/* ============================================================
   craftagent — "Operator's Notebook" editorial-engineering system
   Light = warm paper · Dark = 2am terminal · Accent = signal vermilion
   ============================================================ */

@font-face{font-family:'Be Vietnam Pro';src:url('/fonts/BeVietnamPro-Regular.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'Be Vietnam Pro';src:url('/fonts/BeVietnamPro-SemiBold.ttf') format('truetype');font-weight:600;font-display:swap}
@font-face{font-family:'Be Vietnam Pro';src:url('/fonts/BeVietnamPro-Bold.ttf') format('truetype');font-weight:700;font-display:swap}

:root{
  --serif:'Spectral',Georgia,serif;
  --sans:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1180px;
  --read:720px;
  --rail:300px;          /* reading-page navigator-spine column */
  --gap:64px;            /* spine → article gutter */
}

/* ---- LIGHT (default) ---- */
:root,[data-theme="light"]{
  --paper:#FBF8F1; --paper-2:#F4EEE1; --raise:#FFFFFF;
  --ink:#1A1714; --ink-soft:#4E463D; --ink-mute:#94897A;
  --line:#E7DDCB; --line-2:#D9CDB6;
  --accent:#D9461F; --accent-2:#B6381456; --accent-ink:#B23A18; --wash:#F8E7DB;
  --good:#157F5B; --good-bg:#E6F2EB; --good-line:#BFE0CE;
  --alert:#C0382B; --alert-bg:#FBEAE7; --alert-line:#F0CFC9;
  --shadow:0 1px 2px rgba(40,28,12,.05),0 12px 34px rgba(60,40,16,.07);
  --shadow-sm:0 1px 2px rgba(40,28,12,.05),0 4px 14px rgba(60,40,16,.06);
  --shadow-lg:0 2px 6px rgba(40,28,12,.06),0 28px 60px rgba(60,40,16,.12);
  --grid:rgba(110,90,60,.09);
  --grain:.035;
}
/* ---- DARK ---- */
[data-theme="dark"]{
  --paper:#121110; --paper-2:#1A1814; --raise:#201D18;
  --ink:#F1EBDF; --ink-soft:#C2B9A8; --ink-mute:#857C6E;
  --line:#2C2922; --line-2:#3B362D;
  --accent:#FF6A3D; --accent-ink:#FF8A63; --wash:#2A2018;
  --good:#3CC98A; --good-bg:#16241D; --good-line:#27402F;
  --alert:#FF6B5A; --alert-bg:#2A1815; --alert-line:#43241F;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 40px rgba(0,0,0,.45);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4),0 6px 18px rgba(0,0,0,.4);
  --shadow-lg:0 2px 8px rgba(0,0,0,.5),0 34px 70px rgba(0,0,0,.6);
  --grid:rgba(190,170,130,.06);
  --grain:.05;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:400 20px/1.72 var(--serif);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .4s ease,color .4s ease;
  overflow-x:hidden;
}
/* paper grain texture */
body::before{
  content:"";position:fixed;inset:0;z-index:9999;pointer-events:none;
  opacity:var(--grain);mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
[data-theme="dark"] body::before{mix-blend-mode:screen}
::selection{background:var(--accent);color:#fff}
/* theme-scoped body rule forces a clean repaint on data-theme toggle */
[data-theme="light"] body{background:var(--paper);color:var(--ink)}
[data-theme="dark"] body{background:var(--paper);color:var(--ink)}
a{color:var(--accent);text-decoration:none}
.sans{font-family:var(--sans)}.mono{font-family:var(--mono)}

/* ── kicker / eyebrow ─────────────────────────── */
.kick{font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);display:inline-flex;align-items:center;gap:.6em}
.kick::before{content:"";width:18px;height:1.5px;background:var(--accent);display:inline-block}
.kick.nofold::before{display:none}

