/* ===== Design-Tokens (Dark Mode ist Standard) ===== */
:root {
    --bg: #0b0d10;
    --bg-elev: #11151a;
    --bg-card: #151a21;
    --border: #232a33;
    --text: #e8ecf1;
    --muted: #9aa6b2;
    --accent: #ff8a3d;
    --accent-ink: #1a0e05;
    --accent-2: #35d0e6;
    --radius: 14px;
    --maxw: 1180px;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color-scheme: dark;
}
[data-theme="light"] {
    --bg: #f6f7f9;
    --bg-elev: #ffffff;
    --bg-card: #ffffff;
    --border: #dde2e8;
    --text: #14181d;
    --muted: #566270;
    --accent: #a8480a;
    --accent-ink: #ffffff;
    --accent-2: #076c7d;
    --shadow: 0 8px 24px rgba(20, 24, 29, .08);
    color-scheme: light;
}

/* ===== Basis ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0; background: var(--bg); color: var(--text);
    font: 1rem/1.65 var(--font); min-height: 100vh;
    display: flex; flex-direction: column;
}
main { flex: 1; }
main:focus { outline: none; }
img, svg { max-width: 100%; display: block; }
a { color: var(--accent-2); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.01em; margin: 0 0 .6em; }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.muted { color: var(--muted); }
.center { text-align: center; }
.plain { padding-block: 6rem; }
.container { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 3px; border-radius: 4px; }
.skip-link {
    position: absolute; left: .75rem; top: -4rem; z-index: 100; padding: .6rem 1rem;
    background: var(--accent); color: var(--accent-ink); border-radius: 8px; text-decoration: none; font-weight: 600;
}
.skip-link:focus { top: .75rem; }
.icon { width: 1.25em; height: 1.25em; flex: none; }

/* ===== Header / Navigation ===== */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.site-header__bar { display: flex; align-items: center; gap: 1rem; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--text); text-decoration: none; font-weight: 700; }
.brand__mark {
    width: 1.1rem; height: 1.1rem; border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--accent-2), var(--accent));
    box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 60%, transparent);
}
.nav { margin-left: auto; }
.nav__list { display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.nav__link {
    display: block; padding: .5rem .8rem; border-radius: 999px; color: var(--muted);
    text-decoration: none; font-size: .95rem; transition: color .2s, background-color .2s;
}
.nav__link:hover { color: var(--text); background: var(--bg-card); }
.nav__link[aria-current="page"] { color: var(--text); background: var(--bg-card); box-shadow: inset 0 -2px 0 var(--accent); }
.site-header__actions { display: flex; gap: .4rem; }
.icon-btn {
    display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 12px;
    border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); cursor: pointer;
}
.icon-btn:hover { border-color: var(--accent-2); }
.icon-btn__moon { display: none; }
[data-theme="light"] .icon-btn__sun { display: none; }
[data-theme="light"] .icon-btn__moon { display: block; }
.menu-btn { display: none; }

@media (max-width: 900px) {
    .js .menu-btn { display: inline-grid; }
    .js .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; margin: 0;
        background: var(--bg-elev); border-bottom: 1px solid var(--border); padding: .5rem 1rem 1rem; box-shadow: var(--shadow); }
    .js .nav.is-open { display: block; }
    .js .nav__list { flex-direction: column; }
    .js .nav__link { padding: .8rem 1rem; border-radius: 10px; }
    .nav { margin-left: 0; }
    .site-header__actions { margin-left: auto; }
    .site-header__bar { flex-wrap: wrap; }
    html:not(.js) .site-header__bar { padding-block: .5rem; }
}

/* ===== Hero ===== */
.hero { position: relative; isolation: isolate; min-height: min(72vh, 640px); display: grid; align-items: end; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; }
.hero__shade { position: absolute; inset: 0; z-index: -1;
    background: linear-gradient(to bottom, rgba(11, 13, 16, .15), var(--bg) 96%); }
[data-theme="light"] .hero__shade { background: linear-gradient(to bottom, rgba(246, 247, 249, .1), var(--bg) 96%); }
.hero__inner { padding-block: 5rem 3.5rem; animation: rise .8s ease both; }
.hero__text { max-width: 60ch; font-size: 1.15rem; color: var(--muted); }
.hero__actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.5rem; }
[data-theme="light"] .hero__bg { filter: invert(1) hue-rotate(180deg) saturate(.6) brightness(1.15); opacity: .5; }
.eyebrow { display: inline-flex; align-items: center; gap: .4rem; text-transform: uppercase; letter-spacing: .14em; font-size: .78rem; color: var(--accent); font-weight: 700; margin-bottom: .6rem; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: .5rem; padding: .75rem 1.25rem; border-radius: 12px;
    border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); text-decoration: none;
    font-weight: 600; transition: transform .2s, border-color .2s, background-color .2s;
}
.btn:hover { border-color: var(--accent-2); transform: translateY(-1px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { filter: brightness(1.08); border-color: var(--accent); }

