/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* off-canvas nav (translateX(100%)) がページ幅を広げないようクリップする。
   overflow-x: hidden だと position: sticky が壊れるため clip を使う */
html { overflow-x: clip; }
@supports not (overflow: clip) {
  html, body { overflow-x: hidden; }
}
body.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--color-bg-base);
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
}
p { margin: 0 0 var(--space-sm); }
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}
@media (max-width: 480px) {
  .container { padding: 0 var(--space-sm); }
}

/* ===== Section rhythm ===== */
.section {
  padding: var(--space-xl) 0;
}
.section--sub {
  background: var(--color-bg-sub);
}
.section-heading {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin-bottom: var(--space-md);
}
.section-lead {
  color: var(--color-text-sub);
  font-size: 1.05rem;
  max-width: 760px;
}
.text-sub { color: var(--color-text-sub); }
.text-mono { font-family: var(--font-mono); }

/* ===== Scroll fade-in ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .fade-in, .fade-in.is-visible {
    transition: none;
    transform: none;
    opacity: 1;
  }
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.logo {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}
.main-nav > ul {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.main-nav > ul > li > a,
.nav-dropdown-toggle {
  background: none;
  border: none;
  color: var(--color-text-main);
  font-size: 0.95rem;
  padding: var(--space-xs) 0;
}
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--color-bg-sub);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast);
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
}
.nav-dropdown-menu li a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}
.nav-dropdown-menu li a:hover { background: rgba(0, 212, 184, 0.1); color: var(--color-accent-1); }

.btn-cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-accent-1), var(--color-accent-2));
  color: #05080C;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 999px;
  border: none;
  font-size: 0.95rem;
  white-space: nowrap;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 184, 0.25);
}
.cta-microcopy {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  color: var(--color-text-sub);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--color-text-main);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 1024px) {
  /* off-canvas: transformで画面外に置くとページの横幅が2倍になるため、
     レイアウト上は画面内に置いたままclip-pathで隠す(横スクロールが発生しない) */
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-base);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg) var(--space-md);
    clip-path: inset(0 0 0 100%);
    visibility: hidden;
    transition: clip-path var(--transition-base), visibility 0s 0.6s;
    overflow-y: auto;
  }
  .main-nav.is-open {
    clip-path: inset(0 0 0 0);
    visibility: visible;
    transition: clip-path var(--transition-base), visibility 0s 0s;
  }
  @media (prefers-reduced-motion: reduce) {
    .main-nav { transition: none; }
  }
  .main-nav > ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .main-nav > ul > li {
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .main-nav > ul > li > a,
  .nav-dropdown-toggle {
    width: 100%;
    text-align: left;
    padding: var(--space-md) 0;
    font-size: 1.1rem;
  }
  .nav-dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    display: none;
    background: none;
    border: none;
    padding: 0 0 var(--space-sm) var(--space-sm);
  }
  .nav-dropdown.is-open .nav-dropdown-menu { display: block; }
  .hamburger { display: flex; }
  .header-inner .btn-cta--header { display: none; }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--color-bg-base);
  background-image: var(--hero-overlay), var(--img-hero-bg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero--compact { min-height: 420px; }
.hero--service-app-development { background-image: var(--hero-overlay), var(--img-service-app-development); }
.hero--service-training { background-image: var(--hero-overlay), var(--img-service-training); }
.hero--service-security { background-image: var(--hero-overlay), var(--img-service-security); }
.hero-inner {
  position: relative;
  z-index: 2;
  padding: var(--space-xl) 0;
}
.hero-title-line {
  display: block;
  font-size: clamp(2rem, 6vw, 3.6rem);
  opacity: 0;
  transform: translateY(40px) scale(1.04);
  filter: blur(6px);
  animation: heroTitleIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.hero-title-line--1 { animation-delay: 0.1s; }
.hero-title-line--2 { animation-delay: 0.35s; color: var(--color-accent-1); }
@keyframes heroTitleIn {
  0% { opacity: 0; transform: translateY(40px) scale(1.04); filter: blur(6px); }
  60% { opacity: 1; }
  100% { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}
.hero-subcopy {
  margin-top: var(--space-md);
  max-width: 620px;
  color: var(--color-text-sub);
  font-size: 1.05rem;
}
.hero-cta { margin-top: var(--space-lg); }
@media (prefers-reduced-motion: reduce) {
  .hero-title-line { animation: none; opacity: 1; transform: none; filter: none; }
}