/* ============ NAV ============ */
.nav{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--paper) 86%,transparent);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.nav-in{max-width:var(--maxw);margin:0 auto;padding:14px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{font-family:var(--sans);font-weight:800;font-size:19px;letter-spacing:-.04em;color:var(--ink);display:inline-flex;align-items:center;gap:9px;cursor:pointer}
.brand .dot{width:11px;height:11px;border-radius:3px;background:var(--accent);box-shadow:0 0 0 3px var(--wash);transform:rotate(45deg)}
.brand b{color:var(--accent);font-weight:800}
.nav-r{display:flex;align-items:center;gap:14px}
.nav-link{font-family:var(--sans);font-size:14px;font-weight:600;color:var(--ink-mute);cursor:pointer}
.nav-link:hover{color:var(--ink)}
/* ── index popover ("Mục lục") ── */
.navmenu{position:relative;display:inline-flex}
.nm-btn{font-family:var(--sans);font-size:14px;font-weight:600;color:var(--ink-mute);display:inline-flex;align-items:center;gap:5px;background:none;border:0;padding:0;cursor:pointer}
.nm-btn:hover{color:var(--ink)}
.nm-car{color:var(--ink-mute);transition:transform .2s}
.nm-btn[aria-expanded="true"] .nm-car{transform:rotate(180deg)}
.navmenu-panel{position:absolute;top:calc(100% + 12px);right:0;width:330px;max-width:calc(100vw - 32px);background:var(--raise);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:10px;z-index:80;display:flex;flex-direction:column;gap:1px}
.navmenu-panel[hidden]{display:none}
.nm-head{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-mute);display:flex;justify-content:space-between;align-items:center;gap:14px;padding:6px 10px 10px}
.nm-item{display:flex;gap:12px;align-items:flex-start;padding:9px 10px;border-radius:10px;transition:background .15s}
.nm-item:hover,.nm-item.on{background:var(--wash)}
.nm-no{flex:0 0 auto;width:24px;height:24px;border-radius:7px;background:var(--paper-2);border:1px solid var(--line);display:grid;place-items:center;font-family:var(--mono);font-size:12px;color:var(--ink-mute)}
.nm-item.on .nm-no{background:var(--accent);border-color:var(--accent);color:#fff}
.nm-tx{display:flex;flex-direction:column;gap:2px;min-width:0}
.nm-tx b{font-family:var(--serif);font-weight:500;font-size:15px;line-height:1.25;letter-spacing:-.01em;color:var(--ink)}
.nm-tx span{font-family:var(--mono);font-size:10px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-mute)}
.nm-all{font-family:var(--sans);font-size:13px;font-weight:600;color:var(--accent);text-decoration:none;padding:11px 10px 6px;margin-top:4px;border-top:1px solid var(--line)}
.nm-all:hover{color:var(--ink)}

/* segmented toggles */
.seg{display:inline-flex;align-items:center;background:var(--paper-2);border:1px solid var(--line);border-radius:999px;padding:3px}
.seg button{font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.05em;border:0;background:transparent;color:var(--ink-mute);padding:5px 11px;border-radius:999px;cursor:pointer;transition:color .2s}
.seg button.on{background:var(--ink);color:var(--paper)}
.seg.accent button.on{background:var(--accent);color:#fff}
.iconbtn{width:36px;height:36px;border-radius:999px;border:1px solid var(--line);background:var(--paper-2);color:var(--ink);display:grid;place-items:center;cursor:pointer;transition:transform .25s,border-color .2s}
.iconbtn:hover{border-color:var(--accent);transform:rotate(12deg)}
.iconbtn svg{width:17px;height:17px}

/* ── reading progress ── */
.progress{position:fixed;top:0;left:0;height:3px;background:var(--accent);z-index:70;width:0;transition:width .08s linear}

/* ============ LANDING / HERO ============ */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.hero{position:relative;padding:74px 32px 30px;max-width:var(--maxw);margin:0 auto}
.hero-grid{display:grid;grid-template-columns:1.05fr .9fr;gap:50px;align-items:start}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(42px,6vw,78px);line-height:1.02;letter-spacing:-.025em;margin:20px 0 0;text-wrap:balance;color:var(--ink)}
.hero h1 em{font-style:italic;color:var(--accent)}
.hero .lede{font-family:var(--serif);font-size:22px;line-height:1.55;color:var(--ink-soft);max-width:42ch;margin:26px 0 0}
.hero-cta{display:flex;align-items:center;gap:16px;margin-top:34px;flex-wrap:wrap}
.btn{font-family:var(--sans);font-weight:700;font-size:15px;padding:14px 26px;border-radius:999px;cursor:pointer;border:1px solid transparent;display:inline-flex;align-items:center;gap:9px;text-decoration:none;transition:transform .2s,background .2s,box-shadow .2s,border-color .2s,color .2s}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn .arr{transition:transform .2s}.btn:hover .arr{transform:translateX(4px)}

/* hero diagram card */
.hero-art{background:var(--raise);border:1px solid var(--line);border-radius:18px;padding:30px 26px 26px;box-shadow:var(--shadow);position:relative;overflow:hidden;margin-top:46px}
.hero-art .tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--ink-mute);text-transform:uppercase;margin-bottom:20px;display:flex;justify-content:space-between}
.hero-art .tag .blink{color:var(--accent)}

/* manifesto strip */
.manifesto{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:56px;background:var(--paper-2)}
.manifesto-in{max-width:var(--maxw);margin:0 auto;padding:56px 32px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:30px}
.manifesto .m-lead{grid-column:1/-1;font-family:var(--serif);font-size:clamp(26px,3.2vw,38px);line-height:1.3;letter-spacing:-.02em;max-width:24ch;margin:0 0 14px;text-wrap:balance}
.manifesto .m-lead b{color:var(--accent);font-weight:500;font-style:italic}
.m-col h4{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0 0 10px;font-weight:600}
.m-col p{font-family:var(--sans);font-size:14.5px;line-height:1.65;color:var(--ink-soft);margin:0}