/* ===== Sektionen ===== */
.section { padding-block: 2.5rem; }
.section__head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.section__title { margin-bottom: 1.2rem; }
.more { font-size: .95rem; }
.page-head { padding-block: 3.5rem 1.5rem; border-bottom: 1px solid var(--border);
    background: radial-gradient(900px 300px at 15% -20%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent); }
.center .page-head__lead { margin-inline: auto; }
.page-head__lead { max-width: 65ch; color: var(--muted); font-size: 1.1rem; }
.breadcrumb { font-size: .9rem; color: var(--muted); margin-bottom: .8rem; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; padding: 0; margin: 1rem 0 0; }
.chip { padding: .3rem .8rem; border: 1px solid var(--border); border-radius: 999px; font-size: .85rem; color: var(--muted); background: var(--bg-elev); }

/* ===== Kacheln & Karten ===== */
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.tile {
    position: relative; display: grid; gap: .35rem; padding: 1.4rem; border-radius: var(--radius);
    background: var(--bg-card); border: 1px solid var(--border); color: var(--text); text-decoration: none;
    transition: transform .25s, border-color .25s, box-shadow .25s;
}
.tile:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); }
.tile__icon { color: var(--accent-2); }
.tile__icon .icon { width: 1.8rem; height: 1.8rem; }
.tile__title { font-weight: 700; font-size: 1.15rem; }
.tile__text { color: var(--muted); font-size: .95rem; }
.tile__go { position: absolute; right: 1.1rem; top: 1.2rem; color: var(--muted); transition: transform .25s, color .25s; }
.tile:hover .tile__go { transform: translateX(4px); color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: transform .25s, box-shadow .25s, border-color .25s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent-2); }
.card__link { display: block; color: inherit; text-decoration: none; }
.card__media { aspect-ratio: 16 / 10; display: grid; place-items: center; color: color-mix(in srgb, var(--text) 55%, transparent);
    background: linear-gradient(135deg, #1b2230, #0f1319); }
.card__media .icon { width: 2.6rem; height: 2.6rem; }
.card__media img { width: 100%; height: 100%; object-fit: cover; }
.card__media--astrofotografie { background: radial-gradient(circle at 70% 30%, #26335a, #0a0d18 70%); }
.card__media--3d-druck { background: linear-gradient(135deg, #3a2412, #12100e); }
.card__media--ki { background: linear-gradient(135deg, #123238, #0c1114); }
.card__media--fun { background: linear-gradient(135deg, #3a1a35, #120c12); }
.card__media--downloads-links { background: linear-gradient(135deg, #1c2d1c, #0d120d); }
[data-theme="light"] .card__media { color: #fff; }
.card__body { padding: 1rem 1.15rem 1.2rem; }
.card__meta { font-size: .8rem; color: var(--muted); margin-bottom: .3rem; text-transform: uppercase; letter-spacing: .06em; }
.card__title { margin-bottom: .4rem; }
.card__text { color: var(--muted); font-size: .95rem; margin: 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.empty { padding: 2rem; border: 1px dashed var(--border); border-radius: var(--radius); color: var(--muted); text-align: center; }

/* ===== Text ===== */
.prose > * { max-width: 75ch; }
.prose h2 { margin-top: 1.8em; }
.prose ul { padding-left: 1.2rem; }
.prose--lead p:first-of-type { font-size: 1.15rem; }
.notice { padding: .9rem 1.1rem; border-radius: 10px; border: 1px solid var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.timeline { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--border); }
.timeline__item { position: relative; padding: 0 0 1.5rem 1.5rem; }
.timeline__item::before { content: ""; position: absolute; left: -7px; top: .45rem; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); }
.timeline__year { font-size: .85rem; color: var(--accent-2); font-weight: 700; }

