:root{
    --bg:#0a0e14;            /* ほぼ黒に近い濃紺 */
    --bg-2:#11161e;
    --ink:#e6e8ec;
    --ink-2:#a0a5b0;
    --mute:#5e6470;
    --line:rgba(255,255,255,.08);
    --line-2:rgba(255,255,255,.04);
    --accent:#00f08a;        /* ビビッドグリーン */
    --accent-dim:#008a4a;
    --cyan:#00d4ff;
    --magenta:#ff3ea0;
    --paper:#11161e;
    --warn:#ff5b3a;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html,body{background:var(--bg);color:var(--ink);font-family:"Zen Kaku Gothic New",sans-serif;-webkit-font-smoothing:antialiased;}
  body{overflow-x:hidden;}
  a{color:inherit;text-decoration:none;}
  .mono{font-family:"JetBrains Mono",monospace;letter-spacing:.02em;}
  .min{font-family:"Shippori Mincho",serif;}
  .crt{font-family:"VT323",monospace;}

  /* 背景：スキャンライン＋星空 */
  .stars{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.6;
    background-image:
      radial-gradient(1px 1px at 20% 30%, #fff, transparent),
      radial-gradient(1px 1px at 70% 60%, #fff, transparent),
      radial-gradient(1px 1px at 40% 80%, #fff, transparent),
      radial-gradient(2px 2px at 90% 20%, #fff, transparent),
      radial-gradient(1px 1px at 15% 70%, #00d4ff, transparent),
      radial-gradient(1px 1px at 85% 85%, #fff, transparent),
      radial-gradient(1px 1px at 50% 15%, #00f08a, transparent),
      radial-gradient(1px 1px at 30% 50%, #fff, transparent);
    background-size: 800px 800px;
    animation: drift 120s linear infinite;}
  @keyframes drift{0%{background-position:0 0;} 100%{background-position:-800px -800px;}}
  .scan{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.05;
    background-image:linear-gradient(transparent 50%,#000 50%);background-size:100% 4px;}
  .grid-bg{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.18;
    background-image:linear-gradient(to right,rgba(0,240,138,.15) 1px,transparent 1px),linear-gradient(to bottom,rgba(0,240,138,.15) 1px,transparent 1px);
    background-size:80px 80px;}

  /* ── ヘッダー ── */
  header{position:fixed;top:0;left:0;right:0;z-index:50;
    display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
    padding:18px 36px;
    backdrop-filter:saturate(1.2) blur(12px);
    background:rgba(10,14,20,.7);
    border-bottom:1px solid var(--line);}
  .logo{display:flex;align-items:center;color:var(--ink);}
  .logo svg{height:28px;width:auto;display:block;}
  nav{display:flex;gap:28px;justify-content:center;}
  nav a{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-2);position:relative;padding:6px 0;}
  nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--accent);transition:right .3s;}
  nav a:hover::after,nav a.current::after{right:0;}
  .meta-right{justify-self:end;display:flex;align-items:center;gap:14px;font-size:11px;color:var(--mute);}
  .meta-right .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);animation:pulse 2s infinite;}
  @keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

  /* ── HERO ── */
  .hero{position:relative;z-index:2;padding:140px 36px 80px;border-bottom:1px solid var(--line);min-height:100vh;display:flex;flex-direction:column;justify-content:center;}
  .breadcrumb{display:flex;align-items:center;gap:12px;font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--mute);margin-bottom:60px;letter-spacing:.15em;}
  .breadcrumb a:hover{color:var(--accent);}
  .breadcrumb .sep{color:var(--mute);opacity:.5;}
  .breadcrumb .current{color:var(--accent);}

