/* ============================================================
   ROCK Ⅲ · 洛克三号 — instfree-inspired design system
   Rounded cards · soft shadows · pill badges · centered hero
   Palette: #0b0c0d bg · #ecece6 text · #f2762a accent
   ============================================================ */

/* ================= Tokens ================= */
:root {
  --bg: #0b0c0d;
  --bg2: #0f1011;
  --card: #14161a;
  --card-hover: #1a1d22;
  --card2: #1c1f24;
  --line: rgba(236,236,230,.10);
  --line-soft: rgba(236,236,230,.06);
  --text: #ecece6;
  --muted: #a3a49c;
  --faint: #6b6c66;
  --accent: #f2762a;
  --accent-hi: #ff8b45;
  --accent-soft: rgba(242,118,42,.12);
  --accent-line: rgba(242,118,42,.38);
  --ok: #9fc28a;
  --k-request: #f2762a;
  --k-event: #d9a441;
  --k-stream: #9fc28a;
  --k-notification: #7f8a9a;

  --r: 28px;
  --r-sm: 20px;
  --r-xs: 14px;
  --pill: 100px;

  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.28);
  --shadow-lg: 0 2px 4px rgba(0,0,0,.5), 0 12px 40px rgba(0,0,0,.45);

  --ease: cubic-bezier(.4,0,.2,1);
  --sans: "SF Pro Display","SF Pro",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --mono: ui-monospace,"Cascadia Mono",Consolas,"Courier New",monospace;
  --wrap: 1120px;
  --pad: clamp(1.25rem,4vw,2.5rem);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.7 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}

h1,h2,h3{font-weight:700;letter-spacing:-0.03em;line-height:1.15;margin:0}
p,ul,ol,dl{margin:0}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
strong{font-weight:600;color:var(--text)}
nobr{white-space:nowrap}

code{
  font-family:var(--mono);font-size:.86em;color:var(--text);
  background:var(--card2);border:1px solid var(--line-soft);
  border-radius:6px;padding:.05rem .35rem;word-break:break-word;
}

::selection{background:rgba(242,118,42,.3);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}

.skip-link{position:absolute;left:1rem;top:-4rem;z-index:90;padding:.55rem 1rem;background:var(--card);border:1px solid var(--accent-line);border-radius:var(--r-xs)}
.skip-link:focus{top:.7rem}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ================= Nav ================= */
nav{
  position:sticky;top:0;z-index:60;
  background:rgba(11,12,13,.78);
  backdrop-filter:blur(20px) saturate(160%);
  -webkit-backdrop-filter:blur(20px) saturate(160%);
  border-bottom:1px solid var(--line-soft);
}
.nav-inner{
  width:min(100% - var(--pad)*2,var(--wrap));margin-inline:auto;
  display:flex;align-items:center;gap:1.5rem;padding-block:.75rem;
}
.nav-logo{
  display:inline-flex;align-items:center;gap:.32em;
  font:700 1.2rem/1 var(--sans);letter-spacing:-.02em;color:var(--text);flex:none;
}
.logo-img{height:40px;width:auto;display:block;}
.logo-img-footer{height:36px;width:auto;display:block;}
.logo-red{color:var(--accent)}
.logo-bars{display:inline-flex;gap:.11em;align-items:stretch;height:.85em;margin-left:.08em}
.logo-bars i{width:.16em;background:var(--accent);border-radius:.04em;display:block}

.nav-links{display:flex;gap:.2rem;flex:1;overflow-x:auto;scrollbar-width:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{
  display:block;padding:.42rem .72rem;font-size:.85rem;color:var(--muted);
  white-space:nowrap;border-radius:var(--pill);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-links a:hover{color:var(--text);background:rgba(236,236,230,.06)}
.nav-links a.is-active{color:var(--text);background:rgba(242,118,42,.12)}

.nav-meta{
  flex:none;display:flex;align-items:center;gap:.5rem;
  font:500 .72rem/1 var(--mono);letter-spacing:.06em;color:var(--faint);
}
.dot-live{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 var(--accent-line);animation:pulse 2.6s ease-out infinite}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(242,118,42,.5)}
  70%{box-shadow:0 0 0 9px rgba(242,118,42,0)}
  100%{box-shadow:0 0 0 0 rgba(242,118,42,0)}
}

/* ================= Section chrome ================= */
.section-inner{width:min(100% - var(--pad)*2,var(--wrap));margin-inline:auto}
.section-inner.narrow{width:min(100% - var(--pad)*2,840px)}
.sec-alt{background:var(--bg2)}

section{padding-block:clamp(3.5rem,8vh,5.5rem)}
section + section{border-top:1px solid var(--line-soft)}

