/* ============================================================
   MODERN CREATIVE — koa ベーシックLPテンプレート
   色・フォント・余白は :root の変数を変えるだけで調整できます
============================================================ */
:root {
  /* カラー（変更ポイント） */
  --c-bg: #101820;
  --c-main: #F5F7FA;
  --c-accent: #46D9E8;
  --c-bg-sub: #1B2933;
  --c-muted: #91A6B2;
  --c-on-accent: #101820; /* アクセント背景上の文字色 */
  --c-line: rgba(145, 166, 178, 0.28);

  /* フォント */
  --font-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --font-display: "Space Grotesk", "Noto Sans JP", system-ui, sans-serif;

  /* レイアウト */
  --gutter: clamp(20px, 5vw, 64px);
  --max: 1200px;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-main);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }

:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 3px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--c-accent); color: var(--c-on-accent);
  padding: 10px 16px; font-weight: 700; text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--gutter);
  background: linear-gradient(to bottom, rgba(16,24,32,0.92), rgba(16,24,32,0));
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark {
  width: 18px; height: 18px; background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, 40% 100%, 0 100%);
}
.brand-name { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.08em; font-size: 0.95rem; }

.menu-toggle {
  display: inline-flex; align-items: center; gap: 10px;
  background: none; border: 1px solid var(--c-line); color: var(--c-main);
  padding: 8px 14px; font: inherit; font-size: 0.8rem; cursor: pointer; border-radius: 999px;
}
.menu-toggle-bars { position: relative; width: 16px; height: 10px; border-top: 2px solid currentColor; border-bottom: 2px solid currentColor; transition: border-color .2s; }
.menu-toggle[aria-expanded="true"] .menu-toggle-bars { border-color: var(--c-accent); }

.site-nav {
  position: fixed; inset: var(--header-h) 0 auto 0;
  background: var(--c-bg-sub);
  border-bottom: 1px solid var(--c-line);
  padding: 8px var(--gutter) 24px;
  display: none;
}
.site-nav.is-open { display: block; }
.site-nav a { display: block; padding: 14px 0; text-decoration: none; border-bottom: 1px solid var(--c-line); }
.site-nav a:hover { color: var(--c-accent); }
.site-nav .nav-cta { color: var(--c-accent); font-weight: 700; border-bottom: 0; }

@media (min-width: 860px) {
  .menu-toggle { display: none; }
  .site-nav { position: static; display: block; background: none; border: 0; padding: 0; }
  .site-nav ul { display: flex; align-items: center; gap: 28px; }
  .site-nav a { padding: 8px 0; border: 0; font-size: 0.875rem; }
  .site-nav .nav-cta {
    padding: 8px 18px; border: 1px solid var(--c-accent); border-radius: 999px;
    transition: background .2s, color .2s;
  }
  .site-nav .nav-cta:hover { background: var(--c-accent); color: var(--c-on-accent); }
}

/* ---------- Buttons ---------- */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  min-height: 52px; padding: 0 32px; overflow: hidden;
  border: 2px solid var(--c-accent); color: var(--c-accent);
  text-decoration: none; font-weight: 700; letter-spacing: 0.04em;
  transition: color .3s;
}
.btn::before {
  content: ""; position: absolute; inset: 0; background: var(--c-accent);
  transform: translateX(-101%); transition: transform .35s ease;
}
.btn span { position: relative; z-index: 1; }
.btn:hover, .btn:focus-visible { color: var(--c-on-accent); }
.btn:hover::before, .btn:focus-visible::before { transform: translateX(0); }

.btn-dark { border-color: var(--c-on-accent); color: var(--c-on-accent); }
.btn-dark::before { background: var(--c-on-accent); }
.btn-dark:hover, .btn-dark:focus-visible { color: var(--c-accent); }

