:root {
  --paper: #f6eddc;
  --paper-deep: #eadbbd;
  --panel: #fffdf8;
  --ink: #2f2a21;
  --muted: #776b59;
  --line: rgba(94, 78, 55, 0.22);
  --green: #4f8f63;
  --green-deep: #2f6c49;
  --amber: #d99b46;
  --melt: #5a3f2a;
  --melt-soft: rgba(118, 82, 48, 0.24);
  --shadow: 0 18px 40px rgba(62, 45, 23, 0.12);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 0;
}

body {
  background:
    linear-gradient(180deg, rgba(217, 155, 70, 0.16), transparent 360px),
    repeating-linear-gradient(90deg, rgba(212, 181, 125, 0.18) 0 1px, transparent 1px 74px),
    var(--paper);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, system-ui, sans-serif;
  line-height: 1.7;
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-header {
  align-items: center;
  background: rgba(255, 250, 240, 0.94);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 18px;
  justify-content: space-between;
  padding: 14px clamp(14px, 3vw, 30px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: inline-flex;
  font-weight: 900;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.site-nav a,
.primary-button,
.ghost-button {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-weight: 900;
  justify-content: center;
  min-height: 40px;
  padding: 8px 12px;
  text-decoration: none;
}

.site-nav a,
.ghost-button {
  background: #fffdf8;
  color: var(--ink);
}

.primary-button {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.site-nav a:hover,
.ghost-button:hover {
  border-color: var(--green);
}

.page-shell {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(140px, 190px) minmax(0, 1fr) minmax(140px, 190px);
  margin: 0 auto;
  max-width: 1560px;
  padding: 18px 24px 44px;
}

.main-column {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.ad-rail {
  align-items: center;
  align-self: start;
  background: rgba(255, 253, 248, 0.7);
  border: 1px dashed rgba(94, 78, 55, 0.28);
  border-radius: var(--radius);
  color: var(--muted);
  display: flex;
  justify-content: center;
  min-height: 280px;
  padding: 16px;
  position: sticky;
  text-align: center;
  top: 84px;
}

.mode-title,
.control-bar,
.melt-panel,
.input-panel,
.metric-card,
.result-panel,
.related-panel,
.prompt-list {
  background: rgba(255, 253, 248, 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-width: 0;
  padding: clamp(18px, 3vw, 28px);
}

.mode-title {
  display: grid;
  gap: 6px;
}

.eyebrow {
  color: var(--green-deep);
  font-size: 13px;
  font-weight: 900;
  margin: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
  margin-bottom: 10px;
}

.mode-title p:last-child,
.input-heading p,
.metric-card small,
.related-panel a,
.prompt-list,
.result-panel p {
  color: var(--muted);
}

.control-bar {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.select-field,
.toggle-field {
  align-items: center;
  background: #fff8eb;
  border: 1px solid rgba(94, 78, 55, 0.18);
  border-radius: 12px;
  display: inline-flex;
  gap: 8px;
  min-height: 42px;
  padding: 8px 10px;
}

.select-field span,
.toggle-field span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

select,
textarea {
  color: var(--ink);
  font: inherit;
}

select {
  background: #fffdf8;
  border: 1px solid var(--line);
  border-radius: 10px;
  min-height: 34px;
  padding: 4px 8px;
}

.melt-panel {
  display: grid;
  gap: 12px;
}

.status-strip {
  align-items: center;
  background: #fff4df;
  border: 1px solid rgba(217, 155, 70, 0.28);
  border-radius: 14px;
  display: grid;
  gap: 3px;
  grid-template-columns: minmax(130px, auto) minmax(0, 1fr);
  padding: 12px 14px;
}

.status-strip strong {
  color: var(--green-deep);
  font-size: 16px;
  letter-spacing: 0.04em;
}

.status-strip span:last-child {
  color: var(--muted);
  grid-column: 2;
}

.melt-stage {
  background:
    radial-gradient(circle at 18% 18%, rgba(255, 255, 255, 0.76), transparent 130px),
    linear-gradient(155deg, #fff9e8, #ead8b7);
  border: 1px solid rgba(94, 78, 55, 0.2);
  border-radius: var(--radius);
  min-height: clamp(320px, 43vw, 470px);
  overflow: hidden;
  padding: clamp(16px, 3vw, 26px);
  position: relative;
}

.heat-grid {
  background:
    repeating-linear-gradient(0deg, rgba(96, 73, 42, 0.07) 0 1px, transparent 1px 38px),
    repeating-linear-gradient(90deg, rgba(96, 73, 42, 0.07) 0 1px, transparent 1px 38px);
  inset: 0;
  mask-image: radial-gradient(circle at center, black, transparent 76%);
  opacity: 0.9;
  position: absolute;
}

.beaker-mark {
  border: 1px solid rgba(94, 78, 55, 0.2);
  border-radius: 999px;
  color: rgba(94, 78, 55, 0.45);
  font-size: 12px;
  font-weight: 900;
  padding: 4px 10px;
  position: absolute;
  z-index: 1;
}

.mark-left {
  left: 20px;
  top: 20px;
}

.mark-right {
  bottom: 20px;
  right: 20px;
}

.melt-card {
  background: linear-gradient(180deg, rgba(255, 253, 246, 0.96), rgba(255, 244, 219, 0.96));
  border: 1px solid rgba(94, 78, 55, 0.22);
  border-radius: 16px;
  box-shadow: 0 20px 52px rgba(74, 50, 24, 0.16);
  display: grid;
  gap: 14px;
  left: 50%;
  max-width: min(780px, calc(100% - 24px));
  min-height: 210px;
  padding: clamp(18px, 3vw, 30px);
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 88%;
  z-index: 2;
}