.section-label{
  display:inline-flex;align-items:center;
  font:500 .72rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);background:var(--accent-soft);
  border:1px solid var(--accent-line);border-radius:var(--pill);padding:.35rem .85rem;margin-bottom:1.2rem;
}
.section-title{font-size:clamp(1.8rem,3.6vw,2.8rem);letter-spacing:-.035em;margin-bottom:.7rem}
.section-desc{color:var(--muted);font-size:.95rem;max-width:58em;margin-bottom:clamp(2rem,4vw,3rem);line-height:1.7}
.section-desc b,.section-desc strong{color:var(--text);font-weight:600}
.section-desc code{font-size:.85em}

.two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:clamp(1.5rem,3vw,2.6rem);margin-top:clamp(2rem,4vw,3rem);align-items:start}

.block-label{
  font:500 .68rem/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);margin:0 0 .85rem;display:flex;align-items:baseline;gap:.55rem;
}
.block-label::before{content:"";flex:none;width:3px;height:.85em;background:var(--accent);border-radius:2px;transform:translateY(1px)}
.block-foot{font-size:.78rem;line-height:1.7;color:var(--faint);margin-top:.8rem}

/* ================= Hero ================= */
.hero{
  position:relative;overflow:hidden;
  padding-top:clamp(3rem,8vh,5.5rem);
  padding-bottom:clamp(2.5rem,5vh,4rem);
  background:
    radial-gradient(60% 50% at 70% 20%,rgba(242,118,42,.10),transparent 72%),
    radial-gradient(80% 60% at 30% 110%,rgba(242,118,42,.06),transparent 60%),
    radial-gradient(40% 35% at 80% 80%,rgba(242,118,42,.04),transparent 70%),
    var(--bg);
}
.hero::before{
  content:"";position:absolute;top:-20%;right:-10%;width:60%;height:80%;
  background:radial-gradient(ellipse at center,rgba(242,118,42,.06) 0%,transparent 70%);
  animation:heroGlow 8s ease-in-out infinite alternate;pointer-events:none;
}
@keyframes heroGlow{
  0%{opacity:.6;transform:translate(0,0) scale(1)}
  100%{opacity:1;transform:translate(-3%,2%) scale(1.05)}
}
.hero-grid{
  width:min(100% - var(--pad)*2,var(--wrap));margin-inline:auto;
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,0.9fr);
  gap:clamp(2rem,5vw,4.5rem);align-items:center;
}
.hero-copy{min-width:0}

.hero-badge{
  display:inline-flex;align-items:center;gap:.55rem;
  font:500 .76rem/1 var(--mono);letter-spacing:.06em;
  color:var(--muted);background:var(--card);
  border:1px solid var(--line);border-radius:var(--pill);
  padding:.4rem 1rem .4rem .7rem;margin-bottom:1.8rem;
}
.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 2.6s ease-out infinite;flex:none}

.hero h1{
  font-size:clamp(2.6rem,5.8vw,4.4rem);font-weight:700;
  letter-spacing:-.04em;line-height:1.08;
  margin-bottom:1.4rem;
  background:linear-gradient(135deg,var(--text) 0%,var(--text) 60%,var(--accent) 140%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero h1 span{
  display:block;
  font-size:clamp(1.1rem,2.2vw,1.65rem);font-weight:500;
  letter-spacing:-.01em;line-height:1.4;
  color:var(--muted);margin-top:.6rem;
  -webkit-text-fill-color:var(--muted);
}

.hero-desc{color:var(--muted);font-size:1rem;max-width:42em;margin-bottom:2rem;line-height:1.75}

.hero-stats{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;background:linear-gradient(135deg,var(--line-soft),var(--accent-line),var(--line-soft));
  border:1px solid var(--line-soft);border-radius:var(--r);
  overflow:hidden;margin-bottom:2rem;
}
.hero-stat{background:var(--card);padding:1.1rem .8rem;text-align:center}
.hero-stat-value{font-size:1.5rem;font-weight:700;letter-spacing:-.02em;color:var(--text);margin-bottom:.25rem}
.hero-stat-value span{font-size:.7em;font-weight:500;color:var(--accent);margin-left:.05em}
.hero-stat-label{font:400 .72rem/1.4 var(--mono);color:var(--faint);letter-spacing:.02em}

.hero-actions{display:flex;flex-wrap:wrap;gap:.7rem}
.hero-btn-primary{
  display:inline-flex;align-items:center;gap:.5rem;
  font:600 .92rem/1 var(--sans);letter-spacing:-.01em;
  background:var(--accent);color:#180d03;
  border:none;border-radius:var(--pill);padding:.95rem 1.6rem;cursor:pointer;
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.hero-btn-primary:hover{background:var(--accent-hi);transform:translateY(-1px);box-shadow:0 4px 20px -4px rgba(242,118,42,.45)}
.hero-btn-primary svg{flex:none}
.hero-btn-secondary{
  font:600 .92rem/1 var(--sans);letter-spacing:-.01em;
  color:var(--text);background:var(--card);
  border:1px solid var(--line);border-radius:var(--pill);
  padding:.95rem 1.6rem;cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.hero-btn-secondary:hover{background:var(--card-hover);border-color:var(--muted)}

