/* Projects-Seite. Tokens, Header, Footer, Einstieg und Bausteine: /site.css. */
.section-line { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.section-line .kicker { text-align: right; }
.status { display: inline-flex; align-items: center; gap: 8px; font: 500 .72rem/1.2 var(--f); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.status::before { content: ""; width: 6px; height: 6px; flex-shrink: 0; border-radius: 50%; background: var(--brand); }

/* Grafiken der Projektkarten */
.project-art { display: block; width: 100%; height: auto; color: var(--brand); }
.art-orbit { stroke: var(--rule); stroke-width: 1; }
.art-fine { stroke: var(--ink-3); stroke-opacity: .5; stroke-width: 1; fill: none; }
.art-accent { stroke: var(--brand); stroke-width: 1.5; }
.art-disc { fill: var(--bg); stroke: var(--brand); stroke-width: 1.2; }
.art-node { fill: var(--brand); }
.art-heavy { stroke: var(--brand); stroke-width: 9; stroke-linecap: round; }
.project-art text { fill: var(--ink-3); font: 500 10px var(--f); letter-spacing: 1.4px; text-anchor: middle; }
.project-art .paper-title { font: 300 30px var(--f); fill: var(--ink); letter-spacing: -1px; text-anchor: start; }
.project-art .paper-subtitle { font: 500 13px var(--f); fill: var(--brand); letter-spacing: 2px; text-anchor: start; }

/* Im Fokus: dunkle Fläche */
.feature-heading { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 32px 8%; align-items: end; margin-block: clamp(40px, 5vw, 64px) clamp(40px, 5vw, 60px); }
.feature-heading > div > p { font-weight: 300; font-size: 1.1rem; margin-top: 22px; max-width: 44ch; }
.feature-heading > div > .feature-note { font-weight: 400; font-size: .95rem; color: var(--ink-3); padding-left: 16px; border-left: 1px solid var(--brand); }
.engineering-stage { position: relative; padding: 24px clamp(18px, 3vw, 36px) 20px; background: color-mix(in oklch, var(--dk-ink) 3%, var(--dk)); border: 1px solid var(--dk-rule); border-radius: 24px; }
.stage-top { display: flex; justify-content: space-between; gap: 20px; }
.engineering-diagram { display: grid; grid-template-columns: 1fr 50px 1fr 50px 1fr 50px 1fr; align-items: center; padding: 40px 0 28px; }
.stage-node { text-align: center; padding: 22px 10px; border: 1px solid transparent; border-radius: 16px; transition: background-color .4s var(--ease), border-color .4s var(--ease), transform .4s var(--ease); }
.stage-node.is-active { background: color-mix(in oklch, var(--brand) 10%, transparent); border-color: var(--brand); transform: translateY(-4px); }
.stage-node strong { display: block; font-size: 1.15rem; font-weight: 400; color: var(--ink); }
.stage-node small { display: block; margin-top: 8px; font-size: .8rem; color: var(--ink-3); }
.node-icon { display: grid; place-items: center; width: 74px; height: 74px; margin: 0 auto 20px; font: 300 28px var(--f); border: 1px solid var(--rule-2); border-radius: 50%; color: var(--brand); transition: transform .5s var(--ease); }
.agent-symbol { font-size: 60px; border: 0; }
.is-active .agent-symbol { transform: rotate(90deg); }
.stage-connector { font-size: 26px; text-align: center; color: var(--brand); }
.feedback-line { display: flex; align-items: center; justify-content: center; gap: 24px; padding-top: 15px; border-top: 1px solid var(--rule); }
.feedback-line > span { font: 300 25px var(--f); letter-spacing: 0; }
.process-tabs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 24px; }
.process-tabs button { text-align: left; padding: 19px 12px; border: 0; border-bottom: 1px solid var(--rule); background: none; color: var(--ink-3); font-size: .95rem; cursor: pointer; transition: color .25s, border-color .25s; }
.process-tabs button span { font-size: .8rem; color: var(--brand); margin-right: 12px; font-variant-numeric: tabular-nums; }
.process-tabs button:hover { color: var(--ink); }
.process-tabs [aria-selected="true"] { color: var(--ink); border-bottom-color: var(--brand); }
.process-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 8%; min-height: 130px; padding-block: 28px; border-radius: 8px; }
.process-panel h3 { font-weight: 300; font-size: clamp(1.4rem, 2vw, 1.75rem); line-height: 1.2; letter-spacing: -0.03em; }
.process-panel p { font-size: .98rem; max-width: 58ch; }
.feature-link { margin-top: 14px; }

