/* HSIMC archival engineering learning case · local stylesheet C0-001 */
:root{color-scheme:dark;--bg:#0b1520;--panel:#142436;--panel2:#1a2f41;--fg:#eaf3f7;--muted:#bfd0db;--subtle:#88a8ba;--line:#355166;--mint:#a5e5d9}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--fg);font:16px/1.72 system-ui,-apple-system,"Segoe UI",sans-serif;margin:0}
a{color:#b0e5f7;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.top{max-width:1250px;margin:auto;padding:22px 26px;display:flex;flex-wrap:wrap;gap:25px;align-items:center;justify-content:space-between}.brand{font-size:1.4rem;font-weight:800;letter-spacing:.03em;color:#fff}.brand small{display:block;font-size:.63rem;letter-spacing:.11em;color:var(--subtle);font-weight:600}.top nav{display:flex;gap:15px;flex-wrap:wrap;font-size:.86rem}.top nav a{color:var(--muted)}.top nav a.active{color:var(--mint)}
main{max-width:1160px;padding:0 26px;margin:auto}section{padding:45px 0;border-bottom:1px solid var(--line)}.hero{padding:65px 0 45px}
.eyebrow{font-size:.78rem;color:var(--mint);font-weight:800;letter-spacing:.14em;text-transform:uppercase}h1,h2,h3{line-height:1.25;letter-spacing:-.025em}h1{font-size:clamp(2.2rem,5.4vw,4.7rem);max-width:990px;margin:16px 0 23px}h1 span{color:var(--mint)}h2{font-size:clamp(1.65rem,3vw,2.55rem)}h3{font-size:1.2rem}.lead{max-width:940px;font-size:1.18rem;color:#d2e1e9}.zh{max-width:980px;color:#d6e6ee}.fine,.muted,small{color:var(--subtle)}.fine{font-size:.88rem}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.actions a,.action{padding:11px 17px;border:1px solid #5a8199;border-radius:9px;font-size:.91rem;display:inline-block}.actions a.primary{background:var(--mint);color:#11303b;font-weight:800;border-color:var(--mint)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:35px 0}.stat,.card,.note,.lesson,.step{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:19px}.stat b{display:block;font-size:2.2rem;font-weight:750;line-height:1.2;color:#d5fff4}.stat span{display:block;font-size:.83rem;color:var(--muted);margin-top:8px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.card h3{margin:9px 0}.card p{color:var(--muted);margin-bottom:8px}.marker{font-size:.76rem;color:var(--mint);text-transform:uppercase;letter-spacing:.09em;font-weight:700}.note{background:var(--panel2);border-left:4px solid var(--mint);border-radius:5px;margin:20px 0}
.timeline{display:grid;gap:0}.timeline article{display:grid;grid-template-columns:190px 1fr;gap:22px;border-top:1px solid var(--line);padding:22px 0}.timeline article span{font-size:.81rem;color:var(--mint);letter-spacing:.04em;font-weight:700}.timeline h3{margin:0 0 8px}.timeline p{margin:5px 0;color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.step b{color:var(--mint);font-size:.82rem}.step h3{margin:7px 0}.step p{color:var(--muted);margin:0;font-size:.95rem}
.tablewrap{overflow:auto;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;min-width:720px;text-align:left}th,td{padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#1a3448;color:#caffef;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em}td{color:var(--muted)}td strong{color:var(--fg)}tr:last-child td{border-bottom:0}
.figure{float:right;width:min(30%,220px);margin:0 0 16px 24px}.figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:12px}.figure figcaption{font-size:.76rem;color:var(--subtle);padding:6px}
.status{font-size:.75rem;border:1px solid #5c847e;border-radius:5px;padding:3px 8px;white-space:nowrap;display:inline-block}.status.review{border-color:#977c51}.status.pending{border-color:#627c93}
.key{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.91em;color:#bce4d9;overflow-wrap:anywhere}.links{display:flex;flex-wrap:wrap;gap:17px;margin:20px 0}.links a{text-decoration:underline;text-underline-offset:4px}.quote{border-left:3px solid var(--mint);padding-left:21px;color:#dcf7f0;font-size:1.25rem;max-width:950px;margin:30px 0}footer{max-width:1200px;margin:auto;padding:28px;color:var(--subtle);font-size:.85rem}
@media(max-width:800px){.top{padding:15px 22px}.stats,.steps{grid-template-columns:repeat(2,1fr)}.timeline article{grid-template-columns:1fr;gap:5px}.figure{float:none;width:180px;margin:8px 0 20px}.grid{grid-template-columns:1fr}}
@media(max-width:520px){main{padding:0 18px}.stats,.steps{grid-template-columns:1fr 1fr}.stat b{font-size:1.55rem}.stat{padding:13px}.stat span{font-size:.75rem}section{padding:33px 0}.hero{padding-top:38px}}