/* =============================================================
   株式会社NAGI コーポレートサイト スタイルシート
   トーン: 最先端 × 現場主義
   配色: 白ベース + ダークネイビー + ティール(点群の色)
   ============================================================= */

:root {
  --white: #ffffff;
  --paper: #f4f7f9;          /* うすい面の背景 */
  --navy-950: #081421;       /* ヒーロー・フッターの深紺 */
  --navy-900: #0c1d2e;
  --navy-700: #17324b;
  --ink: #1c2f41;            /* 本文の文字色 */
  --muted: #5d7284;          /* 補足の文字色 */
  --line: #d9e2e9;           /* 罫線 */
  --teal: #11b3a3;           /* アクセント(点群ティール) */
  --teal-soft: rgba(17, 179, 163, 0.14);
  --focus: #0d8f83;

  --font: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --maxw: 1120px;
  --pad: clamp(20px, 4vw, 48px);
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font);
  font-weight: 400;
  color: var(--ink);
  background: var(--white);
  line-height: 1.95;
  font-feature-settings: "palt";
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

img, video, canvas { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }
p a, .text-link { color: var(--navy-700); border-bottom: 1px solid var(--teal); padding-bottom: 1px; }
p a:hover, .text-link:hover { color: var(--teal); }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding-left: var(--pad); padding-right: var(--pad); }

/* ---------------- ヘッダー ---------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; max-width: none; padding-left: clamp(20px, 3vw, 36px); padding-right: clamp(20px, 3vw, 36px);
}
.brand { display: flex; align-items: baseline; gap: 10px; color: #fff; }
.brand strong { font-size: 1.3rem; font-weight: 500; letter-spacing: 0.14em; }
.brand span { font-size: 0.7rem; color: rgba(255,255,255,0.65); letter-spacing: 0.08em; }

.site-nav { display: flex; align-items: center; gap: clamp(14px, 2vw, 26px); }
.site-nav a { color: rgba(255,255,255,0.88); font-size: 0.86rem; letter-spacing: 0.05em; }
.site-nav a:hover { color: var(--teal); }
.site-nav .nav-cta {
  background: var(--teal); color: var(--navy-950); font-weight: 500;
  padding: 9px 20px; border-radius: 3px;
}
.site-nav .nav-cta:hover { background: #0ec9b6; color: var(--navy-950); }

.site-header.scrolled,
.site-header.solid {
  background: rgba(8, 20, 33, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.08);
}

.nav-toggle { display: none; }

@media (max-width: 860px) {
  .nav-toggle {
    display: block; background: none; border: 0; cursor: pointer;
    width: 44px; height: 44px; position: relative; z-index: 110;
  }
  .nav-toggle i, .nav-toggle i::before, .nav-toggle i::after {
    content: ""; display: block; position: absolute; left: 10px; right: 10px;
    height: 2px; background: #fff; transition: transform 0.25s ease, opacity 0.25s ease;
  }
  .nav-toggle i { top: 21px; }
  .nav-toggle i::before { top: -8px; }
  .nav-toggle i::after { top: 8px; }
  .nav-open .nav-toggle i { transform: rotate(45deg); }
  .nav-open .nav-toggle i::before { transform: rotate(-90deg) translateX(-8px); }
  .nav-open .nav-toggle i::after { opacity: 0; }

  .site-nav {
    position: fixed; inset: 0; background: var(--navy-950);
    flex-direction: column; justify-content: center; gap: 30px;
    opacity: 0; pointer-events: none; transition: opacity 0.25s ease;
  }
  .nav-open .site-nav { opacity: 1; pointer-events: auto; }
  .site-nav a { font-size: 1.05rem; }
}