/* ---- Hero device ---- */
.hero-device-wrap{text-align:center}
.device{display:flex;flex-direction:column;align-items:center;animation:deviceFloat 6s ease-in-out infinite}
@keyframes deviceFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-8px)}
}
.device-shell{
  width:100%;padding:clamp(.85rem,1.6vw,1.15rem);
  border-radius:var(--r);
  background:linear-gradient(168deg,#24272c 0%,#191b1f 42%,#101215 100%);
  border:1px solid rgba(236,236,230,.12);
  box-shadow:var(--shadow-lg),inset 0 1px 0 rgba(236,236,230,.10),0 0 60px -10px rgba(242,118,42,.08);
  position:relative;
}
.device-screen{
  position:relative;aspect-ratio:16/10;border-radius:var(--r-sm);
  background:radial-gradient(120% 100% at 50% 0%,#131619 0%,#0a0b0c 78%);
  border:1px solid rgba(0,0,0,.7);
  box-shadow:inset 0 0 40px rgba(0,0,0,.75);
  display:grid;place-items:center;overflow:hidden;
}
.device-screen::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(180deg,rgba(236,236,230,.025) 0 1px,transparent 1px 3px);
  pointer-events:none;
}
.device-led{
  position:absolute;bottom:.42rem;left:50%;transform:translateX(-50%);
  width:5px;height:5px;border-radius:50%;background:var(--accent);opacity:.55;
}

.face{
  display:grid;
  grid-template-columns:auto auto;
  justify-content:center;align-items:center;
  gap:clamp(1.2rem,3.4vw,2.4rem) clamp(1.5rem,4.4vw,3rem);
  width:100%;padding-bottom:6%;
}
.face .eye{
  width:clamp(22px,3.9vw,38px);height:clamp(40px,6.9vw,68px);
  background:var(--text);border-radius:999px;
  box-shadow:0 0 22px rgba(236,236,230,.22);
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.eye-l{grid-column:1;grid-row:1}
.eye-r{grid-column:2;grid-row:1}
.mouth{
  grid-column:1/-1;grid-row:2;
  width:clamp(42px,8vw,76px);height:clamp(11px,2vw,17px);overflow:visible;
}
.mouth path{fill:none;stroke:var(--text);stroke-width:2.6;stroke-linecap:round;opacity:0;transition:opacity .2s var(--ease)}
.face[data-expr="idle"] .m-idle{opacity:1}
.face[data-expr="blink"] .eye{transform:scaleY(.08)}
.face[data-expr="blink"] .m-idle{opacity:1}
.face[data-expr="talk"] .eye{transform:scaleY(.78)}
.face[data-expr="talk"] .m-talk{opacity:1;fill:var(--text);stroke:var(--text)}
.face[data-expr="think"] .eye-l{transform:scaleY(.38)}
.face[data-expr="think"] .eye-r{transform:translateY(-9%) scaleY(.9)}
.face[data-expr="think"] .m-think{opacity:1}
.face[data-expr="happy"] .eye{transform:scaleY(.4);background:var(--accent);box-shadow:0 0 24px rgba(242,118,42,.4)}
.face[data-expr="happy"] .m-happy{opacity:1;stroke:var(--accent)}

.screen-tag{position:absolute;left:.7rem;bottom:.5rem;font:500 .62rem/1 var(--mono);letter-spacing:.12em;color:var(--faint)}
.screen-tag::before{content:"expr · ";color:rgba(236,236,230,.28)}

.device-chin{
  width:100%;margin-top:.75rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-xs);padding:.62rem .85rem;
}
.chin-q{font-size:.82rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chin-dots{display:flex;gap:5px;flex:none}
.chin-dots span{width:7px;height:7px;border-radius:50%;background:var(--line);transition:background .2s var(--ease),transform .2s var(--ease)}
.chin-dots span.is-on{background:var(--accent);transform:scaleY(1.5)}

.device-note{font:400 .72rem/1.6 var(--mono);letter-spacing:.03em;color:var(--faint);margin-top:.8rem}
.device-note code{font-size:.9em}