/* ============ CATALOG ============ */
.catalog{max-width:var(--maxw);margin:0 auto;padding:64px 32px 30px}
.cat-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;border-bottom:2px solid var(--ink);padding-bottom:16px;margin-bottom:34px}
.cat-head h2{font-family:var(--serif);font-weight:500;font-size:34px;letter-spacing:-.02em;margin:8px 0 0}
.cat-head .meta{font-family:var(--mono);font-size:12px;color:var(--ink-mute);letter-spacing:.06em}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{position:relative;background:var(--raise);border:1px solid var(--line);border-radius:16px;padding:26px 26px 22px;display:flex;flex-direction:column;cursor:pointer;overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s}
.card::after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);transform:scaleY(0);transform-origin:top;transition:transform .28s ease}
.card:hover{transform:translateY(-3px);border-color:var(--line-2);box-shadow:var(--shadow)}
.card:hover::after{transform:scaleY(1)}
.card.feat{grid-column:1/-1;display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:center;padding:32px}
.card .c-kick{font-family:var(--mono);font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-mute);font-weight:600;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card .c-kick .num{color:var(--accent)}
.card.feat .c-kick{color:var(--accent)}
.card h3{font-family:var(--serif);font-weight:500;font-size:23px;line-height:1.2;letter-spacing:-.015em;margin:0 0 10px}
.card.feat h3{font-size:clamp(28px,3vw,40px);line-height:1.08}
.card p{font-family:var(--sans);font-size:14px;line-height:1.6;color:var(--ink-soft);margin:0 0 18px;flex:1}
.card .c-foot{display:flex;align-items:center;gap:12px;font-family:var(--sans);font-size:13px;font-weight:600;color:var(--ink-mute)}
.card .c-foot .go{color:var(--accent);display:inline-flex;align-items:center;gap:5px}
.card .c-foot .go .arr{transition:transform .2s}
.card:hover .c-foot .go .arr{transform:translateX(3px)}
.card .feat-art{align-self:stretch;display:flex;align-items:center}

/* ============ READING — Navigator Spine (2-col: navigator | article) ============ */
.shell{max-width:var(--maxw);margin:0 auto;padding:0 32px;display:grid;grid-template-columns:var(--rail) minmax(0,1fr);gap:0 var(--gap);align-items:start}

/* navigator spine (left) — cluster position + in-piece TOC, unified */
.nav-spine{position:sticky;top:78px;align-self:start;min-width:0;padding-top:52px;max-height:calc(100vh - 78px);overflow:auto;scrollbar-width:thin;scrollbar-color:var(--line-2) transparent}
.sp-piece .ptx,.sp-toc a,.sp-cluster h2{overflow-wrap:anywhere}
.nav-spine::-webkit-scrollbar{width:6px}
.nav-spine::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:6px}
.sp-cluster{display:flex;flex-direction:column;gap:4px;margin-bottom:18px}
.sp-cluster .badge{display:inline-flex;align-items:center;gap:9px}
.sp-cluster .badge .n{font-family:var(--serif);font-style:italic;font-weight:500;font-size:34px;line-height:.8;color:var(--accent);letter-spacing:-.03em}
.sp-cluster .badge .of{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-mute)}
.sp-cluster h2{font-family:var(--serif);font-weight:500;font-size:20px;line-height:1.15;letter-spacing:-.015em;margin:8px 0 0;color:var(--ink)}
.sp-cluster .meta{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-mute);margin-top:4px}
.sp-pieces{display:flex;flex-direction:column;border-left:2px solid var(--line);margin:6px 0 4px}
.sp-piece{position:relative;display:flex;gap:11px;align-items:baseline;padding:8px 0 8px 16px;margin-left:-2px;border-left:2px solid transparent;text-decoration:none;transition:border-color .2s}
.sp-piece .pno{flex:0 0 auto;font-family:var(--mono);font-size:11.5px;color:var(--ink-mute);transition:color .2s}
.sp-piece .ptx{font-family:var(--sans);font-size:12.5px;line-height:1.4;color:var(--ink-mute);transition:color .2s}
.sp-piece:hover .pno,.sp-piece:hover .ptx{color:var(--ink)}
.sp-piece.on{border-left-color:var(--accent)}
.sp-piece.on .pno{color:var(--accent)}
.sp-piece.on .ptx{color:var(--accent);font-weight:600}
.sp-div{display:flex;align-items:center;gap:10px;margin:20px 0 12px}
.sp-div .ln{flex:1;height:1px;background:var(--line)}
.sp-div .lbl{flex:0 0 auto;font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-mute)}
.sp-toc{display:flex;flex-direction:column;border-left:2px solid var(--line)}
.sp-toc a{display:block;font-family:var(--sans);font-size:13px;line-height:1.4;color:var(--ink-mute);padding:7px 0 7px 16px;margin-left:-2px;border-left:2px solid transparent;transition:color .2s,border-color .2s;text-decoration:none}
.sp-toc a:hover{color:var(--ink)}
.sp-toc a.active{color:var(--accent);border-color:var(--accent);font-weight:600}
.sp-back{display:inline-flex;align-items:center;gap:7px;margin-top:26px;font-family:var(--sans);font-size:12.5px;font-weight:600;color:var(--ink-mute);text-decoration:none}
.sp-back:hover{color:var(--accent)}
.sp-back svg{width:14px;height:14px}

