/* ===== Shared Reset & Base ===== */
:root{
  --bg:#ffffff;--card:#f8fafc;--ink:#0f172a;--sub:#334155;--muted:#64748b;
  --border:#e2e8f0;--accent:#2563eb;--accent-ink:#0b2a6f;
  --shadow:rgba(15,23,42,.08);
}
:root[data-theme="dark"]{
  --bg:#0f172a;--card:#1e293b;--ink:#e2e8f0;--sub:#94a3b8;--muted:#64748b;
  --border:#334155;--accent:#60a5fa;--accent-ink:#bfdbfe;
  --shadow:rgba(0,0,0,.3);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);
  line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

/* ===== Shared Layout ===== */
.wrap{max-width:860px;margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.back{display:inline-block;padding:1.5rem 0;font-size:.875rem;font-weight:600;color:var(--muted)}
.back:hover{color:var(--ink);text-decoration:none}
.nav-back{padding:2rem 0;border-top:1px solid var(--border);text-align:center}
.nav-back a{font-weight:600;color:var(--muted);font-size:.9rem}
.nav-back a:hover{color:var(--ink)}

/* ===== Shared Components ===== */
.btn{display:inline-block;padding:.45rem .85rem;border-radius:8px;background:var(--accent);color:var(--bg);font-weight:700;font-size:.875rem}
.btn:hover{filter:brightness(.92);text-decoration:none}

.contact-list{display:flex;flex-wrap:wrap;gap:.4rem 1rem;list-style:none;font-size:.9rem}
.contact-list a{color:var(--sub);font-weight:600} .contact-list a:hover{color:var(--accent)}
.contact-list li+li::before{content:"·";color:var(--muted);margin-right:0}

/* ===== Site Tools ===== */
.site-tools{display:flex;align-items:center;gap:.5rem}
.site-tools select{padding:.3rem .4rem;border:1px solid var(--border);border-radius:6px;background:var(--card);color:var(--ink);font-size:.78rem;font-weight:600;cursor:pointer}
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border:1px solid var(--border);border-radius:8px;background:var(--card);color:var(--ink);font-size:1.1rem;cursor:pointer;transition:background .15s,color .15s;line-height:1;padding:0}
.theme-toggle:hover{background:var(--accent);color:var(--bg)}

/* ===== Focus & Accessibility ===== */
:focus-visible{outline:3px solid #94a3b8;outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}