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


:root {
    --bg: #f0f0f0;
    --card: #ffffff;
    --text: #444444;
    --border: #e0e0e0;
    --shadow: rgba(0, 0, 0, .08);
    --shadow-hover: rgba(0, 0, 0, .12);
    --muted: #666666;
    --badge-bg: #f8f8f8;
}

body.dark {
    --bg: #1e1e1e;
    --card: #2a2a2a;
    --text: #e0e0e0;
    --border: #333333;
    --shadow: rgba(0, 0, 0, .4);
    --shadow-hover: rgba(0, 0, 0, .6);
    --muted: #aaaaaa;
    --badge-bg: #2b2b2b;
}


body {
    font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 0 1.5rem;
}

header {
    background-color: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
}

.header-content {
    display: flex;
    align-items: center;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--text);
    letter-spacing: 1px;
}

main {
    flex: 1;
    padding: 3rem 0;
}

.page-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}


.link-card {
    background: var(--card);
    border-radius: 4px;
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow);
    transition: transform .25s ease, box-shadow .25s ease;
    border: 1px solid var(--border);
    display: block;
    text-decoration: none;
    color: inherit;
    height: 100%;
}


.link-card:hover {
    box-shadow: 0 6px 16px var(--shadow-hover);
    transform: translateY(-3px);
}

.link-title {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text);
    font-weight: 500;
}

.link-description {
    color: var(--muted);
    margin-bottom: 1.5rem;
}

.link-url {
    display: inline-block;
    background: var(--badge-bg);
    padding: 0.5rem 1rem;
    border-radius: 3px;
    color: var(--text);
    font-size: 0.9rem;
    word-break: break-all;
    border: 1px solid var(--border);
    transition: background-color .35s ease, color .35s ease, border-color .35s ease;
}

footer {
    background: var(--card);
    color: var(--muted);
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.icp {
    color: var(--muted);
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .page-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    header {
        padding: 1.2rem 0;
    }

    .site-title {
        font-size: 1.5rem;
    }

    main {
        padding: 2rem 0;
    }

    .link-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.8rem;
    }

    .link-card {
        padding: 1.2rem;
    }

    .link-title {
        font-size: 1.3rem;
    }
}


body,
.link-card,
header,
footer {
    transition: background-color .35s ease, color .35s ease, border-color .35s ease, box-shadow .25s ease;
}


header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#themeToggle {
    width: 28px;
    height: 28px;
    cursor: pointer;
    border: none;
    background: url(darkness.png) center/contain no-repeat;
    transition: transform .2s ease, filter .2s ease, background-color .2s ease;
    background-color: transparent;
    filter: none;
    border-radius: 4px;
}


body.dark #themeToggle {
    filter: invert(1) brightness(1.15);
}


#themeToggle:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(100, 150, 255, 0.18);
}

#themeToggle:hover {
    transform: scale(1.15);
}