/* ============================================================
   Core Technologies — corporate site
   Design: dark navy + blue/cyan gradient + cinematic glow
   ============================================================ */

:root {
  --bg: #060b18;
  --bg-2: #0a1730;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border: rgba(120, 160, 255, 0.14);
  --text: #eaf0ff;
  --muted: #9aa9c7;
  --muted-2: #6b7a9c;
  --accent: #3b82f6;
  --accent-2: #22d3ee;
  --grad: linear-gradient(100deg, #3b82f6 0%, #22d3ee 100%);
  --max: 1160px;
  --radius: 18px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: "Noto Sans JP", "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 30px; border-radius: 999px;
  font-weight: 700; font-size: 15px; letter-spacing: 0.02em;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s;
  cursor: pointer; border: 0; white-space: nowrap;
}
.btn__arrow { transition: transform 0.3s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }
.btn--primary {
  background: var(--grad); color: #051022;
  box-shadow: 0 10px 30px -8px rgba(59, 130, 246, 0.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -10px rgba(34, 211, 238, 0.6); }
.btn--ghost {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border);
}
.btn--ghost:hover { background: var(--surface-2); transform: translateY(-2px); }

/* ===== Header ===== */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background 0.4s, backdrop-filter 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
.header.is-scrolled {
  background: rgba(6, 11, 24, 0.72);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; }
.brand__mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: var(--grad);
  box-shadow: 0 0 18px rgba(34, 211, 238, 0.5);
  position: relative;
}
.brand__mark::after {
  content: ""; position: absolute; inset: 6px;
  border-radius: 3px; background: var(--bg);
}
.brand__text { font-size: 14px; letter-spacing: 0.14em; font-family: "Inter", sans-serif; }

.nav { display: flex; align-items: center; gap: 8px; }
.nav__link {
  padding: 9px 16px; font-size: 14px; font-weight: 500; color: var(--muted);
  border-radius: 999px; transition: color 0.25s, background 0.25s;
}
.nav__link:hover { color: var(--text); }
.nav__link--cta {
  color: var(--text); border: 1px solid var(--border);
  background: var(--surface);
}
.nav__link--cta:hover { background: var(--surface-2); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  overflow: hidden; padding-top: 72px;
}
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.hero__bg::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(1200px 700px at 75% 15%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(1000px 600px at 15% 80%, rgba(59, 130, 246, 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 55%, var(--bg) 100%);
}
.hero__glow {
  position: absolute; top: -10%; right: -5%; width: 60vw; height: 60vw;
  background: conic-gradient(from 180deg, rgba(59,130,246,0.18), rgba(34,211,238,0.12), rgba(99,102,241,0.16), rgba(59,130,246,0.18));
  filter: blur(90px); border-radius: 50%; opacity: 0.7;
  animation: drift 18s ease-in-out infinite alternate;
}
@keyframes drift { from { transform: translate(0,0) scale(1); } to { transform: translate(-6%, 4%) scale(1.1); } }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(120,160,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,160,255,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 40%, transparent 100%);
}
.hero__inner { position: relative; z-index: 1; padding: 60px 24px; }
.hero__eyebrow {
  font-family: "Inter", sans-serif; font-weight: 600; letter-spacing: 0.28em;
  font-size: 13px; color: var(--accent-2); margin-bottom: 26px; text-transform: uppercase;
}
.hero__title {
  font-size: clamp(38px, 6.4vw, 78px); font-weight: 900; line-height: 1.18;
  letter-spacing: 0.01em; margin-bottom: 28px;
}
.hero__lead { max-width: 600px; color: var(--muted); font-size: clamp(15px, 1.6vw, 17px); margin-bottom: 40px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero__scroll {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%); z-index: 1;
  width: 26px; height: 42px; border: 2px solid var(--border); border-radius: 999px;
}
.hero__scroll span {
  position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px; border-radius: 4px; background: var(--accent-2);
  animation: scroll 1.8s ease-in-out infinite;
}
@keyframes scroll { 0%,100% { opacity: 0; top: 8px; } 50% { opacity: 1; top: 20px; } }

