:root {
  --bg: #050b16;
  --bg2: #081325;
  --panel: rgba(14, 28, 52, 0.72);
  --panel-solid: #0d1b33;
  --line: rgba(120, 170, 255, 0.16);
  --line-strong: rgba(120, 170, 255, 0.34);
  --text: #e8eef9;
  --muted: #93a4c3;
  --dim: #5f7090;
  --gold: #f5c451;
  --teal: #2ee6c5;
  --sky: #4ea8ff;
  --red: #ff5d73;
  --violet: #a78bfa;
  --l1: #2ee6c5;
  --l2: #4ea8ff;
  --l3: #f5c451;
  --l4: #ff5d73;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text); font-family: var(--font);
  line-height: 1.7; -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: var(--sky); text-decoration: none; }
a:hover { color: var(--teal); }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }

/* ---------- nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50; height: 64px;
  display: flex; align-items: center; transition: background .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.nav.solid { background: rgba(5, 11, 22, 0.86); backdrop-filter: blur(14px); border-color: var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 28px; width: 100%; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); white-space: nowrap; }
.brand svg { width: 30px; height: 30px; }
.brand small { display: block; font-size: 10px; letter-spacing: .18em; color: var(--muted); font-weight: 500; line-height: 1.1; }
.brand b { display: block; line-height: 1.2; font-size: 15px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a { color: var(--muted); font-size: 13.5px; padding: 6px 10px; border-radius: 999px; transition: .2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(78, 168, 255, .12); }
.nav-cta { padding: 8px 16px; border-radius: 999px; background: linear-gradient(135deg, var(--gold), #ff9f43); color: #1a1205 !important; font-weight: 700; font-size: 14px; white-space: nowrap; }
.menu-btn { display: none; margin-left: auto; background: none; border: 1px solid var(--line-strong); color: var(--text); border-radius: 10px; padding: 6px 10px; font-size: 14px; }
@media (max-width: 1320px) {
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; background: rgba(5, 11, 22, .97); padding: 12px 16px 20px; border-bottom: 1px solid var(--line); }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
  .nav-cta { display: none; }
}

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; padding: 110px 0 60px; }
#heroCanvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero::after { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 40%, transparent 0%, rgba(5, 11, 22, .55) 60%, var(--bg) 100%); pointer-events: none; }
.hero .wrap { position: relative; z-index: 2; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--teal); letter-spacing: .12em; border: 1px solid rgba(46, 230, 197, .35); padding: 5px 14px; border-radius: 999px; background: rgba(46, 230, 197, .07); }
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 10px var(--teal); animation: pulse 1.8s infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.hero h1 { font-size: clamp(32px, 5.2vw, 64px); line-height: 1.15; margin: 22px 0 18px; letter-spacing: -.01em; font-weight: 800; }
.hero h1 .grad { background: linear-gradient(90deg, var(--gold), #ffb35c 40%, var(--teal)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: clamp(15px, 1.6vw, 19px); color: var(--muted); max-width: 760px; margin: 0 0 32px; }
.btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 24px; border-radius: 12px; font-weight: 700; font-size: 15px; border: 1px solid var(--line-strong); color: var(--text); background: rgba(255, 255, 255, .03); cursor: pointer; transition: .2s; font-family: inherit; }
.btn:hover { border-color: var(--teal); color: var(--text); transform: translateY(-1px); }
.btn.primary { background: linear-gradient(135deg, var(--gold), #ff9f43); color: #1a1205; border: none; box-shadow: 0 10px 30px -10px rgba(245, 196, 81, .6); }
.btn.primary:hover { color: #1a1205; }
.btn.sm { padding: 8px 14px; font-size: 13px; border-radius: 10px; }
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 56px; }
.kpi { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; backdrop-filter: blur(8px); position: relative; overflow: hidden; }
.kpi::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--c, var(--gold)); }
.kpi .v { font-size: clamp(26px, 3vw, 38px); font-weight: 800; color: var(--c, var(--gold)); line-height: 1.1; font-family: var(--mono); }
.kpi .k { font-size: 13px; color: var(--muted); margin-top: 6px; }
@media (max-width: 860px) { .kpis { grid-template-columns: repeat(2, 1fr); } }
.scroll-hint { position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 2; color: var(--dim); font-size: 12px; letter-spacing: .2em; animation: bob 2s infinite; }
@keyframes bob { 50% { transform: translate(-50%, 6px); } }

