:root{--bg:#f6f9fc;--surface:#fff;--text:#142033;--muted:#5b6878;--blue:#1769e0;--blue2:#0f4fae;--line:#dce5ef;--soft:#eaf2fb;--dark:#102033;--radius:18px;--shadow:0 16px 45px rgba(27,52,79,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:linear-gradient(180deg,#fbfdff 0,#f4f8fc 55%,#fff 100%);color:var(--text);line-height:1.65}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;display:block}.container{width:min(1160px,92%);margin:auto}.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:72px}.brand{font-weight:800;font-size:1.1rem;color:var(--text);letter-spacing:.2px}.brand span{color:var(--blue)}.menu{display:flex;flex-wrap:wrap;gap:18px;align-items:center}.menu a{color:var(--text);font-weight:650;font-size:.95rem}.lang{border:1px solid var(--line);padding:7px 11px;border-radius:999px;background:#fff}.hero{padding:72px 0 42px}.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:52px;align-items:center}.eyebrow{display:inline-block;background:var(--soft);color:var(--blue2);font-weight:800;padding:7px 12px;border-radius:999px;font-size:.82rem;letter-spacing:.06em;text-transform:uppercase}.hero h1{font-size:clamp(2.6rem,5vw,5.4rem);line-height:.98;margin:18px 0 22px;letter-spacing:-.055em}.lead{font-size:1.18rem;color:var(--muted);max-width:700px}.buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 20px;border-radius:12px;font-weight:800;border:1px solid var(--blue);background:var(--blue);color:#fff}.btn:hover{text-decoration:none;filter:brightness(.95)}.btn.secondary{background:#fff;color:var(--blue)}.screen{background:#111;border-radius:20px;padding:10px;box-shadow:var(--shadow);transform:perspective(1200px) rotateY(-2deg)}.screen img{border-radius:12px}.version-badge{width:180px;margin:18px auto 0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:22px 0 64px}.stat{background:#fff;border:1px solid var(--line);padding:20px;border-radius:16px;text-align:center}.stat strong{display:block;font-size:1.65rem;color:var(--blue)}section{padding:68px 0}.section-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-head{max-width:760px;margin-bottom:30px}.section-head h2,.page-head h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1.05;letter-spacing:-.035em;margin:0 0 14px}.section-head p,.page-head p{color:var(--muted);font-size:1.08rem}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:25px;box-shadow:0 8px 25px rgba(20,40,65,.05)}.card h3{margin:0 0 8px}.card p{color:var(--muted);margin:0}.icon{font-size:1.6rem;margin-bottom:10px}.feature-list{columns:2;column-gap:42px;padding-left:20px}.feature-list li{margin:0 0 10px;break-inside:avoid}.page-head{padding:58px 0 28px}.callout{background:linear-gradient(135deg,#eaf3ff,#f8fbff);border:1px solid #cfe1f5;border-radius:18px;padding:24px}.warning{background:#fff8e7;border-color:#ead395}.download-row{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}.download-row:last-child{border-bottom:0}.meta{font-size:.9rem;color:var(--muted)}.mini-btn{white-space:nowrap;display:inline-block;background:var(--blue);color:white;border-radius:10px;padding:9px 14px;font-weight:750}.mini-btn:hover{text-decoration:none}.media-card img{aspect-ratio:16/10;object-fit:cover;border-radius:13px;margin-bottom:16px}.timeline{border-left:3px solid #bdd4ee;margin-left:10px;padding-left:28px}.event{position:relative;margin:0 0 32px}.event:before{content:'';position:absolute;width:13px;height:13px;background:var(--blue);border:4px solid #fff;border-radius:50%;left:-39px;top:5px;box-shadow:0 0 0 1px #bdd4ee}.event strong{color:var(--blue)}.portrait{float:right;width:210px;margin:0 0 22px 30px;border-radius:18px;box-shadow:var(--shadow)}.book{display:grid;grid-template-columns:135px 1fr;gap:22px;align-items:start}.book img{border-radius:8px;box-shadow:0 10px 30px rgba(0,0,0,.16)}footer{background:var(--dark);color:#dbe7f4;padding:46px 0;margin-top:60px}footer a{color:#fff}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}.small{font-size:.9rem;color:#9fb0c3}.landing{min-height:100vh;display:grid;place-items:center;padding:30px}.landing-box{max-width:900px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:54px;text-align:center}.language-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:30px}.language-card{border:1px solid var(--line);border-radius:16px;padding:30px;background:#f9fbfe}.language-card h2{margin-top:0}@media(max-width:850px){.hero-grid,.grid3,.grid2,.footer-grid{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.menu{display:none}.feature-list{columns:1}.portrait{float:none;width:180px;margin:0 0 20px}.book{grid-template-columns:100px 1fr}}@media(max-width:520px){.stats,.language-grid{grid-template-columns:1fr}.hero{padding-top:42px}.landing-box{padding:30px 22px}.download-row{grid-template-columns:1fr}.mini-btn{width:max-content}}

