/* Video Remix Studio — Study 01
   Design System: Cold cutting-table + amber signal
   Tokens: paper / ink / amber / graphite
   Type: Instrument Serif (display) / IBM Plex Sans (body/ui) / JetBrains Mono (timecode)
   Layout: 12-col Swiss grid, measure 680px
   Signature: Interactive timeline scrubber in hero (thesis)
*/
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=IBM+Plex+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --paper:#F7F7F5;
  --paper-2:#EDEDE9;
  --paper-3:#FFFFFF;
  --ink:#0E0E12;
  --ink-2:#23252B;
  --muted:#6B6F76;
  --faint:#9AA0A8;
  --hair:#E6E6E0;
  --hair-2:#D6D6D0;
  --amber:#FFB643;
  --amber-ink:#0E0E12;
  --amber-bg:#FFF4DB;
  --amber-border:#F1D08A;
  --graphite:#1A1D24;
  --graphite-2:#2D3040;
  --max:1160px;
  --measure:680px;
  --radius:12px;
  --radius-lg:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation:none!important;transition:none!important}}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:"IBM Plex Sans", system-ui, -apple-system, Segoe UI, sans-serif;
  font-size:17px;line-height:1.72;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:rgba(14,14,18,.22)}
a:hover{text-decoration-color:var(--ink)}
code{font-family:"JetBrains Mono",monospace;font-size:.84em;background:var(--paper-2);border:1px solid var(--hair);padding:.14em .36em;border-radius:6px;color:var(--ink-2)}
pre{margin:0;overflow:auto;background:var(--paper-2);border:1px solid var(--hair);border-radius:10px}
pre code{background:none;border:none;padding:0;color:var(--ink-2);font-size:.84em;line-height:1.65}
:focus-visible{outline:2px solid var(--amber);outline-offset:2px}

/* Progress */
.progress{position:fixed;top:0;left:0;height:2px;background:var(--amber);width:0;z-index:50;transition:width .08s linear}

/* System bar */
.sysbar{border-bottom:1px solid var(--hair);background:rgba(247,247,245,.88);backdrop-filter:blur(10px) saturate(1.05);position:sticky;top:0;z-index:30}
.sysbar-inner{max-width:var(--max);margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:16px;min-height:44px}
.sysbar-mark{font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);text-decoration:none;display:flex;align-items:center;gap:10px}
.sysbar-mark b{color:var(--ink);letter-spacing:.12em}
.sysbar-dot{width:7px;height:7px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 4px var(--amber-bg)}
.sysbar-nav{margin-left:auto;display:flex;gap:18px;font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.08em;text-transform:uppercase}
.sysbar-nav a{color:var(--muted);text-decoration:none;padding:6px 8px;border-radius:6px}
.sysbar-nav a:hover{color:var(--ink);background:var(--paper-2)}
.sysbar-nav a.active{color:var(--ink);background:var(--amber-bg);border:1px solid var(--amber-border)}
.sysbar-cta{font-family:"IBM Plex Sans",sans-serif;font-size:.78em;font-weight:600;background:var(--ink);color:white;text-decoration:none;padding:8px 12px;border-radius:999px;letter-spacing:.02em}
.sysbar-cta:hover{background:var(--ink-2);color:white}
.sysbar-burger{display:none;width:36px;height:36px;border:1px solid var(--hair);background:var(--paper-3);border-radius:8px}

