html {
    scroll-behavior: smooth;
}

body {
    font-family: arial, sans-serif;
    margin: 0;
}

:root {
    --maincolor: SteelBlue;
}

.main {
    margin: auto;
    max-width: 50rem;
    padding: 2rem 1rem 0 1rem;
}

.main a {
    text-decoration: none;
    color: var(--maincolor);
}

.main a:hover {
    text-decoration: underline;
}

h1 {
    margin-bottom: 0.2rem;
}

.subtitle {
    color: #555;
    font-size: 1.1rem;
    margin-top: 0;
}

.info {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

h3 {
    margin-top: 2.5rem;
}

hr.top-bar {
    border: 1rem solid var(--maincolor);
    margin: auto;
    max-width: 48rem;
}

hr.normal {
    margin-top: 0;
    margin-bottom: 1rem;
    border: 1px solid var(--maincolor);
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.92rem;
    margin-top: 0.5rem;
}

th, td {
    text-align: left;
    padding: 0.45rem 0.6rem;
    border-bottom: 1px solid #ddd;
}

th {
    font-weight: bold;
    border-bottom: 2px solid var(--maincolor);
}

tr.block-header td {
    font-weight: bold;
    font-size: 1.05rem;
    color: var(--maincolor);
    padding-top: 1.2rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--maincolor);
}

tr.block-sep td {
    border-top: 1px solid #ddd;
}

tr.standalone td {
    background: #ffbb4e;
}

tr.spacer td {
    border: none;
    height: 1.2rem;
    padding: 0;
}

.session-num {
    font-weight: bold;
    color: var(--maincolor);
    white-space: nowrap;
}

.topic {
    width: 100%;
}

.materials a {
    margin-right: 0.6rem;
    font-size: 0.85rem;
}

.tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.1rem 0.4rem;
    border-radius: 0.25rem;
    margin-left: 0.3rem;
    vertical-align: middle;
}

.tag-lecture {
    background: #e8daf5;
    color: #6c3483;
}

.tag-quiz {
    background: #fdebd0;
    color: #b9770e;
}

.tag-exercises {
    background: #d6eaf8;
    color: #1a5276;
}

.tag-solutions {
    background: #d5f5e3;
    color: #1e8449;
}

.tag-code {
    background: #fadbd8;
    color: #922b21;
}

.tag-reading {
    background: #f5eef8;
    color: #7d3c98;
}

.tag-tba {
    background: #eee;
    color: #888;
}

.quote {
    text-align: center;
    font-size: 0.9rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
}

.session-past {
    color: #333;
}

.session-future {
    color: #999;
}