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

:root {
    color-scheme: light;
    --background: #ffffff;
    --text: #1a1a1a;
    --border: #dddddd;
    --control-background: #e4e4e4;
    --control-hover: #c7c7c7;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --background: #17191c;
    --text: #eeeeee;
    --border: #3a3f45;
    --control-background: #30353b;
    --control-hover: #454c54;
}

body {
    font-family: system-ui, sans-serif;
    color: var(--text);
    background-color: var(--background);
    line-height: 1.6;
    transition: background-color 0.2s ease, color 0.2s ease;
}

header {
    position: relative;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
}

blockquote {
    border-left: 4px solid var(--border);
    padding-left: 12px;
    margin: 16px 0;
    color: var(--text);
    opacity: 0.8;
}

.logo-link {
    display: inline-block;
}

.header-nav a {
    text-decoration: none;
    color: var(--text);
    font-size: 15px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 1;
}

.menu-toggle {
    display: none;
}

.header-nav a:hover {
    text-decoration: underline;
}

.logo {
    height: 40px;
    width: auto;
    display: block;
}

.search-button {
    background-color: var(--control-background);
    color: var(--text);
    padding: 2px 5px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-button:hover {
    background-color: var(--control-hover);
}

.theme-toggle {
    margin-left: auto;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--control-background);
    color: var(--text);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0;
}

.search-form {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle:hover {
    background: var(--control-hover);
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 24px;
}

main img {
    max-width: 100%;
    height: auto;
}

@media (max-width: 600px) {
    header {
        padding: 10px 16px;
    }

    .header-nav {
        display: none;
        position: absolute;
        z-index: 10;
        top: calc(100% + 1px);
        right: 16px;
        left: 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 16px;
        border: 1px solid var(--border);
        background: var(--background);
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    }

    .header-nav.is-open {
        display: flex;
    }

    .search-form {
        position: static;
        transform: none;
        width: 100%;
    }

    .search-form input {
        min-width: 0;
        flex: 1;
    }

    .theme-toggle {
        margin-left: auto;
    }

    .menu-toggle {
        display: block;
        width: 36px;
        height: 36px;
        margin-left: 8px;
        border: 1px solid var(--border);
        border-radius: 4px;
        background: var(--control-background);
        color: var(--text);
        cursor: pointer;
        font-size: 18px;
        line-height: 1;
    }

    main {
        width: 100%;
        max-width: none;
        padding: 24px 16px;
    }
}