/* ---------------- ヒーロー ---------------- */
.hero {
  position: relative; min-height: 100svh;
  background: var(--navy-950); color: #fff;
  display: flex; align-items: flex-end; overflow: hidden;
}
.hero-visual { position: absolute; inset: 0; }
.hero-visual canvas, .hero-visual video { width: 100%; height: 100%; object-fit: cover; }
.hero-visual .hero-static {
  position: absolute; inset: 0;
  background:
    radial-gradient(1100px 480px at 85% 18%, rgba(17,179,163,0.22), transparent 62%),
    radial-gradient(900px 560px at 8% 92%, rgba(23,50,75,0.9), transparent 70%),
    var(--navy-950);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to top, rgba(8,20,33,0.82) 0%, rgba(8,20,33,0.18) 36%, transparent 60%);
}

.hero-inner {
  position: relative; z-index: 2; width: 100%;
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 var(--pad) clamp(56px, 10vh, 110px);
}
.hero-copy {
  font-size: clamp(2rem, 5.4vw, 3.7rem);
  font-weight: 300; line-height: 1.5; letter-spacing: 0.06em;
  opacity: 0; transform: translateY(14px);
  animation: hero-in 1s ease 0.25s forwards;
}
.hero-sub {
  margin-top: 18px; font-size: clamp(0.9rem, 1.6vw, 1.05rem);
  color: rgba(255,255,255,0.82); font-weight: 300; letter-spacing: 0.06em;
  opacity: 0; animation: hero-in 1s ease 0.55s forwards;
}
.hero-actions { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap;
  opacity: 0; animation: hero-in 1s ease 0.8s forwards; }
@keyframes hero-in { to { opacity: 1; transform: none; } }

.btn {
  display: inline-block; padding: 14px 32px; border-radius: 3px;
  font-size: 0.95rem; letter-spacing: 0.08em; font-weight: 500;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-primary { background: var(--teal); color: var(--navy-950); }
.btn-primary:hover { background: #0ec9b6; }
.btn-ghost { border: 1px solid rgba(255,255,255,0.55); color: #fff; }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); }

.hero-note {
  position: absolute; right: clamp(16px, 3vw, 32px); bottom: 18px; z-index: 2;
  font-size: 0.7rem; color: rgba(255,255,255,0.45); letter-spacing: 0.06em;
}

/* ---------------- セクション共通 ---------------- */
.section { padding: clamp(72px, 11vw, 128px) 0; }
.section.on-paper { background: var(--paper); }

.sec-head { margin-bottom: clamp(36px, 5vw, 56px); }
.sec-title {
  display: flex; align-items: center; gap: 14px;
  font-size: clamp(1.45rem, 2.6vw, 1.95rem); font-weight: 400; letter-spacing: 0.08em;
}
/* 測量の基準点を模した「+」マーカー */
.mark { position: relative; width: 15px; height: 15px; flex: none; }
.mark::before, .mark::after { content: ""; position: absolute; background: var(--teal); }
.mark::before { left: 0; right: 0; top: 7px; height: 1.5px; }
.mark::after { top: 0; bottom: 0; left: 7px; width: 1.5px; }

.sec-lede { margin-top: 16px; color: var(--muted); font-size: 0.95rem; max-width: 42em; }

/* ---------------- 実績数字帯 ---------------- */
.stats { background: var(--navy-950); color: #fff; padding: clamp(52px, 7vw, 84px) 0; }
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: clamp(28px, 4vw, 48px);
}
.stat .num {
  font-size: clamp(2.6rem, 5vw, 3.8rem); font-weight: 200; line-height: 1.1;
  letter-spacing: 0.02em; font-feature-settings: "tnum";
}
.stat .num small { font-size: 0.42em; font-weight: 300; margin-left: 4px; color: var(--teal); }
.stat .label { margin-top: 10px; font-size: 0.82rem; color: rgba(255,255,255,0.72); letter-spacing: 0.05em; }