/* ---------- sections ---------- */
section.sec { padding: 110px 0 40px; position: relative; }
.sec-head { max-width: 820px; margin-bottom: 44px; }
.sec-head .tag { font-family: var(--mono); font-size: 12px; color: var(--gold); letter-spacing: .2em; }
.sec-head h2 { font-size: clamp(26px, 3.4vw, 40px); margin: 10px 0 14px; line-height: 1.25; }
.sec-head p { color: var(--muted); margin: 0; font-size: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; position: relative; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { color: var(--muted); margin: 0; font-size: 14.5px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 960px) { .grid3, .grid4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 720px) { .grid2, .grid3, .grid4 { grid-template-columns: 1fr; } }
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
.note { font-size: 12.5px; color: var(--dim); margin-top: 12px; }
.badge { display: inline-block; font-size: 11.5px; padding: 2px 9px; border-radius: 999px; border: 1px solid currentColor; line-height: 1.6; }
.badge.demo { color: var(--violet); }
.badge.paper { color: var(--gold); }
.badge.real { color: var(--teal); }

/* gaps */
.gap-card .from-to { display: flex; align-items: center; gap: 10px; margin: 14px 0 10px; font-size: 14px; flex-wrap: wrap; }
.gap-card .from { color: var(--dim); text-decoration: line-through; text-decoration-color: rgba(255, 93, 115, .6); }
.gap-card .arrow { color: var(--gold); }
.gap-card .to { color: var(--teal); font-weight: 700; }
.gap-card .gid { font-family: var(--mono); font-size: 12px; color: var(--red); letter-spacing: .15em; }

/* pipeline */
.pipeline { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; position: relative; }
.pipe-node { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 16px 14px; cursor: pointer; transition: .25s; position: relative; text-align: left; color: var(--text); font-family: inherit; }
.pipe-node:hover, .pipe-node.active { border-color: var(--c); box-shadow: 0 0 0 1px var(--c), 0 12px 40px -18px var(--c); transform: translateY(-3px); }
.pipe-node .step { font-family: var(--mono); font-size: 11px; color: var(--c); letter-spacing: .15em; }
.pipe-node .t { font-weight: 700; font-size: 15px; margin: 6px 0 4px; }
.pipe-node .s { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.pipe-node:not(:last-child)::after { content: ""; position: absolute; right: -12px; top: 50%; width: 12px; height: 2px; background: linear-gradient(90deg, var(--c), transparent); }
@media (max-width: 960px) { .pipeline { grid-template-columns: repeat(3, 1fr); } .pipe-node::after { display: none; } }
@media (max-width: 560px) { .pipeline { grid-template-columns: 1fr 1fr; } }
.pipe-detail { margin-top: 18px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 24px; align-items: start; }
.pipe-detail .formula { background: rgba(0, 0, 0, .25); border: 1px dashed var(--line-strong); border-radius: 12px; padding: 18px; overflow-x: auto; min-height: 120px; display: flex; flex-direction: column; justify-content: center; gap: 12px; }
.pipe-detail ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.pipe-detail code { font-family: var(--mono); font-size: 12.5px; color: var(--teal); background: rgba(46, 230, 197, .08); padding: 1px 6px; border-radius: 5px; }
@media (max-width: 860px) { .pipe-detail { grid-template-columns: 1fr; } }

/* charts */
.chart { width: 100%; height: 360px; }
.chart.tall { height: 440px; }
.chart.short { height: 280px; }
.seg { display: inline-flex; background: rgba(255, 255, 255, .04); border: 1px solid var(--line); border-radius: 10px; padding: 3px; gap: 2px; flex-wrap: wrap; }
.seg button { background: none; border: none; color: var(--muted); padding: 6px 12px; border-radius: 8px; font-size: 13px; cursor: pointer; font-family: inherit; }
.seg button.on { background: rgba(78, 168, 255, .18); color: var(--text); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }

/* layers */
.layers-wrap { display: grid; grid-template-columns: 1.15fr 1fr; gap: 24px; align-items: stretch; }
@media (max-width: 960px) { .layers-wrap { grid-template-columns: 1fr; } }
.tower { display: flex; flex-direction: column-reverse; gap: 8px; }
.tier { border-radius: 14px; padding: 18px 20px; border: 1px solid; position: relative; cursor: pointer; transition: .25s; display: grid; grid-template-columns: 54px 1fr auto; gap: 14px; align-items: center; }
.tier:hover, .tier.on { transform: translateX(6px); }
.tier .lv { font-family: var(--mono); font-size: 24px; font-weight: 800; }
.tier .who { font-weight: 700; font-size: 16px; }
.tier .rng { font-size: 13px; color: var(--muted); }
.tier .amt { text-align: right; font-family: var(--mono); font-weight: 700; font-size: 18px; }
.tier .amt small { display: block; font-size: 11px; color: var(--muted); font-weight: 400; font-family: var(--font); }
.tier.t1 { border-color: rgba(46, 230, 197, .4); background: linear-gradient(90deg, rgba(46, 230, 197, .14), rgba(46, 230, 197, .03)); } .tier.t1 .lv { color: var(--l1); }
.tier.t2 { border-color: rgba(78, 168, 255, .4); background: linear-gradient(90deg, rgba(78, 168, 255, .14), rgba(78, 168, 255, .03)); } .tier.t2 .lv { color: var(--l2); }
.tier.t3 { border-color: rgba(245, 196, 81, .4); background: linear-gradient(90deg, rgba(245, 196, 81, .14), rgba(245, 196, 81, .03)); } .tier.t3 .lv { color: var(--l3); }
.tier.t4 { border-color: rgba(255, 93, 115, .4); background: linear-gradient(90deg, rgba(255, 93, 115, .14), rgba(255, 93, 115, .03)); } .tier.t4 .lv { color: var(--l4); }
.boundary { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--gold); font-family: var(--mono); padding: 0 6px; }
.boundary::before, .boundary::after { content: ""; flex: 1; border-top: 1px dashed rgba(245, 196, 81, .5); }
.tier-info h3 { font-size: 22px; margin: 0 0 6px; }
.tier-info .logic { margin: 16px 0; padding: 14px 16px; border-radius: 12px; background: rgba(0, 0, 0, .22); border-left: 3px solid var(--gold); font-size: 14.5px; color: var(--muted); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: 14px; }
.kv dt { color: var(--dim); }
.kv dd { margin: 0; }

/* table */
.tbl { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.tbl th { color: var(--dim); font-weight: 500; font-size: 12.5px; letter-spacing: .05em; }
.tbl td.n { font-family: var(--mono); }
.tbl-scroll { overflow-x: auto; }
.dotc { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 8px; }

/* scenario */
.scenario { display: grid; grid-template-columns: 380px 1fr; gap: 24px; }
@media (max-width: 960px) { .scenario { grid-template-columns: 1fr; } }
.ctrl { margin-bottom: 20px; }
.ctrl label { display: flex; justify-content: space-between; font-size: 14px; color: var(--muted); margin-bottom: 8px; gap: 8px; }
.ctrl label b { color: var(--text); font-family: var(--mono); }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 6px; border-radius: 6px; background: linear-gradient(90deg, var(--teal) var(--p, 50%), rgba(255, 255, 255, .1) var(--p, 50%)); outline: none; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: #fff; border: 4px solid var(--teal); cursor: pointer; box-shadow: 0 0 14px rgba(46, 230, 197, .6); }
input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 4px solid var(--teal); cursor: pointer; }
.presets { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 12.5px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .03); color: var(--muted); cursor: pointer; font-family: inherit; transition: .2s; }
.chip:hover, .chip.on { color: var(--text); border-color: var(--gold); background: rgba(245, 196, 81, .1); }
.stackbar { display: flex; height: 54px; border-radius: 12px; overflow: hidden; background: rgba(255, 255, 255, .04); border: 1px solid var(--line); }
.stackbar div { height: 100%; transition: width .5s cubic-bezier(.2, .8, .2, 1); display: flex; align-items: center; justify-content: center; font-size: 12.5px; font-weight: 700; color: #071122; white-space: nowrap; overflow: hidden; }
.alloc { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 16px; }
@media (max-width: 640px) { .alloc { grid-template-columns: 1fr 1fr; } }
.alloc .a { border-radius: 12px; padding: 14px; background: rgba(255, 255, 255, .03); border: 1px solid var(--line); border-top: 3px solid var(--c); }
.alloc .a .w { font-size: 12.5px; color: var(--muted); }
.alloc .a .m { font-family: var(--mono); font-size: 22px; font-weight: 800; color: var(--c); }
.alloc .a .p { font-size: 12px; color: var(--dim); }
.verdict { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: rgba(0, 0, 0, .25); font-size: 14.5px; color: var(--muted); border: 1px solid var(--line); }
.verdict b { color: var(--text); }

