/* ============================================================ TOKENS === */
:root{
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sb-w: 268px; --bar-h: 60px; --read: 880px;
  --r-card:16px; --r-btn:11px; --r-pill:999px;
  --sp:16px;
  --t: 160ms cubic-bezier(.4,0,.2,1);
  /* light */
  --bg:#f6f8fb; --surface:#fff; --surface-2:#eef1f6; --surface-3:#e7ebf2;
  --text:#1b2330; --muted:#5a6677; --faint:#8a94a6;
  --border:#e3e8ef; --border-strong:#d4dbe6;
  --accent:#1a73e8; --accent-ink:#0b5ed7; --accent-soft:#e8f0fe;
  --violet:#7c4dff; --violet-soft:#efe9ff;
  --green:#1e8e3e; --green-soft:#e6f4ea; --red:#d93025; --red-soft:#fce8e6;
  --amber:#e37400; --amber-soft:#fef3e0; --slate:#5f6b7a; --slate-soft:#eef1f5;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 4px 16px rgba(16,24,40,.06);
  --shadow-lg:0 8px 32px rgba(16,24,40,.12);
  --code-bg:#0d1320;
}
[data-theme="dark"]{
  --bg:#0c1016; --surface:#141a23; --surface-2:#1b232f; --surface-3:#232d3b;
  --text:#e7ebf3; --muted:#9aa6b8; --faint:#6b7689;
  --border:#242e3c; --border-strong:#33404f;
  --accent:#6ea8fe; --accent-ink:#8bbbff; --accent-soft:#16263f;
  --violet:#b794ff; --violet-soft:#241a3d;
  --green:#5bd07f; --green-soft:#0f2a1a; --red:#ff7a70; --red-soft:#341614;
  --amber:#ffb454; --amber-soft:#33240e; --slate:#9aa6b8; --slate-soft:#1d2530;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 6px 22px rgba(0,0,0,.35);
  --shadow-lg:0 12px 40px rgba(0,0,0,.5);
  --code-bg:#0a0f1a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{transition:none!important;animation:none!important}}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);
  font-size:15.5px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* ============================================================ LAYOUT === */
.layout{display:flex;min-height:100vh}
.sidebar{width:var(--sb-w);flex:0 0 var(--sb-w);position:sticky;top:0;height:100vh;
  background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:40}
.content{flex:1;min-width:0;padding:34px clamp(18px,4vw,52px) 96px;max-width:100%;}
.content:focus{outline:none}

/* brand */
.brand{display:flex;align-items:center;gap:11px;padding:18px 18px 14px;border-bottom:1px solid var(--border)}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;grid-template-columns:1fr 1fr;gap:3px;width:26px;height:26px;flex:0 0 26px}
.brand-mark .dot{border-radius:50%}
.dot.b{background:#4285f4}.dot.r{background:#ea4335}.dot.y{background:#fbbc05}.dot.g{background:#34a853}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:15.5px;color:var(--text);letter-spacing:-.01em}
.brand-text small{font-size:11.5px;color:var(--muted);letter-spacing:.02em}

/* nav */
.nav{flex:1;overflow-y:auto;padding:12px 12px 8px}
.nav-section{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--faint);padding:14px 12px 6px}
.nav a{display:flex;align-items:center;gap:11px;padding:9px 12px;border-radius:10px;color:var(--muted);
  font-weight:550;font-size:14.5px;transition:background var(--t),color var(--t);position:relative}
.nav a:hover{background:var(--surface-2);color:var(--text);text-decoration:none}
.nav a.active{background:var(--accent-soft);color:var(--accent-ink)}
.nav a.active::before{content:"";position:absolute;left:-12px;top:8px;bottom:8px;width:3px;border-radius:0 3px 3px 0;background:var(--accent)}
.ni{width:19px;height:19px;flex:0 0 19px}
.nav a .ni{opacity:.9}
.plan-phase h3 .ni{color:var(--green)}
.nav a .badge-count{margin-left:auto;font-size:11px;background:var(--surface-3);color:var(--muted);
  padding:1px 8px;border-radius:var(--r-pill);font-weight:700}
.nav a.active .badge-count{background:#fff;color:var(--accent-ink)}
[data-theme="dark"] .nav a.active .badge-count{background:var(--surface)}

