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

:root {
  --color-primary:    #1a2744;
  --color-primary-light: #243460;
  --color-accent:     #c9a84c;
  --color-accent-dark:#a8883a;
  --color-bg:         #f7f7f5;
  --color-bg-gray:    #f0f0ec;
  --color-text:       #2c2c2c;
  --color-text-light: #6b6b6b;
  --color-white:      #ffffff;
  --color-border:     #e0e0da;

  --font-sans:  'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;

  --radius: 4px;
  --shadow: 0 4px 24px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 48px rgba(0,0,0,.12);

  --section-py: 100px;
  --container-w: 1140px;
  --container-px: 24px;

  --transition: .3s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }

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

.section { padding: var(--section-py) 0; }
.section--gray { background: var(--color-bg-gray); }

.section__header {
  text-align: center;
  margin-bottom: 64px;
}

.section__eyebrow {
  display: inline-block;
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-primary);
}

.section__lead {
  margin-top: 20px;
  font-size: .95rem;
  color: var(--color-text-light);
  line-height: 2;
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .08em;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201,168,76,.35);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,.6);
}
.btn--outline:hover {
  background: rgba(255,255,255,.15);
  border-color: var(--color-white);
}

.btn--white {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
  font-weight: 700;
}
.btn--white:hover {
  background: transparent;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,255,255,.2);
}

/* Link arrow */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-top: 8px;
  transition: gap var(--transition);
}
.link-arrow::after {
  content: '→';
  transition: transform var(--transition);
}
.link-arrow:hover { gap: 14px; }

/* ===========================
   Header
   =========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: var(--color-white);
  padding: 12px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}

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

.header__logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-white);
  transition: color var(--transition);
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.header.scrolled .header__logo { color: var(--color-primary); }

.logo-office { font-weight: 400; font-size: .9em; }
.logo-d {
  font-size: 1.3em;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 1px;
}
.logo-first { font-weight: 400; font-size: .75em; letter-spacing: .05em; }

.nav__list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav__list a {
  font-size: .85rem;
  font-weight: 500;
  letter-spacing: .08em;
  color: rgba(255,255,255,.9);
  transition: color var(--transition);
}
.header.scrolled .nav__list a { color: var(--color-text); }
.nav__list a:hover { color: var(--color-accent); }

.nav__cta {
  padding: 10px 24px;
  border: 1.5px solid rgba(255,255,255,.7);
  border-radius: var(--radius);
  color: var(--color-white) !important;
  transition: background var(--transition), border-color var(--transition), color var(--transition) !important;
}
.nav__cta:hover {
  background: var(--color-accent) !important;
  border-color: var(--color-accent) !important;
  color: var(--color-white) !important;
}
.header.scrolled .nav__cta {
  border-color: var(--color-accent);
  color: var(--color-accent) !important;
}
.header.scrolled .nav__cta:hover {
  background: var(--color-accent) !important;
  color: var(--color-white) !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition);
  border-radius: 2px;
}
.header.scrolled .hamburger span { background: var(--color-primary); }

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, #0e1b35 0%, #1a2744 50%, #243460 100%);
}

/* 幾何学的な装飾 */
.hero__bg::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  border-radius: 50%;
  border: 1px solid rgba(201,168,76,.15);
}
.hero__bg::after {
  content: '';
  position: absolute;
  top: 10%;
  right: 5%;
  width: 40vw;
  height: 40vw;
  border-radius: 50%;
  border: 1px solid rgba(201,168,76,.1);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(14,27,53,.9) 40%, rgba(14,27,53,.3) 100%);
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--container-w);
  width: 100%;
  margin: 0 auto;
  padding: 120px var(--container-px) 100px;
}

.hero__eyebrow {
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp .8s .2s forwards;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.45;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp .8s .4s forwards;
}
.hero__title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero__lead {
  font-size: clamp(.875rem, 1.5vw, 1.05rem);
  color: rgba(255,255,255,.8);
  line-height: 2;
  margin-bottom: 48px;
  max-width: 500px;
  opacity: 0;
  animation: fadeUp .8s .6s forwards;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp .8s .8s forwards;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  opacity: 0;
  animation: fadeIn 1s 1.2s forwards;
}
.scroll__label {
  font-size: .65rem;
  letter-spacing: .2em;
  color: rgba(255,255,255,.5);
}
.scroll__line {
  display: block;
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,.3);
  position: relative;
  overflow: hidden;
}
.scroll__line::after {
  content: '';
  position: absolute;
  top: -40px;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  animation: scrollLine 1.8s 1.5s infinite;
}

/* ===========================
   Stats
   =========================== */
.stats {
  background: var(--color-primary);
  padding: 56px 0;
}

.stats__list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.stats__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  border-right: 1px solid rgba(255,255,255,.1);
}
.stats__item:last-child { border-right: none; }

