@charset "UTF-8";

/* ------------------------------------------------------------------
   unagi.lab
   地は白。彩度を持つのは章ごとのアクセントと一本の線だけに絞る。
   ------------------------------------------------------------------ */

:root {
  --paper:      #fbfdfe;
  --paper-lift: #ffffff;
  --tint:       #ecf3f8;
  --ink:        #0c1e28;
  --ink-mid:    #3f555f;
  --ink-soft:   #5d747e;
  --brand:      #10658f;
  --brand-deep: #0e3040;
  --rule:       #cfdde5;
  --rule-soft:  #e3ecf1;

  /* 生体情報モニターのチャンネル色。心電図=緑 / SpO2=青 / 血圧=赤 という
     世界共通の割り当てをそのまま拾い、章ごとの色分けにも使う。 */
  --ecg:        #157a5e;
  --spo2:       #10658f;
  --resp:       #8a6210;
  --signal:     #b32b1d;

  --accent:     var(--brand);

  --mincho: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --gothic: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", sans-serif;

  --gutter: clamp(1.25rem, 5vw, 4rem);
  --measure: 34rem;

  /* 見出しと波形の寸法。両者の基線を重ねる計算に使う。 */
  --h1:      clamp(2.5rem, 8vw, 6.25rem);
  /* 波形は画面端から端まで走るので、高さは画面幅に連動させる。
     viewBox の 1200:160 (7.5:1) に近い比率を保つと波形が縦に潰れない。 */
  --trace-h: clamp(6rem, 16vw, 18rem);
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--gothic);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: .04em;
  line-break: strict;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand-deep);
  color: var(--paper-lift);
  padding: .75rem 1.25rem;
  z-index: 20;
}
.skip:focus { left: 0; }

/* --- masthead ---------------------------------------------------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color .25s;
}
.masthead.is-stuck { border-bottom-color: var(--rule); }

.masthead__inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo {
  font-family: var(--gothic);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: .01em;
  text-decoration: none;
}
.logo__dot { color: var(--signal); }

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-size: .875rem;
  letter-spacing: .06em;
}
.nav a { text-decoration: none; color: var(--ink-mid); }
.nav a:hover { color: var(--brand); }

.nav__cta {
  color: var(--brand-deep);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: .4rem 1.1rem;
  line-height: 1.6;
}
.nav__cta:hover {
  background: var(--brand-deep);
  border-color: var(--brand-deep);
  color: var(--paper-lift);
}

@media (max-width: 46rem) {
  .nav a:not(.nav__cta) { display: none; }
}

/* --- hero -------------------------------------------------------- */

.hero {
  padding: clamp(4.5rem, 11vw, 9.5rem) 0 clamp(1.75rem, 3.5vw, 2.75rem);
}

.hero__inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
}

.hero__title {
  margin: 0;
  font-family: var(--mincho);
  font-weight: 600;
  font-size: var(--h1);
  line-height: 1.4;
  letter-spacing: .015em;
  text-indent: -.08em;
}

/* .hero__inner の外に置いてあるので、幅の指定なしで画面端から端まで届く。 */
.trace {
  display: block;
  width: 100%;
  height: var(--trace-h);
  /* 線の見える位置は SVG の箱の上端ではなく 62.5% の高さ（波形の基線）。
     箱の上部は空白なので、見出しに寄せるにはマイナスマージンで食い込ませる。 */
  margin: calc(-0.12 * var(--trace-h)) 0 0;
}
.trace path {
  fill: none;
  stroke: url(#trace-ink);
  stroke-width: 2.25;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

/* 左から右へ現れる。stroke-dasharray による描画は
   non-scaling-stroke と preserveAspectRatio="none" の組み合わせで
   破線長が画面座標で計算されるため、拡大率によっては線が途中で切れる。
   クリップなら拡大率に左右されない。 */
.trace {
  clip-path: inset(0 100% 0 0);
  animation: reveal 2.8s cubic-bezier(.62, .02, .3, 1) .4s forwards;
}
.trace__ecg    { stop-color: var(--ecg); }
.trace__spo2   { stop-color: var(--spo2); }
.trace__signal { stop-color: var(--signal); }

