/* ============================================================
   AIUTOPIA — ポータルサイト デザインシステム
   外部フォント・外部CDN禁止。すべて自己完結。
   ============================================================ */

:root {
  --bg: #04060d;
  --bg-elev: #0a0e1a;
  --panel: rgba(148, 163, 204, 0.055);
  --panel-solid: #0b101d;
  --text: #eaeefb;
  --sub: #9aa5c0;
  --dim: #5d6884;
  --line: rgba(148, 163, 204, 0.16);
  --line-soft: rgba(148, 163, 204, 0.09);

  --cyan: #4cc9ff;
  --violet: #7b5cff;
  --magenta: #ff4ecd;
  --green: #3ddc97;
  --amber: #ffb54c;

  --grad: linear-gradient(100deg, var(--cyan), var(--violet) 52%, var(--magenta));

  --font: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
          "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;

  --radius: 18px;
  --header-h: 60px;
  --maxw: 1080px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(123, 92, 255, 0.45); }

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

/* ---------- 背景キャンバス(星空・固定) ---------- */

#cosmos {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  display: block;
}

/* ---------- ヘッダー ---------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 40px);
  z-index: 50;
  transition: background 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(5, 8, 16, 0.72);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line-soft);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark { width: 26px; height: 26px; flex: none; }

.brand-name {
  font-weight: 800;
  letter-spacing: 0.22em;
  font-size: 0.95rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.site-nav {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
}

.site-nav a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--sub);
  transition: color 0.2s ease;
}

.site-nav a:hover { color: var(--text); }

/* ---------- ヒーロー ---------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

#city {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hero-inner {
  position: relative;
  padding: 96px 20px 140px;
  max-width: 860px;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--cyan);
  margin-bottom: 18px;
  animation: heroIn 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.hero-logo {
  font-size: clamp(3rem, 11.5vw, 7.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.1em;
  text-indent: 0.1em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 34px rgba(123, 92, 255, 0.38));
  animation: heroIn 0.9s 0.08s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.hero-tagline {
  margin-top: 20px;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  animation: heroIn 0.9s 0.18s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.hero-sub {
  margin-top: 16px;
  color: var(--sub);
  font-size: 0.95rem;
  animation: heroIn 0.9s 0.28s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.hero-cta {
  margin-top: 36px;
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  animation: heroIn 0.9s 0.38s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

@keyframes heroIn {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- ボタン ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 6px 28px rgba(123, 92, 255, 0.42);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 36px rgba(123, 92, 255, 0.6);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--sub);
  background: rgba(10, 14, 26, 0.4);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(148, 163, 204, 0.4);
  transform: translateY(-2px);
}

/* ---------- スクロールヒント ---------- */

.scroll-hint {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.scroll-hint-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  color: var(--dim);
}

.scroll-hint-bar {
  width: 1px;
  height: 46px;
  background: linear-gradient(var(--cyan), transparent);
  overflow: hidden;
  position: relative;
}

.scroll-hint-bar::after {
  content: "";
  position: absolute;
  left: 0; top: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(transparent, #fff);
  animation: scrollDrop 2.2s ease-in-out infinite;
}

@keyframes scrollDrop {
  0%   { top: -100%; }
  60%  { top: 100%; }
  100% { top: 100%; }
}

/* ---------- セクション共通 ---------- */

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(80px, 12vh, 130px) clamp(20px, 4vw, 40px);
}

.section-head { margin-bottom: 52px; }

.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.4;
}

.section-lede {
  margin-top: 14px;
  color: var(--sub);
  font-size: 0.95rem;
  max-width: 46em;
}

/* ---------- サービスカード ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 22px;
}

.service-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  overflow: hidden;
  /* グラデーション枠線(padding-box / border-box 二重背景) */
  border: 1px solid transparent;
  background:
    linear-gradient(var(--panel-solid), var(--panel-solid)) padding-box,
    linear-gradient(160deg, rgba(76, 201, 255, 0.28), rgba(148, 163, 204, 0.1) 40%, rgba(255, 78, 205, 0.24)) border-box;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.3s ease, background 0.3s ease;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 50px rgba(3, 6, 16, 0.7), 0 0 0 1px rgba(123, 92, 255, 0.14);
  background:
    linear-gradient(#0d1322, #0d1322) padding-box,
    linear-gradient(160deg, rgba(76, 201, 255, 0.75), rgba(123, 92, 255, 0.45) 45%, rgba(255, 78, 205, 0.7)) border-box;
}

.service-card.is-soon { cursor: default; }

.service-card.is-soon:hover { transform: translateY(-3px); }

.card-viz {
  height: 190px;
  background: #070b14;
  border-bottom: 1px solid var(--line-soft);
  position: relative;
}

.card-viz canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.card-body {
  padding: 24px 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.card-tags { display: flex; gap: 8px; flex-wrap: wrap; }

.tag {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
}

.tag-live {
  color: var(--green);
  border-color: rgba(61, 220, 151, 0.4);
  text-shadow: 0 0 12px rgba(61, 220, 151, 0.7);
}

.tag-soon {
  color: var(--amber);
  border-color: rgba(255, 181, 76, 0.35);
}

.card-body h3 {
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.card-kana {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--dim);
  margin-left: 8px;
  letter-spacing: 0.2em;
}

.card-body p {
  color: var(--sub);
  font-size: 0.88rem;
  flex: 1;
}

.card-link {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.card-link.is-muted { color: var(--dim); }

.card-arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.service-card:hover .card-arrow { transform: translateX(5px); }

/* ---------- About ---------- */

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.pillar {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 30px 28px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.pillar:hover {
  border-color: rgba(123, 92, 255, 0.4);
  transform: translateY(-4px);
}

.pillar-num {
  font-family: var(--mono);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.55;
  margin-bottom: 18px;
}

.pillar h3 {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.pillar-en {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

.pillar p {
  color: var(--sub);
  font-size: 0.86rem;
}

/* ---------- フッター ---------- */

.site-footer {
  border-top: 1px solid var(--line-soft);
  background: rgba(5, 8, 16, 0.6);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px clamp(20px, 4vw, 40px);
  display: flex;
  align-items: center;
  gap: 26px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-nav {
  display: flex;
  gap: 22px;
  flex: 1;
}

.footer-nav a {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--sub);
  transition: color 0.2s ease;
}

.footer-nav a:hover { color: var(--cyan); }

.footer-copy {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
  letter-spacing: 0.06em;
}

/* ---------- スクロール出現 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.7, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

.card-grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.card-grid .reveal:nth-child(3) { transition-delay: 0.2s; }
.pillar-grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.pillar-grid .reveal:nth-child(3) { transition-delay: 0.2s; }

/* ---------- 404 ---------- */

.notfound {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  gap: 18px;
}

.notfound h1 {
  font-family: var(--mono);
  font-size: clamp(4rem, 16vw, 8rem);
  font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 30px rgba(123, 92, 255, 0.35));
}

.notfound p { color: var(--sub); }

/* ---------- レスポンシブ / モーション設定 ---------- */

@media (max-width: 640px) {
  .pc { display: none; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 18px; }
  .footer-nav { flex: none; }
}

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