/* PAGE HERO */
.page-hero{background:var(--surface);padding:80px 24px;text-align:center;border-bottom:1px solid var(--border)}
.page-hero .inner{max-width:720px;margin:0 auto}
.page-hero h1{font-family:var(--font-display);font-size:clamp(32px,4.5vw,48px);font-weight:650;letter-spacing:-.025em;margin-bottom:14px;color:var(--fg)}
.page-hero p{font-size:16px;color:var(--muted);line-height:1.7}

/* SECTIONS */
section{padding:72px 24px}
section .inner{max-width:var(--max-w);margin:0 auto}
.section-title{font-family:var(--font-display);font-size:24px;font-weight:600;letter-spacing:-.015em;margin-bottom:8px}
.section-sub{font-size:14px;color:var(--muted);margin-bottom:32px;max-width:600px}

/* MISSION */
.mission p{font-size:15px;color:var(--fg);line-height:1.8;margin-bottom:20px}
.mission p:last-child{margin-bottom:0}

/* Data update mechanism */
.mechanism-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:8px}
.m-card{padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.m-card .m-icon{width:40px;height:40px;border-radius:8px;background:color-mix(in srgb,var(--accent) 12%,transparent);display:flex;align-items:center;justify-content:center;margin-bottom:14px;color:var(--accent)}
.m-card h3{font-family:var(--font-display);font-size:16px;font-weight:600;margin-bottom:6px;color:var(--fg)}
.m-card p{font-size:13px;color:var(--muted);line-height:1.6}

/* VERSION HISTORY split layout */
.version-split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}

/* Left — timeline / fishbone */
.timeline{position:relative;padding-left:32px}
.timeline::before{content:'';position:absolute;left:11px;top:8px;bottom:8px;width:2px;background:var(--border)}
.tl-item{position:relative;margin-bottom:36px;padding-left:0}
.tl-item:last-child{margin-bottom:0}
.tl-marker{position:absolute;left:-32px;top:4px;width:24px;height:24px;border-radius:50%;background:#fff;border:2px solid var(--accent);display:flex;align-items:center;justify-content:center;z-index:1}
.tl-marker::after{content:'';width:8px;height:8px;border-radius:50%;background:var(--accent)}
.tl-version{font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--accent);letter-spacing:-.01em;margin-bottom:2px}
.tl-date{font-size:12px;color:var(--muted);margin-bottom:6px}
.tl-title{font-family:var(--font-display);font-size:15px;font-weight:600;margin-bottom:4px;color:var(--fg)}
.tl-desc{font-size:13px;color:var(--muted);line-height:1.6}
.tl-desc ul{list-style:none;padding:0;margin:6px 0 0}
.tl-desc ul li{position:relative;padding-left:14px;margin-bottom:3px;font-size:13px;color:var(--muted)}
.tl-desc ul li::before{content:'';position:absolute;left:0;top:7px;width:4px;height:4px;border-radius:50%;background:var(--border)}

/* Fishbone connectors — horizontal lines from marker */
.tl-item::before{content:'';position:absolute;left:-20px;top:14px;width:8px;height:2px;background:var(--accent)}

/* Right — future roadmap */
.roadmap{padding-left:0}
.rm-category{margin-bottom:32px}
.rm-category:last-child{margin-bottom:0}
.rm-badge{display:inline-block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;padding:3px 10px;border-radius:4px;margin-bottom:10px}
.rm-badge.next{background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent)}
.rm-badge.future{background:color-mix(in srgb,var(--muted) 12%,transparent);color:var(--muted)}
.rm-category h3{font-family:var(--font-display);font-size:16px;font-weight:600;margin-bottom:10px;color:var(--fg)}
.rm-list{list-style:none;padding:0}
.rm-list li{position:relative;padding:10px 0 10px 20px;border-bottom:1px solid var(--border);font-size:14px;color:var(--fg);line-height:1.5}
.rm-list li:last-child{border-bottom:none}
.rm-list li::before{content:'';position:absolute;left:0;top:16px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.rm-list li .rm-note{display:block;font-size:12px;color:var(--muted);margin-top:2px}

/* Responsive */
@media(max-width:900px){
  .version-split{grid-template-columns:1fr;gap:48px}
  .mechanism-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  section{padding:48px 16px}
}
@media(max-width:600px){
  .mechanism-grid{grid-template-columns:1fr}
  section{padding:40px 16px}
  .page-hero{padding:56px 16px}
  .timeline{padding-left:28px}
}