/* Systems Engineering Design @ Chalmers — shared site chrome
   Built on the Chalmers Design System (ds/colors_and_type.css). */

/* ─── Page shell ─────────────────────────────────────────── */
.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
}
.container {
    width: min(1200px, 100% - 80px);
    margin: 0 auto;
}
main { flex: 1 1 auto; }

/* ─── Topbar (purple utility strip) ──────────────────────── */
.topbar {
    background: var(--c-purple);
    color: var(--c-white);
    font-size: 12px;
    padding: 7px 40px;
    display: flex;
    justify-content: space-between;
    gap: 22px;
}
.topbar-group { display: flex; gap: 22px; }
.topbar a {
    color: var(--c-white);
    text-decoration: none;
}
.topbar a:hover { color: var(--c-white); text-decoration: underline; text-underline-offset: 3px; }
.topbar .ext {
    display: inline-flex;
    width: 12px;
    height: 12px;
    margin-left: 2px;
    vertical-align: -1px;
    opacity: 0.8;
}
.topbar .ext svg { width: 100%; height: 100%; }

/* ─── Masthead (sticky; compacts on scroll) ──────────────── */
.masthead {
    background: var(--c-white);
    border-bottom: 1px solid var(--border);
    padding: 16px 40px;
    display: flex;
    align-items: center;
    gap: 40px;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: padding 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.masthead.is-compact { padding-top: 8px; padding-bottom: 8px; }
.wordmark {
    text-decoration: none;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 13px;
}
.wordmark .wm-logo {
    height: 26px;
    width: auto;
    display: block;
    transition: height 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.wordmark .wm-sed {
    font-weight: var(--fw-bold);
    font-size: 19px;
    letter-spacing: 0.01em;
    color: var(--c-purple-dark);
    line-height: 1;
    padding-left: 13px;
    border-left: 1px solid var(--border-strong);
    transition: font-size 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.masthead.is-compact .wm-logo { display: none; }
.masthead.is-compact .wm-sed {
    padding-left: 0;
    border-left: none;
    font-size: 17px;
}
.site-nav {
    display: flex;
    gap: 26px;
    margin-left: auto;
}
.site-nav a {
    color: var(--fg);
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 600;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--c-purple); }
.site-nav a[aria-current="page"] {
    color: var(--c-purple-dark);
    border-bottom-color: var(--c-purple);
}

/* ─── Page intro band ────────────────────────────────────── */
.page-intro {
    padding: 56px 0 40px;
}
.page-intro .eyebrow { color: var(--c-purple-dark); margin-bottom: 12px; }
.page-intro h1 { max-width: 18ch; }
.page-intro .lead { max-width: 30em; margin: 12px 0 0; color: var(--fg); }

/* ─── Sections ───────────────────────────────────────────── */
.section { padding: 56px 0; }
.section.is-beige { background: var(--c-beige); }
.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
}
.section-head h2 { margin: 0; }
.section-head .all-link {
    font-size: 13.5px;
    font-weight: 600;
    white-space: nowrap;
}

/* ─── Cards ──────────────────────────────────────────────── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.card {
    background: var(--c-white);
    border: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
a.card { text-decoration: none; color: var(--fg); }
a.card:hover { border-color: var(--c-purple); color: var(--fg); }
.card h3 { margin: 0; font-size: 19px; }
.card p { margin: 0; font-size: 14px; line-height: 1.55; color: var(--fg-muted); }
.card .card-cta {
    margin-top: auto;
    padding-top: 12px;
    font-size: 13px;
    font-weight: 700;
    color: var(--c-purple-dark);
}

/* Purple promo card */
.card.is-purple {
    background: var(--c-purple);
    border-color: var(--c-purple);
    color: var(--c-white);
    position: relative;
    overflow: hidden;
}
.card.is-purple h3, .card.is-purple p { color: var(--c-white); }
.card.is-purple p { color: rgba(255,255,255,0.85); }
.card.is-purple::after {
    /* Avancez corner cut */
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    height: 33%;
    aspect-ratio: 0.4877;
    background: var(--c-purple-light);
    clip-path: polygon(100% 0, 100% 100%, 0 100%);
    pointer-events: none;
}

/* ─── Photo placeholder (striped, labelled) ──────────────── */
.ph {
    position: relative;
    background: repeating-linear-gradient(45deg, #E9E6DF 0 10px, #F3F1EB 10px 20px);
    overflow: hidden;
    display: block;
}
.ph .ph-label {
    position: absolute;
    left: 8px;
    bottom: 6px;
    font-family: "JetBrains Mono", Consolas, monospace;
    font-size: 10px;
    color: #8A8780;
    letter-spacing: 0.02em;
    background: none;
    padding: 0;
}

