:root {
  --yellow: #FBB72C;
  --black: #111111;
  --ink: #1a1a1a;
  --muted: #8a8a8a;
  --bg: #fafafa;
  --err: #c0392b;
  --border: #e5e5e5;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Noto Sans KR", "Segoe UI", sans-serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
.auth-body {
  background:
    radial-gradient(ellipse at top left, rgba(251,183,44,.18), transparent 55%),
    radial-gradient(ellipse at bottom right, rgba(17,17,17,.05), transparent 55%),
    var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 28px 24px;
  box-shadow: 0 12px 40px -16px rgba(0,0,0,.12), 0 2px 6px rgba(0,0,0,.04);
}

.auth-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--black);
  color: #fff;
  border-radius: 999px;
  font-weight: 800;
  letter-spacing: .08em;
  margin-bottom: 20px;
}
.auth-brand .bolt { color: var(--yellow); font-size: 16px; line-height: 1; }
.auth-brand .brand-name { font-size: 13px; }

.auth-card h1 {
  font-size: 22px;
  margin: 0 0 6px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.muted { color: var(--muted); font-size: 13px; margin: 0 0 20px; }

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: .02em;
  text-transform: uppercase;
}
.auth-form input {
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.auth-form input:focus {
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(17,17,17,.08);
}

.auth-err {
  color: var(--err);
  font-size: 13px;
  min-height: 18px;
}

.auth-form .primary {
  margin-top: 4px;
  background: var(--black);
  color: #fff;
  border: none;
  padding: 13px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, transform .05s;
}
.auth-form .primary:hover:not(:disabled) { background: #000; }
.auth-form .primary:active:not(:disabled) { transform: translateY(1px); }
.auth-form .primary:disabled { opacity: .6; cursor: wait; }

.auth-back {
  display: block;
  text-align: center;
  margin-top: 20px;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}
.auth-back:hover { color: var(--ink); }