/* Hero — thesis */
.hero{max-width:var(--max);margin:0 auto;padding:28px 24px 0}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:36px;align-items:start}
.kicker{display:inline-flex;align-items:center;gap:8px;font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.kicker i{font-style:normal;background:var(--amber);color:var(--amber-ink);padding:3px 7px;border-radius:999px;font-weight:500;letter-spacing:.08em}
.hero h1{font-family:"Instrument Serif", Georgia, serif;font-size:clamp(38px,5.2vw,56px);line-height:.95;letter-spacing:-.035em;margin:0 0 14px;font-weight:400}
.hero h1 em{font-style:italic;color:var(--ink-2)}
.hero-lead{font-size:1.08em;color:var(--ink-2);line-height:1.65;margin:0 0 18px;max-width:54ch}
.hero-lead strong{color:var(--ink);font-weight:600}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0 14px}
.btn{font-family:"IBM Plex Sans",sans-serif;font-size:.88em;font-weight:600;padding:10px 14px;border-radius:999px;border:1px solid transparent;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:8px;line-height:1}
.btn-primary{background:var(--ink);color:white}
.btn-primary:hover{background:var(--graphite);color:white}
.btn-ghost{background:var(--paper-3);border-color:var(--hair);color:var(--ink)}
.btn-ghost:hover{border-color:var(--hair-2);background:var(--paper-2)}
.hero-meta{font-family:"JetBrains Mono",monospace;font-size:.72em;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;align-items:center;border-top:1px solid var(--hair);padding-top:12px;margin-top:12px}
.hero-meta b{color:var(--ink);font-weight:500}

/* Thesis demo — film strip */
.thesis{border:1px solid var(--hair);background:var(--paper-3);border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 10px 30px rgba(14,14,18,.06)}
.thesis-head{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border-bottom:1px solid var(--hair);background:var(--paper-2);font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.thesis-head b{color:var(--ink);font-weight:500}
.thesis-head span{color:var(--amber);background:var(--amber-bg);border:1px solid var(--amber-border);padding:3px 7px;border-radius:999px}
.thesis-track{position:relative;padding:14px 12px 10px;background:var(--paper-3)}
.strip{position:relative;height:84px;background:var(--graphite);border-radius:8px;overflow:hidden;display:flex;align-items:center;gap:2px;padding:6px;border:1px solid #111}
.strip::before,.strip::after{content:"";position:absolute;left:6px;right:6px;height:8px;background:repeating-linear-gradient(90deg, transparent 0 12px, rgba(255,255,255,.9) 12px 18px);opacity:.9}
.strip::before{top:6px}.strip::after{bottom:6px}
.cell{flex:1;height:46px;border-radius:4px;position:relative;overflow:hidden;background:#2a2d3a}
.cell::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(255,255,255,.06), transparent)}
.cell.s1{background:linear-gradient(135deg,#3a3f55,#5b647c)} .cell.s2{background:linear-gradient(135deg,#4a3b5a,#7a5a6b)} .cell.s3{background:linear-gradient(135deg,#2e4a5a,#5a7a8a)} .cell.s4{background:linear-gradient(135deg,#3f4a3a,#6a7a5a)} .cell.s5{background:linear-gradient(135deg,#4a3a3a,#7a5a5a)} .cell.s6{background:linear-gradient(135deg,#3a435a,#6a7a95)}
.beats{position:absolute;inset:6px 6px 6px 6px;display:flex;justify-content:space-between;align-items:center;pointer-events:none}
.beat{width:2px;height:56px;background:var(--amber);opacity:.95;box-shadow:0 0 0 2px rgba(255,182,67,.22)}
.beat.drop{height:68px;width:3px;box-shadow:0 0 0 3px rgba(255,182,67,.28)}
.beat small{position:absolute;top:-14px;transform:translateX(-50%);font-family:"JetBrains Mono",monospace;font-size:.62em;color:var(--muted);letter-spacing:.06em}
.playhead{position:absolute;top:6px;bottom:6px;width:2px;background:white;box-shadow:0 0 0 4px rgba(255,255,255,.18);border-radius:999px;cursor:ew-resize;touch-action:none}
.playhead::before{content:"";position:absolute;top:-6px;left:50%;transform:translateX(-50%);width:14px;height:14px;background:white;border:2px solid var(--ink);border-radius:50%}
.playhead::after{content:"00:07.2";position:absolute;top:-26px;left:50%;transform:translateX(-50%);font-family:"JetBrains Mono",monospace;font-size:.62em;background:var(--ink);color:white;padding:2px 6px;border-radius:999px;white-space:nowrap}
.thesis-foot{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-top:1px solid var(--hair);background:var(--paper-2);font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted)}
.thesis-foot b{color:var(--ink)}
.scrub{flex:1;margin:0 10px;height:4px;background:var(--hair);border-radius:999px;position:relative;overflow:hidden}
.scrub i{position:absolute;left:0;top:0;bottom:0;width:38%;background:var(--amber);border-radius:999px}

