:root {
    --color-primary: #1a73e8;
    --color-background: #ffffff;
    --color-text: #202124;
    --color-secondary-text: #5f6368;
    --color-separator: #dadce0;
    --color-hover-bg: #f8f9fa;

    --font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-base: 16px;
    --border-radius: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0;
    padding: 40px 20px;
    background-color: var(--color-background);
    color: var(--color-text);
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    font-size: 2.2em;
    font-weight: 300;
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-separator);
}

h2 {
    font-size: 1.5em;
    font-weight: 500;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--color-primary);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-separator);
}

.tool-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.tool-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    margin-bottom: 12px;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-separator);
    transition: all 0.2s ease;
    cursor: pointer;
    background-color: #fff;
}

.tool-item:hover {
    background-color: var(--color-hover-bg);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.tool-info {
    flex-grow: 1;
    margin-right: 20px;
}

.tool-name {
    font-size: 1.05em;
    font-weight: 600;
    margin-bottom: 4px;
}

.tool-description {
    font-size: 0.9em;
    color: var(--color-secondary-text);
}

.tool-link a {
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 500;
}

.tool-item:hover .tool-link a {
    text-decoration: underline;
}

/* TOC */
.toc {
    position: fixed;
    top: 100px;
    right: 20px;
    width: 200px;
    max-height: 70vh;
    overflow-y: auto;
    background: #fff;
    border: 1px solid var(--color-separator);
    border-radius: var(--border-radius);
    padding: 12px;
    font-size: 14px;
}

.toc-title {
    font-weight: 600;
    margin-bottom: 8px;
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc li {
    margin-bottom: 6px;
}

.toc a {
    text-decoration: none;
    color: var(--color-secondary-text);
}

.toc a:hover {
    color: var(--color-primary);
}

@media (max-width: 900px) {
    .toc {
        display: none;
    }
}