@property --reveal { syntax: '<number>'; inherits: false; initial-value: 0; }
:root {
  --l0: #070707; --l1: #0c0c0c; --l2: #131313; --l3: #1a1a1a;
  --l4: #252525; --l5: #333; --l6: #4a4a4a; --l7: #777;
  --l8: #aaa; --l9: #ccc; --la: #e8e8e8;
  --f: 'JetBrains Mono', ui-monospace, monospace; --w: 680px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--l0); color: var(--l8); font: 13.5px/1.6 var(--f); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body::before { content: ''; position: fixed; inset: 0; background-image: radial-gradient(circle, var(--l4) 0.5px, transparent 0.5px); background-size: 24px 24px; opacity: 0.3; pointer-events: none; z-index: 0; }
body::after { content: ''; position: fixed; inset: 0; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); opacity: 0.03; pointer-events: none; z-index: 9998; }

nav { position: sticky; top: 0; z-index: 20; background: rgba(7,7,7,0.85); backdrop-filter: blur(24px) saturate(150%); -webkit-backdrop-filter: blur(24px) saturate(150%); border-bottom: 1px solid rgba(255,255,255,0.04); padding: 0 24px; box-shadow: 0 1px 0 rgba(255,255,255,0.02); }
.ni { max-width: var(--w); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 48px; }
.logo { color: var(--l9); text-decoration: none; font-weight: 500; font-size: 13px; letter-spacing: -0.02em; transition: color 0.3s; }
.logo:hover { color: var(--la); }
.logo .c { display: inline-block; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.nr { display: flex; gap: 20px; }
.nr a { color: var(--l6); text-decoration: none; font-size: 12px; transition: color 0.25s; position: relative; }
.nr a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 1px; background: var(--l8); transition: width 0.3s cubic-bezier(0.25,0.46,0.45,0.94); }
.nr a:hover { color: var(--la); }
.nr a:hover::after { width: 100%; }

article { max-width: var(--w); margin: 0 auto; padding: 0 24px 96px; position: relative; z-index: 1; }
.bk { display: inline-block; color: var(--l6); text-decoration: none; font-size: 11px; transition: color 0.2s; opacity: 0; animation: fadeIn 0.5s 0.1s forwards; }
.bk:hover { color: var(--la); }

.ph { padding: 48px 0 32px; margin-bottom: 40px; position: relative; opacity: 0; animation: fadeUp 0.6s 0.15s forwards; }
.ph::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, var(--l5), transparent 70%); }
.ph h1 { font-size: 24px; font-weight: 500; color: var(--la); line-height: 1.3; margin: 14px 0 16px; letter-spacing: -0.03em; text-shadow: 0 0.5px 0 rgba(255,255,255,0.06); }
.progress { position: fixed; top: 0; left: 0; height: 1px; background: var(--l6); z-index: 30; width: 0%; transition: width 0.1s linear; }
.pm { font-size: 11px; color: var(--l6); }
.tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 16px; }
.tag { font-size: 10px; color: var(--l7); border: 1px solid var(--l4); padding: 2px 8px; letter-spacing: 0.02em; transition: all 0.2s; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.bd .s { opacity: 0; transform: translateY(20px) perspective(800px) rotateX(2deg); transform-origin: center top; transition: all 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94); }
.bd .s.v { opacity: 1; transform: translateY(0) perspective(800px) rotateX(0deg); }

.bd h2 { font-size: 14px; font-weight: 500; color: var(--la); margin: 0 0 0.75em; padding-top: 2.5em; position: relative; text-shadow: 0 0.5px 0 rgba(255,255,255,0.06); }
.bd h2::before { content: ''; position: absolute; top: 0.5em; left: 0; width: 40px; height: 1px; background: linear-gradient(90deg, var(--l6), transparent); }
.bd h3 { font-size: 13px; font-weight: 500; color: var(--l9); margin: 1.5em 0 0.5em; }
.bd p { margin: 0.8em 0; line-height: 1.8; font-size: 13px; color: #b0b0b0; }
.bd .lead { font-size: 14.5px; color: var(--l9); line-height: 1.75; margin-bottom: 1.5em; }
.bd strong { color: var(--la); font-weight: 500; }
.bd ul { padding-left: 22px; margin: 0.8em 0; list-style: none; }
.bd li { margin: 0.4em 0; font-size: 13px; line-height: 1.7; position: relative; padding-left: 4px; }
.bd li::before { content: '>'; color: var(--l5); position: absolute; left: -14px; font-size: 11px; font-weight: 500; }
.bd hr { border: none; height: 1px; background: linear-gradient(90deg, var(--l4), transparent); margin: 2.5em 0; }