/* article column (right) — threaded vermilion spine on its left edge */
.col{justify-self:center;width:100%;min-width:0;max-width:var(--read);position:relative}
.col::before{content:"";position:absolute;left:-1px;top:0;bottom:0;width:2px;background:var(--line);opacity:0}
[data-layout="spine"] .col{padding-left:34px}
[data-layout="spine"] .col::before{opacity:1;background:linear-gradient(180deg,var(--accent) 0,color-mix(in srgb,var(--accent) 35%,var(--line)) 12%,var(--line) 22%,var(--line) 100%)}

/* dossier masthead — one header system */
.head{padding:52px 0 0}
.head .idstrip{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:18px;margin-bottom:24px;border-bottom:1px solid var(--line)}
.head .idstrip .left{display:inline-flex;align-items:center;gap:11px}
.head .idstrip .cpip{width:25px;height:25px;border-radius:7px;background:var(--accent);color:#fff;font-family:var(--mono);font-size:12px;font-weight:600;display:grid;place-items:center}
.head .idstrip .ctitle{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);font-weight:500}
.head .idstrip .ctitle a{color:inherit;text-decoration:none}
.head .idstrip .ctitle a:hover{color:var(--accent)}
.head .idstrip .role{display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:600}
.head .idstrip .role .star{font-size:13px}
.head h1{font-family:var(--serif);font-weight:500;font-size:clamp(34px,4.4vw,52px);line-height:1.05;letter-spacing:-.025em;margin:0;text-wrap:balance;color:var(--ink)}
.head .dek{font-family:var(--serif);font-style:italic;font-size:22px;line-height:1.45;color:var(--ink-soft);margin:18px 0 0;max-width:40ch;text-wrap:pretty}
.metabar{display:flex;align-items:center;gap:0;margin:28px 0 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.metabar .cell{flex:1;padding:13px 0;display:flex;flex-direction:column;gap:3px;border-right:1px solid var(--line)}
.metabar .cell:last-child{border-right:0}
.metabar .cell .k{font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-mute)}
.metabar .cell .v{font-family:var(--sans);font-size:13.5px;font-weight:600;color:var(--ink)}
.metabar .cell .v a{color:var(--accent);font-weight:600}
.metabar .cell .v a:hover{text-decoration:underline}
.abstract{margin:26px 0 0;background:var(--wash);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:0 14px 14px 0;padding:20px 24px;position:relative}
.abstract .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);font-weight:600;display:block;margin-bottom:9px}
.abstract p{font-family:var(--serif);font-style:italic;font-size:18.5px;line-height:1.55;color:var(--ink-soft);margin:0}
.abstract b,.abstract strong{font-style:normal;font-weight:600;color:var(--ink)}

article{max-width:var(--read);margin:0 auto}
article p{margin:0 0 26px;font-size:20px;line-height:1.74}
article h2{font-family:var(--serif);font-weight:500;font-size:30px;line-height:1.18;letter-spacing:-.02em;margin:54px 0 18px;scroll-margin-top:92px;position:relative;color:var(--ink)}
article h2 .h2n{font-family:var(--mono);font-style:normal;font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--accent);display:block;margin-bottom:8px}
/* default diamond (non-spine layouts) sits inline-left of the heading */
article h2::after{content:"";position:absolute;left:-26px;top:.36em;width:10px;height:10px;background:var(--accent);border-radius:2px;transform:rotate(45deg);opacity:.85}
/* spine layout: the diamond becomes a node punched onto the threaded spine */
[data-layout="spine"] article h2::before{content:"";position:absolute;left:-34px;top:.52em;width:11px;height:11px;background:var(--accent);border:2px solid var(--paper);border-radius:2px;transform:rotate(45deg);box-shadow:0 0 0 2px var(--accent)}
[data-layout="spine"] article h2::after{display:none}
article h3{font-family:var(--sans);font-weight:700;font-size:20px;margin:38px 0 12px}
article strong{font-weight:600;color:var(--ink)}
[data-theme="dark"] article strong{color:#fff}
article em{font-style:italic}
article a{border-bottom:1px solid var(--accent-ink);transition:background .2s}
article a:hover{background:var(--wash)}
article blockquote{margin:34px 0;padding:4px 0 4px 28px;border-left:3px solid var(--accent);font-family:var(--serif);font-style:italic;font-size:24px;line-height:1.45;color:var(--ink)}
article blockquote p{margin:0;font-size:24px}
article ul,article ol{margin:0 0 26px;padding-left:26px}
article li{margin:0 0 12px;line-height:1.6}article li::marker{color:var(--accent)}
article code{font-family:var(--mono);font-size:.82em;background:var(--paper-2);border:1px solid var(--line);padding:1px 6px;border-radius:5px;color:var(--accent-ink)}
article pre.code{background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:18px 20px;overflow-x:auto;font-family:var(--mono);font-size:13.5px;line-height:1.55;margin:30px 0}
article pre.code code{background:none;border:0;padding:0;color:var(--ink-soft)}
article hr{border:0;height:1px;background:var(--line);margin:48px 0}
/* caption after diagram */
.diagram + p{font-family:var(--sans);font-style:normal;text-align:center;font-size:14px;line-height:1.55;color:var(--ink-mute);max-width:54ch;margin:14px auto 30px}
.diagram + p em{font-style:italic}
/* the closing related-links paragraph (italic, after last hr) */
article hr + p{font-family:var(--sans);font-size:15px;line-height:1.85;color:var(--ink-soft);background:var(--paper-2);border:1px solid var(--line);border-radius:14px;padding:20px 24px}
article hr + p em{font-style:normal}