/* ================= 01 Capabilities ================= */
.features-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.2rem}
.feature-card{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);padding:1.8rem 1.5rem;
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.feature-card:hover{transform:translateY(-3px);border-color:var(--accent-line);box-shadow:var(--shadow),0 0 30px -8px rgba(242,118,42,.15)}
.feature-icon{
  width:48px;height:48px;border-radius:var(--r-xs);
  background:var(--accent-soft);border:1px solid var(--accent-line);
  display:grid;place-items:center;margin-bottom:1.2rem;
}
.feature-icon svg{width:24px;height:24px;stroke:var(--accent);stroke-width:1.5}
.feature-card h3{font-size:1.2rem;letter-spacing:-.02em;margin-bottom:.5rem}
.feature-card p{color:var(--muted);font-size:.9rem;line-height:1.65;margin-bottom:1rem}
.feature-card p strong{color:var(--text)}
.feature-meta{display:flex;align-items:center;gap:.6rem;font-size:.78rem}
.feature-meta code{color:var(--accent);border-color:var(--accent-line);background:transparent;font-size:.82em}
.chip-stage{
  font:500 .66rem/1 var(--mono);letter-spacing:.06em;
  color:var(--faint);border:1px solid var(--line);
  border-radius:var(--pill);padding:.26rem .6rem;white-space:nowrap;
}

.constraints-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.2rem;margin-top:2rem}
.constraint-card{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-sm);padding:1.5rem 1.3rem;
  transition:border-color .3s var(--ease);
}
.constraint-card:hover{border-color:rgba(242,118,42,.25)}
.constraint-card h3{font-size:1.05rem;margin-bottom:.4rem;color:var(--text)}
.constraint-card h3::before{content:"";display:inline-block;width:3px;height:.9em;background:var(--accent);border-radius:2px;margin-right:.5rem;transform:translateY(1px)}
.constraint-card p{color:var(--muted);font-size:.88rem;line-height:1.65}
.constraint-src{display:block;font:400 .72rem/1.5 var(--mono);color:var(--faint);margin-top:.8rem}

/* ================= 02 Scenarios ================= */
.usecase-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.2rem}
.usecase-card{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);padding:1.8rem 1.5rem;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.usecase-card:hover{transform:translateY(-2px);box-shadow:var(--shadow),0 0 24px -6px rgba(242,118,42,.12)}
.usecase-icon{
  width:44px;height:44px;border-radius:var(--r-xs);
  background:var(--card2);border:1px solid var(--line);
  display:grid;place-items:center;margin-bottom:1.2rem;
}
.usecase-icon svg{width:22px;height:22px;stroke:var(--accent);stroke-width:1.5}
.usecase-card h3{font-size:1.1rem;letter-spacing:-.02em;margin-bottom:.5rem}
.usecase-card p{color:var(--muted);font-size:.89rem;line-height:1.65;margin-bottom:1rem}
.usecase-tag{
  font:500 .68rem/1 var(--mono);letter-spacing:.08em;
  color:var(--accent);background:var(--accent-soft);
  border-radius:var(--pill);padding:.28rem .65rem;
}

/* ================= 03 Architecture ================= */
.arch-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line-soft);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-bottom:2rem}
.arch-layer{background:var(--card);padding:1.3rem 1.2rem;transition:background .2s var(--ease)}
.arch-layer:hover{background:var(--card-hover)}
.arch-layer-title{font:600 .78rem/1.3 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:.8rem}
.arch-items{display:flex;flex-direction:column;gap:.4rem}
.arch-item{font-size:.85rem;color:var(--muted);padding:.3rem 0}
.arch-item strong{color:var(--text);font-weight:600}
.arch-item span{font-size:.72rem;color:var(--faint);margin-left:.3rem}

.table-wrap{overflow-x:auto;scrollbar-width:thin}
.data-table{width:100%;border-collapse:collapse;font-size:.88rem;min-width:480px}
.data-table th,.data-table td{text-align:left;padding:.7rem .85rem;border-bottom:1px solid var(--line-soft);vertical-align:top}
.data-table thead th{font:500 .68rem/1.3 var(--mono);letter-spacing:.13em;text-transform:uppercase;color:var(--faint);border-bottom:1px solid var(--line)}
.data-table tbody th{font:500 .82rem/1.5 var(--mono);color:var(--accent);white-space:nowrap}
.data-table td{color:var(--muted)}
.data-table tbody tr:hover{background:var(--card)}
.table-caption{caption-side:top;text-align:left;font:400 .75rem/1.6 var(--mono);color:var(--faint);padding-bottom:.75rem}
.table-foot{font-size:.78rem;line-height:1.75;color:var(--faint);margin-top:1rem;max-width:72em}
.topic-table{min-width:680px}
.topic-table tbody th{white-space:normal;word-break:break-all}
.data-table .empty-row{color:var(--faint);text-align:center}
.nowrap{white-space:nowrap}

