@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;500;700&display=swap');

/* =====================
   Reset & Variables
===================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary:    #0D1B3E;
  --color-accent:     #A8B0B9;
  --color-white:      #FFFFFF;
  --color-bg:         #F8F8F8;
  --color-border:     #E4E4E4;
  --color-text:       #1A1A1A;
  --color-text-mid:   #3A3A3A;
  --color-text-light: #888888;
  --font-sans:  'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --max-width:  1140px;
  --header-h:   72px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: var(--font-sans); cursor: pointer; }

/* =====================
   Layout
===================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
}

.main-content { margin-top: var(--header-h); }

/* =====================
   Header
===================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
}

.header__logo {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.header__logo-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  line-height: 1;
}

.header__logo-en {
  font-size: 9px;
  font-weight: 300;
  color: var(--color-accent);
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 44px;
}

.nav__link {
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-mid);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 4px;
  transition: color 0.25s;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.nav__link:hover,
.nav__link.active { color: var(--color-primary); }

.nav__link:hover::after,
.nav__link.active::after { width: 100%; }

.nav__cta {
  font-size: 10px;
  font-weight: 500;
  color: var(--color-white);
  background: var(--color-primary);
  padding: 11px 24px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid var(--color-primary);
  transition: background 0.25s, color 0.25s;
}

.nav__cta:hover {
  background: transparent;
  color: var(--color-primary);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
  width: 36px;
  height: 36px;
}

.hamburger__bar {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--color-primary);
  transition: all 0.3s;
}

.hamburger.is-open .hamburger__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.is-open .hamburger__bar:nth-child(2) { opacity: 0; }
.hamburger.is-open .hamburger__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  background: var(--color-white);
  padding: 32px 24px 40px;
  border-bottom: 1px solid var(--color-border);
  z-index: 999;
}

.mobile-nav.is-open { display: block; }

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
}

.mobile-nav__link {
  display: block;
  padding: 16px 0;
  font-size: 11px;
  color: var(--color-text-mid);
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.mobile-nav__cta {
  display: block;
  text-align: center;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 500;
  padding: 15px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* =====================
   Footer
===================== */
.footer {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 88px 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 64px;
  padding-bottom: 80px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.footer__brand-name {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.footer__brand-en {
  font-size: 9px;
  font-weight: 300;
  color: var(--color-accent);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.footer__mission {
  font-size: 13px;
  line-height: 2.1;
  color: rgba(255,255,255,0.42);
  font-weight: 300;
}

.footer__col-label {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 28px;
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer__nav-link {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  font-weight: 300;
  letter-spacing: 0.04em;
  transition: color 0.25s;
}

.footer__nav-link:hover { color: var(--color-white); }

.footer__address {
  font-size: 13px;
  line-height: 2.1;
  color: rgba(255,255,255,0.5);
  font-weight: 300;
}

.footer__bottom {
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copy {
  font-size: 11px;
  color: rgba(255,255,255,0.26);
  letter-spacing: 0.04em;
  font-weight: 300;
}

.footer__tagline {
  font-size: 11px;
  color: rgba(255,255,255,0.28);
  letter-spacing: 0.1em;
}

/* =====================
   Section
===================== */
.section { padding: 140px 0; }
.section--gray { background: var(--color-bg); }
.section--dark  { background: var(--color-primary); color: var(--color-white); }

/* Eyebrow */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.eyebrow__text {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: var(--color-accent);
  text-transform: uppercase;
  white-space: nowrap;
}

.eyebrow__line {
  width: 40px;
  height: 1px;
  background: var(--color-accent);
  flex-shrink: 0;
}

/* Headings */
.heading-serif {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1.55;
  letter-spacing: 0.01em;
}

.heading-serif--white { color: var(--color-white); }

/* Lead */
.lead {
  font-size: 15px;
  font-weight: 300;
  color: var(--color-text-mid);
  line-height: 2.2;
  max-width: 720px;
}

.lead--white { color: rgba(255,255,255,0.62); }

/* Decorative rule */
.deco-rule {
  width: 40px;
  height: 1px;
  background: var(--color-accent);
  margin: 28px 0;
}

/* =====================
   Page Hero (subpages)
===================== */
.page-hero {
  background: var(--color-primary);
  padding: 120px 0 80px;
}

.page-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.page-hero__label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.page-hero__line {
  width: 32px;
  height: 1px;
  background: var(--color-accent);
}

.page-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  color: var(--color-white);
  line-height: 1.45;
  margin-bottom: 20px;
}

.page-hero__lead {
  font-size: 14px;
  font-weight: 300;
  color: rgba(255,255,255,0.52);
  line-height: 2.0;
  max-width: 560px;
}

/* =====================
   Buttons
===================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  cursor: pointer;
  padding: 15px 36px;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background: transparent;
  color: var(--color-primary);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn--white {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}
.btn--white:hover {
  background: transparent;
  color: var(--color-white);
}

.btn__arrow {
  font-size: 14px;
  transition: transform 0.3s;
}
.btn:hover .btn__arrow { transform: translateX(5px); }

/* Text link */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  transition: border-color 0.3s, gap 0.3s;
}
.text-link:hover {
  border-color: var(--color-primary);
  gap: 16px;
}

/* =====================
   Forms
===================== */
.form-group { margin-bottom: 40px; }

.form-label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.26em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.form-label__ja {
  font-size: 12px;
  color: var(--color-text-mid);
  letter-spacing: 0.04em;
  text-transform: none;
  font-weight: 400;
}

.form-label .required {
  font-size: 9px;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  padding: 1px 5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 14px 0;
  font-size: 15px;
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  border-radius: 0;
  outline: none;
  transition: border-color 0.25s;
  appearance: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus { border-bottom-color: var(--color-primary); }

.form-input::placeholder,
.form-textarea::placeholder { color: #C4C9D1; }

.form-textarea {
  resize: none;
  min-height: 160px;
  line-height: 1.9;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23A8B0B9' stroke-width='1.2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px center;
  cursor: pointer;
}

/* =====================
   Info DL (About)
===================== */
.info-dl { border-top: 1px solid var(--color-border); }

.info-dl__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.info-dl__term {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  text-transform: uppercase;
  padding-top: 3px;
}

.info-dl__def {
  font-size: 15px;
  color: var(--color-text-mid);
  font-weight: 300;
  line-height: 2.0;
}

/* =====================
   Scroll Fade
===================== */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =====================
   Responsive
===================== */
@media (max-width: 960px) {
  :root { --header-h: 64px; }

  .container { padding: 0 24px; }
  .header__inner { padding: 0 24px; }
  .mobile-nav { padding: 32px 24px 40px; }

  .nav, .nav__cta { display: none; }
  .hamburger { display: flex; }

  .section { padding: 80px 0; }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-bottom: 48px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }

  .page-hero { padding: 100px 0 60px; }

  .info-dl__item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px 0;
  }
}

@media (max-width: 600px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
}