  .hero-stack{display:grid;grid-template-columns:1fr auto;gap:60px;align-items:end;}
  .hero-main{position:relative;}
  .codename{display:inline-flex;align-items:center;gap:10px;font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.3em;color:var(--accent);border:1px solid var(--accent);padding:6px 14px;border-radius:100px;margin-bottom:36px;background:rgba(0,240,138,.05);}
  .codename .blink{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent);animation:pulse 1.5s infinite;}
  .hero-title{font-family:"Shippori Mincho",serif;font-weight:800;font-size:clamp(48px,8vw,112px);line-height:.95;letter-spacing:-.03em;color:var(--ink);}
  .hero-title .en{display:block;font-family:"VT323",monospace;font-size:.32em;color:var(--accent);letter-spacing:.1em;margin-top:18px;font-weight:400;}
  .hero-glitch{position:relative;display:inline-block;}
  .hero-glitch::before,.hero-glitch::after{content:attr(data-text);position:absolute;top:0;left:0;width:100%;height:100%;opacity:.7;}
  .hero-glitch::before{color:var(--cyan);transform:translate(-2px,0);mix-blend-mode:screen;animation:glitch1 4s infinite linear;}
  .hero-glitch::after{color:var(--magenta);transform:translate(2px,0);mix-blend-mode:screen;animation:glitch2 5s infinite linear;}
  @keyframes glitch1{0%,90%,100%{transform:translate(-2px,0);}92%{transform:translate(-5px,1px);}94%{transform:translate(2px,-1px);}96%{transform:translate(-2px,0);}}
  @keyframes glitch2{0%,93%,100%{transform:translate(2px,0);}95%{transform:translate(5px,-1px);}97%{transform:translate(-2px,1px);}}

  .hero-lead{font-family:"Shippori Mincho",serif;font-size:22px;line-height:1.9;color:var(--ink-2);max-width:680px;margin-top:50px;}
  .hero-lead em{font-style:normal;color:var(--accent);font-weight:500;}

  .hero-side{padding-left:36px;border-left:1px solid var(--line);width:260px;}
  .status-panel{display:flex;flex-direction:column;gap:20px;}
  .status-row{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--mute);letter-spacing:.15em;}
  .status-row .lbl{display:block;font-size:9px;color:var(--accent);margin-bottom:4px;}
  .status-row .val{color:var(--ink);font-size:13px;}
  .status-row.big .val{font-size:24px;font-family:"VT323",monospace;color:var(--accent);letter-spacing:.05em;}
  .progress-bar{position:relative;height:6px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:8px;}
  .progress-bar .fill{position:absolute;inset:0;width:35%;background:var(--accent);box-shadow:0 0 8px var(--accent);animation:progress-pulse 3s ease-in-out infinite;}
  @keyframes progress-pulse{0%,100%{opacity:1;}50%{opacity:.6;}}

  /* ── 共通セクション ── */
  section{position:relative;z-index:2;padding:120px 36px;}
  section + section{border-top:1px solid var(--line);}
  .sec-head{display:grid;grid-template-columns:80px 1fr auto;gap:36px;align-items:end;margin-bottom:60px;}
  .sec-num{writing-mode:vertical-rl;font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--accent);height:160px;letter-spacing:.2em;}
  .sec-title{font-family:"Shippori Mincho",serif;font-weight:800;font-size:clamp(36px,5vw,68px);line-height:1;letter-spacing:-.02em;color:var(--ink);}
  .sec-title .en{display:block;font-family:"VT323",monospace;font-size:16px;font-weight:400;letter-spacing:.15em;color:var(--accent);margin-bottom:16px;}
  .sec-meta{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--mute);letter-spacing:.2em;text-align:right;}

  /* ── CONCEPT ── */
  .concept-wrap{display:grid;grid-template-columns:1fr 1fr;gap:80px;}
  .concept-body{font-family:"Shippori Mincho",serif;font-size:22px;line-height:2;color:var(--ink);}
  .concept-body p{margin-bottom:32px;}
  .concept-body strong{color:var(--accent);font-weight:500;}
  .concept-quote{padding:30px 36px;border-left:3px solid var(--accent);background:rgba(0,240,138,.04);font-family:"Shippori Mincho",serif;font-size:18px;line-height:1.9;color:var(--ink-2);font-style:italic;margin-top:20px;}
  .concept-quote::before{content:"// LOG";display:block;font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--accent);letter-spacing:.25em;margin-bottom:14px;font-style:normal;}

  /* ── WORLD ── */
  .world-section{background:linear-gradient(180deg,var(--bg),var(--bg-2));}
  .world{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .world-card{background:var(--paper);border:1px solid var(--line);padding:36px 30px;position:relative;overflow:hidden;transition:border-color .3s;}
  .world-card:hover{border-color:var(--accent);}
  .world-card::before{content:"";position:absolute;top:0;left:0;width:30px;height:2px;background:var(--accent);}
  .world-card .label{font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--accent);letter-spacing:.25em;margin-bottom:16px;}
  .world-card h3{font-family:"Shippori Mincho",serif;font-size:24px;line-height:1.4;color:var(--ink);margin-bottom:18px;}
  .world-card p{font-size:13px;line-height:1.9;color:var(--ink-2);}

