/* ============================================
   visum corporate site — style.css
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  --color-text: #1a1a1a;
  --color-text-soft: #555;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f8;
  --color-line: #e4e4e7;
  --color-accent: #1a1a1a;
  --color-hero-bg: #111114;

  --font-en: 'Montserrat', sans-serif;
  /* 本来は筑紫ゴシック。Adobe Fonts未契約のため、近い無料フォント(Zen Kaku Gothic New)を使用。
     利用者のPCに筑紫ゴシックがある場合はそちらを優先表示 */
  --font-jp: 'TsukuBRGothic', 'FOT-筑紫ゴシック Pr5', '筑紫ゴシック', 'Zen Kaku Gothic New', 'Noto Sans JP', sans-serif;

  --container: 1080px;
  --container-narrow: 720px;
  --header-h: 76px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.9;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p, dl, dd { margin: 0; }

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: 100px; }
.section:nth-of-type(even) { background: var(--color-bg-alt); }

.section__eyebrow {
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: var(--color-text-soft);
  text-align: center;
  margin-bottom: 28px;
  position: relative;
  padding-bottom: 20px;
}
.section__eyebrow::after {
  content: "";
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 40px; height: 2px;
  background: var(--color-accent);
}
.section__heading {
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: clamp(1.25rem, 3.5vw, 1.75rem);
  line-height: 1.7;
  text-align: center;
  letter-spacing: 0.04em;
  margin-bottom: 40px;
}
.section__heading--left { text-align: center; }

/* ---------- Header ---------- */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.header.is-scrolled {
  border-bottom-color: var(--color-line);
  box-shadow: 0 2px 20px rgba(0,0,0,0.04);
}
.header__inner {
  height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header__logo img { width: auto; height: 40px; }

.nav__list { display: flex; gap: 36px; }
.nav__link {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-text);
  position: relative;
  padding-block: 6px;
  transition: color 0.25s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--color-accent);
  transition: width 0.3s var(--ease);
}
.nav__link:hover { color: var(--color-text); }
.nav__link:hover::after { width: 100%; }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: none; border: none;
  cursor: pointer;
  padding: 0;
}
.nav__toggle span {
  display: block;
  width: 26px; height: 2px;
  background: var(--color-text);
  margin-inline: auto;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-hero-bg);
  background-image:
    radial-gradient(circle at 25% 30%, rgba(255,255,255,0.06), transparent 45%),
    radial-gradient(circle at 78% 70%, rgba(255,255,255,0.05), transparent 42%);
  color: #fff;
  text-align: center;
  padding: var(--header-h) 2vw 0;
}
.hero__title {
  font-family: var(--font-en);
  font-weight: 300;
  /* 横幅(vw)と画面高さ(vh)の両方を考慮し、小さいほうを採用。
     これで縦3行が常に画面内に収まりつつ、画面幅ぎりぎりまで大きく表示される */
  font-size: min(21.5vw, 24.5vh);
  letter-spacing: 0.02em;
  line-height: 1.12;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(24px);
  animation: heroIn 1.1s var(--ease) 0.15s forwards;
}
@keyframes heroIn {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Concept ---------- */
.concept__body {
  max-width: 640px;
  margin-inline: auto;
  text-align: center;
  color: var(--color-text-soft);
}
.concept__body p + p { margin-top: 1.4em; }

/* ---------- Service ---------- */
.service__feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 72px;
}
.service__feature-visual {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.10);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.service__feature-visual:hover {
  transform: translateY(-4px);
  box-shadow: 0 28px 60px rgba(0,0,0,0.14);
}
.service__feature-logo {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
}
.service__freest-name {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: 0.01em;
  color: #1b4b8f;
  font-style: italic;
}
.service__freest-read {
  font-size: 0.9rem;
  color: var(--color-text-soft);
}
.service__feature-body p {
  color: var(--color-text-soft);
  margin-bottom: 28px;
}

