:root {
  color-scheme: light;
  --bg: #eef2f7;
  --panel: #ffffff;
  --panel-soft: #f1f5f9;
  --line: #d9e2ec;
  --text: #111827;
  --muted: #64748b;
  --accent: #0f766e;
  --blue: #2563eb;
  --danger: #b42318;
  --shadow: 0 24px 70px rgba(15, 23, 42, .18);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 460px;
  background:
    radial-gradient(circle at 18% 12%, rgba(37,99,235,.18), transparent 30%),
    radial-gradient(circle at 74% 78%, rgba(20,184,166,.18), transparent 32%),
    linear-gradient(135deg, #0f172a 0%, #172554 46%, #0f766e 100%);
  color: var(--text);
  font-family: Inter, Arial, "Noto Sans KR", sans-serif;
}
.hero { padding: clamp(32px, 6vw, 78px); color: white; display: grid; align-content: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 14px; }
.mark { width: 54px; height: 54px; border-radius: 18px; display: grid; place-items: center; font-weight: 950; letter-spacing: -.06em; background: linear-gradient(135deg, #14b8a6, #3b82f6); box-shadow: inset 0 1px 0 rgba(255,255,255,.28), 0 18px 40px rgba(0,0,0,.22); }
.brand strong { display: block; font-size: 22px; letter-spacing: -.04em; }
.brand small { display: block; color: #bfdbfe; margin-top: 2px; }
h1 { margin: 0; font-size: clamp(38px, 5vw, 68px); line-height: .98; letter-spacing: -.07em; max-width: 780px; }
.hero p { margin: 0; max-width: 620px; color: #dbeafe; font-size: 17px; line-height: 1.7; }
.badges { display: flex; flex-wrap: wrap; gap: 10px; }
.badges span { border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.10); color: #e0f2fe; border-radius: 999px; padding: 8px 12px; font-size: 13px; font-weight: 800; backdrop-filter: blur(10px); }
.login-wrap { display: grid; place-items: center; padding: 28px; background: rgba(248,250,252,.86); backdrop-filter: blur(18px); border-left: 1px solid rgba(255,255,255,.25); }
.card { width: min(100%, 390px); background: rgba(255,255,255,.94); border: 1px solid rgba(148,163,184,.35); border-radius: 28px; padding: 30px; box-shadow: var(--shadow); }
.card h2 { margin: 0; font-size: 28px; letter-spacing: -.05em; }
.card p { margin: 8px 0 0; color: var(--muted); line-height: 1.55; }
label { display: grid; gap: 8px; color: #334155; font-size: 13px; font-weight: 850; margin-top: 18px; }
input { width: 100%; height: 46px; border: 1px solid var(--line); border-radius: 14px; padding: 0 14px; font: inherit; background: #fff; }
input:focus { outline: none; border-color: rgba(37,99,235,.65); box-shadow: 0 0 0 4px rgba(37,99,235,.11); }
button { width: 100%; min-height: 48px; border: 0; border-radius: 15px; background: linear-gradient(135deg, var(--accent), var(--blue)); color: white; font: inherit; font-weight: 900; margin-top: 22px; cursor: pointer; box-shadow: 0 16px 28px rgba(15,118,110,.22); }
.error { color: var(--danger); background: #fee4e2; border: 1px solid #fecdca; border-radius: 14px; padding: 11px 12px; margin: 14px 0 0; }
.meta { margin-top: 18px !important; font-size: 12px; word-break: break-all; }
@media (max-width: 900px) {
  body { grid-template-columns: 1fr; }
  .hero { min-height: 42vh; padding: 32px 24px; }
  .login-wrap { border-left: 0; }
}