.card-header {
  color: var(--muted);
  display: flex;
  font-size: 12px;
  font-weight: 900;
  justify-content: space-between;
}

.document-label {
  color: var(--green-deep);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.05em;
  margin-bottom: 0;
}

.document-text {
  color: var(--melt);
  font-size: clamp(24px, 3.4vw, 42px);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.95;
  margin: 0;
  min-height: 110px;
  overflow: visible;
  position: relative;
  text-align: center;
  word-break: keep-all;
}

.melt-char {
  display: inline-block;
  filter: blur(var(--blur, 0px));
  min-width: 0.18em;
  position: relative;
  text-shadow:
    0 var(--smear, 0px) 0 rgba(90, 63, 42, 0.12),
    0 calc(var(--smear, 0px) * 1.8) 2px rgba(118, 82, 48, 0.14);
  transform:
    translateY(var(--my, 0px))
    skewY(var(--skew, 0deg))
    scaleY(var(--stretch, 1));
  transform-origin: 50% 20%;
  transition: filter 120ms linear;
}

.melt-char::after {
  background: linear-gradient(180deg, rgba(90, 63, 42, 0.58), rgba(90, 63, 42, 0));
  border-radius: 999px;
  content: "";
  height: var(--drip, 0px);
  left: 50%;
  max-height: 58px;
  opacity: var(--drip-alpha, 0);
  position: absolute;
  top: 0.92em;
  transform: translateX(-50%) translateX(var(--drip-x, 0px));
  width: var(--drip-width, 2px);
}

.melt-char.is-space {
  min-width: 0.55em;
}

.stamp {
  align-self: center;
  border: 3px solid var(--green);
  border-radius: 12px;
  color: var(--green-deep);
  font-size: clamp(24px, 4vw, 48px);
  font-weight: 900;
  justify-self: center;
  padding: 8px 18px;
  transform: rotate(-4deg);
}

.stamp.is-fail {
  border-color: #c47d3a;
  color: #8a5429;
}

.melt-meter {
  align-items: center;
  background: #fff8eb;
  border: 1px solid rgba(94, 78, 55, 0.16);
  border-radius: 14px;
  display: grid;
  gap: 10px;
  grid-template-columns: auto minmax(0, 1fr) auto;
  padding: 10px 12px;
}

.melt-meter span,
.melt-meter strong {
  font-size: 13px;
  font-weight: 900;
}

.melt-meter-track {
  background: rgba(94, 78, 55, 0.13);
  border-radius: 999px;
  height: 12px;
  overflow: hidden;
}

.melt-meter-track i {
  background: linear-gradient(90deg, var(--green), var(--amber));
  display: block;
  height: 100%;
  transform: scaleX(1);
  transform-origin: left center;
}

.input-panel {
  display: grid;
  gap: 12px;
}

.input-heading {
  align-items: baseline;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
}

.input-heading h2 {
  margin-bottom: 0;
}

.input-heading p {
  margin-bottom: 0;
}

textarea {
  background: #fffdf8;
  border: 2px solid rgba(79, 143, 99, 0.28);
  border-radius: 14px;
  min-height: 92px;
  padding: 12px 14px;
  resize: vertical;
  width: 100%;
}

textarea:disabled {
  background: #f0e6d2;
  color: var(--muted);
}

.next-row,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.metrics-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.metrics-grid.is-hidden {
  display: none;
}

.metric-card {
  display: grid;
  gap: 4px;
  padding: 14px;
}

.metric-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.metric-card strong {
  font-size: clamp(20px, 3vw, 30px);
}

.result-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 18px 0;
}

.result-grid div {
  background: #fff8eb;
  border: 1px dashed rgba(94, 78, 55, 0.2);
  border-radius: 14px;
  padding: 12px;
}

.result-grid span,
.share-box label {
  color: var(--muted);
  display: block;
  font-size: 12px;
  font-weight: 900;
}

.result-grid strong {
  display: block;
  font-size: clamp(18px, 2.4vw, 26px);
}

.result-grid small {
  color: var(--muted);
}

.share-box {
  display: grid;
  gap: 10px;
}

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

.related-grid a {
  background: #fff8eb;
  border: 1px solid rgba(94, 78, 55, 0.18);
  border-radius: 14px;
  font-weight: 900;
  padding: 12px;
  text-decoration: none;
}

.prompt-list summary {
  cursor: pointer;
  font-weight: 900;
}

.site-footer {
  color: var(--muted);
  display: grid;
  gap: 8px;
  padding: 26px 24px 40px;
  text-align: center;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 1340px) {
  .page-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .ad-rail {
    display: none;
  }
}

@media (max-width: 920px) {
  .metrics-grid,
  .result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header,
  .control-bar,
  .input-heading,
  .status-strip {
    align-items: start;
    display: grid;
    grid-template-columns: 1fr;
  }

  .page-shell {
    padding: 12px 10px 34px;
  }

  .site-nav {
    justify-content: start;
  }

  .site-nav a,
  .primary-button,
  .ghost-button,
  .select-field,
  .toggle-field {
    width: 100%;
  }

  .mode-title,
  .control-bar,
  .melt-panel,
  .input-panel,
  .result-panel,
  .related-panel,
  .prompt-list {
    padding: 16px 14px;
  }

  .melt-stage {
    min-height: 320px;
    padding: 12px;
  }

  .melt-card {
    max-width: calc(100% - 16px);
    padding: 16px 12px;
    width: 94%;
  }

  .document-text {
    font-size: clamp(21px, 7vw, 28px);
    line-height: 2.05;
    min-height: 136px;
    word-break: normal;
  }

  .metrics-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }
}