.kind-tag{
  display:inline-block;font:500 .66rem/1 var(--mono);letter-spacing:.06em;
  border:1px solid var(--line);border-radius:var(--pill);padding:.24rem .55rem;
  color:var(--muted);white-space:nowrap;
}
.kind-request{border-color:rgba(242,118,42,.45);color:var(--k-request)}
.kind-event{border-color:rgba(217,164,65,.4);color:var(--k-event)}
.kind-stream{border-color:rgba(159,194,138,.4);color:var(--k-stream)}
.kind-notification{border-color:rgba(127,138,154,.45);color:var(--k-notification)}
.lvl{font:400 .75rem/1 var(--mono);color:var(--faint)}

/* ================= 04 Contracts ================= */
.contract-hero{
  display:flex;flex-wrap:wrap;align-items:center;gap:2rem 3rem;
  background:linear-gradient(135deg,var(--card) 0%,rgba(242,118,42,.04) 100%);
  border:1px solid var(--line);
  border-radius:var(--r);padding:2rem 2.2rem;margin-bottom:2rem;
  box-shadow:var(--shadow);
}
.contract-big{
  font:700 clamp(2.4rem,5vw,3.6rem)/1 var(--sans);letter-spacing:-.03em;
  color:var(--text);
}
.contract-big span{color:var(--accent)}
.contract-meta-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.6rem 2rem;flex:1;min-width:280px}
.contract-meta-item{display:flex;flex-direction:column;gap:.15rem}
.contract-meta-item b{font:500 .82rem/1.3 var(--mono);color:var(--accent)}
.contract-meta-item span{font-size:.78rem;color:var(--muted)}

.byte-bar-wrap{margin-bottom:2rem}
.byte-bar{display:flex;gap:3px;margin-bottom:.6rem}
.byte-cell{
  flex-grow:1;flex-shrink:1;min-width:4.35rem;
  font:500 .7rem/1.3 var(--mono);color:var(--muted);
  background:var(--card2);border:1px solid var(--line);
  border-radius:8px;padding:.6rem .2rem;cursor:pointer;
  overflow:hidden;text-align:center;white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.byte-cell:hover{color:var(--text);border-color:var(--muted)}
.byte-cell[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:#180d03}
.byte-cell.is-reserved{background:repeating-linear-gradient(135deg,var(--card2) 0 6px,#191c20 6px 12px);color:var(--faint);min-width:7rem}
.byte-cell.is-reserved[aria-pressed="true"]{background:repeating-linear-gradient(135deg,var(--accent) 0 6px,#e8691f 6px 12px);border-color:var(--accent);color:#180d03}
.byte-note{font-size:.75rem;line-height:1.7;color:var(--faint);margin-bottom:1.1rem;max-width:68em}
.byte-note b{font-family:var(--mono);font-weight:500;color:var(--muted)}

.byte-detail{
  background:var(--card);border:1px solid var(--line-soft);
  border-left:3px solid var(--accent);border-radius:var(--r-sm);
  padding:1.1rem 1.25rem;min-height:7rem;
}
.byte-detail h3{font:500 1rem/1.3 var(--mono);color:var(--accent);margin-bottom:.5rem}
.byte-detail dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:.6rem 1.2rem;margin-bottom:.8rem}
.byte-detail dt{font:500 .64rem/1 var(--mono);letter-spacing:.13em;text-transform:uppercase;color:var(--faint)}
.byte-detail dd{font-size:.84rem;font-family:var(--mono);margin-top:.25rem}
.byte-detail p{color:var(--muted);font-size:.88rem}

.cover-list{display:grid;gap:.5rem}
.cover-list li{
  display:flex;align-items:flex-start;gap:.7rem;
  border:1px solid var(--line-soft);border-radius:var(--r-xs);
  background:var(--card);padding:.8rem .95rem;font-size:.83rem;color:var(--muted);
}
.cover-list code{font-size:.78rem}
.cover-tag{flex:none;font:500 .64rem/1 var(--mono);letter-spacing:.06em;border-radius:var(--pill);padding:.26rem .55rem}
.cover-yes{color:var(--ok);border:1px solid rgba(159,194,138,.4)}
.cover-no{color:var(--accent);border:1px solid var(--accent-line)}