/* ---------- Section base ---------- */
.section { padding: clamp(88px, 14vw, 180px) var(--gutter); position: relative; }
.section-inner { max-width: var(--max); margin: 0 auto; position: relative; z-index: 1; }
.section-label {
  font-family: var(--font-display); font-size: 0.85rem; letter-spacing: 0.18em;
  color: var(--c-accent); margin-bottom: 28px;
  display: flex; align-items: center; gap: 14px;
}
.section-label::after { content: ""; flex: 0 0 56px; height: 1px; background: var(--c-accent); }
.section-title { font-size: clamp(1.9rem, 5vw, 3.4rem); line-height: 1.35; font-weight: 700; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh; overflow: hidden;
  display: flex; align-items: flex-end;
  padding: calc(var(--header-h) + 32px) var(--gutter) clamp(36px, 6vw, 72px);
}
.hero-inner { position: relative; z-index: 1; width: 100%; max-width: 1400px; margin: 0 auto; }
.hero-title { margin: 0 0 clamp(28px, 5vw, 64px); line-height: 0.88; font-family: var(--font-display); font-weight: 700; }
.hero-word { display: block; font-size: clamp(3.6rem, 22vw, 15rem); letter-spacing: -0.04em; }
.hero-word-solid { color: var(--c-main); }
.hero-word-outline {
  color: transparent; -webkit-text-stroke: 2px var(--c-accent);
  padding-left: clamp(24px, 8vw, 140px); /* 非対称にずらす */
}
.hero-bottom { display: grid; gap: 28px; }
.hero-catch { font-size: clamp(1.5rem, 3.6vw, 2.4rem); font-weight: 700; line-height: 1.4; }
.hero-side { display: grid; gap: 24px; justify-items: start; max-width: 460px; }
.hero-lead { color: var(--c-muted); }
@media (min-width: 860px) {
  .hero-bottom { grid-template-columns: 1fr minmax(0, 460px); align-items: end; gap: 64px; }
}

/* Hero decoration（装飾。削除しても内容は伝わります） */
.hero-deco { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.deco-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 70%);
}
.deco-ring {
  position: absolute; border-radius: 50%; border: 1px solid var(--c-accent);
  top: 6%; right: -12%;
}
.deco-ring-1 { width: min(70vw, 640px); aspect-ratio: 1; opacity: 0.55; animation: drift 24s ease-in-out infinite alternate; }
.deco-ring-2 { width: min(46vw, 420px); aspect-ratio: 1; top: 14%; right: -2%; opacity: 0.3; border-style: dashed; animation: spin 60s linear infinite; }
.deco-slash {
  position: absolute; top: 0; left: 38%; width: 2px; height: 140%;
  background: linear-gradient(to bottom, transparent, var(--c-accent), transparent);
  transform: rotate(24deg); transform-origin: top; opacity: 0.5;
}
.deco-dot { position: absolute; top: 22%; right: 18%; width: 14px; height: 14px; background: var(--c-accent); border-radius: 50%; animation: pulse 3.6s ease-in-out infinite; }

@keyframes drift { from { transform: translate(0,0); } to { transform: translate(-24px, 28px); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.8); opacity: 0.4; } }

/* ---------- Concept ---------- */
.concept { background: var(--c-bg); border-top: 1px solid var(--c-line); }
.concept-text { font-size: clamp(2rem, 7vw, 5.2rem); line-height: 1.3; font-weight: 700; letter-spacing: -0.01em; }
.concept-muted { color: var(--c-muted); }
.concept-sub { max-width: 560px; margin: clamp(32px, 5vw, 56px) 0 0 auto; color: var(--c-muted); }

/* ---------- Services ---------- */
.services { background: var(--c-bg-sub); counter-reset: svc; }
.service-list { margin-top: clamp(40px, 6vw, 72px); border-top: 1px solid var(--c-line); }
.service-item { counter-increment: svc; border-bottom: 1px solid var(--c-line); }
.service-link {
  display: grid; gap: 12px; padding: 28px 0; text-decoration: none;
  grid-template-columns: auto 1fr;
  align-items: center;
  position: relative; transition: padding .3s, background .3s;
}
.service-link::before {
  content: counter(svc, decimal-leading-zero);
  grid-row: 1 / span 2;
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.6rem, 9vw, 5rem); line-height: 1;
  color: transparent; -webkit-text-stroke: 1px var(--c-muted);
  padding-right: clamp(16px, 4vw, 48px);
  transition: -webkit-text-stroke-color .3s;
}
.service-name { display: grid; }
.service-en { font-family: var(--font-display); font-size: clamp(1.4rem, 4vw, 2.4rem); font-weight: 700; line-height: 1.2; }
.service-ja { color: var(--c-accent); font-size: 0.9rem; }
.service-desc { color: var(--c-muted); grid-column: 2; }
.service-arrow { display: none; }
.service-link:hover::before, .service-link:focus-visible::before { -webkit-text-stroke-color: var(--c-accent); }
.service-link:hover .service-en { color: var(--c-accent); }