/* Proof bar */
.proof{max-width:var(--max);margin:18px auto 0;padding:0 24px}
.proof-inner{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;display:grid;grid-template-columns:repeat(5,1fr);gap:0;overflow:hidden}
.proof-item{padding:12px 14px;text-align:left;border-right:1px solid var(--hair)}
.proof-item:last-child{border-right:none}
.proof-item b{font-family:"Instrument Serif",serif;font-size:1.6em;line-height:1;font-weight:400;letter-spacing:-.02em}
.proof-item span{display:block;font-family:"JetBrains Mono",monospace;font-size:.62em;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:4px;line-height:1.3}

/* Layout with sidebar */
.layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:32px;max-width:var(--max);margin:0 auto;padding:0 24px;align-items:start}
.sidebar{position:sticky;top:56px;align-self:start;padding:24px 0}
.sidebar-sticky{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;overflow:hidden}
.sidebar-head{font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:10px 12px;border-bottom:1px solid var(--hair);display:flex;justify-content:space-between;align-items:center;background:var(--paper-2)}
.sidebar-head span{color:var(--faint)}
.toc-side{display:flex;flex-direction:column}
.toc-side a{display:flex;align-items:center;gap:8px;padding:8px 12px;text-decoration:none;color:var(--ink-2);font-size:.84em;border-bottom:1px solid var(--hair);line-height:1.3}
.toc-side a:last-child{border-bottom:none}
.toc-side a:hover{background:var(--paper-2);color:var(--ink)}
.toc-side a.active{background:var(--amber-bg);color:var(--ink);border-left:3px solid var(--amber);padding-left:9px}
.toc-side i{font-style:normal;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted);background:var(--paper-2);border:1px solid var(--hair);padding:2px 5px;border-radius:6px;min-width:26px;text-align:center}
.toc-side a.active i{background:var(--amber);color:var(--amber-ink);border-color:var(--amber)}
.sidebar-foot{font-family:"JetBrains Mono",monospace;font-size:.62em;color:var(--faint);padding:8px 12px;background:var(--paper-2);border-top:1px solid var(--hair);line-height:1.4}
/* Page shell */
.page{max-width:none;margin:0;min-width:0}

/* Prose */
.prose{max-width:var(--measure);margin:0 auto;padding:8px 0 0}
.chapter{padding:44px 0 36px;border-bottom:1px solid var(--hair)}
.chapter:last-of-type{border-bottom:none}
.kicker{font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.kicker::before{content:"";width:18px;height:1px;background:var(--hair-2)}
.chapter h2{font-family:"Instrument Serif",serif;font-size:2em;line-height:1.05;letter-spacing:-.03em;margin:0 0 12px;font-weight:400}
.chapter h3{font-family:"Instrument Serif",serif;font-size:1.18em;letter-spacing:-.02em;margin:26px 0 8px;font-weight:400}
.chapter p{margin:0 0 12px;color:var(--ink-2)}
.chapter ul,.chapter ol{margin:0 0 12px 20px;color:var(--ink-2)}
.chapter li{margin:4px 0}
.dropcap::first-letter{font-family:"Instrument Serif",serif;float:left;font-size:3.2em;line-height:.82;padding:6px 8px 0 0;color:var(--ink);font-weight:400}

/* Callout */
.callout{margin:16px 0;padding:12px 14px;background:var(--paper-2);border:1px solid var(--hair);border-left:3px solid var(--amber);border-radius:0 10px 10px 0}
.callout-label{font-family:"JetBrains Mono",monospace;font-size:.62em;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.callout p{margin:0;font-size:.92em;color:var(--ink-2)}
.callout.warn{background:var(--amber-bg);border-left-color:var(--amber);border-color:var(--amber-border)}

/* Quote */
blockquote{margin:16px 0;padding:14px 16px 14px 18px;border-left:2px solid var(--ink);background:var(--paper-2);border-radius:0 10px 10px 0;font-style:italic;color:var(--ink-2)}