/* nav progress */
.nav-progress{padding:14px 16px;border-top:1px solid var(--border);font-size:12.5px;color:var(--muted)}
.np-row{display:flex;justify-content:space-between;margin-bottom:7px;font-weight:600}
.np-bar{height:7px;background:var(--surface-3);border-radius:var(--r-pill);overflow:hidden}
.np-fill{height:100%;width:0;border-radius:var(--r-pill);background:linear-gradient(90deg,var(--accent),var(--violet));transition:width .5s ease}
.np-reset{margin-top:9px;font-size:11.5px;color:var(--faint);background:none;border:none;cursor:pointer;padding:0;text-decoration:underline}
.np-reset:hover{color:var(--red)}

/* ============================================================ APPBAR === */
.appbar{display:none;position:sticky;top:0;height:var(--bar-h);z-index:50;align-items:center;gap:10px;
  padding:0 14px;background:var(--surface);border-bottom:1px solid var(--border)}
.appbar-search{flex:1;display:flex;align-items:center;gap:8px;background:var(--surface-2);
  border:1px solid var(--border);border-radius:var(--r-pill);padding:8px 14px}
.appbar-search:focus-within{border-color:var(--accent);background:var(--surface)}
.appbar-search input{flex:1;border:none;background:none;color:var(--text);font-size:14.5px;outline:none}
.search-ico{color:var(--faint);flex:0 0 18px}
.kbd,.kbd kbd{font-family:var(--mono);font-size:11px;color:var(--faint);background:var(--surface-3);
  border:1px solid var(--border);border-radius:6px;padding:1px 6px}
.icon-btn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:11px;border:none;
  background:none;color:var(--muted);cursor:pointer;transition:background var(--t),color var(--t)}
.icon-btn:hover{background:var(--surface-2);color:var(--text)}
.ico-moon{display:none}[data-theme="dark"] .ico-sun{display:none}[data-theme="dark"] .ico-moon{display:block}

/* desktop floating search+theme (top-right of content) */
.toolbar{position:sticky;top:0;z-index:30;display:flex;justify-content:flex-end;gap:10px;align-items:center;
  margin:-34px clamp(-18px,-4vw,-52px) 18px;padding:14px clamp(18px,4vw,52px);
  background:linear-gradient(var(--bg) 70%, transparent);pointer-events:none}
.toolbar>*{pointer-events:auto}
.toolbar .appbar-search{max-width:420px;flex:1}

/* ============================================================ HELPERS == */
.scrim{position:fixed;inset:0;background:rgba(10,14,22,.5);z-index:39;backdrop-filter:blur(2px)}
.eyebrow{font-size:12px;font-weight:750;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0 0 8px}
.page-h1{font-size:clamp(26px,3.4vw,36px);line-height:1.12;letter-spacing:-.02em;margin:0 0 10px;font-weight:800}
.lede{font-size:17px;color:var(--muted);max-width:62ch;margin:0 0 26px}
.section-gap{height:34px}
.muted{color:var(--muted)}
.pill{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:650;padding:3px 11px;border-radius:var(--r-pill);
  background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}
.tag{font-size:11.5px;font-weight:600;padding:2px 9px;border-radius:7px;background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}
.badge{font-size:11px;font-weight:750;padding:2px 9px;border-radius:7px;letter-spacing:.01em}
.b-pass{background:var(--green-soft);color:var(--green)} .b-fail{background:var(--red-soft);color:var(--red)}
.b-pending{background:var(--amber-soft);color:var(--amber)} .b-ref{background:var(--slate-soft);color:var(--slate)}
.b-level{background:var(--violet-soft);color:var(--violet)} .b-track{background:var(--accent-soft);color:var(--accent-ink)}
.star{color:#fbbc05}

.btn{display:inline-flex;align-items:center;gap:8px;font-family:inherit;font-size:14.5px;font-weight:650;
  padding:11px 18px;border-radius:var(--r-btn);border:1px solid var(--border-strong);background:var(--surface);
  color:var(--text);cursor:pointer;transition:all var(--t)}
.btn:hover{background:var(--surface-2);text-decoration:none}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-ink)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0}