/* sandbox */
.sandbox { display: grid; grid-template-columns: 330px 1fr; gap: 24px; }
@media (max-width: 1000px) { .sandbox { grid-template-columns: 1fr; } }
.sb-res { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 640px) { .sb-res { grid-template-columns: 1fr 1fr; } }
.sb-res .r { padding: 14px; border-radius: 12px; background: rgba(255, 255, 255, .03); border: 1px solid var(--line); }
.sb-res .r .k { font-size: 12px; color: var(--muted); }
.sb-res .r .v { font-family: var(--mono); font-size: 22px; font-weight: 800; color: var(--c, var(--text)); }
.sb-res .r .d { font-size: 11.5px; color: var(--dim); }
.running { display: none; align-items: center; gap: 10px; color: var(--teal); font-size: 13px; }
.running.on { display: inline-flex; }
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(46, 230, 197, .25); border-top-color: var(--teal); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.sb-charts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.sb-charts .card { padding: 16px; }
.sb-charts .wide { grid-column: 1 / -1; }
@media (max-width: 760px) { .sb-charts { grid-template-columns: 1fr; } }
details.adv summary { cursor: pointer; color: var(--muted); font-size: 13px; margin: 6px 0 14px; }

/* screen */
.screen { position: relative; border-radius: 22px; padding: 18px; background: radial-gradient(ellipse at 50% 0%, rgba(78, 168, 255, .12), transparent 60%), linear-gradient(180deg, #06101f, #040a14); border: 1px solid var(--line-strong); box-shadow: inset 0 0 80px rgba(78, 168, 255, .06); }
.screen:fullscreen { border-radius: 0; padding: 24px; overflow: auto; }
.screen-top { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; margin-bottom: 14px; gap: 10px; }
.screen-top .ttl { text-align: center; font-size: clamp(16px, 2vw, 24px); font-weight: 800; letter-spacing: .12em; background: linear-gradient(90deg, var(--sky), var(--teal)); -webkit-background-clip: text; background-clip: text; color: transparent; padding: 6px 30px; border-bottom: 2px solid rgba(46, 230, 197, .4); }
.screen-top .clock { font-family: var(--mono); color: var(--muted); font-size: 13px; }
.screen-top .right { text-align: right; display: flex; gap: 8px; justify-content: flex-end; align-items: center; flex-wrap: wrap; }
.screen-grid { display: grid; grid-template-columns: 1fr 1.6fr 1fr; gap: 14px; }
@media (max-width: 1000px) { .screen-grid { grid-template-columns: 1fr; } .screen-top { grid-template-columns: 1fr; text-align: center; } .screen-top .right { justify-content: center; } }
.sp { background: rgba(10, 24, 46, .6); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; margin-bottom: 14px; position: relative; }
.sp::before, .sp::after { content: ""; position: absolute; width: 10px; height: 10px; border: 2px solid var(--teal); }
.sp::before { left: -1px; top: -1px; border-right: none; border-bottom: none; border-radius: 4px 0 0 0; }
.sp::after { right: -1px; bottom: -1px; border-left: none; border-top: none; border-radius: 0 0 4px 0; }
.sp h4 { margin: 0 0 8px; font-size: 13.5px; color: var(--sky); letter-spacing: .08em; display: flex; justify-content: space-between; }
.sp h4 span { color: var(--dim); font-weight: 400; font-size: 11.5px; }
.feed { height: 230px; overflow: hidden; font-size: 12.5px; }
.feed .it { display: grid; grid-template-columns: 62px 1fr; gap: 8px; padding: 7px 0; border-bottom: 1px dashed var(--line); animation: slidein .5s ease; }
.feed .it time { font-family: var(--mono); color: var(--dim); }
.feed .lvl-h { color: var(--red); } .feed .lvl-m { color: var(--gold); } .feed .lvl-l { color: var(--teal); }
@keyframes slidein { from { opacity: 0; transform: translateY(-8px); } }
.prov-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.prov-stats .ps { padding: 10px; border-radius: 10px; background: rgba(255, 255, 255, .03); border: 1px solid var(--line); }
.prov-stats .ps .n { font-size: 12.5px; color: var(--muted); display: flex; justify-content: space-between; }
.prov-stats .ps .v { font-family: var(--mono); font-size: 20px; font-weight: 800; }
.bar-row { display: grid; grid-template-columns: 74px 1fr 46px; gap: 8px; align-items: center; font-size: 12px; margin: 9px 0; color: var(--muted); }
.bar-row .track { height: 8px; border-radius: 6px; background: rgba(255, 255, 255, .06); overflow: hidden; }
.bar-row .fill { height: 100%; border-radius: 6px; transition: width 1s ease; }
.bar-row .pc { font-family: var(--mono); text-align: right; color: var(--text); }

