/* =========================================================================
   株式会社adhd — styles
   ダーク基調 / ブルー〜パープルのグラデ / 赤は差し色アクセント
   ========================================================================= */

:root {
  /* --- color: global --- */
  --bg-900: #0b1020;
  --bg-800: #11182e;
  --bg-700: #161f3a;
  --surface: #141c34;
  --surface-2: #1a2440;
  --border: #283357;

  --text-100: #f4f6fb;
  --text-200: #cdd5ec;
  --text-300: #9aa6c9;

  --blue: #00e0ff;
  --purple: #7c5cff;
  --accent-red: #ff4757;

  /* --- semantic --- */
  --grad: linear-gradient(120deg, var(--blue) 0%, var(--purple) 100%);
  --grad-soft: linear-gradient(120deg, rgba(0, 224, 255, 0.16), rgba(124, 92, 255, 0.16));

  /* --- spacing (4px grid) --- */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 12px;
  --sp-base: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  --sp-3xl: 80px;

  /* --- radius --- */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;

  /* --- shadow --- */
  --sh-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --sh-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --glow: 0 0 40px rgba(0, 224, 255, 0.18);

  --maxw: 1200px;
  --header-h: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  font-family: "Noto Sans JP", "Inter", system-ui, sans-serif;
  background: var(--bg-900);
  color: var(--text-200);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3 { color: var(--text-100); line-height: 1.25; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--sp-lg); }

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

/* skip link */
.skip-link {
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  background: var(--blue);
  color: #001018;
  padding: var(--sp-sm) var(--sp-base);
  border-radius: var(--r-sm);
  font-weight: 700;
  z-index: 200;
  transition: top 150ms ease-out;
}
.skip-link:focus { top: 8px; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 2px; }

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-sm);
  height: 44px;
  padding: 0 var(--sp-lg);
  border-radius: var(--r-md);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 120ms ease-out, box-shadow 150ms ease-out, background 150ms ease-out, border-color 150ms ease-out;
}
.btn-lg { height: 52px; padding: 0 var(--sp-xl); font-size: 1rem; }

.btn-primary {
  background: var(--grad);
  color: #00131a;
  box-shadow: var(--glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 50px rgba(0, 224, 255, 0.32); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border);
  color: var(--text-100);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--purple); background: rgba(124, 92, 255, 0.1); }

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(11, 16, 32, 0.55);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 200ms ease-out, border-color 200ms ease-out;
}
.site-header.scrolled { background: rgba(11, 16, 32, 0.92); border-bottom-color: var(--border); }

.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }

.brand { display: inline-flex; align-items: center; gap: var(--sp-sm); }
.brand-mark { display: inline-flex; filter: drop-shadow(0 0 8px rgba(0, 224, 255, 0.4)); }
.brand-text { font-family: "Inter", sans-serif; font-weight: 700; font-size: 1.4rem; color: var(--text-100); letter-spacing: -0.02em; }
.brand-dot { color: var(--blue); }

.site-nav { display: flex; align-items: center; gap: var(--sp-xl); }
.site-nav a { font-size: 0.95rem; color: var(--text-200); transition: color 120ms ease-out; }
.site-nav a:hover { color: var(--text-100); }
.site-nav .nav-cta {
  padding: var(--sp-sm) var(--sp-base);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-100);
}
.site-nav .nav-cta:hover { border-color: var(--blue); background: rgba(0, 224, 255, 0.08); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  cursor: pointer;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text-100); transition: transform 200ms ease, opacity 200ms ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
  padding: var(--sp-base) var(--sp-lg) var(--sp-lg);
  background: rgba(11, 16, 32, 0.98);
  border-bottom: 1px solid var(--border);
}
.mobile-nav[hidden] { display: none; }
.mobile-nav a { padding: var(--sp-md) 0; border-bottom: 1px solid var(--border); color: var(--text-100); }
.mobile-nav a:last-child { border-bottom: none; }

/* =========================================================================
   Hero
   ========================================================================= */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--header-h);
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 500px at 70% 30%, rgba(124, 92, 255, 0.16), transparent 60%),
    radial-gradient(700px 500px at 20% 70%, rgba(0, 224, 255, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(11, 16, 32, 0.3) 0%, rgba(11, 16, 32, 0.78) 100%);
}
.hero-inner { position: relative; z-index: 2; padding-top: var(--sp-2xl); padding-bottom: var(--sp-2xl); }

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  padding: var(--sp-xs) var(--sp-md);
  border: 1px solid rgba(0, 224, 255, 0.35);
  border-radius: 999px;
  margin-bottom: var(--sp-lg);
  background: rgba(0, 224, 255, 0.06);
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 700;
  margin: 0 0 var(--sp-lg);
  line-height: 1.12;
  letter-spacing: -0.03em;
}
.hero-lead {
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--text-200);
  margin-bottom: var(--sp-2xl);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-base); margin-bottom: var(--sp-3xl); }

.hero-stats { display: flex; flex-wrap: wrap; gap: var(--sp-2xl); margin: 0; }
.hero-stats div { display: flex; flex-direction: column; gap: var(--sp-xs); }
.hero-stats dt { order: 2; font-size: 0.85rem; color: var(--text-300); letter-spacing: 0.04em; }
.hero-stats dd {
  order: 1;
  margin: 0;
  font-family: "Inter", sans-serif;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--text-100);
  line-height: 1;
}
.hero-stats dd i { font-style: normal; font-size: 1.1rem; color: var(--blue); margin-left: 2px; }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  z-index: 2;
}
.scroll-cue span {
  position: absolute;
  left: 50%;
  top: 8px;
  width: 4px;
  height: 8px;
  margin-left: -2px;
  background: var(--blue);
  border-radius: 999px;
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

