:root{
  --bg:#cccccc;
  --card:#ffffff;
  --ink:#1b1b1b;
  --muted:#5f6368;
  --radius:18px;
  --shadow:0 14px 36px rgba(0,0,0,.18);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

/* Header */
header{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.6);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid rgba(0,0,0,.06);
}
.header-inner{
  max-width:1100px;margin:0 auto;
  padding:12px 18px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{font-weight:700;display:flex;align-items:center;gap:10px}
header a{color:var(--ink);text-decoration:none}
header a:hover{text-decoration:underline}

/* Main */
main{max-width:1100px;margin:24px auto;padding:0 16px}
.card{
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.photo{max-width:980px;margin:0 auto}
.photo img{display:block;width:100%;height:auto}
.caption{
  text-align:center;
  padding:16px 18px 22px;
  font-size:1.4rem;
  color:#333;
}