/* end matter — one bordered unit: tag row, prev/next, author card */
.endmatter{margin:60px 0 0;border-top:2px solid var(--ink);padding-top:14px}
.endmatter .tag{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:26px}
.endmatter .tag .lbl{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.nextprev{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.np{background:var(--raise);border:1px solid var(--line);border-radius:14px;padding:18px 20px;cursor:pointer;text-decoration:none;display:block;transition:border-color .2s,transform .2s,box-shadow .2s}
.np:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.np .d{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-mute);margin-bottom:8px}
.np.next{text-align:right}
.np h5{font-family:var(--serif);font-weight:500;font-size:18px;line-height:1.2;margin:0;letter-spacing:-.01em;color:var(--ink)}
.np.disabled{opacity:.4;pointer-events:none}
/* author card — scoped to end matter; the home/map .author stays a band (rich.css) */
.endmatter .author{display:flex;gap:18px;align-items:center;margin-top:18px;max-width:none;padding:22px 24px;background:var(--paper-2);border:1px solid var(--line);border-radius:16px}
.endmatter .author .avatar{flex:0 0 auto;width:52px;height:52px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:var(--sans);font-weight:800;font-size:22px;border:0}
.endmatter .author .ab .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-mute);margin-bottom:5px}
.endmatter .author .ab p{font-family:var(--sans);font-size:14px;line-height:1.6;color:var(--ink-soft);margin:0;max-width:none}
.endmatter .author .ab b{color:var(--ink);font-weight:700}

/* ============ FOOTER ============ */
.foot{border-top:1px solid var(--line);margin-top:80px;background:var(--paper-2)}
.foot-in{max-width:var(--maxw);margin:0 auto;padding:50px 32px 64px;display:flex;justify-content:space-between;align-items:flex-end;gap:30px;flex-wrap:wrap}
.foot .brand{font-size:22px}
.foot p{font-family:var(--sans);font-size:13.5px;color:var(--ink-mute);margin:8px 0 0;max-width:40ch;line-height:1.6}
.foot .domain{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.05em}

/* ── scroll reveal ── */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s cubic-bezier(.2,.7,.2,1),transform .6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
/* failsafe: users who prefer less motion (or if JS reveal never fires) see everything */
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.001ms!important;animation-iteration-count:1!important}
}

/* page transition */
.page{animation:pageIn .45s cubic-bezier(.2,.7,.2,1) both}
@keyframes pageIn{from{transform:translateY(10px)}to{transform:none}}

/* ============ RESPONSIVE ============ */
@media(max-width:1080px){
  /* reading: collapse the 2-col spine; navigator becomes a card above the article */
  .shell{grid-template-columns:1fr;display:block;padding:0 28px}
  .nav-spine{position:static;max-height:none;overflow:visible;padding:22px;padding-top:22px;max-width:var(--read);margin:24px auto 0;border:1px solid var(--line);border-radius:16px;background:var(--paper-2)}
  .nav-spine .sp-toc,.nav-spine .sp-div{display:none}
  [data-layout="spine"] .col{padding-left:0}
  [data-layout="spine"] .col::before{display:none}
  [data-layout="spine"] article h2::before{display:none}
  [data-layout="spine"] article h2::after{display:block}
  .col{margin:0 auto}
}
@media(max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-art{order:2;margin-top:0}
  .manifesto-in{grid-template-columns:1fr;gap:22px}
  .cards{grid-template-columns:1fr}
  .card.feat{grid-template-columns:1fr;gap:22px}
  .card .feat-art{display:none}
  .nextprev{grid-template-columns:1fr}
  .metabar{flex-wrap:wrap}
  .metabar .cell{flex:1 1 50%;border-right:0}
}
@media(max-width:560px){
  .wrap,.hero,.catalog{padding-left:20px;padding-right:20px}
  .nav-in{padding:12px 20px}
  .nav-link{display:none}
  .navmenu-panel{position:fixed;left:16px;right:16px;top:58px;width:auto;max-width:none}
  body{font-size:18px}
  article p{font-size:18px}
  .hero h1{font-size:40px}
  .shell{padding:0 20px}
  .head h1{font-size:34px}
  .head .idstrip{flex-wrap:wrap;gap:10px}
}

