*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
:root{
  --bg:#1e1e2e;--bg-raised:#262638;--bg-deep:#1a1a28;
  --accent:#7c3aed;--accent-dim:rgba(124,58,237,0.2);
  --fg:#e4e4f0;--fg-dim:#9494ac;--fg-bright:#fff;
  --border:#3a3a52;--radius:10px;
  --font-ui:"Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI",sans-serif;
}
body{font-family:var(--font-ui);background:var(--bg);color:var(--fg);line-height:1.8;min-height:100vh;}
body::before{content:'';position:fixed;top:-30%;left:-20%;width:70vw;height:70vw;background:radial-gradient(circle,rgba(124,58,237,0.06) 0%,transparent 65%);pointer-events:none;}
.container{max-width:780px;margin:0 auto;padding:40px 20px 80px;position:relative;z-index:1;}
.back-link{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--fg-dim);text-decoration:none;margin-bottom:32px;transition:color 0.2s;}
.back-link:hover{color:var(--accent);}
.lang-header{margin-bottom:40px;}
.lang-icon{font-size:48px;margin-bottom:12px;}
h1{font-size:32px;font-weight:800;color:var(--fg-bright);margin-bottom:6px;}
.lang-tagline{font-size:16px;color:var(--fg-dim);margin-bottom:16px;}
.tag-row{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0;}
.tag{font-size:12px;font-weight:600;padding:3px 10px;border-radius:20px;}
.tag-good{background:rgba(16,185,129,0.15);color:#34d399;}
.tag-bad{background:rgba(239,68,68,0.15);color:#f87171;}
.section{margin-bottom:40px;}
.section-title{font-size:18px;font-weight:700;color:var(--fg-bright);margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid var(--border);}
.card{background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin-bottom:16px;}
.card p{font-size:14px;line-height:1.9;margin-bottom:10px;}
.card p:last-child{margin-bottom:0;}
.card strong{color:var(--fg-bright);}
.compare-table{width:100%;border-collapse:collapse;font-size:13px;margin:12px 0;}
.compare-table th{background:var(--bg-deep);color:var(--fg-dim);font-weight:700;padding:8px 12px;text-align:left;border-bottom:1px solid var(--border);}
.compare-table td{padding:10px 12px;border-bottom:1px solid var(--border);color:var(--fg);vertical-align:top;}
.compare-table tr:last-child td{border-bottom:none;}
.good{color:#34d399;}.bad{color:#f87171;}
.qa-item{margin-bottom:16px;}
.qa-q{font-size:14px;font-weight:700;color:var(--accent);margin-bottom:6px;}
.qa-a{font-size:14px;color:var(--fg);padding-left:16px;border-left:2px solid var(--border);}
.term{border-bottom:1px dashed var(--accent);cursor:help;color:#c4b5fd;transition:color 0.2s;}
.term:hover,.term:focus{color:#fff;}
.term-popup{display:none;}
#term-tooltip{display:none;position:fixed;background:var(--bg-raised);border:1px solid var(--accent);border-radius:8px;padding:8px 14px;font-size:13px;color:var(--fg);line-height:1.6;white-space:normal;max-width:300px;z-index:99999;box-shadow:0 8px 24px rgba(0,0,0,0.4);pointer-events:none;}
#term-tooltip::after{content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);border:6px solid transparent;border-top-color:var(--accent);}
#term-tooltip.below::after{top:auto;bottom:100%;border-top-color:transparent;border-bottom-color:var(--accent);}
.footer{margin-top:48px;padding-top:24px;border-top:1px solid var(--border);color:var(--fg-dim);font-size:13px;text-align:center;}
.footer a{color:var(--accent);text-decoration:none;}
body.light{--bg:#f8f9fa;--bg-raised:#fff;--bg-deep:#f1f3f5;--fg:#2d2d3f;--fg-dim:#6b7280;--fg-bright:#1a1a2e;--border:#e5e7eb;}
body.light #term-tooltip{background:#fff;box-shadow:0 8px 24px rgba(0,0,0,0.15);}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:6px;padding:4px 10px;cursor:pointer;font-size:15px;color:var(--fg-dim);position:fixed;top:20px;right:20px;z-index:100;transition:all 0.2s;}
.theme-toggle:hover{border-color:var(--accent);color:var(--fg);}
@media(max-width:600px){.container{padding:24px 14px 60px;}h1{font-size:24px;}}