/* ==========================================================================
   NBG Arena — Refined auth experience
   ========================================================================== */

body.auth-layout {
    background: var(--nbg-bg-warm);
}

body.auth-layout .site-nav {
    border-bottom: 1px solid var(--nbg-border);
}

.auth-page {
    min-height: calc(100vh - 72px);
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
}

.auth-brand-panel {
    padding: clamp(2rem, 5vw, 4rem);
    position: relative;
}

.auth-brand-panel::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--nbg-indigo), var(--nbg-emerald), var(--nbg-gold));
}

.auth-brand-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--nbg-gold-light);
    margin-bottom: 1.5rem;
}

.auth-stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.auth-stat {
    min-width: 80px;
}

.auth-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
}

.auth-stat-label {
    font-size: 0.75rem;
    opacity: 0.65;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.auth-form-panel {
    padding: clamp(1.5rem, 4vw, 3rem);
    background:
        radial-gradient(ellipse 80% 60% at 100% 0%, rgba(79, 70, 229, 0.06), transparent 50%),
        var(--nbg-bg-warm);
}

.auth-card {
    max-width: 460px;
    margin: 0 auto;
    padding: clamp(1.75rem, 4vw, 2.75rem);
    border-radius: var(--radius-lg);
    border: 1px solid var(--nbg-border);
    box-shadow: 0 20px 50px rgba(12, 18, 34, 0.08);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--nbg-indigo), var(--nbg-emerald));
}

.auth-card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(5, 150, 105, 0.1));
    margin-bottom: 1.25rem;
}

.auth-card h2 {
    font-size: clamp(1.35rem, 3vw, 1.65rem);
    margin-bottom: 0.35rem;
}

.auth-card .subtitle {
    margin-bottom: 1.75rem;
    line-height: 1.5;
}

.auth-field {
    margin-bottom: 1.15rem;
}

.auth-field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--nbg-slate);
    margin-bottom: 0.4rem;
    letter-spacing: 0.02em;
}

.auth-field .form-control,
.auth-field .form-select {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--nbg-border);
    background: #fff;
    font-size: 0.95rem;
}

.auth-field .form-control:focus,
.auth-field .form-select:focus {
    border-color: var(--nbg-indigo);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--nbg-text-muted);
    font-size: 0.8rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--nbg-border);
}

.auth-footer-link {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--nbg-border);
    font-size: 0.9rem;
    color: var(--nbg-text-muted);
}

.auth-footer-link a {
    font-weight: 800;
    color: var(--nbg-indigo);
    text-decoration: none;
}

.auth-footer-link a:hover {
    text-decoration: underline;
}

.auth-steps {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.auth-step {
    flex: 1;
    height: 4px;
    border-radius: 999px;
    background: var(--nbg-border);
}

.auth-step.active {
    background: linear-gradient(90deg, var(--nbg-indigo), var(--nbg-emerald));
}

.auth-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
    font-size: 0.75rem;
    color: var(--nbg-text-muted);
}

.auth-trust span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.username-field-wrap {
    position: relative;
}

.username-prefix {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 700;
    color: var(--nbg-text-muted);
    pointer-events: none;
}

.username-field-wrap .form-control {
    padding-left: 2.1rem;
}

.username-feedback {
    font-size: 0.78rem;
    margin-top: 0.4rem;
    min-height: 1.2em;
    font-weight: 600;
}

.username-feedback.checking { color: var(--nbg-text-muted); }
.username-feedback.available { color: var(--nbg-emerald); }
.username-feedback.taken,
.username-feedback.invalid { color: #dc2626; }

@media (max-width: 991.98px) {
    .auth-page {
        grid-template-columns: 1fr;
    }

    .auth-brand-panel {
        display: none;
    }

    .auth-form-panel {
        min-height: calc(100vh - 72px);
        align-items: center;
    }
}