/* ---------------- 事業(非対称レイアウト) ---------------- */
.svc-main {
  display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  border: 1px solid var(--line); border-radius: 4px; overflow: hidden;
  background: var(--white);
}
.svc-main-visual {
  background:
    radial-gradient(circle at 20% 30%, rgba(17,179,163,0.35) 0 1.5px, transparent 2px),
    radial-gradient(circle at 70% 60%, rgba(17,179,163,0.3) 0 1.5px, transparent 2px),
    radial-gradient(circle at 45% 80%, rgba(255,255,255,0.25) 0 1px, transparent 1.6px),
    radial-gradient(circle at 85% 20%, rgba(255,255,255,0.2) 0 1px, transparent 1.6px),
    radial-gradient(900px 400px at 80% 10%, rgba(17,179,163,0.18), transparent 60%),
    var(--navy-900);
  background-size: 90px 90px, 120px 120px, 70px 70px, 110px 110px, auto, auto;
  min-height: 300px;
  position: relative;
}
.svc-main-visual::after {
  content: "Lixel K2 / 3D Gaussian Splatting";
  position: absolute; left: 20px; bottom: 16px;
  font-size: 0.68rem; letter-spacing: 0.12em; color: rgba(255,255,255,0.5);
}
.svc-main-body { padding: clamp(28px, 4vw, 52px); }
.svc-tag { font-size: 0.76rem; color: var(--teal); letter-spacing: 0.1em; font-weight: 500; }
.svc-main-body h3 { font-size: clamp(1.3rem, 2.2vw, 1.7rem); font-weight: 500; margin: 10px 0 16px; letter-spacing: 0.06em; }
.svc-main-body p { color: var(--ink); font-size: 0.95rem; }
.svc-more { display: inline-block; margin-top: 22px; font-size: 0.88rem; color: var(--navy-700);
  border-bottom: 1px solid var(--teal); padding-bottom: 2px; }
.svc-more:hover { color: var(--teal); }

.svc-sub { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 24px; }
.svc-card {
  border: 1px solid var(--line); border-radius: 4px; background: var(--white);
  padding: clamp(24px, 3vw, 40px);
}
.svc-card h3 { font-size: 1.15rem; font-weight: 500; margin: 10px 0 12px; letter-spacing: 0.05em; }
.svc-card p { font-size: 0.92rem; color: var(--ink); }

@media (max-width: 860px) {
  .svc-main { grid-template-columns: 1fr; }
  .svc-main-visual { min-height: 200px; }
  .svc-sub { grid-template-columns: 1fr; }
}

/* ---------------- 3Dスキャン詳細 ---------------- */
.viewer-box {
  position: relative; border-radius: 4px; overflow: hidden;
  background: var(--navy-950); min-height: clamp(300px, 48vw, 520px);
}
.viewer-box canvas, .viewer-box video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.viewer-caption {
  position: absolute; left: 18px; bottom: 14px; z-index: 2;
  font-size: 0.72rem; color: rgba(255,255,255,0.55); letter-spacing: 0.08em;
}
.scene-list { margin-top: clamp(36px, 5vw, 52px); border-top: 1px solid var(--line); }
.scene-item {
  display: grid; grid-template-columns: 200px 1fr; gap: 18px;
  padding: 26px 4px; border-bottom: 1px solid var(--line);
}
.scene-item h4 { font-size: 1rem; font-weight: 500; letter-spacing: 0.05em; }
.scene-item p { font-size: 0.92rem; color: var(--muted); }
@media (max-width: 700px) { .scene-item { grid-template-columns: 1fr; gap: 6px; } }

/* ---------------- 導入事例 ---------------- */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.case-card {
  border: 1px solid var(--line); border-radius: 4px; background: var(--white);
  padding: 28px; display: flex; flex-direction: column; gap: 12px;
}
.case-meta { display: flex; gap: 10px; align-items: center; font-size: 0.74rem; }
.case-meta .tag { color: var(--teal); font-weight: 500; letter-spacing: 0.08em; }
.case-meta .ind { color: var(--muted); }
.case-card h3 { font-size: 1.02rem; font-weight: 500; line-height: 1.7; letter-spacing: 0.04em; }
.case-card p { font-size: 0.88rem; color: var(--muted); }
.cases-note { margin-top: 20px; font-size: 0.78rem; color: var(--muted); }