.bd code { font-size: 11.5px; background: var(--l2); border: 1px solid var(--l3); border-top-color: rgba(255,255,255,0.06); padding: 2px 6px; color: var(--l9); box-shadow: inset 0 -1px 0 rgba(0,0,0,0.3); }
.bd pre { background: var(--l1); padding: 18px 22px; overflow-x: auto; margin: 1.5em 0; position: relative; border: 1px solid var(--l3); border-top-color: rgba(255,255,255,0.05); border-bottom-color: rgba(0,0,0,0.4); box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), inset 0 -1px 0 rgba(0,0,0,0.2), 0 1px 2px rgba(0,0,0,0.2), 0 2px 4px rgba(0,0,0,0.15), 0 4px 8px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.08); transition: padding 0.5s cubic-bezier(0.22,1,0.36,1), background 0.5s cubic-bezier(0.22,1,0.36,1), box-shadow 0.5s cubic-bezier(0.22,1,0.36,1), border-color 0.5s cubic-bezier(0.22,1,0.36,1); }
.bd pre:hover { padding: 24px 24px; background: var(--l2); border-color: var(--l4); border-top-color: rgba(255,255,255,0.08); box-shadow: inset 0 1px 0 rgba(255,255,255,0.05), inset 0 -1px 0 rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.2), 0 4px 8px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.12), 0 16px 32px rgba(0,0,0,0.08); }
.bd pre::before { content: ''; position: absolute; top: 0; left: 0; bottom: 0; width: 3px; background: linear-gradient(180deg, var(--l6), var(--l4)); box-shadow: 1px 0 8px rgba(255,255,255,0.02); transition: background 0.5s cubic-bezier(0.22,1,0.36,1); }
.bd pre:hover::before { background: linear-gradient(180deg, var(--l8), var(--l5)); }
.bd pre code { padding: 0; background: none; border: none; color: var(--l8); font-size: 12px; line-height: 1.75; box-shadow: none; transition: line-height 0.5s cubic-bezier(0.22,1,0.36,1); }
.bd pre:hover code { line-height: 1.95; }
.bd pre .kw { color: var(--la); font-weight: 500; transition: color 0.5s; }
.bd pre .ty { color: var(--l9); transition: color 0.5s; }
.bd pre .cm { color: var(--l6); font-style: italic; transition: color 0.5s, opacity 0.5s; opacity: 0.7; }
.bd pre:hover .cm { color: var(--l8); opacity: 1; }
.bd pre .num { color: var(--l9); transition: color 0.5s; }
.bd pre .str { color: var(--l7); transition: color 0.5s; }
.bd pre .fn { color: var(--l9); transition: color 0.5s; }
.bd pre .op { color: var(--l7); }
.bd pre .mac { color: var(--l8); font-weight: 500; transition: color 0.5s; }
.bd pre:hover .kw { color: #fff; }
.bd pre:hover .ty { color: var(--la); }
.bd pre:hover .num { color: var(--la); }
.bd pre:hover .str { color: var(--l9); }
.bd pre:hover .fn { color: var(--la); }
.bd pre:hover .mac { color: var(--la); }