/* Tables */
.table-figure{margin:16px 0}
.table-figure table{width:100%;border-collapse:collapse;font-family:"IBM Plex Sans",sans-serif;font-size:.82em;background:var(--paper-3);border:1px solid var(--hair);border-radius:10px;overflow:hidden}
.table-figure.wide{margin-left:-24px;margin-right:-24px}
.table-figure.wide table{border-radius:0}
.table-figure th{text-align:left;font-weight:600;font-size:.72em;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--paper-2);padding:9px 12px;border-bottom:1px solid var(--hair);white-space:nowrap}
.table-figure td{padding:8px 12px;border-bottom:1px solid var(--hair);vertical-align:top;color:var(--ink-2)}
.table-figure tr:last-child td{border-bottom:none}
.table-figure figcaption{margin-top:6px;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted)}

/* Two col */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}
.col-card{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;padding:14px 16px}
.col-card.accent{border-color:var(--amber-border);background:var(--amber-bg)}
.col-card h3{margin:4px 0 2px;font-family:"Instrument Serif",serif;font-weight:400}
.col-sub{font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
.badge{font-family:"JetBrains Mono",monospace;font-size:.62em;letter-spacing:.08em;text-transform:uppercase;background:var(--paper-2);border:1px solid var(--hair);padding:3px 7px;border-radius:999px;color:var(--muted)}
.badge.amber{background:var(--amber);color:var(--amber-ink);border-color:var(--amber)}
.col-card ol{margin:6px 0 0 18px;padding:0}
.col-card ol li{margin:3px 0;font-size:.88em}
.col-foot{margin-top:10px;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted);border-top:1px dashed var(--hair);padding-top:8px}

/* Diagram */
.diagram-figure{margin:16px 0}
.diagram{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;padding:14px}
.diagram-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center;font-family:"JetBrains Mono",monospace;font-size:.72em;margin:6px 0}
.d-node{border:1px solid var(--hair);background:var(--paper);padding:6px 10px;border-radius:999px;white-space:nowrap}
.d-node.muted{color:var(--muted);background:var(--paper-2)}
.d-node.emphasis{border-color:var(--amber-border);background:var(--amber-bg);color:var(--ink);font-weight:600}
.d-node.final{background:var(--ink);color:white;border-color:var(--ink)}
.diagram-loop{text-align:center;margin-top:10px;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted)}

/* Stack */
.stack-dl{margin:12px 0 0}
.stack-dl dt{font-family:"IBM Plex Sans",sans-serif;font-weight:600;font-size:.88em;margin-top:12px}
.stack-dl dt:first-child{margin-top:0}
.stack-dl dd{margin:2px 0 0 0;font-size:.92em;color:var(--muted);padding-left:12px;border-left:2px solid var(--hair)}

/* Steps */
.steps{list-style:none;padding:0;margin:14px 0}
.step{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--hair)}
.step:last-child{border-bottom:none}
.step-n{width:28px;height:28px;display:grid;place-items:center;background:var(--ink);color:white;border-radius:50%;font-family:"JetBrains Mono",monospace;font-size:.74em;flex-shrink:0;margin-top:2px}
.step h3{margin:0 0 4px;font-family:"Instrument Serif",serif;font-weight:400}
.step p{margin:0 0 8px}
.step pre{background:var(--paper-2);border:1px solid var(--hair);border-radius:8px;padding:10px 12px;font-size:.84em}

/* Code */
.code-figure{margin:16px 0}
.code-figure figcaption{font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted);margin-bottom:6px}
.code-figure pre{background:#0E0E12;border-radius:10px;padding:14px 16px;border:1px solid #1A1D24}
.code-figure pre code{color:#E6E6E0}