/* =========================================================================
   Section base
   ========================================================================= */
.section { padding: var(--sp-3xl) 0; }
.section-alt { background: var(--bg-800); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-eyebrow {
  font-family: "Inter", sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--purple);
  margin-bottom: var(--sp-md);
}
.section-title { font-size: clamp(1.7rem, 3.6vw, 2.4rem); font-weight: 700; margin: 0 0 var(--sp-base); }
.section-lead { max-width: 62ch; color: var(--text-200); margin-bottom: var(--sp-2xl); font-size: 1.05rem; }

/* =========================================================================
   Service cards
   ========================================================================= */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-lg); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-xl);
  transition: transform 200ms ease-out, border-color 200ms ease-out, box-shadow 200ms ease-out;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 200ms ease-out;
}
.card:hover { transform: translateY(-6px); border-color: var(--purple); box-shadow: var(--sh-lg); }
.card:hover::before { opacity: 1; }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  background: var(--grad-soft);
  color: var(--blue);
  margin-bottom: var(--sp-base);
}
.card h3 { font-size: 1.2rem; margin: 0 0 var(--sp-sm); }
.card p { color: var(--text-200); font-size: 0.98rem; }

/* =========================================================================
   Features
   ========================================================================= */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-xl); }
.feature { display: flex; gap: var(--sp-base); align-items: flex-start; }
.feature-num {
  font-family: "Inter", sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  flex-shrink: 0;
}
.feature h3 { font-size: 1.15rem; margin: 0 0 var(--sp-sm); }
.feature p { color: var(--text-200); font-size: 0.98rem; }

/* =========================================================================
   President message
   ========================================================================= */
.message-wrap { display: grid; grid-template-columns: 360px 1fr; gap: var(--sp-2xl); align-items: start; }
.message-photo { margin: 0; position: relative; }
.message-photo img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #1c2440, #0d1426);
  box-shadow: var(--sh-lg);
}
.message-photo::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--r-lg);
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  pointer-events: none;
}
.message-photo figcaption {
  margin-top: var(--sp-md);
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-300);
  letter-spacing: 0.04em;
}
.message-body { max-width: 60ch; display: flex; flex-direction: column; gap: var(--sp-base); }
.message-lead { font-size: 1.3rem; font-weight: 700; color: var(--text-100); line-height: 1.5; }
.message-body p { color: var(--text-200); font-size: 1.02rem; }
.message-sign { margin-top: var(--sp-sm); color: var(--text-100); font-weight: 700; }

/* =========================================================================
   Company table
   ========================================================================= */
.company-table {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface);
}
.company-table > div { display: grid; grid-template-columns: 200px 1fr; border-bottom: 1px solid var(--border); }
.company-table > div:last-child { border-bottom: none; }
.company-table dt { padding: var(--sp-base) var(--sp-lg); background: var(--surface-2); font-weight: 700; color: var(--text-100); margin: 0; }
.company-table dd { padding: var(--sp-base) var(--sp-lg); margin: 0; color: var(--text-200); }

/* =========================================================================
   CTA
   ========================================================================= */
.cta { padding: var(--sp-3xl) 0; position: relative; overflow: hidden; }
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(700px 400px at 50% 0%, rgba(124, 92, 255, 0.22), transparent 60%),
    radial-gradient(700px 400px at 50% 100%, rgba(0, 224, 255, 0.16), transparent 60%);
}
.cta-inner { position: relative; text-align: center; max-width: 760px; }
.cta-title { font-size: clamp(1.8rem, 4vw, 2.8rem); margin: 0 0 var(--sp-base); line-height: 1.2; }
.cta-lead { color: var(--text-200); font-size: 1.1rem; margin-bottom: var(--sp-2xl); }
.cta-actions { display: flex; flex-wrap: wrap; gap: var(--sp-base); justify-content: center; }

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer { background: var(--bg-800); border-top: 1px solid var(--border); padding: var(--sp-3xl) 0 var(--sp-lg); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--sp-xl); }
.footer-brand .brand-text { font-size: 1.6rem; }
.footer-brand p { color: var(--text-300); margin-top: var(--sp-sm); }
.footer-nav { display: flex; flex-wrap: wrap; gap: var(--sp-lg); align-items: center; }
.footer-nav a { color: var(--text-200); font-size: 0.95rem; transition: color 120ms ease-out; }
.footer-nav a:hover { color: var(--blue); }
.footer-bottom { margin-top: var(--sp-xl); padding-top: var(--sp-base); border-top: 1px solid var(--border); }
.footer-bottom small { color: var(--text-300); }

/* =========================================================================
   Reveal on scroll
   ========================================================================= */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 600ms ease-out, transform 600ms ease-out; }
.reveal.is-visible { opacity: 1; transform: none; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; gap: var(--sp-lg); }
  .message-wrap { grid-template-columns: 1fr; gap: var(--sp-xl); }
  .message-photo { max-width: 360px; margin: 0 auto; }
  .message-photo img { height: 320px; }
}

@media (max-width: 720px) {
  .site-nav { display: none; }
  .nav-toggle { display: flex; }
  .hero-stats { gap: var(--sp-xl); }
  .company-table > div { grid-template-columns: 1fr; }
  .company-table dt { border-bottom: 1px solid var(--border); }
  .sp-br { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  .reveal { opacity: 1; transform: none; }
}