@keyframes reveal { to { clip-path: inset(0); } }

@media (prefers-reduced-motion: reduce) {
  .trace { animation: none; clip-path: none; }
}

.hero__lead {
  max-width: var(--measure);
  margin: clamp(1.75rem, 4vw, 3rem) 0 0;
  font-size: 1.0625rem;
  color: var(--ink-mid);
}

/* --- 帯（レール付きの本文セクション） ------------------------------ */

.band { padding: clamp(2.75rem, 5.5vw, 4.75rem) 0; }

.band--business { --accent: var(--ecg); }

.band--approach {
  --accent: var(--spo2);
  background: var(--tint);
}

.band--company { --accent: var(--resp); }

.band__inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0 clamp(1rem, 4vw, 3.5rem);
}

.rail {
  margin: 0;
  writing-mode: vertical-rl;
  font-size: .8125rem;
  letter-spacing: .32em;
  color: var(--accent);
  position: sticky;
  top: 7rem;
  align-self: start;
  width: max-content;
  white-space: nowrap;
  padding-left: .55rem;
  border-left: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}

.band__body { min-width: 0; }

.h2 {
  margin: 0 0 clamp(1rem, 2.2vw, 1.5rem);
  font-family: var(--mincho);
  font-weight: 600;
  font-size: clamp(1.625rem, 3.6vw, 2.5rem);
  line-height: 1.55;
  letter-spacing: .02em;
  text-indent: -.05em;
}
.h2--light { color: var(--paper-lift); }

.lede {
  max-width: var(--measure);
  margin: 0 0 clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--ink-mid);
}

/* 事業内容 */

.items { margin: 0; }

.item {
  display: grid;
  grid-template-columns: 14rem 1fr;
  gap: 0 2rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--rule-soft);
}
.item:last-child { border-bottom: 1px solid var(--rule-soft); }

.item dt {
  font-family: var(--mincho);
  text-indent: -1rem;
  padding-left: 1rem;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.7;
}
.item dt::before {
  content: "";
  display: inline-block;
  width: .4rem;
  height: .4rem;
  margin-right: .6rem;
  vertical-align: .2em;
  background: var(--accent);
}

.item dd {
  margin: 0;
  max-width: var(--measure);
  color: var(--ink-mid);
  font-size: .9375rem;
}

/* 進め方 */

.stances {
  display: grid;
  gap: clamp(1.75rem, 3vw, 2.5rem);
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.stance h3 {
  margin: 0 0 .6rem;
  font-family: var(--mincho);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.7;
  padding-top: 1rem;
  border-top: 2px solid var(--accent);
}
.stance p {
  margin: 0;
  color: var(--ink-mid);
  font-size: .9375rem;
}

/* 会社概要 */

.facts {
  width: 100%;
  max-width: 44rem;
  border-collapse: collapse;
  text-align: left;
}
.facts th,
.facts td {
  padding: .9rem 0;
  border-top: 1px solid var(--rule-soft);
  vertical-align: top;
  font-weight: 400;
}
.facts tr:last-child th,
.facts tr:last-child td { border-bottom: 1px solid var(--rule-soft); }
.facts th {
  width: 9rem;
  color: var(--accent);
  font-size: .875rem;
  letter-spacing: .1em;
  padding-right: 1.5rem;
}
.facts td { font-size: .9375rem; }
.facts__sub {
  display: block;
  color: var(--ink-soft);
  font-size: .8125rem;
  letter-spacing: .05em;
}

/* --- お問い合わせ -------------------------------------------------- */

.contact {
  background: var(--brand-deep);
  color: #dae8f0;
  padding: clamp(2.75rem, 5.5vw, 4.75rem) 0;
}

.contact__inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: clamp(2rem, 4vw, 4rem);
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  align-items: start;
}

