* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #ffffff;
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    width: 100%;
}

.brand {
    text-align: center;
    margin-bottom: 40px;
}

.brand h1 {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: #1a1a1a;
}

.brand span {
    color: #666;
    font-size: 1rem;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    background-color: #f9f9f9;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.tabs {
    display: none; /* 移除註冊和登入切換 Tab */
}

.tab {
    flex: 1;
    text-align: center;
    padding: 12px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    position: relative;
}

.tab.active {
    color: #1a1a1a;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #1a1a1a;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: #1a1a1a;
}

input {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border: 1px solid #e6e6e6;
    border-radius: 8px;
    background-color: #ffffff;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #1a1a1a;
}

.forgot-password {
    display: block;
    font-size: 14px;
    text-align: right;
    color: #1a1a1a;
    margin-top: 8px;
    text-decoration: none;
}

.button {
    width: 100%;
    padding: 14px;
    background-color: #1a1a1a;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}

.button:hover {
    background-color: #333;
}

.social-login {
    margin-top: 30px;
}

.social-login-divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
}

.social-login-divider::before,
.social-login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: #e6e6e6;
}

.social-login-divider span {
    padding: 0 10px;
    color: #999;
    font-size: 14px;
}

.social-buttons {
    display: flex;
    gap: 10px;
}

.social-button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    border: 1px solid #e6e6e6;
    border-radius: 8px;
    background-color: #ffffff;
    cursor: pointer;
    transition: background-color 0.3s;
}

.social-button:hover {
    background-color: #f5f5f5;
}

/* 隱藏註冊表單 */
.register-form {
    display: none;
}

/* 確保只有登入表單顯示 */
#forms-container.show-register .login-form {
    display: none;
}

#forms-container.show-register .register-form {
    display: block;
}