/* Agent */
.agent{padding:14px 0;border-bottom:1px solid var(--hair)}
.agent:last-of-type{border-bottom:none}
.agent.featured{background:var(--amber-bg);border:1px solid var(--amber-border);border-radius:12px;padding:14px 16px;margin:8px 0}
.agent-header{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.agent-num{width:24px;height:24px;display:grid;place-items:center;background:var(--ink);color:white;border-radius:50%;font-family:"JetBrains Mono",monospace;font-size:.72em;flex-shrink:0}
.agent.featured .agent-num{background:var(--amber);color:var(--amber-ink)}
.agent-header h3{margin:0;font-family:"Instrument Serif",serif;font-weight:400;font-size:1em}
.agent-model{margin-left:auto;font-family:"JetBrains Mono",monospace;font-size:.68em;background:var(--paper-2);border:1px solid var(--hair);padding:3px 7px;border-radius:999px;color:var(--muted)}
.agent p{margin:0 0 6px;font-size:.92em}
.agent-io{display:flex;gap:8px;flex-wrap:wrap;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted)}
.agent-io span{background:var(--paper-2);border:1px solid var(--hair);padding:3px 7px;border-radius:999px}

/* Defs */
.def-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:14px 0}
.def{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;padding:14px 16px}
.def h3{margin:0 0 6px;font-family:"Instrument Serif",serif;font-weight:400;font-size:.96em}
.def p{margin:0 0 6px;font-size:.88em;color:var(--muted)}
.def ul{margin:0 0 0 18px;font-size:.88em}
.mono{font-family:"JetBrains Mono",monospace;font-size:.84em}

/* Modes / Paliers */
.mode-list{display:flex;flex-direction:column;gap:12px;margin:14px 0}
.mode{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;padding:16px}
.mode.recommended{border-color:var(--amber-border);background:var(--amber-bg)}
.mode-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.mode-letter{width:26px;height:26px;display:grid;place-items:center;background:var(--ink);color:white;border-radius:50%;font-family:"JetBrains Mono",monospace;font-size:.74em}
.mode.recommended .mode-letter{background:var(--amber);color:var(--amber-ink)}
.mode-head h3{margin:0;font-family:"Instrument Serif",serif;font-weight:400}
.mode p{margin:0 0 6px;font-size:.92em;color:var(--ink-2)}
.mode-when{font-family:"JetBrains Mono",monospace;font-size:.72em;color:var(--muted);background:var(--paper-2);border:1px dashed var(--hair);padding:6px 10px;border-radius:8px;margin-top:6px}
.palier-list{display:flex;flex-direction:column;gap:12px;margin:16px 0;padding-left:18px;border-left:1px solid var(--hair)}
.palier{display:flex;gap:12px}
.palier-n{width:26px;height:26px;display:grid;place-items:center;background:var(--amber);color:var(--amber-ink);border-radius:50%;font-family:"JetBrains Mono",monospace;font-size:.74em;flex-shrink:0;position:relative;left:-30px;margin-right:-26px;border:2px solid var(--paper)}
.palier-body{flex:1;border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;padding:12px 14px}
.palier-body h3{margin:0 0 4px;font-family:"Instrument Serif",serif;font-weight:400;font-size:.96em}
.pill{font-family:"JetBrains Mono",monospace;font-size:.62em;letter-spacing:.06em;text-transform:uppercase;background:var(--amber-bg);border:1px solid var(--amber-border);color:var(--ink);padding:2px 7px;border-radius:999px;white-space:nowrap}

