/* softars.ru — personal site of Konstantin Gertsenberger. Plain CSS, no framework. */

:root {
    --bg: #ffffff;
    --bg-alt: #f4f6fa;
    --text: #1d2433;
    --muted: #5b6475;
    --line: #dde2ea;
    --accent: #1f4e8c;      /* deep blue, close to the JINR palette */
    --accent-soft: #e7eef9;
    --accent-dark: #163a68;
    --max: 1080px;
    --radius: 10px;
    --shadow: 0 2px 10px rgba(20, 30, 50, 0.08);
    font-size: 17px;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #12161d;
        --bg-alt: #1a2029;
        --text: #e6eaf0;
        --muted: #a3acbb;
        --line: #2b3340;
        --accent: #7fa8e0;
        --accent-soft: #1f2b3d;
        --accent-dark: #a9c5ec;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

/* Language switching: only the active language is shown */
html[data-lang="ru"] en, html[data-lang="ru"] [lang="en"] { display: none !important; }
html[data-lang="en"] ru, html[data-lang="en"] [lang="ru"] { display: none !important; }
ru, en { display: inline; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; font-weight: 650; margin: 0 0 0.5em; }
h1 { font-size: 2.1rem; }
h2 { font-size: 1.45rem; margin-top: 2.2rem; padding-bottom: 0.3rem; border-bottom: 2px solid var(--accent-soft); }
h3 { font-size: 1.12rem; margin-top: 1.4rem; }
p { margin: 0 0 1em; }
ul { padding-left: 1.3em; }
li { margin-bottom: 0.35em; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header {
    position: sticky; top: 0; z-index: 20;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
}
.site-header .container {
    display: flex; align-items: center; gap: 1rem; min-height: 64px; flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); white-space: nowrap; }
.brand small { display: block; font-weight: 400; font-size: 0.78rem; color: var(--muted); }
nav.main-nav { display: flex; gap: 0.15rem; flex-wrap: wrap; margin-left: auto; }
nav.main-nav a {
    padding: 0.45rem 0.7rem; border-radius: 6px; color: var(--text); font-size: 0.95rem;
}
nav.main-nav a:hover { background: var(--accent-soft); text-decoration: none; }
nav.main-nav a.active { background: var(--accent); color: #fff; }
.lang-switch {
    display: inline-flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; font-size: 0.85rem;
}
.lang-switch button {
    border: 0; background: transparent; color: var(--text); padding: 0.35rem 0.6rem; cursor: pointer; font: inherit;
}
.lang-switch button.active { background: var(--accent); color: #fff; }
.nav-toggle { display: none; border: 1px solid var(--line); background: transparent; color: var(--text); border-radius: 6px; padding: 0.3rem 0.6rem; font-size: 1.2rem; cursor: pointer; }

@media (max-width: 760px) {
    .nav-toggle { display: inline-block; margin-left: auto; }
    nav.main-nav { display: none; width: 100%; flex-direction: column; padding-bottom: 0.5rem; }
    nav.main-nav.open { display: flex; }
    .lang-switch { order: 3; }
}

/* Hero */
.hero {
    display: grid; grid-template-columns: 260px 1fr; gap: 2.5rem; align-items: start;
    padding: 2.5rem 0 1.5rem;
}
.hero img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow); }
.hero .lead { font-size: 1.15rem; color: var(--muted); margin-bottom: 1.2rem; }
.hero .tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0 1.2rem; }
.tag { background: var(--accent-soft); color: var(--accent-dark); border-radius: 999px; padding: 0.2rem 0.7rem; font-size: 0.85rem; }
@media (max-width: 700px) {
    .hero { grid-template-columns: 1fr; gap: 1.2rem; }
    .hero img { max-width: 240px; }
    h1 { font-size: 1.7rem; }
}

/* Stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.8rem; margin: 1.5rem 0; }
.stat { background: var(--bg-alt); border-radius: var(--radius); padding: 0.9rem 1rem; }
.stat b { display: block; font-size: 1.6rem; color: var(--accent); line-height: 1.1; }
.stat span { color: var(--muted); font-size: 0.9rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 1rem; }
.card {
    background: var(--bg-alt); border-radius: var(--radius); padding: 1.1rem 1.2rem; border: 1px solid transparent;
}
.card:hover { border-color: var(--line); }
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.card .meta { color: var(--muted); font-size: 0.88rem; }

/* Timeline (CV) */
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: grid; grid-template-columns: 150px 1fr; gap: 1rem; padding: 0.55rem 0; border-bottom: 1px dashed var(--line); margin: 0; }
.timeline li:last-child { border-bottom: 0; }
.timeline .when { color: var(--muted); font-variant-numeric: tabular-nums; }
@media (max-width: 560px) { .timeline li { grid-template-columns: 1fr; gap: 0.1rem; } }

/* Buttons */
.btn {
    display: inline-block; background: var(--accent); color: #fff; border-radius: 8px; padding: 0.55rem 1.1rem;
    font-weight: 600; border: 0; cursor: pointer; font: inherit;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }
.btn.secondary { background: var(--accent-soft); color: var(--accent-dark); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn:hover { color: #12161d; } }