/* ================= 05 Topics ================= */
.dist{display:grid;gap:.8rem;margin-bottom:1.8rem}
.dist-bar{display:flex;height:12px;border-radius:var(--r-xs);overflow:hidden;border:1px solid var(--line);background:var(--card)}
.dist-seg{transition:flex-grow .2s var(--ease)}
.dist-seg[data-kind="request"]{background:var(--k-request)}
.dist-seg[data-kind="event"]{background:var(--k-event)}
.dist-seg[data-kind="stream"]{background:var(--k-stream)}
.dist-seg[data-kind="notification"]{background:var(--k-notification)}
.dist-legend{display:flex;flex-wrap:wrap;gap:.4rem 1.6rem}
.dist-legend li{display:flex;align-items:center;gap:.5rem;font-size:.8rem;color:var(--muted)}
.dist-key{width:9px;height:9px;border-radius:3px;flex:none}
.dist-key[data-kind="request"]{background:var(--k-request)}
.dist-key[data-kind="event"]{background:var(--k-event)}
.dist-key[data-kind="stream"]{background:var(--k-stream)}
.dist-key[data-kind="notification"]{background:var(--k-notification)}
.dist-n{font:500 .78rem/1 var(--mono);color:var(--text)}

.filters{display:flex;flex-wrap:wrap;gap:1.1rem 2.4rem;align-items:flex-start;margin-bottom:1.5rem}
.filter-group{min-width:0}
.filter-label{font:500 .66rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:.55rem}
.filter-count{font:400 .78rem/1.5 var(--mono);color:var(--faint);align-self:flex-end;padding-bottom:.3rem;margin-left:auto}
.chip-row{display:flex;flex-wrap:wrap;gap:.45rem}
.chip-row.vertical{flex-direction:column}
.chip{
  font:400 .84rem/1.4 var(--sans);text-align:left;
  color:var(--muted);background:var(--card);
  border:1px solid var(--line);border-radius:var(--pill);
  padding:.44rem .9rem;cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.chip:hover{color:var(--text);border-color:var(--muted)}
.chip[aria-pressed="true"]{color:var(--text);border-color:var(--accent);background:var(--accent-soft)}
.chip .chip-n{font-family:var(--mono);font-size:.72rem;color:var(--faint);margin-left:.3rem}
.chip[aria-pressed="true"] .chip-n{color:var(--accent)}

/* ================= 06 Try ================= */
.try-grid{display:grid;grid-template-columns:260px minmax(0,1fr);gap:clamp(1rem,2.5vw,1.8rem);align-items:start}
.try-side{display:flex;flex-direction:column;gap:.5rem}
.try-modules-label{font:500 .66rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin:1rem 0 .35rem}
.try-modules{display:grid;gap:.28rem}
.try-modules li{font:400 .76rem/1.6 var(--mono);color:var(--muted);display:flex;gap:.45rem}
.try-modules li::before{content:"";flex:none;width:3px;background:var(--accent);border-radius:2px;margin-block:.3rem}
.try-modules li b{font-weight:600;color:var(--text)}

.try-btn-block{
  font:600 .85rem/1 var(--sans);color:var(--text);
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--pill);padding:.7rem 1rem;cursor:pointer;
  margin-top:1.1rem;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.try-btn-block:hover{background:var(--card-hover);border-color:var(--muted)}

.app-mock{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-lg),0 0 40px -12px rgba(242,118,42,.06);
}
.mock-topbar{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.85rem 1.15rem;border-bottom:1px solid var(--line-soft);
  background:var(--card2);
}
.mock-title{font:600 .95rem/1.3 var(--sans);letter-spacing:-.01em}
.status-pill{
  font:500 .71rem/1 var(--mono);letter-spacing:.05em;white-space:nowrap;
  color:var(--muted);border:1px solid var(--line);border-radius:var(--pill);
  padding:.28rem .8rem;
}
.status-pill.is-ok{color:var(--ok);border-color:rgba(159,194,138,.4)}
.status-pill.is-running{color:var(--accent);border-color:var(--accent-line)}

.mock-body{padding:1.2rem;display:flex;flex-direction:column;gap:1.1rem}
.label{
  font:500 .66rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--faint);
  margin-bottom:.5rem;display:flex;align-items:center;gap:.5rem;
}
.badge-demo{
  display:inline-flex;align-items:center;
  font:500 .62rem/1 var(--mono);letter-spacing:.06em;
  color:var(--accent);border:1px solid var(--accent-line);
  border-radius:var(--pill);padding:.14rem .5rem;
}
.question-block,.steps-block{min-width:0}
.question-text{
  font-size:1.02rem;line-height:1.6;font-weight:500;
  background:var(--card2);border:1px solid var(--line-soft);
  border-left:3px solid var(--accent);border-radius:var(--r-xs);
  padding:.8rem 1rem;
}
.step-list{display:flex;flex-direction:column;gap:.35rem}
.step{
  display:flex;align-items:flex-start;gap:.65rem;
  font-size:.87rem;color:var(--muted);
  padding:.5rem .65rem;border:1px solid transparent;border-radius:var(--r-xs);
}
.step.is-active{color:var(--text);background:var(--card2);border-color:var(--line-soft)}
.step.is-done{color:var(--text)}
.step-icon{
  flex:none;width:1.05rem;height:1.05rem;margin-top:.25rem;
  border-radius:50%;border:1.5px solid var(--faint);
  display:grid;place-items:center;font-size:.6rem;line-height:1;color:transparent;
}
.step.is-done .step-icon{border-color:var(--ok);color:var(--ok)}
.step.is-done .step-icon::before{content:"\2713"}
.step.is-active .step-icon{border-color:var(--accent);border-right-color:transparent;animation:spin .9s linear infinite}
.step.is-pending .step-icon{border-style:dashed}
@keyframes spin{to{transform:rotate(360deg)}}

