/* ============================================
   VARIABLES
   ============================================ */
:root {
  --clr-dark:       #070E1C;
  --clr-dark-2:     #0B1327;
  --clr-navy:       #0F1C3F;
  --clr-blue-700:   #1D4ED8;
  --clr-blue-600:   #2563EB;
  --clr-blue-500:   #3B82F6;
  --clr-blue-400:   #60A5FA;
  --clr-blue-100:   #DBEAFE;
  --clr-blue-50:    #EFF6FF;
  --clr-white:      #FFFFFF;
  --clr-gray-50:    #F8FAFC;
  --clr-gray-100:   #F1F5F9;
  --clr-gray-200:   #E2E8F0;
  --clr-gray-400:   #94A3B8;
  --clr-gray-500:   #64748B;
  --clr-gray-600:   #475569;
  --clr-gray-800:   #1E293B;
  --clr-gray-900:   #0F172A;

  --font-sans: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-en:   'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm:   0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-lg:   0 12px 40px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-blue: 0 8px 32px rgba(37, 99, 235, 0.3);

  --transition:      0.25s ease;
  --transition-slow: 0.55s cubic-bezier(0.16, 1, 0.3, 1);

  --header-h: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--clr-gray-900);
  background: var(--clr-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img  { max-width: 100%; height: auto; display: block; }
a    { color: inherit; text-decoration: none; transition: color var(--transition); }
ul   { list-style: none; }
em   { font-style: normal; }

/* ============================================
   CONTAINER
   ============================================ */
.container {
  width: 100%;
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .875rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .9375rem;
  letter-spacing: .02em;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--clr-blue-600);
  color: var(--clr-white);
  border-color: var(--clr-blue-600);
}
.btn--primary:hover {
  background: var(--clr-blue-700);
  border-color: var(--clr-blue-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
}
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  background: transparent;
  color: rgba(255,255,255,.8);
  border-color: rgba(255,255,255,.3);
}
.btn--ghost:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.6);
  color: var(--clr-white);
  transform: translateY(-2px);
}
.btn--ghost:active { transform: translateY(0); }

/* ============================================
   LOGO
   ============================================ */
.header__logo-text {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: .9375rem;
  letter-spacing: .14em;
  color: var(--clr-white);
  transition: color var(--transition);
}
.header.is-scrolled .header__logo-text {
  color: var(--clr-gray-900);
}

.footer__logo-text {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: .875rem;
  letter-spacing: .14em;
  color: rgba(255,255,255,.88);
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.is-scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(0,0,0,.08);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* --- Logo color states --- */
.header__logo {
  display: flex;
  align-items: center;
  gap: .625rem;
  margin-right: auto;
}

/* --- Nav --- */
.header__nav { display: flex; align-items: center; }

.header__nav-list {
  display: flex;
  gap: .25rem;
}

.header__nav-link {
  display: block;
  padding: .5rem .875rem;
  font-size: .875rem;
  font-weight: 500;
  color: rgba(255,255,255,.75);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  letter-spacing: .02em;
}
.header__nav-link:hover {
  color: var(--clr-white);
  background: rgba(255,255,255,.1);
}

.header.is-scrolled .header__nav-link       { color: var(--clr-gray-600); }
.header.is-scrolled .header__nav-link:hover { color: var(--clr-blue-600); background: var(--clr-blue-50); }

/* --- Hamburger --- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.hamburger:hover { background: rgba(255,255,255,.08); }

.hamburger__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: all var(--transition);
}
.header.is-scrolled .hamburger__line { background: var(--clr-gray-800); }

.hamburger.is-open .hamburger__line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open .hamburger__line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.is-open .hamburger__line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100svh;
  min-height: 100vh;
  background-color: var(--clr-dark);
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--header-h);
}

/* Background layers */
.hero__bg { position: absolute; inset: 0; pointer-events: none; }

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, black 30%, transparent 100%);
}

