:root{
  --bg:#ffffff;
  --panel:#f7f7f8;
  --text:#0f172a;
  --muted:#475569;
  --border:rgba(15,23,42,.12);
  --accent:#2563eb;
  --shadow:0 10px 30px rgba(15,23,42,.08);
  --radius:18px;
}

html[data-theme="dark"]{
  --bg:#0b1220;
  --panel:#0f1a2e;
  --text:#e5e7eb;
  --muted:#a3adc2;
  --border:rgba(229,231,235,.12);
  --accent:#60a5fa;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --radius:18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
.container{ width:min(1100px,92vw); margin:0 auto; }

.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

.muted{ color:var(--muted); }
.accent{ color:var(--accent); }

.section{ padding:64px 0; }
.section.subtle{
  background:linear-gradient(180deg,transparent,rgba(37,99,235,.06));
}

.h3{ font-size:1.15rem; margin:0 0 12px; }

.badge{
  display:inline-block;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(37,99,235,.06);
  font-size:.9rem;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;
  border-radius:999px;
  border:1px solid var(--border);
  background:transparent;
  gap:8px;
}
.btn.primary{
  background:var(--accent);
  color:#fff;
  border-color:transparent;
}

.text-link{ color:var(--accent); font-weight:600; }
.text-link:hover{ text-decoration:underline; }

/* Header / Nav */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  border-bottom:1px solid var(--border);
  background:color-mix(in srgb,var(--bg) 90%,transparent);
  backdrop-filter:blur(10px);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
}

.logo{ font-weight:800; font-size:1.15rem; }
.dot{ color:var(--accent); }

.nav-menu{
  list-style:none;
  display:flex;
  gap:14px;
  margin:0;
  padding:0;
  align-items:center;
}

.nav-link{
  padding:8px 10px;
  border-radius:999px;
}
.nav-link:hover{
  background:rgba(37,99,235,.10);
}

.theme-btn{
  border:1px solid var(--border);
  background:transparent;
  border-radius:999px;
  padding:8px 10px;
  cursor:pointer;
}

.nav-toggle{ display:none; }

/* Hero */
.hero{ padding:58px 0 26px; }
.hero-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr;
  gap:22px;
  align-items:start;
}

.hero-text h1{
  font-size:clamp(2rem,4vw,3rem);
  margin:12px 0;
}

.lead{
  font-size:1.05rem;
  color:var(--muted);
  max-width:58ch;
}

.cta-row{
  display:flex;
  gap:12px;
  margin:18px 0 10px;
  flex-wrap:wrap;
}

.link-row{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}

.hero-card{
  border:1px solid var(--border);
  background:var(--panel);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}

.avatar{
  width:100%;
  height:260px;
  object-fit:cover;
}

.hero-card-body{ padding:16px; }

/* Footer */
.footer{
  border-top:1px solid var(--border);
  padding:22px 0;
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}