/* Milestone 2 additions */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.gallery-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 25px rgba(20,40,65,.06)}.gallery-item a{display:block;background:#edf3f8}.gallery-item img{width:100%;height:230px;object-fit:contain}.gallery-item figcaption{padding:16px 18px;color:var(--muted)}.feature-link{display:block;color:inherit;height:100%}.feature-link:hover{text-decoration:none;transform:translateY(-2px)}.card{transition:transform .18s ease,box-shadow .18s ease}.card:hover{box-shadow:0 14px 35px rgba(20,40,65,.10)}.article-body{max-width:900px}.article-body h2{margin-top:2.2rem}.article-body h3{margin-top:1.7rem}.article-body p{color:#334155}.figure{margin:28px 0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}.figure img{margin:auto;max-height:560px}.figure figcaption{text-align:center;color:var(--muted);font-size:.92rem;margin-top:10px}.project-card{display:grid;grid-template-columns:180px 1fr;gap:25px;align-items:start}.project-card img{border-radius:14px}@media(max-width:850px){.gallery-grid{grid-template-columns:repeat(2,1fr)}.project-card{grid-template-columns:1fr}}@media(max-width:540px){.gallery-grid{grid-template-columns:1fr}}

/* Milestone 3 */
.hero-art{background:linear-gradient(145deg,#edf5ff,#fff);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow)}
.hero-art img{border-radius:14px;width:100%;max-height:520px;object-fit:contain}.real-interface{background:#0d1117;border-radius:20px;padding:12px;box-shadow:var(--shadow)}
.card-arrow{display:inline-block;margin-top:14px;font-weight:800;color:var(--blue)}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.specs{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 24px;padding:0;list-style:none}.specs li:before{content:'✓';color:var(--blue);font-weight:900;margin-right:9px}
.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:14px}.related{margin-top:45px;padding-top:25px;border-top:1px solid var(--line)}
.diagram-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px}.diagram-pair img{width:100%;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px}
@media(max-width:850px){.topic-grid,.diagram-pair,.specs{grid-template-columns:1fr}}


/* Milestone 4 — long-form technical pages */
.article-intro{font-size:1.14rem;line-height:1.75;color:#334155;margin:0 0 28px}
.article-body h2{font-size:1.75rem;line-height:1.2;letter-spacing:-.02em}
.article-body h3{font-size:1.2rem}.article-body ul,.article-body ol{padding-left:1.35rem}.article-body li{margin:.45rem 0}
.info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:25px 0}
.info-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.info-box h3{margin:0 0 8px}.info-box p{margin:0;color:var(--muted)}
.tech-note{border-left:5px solid var(--blue);background:#eef6ff;padding:20px 22px;border-radius:0 14px 14px 0;margin:28px 0}.tech-note strong{display:block;margin-bottom:5px}
.tip{border-left-color:#16a36a;background:#effbf5}.caution{border-left-color:#d49b20;background:#fff9e9}
.key-points{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 28px;list-style:none;padding:0}.key-points li{position:relative;padding-left:25px}.key-points li:before{content:'✓';position:absolute;left:0;color:var(--blue);font-weight:900}
.handbook-box{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;background:linear-gradient(135deg,#132a46,#1f4c79);color:#fff;border-radius:18px;padding:25px;margin-top:38px}.handbook-box .book-icon{font-size:2rem}.handbook-box h3{margin:0 0 5px}.handbook-box p{color:#d9e8f6;margin:0}
.screenshot-note{font-size:.85rem;color:var(--muted);text-align:center;margin-top:8px}
@media(max-width:700px){.info-grid,.key-points{grid-template-columns:1fr}.handbook-box{grid-template-columns:1fr}}

/* Milestone 5 */
.email-text{white-space:nowrap}.academic-band{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}.academic-band h2{font-size:clamp(1.8rem,3vw,2.7rem);line-height:1.1;margin:14px 0}.academic-band p{max-width:780px;color:var(--muted)}.gallery-strip{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:28px 0}.gallery-strip figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:15px;padding:12px}.gallery-strip img{width:100%;height:300px;object-fit:contain}.gallery-strip figcaption{text-align:center;color:var(--muted);font-size:.88rem;padding-top:8px}.image-pair{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.image-pair .figure{margin:20px 0}.api-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0}.api-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.api-card h3{margin-top:0;color:var(--blue2)}@media(max-width:850px){.academic-band,.gallery-strip,.image-pair,.api-grid{grid-template-columns:1fr}.gallery-strip img{height:auto}}


/* Milestone 6 additions */
.university-mark{display:grid;grid-template-columns:minmax(220px,365px) 1fr;gap:34px;align-items:center;padding:28px;margin:28px 0;background:#f8fafc;border:1px solid #dbe4ee;border-radius:22px}.university-mark img{width:100%;height:auto;object-fit:contain}.university-mark h2{margin-top:0}.complete-schematic{margin:28px 0;text-align:center}.complete-schematic img{display:block;width:min(100%,1000px);height:auto;margin:0 auto;background:#fff;border:1px solid #dbe4ee;border-radius:14px}.complete-schematic figcaption,.feature-figure figcaption{font-size:.92rem;color:#64748b;margin-top:10px}.feature-figure{margin:28px 0}.feature-figure img{display:block;width:min(100%,900px);height:auto;margin:auto;border-radius:14px;border:1px solid #dbe4ee}.zrlc-hardware-grid img{width:100%;max-height:330px;object-fit:contain;background:#fff}.release-card .download-row:first-child{border-top:0}.menu a[href="legacy.html"]{font-size:.92em;color:#475569}@media(max-width:760px){.university-mark{grid-template-columns:1fr}.university-mark img{max-width:330px;margin:auto}.complete-schematic{overflow-x:auto}.complete-schematic img{min-width:700px}}