/* Projektübersicht */
.index-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-top: 40px; }
.index-heading > p { max-width: 34ch; font-weight: 300; font-size: 1.1rem; color: var(--ink-2); }
.filter-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: clamp(40px, 5vw, 56px); padding-block: 14px; border-block: 1px solid var(--rule); }
.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.filters button { min-height: 40px; padding: 0 16px; border: 1px solid var(--rule-2); border-radius: 999px; background: transparent; color: var(--ink-2); font-size: .9rem; cursor: pointer; transition: background-color .25s, border-color .25s, color .25s; }
.filters button span { margin-left: 8px; font-size: .75rem; opacity: .7; font-variant-numeric: tabular-nums; }
.filters button:not([aria-pressed="true"]):hover { border-color: var(--ink-3); color: var(--ink); }
.filters button[aria-pressed="true"] { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-ink); }
.filter-count { white-space: nowrap; }
.project-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 56px 24px; margin-top: 36px; align-items: start; }
.project-card[hidden] { display: none; }
.card-art { position: relative; overflow: hidden; background: var(--bg-2); border: 1px solid var(--rule-2); border-radius: 24px; transition: border-color .4s var(--ease); }
.card-art::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .24; background-image: linear-gradient(var(--rule) 1px, transparent 1px), linear-gradient(90deg, var(--rule) 1px, transparent 1px); background-size: 56px 56px; mask-image: radial-gradient(ellipse, black, transparent 80%); }
.art-number { position: absolute; top: 18px; left: 22px; font-size: .78rem; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.art-corner { position: absolute; right: 22px; bottom: 16px; font-size: 22px; color: var(--brand); }
.card-art .project-art { position: relative; padding: 22px 20px; transition: transform .6s var(--ease); }
.project-card:hover .card-art { border-color: var(--brand); }
.project-card:hover .project-art { transform: scale(1.035); }
.card-copy { padding-top: 24px; }
.card-meta { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.card-copy h3 { margin-top: 14px; font-weight: 300; font-size: clamp(1.6rem, 2.4vw, 2.1rem); line-height: 1.1; letter-spacing: -0.035em; }
.card-copy > p { margin-top: 14px; max-width: 54ch; color: var(--ink-2); }
.card-copy details { margin-top: 22px; border-block: 1px solid var(--rule-2); }
.card-copy summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 0; font-weight: 500; font-size: .95rem; color: var(--ink); border-radius: 8px; }
.card-copy summary::-webkit-details-marker { display: none; }
.details-copy { display: grid; gap: 12px; justify-items: start; padding: 0 0 22px; font-size: .95rem; color: var(--ink-2); }
.next span { display: block; margin-bottom: 4px; font: 500 .72rem/1.2 var(--f); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); }
.wave-bar { stroke: var(--brand); stroke-width: 4; stroke-linecap: round; transform-origin: center; transform-box: fill-box; }
.project-card:hover .wave-bar { animation: wave .8s ease-in-out calc(var(--i) * .025s) 2 alternate; }
.test-cell rect { stroke: var(--rule); fill: var(--bg); }
.test-cell path { stroke: var(--brand); stroke-width: 2; }
.project-card:hover .test-cell path { animation: check-in .6s ease calc(var(--i) * .08s) both; }
.book-layer { transition: transform .5s; }
.project-card:hover .book-layer { transform: translateY(calc(var(--i) * 5px - 5px)); }
.research-lens, .publication-pages { transform-origin: center; transition: transform .6s; }
.project-card:hover .research-lens { transform: translate(8px, -6px); }
.project-card:hover .publication-pages { transform: rotate(-4deg); }
@keyframes wave { to { transform: scaleY(.4); } }
@keyframes check-in { from { opacity: .1; } to { opacity: 1; } }

@media (min-width: 1100px) {
  .project-card:last-child { display: grid; grid-column: 1 / -1; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
  .project-card:last-child .card-copy { padding: 0 24px; }
  .project-card:last-child .card-art .project-art { max-height: 330px; }
}
@media (max-width: 1050px) {
  .engineering-diagram { grid-template-columns: 1fr 24px 1fr 24px 1fr 24px 1fr; }
  .stage-node { padding-inline: 4px; }
  .stage-node strong { font-size: 1rem; }
  .stage-node small { font-size: .72rem; }
  .card-meta { align-items: start; flex-direction: column; gap: 8px; }
  .process-panel { min-height: 150px; }
}
@media (max-width: 760px) {
  .section-line { align-items: start; }
  .section-line .kicker { max-width: 45%; }
  .feature-heading { grid-template-columns: 1fr; }
  .feature-heading > div > p { max-width: 100%; margin-top: 16px; }
  .stage-top { gap: 20px; }
  .stage-top span:last-child { text-align: right; }
  .engineering-diagram { grid-template-columns: 1fr 26px 1fr; gap: 8px 0; padding-block: 22px; }
  .stage-node { padding: 16px 6px; }
  .stage-connector:nth-child(4) { display: block; grid-column: 1 / -1; grid-row: 2; transform: rotate(90deg); line-height: 1; }
  .stage-node:nth-child(5) { grid-column: 1; grid-row: 3; }
  .stage-connector:nth-child(6) { grid-column: 2; grid-row: 3; }
  .stage-node:nth-child(7) { grid-column: 3; grid-row: 3; }
  .node-icon { width: 52px; height: 52px; font-size: 22px; margin-bottom: 12px; }
  .agent-symbol { font-size: 44px; }
  .feedback-line { gap: 14px; text-align: center; }
  .process-tabs button { font-size: .8rem; padding: 16px 4px; }
  .process-tabs button span { display: block; margin: 0 0 6px; }
  .process-panel { grid-template-columns: 1fr; gap: 12px; padding-block: 24px; min-height: 188px; }
  .index-heading { flex-direction: column; align-items: start; gap: 24px; }
  .filter-bar { flex-direction: column; align-items: start; gap: 10px; }
  .filters button { padding-inline: 12px; font-size: .85rem; }
  .project-grid { grid-template-columns: 1fr; gap: 44px; margin-top: 24px; }
  .card-meta { flex-direction: row; align-items: center; }
  .card-art .project-art { padding: 15px; }
}