/* ===== Footer ===== */
.site-footer { margin-top: 3rem; border-top: 1px solid var(--border); background: var(--bg-elev); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; padding-block: 2.5rem 1.5rem; }
.footer-title { font-weight: 700; margin-bottom: .6rem; }
.footer-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; }
.footer-list a { color: var(--muted); text-decoration: none; }
.footer-list a:hover { color: var(--text); text-decoration: underline; }
.footer-bottom { padding-block: 1rem 2rem; border-top: 1px solid var(--border); font-size: .9rem; }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; } }

/* ===== Animation ===== */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---- Phase 3: Inhaltsseiten (Galerie, Daten, Downloads, Profil) ---- */
.gallery { display: grid; gap: 1.5rem; margin-top: 1.5rem; }
.gallery--tiles { display: block; column-width: 240px; column-gap: .75rem; }
.gallery--tiles .gallery__item { break-inside: avoid; margin: 0 0 .75rem; }
.gallery--tiles .gallery__link { transition: transform .2s ease, box-shadow .2s ease; }
.gallery--tiles .gallery__link:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.35); }
.gallery--tiles figcaption { font-size: .85rem; }
.gallery--single { max-width: 900px; }
.gallery__item { margin: 0; }
.gallery__link { display: block; border-radius: var(--radius); overflow: hidden; background: var(--bg-card); }
.gallery__item img { width: 100%; height: auto; display: block; }
.gallery figcaption { margin-top: .5rem; color: var(--muted); font-size: .95rem; }
.specs { display: grid; grid-template-columns: max-content 1fr; gap: .4rem 1.5rem; margin: 0 0 1.5rem; }
.specs dt { color: var(--muted); }
.specs dd { margin: 0; overflow-wrap: anywhere; }
.downloads { list-style: none; padding: 0; display: grid; gap: .75rem; }
.downloads li { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; }
.profile { display: grid; gap: 2rem; align-items: start; }
.profile__img { width: 100%; max-width: 360px; height: auto; border-radius: var(--radius); }
@media (min-width: 800px) { .profile:has(.profile__img) { grid-template-columns: 300px 1fr; } }
.preview-bar { margin: 0; padding: .6rem 1rem; text-align: center; background: var(--accent); color: #111; font-weight: 600; }
.preview-bar a { color: #111; }
.hero__bg--photo { object-fit: cover; }

/* ---- Phase 4: Rubrikansichten, Suche, Filter ---- */
.search { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.25rem; max-width: 520px; }
.search__input { flex: 1 1 200px; padding: .6rem .9rem; font: inherit; color: var(--text); background: var(--bg-elev); border: 1px solid var(--border); border-radius: 999px; min-height: 44px; }
.chip--link { display: inline-flex; gap: .4rem; align-items: center; text-decoration: none; color: var(--text); min-height: 36px; }
.chip--link:hover { border-color: var(--accent); }
.chip--link[aria-current="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.chip__n { font-size: .75rem; opacity: .7; }
.filter-info { margin: 1rem 0 0; color: var(--muted); }
.group-title { font-size: 1.15rem; margin: 2rem 0 .5rem; color: var(--accent-2); }
.group-title:first-child { margin-top: 0; }
.pager { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 1rem; margin-top: 2rem; }

.photo-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.photo__link { display: block; position: relative; border-radius: var(--radius); overflow: hidden; color: #fff; text-decoration: none; background: #0a0d18; }
.photo__img { aspect-ratio: 4 / 3; border-radius: 0; }
.photo__img img { transition: transform .5s; }
.photo__link:hover .photo__img img, .photo__link:focus-visible .photo__img img { transform: scale(1.05); }
.photo__cap { position: absolute; inset: auto 0 0; display: grid; gap: .1rem; padding: 2.5rem 1rem .8rem; background: linear-gradient(to top, rgba(0, 0, 0, .8), transparent); }
.photo__title { font-size: 1.05rem; }
.photo__meta { font-size: .8rem; opacity: .85; }
.grid--projects .card__text { -webkit-line-clamp: 2; }
.facts { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: .8rem 0 0; padding: 0; }
.facts li { padding: .15rem .6rem; font-size: .78rem; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); }
.facts__dl { color: var(--accent-2) !important; border-color: var(--accent-2) !important; display: inline-flex; gap: .3rem; align-items: center; }
.facts__dl .icon { width: .9rem; height: .9rem; }

