:root {
  --bg: #0f1221;
  --card: #151a2e;
  --text: #e9edf6;
  --muted: #a7b0c3;
  --accent1: #00eaff;
  --accent2: #6fff8b;
  --border: rgba(255,255,255,0.08);
}
@media (prefers-color-scheme: light) {
  :root { --bg:#f7f9fc; --card:#ffffff; --text:#101320; --muted:#4a5568; --border: rgba(0,0,0,0.06); --accent1: #007bff; --accent2: #28a745; }
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; padding:28px 20px; font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", "Apple SD Gothic Neo", "Inter", Arial, sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -20%, rgba(0,234,255,0.14), transparent 60%),
    radial-gradient(900px 500px at 110% 20%, rgba(111,255,139,0.14), transparent 55%),
    var(--bg);
  color:var(--text);
  line-height: 1.6;
}
.wrap{max-width:920px; margin:0 auto}
.hero{
  background: linear-gradient(135deg, rgba(0,234,255,0.15), rgba(111,255,139,0.10));
  border:1px solid var(--border); border-radius:16px; padding:28px 24px; margin-bottom:18px;
}
.badge{display:inline-block; padding:6px 12px; font-size:0.8rem; color:#0b1530; background:linear-gradient(90deg, var(--accent1), var(--accent2)); border-radius:999px; font-weight:700}
.title{ margin:12px 0 6px; font-size:clamp(1.6rem, 3vw, 2.3rem); font-weight:800; letter-spacing:-0.02em; }
.subtitle{ margin:0; color:var(--muted); font-size:0.95rem }

.card{ background:var(--card); border:1px solid var(--border); border-radius:16px; padding:24px; margin:14px 0; box-shadow: 0 6px 20px rgba(0,0,0,0.12) }

h2{font-size:1.1rem; margin:0 0 12px; letter-spacing:-0.01em; color: var(--accent1); border-bottom: 1px solid var(--border); padding-bottom: 8px; display: inline-block;}
h3{font-size:1rem; margin:16px 0 8px; color: var(--text);}

p{margin:0 0 12px; font-size: 0.95rem; color: var(--text); line-height: 1.75;}
ul, ol { margin: 0 0 12px; padding-left: 20px; font-size: 0.95rem; color: var(--text); line-height: 1.75; }
li { margin-bottom: 6px; }

a{color:var(--accent1); text-decoration:none; font-weight: 500;}
a:hover{text-decoration:underline}

.grid{display:grid; gap:14px; margin-top:10px}
@media(min-width:720px){ .grid{grid-template-columns: 1fr 1fr} }
.muted{color:var(--muted); font-size: 0.9rem;}

/* Table Style for Data Transfer */
table { width: 100%; border-collapse: collapse; margin: 10px 0 20px; font-size: 0.9rem; }
th, td { border: 1px solid var(--border); padding: 10px; text-align: left; }
th { background: rgba(255,255,255,0.05); color: var(--accent1); white-space: nowrap; }
td { color: var(--muted); }

footer{margin-top:40px; text-align:center; color:var(--muted); font-size:0.85rem; padding-bottom: 20px;}

.hero-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; }
.lang-btn {
  padding: 6px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}
.lang-btn:hover { border-color: var(--accent1); text-decoration: none; }