.hero__bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
.hero__bg-orb--1 {
  width: 640px; height: 640px;
  background: radial-gradient(circle, rgba(37,99,235,.38) 0%, transparent 70%);
  top: -220px; right: -80px;
  animation: orb-float 9s ease-in-out infinite alternate;
}
.hero__bg-orb--2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(96,165,250,.18) 0%, transparent 70%);
  bottom: -80px; left: 8%;
  animation: orb-float 11s ease-in-out infinite alternate-reverse;
}
.hero__bg-orb--3 {
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(29,78,216,.28) 0%, transparent 70%);
  top: 35%; left: 28%;
  animation: orb-float 13s ease-in-out infinite alternate;
}

@keyframes orb-float {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(28px, 18px) scale(1.06); }
}

/* Hero content */
.hero__inner {
  position: relative;
  z-index: 1;
  padding-top: 4rem;
  padding-bottom: 7rem;
}

.hero__eyebrow {
  font-family: var(--font-en);
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--clr-blue-400);
  text-transform: uppercase;
  margin-bottom: 1.625rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--clr-blue-400);
}

.hero__title {
  font-size: clamp(2.125rem, 4.5vw, 3.875rem);
  font-weight: 900;
  line-height: 1.22;
  color: var(--clr-white);
  letter-spacing: -.025em;
  margin-bottom: 1.75rem;
}

.hero__title-accent {
  color: var(--clr-blue-400);
}

.hero__lead {
  font-size: 1rem;
  font-weight: 300;
  color: rgba(255,255,255,.6);
  line-height: 2;
  max-width: 580px;
  margin-bottom: 2.75rem;
  letter-spacing: .02em;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  z-index: 1;
}
.hero__scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,.35));
  animation: scroll-draw 2.2s ease-in-out infinite;
}
@keyframes scroll-draw {
  0%   { transform: scaleY(0); transform-origin: top;    opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top;    opacity: 1; }
  51%  { transform: scaleY(1); transform-origin: bottom; opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}
.hero__scroll-text {
  font-family: var(--font-en);
  font-size: .5625rem;
  letter-spacing: .22em;
  color: rgba(255,255,255,.3);
}
.pc-br { display: inline; }

/* ============================================
   SECTION COMMON
   ============================================ */
.section { padding-block: 6rem; }

.section-header {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: 4rem;
}

.section-eyebrow {
  display: block;
  font-family: var(--font-en);
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--clr-blue-600);
  text-transform: uppercase;
  margin-bottom: .875rem;
}

.section-title {
  font-size: clamp(1.625rem, 3vw, 2.375rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--clr-gray-900);
  letter-spacing: -.02em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: .9375rem;
  color: var(--clr-gray-500);
  line-height: 1.85;
}

/* ============================================
   SERVICE SECTION
   ============================================ */
.service-section { background: var(--clr-gray-50); }

.service-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  border: 1px solid var(--clr-gray-200);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.service-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--clr-blue-50) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-blue-100);
}
.service-card:hover::after { opacity: 1; }

.service-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.375rem;
  position: relative;
  z-index: 1;
}

.service-card__number {
  font-family: var(--font-en);
  font-size: 3.25rem;
  font-weight: 900;
  color: var(--clr-gray-100);
  line-height: 1;
  letter-spacing: -.06em;
  transition: color var(--transition-slow);
  user-select: none;
}
.service-card:hover .service-card__number { color: var(--clr-blue-100); }

.service-card__icon {
  width: 52px;
  height: 52px;
  background: var(--clr-blue-50);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-blue-600);
  flex-shrink: 0;
  transition: all var(--transition);
}
.service-card:hover .service-card__icon {
  background: var(--clr-blue-600);
  color: var(--clr-white);
  transform: rotate(-6deg) scale(1.05);
}

.service-card__title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--clr-gray-900);
  margin-bottom: .5rem;
  letter-spacing: -.01em;
  position: relative;
  z-index: 1;
}

