:root {
  --ink: #0b1a1d;
  --teal: #128b8e;
  --teal-dark: #087477;
  --sand: #f3f0e9;
  --paper: #fbfaf7;
  --blue: #667f8f;
  --line: rgba(11, 26, 29, 0.15);
  --muted: rgba(11, 26, 29, 0.62);
  --radius: 18px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--sand);
  color: var(--ink);
  font:
    400 1rem/1.6 "DM Sans",
    sans-serif;
}
button,
input {
  font: inherit;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  color: inherit;
}
a {
  color: inherit;
}
.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: white;
}
.skip-link:focus {
  top: 1rem;
}
.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
  background: rgba(243, 240, 233, 0.92);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--teal-dark);
  font:
    800 0.72rem/1 "Manrope",
    sans-serif;
}
.brand strong,
.brand small {
  display: block;
}
.brand strong {
  font:
    700 0.88rem/1.2 "Manrope",
    sans-serif;
}
.brand small {
  margin-top: 0.18rem;
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.header-link {
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3rem;
}
main {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 0 clamp(0.85rem, 4vw, 3.5rem) 4rem;
}
.hero {
  min-height: 430px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  align-items: end;
  gap: 3rem;
  padding: clamp(4rem, 9vw, 7rem) 0 3rem;
}
.eyebrow {
  margin: 0 0 1.4rem;
  color: var(--teal-dark);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.15em;
}
.eyebrow span {
  display: inline-block;
  width: 30px;
  margin-right: 0.65rem;
  border-top: 1px solid var(--teal);
  vertical-align: middle;
}
.hero h1 {
  margin: 0;
  max-width: 850px;
  font:
    700 clamp(3.5rem, 8.5vw, 7.7rem)/0.9 "Manrope",
    sans-serif;
  letter-spacing: -0.075em;
}
.hero h1 em {
  color: var(--teal);
  font-family: Georgia, serif;
  font-weight: 400;
}
.hero > p {
  max-width: 430px;
  margin: 0 0 0.8rem;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.55;
}
.compare-tool,
.comparison-result,
.pair-library {
  border: 1px solid var(--line);
  background: rgba(251, 250, 247, 0.8);
}
.compare-tool {
  padding: clamp(1.15rem, 3vw, 2rem);
  border-radius: var(--radius);
}
.tool-heading,
.library-heading,
.result-top {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}
.tool-heading small,
.library-heading small,
.result-top small {
  color: var(--teal-dark);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.13em;
}
.tool-heading h2,
.library-heading h2 {
  margin: 0.35rem 0 0;
  font:
    700 clamp(1.55rem, 3vw, 2.35rem)/1.15 "Manrope",
    sans-serif;
  letter-spacing: -0.035em;
}
.text-button {
  min-height: 44px;
  padding: 0.55rem 0.85rem;
  border: 0;
  background: transparent;
  font-weight: 700;
  cursor: pointer;
}
.text-button:hover span {
  transform: translate(2px, -2px);
}
.text-button span {
  display: inline-block;
  transition: transform 0.2s;
}
.picker-grid {
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: 1fr 46px 1fr;
  align-items: center;
  gap: 1rem;
}
.picker {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
}
.picker > span {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.65rem;
  font-weight: 700;
}
.picker > span b {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--teal);
  color: white;
  font-size: 0.74rem;
}
.picker-b > span b {
  background: var(--blue);
}
.picker input,
.pair-search input {
  width: 100%;
  min-height: 48px;
  padding: 0.72rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: white;
  color: var(--ink);
  font-size: 1rem;
}
.picker input:focus,
.pair-search input:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(18, 139, 142, 0.24);
  outline-offset: 2px;
}
.picker small {
  display: block;
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.76rem;
}
.exchange {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--sand);
  font-size: 1.2rem;
}
.suggestions {
  grid-column: 1 / -1;
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--teal);
  background: rgba(18, 139, 142, 0.045);
}
.suggestions > span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.suggestions > div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.suggestions button,