.bd pre [data-tip] { position: relative; cursor: pointer; border-bottom: 1px dashed transparent; transition: border-color 0.3s, color 0.3s; }
.bd pre [data-tip]:hover { border-bottom-color: var(--l5); color: #fff !important; }
.bd pre [data-tip]::after { content: attr(data-tip); position: absolute; left: 0; top: calc(100% + 6px); background: var(--l3); border: 1px solid var(--l4); border-top-color: rgba(255,255,255,0.08); color: var(--l9); font-size: 10.5px; font-style: normal; font-weight: 400; line-height: 1.5; padding: 6px 10px; white-space: nowrap; max-width: 380px; overflow: hidden; text-overflow: ellipsis; pointer-events: none; opacity: 0; transform: translateY(-4px); transition: opacity 0.35s cubic-bezier(0.22,1,0.36,1), transform 0.35s cubic-bezier(0.22,1,0.36,1); z-index: 10; box-shadow: inset 0 1px 0 rgba(255,255,255,0.04), 0 2px 4px rgba(0,0,0,0.3), 0 4px 8px rgba(0,0,0,0.2); }
.bd pre [data-tip]:hover::after { opacity: 1; transform: translateY(0); }
.bd pre [data-tip].active { border-bottom-color: var(--l6); color: #fff !important; }
@keyframes hintPulse { 0% { border-bottom-color: transparent; } 20% { border-bottom-color: var(--l6); } 40% { border-bottom-color: transparent; } 60% { border-bottom-color: var(--l5); } 80% { border-bottom-color: transparent; } 100% { border-bottom-color: transparent; } }
.bd pre [data-tip].hint { animation: hintPulse 2.5s ease forwards; }

.viz-panel { overflow: hidden; height: 0; opacity: 0; background: var(--l1); border: 1px solid transparent; margin: 0; font-size: 11px; line-height: 1.7; color: var(--l8); transform-origin: top center; will-change: height, opacity; box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 2px 4px rgba(0,0,0,0.2), 0 4px 8px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.1); }
.viz-panel.open { border-color: var(--l3); border-top-color: rgba(255,255,255,0.06); margin: 0 0 1.5em 0; }
.viz-panel .viz-label { color: var(--l6); font-size: 10px; letter-spacing: 0.04em; margin-bottom: 10px; display: flex; justify-content: space-between; align-items: center; }
.viz-panel .viz-close { cursor: pointer; color: var(--l6); transition: color 0.2s; font-size: 11px; }
.viz-panel .viz-close:hover { color: var(--la); }
.viz-panel .viz-flow { color: var(--l9); white-space: pre; }
.viz-panel .viz-flow .arrow { color: var(--l6); }
.viz-panel .viz-flow .hl { color: var(--la); font-weight: 500; }
.viz-panel .viz-flow .dim { color: var(--l6); }
.viz-panel .viz-bar { display: flex; align-items: center; gap: 8px; margin: 4px 0; }
.viz-panel .viz-bar .bar { height: 6px; background: var(--l5); display: inline-block; }
.viz-panel .viz-bar .bar.fill { background: var(--l8); }
.viz-panel .viz-bar span { color: var(--l7); font-size: 10px; min-width: 80px; }

.callout { background: var(--l1); border: 1px solid var(--l3); border-top-color: rgba(255,255,255,0.06); border-bottom-color: rgba(0,0,0,0.3); border-left: 3px solid var(--l7); padding: 16px 20px; margin: 1.5em 0; font-size: 12.5px; color: #b0b0b0; line-height: 1.75; box-shadow: inset 0 1px 0 rgba(255,255,255,0.04), inset 0 -1px 0 rgba(0,0,0,0.15), 0 1px 2px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.08); }
.callout strong { color: var(--la); }

.pn { display: flex; justify-content: space-between; padding-top: 28px; margin-top: 56px; position: relative; }
.pn::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, var(--l5), transparent); }
.pn a { color: var(--l6); text-decoration: none; font-size: 12px; padding: 8px 14px; border: 1px solid transparent; transition: all 0.25s cubic-bezier(0.25,0.46,0.45,0.94); }
.pn a:hover { color: var(--la); border-color: var(--l4); background: var(--l1); box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 2px 4px rgba(0,0,0,0.15), 0 4px 8px rgba(0,0,0,0.1); transform: translateY(-2px); }

footer { position: relative; z-index: 1; padding: 20px 24px; max-width: var(--w); margin: 0 auto; font-size: 10px; color: var(--l6); }
footer::before { content: ''; display: block; height: 1px; background: linear-gradient(90deg, transparent, var(--l4), transparent); margin-bottom: 20px; }
footer a { color: var(--l7); text-decoration: none; }

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--l4); }
::selection { background: rgba(200,200,200,0.15); }

@media (max-width: 600px) { article { padding: 0 16px 64px; } .ph h1 { font-size: 20px; } }