:root {
    --body-bg: #FDFCFB;
    --header-color: #1E1E1E;
    --body-color: #333;
    --link: blue;
    --selection: blue;
    --accent: #00DAC6;
    --accent2: #BB86FC;
    --border: #e0e0e0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --body-bg: #1E1E1E;
        --body-color: #c2c1c1;
        --header-color: #FDFCFB;
        --link: #00DAC6;
        --selection: #BB86FC;
        --border: #333;
    }
}

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

body {
    background-color: var(--body-bg);
    font-family: monospace;
    color: var(--body-color);
    max-width: 86ch;
    margin: 8px auto;
    padding: 32px;
    line-height: 1.5em;
}

a, a:link, a:visited {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    border-bottom: 1px solid #5aa8c8;
}

h1, h2, h3 {
    color: var(--header-color);
    font-weight: normal;
    margin-bottom: 0.75em;
    margin-top: 1.25em;
}

h1 { font-size: 1.6em; }
h2 { font-size: 1.2em; color: var(--accent2); }
h3 { font-size: 1em; color: var(--accent); }

h2.dimmed { opacity: 0.3; }

::selection {
    background: var(--selection);
}

h2::selection,
th::selection,
.entry-subject::selection,
.subject-btn::selection {
    background: var(--accent2);
    color: #fff;
}

/* Navigation */
nav {
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
    margin-bottom: 24px;
}

nav a {
    margin-right: 16px;
    font-size: 0.9em;
}

nav a.active {
    border-bottom: 2px solid var(--accent);
    color: var(--accent);
}

/* Search */
.search-container {
    margin: 16px 0 24px 0;
}

.search-container input {
    width: 100%;
    padding: 8px 12px;
    font-family: monospace;
    font-size: 0.95em;
    background-color: var(--body-bg);
    color: var(--body-color);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    outline: none;
}

.search-container input:focus {
    border-left: 3px solid var(--accent2);
}

/* Subject grid */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.subject-card {
    border-left: 3px solid var(--accent);
    padding: 10px 14px;
    background: transparent;
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: border-left-color 0.15s;
}

.subject-card:hover {
    border-left-color: var(--accent2);
}

.subject-card h3 {
    margin: 0 0 4px 0;
    font-size: 0.95em;
}

.subject-card p {
    font-size: 0.8em;
    opacity: 0.7;
    margin: 0;
}

/* Entry / definition blocks */
.entry {
    border-left: 3px solid var(--accent);
    padding: 10px 14px;
    margin: 10px 0;
    background: transparent;
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.entry.hidden {
    display: none;
}

.entry.dimmed {
    opacity: 0.35;
    border-left-color: var(--border);
}

.entry-title {
    font-weight: bold;
    color: var(--header-color);
    margin-bottom: 4px;
}

.entry-tags {
    font-size: 0.78em;
    color: var(--accent);
    margin-bottom: 6px;
}

.entry-body {
    font-size: 0.9em;
    line-height: 1.6em;
}

.entry-body ul {
    padding-left: 1.5em;
}

.entry-body code {
    background: var(--border);
    padding: 1px 5px;
    font-family: monospace;
    font-size: 0.9em;
}

/* Formula blocks */
.formula {
    border-left: 3px solid var(--accent2);
    padding: 8px 14px;
    margin: 8px 0;
    font-style: italic;
    font-size: 0.95em;
}

/* Tag filter */
.subject-filter {
    margin: 16px 0 4px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.subject-btn {
    font-size: 0.85em;
    padding: 5px 14px;
    border: 1px solid var(--accent2);
    color: var(--accent2);
    cursor: pointer;
    background: transparent;
    font-family: monospace;
}

.subject-btn.active, .subject-btn:hover {
    background: var(--accent2);
    color: var(--body-bg);
}

.entry-subject {
    float: right;
    font-size: 0.85em;
    color: var(--accent2);
    opacity: 0.7;
}

.tag-filter {
    margin: 12px 0 20px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    font-size: 0.78em;
    padding: 3px 10px;
    border: 1px solid var(--accent);
    color: var(--accent);
    cursor: pointer;
    background: transparent;
    font-family: monospace;
}

.tag.active, .tag:hover {
    background: var(--accent);
    color: var(--body-bg);
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.82em;
    margin-bottom: 20px;
    opacity: 0.7;
}

.breadcrumb a {
    color: var(--accent);
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
    margin: 16px 0;
}

th {
    text-align: left;
    border-bottom: 2px solid var(--accent);
    padding: 6px 8px;
    color: var(--accent2);
    font-weight: normal;
}

td {
    padding: 6px 8px
    border-bottom: 1px solid var(--border);
}

tr:hover td {
    border-left: 2px solid var(--accent);
}

/* Download button */
.download-btn {
    display: inline-block;
    margin-top: 14px;
    padding: 5px 14px;
    font-size: 0.82em;
    font-family: monospace;
    border: 1px solid var(--accent);
    color: var(--accent);
    text-decoration: none;
    background: transparent;
    cursor: pointer;
}

.download-btn:hover {
    background: var(--accent);
    color: var(--body-bg);
}

/* Footer */
footer {
    margin-top: 48px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 0.8em;
    opacity: 0.6;
}

/* CV floating button */
.cv-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--body-bg);
    border: 2px solid var(--accent);
    color: var(--accent);
    text-decoration: none;
    font-family: monospace;
    line-height: 1.1;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
    box-shadow: 0 0 0 0 var(--accent);
    z-index: 999;
}

.cv-btn:hover {
    background: var(--accent);
    color: var(--body-bg);
    border-color: var(--accent);
    border-bottom: 2px solid var(--accent);
    box-shadow: 0 0 18px 2px var(--accent);
}

.cv-btn-label {
    font-size: 1.1em;
    font-weight: bold;
    letter-spacing: 0.05em;
}

.cv-btn-sub {
    font-size: 0.45em;
    opacity: 0.75;
    letter-spacing: 0.02em;
}

@media screen and (max-width: 600px) {
    body {
        padding: 16px;
    }
    .subject-grid {
        grid-template-columns: 1fr;
    }
}