.auth-container {
    background: var(--surface);
    padding: 2.1rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 420px;
    text-align: center;
    border: 1px solid var(--border);
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    margin: 0 auto;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.auth-container h1,
.auth-container h2 {
    margin-bottom: 1.5rem;
    color: var(--text-main);
    font-size: 1.6rem;
    font-weight: 800;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-sub);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.input-group input {
    margin-bottom: 0;
    flex: 1;
}

.input-group button {
    width: auto;
    padding: 0 1rem;
    margin-top: 0;
    white-space: nowrap;
    background-color: var(--surface);
    color: var(--text-main);
    border: 1px solid var(--border);
    font-size: 0.9rem;
    box-shadow: none;
}

.input-group button:hover {
    background-color: #f8fafc;
    border-color: var(--border-strong);
}

input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-sizing: border-box;
    font-size: 0.95rem;
    background-color: var(--surface);
    transition: all 0.2s;
    color: var(--text-main);
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

input[readonly], input[disabled] {
    background-color: var(--surface-muted);
    color: var(--text-sub);
    cursor: not-allowed;
}

button.btn-login, button.btn-join {
    width: 100%;
    padding: 0.85rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    color: white;
    transition: all 0.2s;
    margin-top: 0.5rem;
    background-color: var(--primary);
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.22);
}

button.btn-login:hover, button.btn-join:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(37, 99, 235, 0.3);
}

button:disabled {
    background-color: #d1d6db;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.error {
    color: var(--negative);
    margin-bottom: 1rem;
    font-size: 0.88rem;
    background-color: #fff5f5;
    padding: 0.8rem;
    border-radius: var(--radius);
    border: 1px solid #ffe0e0;
    text-align: left;
}

.auth-links {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-sub);
}

.auth-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

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

.agreement-section {
    margin-bottom: 1.5rem;
    text-align: left;
}

.agreement-section p {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.scroll-box {
    height: 120px;
    overflow-y: auto;
    border: 1px solid var(--border);
    padding: 1rem;
    font-size: 0.85rem;
    background: var(--surface-muted);
    margin-bottom: 0.8rem;
    border-radius: var(--radius);
    color: var(--text-sub);
    line-height: 1.6;
}

.agreement-section label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
    cursor: pointer;
    color: var(--text-main);
}

.agreement-section input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    margin: 0;
    flex-shrink: 0;
    accent-color: var(--primary);
}

.auth-field {
    margin-bottom: 1rem;
    text-align: left;
}

.auth-field label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.auth-link-danger {
    background: none;
    border: none;
    color: var(--negative);
    font-weight: 600;
    padding: 0;
    cursor: pointer;
    font-size: 0.95rem;
}

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

.auth-divider {
    margin-top: 1.75rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    text-align: center;
}

.modal-text {
    color: var(--text-sub);
    margin: 0.75rem 0 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}