:root {
    --bg: #5E4C93;
    --bg2: #1b162a;
    --text: #FFFFFF;
    --surface: #3e3261;
    --muted: #C5C1D1;
    --border: #20192a;
    --serif: 'Instrument Serif', Georgia, serif;
    --sans: 'DM Sans', system-ui, sans-serif;
    --nav-w: 230px;
    --font-size: 18px;
    --margin-main-content: 100px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #5E4C93;
        --bg2: #1b162a;
        --text: #FFFFFF;
        --surface: #3e3261;
        --muted: #C5C1D1;
        --border: #20192a;
    }
}

html {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(135deg, var(--bg), var(--bg2));
    margin: 0;
}

p,
span,
li {
    color: var(--muted);
    line-height: 1.7;
    font-size: var(--font-size);
}

h1,
h2,
h3,
a {
    color: var(--text);
}

* {
    box-sizing: border-box;
}

.sidebar {
    background-color: var(--bg);
    margin-top: 0;
    position: fixed;
    top: 0;
    left: 0;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 230px;
}

.lang-dropdown {
    display: flex;
    gap: 3px;
    margin-top: 10px;
    width: 91px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: none;
    background: none;
    margin-bottom: 10px;
}

.lang-dropdown.show-border {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg2);
}

.lang-menu {
    display: flex;
    align-items: center;
    gap: 3px;
}

.lang-item {
    cursor: pointer;
    background-color: var(--surface);
    width: 40px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--muted);
}

.lang-item:hover {
    border-color: var(--text);
    color: var(--text);
}

#lang-button {
    width: 40px;
    height: 30px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;

    cursor: pointer;
    background-color: var(--surface);
    color: var(--muted);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 3px 6px;

    font-size: 14px;
}

#lang-button:hover {
    border-color: var(--text);
    color: var(--text);
}

option {
    border: 1px solid var(--border);
    border-radius: 8px;
}

#sidebar-top {
    padding: 36px 32px 20px;
    border-bottom: 1px solid var(--border);
}

#sidebar-top-content {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

#sidebar-top-content p {
    margin: 0;
    pad: 0;
    font-size: 13px;
}

#navbar {
    padding: 36px 1px 28px 32px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    list-style: none;
}

.navbar-group {
    margin-top: 10px;
}

.nav-link {
    position: relative;
    text-decoration: none;
    color: var(--muted);
    font-size: 13px;
}

.nav-link:hover {
    color: var(--text);
}

.nav-link.active {
    color: var(--text);
    font-weight: bold;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: -32px;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    background: var(--text);
    border-radius: 0 2px 2px 0;
    transition: height 0.18s;
}

.nav-link.active::before {
    height: 14px;
}

.nav-link .idx {
    color: var(--muted);
    font-weight: normal;
    font-size: 13px;
}

.sidebar-bottom-margin {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#sidebar-bottom {
    padding: 36px 32px 28px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

#sidebar-bottom a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.84rem
}

.main-content {
    margin-left: 230px;
}

#introduction {
    padding-top: 100px;
    margin-left: var(--margin-main-content);
    margin-bottom: 60px;
    margin-right: var(--margin-main-content);
}

#introduction p {
    color: var(--text);
}

.text-link.introduction {
    margin-top: 20px;
}

.project-section {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.content-block {
    height: 600px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
}

.section-header {
    margin: 80px;
    margin-left: var(--margin-main-content);
    margin-right: var(--margin-main-content);
}

.tags {
    margin-top: 30px;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.tag {
    color: var(--muted);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 3px 10px;
    border-radius: 3px;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.block-image {
    overflow: hidden;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    display: flex;
}

.block-image.right {
    margin-right: var(--margin-main-content);
    border-left: 1px solid var(--border);
    justify-content: left;
}

.block-image.left {
    margin-left: var(--margin-main-content);
    border-right: 1px solid var(--border);
    justify-content: right;
}

.block-image img {
    height: 100%;
    width: 100%;
    max-width: 700px;
    max-height: 700px;
    object-fit: cover;
}

.block-image img.left {
    object-position: left;
}

.block-image img.center {
    object-position: center;
}

.block-image img.right {
    object-position: right;
}

.block-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    margin-right: var(--margin-main-content);
    padding-left: var(--margin-main-content);
}

.text-content {
    display: inline;
}

.text-content a {
    font-size: var(--font-size);
    font-weight: normal;
}

.text-link:hover {
    border-color: var(--text);
}

.text-link {
    display: inline-block;
    width: fit-content;
    font-size: 0.90rem;
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 2px;
    transition: border-color 0.15s;
    white-space: nowrap;
}

.link-row {
    margin: var(--margin-main-content);
    margin-top: 30px;
}

.hidden {
    display: none;
}