.filters button {
  min-height: 40px;
  padding: 0.48rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: white;
  cursor: pointer;
}
.suggestions button:hover,
.filters button:hover,
.filters button.active {
  border-color: var(--teal);
  color: var(--teal-dark);
}
.form-message {
  grid-column: 1 / -1;
  min-height: 1.5rem;
  margin: 0;
  color: #8a4f3f;
  font-weight: 600;
}
.compare-button {
  grid-column: 1 / -1;
  justify-self: center;
  min-width: 220px;
  min-height: 52px;
  padding: 0.8rem 1.15rem;
  border: 0;
  border-radius: 99px;
  background: var(--ink);
  color: white;
  font-weight: 700;
  cursor: pointer;
}
.compare-button:hover span {
  display: inline-block;
  transform: translateX(4px);
}
.comparison-result {
  margin-top: 1.5rem;
  padding: clamp(1.1rem, 3vw, 2.2rem);
  border-radius: var(--radius);
  scroll-margin-top: 1rem;
}
.result-top {
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--line);
}
.result-top h2 {
  margin: 0.3rem 0 0;
  font:
    700 clamp(1.6rem, 4vw, 3.2rem)/1.08 "Manrope",
    sans-serif;
  letter-spacing: -0.05em;
}
.result-top h2 span {
  color: var(--teal);
}
.result-top button {
  min-height: 42px;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: transparent;
  cursor: pointer;
}
.sentence-difference {
  margin: 1.3rem 0;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border-radius: 14px;
  background: var(--ink);
  color: white;
}
.sentence-difference span {
  color: #8ad0d1;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.sentence-difference p {
  max-width: 900px;
  margin: 0.55rem 0 0;
  font:
    600 clamp(1.08rem, 2vw, 1.4rem)/1.55 "Manrope",
    sans-serif;
}
.item-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.item-card {
  min-width: 0;
  padding: clamp(1rem, 2.5vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
}
.item-card.side-b {
  box-shadow: inset 3px 0 var(--blue);
}
.item-card.side-a {
  box-shadow: inset 3px 0 var(--teal);
}
.item-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.item-label b {
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--teal);
  color: white;
}
.side-b .item-label b {
  background: var(--blue);
}
.item-card h3 {
  margin: 0.8rem 0;
  font:
    700 clamp(1.65rem, 3vw, 2.5rem)/1.08 "Manrope",
    sans-serif;
  letter-spacing: -0.045em;
}
.item-card > p {
  margin: 1rem 0 0;
  font-size: 1rem;
  line-height: 1.7;
}
.item-card dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
  margin: 0;
}
.item-card dl div {
  padding: 0.7rem;
  border-top: 1px solid var(--line);
}
.item-card dt {
  color: var(--muted);
  font-size: 0.72rem;
}
.item-card dd {
  margin: 0.15rem 0 0;
  font-weight: 700;
}
.item-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.1rem;
}
.item-links a {
  font-size: 0.8rem;
  font-weight: 700;
  text-underline-offset: 0.25rem;
}
.item-links a span {
  color: var(--teal);
}
.insight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}
.insight-grid > section,
.visual-comparison {
  padding: clamp(1rem, 2.5vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.35);
}
.section-title {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
.section-title small {
  color: var(--teal-dark);
  font-weight: 700;
}
.section-title h3 {
  margin: 0;
  font:
    700 1.2rem/1.25 "Manrope",
    sans-serif;
}
.insight-grid ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}
.insight-grid li + li {
  margin-top: 0.55rem;
}
.insight-grid p {
  margin: 1rem 0 0;
}
.visual-comparison {
  margin-top: 1rem;
}
.visual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}
.visual-grid figure {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
}
.visual-grid figure > span {
  position: absolute;
  z-index: 1;
  top: 0.7rem;
  left: 0.7rem;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--teal);
  color: white;
  font-weight: 700;
}
.visual-grid figure:nth-child(2) > span {
  background: var(--blue);
}
.visual-grid img {
  width: 100%;
  height: min(420px, 46vw);
  display: block;
  object-fit: contain;
}
.visual-grid figcaption {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--line);
