/* Student auth pages (login / signup) */
.auth-section {
    background: linear-gradient(160deg, var(--color-surface) 0%, #ffffff 60%);
    min-height: calc(100vh - 260px);
    display: flex;
    /* Anchor to the top, not vertically centered: centering made the card re-center
       (a visible up-then-settle jump) whenever async content — the Google button
       iframe or the icon/web font swapping in — changed its height after first paint. */
    align-items: flex-start;
}

/* Reserve the Google button's height so its async iframe load doesn't reflow the card. */
.g_id_signin {
    min-height: 44px;
}

.auth-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border) !important;
}

.auth-title {
    color: var(--color-primary);
}

.auth-section .form-label {
    color: var(--color-text);
}

.auth-section .input-group-text {
    border-color: var(--color-border);
    color: var(--color-primary);
}

.auth-section .form-control {
    border-color: var(--color-border);
    padding: 0.625rem 0.75rem;
}

.auth-section .form-control:focus {
    border-color: var(--input-border-focus);
    box-shadow: var(--input-shadow-focus);
}

.btn-auth-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    font-weight: 600;
    border-radius: var(--btn-radius);
    padding: 0.625rem 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}

.btn-auth-primary:hover,
.btn-auth-primary:focus {
    background: var(--btn-primary-hover-bg);
    color: var(--btn-primary-text);
}

.btn-auth-primary:disabled {
    opacity: 0.7;
}

.btn-google {
    background: #ffffff;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 600;
    border-radius: var(--btn-radius);
    padding: 0.625rem 1rem;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}

.btn-google:hover,
.btn-google:focus {
    background: var(--color-surface);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
    color: var(--color-text);
}

.auth-link {
    color: var(--color-primary);
    text-decoration: none;
}

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

/* "or" divider */
.auth-divider {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid var(--color-border);
}

.auth-divider span {
    padding: 0 0.75rem;
}

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

.auth-steps .step {
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background: var(--color-border);
    transition: background 0.3s ease;
}

.auth-steps .step.active {
    background: var(--color-accent);
}

.auth-steps .step.done {
    background: var(--color-primary);
}

.verified-badge {
    color: var(--color-success);
    font-size: 0.8rem;
    font-weight: 600;
}

/* Password strength meter */
.pw-bars {
    display: flex;
    gap: 4px;
}

.pw-bars span {
    flex: 1;
    height: 5px;
    border-radius: 3px;
    background: var(--color-border);
    transition: background 0.25s ease;
}

.pw-strength[data-score="1"] .pw-bars span:nth-child(-n+1),
.pw-strength[data-score="2"] .pw-bars span:nth-child(-n+2),
.pw-strength[data-score="3"] .pw-bars span:nth-child(-n+3),
.pw-strength[data-score="4"] .pw-bars span:nth-child(-n+4) {
    background: var(--_pw-color, var(--color-primary));
}

.pw-strength[data-score="1"] { --_pw-color: var(--color-error); }
.pw-strength[data-score="2"] { --_pw-color: #d98c1f; }
.pw-strength[data-score="3"] { --_pw-color: #2f9e44; }
.pw-strength[data-score="4"] { --_pw-color: var(--color-success); }

.pw-strength[data-score="1"] .pw-strength-label { color: var(--color-error); }
.pw-strength[data-score="2"] .pw-strength-label { color: #d98c1f; }
.pw-strength[data-score="3"] .pw-strength-label { color: #2f9e44; }
.pw-strength[data-score="4"] .pw-strength-label { color: var(--color-success); }