/* KURAVO corporate site — dark minimal + typography */
:root {
  --bg: #08080d;
  --bg-soft: #0e0e16;
  --text: #e8e8f0;
  --text-dim: #9a9aad;
  --line: rgba(255, 255, 255, 0.08);
  --accent-a: #4f7cff;
  --accent-b: #a855f7;
  --accent-c: #22d3ee;
  --radius: 14px;
  --en: "Space Grotesk", "Noto Sans JP", sans-serif;
  --jp: "Noto Sans JP", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--jp);
  font-weight: 400;
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- background decorations ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
}
.bg-orb {
  position: fixed; z-index: -1; border-radius: 50%;
  filter: blur(110px); opacity: 0.32; pointer-events: none;
  will-change: transform;
}
.bg-orb--1 {
  width: 560px; height: 560px; top: -180px; right: -120px;
  background: radial-gradient(circle, var(--accent-a), transparent 65%);
  animation: drift1 22s ease-in-out infinite alternate;
}
.bg-orb--2 {
  width: 480px; height: 480px; bottom: -160px; left: -140px;
  background: radial-gradient(circle, var(--accent-b), transparent 65%);
  animation: drift2 26s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(-80px, 120px) scale(1.15); } }
@keyframes drift2 { to { transform: translate(100px, -90px) scale(1.1); } }

/* ---------- header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 56px);
  background: rgba(8, 8, 13, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--en); font-weight: 700; font-size: 1.25rem;
  letter-spacing: 0.06em; color: var(--text); text-decoration: none;
}
.brand-dot { color: var(--accent-c); }
.nav { display: flex; gap: clamp(18px, 3vw, 36px); align-items: center; }
.nav a {
  color: var(--text-dim); text-decoration: none; font-size: 0.92rem;
  font-family: var(--en); letter-spacing: 0.04em;
  transition: color 0.25s;
}
.nav a:hover { color: var(--text); }
.nav-cta {
  padding: 8px 20px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--text) !important;
  transition: border-color 0.25s, background 0.25s;
}
.nav-cta:hover { border-color: var(--accent-c); background: rgba(34, 211, 238, 0.08); }
.nav-toggle { display: none; }

/* ---------- hero ---------- */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px clamp(20px, 6vw, 72px) 80px;
  position: relative;
}
.hero-eyebrow {
  font-family: var(--en); letter-spacing: 0.28em; text-transform: uppercase;
  font-size: 0.82rem; color: var(--accent-c); margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.5rem, 8.2vw, 6.2rem);
  font-weight: 700; line-height: 1.16; letter-spacing: 0.01em;
}
.hero-title span { display: block; }
.grad-text {
  background: linear-gradient(92deg, var(--accent-a), var(--accent-b) 55%, var(--accent-c));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-sub {
  margin-top: 28px; color: var(--text-dim);
  font-size: clamp(1rem, 2vw, 1.2rem); font-weight: 300; letter-spacing: 0.06em;
}
.hero-actions { display: flex; gap: 16px; margin-top: 44px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 14px 34px; border-radius: 999px;
  font-size: 0.95rem; font-weight: 500; text-decoration: none;
  cursor: pointer; border: none; font-family: var(--jp);
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s, border-color 0.25s;
}
.btn-primary {
  background: linear-gradient(92deg, var(--accent-a), var(--accent-b));
  color: #fff;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(120, 90, 255, 0.35); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--accent-c); background: rgba(34, 211, 238, 0.07); }

.hero-marquee {
  position: absolute; bottom: 0; left: 0; right: 0;
  overflow: hidden; border-top: 1px solid var(--line);
  padding: 14px 0; opacity: 0.5;
}
.marquee-track {
  display: flex; white-space: nowrap; width: max-content;
  animation: marquee 30s linear infinite;
  font-family: var(--en); font-size: 0.8rem; letter-spacing: 0.3em;
  color: var(--text-dim);
}
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- sections ---------- */
.section {
  max-width: 1080px; margin: 0 auto;
  padding: clamp(80px, 12vh, 140px) clamp(20px, 5vw, 40px);
}
.section-eyebrow {
  font-family: var(--en); letter-spacing: 0.26em; text-transform: uppercase;
  font-size: 0.78rem; color: var(--accent-c); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 4.5vw, 2.8rem); font-weight: 700; letter-spacing: 0.02em;
}
.section-lead { color: var(--text-dim); margin-top: 16px; max-width: 560px; }