/* cards */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow)}
.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* link cards (home) */
.linkcard{display:flex;flex-direction:column;gap:8px;padding:20px;text-decoration:none;color:inherit;transition:transform var(--t),box-shadow var(--t),border-color var(--t)}
.linkcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--border-strong);text-decoration:none}
.linkcard .lc-ico{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-ink);margin-bottom:4px}
.linkcard h3{margin:0;font-size:17px;font-weight:700;letter-spacing:-.01em}
.linkcard p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.55}
.linkcard .lc-go{margin-top:auto;font-size:13px;font-weight:650;color:var(--accent);display:flex;align-items:center;gap:5px}

/* hero (home) */
.hero{position:relative;overflow:hidden;border-radius:22px;padding:34px;margin-bottom:28px;color:#fff;
  background:linear-gradient(125deg,#1a73e8 0%, #6c47ff 58%, #a142f4 100%)}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.22),transparent 70%)}
.hero h1{margin:0 0 10px;font-size:clamp(24px,3.4vw,34px);font-weight:800;letter-spacing:-.02em;position:relative}
.hero p{margin:0 0 18px;font-size:16px;opacity:.95;max-width:60ch;position:relative}
.hero .btn-row{position:relative;margin:0}
.hero .btn{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.28);color:#fff;backdrop-filter:blur(4px)}
.hero .btn:hover{background:rgba(255,255,255,.26)}
.hero .btn.primary{background:#fff;color:var(--accent-ink);border-color:#fff}
.hero .hero-stats{display:flex;gap:26px;margin-top:22px;position:relative;flex-wrap:wrap}
.hero-stats .hs{display:flex;flex-direction:column}
.hero-stats .hs b{font-size:22px;font-weight:800}
.hero-stats .hs span{font-size:12.5px;opacity:.9}

/* the loop strip */
.loop{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:6px 0 8px}
.loop .lp{padding:20px;border-left:4px solid var(--accent)}
.loop .lp.rrk{border-left-color:var(--violet)}
.loop .lp h3{margin:0 0 6px;font-size:18px;display:flex;align-items:center;gap:9px}
.loop .lp .mins{margin-left:auto;font-size:12px;color:var(--muted);font-weight:600}
.loop .lp p{margin:0;font-size:14px;color:var(--muted)}

/* callout */
.callout{border:1px solid var(--border);border-left:4px solid var(--amber);background:var(--amber-soft);
  border-radius:12px;padding:16px 18px;margin:20px 0;font-size:14.5px;color:var(--text)}
.callout.info{border-left-color:var(--accent);background:var(--accent-soft)}
.callout.tip{border-left-color:var(--green);background:var(--green-soft)}
.callout b{font-weight:750}

/* ===================================================== PREDICTIONS ===== */
.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-pill);padding:4px}
.seg button{border:none;background:none;font:inherit;font-size:13.5px;font-weight:650;color:var(--muted);
  padding:7px 18px;border-radius:var(--r-pill);cursor:pointer;transition:all var(--t)}
.seg button.on{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}
.pred{padding:18px 20px;margin-bottom:14px;display:grid;grid-template-columns:46px 1fr;gap:16px;align-items:start}
.pred .rank{font-size:15px;font-weight:800;color:var(--muted);width:46px;height:46px;border-radius:12px;
  display:grid;place-items:center;background:var(--surface-2);border:1px solid var(--border)}
.pred.top .rank{background:linear-gradient(135deg,var(--accent),var(--violet));color:#fff;border:none}
.pred h3{margin:0 0 8px;font-size:17px;font-weight:700;letter-spacing:-.01em}
.conf{display:flex;align-items:center;gap:12px;margin:6px 0 12px}
.conf-bar{flex:1;max-width:260px;height:9px;background:var(--surface-3);border-radius:var(--r-pill);overflow:hidden}
.conf-fill{height:100%;border-radius:var(--r-pill);background:linear-gradient(90deg,#34a853,#fbbc05,#ea4335);background-size:300% 100%}
.conf .pct{font-weight:800;font-size:15px;min-width:42px}
.conf .lbl{font-size:12px;font-weight:650;color:var(--muted);padding:2px 10px;border-radius:var(--r-pill);background:var(--surface-2);border:1px solid var(--border)}
.pred .why{font-size:14px;color:var(--muted);margin:0 0 10px}
.pred .why b,.pred .drill b{color:var(--text)}
.pred .drill{font-size:14px;background:var(--surface-2);border:1px solid var(--border);border-radius:11px;padding:11px 14px;margin:0 0 12px}
.pred .drill::before{content:"▸ Drill this";display:block;font-size:11px;font-weight:750;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);margin-bottom:4px}
.pred .rels{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.pred .rels .rl-label{font-size:11.5px;color:var(--faint);margin-right:2px}
.chip{font-size:11.5px;font-weight:650;padding:2px 9px;border-radius:7px;background:var(--accent-soft);color:var(--accent-ink);border:1px solid transparent;cursor:pointer}
.chip:hover{text-decoration:none;border-color:var(--accent)}