.service-card__lead {
  font-size: .875rem;
  font-weight: 600;
  color: var(--clr-blue-600);
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.service-card__desc {
  font-size: .875rem;
  color: var(--clr-gray-600);
  line-height: 1.85;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  position: relative;
  z-index: 1;
}
.service-card__list li {
  font-size: .8125rem;
  color: var(--clr-gray-500);
  padding-left: 1.125rem;
  position: relative;
  line-height: 1.65;
}
.service-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: .6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--clr-blue-400);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section { background: var(--clr-white); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 860px;
  margin-inline: auto;
}

.about-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.875rem;
  border-radius: var(--radius-md);
  background: var(--clr-gray-50);
  border: 1px solid var(--clr-gray-100);
  transition: all var(--transition-slow);
}
.about-item:hover {
  background: var(--clr-blue-50);
  border-color: var(--clr-blue-100);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.about-item__icon-wrap {
  width: 50px;
  height: 50px;
  min-width: 50px;
  background: var(--clr-white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-blue-600);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.about-item:hover .about-item__icon-wrap {
  background: var(--clr-blue-600);
  color: var(--clr-white);
  box-shadow: var(--shadow-blue);
}

.about-item__body { flex: 1; }

.about-item__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-gray-900);
  margin-bottom: .5rem;
  letter-spacing: -.01em;
}

.about-item__desc {
  font-size: .875rem;
  color: var(--clr-gray-500);
  line-height: 1.8;
}

/* ============================================
   CLIENTS SECTION
   ============================================ */
.clients-section {
  background: var(--clr-gray-50);
  padding-block: 5rem;
}

.clients-logo-wrap {
  max-width: 820px;
  margin-inline: auto;
  text-align: center;
}

.clients-logo-img {
  display: inline-block;
  max-width: 100%;
  height: auto;
  /* 白背景の画像なので影でカードっぽく見せる */
  filter: grayscale(20%);
  opacity: .9;
  transition: opacity var(--transition), filter var(--transition);
}
.clients-logo-img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* ============================================
   COMPANY SECTION
   ============================================ */
.company-section {
  background: var(--clr-dark);
  position: relative;
  overflow: hidden;
}

.company-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,.04) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}

.company-section .section-eyebrow { color: var(--clr-blue-400); }
.company-section .section-title   { color: var(--clr-white); }

.company-table-wrap {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.09);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table tr {
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background var(--transition);
}
.company-table tr:last-child { border-bottom: none; }
.company-table tr:hover { background: rgba(59,130,246,.07); }

.company-table th {
  width: 220px;
  padding: 1.375rem 2rem;
  text-align: left;
  font-size: .8125rem;
  font-weight: 500;
  color: rgba(255,255,255,.4);
  letter-spacing: .04em;
  white-space: nowrap;
  vertical-align: top;
  border-right: 1px solid rgba(255,255,255,.06);
}

.company-table td {
  padding: 1.375rem 2rem;
  font-size: .9375rem;
  color: rgba(255,255,255,.88);
  line-height: 1.7;
}

/* Map */
.company-map-wrap {
  max-width: 760px;
  margin-inline: auto;
  margin-top: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.09);
}
.company-map-wrap iframe {
  display: block;
  width: 100%;
}
.company-map-wrap {
  -webkit-filter: grayscale(100%);
  -moz-filter: grayscale(100%);
  -ms-filter: grayscale(100%);
  -o-filter: grayscale(100%);
  filter: grayscale(100%);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--clr-dark-2);
  border-top: 1px solid rgba(255,255,255,.06);
}

.footer__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 3rem;
  padding-top: 3rem;
  padding-bottom: 2.5rem;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: .625rem;
  margin-bottom: 1rem;
}

