*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --primary: #1a73e8; --primary-dark: #1557b0; --success: #34a853; --error: #ea4335;
    --bg: #f5f7fa; --card-bg: #ffffff; --text: #202124; --text-light: #5f6368;
    --border: #dadce0; --radius: 12px; --shadow: 0 2px 8px rgba(0,0,0,0.08);
}
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; background: var(--primary); color: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.nav-brand { font-weight: 700; font-size: 1.1rem; }
.nav-link { color: #fff; text-decoration: none; font-size: 0.9rem; opacity: 0.9; }
.nav-link:hover { opacity: 1; text-decoration: underline; }
.container { max-width: 720px; margin: 0 auto; padding: 24px 16px; }
.auth-card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 40px 32px; max-width: 420px; margin: 60px auto; text-align: center; }
.auth-title { font-size: 1.5rem; margin-bottom: 8px; }
.auth-subtitle { color: var(--text-light); margin-bottom: 24px; font-size: 0.95rem; }
.auth-form { text-align: left; }
.success-icon { width: 64px; height: 64px; border-radius: 50%; background: var(--success); color: #fff; font-size: 2rem; line-height: 64px; margin: 0 auto 16px; display: block; text-align: center; }
.form-card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px 24px; }
.form-title { font-size: 1.25rem; margin-bottom: 20px; color: var(--text); }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 0.875rem; margin-bottom: 4px; color: var(--text); }
.req { color: var(--error); }
input[type="text"], input[type="email"], input[type="number"], select, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem; background: #fff; color: var(--text); transition: border-color 0.2s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,115,232,0.15); }
input[type="number"] { -moz-appearance: textfield; }
textarea { resize: vertical; }
.char-count { text-align: right; font-size: 0.8rem; color: var(--text-light); margin-top: 2px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 500px) { .form-row { grid-template-columns: 1fr; } }
.form-fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 16px; margin-bottom: 16px; }
.form-fieldset legend { font-weight: 700; font-size: 0.9rem; padding: 0 8px; color: var(--primary); }
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
.metric input { text-align: center; }
.btn { display: inline-block; padding: 12px 24px; border: none; border-radius: 8px; cursor: pointer; font-size: 1rem; font-weight: 600; text-decoration: none; text-align: center; transition: background 0.2s, transform 0.1s; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-block { display: block; width: 100%; }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: 0.95rem; background: #e8f0fe; color: var(--primary); }
.alert-success { background: #e6f4ea; color: #137333; }
.alert-error { background: #fce8e6; color: #c5221f; }
.alert ul { margin: 4px 0 0 20px; }