* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 1.5rem;
    color: #667eea;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.main {
    flex: 1;
    padding: 30px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.section {
    width: 100%;
    max-width: 500px;
}

.login-box {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.login-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: #f0f0f0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input[type="email"],
.form-group input[type="text"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    min-height: 80px;
    resize: vertical;
}

.code-input-group {
    display: flex;
    gap: 10px;
}

.code-input-group input {
    flex: 1;
}

.code-input-group button {
    white-space: nowrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-outline {
    background: transparent;
    border: 1px solid #667eea;
    color: #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-block {
    width: 100%;
}

.wechat-qr {
    text-align: center;
    padding: 30px;
}

.wechat-qr p {
    margin-top: 15px;
    color: #666;
}

.profile-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.95);
    padding: 10px;
    border-radius: 10px;
}

#profileSection .profile-tabs .tab-btn {
    flex: 1;
}

.upload-box {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.upload-box h3 {
    margin-bottom: 20px;
    color: #333;
}

.profile-list {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.profile-list h3 {
    margin-bottom: 20px;
    color: #333;
}

.profile-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 10px;
}

.profile-info {
    flex: 1;
}

.profile-name {
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.profile-meta {
    font-size: 12px;
    color: #999;
}

.profile-actions {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 8px 15px;
    font-size: 12px;
}

.btn-download {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.btn-delete {
    background: #dc3545;
    color: white;
}

.btn-set-admin {
    background: #ffc107;
    color: #333;
}

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

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: #28a745;
}

.toast.error {
    background: #dc3545;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: #999;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }

    .main {
        padding: 15px;
    }

    .login-box {
        padding: 25px;
    }

    .login-tabs {
        flex-direction: column;
    }

    .profile-tabs {
        flex-direction: column;
    }

    .profile-item {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .profile-actions {
        width: 100%;
    }

    .profile-actions .btn {
        flex: 1;
    }
}