  /* ── GAMEPLAY ── */
  .gameplay{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);}
  .gp-step{padding:36px 28px;border-right:1px solid var(--line);position:relative;transition:background .3s;}
  .gp-step:last-child{border-right:none;}
  .gp-step:hover{background:rgba(0,240,138,.04);}
  .gp-step .num{font-family:"VT323",monospace;font-size:48px;color:var(--accent);line-height:1;margin-bottom:18px;}
  .gp-step h3{font-family:"Shippori Mincho",serif;font-size:20px;color:var(--ink);margin-bottom:14px;}
  .gp-step p{font-size:13px;line-height:1.8;color:var(--ink-2);}

  /* ── TERMINAL（コンソール風AIメッセージ） ── */
  .terminal-section{background:#000;border-top:1px solid var(--accent);border-bottom:1px solid var(--accent);}
  .terminal{max-width:900px;margin:0 auto;background:#000;border:1px solid var(--accent);box-shadow:0 0 40px rgba(0,240,138,.15);}
  .terminal-header{background:rgba(0,240,138,.1);padding:10px 18px;border-bottom:1px solid var(--accent);display:flex;align-items:center;gap:14px;}
  .terminal-header .dots{display:flex;gap:6px;}
  .terminal-header .dots span{width:10px;height:10px;border-radius:50%;background:var(--accent-dim);}
  .terminal-header .dots span:first-child{background:var(--warn);}
  .terminal-header .dots span:nth-child(2){background:#e8a020;}
  .terminal-header .title{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--accent);letter-spacing:.2em;}
  .terminal-body{padding:30px 24px;font-family:"VT323",monospace;font-size:18px;line-height:1.6;color:var(--accent);background:#000;min-height:300px;}
  .terminal-body .line{margin-bottom:6px;}
  .terminal-body .prompt{color:var(--cyan);}
  .terminal-body .meta{color:var(--mute);font-size:14px;}
  .terminal-body .alien{color:var(--magenta);}
  .terminal-body .cursor{display:inline-block;width:10px;height:18px;background:var(--accent);vertical-align:middle;animation:blink 1s steps(1) infinite;margin-left:4px;}
  @keyframes blink{50%{opacity:0;}}

  /* ── TECH STACK ── */
  .stack-section{background:var(--bg-2);}
  .stack{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border:1px solid var(--line);}
  .stack-item{padding:28px 30px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:120px 1fr;gap:24px;align-items:start;}
  .stack-item:nth-child(2n){border-right:none;}
  .stack-item:nth-last-child(-n+2){border-bottom:none;}
  .stack-item .role{font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--accent);letter-spacing:.25em;line-height:1.6;}
  .stack-item h4{font-family:"Shippori Mincho",serif;font-size:18px;color:var(--ink);margin-bottom:6px;}
  .stack-item .desc{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--ink-2);line-height:1.7;}

  /* ── DEVLOG ── */
  .devlog{display:flex;flex-direction:column;border-top:1px solid var(--line);}
  .devlog-item{display:grid;grid-template-columns:160px 100px 1fr;gap:30px;padding:24px 0;border-bottom:1px solid var(--line);align-items:start;}
  .devlog-item .date{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--mute);letter-spacing:.1em;padding-top:2px;}
  .devlog-item .tag{font-family:"JetBrains Mono",monospace;font-size:9px;letter-spacing:.2em;padding:3px 8px;color:var(--bg);background:var(--accent);justify-self:start;}
  .devlog-item .tag.warn{background:var(--cyan);}
  .devlog-item .tag.idea{background:var(--magenta);}
  .devlog-item .entry{font-size:14px;line-height:1.9;color:var(--ink);}
  .devlog-item .entry strong{color:var(--accent);font-weight:500;}

