/* 登录页面专用样式 */
body {
    background-color: var(--bg-color);
    background-image: url('https://source.unsplash.com/random/1920x1080/?technology');
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

.overlay {
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(5px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 18px;
    width: 36px;
    height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: rotate(45deg);
}

.language-selector {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
}

.language-selector select {
    padding: 8px 15px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    color: white;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
}

.language-selector select:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.language-selector select option {
    background-color: var(--card-bg);
    color: var(--text-color);
}

.main-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: 20px;
}

.login-container {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    width: 450px;
    padding: 35px;
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.5s ease;
}

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

.login-container::before {
    content: "";
    position: absolute;
    top: -50px;
    left: -50px;
    width: 100px;
    height: 100px;
    background-color: var(--primary-color);
    border-radius: 50%;
    opacity: 0.1;
}

.login-container::after {
    content: "";
    position: absolute;
    bottom: -50px;
    right: -50px;
    width: 100px;
    height: 100px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    opacity: 0.1;
}

.logo {
    text-align: center;
    margin-bottom: 25px;
    position: relative;
}

.logo img {
    width: 90px;
    height: 90px;
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 5px;
    background-color: #fff;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.05);
}

h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 28px;
}

.subtitle {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 30px;
    font-size: 14px;
}

.tab-container {
    display: flex;
    margin-bottom: 25px;
}

.tab {
    flex: 1;
    text-align: center;
    padding: 12px 0;
    cursor: pointer;
    border-bottom: 2px solid var(--border-color);
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab.active {
    border-bottom: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 22px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
    font-size: 14px;
}

.input-with-icon {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--light-text);
}

.form-control {
    width: 100%;
    height: 48px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0 15px 0 45px;
    font-size: 15px;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 137, 220, 0.2);
    outline: none;
}

.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--light-text);
}

.validation-message {
    margin-top: 6px;
    font-size: 12px;
    color: var(--error-color);
    display: none;
}

.validation-message.show {
    display: block;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.remember-forgot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.remember-me {
    display: flex;
    align-items: center;
}

.custom-checkbox {
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
    color: var(--light-text);
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 18px;
    width: 18px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    transition: all 0.2s ease;
}

.custom-checkbox:hover input ~ .checkmark {
    border-color: var(--primary-color);
}

.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}

.custom-checkbox .checkmark:after {
    left: 6px;
    top: 2px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.forgot-password a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.forgot-password a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.btn-login {
    width: 100%;
    height: 48px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-login:hover {
    background-color: var(--primary-hover);
}

.btn-login:active {
    transform: scale(0.98);
}

.btn-login .loading {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.btn-login.loading-state {
    color: transparent;
}

.btn-login.loading-state .loading {
    display: block;
}

.divider {
    display: flex;
    align-items: center;
    margin: 30px 0;
}

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

.divider span {
    padding: 0 15px;
    color: var(--light-text);
    font-size: 14px;
}

.social-login {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 25px;
}

.social-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(245, 245, 245, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.social-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    transition: left 0.7s ease;
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.social-btn:hover::before {
    left: 100%;
}

.social-btn img {
    width: 25px;
    height: 25px;
}

.social-btn.wechat {
    background-color: rgba(9, 187, 7, 0.1);
    border-color: rgba(9, 187, 7, 0.3);
}

.social-btn.qq {
    background-color: rgba(18, 183, 245, 0.1);
    border-color: rgba(18, 183, 245, 0.3);
}

.signup {
    text-align: center;
    margin-top: 25px;
    font-size: 14px;
    color: var(--light-text);
}

.signup a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.signup a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.qr-code-login {
    text-align: center;
}

.qr-code {
    width: 180px;
    height: 180px;
    margin: 20px auto;
    padding: 10px;
    background-color: white;
    border-radius: 6px;
}

.qr-code img {
    width: 100%;
    height: 100%;
}

.qr-code-tip {
    font-size: 14px;
    color: var(--light-text);
    margin-bottom: 25px;
}

footer {
    text-align: center;
    padding: 20px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 576px) {
    .login-container {
        width: 100%;
        padding: 25px;
        border-radius: 10px;
    }

    .theme-toggle,
    .language-selector {
        top: 10px;
    }

    .logo img {
        width: 70px;
        height: 70px;
    }

    h1 {
        font-size: 22px;
    }

    .social-login {
        gap: 15px;
    }

    .social-btn {
        width: 45px;
        height: 45px;
    }

    .main-container {
        padding: 0;
    }
}

/* 暗色模式适配 */
body.theme-dark .overlay {
    background-color: rgba(0, 0, 0, 0.6);
}

body.theme-dark .login-container {
    background-color: rgba(45, 45, 45, 0.9);
}

body.theme-dark .logo img {
    background-color: #333;
}

body.theme-dark .checkmark {
    background-color: #333;
}

body.theme-dark .form-control {
    background-color: rgba(60, 60, 60, 0.8);
    color: #ddd;
}

body.theme-dark .social-btn {
    background-color: rgba(50, 50, 50, 0.5);
}