.footer__tagline {
  font-size: .8125rem;
  color: rgba(255,255,255,.3);
  line-height: 1.7;
  max-width: 240px;
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  text-align: right;
}
.footer__nav-list a {
  font-size: .875rem;
  color: rgba(255,255,255,.4);
  transition: color var(--transition);
}
.footer__nav-list a:hover { color: var(--clr-blue-400); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding-block: 1.25rem;
}
.footer__copyright {
  font-size: .75rem;
  color: rgba(255,255,255,.18);
  text-align: center;
  letter-spacing: .05em;
}

/* ============================================
   FADE-IN ANIMATION
   ============================================ */
.js-fade {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.js-fade.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.service-cards .js-fade:nth-child(2) { transition-delay: .15s; }
.service-cards .js-fade:nth-child(3) { transition-delay: .30s; }
.about-grid    .js-fade:nth-child(2) { transition-delay: .10s; }
.about-grid    .js-fade:nth-child(3) { transition-delay: .20s; }
.about-grid    .js-fade:nth-child(4) { transition-delay: .30s; }

/* ============================================
   RESPONSIVE — TABLET (≤ 1024px)
   ============================================ */
@media (max-width: 1024px) {
  .service-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .service-cards .service-card:last-child {
    grid-column: 1 / -1;
    max-width: 480px;
    margin-inline: auto;
    width: 100%;
  }
}

/* ============================================
   RESPONSIVE — MOBILE (≤ 768px)
   ============================================ */
@media (max-width: 768px) {
  .section { padding-block: 4rem; }

  /* Mobile nav */
  .header__nav {
    position: fixed;
    top: var(--header-h);
    inset-inline: 0;
    background: rgba(7, 14, 28, .97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.25rem 1.5rem 2rem;
    transform: translateY(-105%);
    transition: transform .35s cubic-bezier(.16,1,.3,1);
    border-top: 1px solid rgba(255,255,255,.07);
  }
  .header__nav.is-open { transform: translateY(0); }

  .header.is-scrolled .header__nav {
    background: rgba(255,255,255,.97);
    border-top: 1px solid var(--clr-gray-100);
  }
  .header.is-scrolled .header__nav .header__nav-link {
    color: var(--clr-gray-700);
  }
  .header.is-scrolled .header__nav .header__nav-link:hover {
    color: var(--clr-blue-600);
    background: var(--clr-blue-50);
  }

  .header__nav-list { flex-direction: column; gap: .25rem; }
  .header__nav-link { font-size: 1rem; padding: .875rem 1rem; }

  .hamburger { display: flex; }

  /* Hero */
  .hero__title { font-size: 2.25rem; }
  .hero__lead  { font-size: .9375rem; }
  .pc-br       { display: none; }

  /* Services */
  .service-cards { grid-template-columns: 1fr; }
  .service-cards .service-card:last-child {
    grid-column: auto;
    max-width: none;
  }

  /* About */
  .about-grid { grid-template-columns: 1fr; }

  /* Footer */
  .footer__top {
    flex-direction: column;
    gap: 1.5rem;
  }
  .footer__nav-list {
    text-align: left;
    flex-direction: row;
    flex-wrap: wrap;
    gap: .5rem 1.5rem;
  }
}

/* ============================================
   RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================================ */
@media (max-width: 480px) {
  .hero__title    { font-size: 1.875rem; }
  .hero__buttons  { flex-direction: column; }
  .btn            { width: 100%; }

  .service-card { padding: 1.75rem 1.5rem; }

  .about-item { flex-direction: column; }

  /* Company table stacked */
  .company-table,
  .company-table tbody,
  .company-table tr,
  .company-table th,
  .company-table td { display: block; }

  .company-table tr {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,.06);
  }
  .company-table tr:last-child { border-bottom: none; }

  .company-table th {
    width: 100%;
    padding: 0 0 .25rem;
    border-right: none;
    font-size: .6875rem;
    letter-spacing: .06em;
  }
  .company-table td {
    width: 100%;
    padding: 0;
    font-size: .9375rem;
  }
}