/* cards */
.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px; margin-top: 52px;
}
.card {
  position: relative;
  background: linear-gradient(160deg, rgba(255,255,255,0.045), rgba(255,255,255,0.015));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.3s, border-color 0.3s;
}
.card:hover { transform: translateY(-5px); border-color: rgba(120, 130, 255, 0.35); }
.card-num {
  font-family: var(--en); font-size: 0.8rem; letter-spacing: 0.2em;
  color: var(--accent-c); margin-bottom: 18px;
}
.card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.card p { color: var(--text-dim); font-size: 0.92rem; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tags li {
  font-size: 0.75rem; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px;
}

/* company table */
.company-table { margin-top: 48px; border-top: 1px solid var(--line); }
.company-table > div {
  display: grid; grid-template-columns: 180px 1fr;
  padding: 22px 8px; border-bottom: 1px solid var(--line); gap: 12px;
}
.company-table dt { color: var(--text-dim); font-size: 0.9rem; letter-spacing: 0.06em; }
.company-table dd { font-size: 0.98rem; }

/* contact form */
.contact-form { margin-top: 48px; display: grid; gap: 24px; max-width: 640px; }
.contact-form label { display: grid; gap: 9px; }
.contact-form label span { font-size: 0.88rem; color: var(--text-dim); letter-spacing: 0.04em; }
.contact-form em { color: var(--accent-c); font-style: normal; }
.contact-form input,
.contact-form textarea {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px;
  color: var(--text); padding: 14px 16px; font-size: 1rem; font-family: var(--jp);
  transition: border-color 0.25s; resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus { outline: none; border-color: var(--accent-a); }
.contact-form .btn { justify-self: start; }
.contact-form .btn[disabled] { opacity: 0.55; cursor: wait; transform: none; }
.hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-status { font-size: 0.9rem; min-height: 1.5em; }
.form-status.ok { color: #4ade80; }
.form-status.ng { color: #f87171; }
.form-status a { color: var(--accent-c); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 56px clamp(20px, 5vw, 56px) 32px; }
.footer-inner {
  display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap;
  max-width: 1080px; margin: 0 auto;
}
.footer-note { color: var(--text-dim); font-size: 0.88rem; margin-top: 10px; }
.footer-nav { display: grid; gap: 10px; }
.footer-nav a { color: var(--text-dim); text-decoration: none; font-size: 0.88rem; transition: color 0.25s; }
.footer-nav a:hover { color: var(--text); }
.copyright {
  text-align: center; color: var(--text-dim); font-size: 0.78rem;
  margin-top: 48px; letter-spacing: 0.04em;
}

/* ---------- privacy page ---------- */
.doc { max-width: 760px; margin: 0 auto; padding: 140px clamp(20px, 5vw, 40px) 80px; }
.doc h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: 8px; }
.doc .doc-date { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 40px; }
.doc h2 { font-size: 1.15rem; margin: 40px 0 12px; }
.doc p, .doc li { color: var(--text-dim); font-size: 0.95rem; }
.doc ul { padding-left: 1.4em; }
.doc a { color: var(--accent-c); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.d1 { transition-delay: 0.1s; }
.reveal.d2 { transition-delay: 0.2s; }
.reveal.d3 { transition-delay: 0.3s; }
.reveal.d4 { transition-delay: 0.42s; }
.reveal.on { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .bg-orb, .marquee-track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- mobile ---------- */
@media (max-width: 720px) {
  .nav {
    position: fixed; top: 62px; right: 0; left: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(10, 10, 16, 0.97);
    border-bottom: 1px solid var(--line);
    display: none; padding: 8px 0 16px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 14px 28px; font-size: 1rem; }
  .nav-cta { border: none; margin: 0; }
  .nav-toggle {
    display: grid; gap: 6px; background: none; border: none; cursor: pointer; padding: 8px;
  }
  .nav-toggle span { width: 24px; height: 2px; background: var(--text); transition: transform 0.3s, opacity 0.3s; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }
  .company-table > div { grid-template-columns: 1fr; gap: 4px; }
  .company-table dt { font-size: 0.8rem; }
}