/* ============================================================
   FIELD MANUAL refresh — homepage system layer
   blueprint grid · 5-cluster locator · hero plate · "Năm cụm" · gate strip
   (additive; reading page + diagrams untouched)
   ============================================================ */

/* blueprint grid layer — sections opt in via .bp */
.bp{position:relative}
.bp::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(120% 100% at 50% 0,#000 55%,transparent 100%);
          mask-image:radial-gradient(120% 100% at 50% 0,#000 55%,transparent 100%);
}
.bp > *{position:relative;z-index:1}

/* system locator — 5 cluster pips, persistent in nav */
.nav-c{display:flex;align-items:center;gap:18px}
.nlink{font-family:var(--sans);font-size:14px;font-weight:600;color:var(--ink-mute);cursor:pointer;display:inline-flex;align-items:center;gap:6px;background:none;border:0;padding:0;text-decoration:none}
.nlink:hover{color:var(--ink)}
.loc{display:flex;align-items:center;gap:3px}
.loc-pip{position:relative;display:flex;flex-direction:column;align-items:center;cursor:pointer;padding:2px;text-decoration:none}
.loc-pip .pn{font-family:var(--mono);font-size:11px;font-weight:600;color:var(--ink-mute);width:23px;height:23px;border-radius:7px;border:1px solid var(--line);background:var(--paper-2);display:grid;place-items:center;transition:.2s}
.loc-pip.soon .pn{border-style:dashed;opacity:.6}
.loc-pip.on .pn{background:var(--accent);border-color:var(--accent);color:#fff}
.loc-pip:hover .pn{border-color:var(--accent);color:var(--accent)}
.loc-pip.on:hover .pn{color:#fff}
.loc-pip .pt{position:absolute;top:calc(100% + 9px);left:50%;transform:translateX(-50%) translateY(-3px);white-space:nowrap;background:var(--ink);color:var(--paper);font-family:var(--sans);font-size:11.5px;font-weight:600;padding:5px 9px;border-radius:7px;opacity:0;pointer-events:none;transition:.18s;z-index:5}
.loc-pip:hover .pt{opacity:1;transform:translateX(-50%) translateY(0)}
.loc-sep{width:13px;height:1.5px;background:var(--line-2)}

/* hero blueprint plate — the lifecycle, animated */
.plate{background:var(--raise);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.plate-grid::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:30px 30px;opacity:.7}
.plate-tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;color:var(--ink-mute);text-transform:uppercase;display:flex;justify-content:space-between;align-items:center}
.plate-tag .live{color:var(--accent);display:inline-flex;align-items:center;gap:6px}
.plate-tag .live::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 var(--accent);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--accent) 60%,transparent)}70%{box-shadow:0 0 0 8px transparent}100%{box-shadow:0 0 0 0 transparent}}
.hero-plate{padding:26px 26px 24px;margin-top:0}
.hero-plate .pl-cap{font-family:var(--sans);font-size:12.5px;color:var(--ink-mute);margin-top:22px;line-height:1.55;border-top:1px solid var(--line);padding-top:15px}

/* signature gate strip (reusable, interactive) */
.gates{display:flex;align-items:stretch;gap:0;width:100%}
.gate{flex:1;display:flex;flex-direction:column;align-items:center;position:relative;padding:0 2px;cursor:pointer}
.gate .track{position:absolute;top:23px;left:0;right:0;height:2px;background:var(--line-2)}
.gate:first-child .track{left:50%}.gate:last-child .track{right:50%}
.gate .gb{position:relative;z-index:1;width:48px;height:48px;border-radius:50%;border:2px solid var(--accent);background:var(--raise);color:var(--accent);display:grid;place-items:center;font-family:var(--sans);font-weight:800;font-size:17px;transition:.25s}
.gate.fill .gb,.gate:hover .gb{background:var(--accent);color:#fff;box-shadow:0 6px 16px -4px var(--accent)}
.gate .gl{font-family:var(--sans);font-size:11.5px;color:var(--ink-soft);margin-top:12px;text-align:center;line-height:1.25;font-weight:600}
.gate .gs{font-family:var(--sans);font-size:10px;color:var(--ink-mute);margin-top:3px;text-align:center}