.source-list{display:flex;flex-direction:column;gap:.35rem}
.source-item{
  display:flex;align-items:baseline;gap:.6rem;
  font-size:.8rem;color:var(--muted);
  background:var(--card2);border:1px solid var(--line-soft);
  border-radius:var(--r-xs);padding:.5rem .7rem;
}
.source-idx{flex:none;color:var(--accent);font:500 .7rem/1 var(--mono);border:1px solid var(--accent-line);border-radius:6px;padding:.14rem .32rem}
.source-title{font-family:var(--mono);font-size:.78rem;color:var(--text);word-break:break-all}
.source-note{margin-left:auto;color:var(--faint);font-size:.72rem;white-space:nowrap}

.source-block,.conclusion-block{opacity:.32;transition:opacity .3s var(--ease)}
.source-block.is-revealed,.conclusion-block.is-revealed{opacity:1}
.done-pill{font-size:.66rem;color:var(--ok);border:1px solid rgba(159,194,138,.4);border-radius:var(--pill);padding:.1rem .5rem}
.conclusion-text{
  font-size:.87rem;color:var(--text);
  background:var(--accent-soft);border:1px solid var(--line-soft);
  border-radius:var(--r-xs);padding:.75rem .9rem;
}

/* ================= 07 Progress ================= */
.roadmap{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:1px;background:var(--line-soft);
  border:1px solid var(--line-soft);border-radius:var(--r);
  overflow:hidden;margin-bottom:1.5rem;
}
.roadmap>li{background:var(--card);padding:1.1rem 1rem 1.2rem;display:flex;flex-direction:column;gap:.4rem;position:relative}
.road-id{font:600 1.1rem/1 var(--sans);color:var(--faint);letter-spacing:-.01em}
.roadmap h3{font-size:.9rem;color:var(--muted);letter-spacing:-.01em}
.roadmap p{font-size:.79rem;color:var(--faint);line-height:1.6}
.roadmap .is-done .road-id{color:var(--ok)}
.roadmap .is-done h3{color:var(--text)}
.roadmap .is-current{background:var(--card2);box-shadow:inset 0 2px 0 var(--accent)}
.roadmap .is-current .road-id{color:var(--accent)}
.roadmap .is-current h3{color:var(--text)}
.road-tag{align-self:flex-start;margin-top:auto;font:500 .62rem/1.4 var(--mono);letter-spacing:.06em;border-radius:var(--pill);padding:.18rem .55rem}
.is-done .road-tag{color:var(--ok);border:1px solid rgba(159,194,138,.4)}
.is-current .road-tag{color:var(--accent);border:1px solid var(--accent-line)}
.is-plan .road-tag{color:var(--faint);border:1px solid var(--line)}

.goal-list{display:grid;gap:.5rem;margin-bottom:.5rem}
.goal-list li{color:var(--muted);font-size:.88rem;padding-left:1.15rem;position:relative}
.goal-list li::before{content:"\25B8";position:absolute;left:0;color:var(--accent)}

.doc-index{display:grid;gap:.55rem}
.doc-index li{display:grid;gap:.18rem;padding-bottom:.55rem;border-bottom:1px solid var(--line-soft)}
.doc-index code{align-self:start;justify-self:start;font-size:.78rem;color:var(--accent);background:transparent;border-color:var(--line-soft)}
.doc-index span{color:var(--faint);font-size:.79rem}

.join-card{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem 2rem;
  border:1px solid var(--line);border-radius:var(--r);
  background:linear-gradient(100deg,var(--accent-soft),transparent 55%),var(--card);
  padding:1.5rem 1.6rem;margin-top:clamp(1.6rem,3vw,2.4rem);
  box-shadow:var(--shadow);
}
.join-card h3{font-size:1.15rem;margin-bottom:.5rem}
.join-card p{color:var(--muted);font-size:.9rem;max-width:56em}
.join-note{font:400 .76rem/1.6 var(--mono);color:var(--faint);border-left:2px solid var(--accent-line);padding-left:.8rem;max-width:24em}