.contact__intro p {
  margin: 0;
  font-size: .9375rem;
  max-width: 26rem;
}

.topics {
  margin: 2.25rem 0 0;
  padding: 0;
  list-style: none;
  font-size: .875rem;
}
.topics li {
  padding: .95rem 0;
  border-top: 1px solid rgba(214, 232, 242, .18);
  color: #9fb9c7;
}
.topics li:last-child { border-bottom: 1px solid rgba(214, 232, 242, .18); }
.topics b {
  display: block;
  font-weight: 500;
  color: #dae8f0;
}

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

.form__row { margin: 0; display: flex; flex-direction: column; gap: .5rem; }
.form__row--wide,
.form__note,
.form__submit { grid-column: 1 / -1; }

.form label {
  font-size: .8125rem;
  letter-spacing: .1em;
  color: #9fb9c7;
}
.form label em {
  font-style: normal;
  margin-left: .6em;
  color: #f0a496;
  font-size: .75rem;
}

.form input,
.form textarea {
  width: 100%;
  font: inherit;
  font-size: .9375rem;
  color: var(--paper-lift);
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(214, 232, 242, .42);
  border-radius: 2px;
  padding: .7rem .85rem;
  transition: border-color .2s, background .2s;
}
.form input:hover,
.form textarea:hover { border-color: rgba(214, 232, 242, .72); }
.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: #6fb2d8;
  background: rgba(255, 255, 255, .14);
}
.form input:focus-visible,
.form textarea:focus-visible { outline: 2px solid #6fb2d8; outline-offset: 1px; }
.form textarea { resize: vertical; line-height: 1.85; }

.form input[aria-invalid="true"],
.form textarea[aria-invalid="true"] { border-color: #e8968a; }

.form__error {
  margin: 0;
  font-size: .8125rem;
  color: #f2b0a3;
  letter-spacing: .04em;
}

.form__note {
  margin: 0;
  font-size: .8125rem;
  color: #8aa4b2;
}

.form__submit { margin: .25rem 0 0; }
.form button {
  font: inherit;
  font-size: .9375rem;
  letter-spacing: .12em;
  color: var(--brand-deep);
  background: var(--paper-lift);
  border: 1px solid var(--paper-lift);
  border-radius: 999px;
  padding: .8rem 2.75rem;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.form button:hover { background: transparent; color: var(--paper-lift); }

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* --- footer ------------------------------------------------------- */

.foot {
  background: var(--brand-deep);
  color: #87a1b0;
  padding: 0 0 clamp(2rem, 4vw, 3rem);
}
.foot__inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: clamp(1.75rem, 3vw, 2.5rem) var(--gutter) 0;
  border-top: 1px solid rgba(214, 232, 242, .18);
}
.foot p { margin: 0; font-size: .8125rem; }
.foot__name { color: var(--paper-lift); font-size: .9375rem; letter-spacing: .06em; }
.foot__addr { margin-top: .35rem; }
.foot__copy { margin-top: 1.25rem; letter-spacing: .08em; }

/* --- 送信結果ページ ------------------------------------------------ */

.result {
  max-width: 40rem;
  margin: 0 auto;
  padding: clamp(4rem, 12vw, 9rem) var(--gutter);
}
.result .h2 { margin-bottom: 1.25rem; }
.result p { color: var(--ink-mid); }
.result ul { color: var(--signal); padding-left: 1.2em; }
.result a { color: var(--brand); }

/* --- 狭い画面 ----------------------------------------------------- */

@media (max-width: 54rem) {
  .contact__inner { grid-template-columns: minmax(0, 1fr); }
  .form { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 46rem) {
  body { line-height: 1.8; }

  .band__inner { grid-template-columns: minmax(0, 1fr); }

  .rail {
    writing-mode: horizontal-tb;
    position: static;
    width: auto;
    border-left: 0;
    border-top: 1px solid var(--rule);
    padding: .65rem 0 0;
    margin-bottom: 1.75rem;
  }

  .item { grid-template-columns: minmax(0, 1fr); gap: .5rem; }
}

@media (max-width: 30rem) {
  .facts th { width: 5.5rem; padding-right: 1rem; font-size: .8125rem; }
}