/* study cards (coding / rrk patterns) with checkbox */
.study{padding:18px 20px;margin-bottom:14px}
.study .sh{display:flex;align-items:flex-start;gap:12px}
.study h3{margin:0;font-size:16.5px;font-weight:700;flex:1}
.check{display:inline-flex;align-items:center;gap:8px;cursor:pointer;user-select:none;font-size:12.5px;color:var(--muted);font-weight:600;white-space:nowrap}
.check input{position:absolute;opacity:0;width:0;height:0}
.check .box{width:22px;height:22px;border-radius:7px;border:2px solid var(--border-strong);display:grid;place-items:center;transition:all var(--t);flex:0 0 22px}
.check input:checked+.box{background:var(--green);border-color:var(--green)}
.check .box svg{opacity:0;transition:opacity var(--t)}
.check input:checked+.box svg{opacity:1}
.check input:focus-visible+.box{outline:2px solid var(--accent);outline-offset:2px}
.study.done{opacity:.62}
.study.done h3{text-decoration:line-through;text-decoration-color:var(--faint)}

/* ===================================================== THREADS ========= */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 20px;align-items:center}
.filters select,.filters input{font:inherit;font-size:13.5px;padding:8px 12px;border-radius:10px;
  border:1px solid var(--border);background:var(--surface);color:var(--text)}
.filters .count{margin-left:auto;font-size:13px;color:var(--muted)}
.tcard{display:block;padding:16px 18px;text-decoration:none;color:inherit;transition:transform var(--t),box-shadow var(--t),border-color var(--t)}
.tcard:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--border-strong);text-decoration:none}
.tcard .tc-top{display:flex;align-items:center;gap:8px;margin-bottom:6px;flex-wrap:wrap}
.tcard .tc-num{font-size:12px;font-weight:750;color:var(--faint)}
.tcard h3{margin:4px 0 6px;font-size:16px;font-weight:700;line-height:1.3}
.tcard p{margin:0 0 10px;font-size:13.5px;color:var(--muted);line-height:1.5}
.tcard .tc-tags{display:flex;flex-wrap:wrap;gap:5px}
.thread-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(320px,1fr))}

/* ===================================================== PROSE =========== */
.prose{max-width:var(--read)}
.prose h1{font-size:27px;font-weight:800;letter-spacing:-.02em;margin:34px 0 14px;line-height:1.2}
.prose h2{font-size:22px;font-weight:750;letter-spacing:-.01em;margin:32px 0 12px;padding-bottom:7px;border-bottom:1px solid var(--border)}
.prose h3{font-size:18px;font-weight:700;margin:24px 0 9px}
.prose h4{font-size:15.5px;font-weight:700;margin:18px 0 7px;color:var(--muted)}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{margin:0 0 14px;padding-left:24px}
.prose li{margin:5px 0}
.prose li::marker{color:var(--accent)}
.prose strong{font-weight:700;color:var(--text)}
.prose a{font-weight:550}
.prose blockquote{margin:16px 0;padding:13px 18px;border-left:4px solid var(--accent);
  background:var(--accent-soft);border-radius:0 12px 12px 0;color:var(--text)}
.prose blockquote p:last-child{margin-bottom:0}
.prose hr{border:none;border-top:1px solid var(--border);margin:28px 0}
.prose code{font-family:var(--mono);font-size:.88em;background:var(--surface-3);padding:.12em .42em;border-radius:6px;color:var(--accent-ink)}
[data-theme="dark"] .prose code{color:var(--accent)}
.prose pre,.prose .codehilite{background:var(--code-bg)!important;border-radius:13px;padding:0;margin:0 0 16px;
  overflow:hidden;border:1px solid rgba(255,255,255,.06);position:relative}
.prose pre code,.prose .codehilite code,.prose .codehilite pre{background:none!important;color:#e6e9ef;padding:0}
.prose .codehilite pre{margin:0;padding:16px 18px;overflow-x:auto}
.prose pre>code{display:block;padding:16px 18px;overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.6}
.prose .codehilite{font-family:var(--mono);font-size:13px;line-height:1.6}
.copy-btn{position:absolute;top:8px;right:8px;font-size:11px;font-weight:650;color:#aab4c5;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.12);border-radius:7px;padding:4px 9px;cursor:pointer;opacity:0;transition:opacity var(--t)}
.prose pre:hover .copy-btn,.prose .codehilite:hover .copy-btn{opacity:1}
.copy-btn:hover{background:rgba(255,255,255,.16);color:#fff}
.prose table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:13.5px;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--border);padding:9px 12px;text-align:left;vertical-align:top}
.prose th{background:var(--surface-2);font-weight:700}
.prose tr:nth-child(even) td{background:var(--surface)}

