/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4A90E2;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--light-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-link {
    color: var(--dark-text);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: var(--light-bg);
}

/* 用户信息 */
.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.9rem;
}

.user-email {
    color: var(--secondary-color);
}

.user-balance {
    background-color: var(--success-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
}

/* 用户下拉菜单 */
.user-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.dropdown-toggle:hover {
    background-color: var(--light-bg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: var(--shadow);
    min-width: 180px;
    z-index: 1001;
}

.dropdown-item {
    display: block;
    padding: 10px 16px;
    color: var(--dark-text);
    text-decoration: none;
    transition: background-color 0.2s;
}

.dropdown-item:hover {
    background-color: var(--light-bg);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* 主内容区 */
.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 120px);
}

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

.tool-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.tool-description {
    font-size: 1.1rem;
    color: var(--secondary-color);
}

/* 登录提示 */
.login-prompt {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 0;
}

.prompt-card {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 400px;
}

.prompt-card h2 {
    margin-bottom: 15px;
    color: var(--dark-text);
}

.prompt-card p {
    margin-bottom: 25px;
    color: var(--secondary-color);
}

/* 工具界面 */
.tool-interface {
    display: grid;
    gap: 20px;
}

.tool-card, .stats-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.tool-card h2, .stats-card h3 {
    margin-bottom: 15px;
    color: var(--dark-text);
}

.tool-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.tool-result {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.result-content {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 4px;
    margin-top: 15px;
    font-family: monospace;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* 按钮 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: #357abd;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 页脚 */
.footer {
    background-color: white;
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
    }

    .user-info {
        flex-direction: column;
        gap: 8px;
    }

    .tool-header h1 {
        font-size: 2rem;
    }

    .tool-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}