.auth-modal {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease-out), visibility 0.3s var(--ease-out);
}

.auth-modal.open { opacity: 1; visibility: visible; }

.auth-modal-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 440px;
    max-height: 90vh;
    padding: 2rem;
    position: relative;
    box-shadow: 0 20px 40px -10px rgba(13, 15, 20, 0.18);
    transform: scale(0.96);
    transition: transform 0.3s var(--ease-out);
    box-sizing: border-box;
    overflow-y: auto;
}

@media (max-width: 480px) {
    .auth-modal {
        padding: 0.75rem;
    }
    .auth-modal-content {
        padding: 1.25rem 1rem;
    }
    .form-row {
        flex-direction: column;
        gap: 0;
    }
}

.auth-modal.open .auth-modal-content { transform: scale(1); }

.auth-close-btn {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    color: var(--muted);
    padding: 4px;
    border-radius: 50%;
}
.auth-close-btn:hover { color: var(--ink); background: var(--bg); }

.auth-tabs { display: flex; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; }

.auth-tab {
    flex: 1;
    padding: 8px 0;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--muted);
    border-bottom: 2px solid transparent;
    transition: all 0.2s var(--ease-out);
}

.auth-tab.active { color: var(--accent); border-color: var(--accent); }

.auth-form { display: none; flex-direction: column; }
.auth-form.active { display: flex; }

.auth-title { font-family: var(--font-display); font-size: 1.4rem; font-weight: 500; margin-bottom: 0.35rem; }
.auth-sub { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 1rem; width: 100%; }
.form-row { display: flex; gap: 10px; width: 100%; }
.form-row .form-group { flex: 1; min-width: 0; }

.form-group input {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    font-size: 0.88rem;
    outline: none;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s var(--ease-out);
}

.form-group input:focus {
    border-color: var(--accent);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-auth-submit {
    background: var(--accent);
    color: #FFF;
    padding: 10px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    text-align: center;
    margin-top: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s var(--ease-out);
}
.btn-auth-submit:hover { background-color: var(--accent-hover); }

.forgot-password-row {
    display: flex;
    justify-content: flex-end;
    margin-top: -0.25rem;
    margin-bottom: 0.85rem;
}

.forgot-password-btn {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    transition: color 0.2s var(--ease-out);
}
.forgot-password-btn:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.btn-auth-back {
    background: transparent;
    color: var(--ink-soft);
    border: 1px solid var(--border);
    padding: 9px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.85rem;
    text-align: center;
    margin-top: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
.btn-auth-back:hover {
    background-color: var(--bg);
    color: var(--ink);
}