/* sub-nav (guide / patterns) */
.subnav{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px}
.subnav a{font-size:13px;font-weight:600;padding:7px 14px;border-radius:var(--r-pill);background:var(--surface-2);
  border:1px solid var(--border);color:var(--muted)}
.subnav a:hover{color:var(--text);text-decoration:none;border-color:var(--border-strong)}
.subnav a.active{background:var(--accent);border-color:var(--accent);color:#fff}

.backlink{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;color:var(--muted);margin-bottom:14px}
.backlink:hover{color:var(--accent);text-decoration:none}

/* thread detail meta */
.tmeta{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;align-items:center}

/* plan */
.plan-phase{margin-bottom:14px;padding:18px 20px}
.plan-phase h3{margin:0 0 12px;font-size:16px;font-weight:700;display:flex;align-items:center;gap:10px}
.plan-phase .ph-pct{margin-left:auto;font-size:12.5px;color:var(--muted);font-weight:650}
.task{display:flex;align-items:flex-start;gap:12px;padding:9px 0;border-top:1px solid var(--border)}
.task:first-of-type{border-top:none}
.task label{flex:1;cursor:pointer;font-size:14.5px}
.task.done label{color:var(--faint);text-decoration:line-through;text-decoration-color:var(--faint)}

/* search results */
.sr-group{margin-bottom:22px}
.sr-group h2{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);margin:0 0 10px}
.sr-item{display:block;padding:12px 16px;margin-bottom:8px;text-decoration:none;color:inherit}
.sr-item:hover{text-decoration:none;border-color:var(--border-strong);box-shadow:var(--shadow)}
.sr-item .sr-kind{font-size:11px;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.04em}
.sr-item h3{margin:3px 0 3px;font-size:15px;font-weight:650}
.sr-item p{margin:0;font-size:13px;color:var(--muted)}
mark{background:rgba(251,188,5,.34);color:inherit;border-radius:3px;padding:0 2px}
[data-theme="dark"] mark{background:rgba(251,188,5,.28)}

.empty{text-align:center;padding:60px 20px;color:var(--muted)}
.empty svg{opacity:.4;margin-bottom:12px}

/* toast */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--text);color:var(--bg);font-size:13.5px;font-weight:600;padding:10px 18px;border-radius:var(--r-pill);
  box-shadow:var(--shadow-lg);z-index:80;opacity:0;transition:all var(--t)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============================================================ RESPONSIVE */
@media (max-width:980px){
  .toolbar{display:none}
  .appbar{display:flex}
  .sidebar{position:fixed;left:0;top:0;transform:translateX(-100%);transition:transform var(--t);box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:translateX(0)}
  .content{padding:22px 18px 90px}
  .loop{grid-template-columns:1fr}
}
@media (min-width:981px){ .appbar{display:none} }
@media (max-width:560px){
  .hero{padding:24px}
  .pred{grid-template-columns:1fr;gap:10px}
  .pred .rank{width:38px;height:38px}
}