/* ── SYSTEM OVERVIEW (home) — 5 clusters at a glance ── */
.sys{border-top:1px solid var(--line);background:var(--paper-2);margin-top:30px}
.sys-in{max-width:var(--maxw);margin:0 auto;padding:64px 32px 70px}
.sys-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:40px}
.sys-head h2{font-family:var(--serif);font-weight:500;font-size:clamp(30px,3.6vw,46px);letter-spacing:-.025em;margin:10px 0 0;max-width:18ch;line-height:1.05;text-wrap:balance}
.sys-head .h-side{font-family:var(--sans);font-size:14.5px;line-height:1.6;color:var(--ink-soft);max-width:34ch;margin:0}
.sysrows{display:flex;flex-direction:column;border-top:1px solid var(--line-2)}
.srow{display:grid;grid-template-columns:120px 1fr auto;gap:28px;align-items:center;padding:24px 8px 24px 4px;border-bottom:1px solid var(--line);position:relative;text-align:left;cursor:pointer;transition:background .2s;text-decoration:none;color:inherit}
.srow:hover{background:color-mix(in srgb,var(--accent) 5%,transparent)}
.srow .s-no{font-family:var(--serif);font-style:italic;font-weight:500;font-size:64px;line-height:.8;color:var(--line-2);letter-spacing:-.04em;transition:color .25s}
.srow.live .s-no,.srow:hover .s-no{color:var(--accent)}
.srow .s-mid h3{font-family:var(--serif);font-weight:500;font-size:25px;letter-spacing:-.015em;margin:0;line-height:1.12;color:var(--ink)}
.srow .s-mid p{font-family:var(--sans);font-size:14px;line-height:1.55;color:var(--ink-soft);margin:7px 0 0;max-width:62ch}
.srow .s-right{display:flex;flex-direction:column;align-items:flex-end;gap:10px;min-width:150px}
.chip{font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:5px 11px;border-radius:999px;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.chip.live{background:var(--accent);color:#fff}
.chip.live::before{content:"";width:6px;height:6px;border-radius:50%;background:#fff}
.chip.soon{background:transparent;color:var(--ink-mute);border:1px dashed var(--line-2)}
.srow .s-go{font-family:var(--sans);font-size:13px;font-weight:600;color:var(--accent);display:inline-flex;align-items:center;gap:6px;opacity:0;transform:translateX(-6px);transition:.22s}
.srow:hover .s-go{opacity:1;transform:none}
.srow .s-go .arr{transition:transform .2s}.srow:hover .s-go .arr{transform:translateX(3px)}
.srow.soon{cursor:default}
.srow.soon .s-mid h3{color:var(--ink-soft)}
.srow.soon:hover{background:transparent}

/* ── bottom CTA band ── */
.sys-cta{background:var(--paper)}
.sys-cta .sys-in{text-align:center;padding-top:74px;padding-bottom:74px}
.sys-cta .kick{justify-content:center}
.sys-cta h2{font-family:var(--serif);font-weight:500;font-size:clamp(30px,4vw,52px);letter-spacing:-.025em;line-height:1.04;margin:14px auto 0;max-width:18ch;text-wrap:balance}
.sys-cta .hero-cta{justify-content:center;margin-top:32px}

/* reveal stagger helpers */
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}

@media(max-width:1080px){ .loc{display:none} }
@media(max-width:860px){
  .srow{grid-template-columns:74px 1fr;gap:18px}
  .srow .s-right{grid-column:2;flex-direction:row;align-items:center;min-width:0}
  .srow .s-no{font-size:46px}
}
@media(max-width:560px){
  .sys-in{padding-left:20px;padding-right:20px}
}

/* ============================================================
   MAP PAGE — "Bản đồ tri thức" (5 clusters as terrain)
   ============================================================ */
.sysnum{font-family:var(--serif);font-weight:500;font-style:italic;line-height:.8;letter-spacing:-.04em;color:var(--accent);font-variant-numeric:lining-nums}
.map-hero{max-width:var(--maxw);margin:0 auto;padding:70px 32px 30px;position:relative}
.map-hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(40px,5.4vw,74px);line-height:1.0;letter-spacing:-.028em;margin:16px 0 0;max-width:16ch;text-wrap:balance}
.map-hero h1 em{font-style:italic;color:var(--accent)}
.map-hero .lede{font-family:var(--serif);font-size:21px;line-height:1.55;color:var(--ink-soft);max-width:54ch;margin:24px 0 0}
.map-stat{display:flex;gap:36px;margin-top:34px;flex-wrap:wrap}
.map-stat .st b{font-family:var(--serif);font-style:italic;font-size:34px;color:var(--accent);display:block;line-height:1}
.map-stat .st span{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-mute);margin-top:6px;display:block}