/* policy */
.policy .card { border-top: 3px solid var(--c); }
.policy .ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: rgba(255, 255, 255, .05); color: var(--c); margin-bottom: 14px; }
.policy ul { margin: 12px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.policy li { margin: 6px 0; }
.policy .lvl { font-size: 12px; color: var(--c); letter-spacing: .15em; font-family: var(--mono); }

/* gallery */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 860px) { .gallery { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .gallery { grid-template-columns: 1fr; } }
.gallery figure { margin: 0; background: #fff; border-radius: 14px; overflow: hidden; cursor: zoom-in; position: relative; border: 1px solid var(--line); }
.gallery img { width: 100%; height: 190px; object-fit: contain; display: block; transition: transform .4s; }
.gallery figure:hover img { transform: scale(1.04); }
.gallery figcaption { background: var(--panel-solid); padding: 10px 12px; font-size: 13px; color: var(--muted); }
.gallery figcaption b { color: var(--text); font-weight: 600; display: block; }
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(2, 6, 14, .92); display: none; align-items: center; justify-content: center; padding: 24px; flex-direction: column; gap: 12px; }
.lightbox.on { display: flex; }
.lightbox img { max-width: 100%; max-height: 82vh; border-radius: 10px; background: #fff; }
.lightbox .cap { color: var(--muted); font-size: 14px; text-align: center; }
.lightbox .x { position: absolute; top: 16px; right: 20px; font-size: 28px; color: var(--text); background: none; border: none; cursor: pointer; }

/* refs & footer */
.refs ol { color: var(--muted); font-size: 13.5px; padding-left: 22px; columns: 2; column-gap: 40px; }
.refs li { margin-bottom: 8px; break-inside: avoid; }
@media (max-width: 760px) { .refs ol { columns: 1; } }
footer { margin-top: 90px; border-top: 1px solid var(--line); padding: 40px 0 50px; color: var(--dim); font-size: 13px; }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr; gap: 30px; }
@media (max-width: 760px) { footer .cols { grid-template-columns: 1fr; } }
footer h5 { color: var(--muted); margin: 0 0 8px; font-size: 13px; }
.authors { display: flex; gap: 14px; flex-wrap: wrap; margin: 14px 0; }
.author { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); }
.author .av { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; color: #071122; background: linear-gradient(135deg, var(--gold), var(--teal)); }
.author .nm { font-weight: 700; color: var(--text); }
.author .rl { font-size: 12px; color: var(--muted); }
.katex { font-size: 1.06em; color: #dbe7ff; }
.katex-display { margin: 0; }
.tex-cap { font-size: 12px; color: var(--dim); }
.to-top { position: fixed; right: 20px; bottom: 20px; z-index: 40; width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-strong); background: rgba(5, 11, 22, .8); color: var(--text); cursor: pointer; opacity: 0; pointer-events: none; transition: .3s; font-size: 18px; }
.to-top.on { opacity: 1; pointer-events: auto; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } .reveal { opacity: 1; transform: none; } }