:root {
  --blue: #1A73E8;
  --gray: #F6F7FB;
  --text: #111827;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Pretendard', system-ui, sans-serif; color: var(--text); background: white; }
.container { max-width: 960px; margin: 0 auto; padding: 16px; }
.site-header { background: white; border-bottom: 1px solid #e5e7eb; position: sticky; top: 0; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { color: var(--blue); font-weight: 700; text-decoration: none; }
.nav { list-style: none; display: flex; gap: 12px; padding: 0; margin: 0; }
.nav a { text-decoration: none; color: #374151; }
.main { padding-top: 24px; padding-bottom: 48px; }
.hero { padding: 48px 0; text-align: center; }
.hero h1 { font-size: 28px; margin: 0 0 8px; }
.hero p { margin: 0 0 16px; color: #6b7280; }
.btn { display: inline-block; padding: 10px 16px; border-radius: 8px; text-decoration: none; border: 1px solid transparent; }
.btn-primary { background: var(--blue); color: white; }
.btn-outline { border-color: var(--blue); color: var(--blue); background: white; }
.card { background: white; border: 1px solid #e5e7eb; border-radius: 12px; padding: 16px; }
.form { display: grid; gap: 12px; max-width: 420px; margin: 0 auto; }
.form .row { display: grid; gap: 6px; }
input[type="text"], input[type="email"], input[type="password"] { padding: 10px 12px; border: 1px solid #d1d5db; border-radius: 8px; width: 100%; }
label { font-size: 14px; color: #374151; }
.actions { display: flex; gap: 8px; align-items: center; }
.muted { color: #6b7280; font-size: 14px; }
.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 12px; }
.alert-error { background: #FEF2F2; color: #991B1B; border: 1px solid #FCA5A5; }
.alert-success { background: #ECFDF5; color: #065F46; border: 1px solid #6EE7B7; }
.site-footer { border-top: 1px solid #e5e7eb; background: #fff; }