.linklist { list-style: none; margin: 0; padding: 0; display: grid; gap: .6rem; }
.linkrow { padding: .9rem 1.1rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
.linkrow:hover { border-color: var(--accent-2); }
.linkrow__title { margin: 0; font-size: 1.1rem; }
.linkrow__title a { text-decoration: none; color: var(--text); }
.linkrow__title a:hover { color: var(--accent-2); }
.linkrow__title .icon { width: .9rem; height: .9rem; vertical-align: -1px; }
.linkrow__text { margin: .2rem 0 0; color: var(--muted); }
.linkrow__meta { display: flex; flex-wrap: wrap; gap: .3rem 1rem; margin: .4rem 0 0; }
.pill { display: inline-block; padding: .05rem .6rem; border-radius: 999px; font-size: .78rem; font-weight: 700; }
.pill--warn { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--accent); }

.feature { margin-bottom: 1.5rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.feature__link { display: grid; color: inherit; text-decoration: none; }
.feature__media { aspect-ratio: 16 / 9; border-radius: 0; }
.feature__body { display: grid; gap: .6rem; align-content: center; padding: 1.4rem; }
.feature__title { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); }
.feature__text { color: var(--muted); }
.feature__link:hover .feature__title { color: var(--accent); }
@media (min-width: 800px) { .feature__link { grid-template-columns: 1.1fr 1fr; } .feature__media { aspect-ratio: auto; min-height: 280px; } }

/* Korrekturen Phase 4: Hoch-/Querformat darf die Kachelhöhe nie bestimmen; Icons in Linkzeilen inline */
.card__media, .photo__img, .feature__media { position: relative; overflow: hidden; }
.card__media img, .photo__img img, .feature__media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.linkrow__title .icon { display: inline-block; }

/* Phase 5: Lightbox */
html.lb-open { overflow: hidden; }
.lb { position: fixed; inset: 0; z-index: 100; display: grid; grid-template-rows: auto 1fr auto; background: rgba(5, 7, 10, .97); color: #fff; }
.lb[hidden] { display: none; }
.lb__bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .6rem .9rem; }
.lb__count { font-size: .9rem; opacity: .8; }
.lb__tools { display: flex; gap: .4rem; }
.lb__btn { min-width: 44px; min-height: 44px; padding: 0 .7rem; font: inherit; font-size: 1.15rem; color: #fff; background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .25); border-radius: 10px; cursor: pointer; }
.lb__btn:hover:not(:disabled) { background: rgba(255, 255, 255, .22); }
.lb__btn:disabled { opacity: .35; cursor: default; }
.lb__btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.lb__stage { position: relative; overflow: hidden; display: grid; place-items: center; touch-action: none; user-select: none; -webkit-user-select: none; }
.lb__img { max-width: 100%; max-height: 100%; object-fit: contain; transform-origin: center; cursor: zoom-in; will-change: transform; }
.lb.is-zoomed .lb__img { cursor: grab; }
.lb.is-loading .lb__img { opacity: .3; }
.lb__nav { position: absolute; top: 50%; translate: 0 -50%; width: 52px; height: 72px; font-size: 2.2rem; z-index: 2; }
.lb__nav--prev { left: .5rem; } .lb__nav--next { right: .5rem; }
.lb__cap { margin: 0; padding: .7rem 1rem 1rem; text-align: center; font-size: .95rem; opacity: .9; }
.lb.is-zoomed .lb__nav { opacity: .5; }
@media (max-width: 600px) { .lb__nav { width: 40px; height: 56px; } }
.gallery__link { cursor: zoom-in; }

/* Phase 5: STL-Betrachter */
.stl { margin: 1.2rem 0 1.8rem; padding: 1rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
.stl__head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .6rem; }
.stl__title { margin: 0; font-size: 1.05rem; }
.stl__stage { position: relative; margin-top: .8rem; height: clamp(260px, 55vw, 460px); border-radius: 10px; overflow: hidden; background: var(--bg-elev); border: 1px solid var(--border); }
.stl__stage:empty { display: none; }
.stl__stage canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.stl__status { margin: .6rem 0 0; min-height: 1.2em; color: var(--muted); font-size: .9rem; }
.stl__status.is-error { color: var(--accent); }
.stl__tools { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem; }
.stl__tools[hidden] { display: none; }
.stl__tools .btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.stl__info { margin: .5rem 0 0; font-size: .85rem; color: var(--muted); }
@media (prefers-reduced-motion: reduce) { .photo__img img, .card__media img { transition: none !important; } }