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

:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-primary: #1c2b4a;
  --color-accent: #3d6bb5;
  --color-accent-light: #eef3fb;
  --color-green: #2e7d5e;
  --color-green-light: #e8f5f0;
  --color-text: #2c3e50;
  --color-text-muted: #6b7a8d;
  --color-border: #e8eaed;
  --color-hero-bg: #0f1c35;

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

  --radius: 12px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,.14);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

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

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

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===========================
   Utility
=========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

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

.section__header--left {
  text-align: left;
}

.section__label {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1.4;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===========================
   Buttons
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  background: #2f55a0;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(61,107,181,.35);
}

.btn--ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.6);
}
.btn--ghost:hover {
  background: rgba(255,255,255,.1);
  border-color: #fff;
}

.btn--lg {
  padding: 18px 48px;
  font-size: 16px;
}

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

.header.scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.header__logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.header__logo-en {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  color: #fff;
  letter-spacing: .06em;
  transition: color var(--transition);
}

.header__logo-ja {
  font-size: 10px;
  color: rgba(255,255,255,.7);
  letter-spacing: .1em;
  transition: color var(--transition);
}

.header.scrolled .header__logo-en { color: var(--color-primary); }
.header.scrolled .header__logo-ja { color: var(--color-text-muted); }

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}

.header__nav-list a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .06em;
  color: rgba(255,255,255,.85);
  transition: color var(--transition);
}

.header.scrolled .header__nav-list a { color: var(--color-text); }

.header__nav-list a:hover { color: var(--color-accent); }

.header__nav-cta {
  padding: 9px 22px;
  border-radius: 50px;
  background: var(--color-accent) !important;
  color: #fff !important;
}
.header.scrolled .header__nav-cta { background: var(--color-accent) !important; }
.header__nav-cta:hover { opacity: .88; }

.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.header__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}
.header.scrolled .header__hamburger span { background: var(--color-primary); }

/* ===========================
   Hero
=========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--color-hero-bg);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(61,107,181,.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 20%, rgba(46,125,94,.12) 0%, transparent 60%);
  pointer-events: none;
}

/* Grid pattern overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 100px 24px 80px;
  max-width: 780px;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .2em;
  color: rgba(255,255,255,.6);
  text-transform: uppercase;
  margin-bottom: 28px;
  padding: 8px 20px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50px;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5.5vw, 60px);
  font-weight: 500;
  color: #fff;
  line-height: 1.5;
  margin-bottom: 28px;
  letter-spacing: .02em;
}

.hero__title em {
  font-style: normal;
  color: #7eb8f5;
  position: relative;
}

.hero__desc {
  font-size: clamp(14px, 1.6vw, 16px);
  color: rgba(255,255,255,.65);
  line-height: 1.9;
  margin-bottom: 48px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 1;
}

.hero__scroll span {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .2em;
  color: rgba(255,255,255,.4);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255,255,255,.4), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===========================
   Features
=========================== */
.features {
  background: var(--color-surface);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px 36px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(61,107,181,.25);
}

.feature-card--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.feature-card--accent:hover {
  background: #2f55a0;
  border-color: #2f55a0;
  box-shadow: 0 12px 40px rgba(61,107,181,.3);
}

.feature-card__icon-wrap {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  border-radius: 14px;
  margin-bottom: 24px;
  color: var(--color-accent);
}

.feature-card--accent .feature-card__icon-wrap {
  background: rgba(255,255,255,.15);
  color: #fff;
}

.feature-card__title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1.55;
  margin-bottom: 16px;
}

.feature-card--accent .feature-card__title { color: #fff; }

.feature-card__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.85;
  margin-bottom: 24px;
}

.feature-card--accent .feature-card__desc { color: rgba(255,255,255,.8); }

.feature-card__desc strong {
  color: var(--color-primary);
  font-weight: 600;
}

.feature-card--accent .feature-card__desc strong { color: #fff; }

.feature-card__badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  padding: 6px 14px;
  border-radius: 50px;
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.feature-card--accent .feature-card__badge {
  background: rgba(255,255,255,.2);
  color: #fff;
}

/* ===========================
   Works
=========================== */
.works {
  background: var(--color-bg);
}

.works__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.work-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.work-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.work-card__visual {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #e8ecf0;
}

.work-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s cubic-bezier(.4,0,.2,1);
}

.work-card:hover .work-card__img {
  transform: scale(1.04);
}

.work-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15,28,53,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.work-card:hover .work-card__overlay { opacity: 1; }

.work-card__overlay-text {
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  letter-spacing: .08em;
  border: 1.5px solid rgba(255,255,255,.7);
  padding: 10px 28px;
  border-radius: 50px;
}

