html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #60a5fa 100%);
    color: #1e293b;
    line-height: 1.6;
}

.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.login-wrapper {
    width: 100%;
    max-width: 450px;
}

.login-box {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    padding: 40px 30px;
    text-align: center;
    color: #fff;
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.login-logo i {
    font-size: 2.5rem;
    color: #fff;
}

.login-logo h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
    color: #fff;
}

.login-subtitle {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.login-tabs {
    display: flex;
    background: #f8fafc;
    border-bottom: 2px solid #e2e8f0;
}

.tab-btn {
    flex: 1;
    padding: 15px;
    border: none;
    background: transparent;
    font-size: 16px;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn:hover {
    color: #3b82f6;
    background: #f1f5f9;
}

.tab-btn.active {
    color: #3b82f6;
    background: #fff;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #1e40af 0%, #3b82f6 100%);
}

.tab-content {
    padding: 30px;
}

.auth-form {
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease-out;
}

.auth-form.active {
    display: block;
    opacity: 1;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

.input-icon-wrapper i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    font-size: 16px;
    z-index: 1;
}

.form-control {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 15px;
    color: #1e293b;
    transition: all 0.3s ease;
    background: #fff;
}

.form-control:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control.error {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-control.error:focus {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.form-control::placeholder {
    color: #94a3b8;
}

.captcha-wrapper {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-wrapper .form-control {
    flex: 1;
}

.captcha-img {
    height: 42px;
    border-radius: 10px;
    cursor: pointer;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
}

.captcha-img:hover {
    border-color: #3b82f6;
}

.checkbox-wrapper {
    margin-bottom: 25px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
    color: #64748b;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e1;
    border-radius: 5px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    border-color: #3b82f6;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 12px;
    font-weight: bold;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 30px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    pointer-events: auto;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: #fff;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
}

.login-footer {
    text-align: center;
    padding: 20px 30px;
    background: #f8fafc;
    border-top: 1px solid #e2e8f0;
}

.login-footer p {
    margin: 0;
    font-size: 13px;
    color: #94a3b8;
}

.hide {
    display: none !important;
}

@media (max-width: 768px) {
    .login-container {
        padding: 10px;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .login-logo h1 {
        font-size: 1.5rem;
    }
    
    .tab-content {
        padding: 20px;
    }
    
    .form-control {
        font-size: 14px;
    }
    
    .btn {
        padding: 12px 25px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .login-logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .login-logo i {
        font-size: 2rem;
    }
    
    .login-logo h1 {
        font-size: 1.3rem;
    }
    
    .login-subtitle {
        font-size: 0.9rem;
    }
}