.stats__num {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}
.stats__num small {
  font-size: .55em;
  font-weight: 400;
}

.stats__label {
  font-size: .8rem;
  color: rgba(255,255,255,.6);
  letter-spacing: .05em;
}

/* ===========================
   About
   =========================== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about__visual {
  position: relative;
}

.about__image-frame {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: 8px;
  overflow: hidden;
}
.about__image-frame::before {
  content: '';
  position: absolute;
  inset: -16px -16px 16px 16px;
  border: 2px solid var(--color-accent);
  border-radius: 8px;
  z-index: -1;
  opacity: .4;
}

.about__image-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.about__body .section__eyebrow { display: block; text-align: left; }
.about__body .section__title { font-size: clamp(1.4rem, 2.5vw, 2rem); }

.about__text {
  margin-top: 20px;
  font-size: .95rem;
  color: var(--color-text-light);
  line-height: 2;
}
.about__text + .about__text { margin-top: 12px; }

/* ===========================
   Services
   =========================== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-white);
  border-radius: 8px;
  padding: 40px 36px;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}
.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.service-card__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.service-card__text {
  font-size: .875rem;
  color: var(--color-text-light);
  line-height: 1.9;
}

/* ===========================
   Process
   =========================== */
.process__steps {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.process__step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}
.process__step:last-child { border-bottom: none; }

.process__num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-bg-gray);
  line-height: 1;
  padding-top: 4px;
  transition: color var(--transition);
  user-select: none;
}
.process__step:hover .process__num { color: var(--color-accent); }

.process__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.process__text {
  font-size: .875rem;
  color: var(--color-text-light);
  line-height: 1.9;
}

/* ===========================
   CTA Section
   =========================== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -5%;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  border: 1px solid rgba(201,168,76,.12);
}

.cta-section__inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-section .section__eyebrow { color: var(--color-accent); }

.cta-section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-white);
  margin: 16px 0 24px;
  line-height: 1.4;
}

.cta-section__lead {
  font-size: .95rem;
  color: rgba(255,255,255,.75);
  line-height: 2;
  margin-bottom: 48px;
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: #0e1b35;
  padding: 64px 0 0;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.footer__logo {
  display: flex;
  align-items: baseline;
  gap: 2px;
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.footer__tagline {
  font-size: .8rem;
  color: rgba(255,255,255,.4);
  line-height: 1.8;
  white-space: nowrap;
}

.footer__nav {
  display: flex;
  gap: 60px;
}
.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.footer__nav a {
  font-size: .8rem;
  color: rgba(255,255,255,.5);
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--color-accent); }

.footer__bottom {
  padding: 24px 0;
  text-align: center;
}
.footer__bottom p {
  font-size: .75rem;
  color: rgba(255,255,255,.25);
  letter-spacing: .05em;
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scrollLine {
  0%   { top: -100%; }
  100% { top: 100%; }
}

/* Scroll-triggered fade-up */
.js-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s ease, transform .7s ease;
}
.js-reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 960px) {
  :root { --section-py: 72px; }

  .about__grid { grid-template-columns: 1fr; gap: 48px; }
  .about__visual { order: -1; max-width: 480px; margin: 0 auto; width: 100%; }

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

  .stats__list { grid-template-columns: repeat(2, 1fr); }
  .stats__item { border-right: none; border-bottom: 1px solid rgba(255,255,255,.1); }
  .stats__item:nth-child(2n) { border-right: none; }
  .stats__item:last-child, .stats__item:nth-last-child(2):nth-child(2n+1) { border-bottom: none; }

  .footer__inner { flex-direction: column; gap: 40px; }
  .footer__nav { gap: 40px; }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }

  .header__nav {
    position: fixed;
    inset: 0;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
  }
  .header__nav.open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }
  .nav__list a {
    font-size: 1.1rem;
    color: var(--color-white) !important;
  }
  .nav__cta {
    border-color: var(--color-accent) !important;
    color: var(--color-accent) !important;
  }

  .hero__actions { flex-direction: column; align-items: flex-start; }
  .btn { width: 100%; max-width: 280px; }

  .process__step { grid-template-columns: 60px 1fr; gap: 16px; }
  .process__num { font-size: 1.8rem; }

  .stats__list { grid-template-columns: repeat(2, 1fr); }

  .footer__nav { flex-direction: column; gap: 24px; }
  .footer__nav ul { flex-direction: row; flex-wrap: wrap; gap: 16px 24px; }
}

@media (max-width: 480px) {
  :root {
    --container-px: 20px;
    --section-py: 56px;
  }

  .stats__list { grid-template-columns: 1fr 1fr; }
  .service-card { padding: 28px 24px; }
  .cta-section { padding: 80px 0; }
}