/* Signature graphic: recurring shield/circuit motif across all hero sections */
.signature-graphic {
  position: absolute;
  right: -8%;
  top: 50%;
  transform: translateY(-50%);
  width: min(46vw, 620px);
  height: auto;
  opacity: 0.55;
  z-index: 1;
  pointer-events: none;
  transition: transform 0.2s ease-out;
}
.sg-shield { animation: sgPulse 6s ease-in-out infinite; }
.sg-circuit circle { animation: sgBlink 3.2s ease-in-out infinite; }
.sg-circuit circle:nth-child(2) { animation-delay: 0.6s; }
.sg-circuit circle:nth-child(3) { animation-delay: 1.2s; }
@keyframes sgPulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 0.9; }
}
@keyframes sgBlink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}
@media (max-width: 768px) {
  .signature-graphic { width: 70vw; opacity: 0.3; right: -10%; }
}
@media (prefers-reduced-motion: reduce) {
  .sg-shield, .sg-circuit circle { animation: none; }
  .signature-graphic { transition: none; }
}

/* ===== Philosophy (2-column) ===== */
.philosophy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}
.philosophy-visual {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-sub);
  background-image: var(--img-philosophy);
  background-size: cover;
  background-position: center;
  border: 1px solid rgba(255,255,255,0.06);
}
.philosophy-text .pull-quote {
  color: var(--color-accent-1);
  font-weight: 700;
  font-size: 1.15rem;
  border-left: 3px solid var(--color-accent-1);
  padding-left: var(--space-sm);
  margin: var(--space-md) 0;
}
@media (max-width: 768px) {
  .philosophy { grid-template-columns: 1fr; gap: var(--space-lg); }
}

/* ===== Service cards (top page) ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.service-card {
  display: block;
  background: var(--color-bg-sub);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent-1);
}
.service-card-icon { width: 56px; height: 56px; object-fit: contain; margin-bottom: var(--space-md); }
.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}
.service-card p { color: var(--color-text-sub); font-size: 0.95rem; }
@media (max-width: 1024px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ===== Service detail pages ===== */
.service-header {
  min-height: 360px;
}
/* サービスページのH1 2行目はサブタイトル扱い(メインコピーと同サイズだと巨大すぎる) */
.service-header .hero-title-line--2 {
  font-size: clamp(1.05rem, 2.6vw, 1.5rem);
  margin-top: var(--space-xs);
  letter-spacing: 0.02em;
}
.approach-media {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-lg);
  align-items: center;
}
.approach-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.06);
}
@media (max-width: 768px) {
  .approach-media { grid-template-columns: 1fr; }
}
.list-check {
  margin-top: var(--space-md);
}
.list-check li {
  position: relative;
  padding-left: 28px;
  margin-bottom: var(--space-sm);
  color: var(--color-text-sub);
}
.list-check li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--color-accent-1), var(--color-accent-2));
}
.service-block { margin-top: var(--space-lg); }
.service-block h2 { margin-bottom: var(--space-sm); }
.cta-band {
  text-align: center;
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-sub);
  background-image: linear-gradient(rgba(11,15,20,0.6), rgba(11,15,20,0.6)), url(../images/cta-band-bg.webp);
  background-size: cover;
  background-position: center;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.cta-band .section-heading { margin-bottom: var(--space-md); }

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: var(--space-md) 0;
}
.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text-main);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0;
}
.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-accent-1);
  transition: transform var(--transition-fast);
}
.faq-item.is-open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  color: var(--color-text-sub);
  transition: max-height var(--transition-fast);
}
.faq-item.is-open .faq-answer { max-height: 300px; padding-top: var(--space-sm); }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-sub);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-xl);
  flex-wrap: wrap;
  padding-bottom: var(--space-lg);
}
.footer-logo {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.footer-company p { color: var(--color-text-sub); font-size: 0.9rem; margin-bottom: 4px; }
.footer-nav ul { display: flex; flex-direction: column; gap: var(--space-xs); }
.footer-nav a { color: var(--color-text-sub); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--color-accent-1); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: var(--space-md) 0;
  font-size: 0.8rem;
  color: var(--color-text-sub);
  font-family: var(--font-mono);
}
@media (max-width: 768px) {
  .footer-inner { flex-direction: column; gap: var(--space-md); }
}