/* Gallery — film perforations */
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:12px 0 0}
.gallery-empty{grid-column:1/-1;font-family:"JetBrains Mono",monospace;font-size:.82em;color:var(--muted);background:var(--paper-2);border:1px dashed var(--hair);padding:22px;border-radius:12px;text-align:center}
.video-card{border:1px solid var(--hair);background:var(--paper-3);border-radius:12px;overflow:hidden;transition:transform .16s ease, box-shadow .16s ease, border-color .16s ease}
.video-card:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(14,14,18,.08);border-color:var(--hair-2)}
.video-wrap{position:relative;background:#0A0A0C;aspect-ratio:9/16;max-height:520px;display:grid;place-items:center;overflow:hidden}
.video-wrap::before,.video-wrap::after{content:"";position:absolute;left:0;right:0;height:10px;background:repeating-linear-gradient(90deg, transparent 0 14px, rgba(255,255,255,.92) 14px 22px);opacity:.9;z-index:1;pointer-events:none}
.video-wrap::before{top:6px}.video-wrap::after{bottom:6px}
.video-wrap video{width:100%;height:100%;object-fit:cover;display:block;background:#0A0A0C}
.video-play{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg, transparent 40%, rgba(0,0,0,.42));opacity:0;transition:opacity .16s ease;z-index:2}
.video-card:hover .video-play{opacity:1}
.video-play span{width:44px;height:44px;display:grid;place-items:center;background:rgba(255,255,255,.96);color:var(--ink);border-radius:50%;font-size:13px;box-shadow:0 4px 14px rgba(0,0,0,.18)}
.video-card figcaption{padding:11px 12px 12px;border-top:1px solid var(--hair);background:var(--paper-3)}
.video-kicker{font-family:"JetBrains Mono",monospace;font-size:.62em;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.video-title{font-family:"Instrument Serif",serif;font-size:1.02em;line-height:1.2;margin-top:2px}
.video-meta{font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted);margin-top:6px;display:flex;gap:8px;flex-wrap:wrap}
.meta-dot{width:3px;height:3px;background:var(--faint);border-radius:50%;display:inline-block;align-self:center}
/* FAQ — dropdown */
.faq{display:flex;flex-direction:column;gap:8px;margin:14px 0}
.faq details{border:1px solid var(--hair);background:var(--paper-3);border-radius:10px;overflow:hidden}
.faq details[open]{border-color:var(--hair-2);box-shadow:0 4px 14px rgba(14,14,18,.06)}
.faq summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;cursor:pointer;font-weight:600;font-size:.94em;color:var(--ink-2)}
.faq summary::-webkit-details-marker{display:none}
.faq summary span{flex:1}
.faq summary i{font-style:normal;width:24px;height:24px;display:grid;place-items:center;border:1px solid var(--hair);background:var(--paper-2);border-radius:50%;font-size:12px;line-height:1;color:var(--muted);transition:transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;flex-shrink:0}
.faq details[open] summary i{transform:rotate(45deg);background:var(--ink);color:white;border-color:var(--ink)}
.faq details p{margin:0;padding:0 14px 12px;color:var(--muted);font-size:.92em;line-height:1.6;border-top:1px dashed var(--hair);padding-top:10px;margin-top:2px}
.lightbox{position:fixed;inset:0;background:rgba(14,14,18,.92);display:none;place-items:center;z-index:50;padding:24px}
.lightbox.open{display:grid}
.lightbox-inner{width:min(520px,90vw);max-height:90vh;display:flex;flex-direction:column;gap:10px}
.lightbox video{width:100%;max-height:82vh;border-radius:12px;background:black}
.lightbox-bar{display:flex;justify-content:space-between;align-items:center;color:#E6E6E0;font-family:"JetBrains Mono",monospace;font-size:.82em}
.lightbox-close{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.18);color:white;padding:6px 10px;border-radius:999px;cursor:pointer}
.sep{border:none;border-top:1px solid var(--hair);margin:0}
.outro{text-align:center;padding:36px 0 10px}
.outro-kicker{font-family:"JetBrains Mono",monospace;font-size:.68em;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.outro h2{font-family:"Instrument Serif",serif;font-size:1.7em;letter-spacing:-.02em;margin:6px 0 8px;font-weight:400}
.outro p{color:var(--muted);max-width:56ch;margin:0 auto 8px}
.footer{border-top:1px solid var(--hair);margin-top:32px;padding:16px 24px;background:var(--paper-2)}
.footer-inner{max-width:var(--max);margin:0 auto;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;font-family:"JetBrains Mono",monospace;font-size:.68em;color:var(--muted)}
@media(max-width:980px){.hero-grid{grid-template-columns:1fr}.proof-inner{grid-template-columns:repeat(3,1fr)}.two-col,.def-grid{grid-template-columns:1fr}.table-figure.wide{margin-left:0;margin-right:0}.layout{grid-template-columns:1fr;gap:0}.sidebar{position:static;padding:12px 0}.sidebar-sticky{border-radius:12px}}
@media(max-width:640px){.sysbar-nav{display:none}.hero{padding:22px 18px 0}.proof{padding:0 18px}.proof-inner{grid-template-columns:repeat(2,1fr)}.layout{padding:0 18px}.page{padding:0}.chapter{padding:32px 0 28px}.gallery{grid-template-columns:1fr}}