  /* ── CTA ── */
  .cta-section{background:var(--bg);text-align:left;border-top:none;}
  .cta-section .sec-head{margin-bottom:60px;}
  .cta-glow{padding:60px;border:1px solid var(--accent);background:radial-gradient(ellipse at center,rgba(0,240,138,.08),transparent 70%);position:relative;}
  .cta-glow::before,.cta-glow::after{content:"";position:absolute;width:30px;height:30px;border:2px solid var(--accent);}
  .cta-glow::before{top:-2px;left:-2px;border-right:none;border-bottom:none;}
  .cta-glow::after{bottom:-2px;right:-2px;border-left:none;border-top:none;}
  .cta-wrap{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;}
  .cta-head{font-family:"Shippori Mincho",serif;font-size:clamp(36px,5vw,64px);line-height:1.1;letter-spacing:-.02em;color:var(--ink);}
  .cta-head .acc{color:var(--accent);}
  .cta-right .label{font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--accent);letter-spacing:.25em;margin-bottom:14px;display:block;}
  .cta-right p{font-size:14px;line-height:1.9;color:var(--ink-2);margin-bottom:30px;}
  .cta-btn{display:inline-flex;align-items:center;gap:14px;padding:18px 28px;background:var(--accent);color:var(--bg);font-family:"JetBrains Mono",monospace;font-size:13px;letter-spacing:.2em;font-weight:600;transition:all .3s;box-shadow:0 0 30px rgba(0,240,138,.4);}
  .cta-btn:hover{transform:translateX(6px);box-shadow:0 0 50px rgba(0,240,138,.6);}
  .cta-btn::after{content:"→";}
  .back-link{margin-top:30px;display:inline-flex;align-items:center;gap:10px;font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--mute);letter-spacing:.2em;transition:color .3s;}
  .back-link:hover{color:var(--accent);}

  /* ── フッター ── */
  footer{background:#000;color:rgba(255,255,255,.85);padding:80px 36px 30px;border-top:1px solid var(--line);position:relative;z-index:2;}
  .foot-top{display:grid;grid-template-columns:auto 1fr;gap:80px;align-items:start;padding-bottom:50px;border-bottom:1px solid rgba(255,255,255,.12);}
  .foot-voxel{display:flex;align-items:center;justify-content:center;padding:10px;}
  .foot-voxel svg{width:130px;height:auto;display:block;}
  .foot-info{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;}
  .foot-info .col h5{font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--accent);letter-spacing:.25em;margin-bottom:18px;}
  .foot-info .col .item{font-family:"Shippori Mincho",serif;font-size:16px;color:#fff;margin-bottom:8px;line-height:1.4;}
  .foot-info .col .sub{font-family:"JetBrains Mono",monospace;font-size:10px;color:rgba(255,255,255,.45);letter-spacing:.1em;}
  .foot-info .nav-links a{display:block;font-family:"Zen Kaku Gothic New",sans-serif;font-size:13px;color:rgba(255,255,255,.7);margin-bottom:10px;transition:color .2s;}
  .foot-info .nav-links a:hover{color:var(--accent);}
  .foot-bottom{padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-family:"JetBrains Mono",monospace;font-size:10px;color:rgba(255,255,255,.4);letter-spacing:.2em;}
  .foot-bottom .tagline{color:var(--accent);}

  /* スマホ */
  @media (max-width:900px){
    header{padding:14px 18px;grid-template-columns:1fr auto;}
    nav,.meta-right{display:none;}
    .hero{padding:90px 20px 50px;min-height:auto;}
    .hero-stack{grid-template-columns:1fr;gap:40px;}
    .hero-side{padding-left:0;border-left:none;border-top:1px solid var(--line);padding-top:30px;width:100%;}
    section{padding:70px 20px;}
    .sec-head{grid-template-columns:1fr;gap:14px;margin-bottom:40px;}
    .sec-num{writing-mode:horizontal-tb;height:auto;}
    .sec-meta{text-align:left;}
    .concept-wrap,.world,.gameplay,.stack,.cta-wrap{grid-template-columns:1fr;}
    .gp-step,.stack-item{border-right:none;}
    .devlog-item{grid-template-columns:1fr;gap:8px;}
    .cta-glow{padding:30px;}
    .foot-top{grid-template-columns:1fr;gap:40px;}
    .foot-info{grid-template-columns:1fr;gap:30px;}
    .foot-voxel svg{width:100px;}
    .foot-bottom{flex-direction:column;gap:10px;text-align:center;}
  }