.auth-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 2rem 1rem;
}

body.auth-page .message-toast {
    top: 1rem;
    right: 1rem;
    left: auto;
}

body.auth-page .toast-item {
    background: var(--surface-elevated);
    border-color: var(--surface-border);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(var(--backdrop-blur-chrome));
    -webkit-backdrop-filter: blur(var(--backdrop-blur-chrome));
    min-width: min(360px, calc(100vw - 2rem));
}

body.auth-page .auth-section {
    min-height: 100vh;
    flex-direction: column;
}

.auth-shell {
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.auth-back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    align-self: flex-start;
    width: fit-content;
    max-width: 100%;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.2;
    padding: 0.55rem 0.95rem;
    margin-bottom: -1px;
    position: relative;
    z-index: 2;
    background: var(--surface-elevated);
    border: 1px solid var(--surface-border);
    border-bottom: none;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    backdrop-filter: blur(var(--backdrop-blur-chrome));
    -webkit-backdrop-filter: blur(var(--backdrop-blur-chrome));
    box-shadow: var(--shadow-lg);
    transition: color 0.2s ease;
}

.auth-back-link svg {
    flex-shrink: 0;
}

.auth-back-link:hover,
.auth-back-link:focus-visible {
    color: var(--primary);
    outline: none;
}

.auth-card {
    max-width: 420px;
    width: 100%;
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    border-start-start-radius: 0;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--surface-border);
    padding: 2.5rem 2rem;
    text-align: right;
    color: var(--text-primary);
    backdrop-filter: blur(var(--backdrop-blur-chrome));
    -webkit-backdrop-filter: blur(var(--backdrop-blur-chrome));
    transition: box-shadow 0.2s ease;
}

body.auth-page .auth-card:hover {
    transform: none;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.auth-mode-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.35rem;
    border-radius: var(--radius-lg);
    background: var(--surface-muted);
    border: 1px solid var(--surface-border);
}

.auth-mode-btn {
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    line-height: 1.4;
    padding: 0.7rem 0.5rem;
    border-radius: calc(var(--radius-lg) - 0.15rem);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.auth-mode-btn:hover,
.auth-mode-btn:focus-visible {
    color: var(--text-primary);
    outline: none;
}

.auth-mode-btn.is-active {
    background: var(--surface-elevated);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}


.auth-form .form-group {
    text-align: right;
    margin-bottom: 1.5rem;
}

.auth-form .form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.auth-form .form-control {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--input-border);
    padding: 0.85rem 1rem;
    background-color: var(--input-bg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    font-size: 0.95rem;
    color: var(--text-primary);
    backdrop-filter: blur(var(--backdrop-blur-chrome-subtle));
    -webkit-backdrop-filter: blur(var(--backdrop-blur-chrome-subtle));
}

.auth-form .form-control::placeholder {
    color: var(--input-placeholder);
}

.auth-form .form-control:focus {
    outline: none;
    border-color: var(--input-border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    background-color: var(--surface-card-hover);
}

.otp-inputs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin: 0 auto 0.5rem;
    direction: ltr;
}

.otp-input {
    width: 3.1rem;
    height: 3.6rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 1.35rem;
    font-weight: 700;
    text-align: center;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.otp-input:focus {
    outline: none;
    border-color: var(--input-border-focus);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

.otp-input.is-filled {
    border-color: var(--primary-light);
    background: rgba(99, 102, 241, 0.08);
}

.auth-submit {
    width: 100%;
    border: 1px solid var(--primary);
    border-radius: var(--radius-lg);
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    padding: 0.95rem 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.auth-submit:hover,
.auth-submit:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--primary-light);
    border-color: var(--primary-light);
}

.auth-hint {
    margin-top: 1.5rem;
    padding: 1.1rem;
    border-radius: var(--radius-lg);
    background: var(--surface-muted);
    color: var(--text-secondary);
    border: 1px solid var(--surface-border);
    text-align: right;
}

.auth-hint strong {
    color: var(--text-primary);
}

.auth-hint .masked-contact {
    direction: ltr;
    unicode-bidi: plaintext;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.25rem 0.7rem;
    border-radius: var(--radius-pill);
    background: rgba(99, 102, 241, 0.12);
    box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.18);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: inherit;
}

.auth-hint .text-muted {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.auth-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.auth-resend {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.auth-inline-form {
    display: inline-flex;
}

.link-button {
    border: none;
    background: transparent;
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    position: relative;
    text-decoration: none;
}

.link-button::after {
    content: "";
    position: absolute;
    bottom: -2px;
    right: 0;
    left: auto;
    width: 100%;
    height: 2px;
    background: rgba(99, 102, 241, 0.3);
    transition: background 0.2s ease;
}

.link-button:hover::after,
.link-button:focus::after {
    background: var(--primary);
}

.link-button.is-disabled {
    color: var(--text-tertiary);
    cursor: not-allowed;
    pointer-events: none;
}

.link-button.is-disabled::after {
    background: transparent;
}

.auth-resend-timer {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 1.25rem;
}

.auth-footnote {
    margin-top: 2.5rem;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.form-error {
    color: var(--state-error-color);
    font-size: 0.8rem;
    margin-top: 0.35rem;
    display: block;
}

.auth-form-alert {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius-lg);
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: #ef4444;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.7;
    text-align: center;
    animation: authAlertIn 0.28s ease;
}

.auth-form-alert[hidden] {
    display: none !important;
}

@keyframes authAlertIn {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 575px) {
    .auth-card {
        padding: 2rem 1.5rem;
        border-radius: var(--radius-xl);
        border-start-start-radius: 0;
    }

    .auth-mode-switch {
        gap: 0.35rem;
        padding: 0.3rem;
    }

    .auth-mode-btn {
        font-size: 0.8rem;
        padding: 0.65rem 0.35rem;
    }

    .otp-inputs {
        gap: 0.65rem;
    }

    .otp-input {
        width: 2.6rem;
        height: 3.1rem;
        font-size: 1.2rem;
    }
}

html[data-theme="light"] .auth-card,
html[data-theme="light"] .auth-back-link {
    background: var(--surface-card);
}

html[data-theme="light"] .auth-card:hover {
    box-shadow: 0 30px 60px rgba(148, 163, 184, 0.28);
}

/* Referral Code Section */
.referral-section {
    margin-bottom: 1.5rem;
}

.referral-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px dashed var(--input-border);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.referral-toggle:hover {
    background: var(--surface-muted);
    border-color: var(--primary);
    color: var(--primary);
}

.referral-toggle .toggle-icon {
    transition: transform 0.3s ease;
}

.referral-toggle.is-active .toggle-icon {
    transform: rotate(45deg);
}

.referral-field-wrapper {
    margin-top: 1rem;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.referral-validation-message {
    margin-top: 0.5rem;
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    display: none;
}

.referral-validation-message.is-valid {
    display: block;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.referral-validation-message.is-invalid {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.referral-validation-message.is-validating {
    display: block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

#referral-code-input.is-valid {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.05);
}

#referral-code-input.is-invalid {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.05);
}

@media (max-width: 575px) {
    .referral-toggle {
        font-size: 0.85rem;
        padding: 0.65rem 0.9rem;
    }

    .referral-validation-message {
        font-size: 0.8rem;
        padding: 0.6rem 0.8rem;
    }
}