.thesis{max-width:var(--maxw);margin:36px auto 0;padding:0 32px}
.thesis-in{background:var(--raise);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:34px 38px;display:grid;grid-template-columns:1fr auto;gap:36px;align-items:center;position:relative;overflow:hidden}
.thesis-in .t-lead{font-family:var(--serif);font-size:clamp(22px,2.6vw,30px);line-height:1.36;letter-spacing:-.01em;margin:0;max-width:30ch}
.thesis-in .t-lead b{color:var(--accent);font-weight:500;font-style:italic}
.thesis-traits{display:flex;flex-direction:column;gap:10px;min-width:230px}
.t-trait{display:flex;align-items:center;gap:12px;background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:11px 14px}
.t-trait .ti{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;flex:0 0 auto}
.t-trait .ti svg{width:18px;height:18px}
.t-trait .ti.ok{background:var(--wash);color:var(--accent)}
.t-trait .ti.warn{background:var(--alert-bg);color:var(--alert)}
.t-trait b{font-family:var(--sans);font-size:13.5px;font-weight:700;color:var(--ink);display:block}
.t-trait span{font-family:var(--sans);font-size:11.5px;color:var(--ink-mute);display:block;margin-top:1px}

.clusters{max-width:var(--maxw);margin:18px auto 0;padding:40px 32px 30px}
.cl-lead{display:flex;align-items:center;gap:14px;margin-bottom:10px}
.cl-lead .ln{flex:1;height:1px;background:var(--line-2)}
.cl{position:relative;display:grid;grid-template-columns:160px 1fr;gap:34px;padding:40px 0;border-top:1px solid var(--line)}
.cl:first-of-type{border-top:0}
.cl-num{position:relative}
.cl-num .sysnum{font-size:128px}
.cl.soon .cl-num .sysnum{color:var(--line-2)}
.cl-num .fig{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--ink-mute);text-transform:uppercase;margin-top:8px;display:block}
.cl-body{min-width:0}
.cl-top{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;flex-wrap:wrap}
.cl-top h2{font-family:var(--serif);font-weight:500;font-size:clamp(26px,3vw,38px);letter-spacing:-.02em;margin:0;line-height:1.06;color:var(--ink);max-width:20ch;text-wrap:balance}
.cl.soon .cl-top h2{color:var(--ink-soft)}
.cl-kick{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-mute);margin-bottom:12px;display:block}
.cl-idea{font-family:var(--serif);font-style:italic;font-size:19px;line-height:1.5;color:var(--ink-soft);margin:16px 0 0;max-width:58ch}
.cl-idea b{font-style:normal;color:var(--accent);font-weight:500}
.cl-arts{margin-top:26px;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.art{display:flex;gap:14px;align-items:flex-start;background:var(--raise);border:1px solid var(--line);border-radius:14px;padding:16px 18px;cursor:pointer;transition:transform .2s,border-color .2s,box-shadow .2s;position:relative;overflow:hidden;text-decoration:none}
.art::after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);transform:scaleY(0);transform-origin:top;transition:transform .26s}
.art:hover{transform:translateY(-2px);border-color:var(--line-2);box-shadow:var(--shadow-sm)}
.art:hover::after{transform:scaleY(1)}
.art.pillar{grid-column:1/-1;background:var(--wash);border-color:var(--accent-ink)}
.art .a-no{flex:0 0 auto;width:30px;height:30px;border-radius:9px;background:var(--paper-2);border:1px solid var(--line);display:grid;place-items:center;font-family:var(--mono);font-size:13px;color:var(--ink-mute);font-weight:600}
.art.pillar .a-no{background:var(--accent);border-color:var(--accent);color:#fff}
.art .a-tx b{font-family:var(--serif);font-weight:500;font-size:16.5px;line-height:1.22;letter-spacing:-.01em;color:var(--ink);display:block}
.art .a-tx span{font-family:var(--mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-mute);margin-top:5px;display:block}
.cl-soon-box{margin-top:22px;border:1px dashed var(--line-2);border-radius:14px;padding:18px 20px;display:flex;align-items:center;gap:16px;background:color-mix(in srgb,var(--paper-2) 60%,transparent)}
.cl-soon-box .si{flex:0 0 auto;width:42px;height:42px;border-radius:11px;background:var(--paper-2);border:1px solid var(--line);display:grid;place-items:center;color:var(--ink-mute)}
.cl-soon-box .si svg{width:22px;height:22px}
.cl-soon-box p{margin:0;font-family:var(--sans);font-size:13.5px;line-height:1.55;color:var(--ink-mute)}
.cl-soon-box p b{color:var(--ink-soft);font-weight:600}

@media(max-width:900px){
  .thesis-in{grid-template-columns:1fr;gap:24px}
  .cl-arts{grid-template-columns:1fr}
  .cl{grid-template-columns:84px 1fr;gap:18px}
  .cl-num .sysnum{font-size:72px}
}
@media(max-width:560px){
  .map-hero,.clusters,.thesis{padding-left:20px;padding-right:20px}
  .nav-c{display:none}
}