* { box-sizing: border-box; }

:root {
    --bg-color: #f4f4f0;
    --text-color: #363737;
    --border-color: #ccc;
    --font-serif: "Spectral", Georgia, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

h1, h2 {
    font-family: var(--font-sans), serif;
}

html {
    scrollbar-gutter: stable;
}

html, body {
    height: 100%;
    margin: 0;
    font-size: 18px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-serif), serif;
    line-height: 1.6;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-container {
    max-width: 800px;
    width: 90%;
    padding: 20px;
    flex: 1;
    position: relative;
}

h1 {
    text-align: center;
    margin-top: 40px;
    margin-bottom: 40px;
    font-size: 2.5rem;
}

h2 {
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    padding-bottom: 5px;
    letter-spacing: 1px;
}

.main-container ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.main-container li { margin-bottom: 1rem; }

a {
    color: var(--text-color);
    text-decoration: underline;
    font-weight: bold;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

footer {
    padding: 30px 20px;
    border-top: 1px solid var(--border-color);
    width: 100%;
    font-size: 0.9rem;
}

footer p {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-left {
    flex: 1;
    text-align: right;
    padding-right: 15px;
}

.footer-right {
    flex: 1;
    text-align: left;
    padding-left: 15px;
}

.footer-separator {
    opacity: 0.5;
}

@media (max-width: 768px) {
    footer p {
        flex-direction: column;
        gap: 10px;
    }
    .footer-left, .footer-right {
        text-align: center;
        padding: 0;
    }
    .footer-separator {
        display: none;
    }
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background-color: #d1d1cd;
    border-radius: 20px;
    border: 3px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
    background-color: #bbb;
}

* {
    scrollbar-width: thin;
    scrollbar-color: #d1d1cd var(--bg-color);
}

.back-link-top {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 0.85rem;
    text-decoration: none;
    font-weight: bold;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.back-link-top:hover {
    opacity: 1;
}

@media (max-width: 768px) {
    .back-link-top {
        position: static;
        display: block;
        margin-top: 10px;
        margin-bottom: 20px;
        text-align: left;
    }
}