.work-card__body {
  padding: 32px;
}

.work-card__tags {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.tag {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 50px;
  letter-spacing: .04em;
}

.tag--blue { background: var(--color-accent-light); color: var(--color-accent); }
.tag--green { background: var(--color-green-light); color: var(--color-green); }
.tag--gray { background: #f0f2f5; color: #6b7a8d; }

.work-card__title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.work-card__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.85;
  margin-bottom: 20px;
}

.work-card__skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.work-card__skills li {
  font-size: 12px;
  padding: 4px 12px;
  background: #f5f6f8;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
}

.work-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: .04em;
  transition: gap var(--transition), opacity var(--transition);
}

.work-card__cta:hover { gap: 10px; opacity: .75; }

/* ===========================
   About
=========================== */
.about {
  background: var(--color-primary);
}

.about .section__label { color: rgba(255,255,255,.5); }
.about .section__title { color: #fff; }

.about__inner {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 80px;
  align-items: center;
}

.about__lead {
  font-size: 17px;
  color: rgba(255,255,255,.9);
  line-height: 1.85;
  margin-bottom: 20px;
  font-family: var(--font-serif);
}

.about__body {
  font-size: 14px;
  color: rgba(255,255,255,.6);
  line-height: 1.9;
  margin-bottom: 40px;
}

.about__skills {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.skill-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: rgba(255,255,255,.06);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,.08);
}

.skill-item__icon {
  font-size: 24px;
  flex-shrink: 0;
  margin-top: 2px;
}

.skill-item__title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.skill-item__desc {
  font-size: 13px;
  color: rgba(255,255,255,.5);
}

.about__card {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 36px 32px;
}

.about__card-label {
  font-size: 11px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: rgba(255,255,255,.45);
  margin-bottom: 16px;
  font-weight: 500;
}

.about__card-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.about__card-list li {
  font-size: 14px;
  color: rgba(255,255,255,.8);
  display: flex;
  align-items: center;
  gap: 10px;
}

.about__card-list li::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.about__card-divider {
  height: 1px;
  background: rgba(255,255,255,.1);
  margin-bottom: 28px;
}

/* ===========================
   Service
=========================== */
.service {
  background: var(--color-bg);
}

.service__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.service-card--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.service-card--accent:hover {
  background: #2f55a0;
  border-color: #2f55a0;
}

.service-card__num {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .15em;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.service-card--accent .service-card__num { color: rgba(255,255,255,.6); }

.service-card__title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}

.service-card--accent .service-card__title { color: #fff; }

.service-card__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.service-card--accent .service-card__desc { color: rgba(255,255,255,.75); }

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-card__list li {
  font-size: 13px;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-card--accent .service-card__list li { color: rgba(255,255,255,.85); }

.service-card__list li::before {
  content: '—';
  color: var(--color-accent);
  flex-shrink: 0;
}

.service-card--accent .service-card__list li::before { color: rgba(255,255,255,.5); }

/* ===========================
   Contact
=========================== */
.contact {
  background: linear-gradient(135deg, #eef3fb 0%, #f0f8f4 100%);
}

.contact__inner {
  text-align: center;
}

.contact__actions {
  margin-bottom: 20px;
}

.contact__note {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ===========================
   Footer
=========================== */
.footer {
  background: var(--color-primary);
  padding: 40px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__name {
  font-size: 14px;
  color: rgba(255,255,255,.7);
}

.footer__copy {
  font-size: 12px;
  color: rgba(255,255,255,.35);
}

/* ===========================
   Scroll Animations
=========================== */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s cubic-bezier(.4,0,.2,1), transform .7s cubic-bezier(.4,0,.2,1);
}

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

/* ===========================
   Responsive
=========================== */
@media (max-width: 900px) {
  .works__grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .features__grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .service__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .header__nav { display: none; }

  .header__nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    background: rgba(15,28,53,.97);
    z-index: 200;
    align-items: center;
    justify-content: center;
    gap: 0;
  }

  .header__nav.open .header__nav-list {
    flex-direction: column;
    gap: 0;
    align-items: center;
  }

  .header__nav.open .header__nav-list a {
    display: block;
    padding: 18px 0;
    font-size: 20px;
    color: #fff;
    letter-spacing: .06em;
    border-bottom: 1px solid rgba(255,255,255,.1);
    width: 200px;
    text-align: center;
  }

  .header__hamburger { display: flex; z-index: 300; }

  .hero__title { font-size: clamp(28px, 8vw, 40px); }

  .footer__inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .about__card { display: none; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; align-items: center; }
  .work-card__body { padding: 24px; }
  .service-card { padding: 32px 24px; }
}