/* ===== Sections ===== */
.section { position: relative; padding: clamp(80px, 11vw, 140px) 0; }
.section__head { max-width: 680px; margin-bottom: 64px; }
.section__eyebrow {
  font-family: "Inter", sans-serif; font-weight: 600; letter-spacing: 0.28em;
  font-size: 12px; color: var(--accent-2); text-transform: uppercase; display: block; margin-bottom: 14px;
}
.section__title { font-size: clamp(28px, 4vw, 44px); font-weight: 800; line-height: 1.3; }
.section__desc { margin-top: 18px; color: var(--muted); font-size: 16px; }

/* ===== Service cards ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  position: relative; padding: 38px 32px 34px; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border); overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s;
}
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity 0.4s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 24px 50px -24px rgba(34, 211, 238, 0.4); }
.card:hover::before { opacity: 1; }
.card__num {
  font-family: "Inter", sans-serif; font-weight: 800; font-size: 15px;
  color: transparent; background: var(--grad); -webkit-background-clip: text; background-clip: text;
  letter-spacing: 0.08em;
}
.card__title { font-size: 21px; font-weight: 700; margin: 14px 0 14px; }
.card__text { color: var(--muted); font-size: 14.5px; margin-bottom: 20px; }
.card__list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.card__list li {
  position: relative; padding-left: 22px; font-size: 13.5px; color: var(--muted-2); line-height: 1.7;
}
.card__list li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 10px; height: 10px;
  border-radius: 3px; background: var(--grad);
}

/* ===== Strengths ===== */
.strengths { background: linear-gradient(180deg, transparent, rgba(10, 23, 48, 0.5), transparent); }
.strength-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.strength {
  padding: 36px 30px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface);
  transition: transform 0.4s var(--ease), background 0.4s;
}
.strength:hover { transform: translateY(-4px); background: var(--surface-2); }
.strength__icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: rgba(34, 211, 238, 0.1); color: var(--accent-2); font-size: 20px; margin-bottom: 20px;
  border: 1px solid var(--border);
}
.strength__title { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.strength__text { color: var(--muted); font-size: 14.5px; }

/* ===== Company ===== */
.company-table {
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  background: var(--surface);
}
.company-row { display: grid; grid-template-columns: 200px 1fr; border-bottom: 1px solid var(--border); }
.company-row:last-child { border-bottom: 0; }
.company-row dt {
  padding: 22px 28px; font-weight: 700; font-size: 14.5px;
  background: rgba(255, 255, 255, 0.02); color: var(--text);
}
.company-row dd { padding: 22px 28px; color: var(--muted); font-size: 15px; }

/* ===== Contact ===== */
.contact__inner { max-width: 860px; }
.form { display: flex; flex-direction: column; gap: 22px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.form__field { display: flex; flex-direction: column; gap: 9px; }
.form__label { font-size: 13.5px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.form__label em {
  font-style: normal; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 5px;
  background: rgba(59, 130, 246, 0.18); color: var(--accent-2);
}
.form input, .form textarea {
  width: 100%; padding: 14px 16px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  font-family: inherit; font-size: 15px; transition: border-color 0.25s, box-shadow 0.25s;
}
.form input::placeholder, .form textarea::placeholder { color: var(--muted-2); }
.form input:focus, .form textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}
.form textarea { resize: vertical; }
.form__submit { margin-top: 6px; }
.form__note { font-size: 12.5px; color: var(--muted-2); }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 50px 0; background: var(--bg-2); }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.brand--footer { opacity: 0.95; }
.footer__nav { display: flex; gap: 22px; }
.footer__nav a { font-size: 14px; color: var(--muted); transition: color 0.25s; }
.footer__nav a:hover { color: var(--text); }
.footer__copy { font-size: 13px; color: var(--muted-2); font-family: "Inter", sans-serif; }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .cards, .strength-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav-toggle { display: flex; }
  .nav.is-open {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute; top: 72px; left: 0; right: 0; padding: 16px 24px 24px;
    background: rgba(6, 11, 24, 0.96); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
  }
  .nav.is-open .nav__link { padding: 14px 16px; }
  .nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}
@media (max-width: 640px) {
  .form__row { grid-template-columns: 1fr; }
  .company-row { grid-template-columns: 1fr; }
  .company-row dt { padding-bottom: 6px; }
  .company-row dd { padding-top: 6px; }
  .hero__actions { width: 100%; }
  .hero__actions .btn { flex: 1; justify-content: center; }
}