/* Publications & talks */
.toolbar { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; margin: 1rem 0 1.5rem; }
.toolbar input[type="search"] {
    flex: 1 1 240px; padding: 0.5rem 0.7rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); font: inherit;
}
.toolbar select { padding: 0.5rem 0.6rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); font: inherit; }
.year-block h2 { margin-top: 1.6rem; }
ol.pubs { padding-left: 1.6em; }
ol.pubs li { margin-bottom: 0.7em; }
.pub-links { display: inline-flex; gap: 0.5rem; margin-left: 0.3rem; font-size: 0.85rem; white-space: nowrap; }
.pub-links a { border: 1px solid var(--line); border-radius: 5px; padding: 0 0.4rem; }
.badge { font-size: 0.75rem; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 0.3rem; margin-left: 0.3rem; vertical-align: middle; }
.count { color: var(--muted); font-size: 0.9rem; }
details summary { cursor: pointer; font-weight: 600; margin: 1rem 0 0.5rem; }

/* Gallery */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.8rem; }
.gallery figure { margin: 0; cursor: zoom-in; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: center 30%; border-radius: var(--radius); box-shadow: var(--shadow); display: block; }
.gallery figcaption { font-size: 0.88rem; color: var(--muted); margin-top: 0.35rem; }
.lightbox {
    position: fixed; inset: 0; background: rgba(0, 0, 0, 0.9); display: none; z-index: 50;
    align-items: center; justify-content: center; flex-direction: column; padding: 1rem;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 96vw; max-height: 84vh; border-radius: 6px; }
.lightbox figcaption { color: #eee; margin-top: 0.6rem; text-align: center; }
.lightbox button { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.15); color: #fff; border: 0; font-size: 2rem; width: 48px; height: 48px; border-radius: 50%; cursor: pointer; }
.lightbox .prev { left: 12px; }
.lightbox .next { right: 12px; }
.lightbox .close { top: 14px; right: 14px; transform: none; font-size: 1.4rem; }

/* Contact */
.contact-list { list-style: none; padding: 0; }
.contact-list li { display: flex; gap: 0.8rem; align-items: center; padding: 0.5rem 0; border-bottom: 1px dashed var(--line); }
.contact-list .ico { width: 36px; height: 36px; border-radius: 8px; background: var(--accent-soft); display: inline-flex; align-items: center; justify-content: center; flex: none; color: var(--accent-dark); font-weight: 700; font-size: 0.8rem; }
.contact-list .ico svg { width: 20px; height: 20px; fill: currentColor; }

/* Footer */
.site-footer { margin-top: 3rem; padding: 1.5rem 0 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.88rem; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }

main.container { padding-top: 1rem; padding-bottom: 2rem; }
.page-title { margin-top: 1.8rem; }
.note { color: var(--muted); font-size: 0.92rem; }

/* Print (used for "Save as PDF" of the CV page) */
@media print {
    .site-header, .site-footer, .no-print { display: none !important; }
    body { font-size: 11pt; color: #000; background: #fff; }
    a { color: #000; }
    .timeline li { break-inside: avoid; }
    h2 { border-color: #999; }
}

/* ---- Dark blue top: header and full-width title band with a subtle particle-track pattern ---- */
:root { --band-1: #14315c; --band-2: #1f4e8c; --band-text: #ffffff; --band-muted: rgba(255, 255, 255, 0.78); }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) { --band-1: #0d1b33; --band-2: #17365f; }
}
body { overflow-x: clip; }

.site-header { background: var(--band-1); border-bottom: 1px solid rgba(255, 255, 255, 0.12); }
.site-header .brand, .site-header nav.main-nav a, .site-header .lang-switch button, .site-header .nav-toggle { color: var(--band-text); }
.site-header .brand small { color: var(--band-muted); }
.site-header nav.main-nav a:hover { background: rgba(255, 255, 255, 0.12); }
.site-header nav.main-nav a.active { background: rgba(255, 255, 255, 0.2); color: #fff; }
.site-header .lang-switch, .site-header .nav-toggle { border-color: rgba(255, 255, 255, 0.35); }
.site-header .lang-switch button.active { background: #fff; color: var(--band-1); }

main.container { padding-top: 0; }
.hero, h1.page-title { position: relative; isolation: isolate; color: var(--band-text); }
.hero::before, h1.page-title::before {
    content: ""; position: absolute; top: 0; bottom: 0; left: 50%; width: 100vw; transform: translateX(-50%); z-index: -1;
    background: url("../img/tracks.svg") center / cover no-repeat, linear-gradient(120deg, var(--band-1), var(--band-2));
}
.hero { padding: 2.6rem 0 2.4rem; margin-bottom: 1.6rem; }
.hero .lead { color: var(--band-muted); }
.hero img { border: 3px solid rgba(255, 255, 255, 0.85); }
.hero .tag { background: rgba(255, 255, 255, 0.14); color: #fff; border: 1px solid rgba(255, 255, 255, 0.25); }
.hero .btn { background: #fff; color: var(--band-1); }
.hero .btn:hover { background: #e7eef9; color: var(--band-1); }
.hero .btn.secondary { background: transparent; color: #fff; border: 1px solid rgba(255, 255, 255, 0.6); }
.hero .btn.secondary:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
h1.page-title { margin: 0 0 1.6rem; padding: 2rem 0 1.8rem; }

@media print {
    .hero::before, h1.page-title::before { display: none; }
    .hero, h1.page-title { color: #000; padding: 0; }
}