/* ─── Key facts strip ────────────────────────────────────── */
.facts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    border-top: 1px solid var(--border-strong);
}
.fact { padding-top: 16px; }
.fact .fact-n {
    font-weight: var(--fw-bold);
    font-size: 40px;
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--c-purple-dark);
}
.fact .fact-label {
    font-size: 13px;
    color: var(--fg-muted);
    margin-top: 4px;
}

/* ─── News cards ─────────────────────────────────────────── */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.news-card { text-decoration: none; color: var(--fg); display: block; }
.news-card:hover { color: var(--fg); }
.news-card .news-photo { position: relative; height: 180px; }
.news-card .news-chip {
    position: absolute;
    left: 0;
    top: 10px;
    padding: 4px 8px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--c-white);
    color: var(--c-black);
}
.news-card .news-date {
    font-size: 12px;
    color: var(--fg-subtle);
    margin: 12px 0 4px;
}
.news-card h3 {
    font-size: 17px;
    line-height: 1.3;
    margin: 0;
}
.news-card:hover h3 { color: var(--c-purple-dark); text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 900px) { .news-grid { grid-template-columns: 1fr; } }

/* ─── Upcoming events (Chalmers newsletter pattern) ──────── */
.section.is-purple { background: var(--c-purple); }
.section.is-purple .section-head h2 { color: var(--c-white); }
.section.is-purple .all-link { color: var(--c-white); }
.section.is-purple .all-link:hover { color: var(--c-white); }

.event-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.event-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.event-card {
    background: var(--c-white);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--fg);
}
a.event-card:hover { color: var(--fg); }
a.event-card:hover .event-title { color: var(--c-purple-dark); text-decoration: underline; text-underline-offset: 3px; }
.event-bar {
    background: var(--c-black);
    color: var(--c-white);
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 18px;
    font-weight: var(--fw-bold);
    font-size: 15px;
    letter-spacing: 0.01em;
    white-space: nowrap;
}
.event-body { padding: 18px 18px 22px; flex: 1 1 auto; display: flex; flex-direction: column; }
.event-type {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--c-purple-dark);
    margin-bottom: 8px;
}
.event-title { font-size: 17px; line-height: 1.3; margin: 0 0 8px; max-width: none; }
.event-loc { font-size: 13px; line-height: 1.45; color: var(--fg-muted); margin: 0; max-width: none; }

/* Detailed variant — News & Events page */
.event-card.is-detailed .event-bar { font-size: 17px; padding: 12px 24px; }
.event-card.is-detailed .event-body {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 16px 48px;
    padding: 24px 24px 28px;
}
.event-card.is-detailed .event-title { font-size: 21px; }
.event-card.is-detailed .event-loc { font-size: 13.5px; }
.event-main { display: flex; flex-direction: column; align-items: flex-start; }
.event-btn { margin-top: 20px; }
.event-desc {
    font-family: var(--font-serif);
    font-size: 15.5px;
    line-height: 1.55;
    color: var(--fg);
    margin: 0;
    max-width: 55ch;
}
.event-empty {
    color: var(--c-white);
    font-family: var(--font-serif);
    font-size: 16px;
    margin: 0;
}
@media (max-width: 900px) {
    .event-grid { grid-template-columns: 1fr; }
    .event-card.is-detailed .event-body { grid-template-columns: 1fr; }
    .event-bar { white-space: normal; }
}

/* ─── Footer ─────────────────────────────────────────────── */
.site-footer {
    background: var(--c-black);
    color: var(--c-white);
    margin-top: 64px;
    padding: 48px 40px 32px;
}
.site-footer .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    max-width: 1200px;
    margin: 0 auto;
}
.site-footer h4 {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.6);
    margin: 0 0 12px;
}
.site-footer p { color: rgba(255,255,255,0.8); font-size: 13.5px; margin: 0 0 8px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.site-footer a { color: var(--c-white); font-size: 13.5px; text-decoration: none; }
.site-footer a:hover { color: var(--c-purple-light); text-decoration: underline; text-underline-offset: 3px; }
.site-footer .footer-mark {
    max-width: 1200px;
    margin: 40px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--border-invert);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
}
.site-footer .footer-mark .footer-logo {
    height: 24px;
    width: auto;
    display: block;
}
.site-footer .footer-mark .legal {
    font-size: 12px;
    color: rgba(255,255,255,0.55);
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
    .container { width: calc(100% - 48px); }
    .masthead { padding: 14px 24px; gap: 20px; flex-wrap: wrap; }
    .site-nav { gap: 18px; margin-left: 0; flex-wrap: wrap; }
    .topbar { padding: 7px 24px; }
    .card-grid { grid-template-columns: 1fr; }
    .facts { grid-template-columns: repeat(2, 1fr); }
    .site-footer .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}