/* ---------------- tsutae book ---------------- */
.tsutae { background: var(--navy-950); color: #fff; }
.tsutae .sec-title { color: #fff; }
.tsutae-lead {
  font-size: clamp(1.3rem, 2.6vw, 1.9rem); font-weight: 300; line-height: 1.9;
  letter-spacing: 0.08em; max-width: 30em;
}
.tsutae-body { margin-top: 28px; max-width: 40em; color: rgba(255,255,255,0.82); font-size: 0.95rem; }
.tsutae .btn { margin-top: 34px; }

/* ---------------- お問い合わせ ---------------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(36px, 6vw, 80px); }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-copy p { color: var(--muted); font-size: 0.95rem; }

.form-row { margin-bottom: 26px; }
.form-row label { display: block; font-size: 0.82rem; letter-spacing: 0.06em; margin-bottom: 8px; color: var(--navy-700); }
.form-row label .req { color: var(--teal); margin-left: 6px; font-size: 0.72rem; }
.form-row input, .form-row textarea {
  width: 100%; border: 0; border-bottom: 1px solid var(--line); background: transparent;
  font: inherit; padding: 8px 2px 10px; color: var(--ink);
  transition: border-color 0.2s ease;
}
.form-row input:focus, .form-row textarea:focus { outline: none; border-bottom-color: var(--teal); }
.form-row textarea { min-height: 140px; resize: vertical; }
.form-msg { margin-top: 14px; font-size: 0.85rem; color: var(--navy-700); min-height: 1.6em; }
.form-msg.ok { color: var(--teal); }
.form-msg.ng { color: #c0564a; }
button.btn { border: 0; cursor: pointer; font-family: inherit; }
.btn-navy { background: var(--navy-900); color: #fff; }
.btn-navy:hover { background: var(--navy-700); }

/* ---------------- 下層ページ共通 ---------------- */
.page-head {
  background: var(--navy-950); color: #fff;
  padding: calc(72px + clamp(48px, 8vw, 90px)) 0 clamp(44px, 6vw, 70px);
}
.page-head h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 300; letter-spacing: 0.1em; }
.page-head .sub { margin-top: 10px; color: rgba(255,255,255,0.7); font-size: 0.88rem; letter-spacing: 0.06em; }

.prose { max-width: 44em; }
.prose h2 { font-size: 1.3rem; font-weight: 500; margin: 2.2em 0 0.8em; letter-spacing: 0.06em;
  display: flex; align-items: center; gap: 12px; }
.prose h2:first-child { margin-top: 0; }
.prose p + p { margin-top: 1.2em; }
.prose ul { margin: 1em 0 1em 1.4em; }
.prose li { margin: 0.4em 0; }

.dl-table { width: 100%; border-top: 1px solid var(--line); }
.dl-table div { display: grid; grid-template-columns: 180px 1fr; border-bottom: 1px solid var(--line); }
.dl-table dt { padding: 20px 8px; font-size: 0.88rem; color: var(--muted); letter-spacing: 0.05em; }
.dl-table dd { padding: 20px 8px; font-size: 0.95rem; }
@media (max-width: 640px) {
  .dl-table div { grid-template-columns: 1fr; }
  .dl-table dt { padding-bottom: 0; }
  .dl-table dd { padding-top: 6px; }
}

/* ---------------- フッター ---------------- */
.site-footer { background: var(--navy-950); color: rgba(255,255,255,0.78); padding: 60px 0 36px; }
.footer-top { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; align-items: flex-start; }
.footer-brand strong { color: #fff; font-size: 1.1rem; font-weight: 500; letter-spacing: 0.14em; }
.footer-brand p { margin-top: 8px; font-size: 0.78rem; color: rgba(255,255,255,0.55); }
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a { font-size: 0.82rem; color: rgba(255,255,255,0.72); }
.footer-nav a:hover { color: var(--teal); }
.footer-bottom { margin-top: 44px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.72rem; color: rgba(255,255,255,0.45); letter-spacing: 0.05em; }