; }
.brand-mark {
  text-align: center;
  margin: 0 0 4px;
  font-size: clamp(18px, 3vw, 22px);
  font-weight: 900;
  color: var(--green);
  letter-spacing: 0.04em;
}
.landing-h1 {
  font-size: clamp(26px, 5vw, 40px) !important;
  margin: 0 0 8px !important;
}
.section-title {
  font-size: 13px;
  font-weight: 800;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 38px 0 16px;
  text-align: center;
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: center;
}
.section-title::before, .section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, #d1d5db, transparent);
  max-width: 120px;
}
.size-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 8px;
}
.size-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 2.5px solid var(--green);
  border-radius: 18px;
  text-decoration: none;
  color: var(--ink);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  box-shadow: 0 2px 8px rgba(15,23,42,0.04);
  position: relative;
}
.size-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(97,153,59,0.22);
}
.size-card-thumb {
  background: linear-gradient(180deg, #fafdf6 0%, #ecf5e3 100%);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 2px solid var(--green-soft);
}
.size-card-thumb img {
  width: 92%;
  height: 92%;
  object-fit: contain;
  display: block;
}
.size-card-body {
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.size-card-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--green-dark);
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.size-card-dims {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 2px;
  font-variant-numeric: tabular-nums;
}
.size-card-floor {
  font-size: 11px;
  font-weight: 600;
  color: var(--green-dark);
  margin: 0 0 8px;
  font-variant-numeric: tabular-nums;
}
.size-card-analogy {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.4;
  flex: 1;
}
.size-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--green-dark);
}
.intro {
  text-align: center;
  font-size: clamp(13px, 2vw, 15px);
  color: var(--ink-soft);
  max-width: 580px;
  margin: 6px auto 4px;
  line-height: 1.5;
}
.card-dehumidifier-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 3;
  width: 44px;
  height: 56px;
  background: rgba(255,255,255,0.96);
  border: 1.5px solid var(--green);
  border-radius: 10px;
  padding: 5px 4px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--green-dark);
  box-shadow: 0 2px 8px rgba(15,23,42,0.10);
  box-sizing: border-box;
}
.card-dehumidifier-badge svg {
  width: 22px;
  height: 30px;
  flex-shrink: 0;
  display: block;
}
.card-dehumidifier-badge span {
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--green-dark);
  line-height: 1;
}
.card-tap-hint {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 3;
  width: 36px;
  height: 36px;
  background: var(--green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(97,153,59,0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card-tap-hint svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}
.size-card:hover .card-tap-hint {
  transform: scale(1.15);
  box-shadow: 0 6px 16px rgba(97,153,59,0.5);
}
@media (max-width: 980px) {
  .size-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .size-grid { grid-template-columns: 1fr; gap: 12px; }
  .size-card-thumb { aspect-ratio: 16/9; }
}