/* ================= 08 Demo notes ================= */
.demo-list{display:grid;gap:.75rem}
.demo-list li{color:var(--muted);font-size:.9rem;padding-left:1.35rem;position:relative}
.demo-list li::before{content:"";position:absolute;left:0;top:.55rem;width:10px;height:10px;background:var(--accent);border-radius:3px;opacity:.5}
.demo-list code{font-size:.82em}

/* ================= Footer ================= */
footer{padding-block:2rem 2.4rem}
.footer-inner{
  width:min(100% - var(--pad)*2,var(--wrap));margin-inline:auto;
  display:flex;flex-wrap:wrap;gap:1.2rem 2rem;justify-content:space-between;align-items:flex-start;
  border-top:1px solid var(--line);padding-top:1.4rem;
}
.footer-brand{font-size:1rem;font-weight:700;letter-spacing:-.01em;display:flex;align-items:center;gap:.6rem}
.badge-demo{display:inline-flex;align-items:center;font:500 .62rem/1 var(--mono);letter-spacing:.06em;color:var(--accent);border:1px solid var(--accent-line);border-radius:var(--pill);padding:.14rem .5rem}
.footer-note{color:var(--faint);font-size:.79rem;margin-top:.4rem;max-width:46em}
.footer-nav{display:flex;flex-direction:column;gap:.45rem}
.footer-nav a{color:var(--faint);font-size:.82rem;transition:color .2s var(--ease)}
.footer-nav a:hover{color:var(--text)}

/* ================= Modal ================= */
.modal{position:fixed;inset:0;z-index:80}
.modal[hidden]{display:none}
.modal-backdrop{position:absolute;inset:0;background:rgba(6,7,8,.78);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.modal-card{
  position:relative;margin:auto;top:50%;transform:translateY(-50%);
  width:min(100% - 2rem,1000px);max-height:calc(100vh - 3rem);overflow:auto;
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);padding:1.8rem;
  box-shadow:0 34px 90px -20px rgba(0,0,0,.9);
}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:.7rem}
.modal-head h2{font-size:1.2rem;display:flex;align-items:center;gap:.7rem;flex-wrap:wrap}
.modal-close{
  font:500 .76rem/1 var(--mono);color:var(--muted);
  background:transparent;border:1px solid var(--line);border-radius:var(--pill);
  padding:.45rem .85rem;cursor:pointer;flex:none;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.modal-close:hover{color:var(--text);border-color:var(--muted)}
.modal-lede{color:var(--muted);font-size:.89rem;margin-bottom:1.3rem;max-width:66em}
.modal-grid{display:grid;grid-template-columns:230px minmax(0,1fr);gap:1.2rem}
.modal-grid .mock-body{border:1px solid var(--line-soft);border-radius:var(--r-sm);background:var(--bg)}
.run-status{color:var(--accent);font:500 .68rem/1 var(--mono);letter-spacing:.08em}
body.modal-open{overflow:hidden}

/* ================= Responsive ================= */
@media(max-width:1080px){
  .features-grid,.constraints-grid,.usecase-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .arch-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .roadmap{grid-template-columns:repeat(4,minmax(0,1fr))}
}

@media(max-width:900px){
  .hero h1{font-size:clamp(2.2rem,8vw,3.4rem)}
  .hero-grid{grid-template-columns:1fr;gap:2rem}
  .hero-stats{grid-template-columns:repeat(3,minmax(0,1fr))}
  .hero-device-wrap{max-width:420px;margin:0 auto}
  .try-grid{grid-template-columns:1fr}
  .try-side .chip-row.vertical{flex-direction:row}
  .try-side .try-btn-block{width:auto;align-self:flex-start}
  .modal-grid{grid-template-columns:1fr}
  .features-grid,.constraints-grid,.usecase-grid{grid-template-columns:1fr}
  .arch-grid{grid-template-columns:1fr}
}

@media(max-width:719px){
  nav .nav-links{display:none}
  .nav-meta{margin-left:auto}
  .hero-stats{grid-template-columns:repeat(3,minmax(0,1fr))}
  .roadmap{grid-template-columns:repeat(2,minmax(0,1fr))}
  .filters{gap:1rem}
  .filter-count{margin-left:0}
  .source-note{display:none}
  .byte-bar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}
  .byte-cell{flex:none!important;min-width:0!important;font-size:.68rem;padding:.5rem .3rem}
  .contract-hero{flex-direction:column;align-items:flex-start;gap:1.2rem}
  .contract-meta-grid{grid-template-columns:1fr}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .step.is-active .step-icon{animation:none;border-color:var(--accent);border-right-color:var(--accent)}
  .dot-live,.pulse-dot{animation:none}
  .device{animation:none}
  .hero::before{animation:none}
  .feature-card,.usecase-card,.chip,.byte-cell,.face .eye,.mouth path{transition:none}
  .nav-links a,.arch-layer{transition:none}
}