  font-weight: 700;
}
.route-note {
  margin: 1rem 0 0;
  padding: 0.8rem;
  background: rgba(102, 127, 143, 0.08);
}
.route-note strong {
  display: block;
  color: var(--blue);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}
.result-actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
}
.result-actions button,
.result-actions a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: transparent;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.pair-library {
  margin-top: 1.5rem;
  padding: clamp(1.1rem, 3vw, 2rem);
  border-radius: var(--radius);
}
.pair-search {
  width: min(330px, 100%);
}
.pair-search span {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.2rem 0;
}
.filters button.active {
  background: var(--ink);
  border-color: var(--ink);
  color: white;
}
.pair-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}
.pair-grid > button {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.7rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  text-align: left;
  cursor: pointer;
  transition:
    transform 0.2s,
    border-color 0.2s;
}
.pair-grid > button:hover {
  transform: translateY(-2px);
  border-color: rgba(18, 139, 142, 0.45);
}
.pair-grid small {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.pair-grid strong {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  font:
    700 1rem/1.3 "Manrope",
    sans-serif;
}
.pair-grid strong span:last-child {
  text-align: right;
}
.pair-grid strong i {
  color: var(--teal);
  font-style: normal;
}
.pair-grid > button > b {
  margin-top: auto;
  color: var(--teal-dark);
  font-size: 0.76rem;
}
.empty-pairs {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}
.education-note {
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}
footer {
  display: grid;
  grid-template-columns: 1fr 2fr auto auto;
  align-items: start;
  gap: 1.5rem;
  padding: 2rem clamp(1rem, 6vw, 5rem);
  background: var(--ink);
  color: white;
  font-size: 0.78rem;
}
footer div strong,
footer div span {
  display: block;
}
footer div span,
footer p {
  color: rgba(255, 255, 255, 0.67);
}
footer p {
  max-width: 680px;
  margin: 0;
}
footer > span {
  white-space: nowrap;
}
.hm-privacy-link {
  white-space: nowrap;
}
@media (max-width: 900px) {
  .hero {
    min-height: 360px;
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .pair-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  footer {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 680px) {
  .site-header {
    min-height: 72px;
    padding: 0.8rem 1rem;
  }
  .brand-mark {
    display: none;
  }
  .brand strong {
    font-size: 0.8rem;
  }
  .header-link {
    font-size: 0.75rem;
  }
  main {
    padding-inline: 0.7rem;
  }
  .hero {
    min-height: 330px;
    padding: 3.5rem 0.3rem 2rem;
  }
  .hero h1 {
    font-size: clamp(2.8rem, 15vw, 4.4rem);
  }
  .tool-heading,
  .library-heading,
  .result-top {
    align-items: flex-start;
    flex-direction: column;
  }
  .picker-grid {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }
  .exchange {
    margin: -0.2rem auto;
    transform: rotate(90deg);
  }
  .suggestions,
  .form-message,
  .compare-button {
    grid-column: 1;
  }
  .compare-button {
    width: 100%;
  }
  .item-grid,
  .insight-grid,
  .visual-grid {
    grid-template-columns: 1fr;
  }
  .item-card dl {
    grid-template-columns: 1fr;
  }
  .visual-grid img {
    height: 320px;
  }
  .result-top button {
    align-self: stretch;
  }
  .result-actions {
    flex-direction: column;
  }
  .result-actions > * {
    justify-content: center;
  }
  .pair-search {
    width: 100%;
  }
  .filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.4rem;
  }
  .filters button {
    flex: 0 0 auto;
  }
  .pair-grid {
    grid-template-columns: 1fr;
  }
  .pair-grid > button {
    min-height: 126px;
  }
  footer {
    grid-template-columns: 1fr;
    padding: 1.5rem 1rem;
  }
}
@media (max-width: 350px) {
  .hero h1 {
    font-size: 2.7rem;
  }
  .picker,
  .compare-tool,
  .comparison-result,
  .pair-library {
    padding: 0.85rem;
  }
  .pair-grid strong {
    font-size: 0.9rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}