.service__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.service__card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 40px 36px;
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.section:nth-of-type(even) .service__card { background: #fff; }
.service__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.07);
}
.service__card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--color-accent);
}
.service__card-icon svg {
  width: 46px;
  height: 46px;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  transition: transform 0.4s var(--ease);
}
.service__card:hover .service__card-icon svg {
  transform: translateY(-2px) rotate(-2deg);
}
.service__card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.service__card p { color: var(--color-text-soft); }
.service__card-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}
.service__card-links .btn--sm {
  padding: 9px 18px;
  font-size: 0.88rem;
  flex: 0 0 auto;
}

/* ---------- Company ---------- */
.company__table {
  max-width: 760px;
  margin-inline: auto;
  border-top: 1px solid var(--color-line);
}
.company__row {
  display: grid;
  grid-template-columns: 200px 1fr;
  border-bottom: 1px solid var(--color-line);
}
.company__row dt {
  font-weight: 700;
  padding: 24px 20px;
  background: rgba(0,0,0,0.015);
}
.company__row dd {
  padding: 24px 20px;
  color: var(--color-text-soft);
}

/* ---------- Contact / Form ---------- */
.form { margin-top: 8px; }
.form__group { margin-bottom: 24px; }
.form__label {
  display: block;
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.form__required {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  color: #fff;
  background: #d64545;
  border-radius: 3px;
  padding: 2px 7px;
  margin-left: 10px;
  vertical-align: middle;
  letter-spacing: 0.05em;
}
.form__input,
.form__textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  padding: 14px 16px;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.06);
}
.form__textarea { resize: vertical; min-height: 140px; }

/* honeypot */
.form__hp {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  overflow: hidden;
}

.form__submit { text-align: center; margin-top: 36px; }
.form__status {
  text-align: center;
  margin-top: 20px;
  font-size: 0.95rem;
  min-height: 1.5em;
}
.form__status.is-success { color: #1a7d4b; }
.form__status.is-error { color: #d64545; }

.contact__links {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}
.contact__links a {
  font-family: var(--font-en);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  font-weight: 500;
  position: relative;
  padding-bottom: 3px;
}
.contact__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.contact__links a:hover::after { transform: scaleX(1); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-jp);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 6px;
  padding: 15px 40px;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  border: 1.5px solid var(--color-accent);
}
.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.18);
}
.btn--primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.btn--outline {
  background: transparent;
  color: var(--color-accent);
}
.btn--outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-hero-bg);
  color: rgba(255,255,255,0.75);
  padding-block: 56px;
  text-align: center;
}
.footer__logo {
  display: inline-block;
  margin-bottom: 20px;
  background: #fff;
  padding: 12px 20px;
  border-radius: 6px;
}
.footer__logo img { height: 34px; width: auto; }
.footer__copy {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

/* ---------- Responsive line-break control ---------- */
/* PCでは手動の改行（<br>）を活かし、スマホでは幅に合わせて自然に折り返す */
@media (max-width: 640px) {
  .concept__body br,
  .service__feature-body br,
  .service__card br {
    display: none;
  }
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .service__feature { grid-template-columns: 1fr; gap: 36px; }
  .service__feature-visual { max-width: 460px; margin-inline: auto; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .section { padding-block: 72px; }

  .header__logo img { height: 34px; }

  /* mobile nav */
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-line);
    transform: translateY(-120%);
    transition: transform 0.4s var(--ease);
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
  }
  .nav.is-open { transform: translateY(0); }
  .nav__list {
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
  }
  .nav__list li { width: 100%; }
  .nav__link {
    display: block;
    padding: 18px 28px;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--color-line);
  }
  .nav__list li:last-child .nav__link { border-bottom: none; }
  .nav__link::after { display: none; }
  .nav__toggle { display: flex; }

  .service__grid { grid-template-columns: 1fr; gap: 20px; }
  .service__card { padding: 32px 28px; }

  .company__row { grid-template-columns: 1fr; }
  .company__row dt {
    padding: 18px 20px 8px;
    background: transparent;
  }
  .company__row dd { padding: 0 20px 20px; }

  .contact__links { gap: 28px; }
}

@media (max-width: 420px) {
  .container { padding-inline: 18px; }
  .btn { width: 100%; }
  /* カード内の小ボタンは全幅にせず横並びを維持 */
  .service__card-links .btn--sm { width: auto; }
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .hero__title, .reveal { opacity: 1; transform: none; }
}