@media (min-width: 860px) {
  .service-link { grid-template-columns: 160px minmax(0, 1.1fr) minmax(0, 1fr) 48px; gap: 24px; padding: 36px 0; }
  .service-link::before { grid-row: auto; padding-right: 0; }
  .service-desc { grid-column: auto; }
  .service-arrow { display: block; width: 28px; height: 28px; border-top: 2px solid var(--c-accent); border-right: 2px solid var(--c-accent); transform: rotate(45deg); transition: transform .3s; justify-self: end; }
  .service-link:hover { padding-left: 16px; }
  .service-link:hover .service-arrow { transform: translate(6px, -6px) rotate(45deg); }
}

/* ---------- Approach ---------- */
.approach { background: var(--c-bg); }
.approach-grid { display: grid; gap: clamp(40px, 7vw, 80px); }
.approach-head .section-title { font-size: clamp(1.8rem, 3.6vw, 2.8rem); }
.approach-note { margin-top: 24px; color: var(--c-muted); max-width: 420px; }
.step-list { counter-reset: step; border-left: 2px solid var(--c-accent); }
.step { counter-increment: step; position: relative; padding: 0 0 clamp(28px, 4vw, 44px) clamp(24px, 4vw, 44px); }
.step:last-child { padding-bottom: 0; }
.step::before {
  content: ""; position: absolute; left: -7px; top: 0.6em;
  width: 12px; height: 12px; background: var(--c-accent); transform: rotate(45deg);
}
.step-title { font-size: clamp(1.3rem, 3vw, 1.8rem); font-weight: 700; display: flex; align-items: baseline; gap: 14px; }
.step-title::before { content: "0" counter(step); font-family: var(--font-display); font-size: 0.9rem; color: var(--c-accent); letter-spacing: 0.1em; }
.step-desc { color: var(--c-muted); margin-top: 6px; max-width: 520px; }
@media (min-width: 860px) {
  .approach-grid { grid-template-columns: 5fr 7fr; align-items: start; }
  .approach-head { position: sticky; top: calc(var(--header-h) + 32px); }
}

/* ---------- Contact ---------- */
.contact { background: var(--c-accent); color: var(--c-on-accent); overflow: hidden; }
.contact .section-label { color: var(--c-on-accent); }
.contact .section-label::after { background: var(--c-on-accent); }
.contact-deco {
  position: absolute; right: -10%; top: -30%; width: min(80vw, 720px); aspect-ratio: 1;
  border-radius: 50%; border: 2px solid rgba(16,24,32,0.22);
}
.contact-title { font-size: clamp(2.2rem, 8vw, 6rem); line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
.contact-sub { margin-top: 28px; max-width: 480px; font-weight: 500; }
.contact-actions { margin-top: 40px; display: flex; flex-wrap: wrap; align-items: center; gap: 24px 32px; }
.text-link { font-weight: 700; text-underline-offset: 6px; overflow-wrap: anywhere; }
.contact :focus-visible { outline-color: var(--c-on-accent); }

/* ---------- Footer ---------- */
.site-footer { background: var(--c-bg); padding: 56px var(--gutter) 40px; }
.footer-inner { max-width: var(--max); margin: 0 auto; display: grid; gap: 20px; }
.footer-brand { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.1em; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.footer-links a { color: var(--c-muted); font-size: 0.875rem; text-underline-offset: 4px; }
.footer-links a:hover { color: var(--c-accent); }
.footer-note, .footer-copy { color: var(--c-muted); font-size: 0.8rem; line-height: 1.7; }

/* ---------- Reveal animation ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Mobile tuning ---------- */
@media (max-width: 420px) {
  .hero-word-outline { -webkit-text-stroke-width: 1.5px; }
  .btn { width: 100%; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}