/* ==========================================================================
   PROJECT APEX — Institutional Trading Knowledge Portal
   Design system: "Trading Desk / Ledger" — deep charcoal-navy base, an
   institutional gold ledger accent (candlestick-bullish gold, not neon),
   a cool structural teal for liquidity/structure, and a brick-red for
   warnings/bearish framing. Display type is an editorial serif (the
   financial-print register); body is a humanist sans; data/prices are
   monospace, exactly as they'd appear on a real execution terminal.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  color-scheme: dark;
  --bg:            #0D1015;
  --bg-elevated:   #12161D;
  --bg-card:       #171C24;
  --bg-card-hover: #1D232D;
  --border:        #262D38;
  --border-strong: #34404F;
  --text:          #E9ECF1;
  --text-dim:      #9AA4B2;
  --text-faint:    #626C7A;

  --gold:    #C9A227;
  --gold-dim:#8A7220;
  --teal:    #3FA9A0;
  --teal-dim:#2A736C;
  --brick:   #C1503D;
  --violet:  #6F6BAE;

  --tier-foundation:   var(--teal);
  --tier-intermediate: var(--gold);
  --tier-advanced:     var(--brick);
  --tier-professional: var(--violet);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.5);
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --header-h: 64px;
  --content-max: 1180px;
  --transition: 180ms cubic-bezier(.4,0,.2,1);
}

html[data-theme="light"]{
  color-scheme: light;
  --bg:            #F6F4EE;
  --bg-elevated:   #FFFFFF;
  --bg-card:       #FFFFFF;
  --bg-card-hover: #F0EEE6;
  --border:        #E1DDD1;
  --border-strong: #CCC6B4;
  --text:          #1B1E24;
  --text-dim:      #565F6B;
  --text-faint:    #8B93A0;
  --gold:    #96731A;
  --gold-dim:#B08B2A;
  --teal:    #1E7A72;
  --teal-dim:#3FA9A0;
  --brick:   #A43F2E;
  --violet:  #5B5793;
  --shadow-card: 0 1px 2px rgba(20,20,10,.06), 0 8px 20px -14px rgba(20,20,10,.18);
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{ animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family: var(--font-body); font-size:16px; line-height:1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}
h1,h2,h3,h4{ font-family: var(--font-display); font-weight:600; line-height:1.15; margin:0 0 .5em; letter-spacing:-.01em; }
h1{ font-size: clamp(2rem, 4vw, 3.2rem); font-weight:600; }
h2{ font-size: clamp(1.4rem, 2.4vw, 1.9rem); }
h3{ font-size: 1.2rem; }
p{ margin:0 0 1em; color:var(--text-dim); }
a{ color:inherit; text-decoration:none; }
code, .mono, .num{ font-family: var(--font-mono); }
ul,ol{ padding-left:1.2em; }
li{ margin-bottom:.4em; color:var(--text-dim); }
img,svg{ display:block; max-width:100%; }
button{ font-family:inherit; cursor:pointer; }

/* Skip link / a11y */
.skip-link{
  position:absolute; left:-9999px; top:0; background:var(--gold); color:#141414;
  padding:.6em 1em; z-index:200; border-radius:0 0 8px 0; font-weight:600;
}
.skip-link:focus{ left:0; }
:focus-visible{ outline: 2px solid var(--gold); outline-offset: 2px; }

/* Scroll progress bar */
#scroll-progress{
  position:fixed; top:0; left:0; height:3px; background: linear-gradient(90deg, var(--teal), var(--gold));
  z-index: 300; width:0%; transition: width 80ms linear;
}

/* Header */
header.site-header{
  position:sticky; top:0; z-index:100; height:var(--header-h);
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
  display:flex; align-items:center;
}
.header-inner{
  max-width:var(--content-max); margin:0 auto; width:100%; padding:0 20px;
  display:flex; align-items:center; gap:20px; height:100%;
}
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:1.15rem; white-space:nowrap; }
.brand-mark{ width:26px; height:26px; flex:none; }
.brand small{ display:block; font-family:var(--font-body); font-weight:500; font-size:.62rem; letter-spacing:.14em; text-transform:uppercase; color:var(--gold); }

nav.main-nav{ display:flex; align-items:center; gap:2px; flex:1; overflow-x:auto; scrollbar-width:none; }
nav.main-nav::-webkit-scrollbar{ display:none; }
nav.main-nav a{
  padding:8px 12px; border-radius:var(--radius-sm); font-size:.87rem; font-weight:500;
  color:var(--text-dim); white-space:nowrap; transition: color var(--transition), background var(--transition);
}
nav.main-nav a:hover, nav.main-nav a.active{ color:var(--text); background:var(--bg-card); }

.header-actions{ display:flex; align-items:center; gap:8px; }
.icon-btn{
  width:38px; height:38px; display:grid; place-items:center; border-radius:var(--radius-sm);
  background:transparent; border:1px solid var(--border); color:var(--text-dim);
  transition: all var(--transition);
}
.icon-btn:hover{ color:var(--text); border-color:var(--border-strong); background:var(--bg-card); }
.icon-btn svg{ width:17px; height:17px; }

.search-trigger{
  display:flex; align-items:center; gap:8px; padding:0 12px; height:38px; border-radius:var(--radius-sm);
  border:1px solid var(--border); background:var(--bg); color:var(--text-faint); font-size:.82rem;
  min-width:180px;
}
.search-trigger kbd{
  margin-left:auto; font-family:var(--font-mono); font-size:.7rem; background:var(--bg-card);
  border:1px solid var(--border); border-radius:4px; padding:1px 6px; color:var(--text-faint);
}

/* Layout */
main{ display:block; min-height: calc(100vh - var(--header-h) - 220px); }
.wrap{ max-width:var(--content-max); margin:0 auto; padding:0 20px; }
.page-pad{ padding: 40px 0 80px; }

.breadcrumbs{ font-size:.82rem; color:var(--text-faint); margin-bottom:22px; display:flex; gap:6px; flex-wrap:wrap; }
.breadcrumbs a{ color:var(--text-dim); }
.breadcrumbs a:hover{ color:var(--gold); }

/* Hero */
.hero{
  position:relative; overflow:hidden; border-bottom:1px solid var(--border);
  background:
    radial-gradient(1200px 500px at 85% -10%, color-mix(in srgb, var(--teal) 14%, transparent), transparent 60%),
    radial-gradient(900px 400px at 5% 110%, color-mix(in srgb, var(--gold) 10%, transparent), transparent 60%);
}
.hero-inner{ max-width:var(--content-max); margin:0 auto; padding:72px 20px 56px; position:relative; z-index:2; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--gold); font-weight:600; margin-bottom:18px;
}
.eyebrow::before{ content:''; width:16px; height:1px; background:var(--gold); }
.hero h1{ max-width:14ch; margin-bottom:.3em; }
.hero .lede{ max-width:56ch; font-size:1.08rem; color:var(--text-dim); }
.hero-actions{ display:flex; gap:12px; margin-top:28px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; gap:8px; padding:11px 20px; border-radius:var(--radius-sm);
  font-weight:600; font-size:.9rem; border:1px solid transparent; transition: all var(--transition);
}
.btn-primary{ background:var(--gold); color:#161200; }
.btn-primary:hover{ background: color-mix(in srgb, var(--gold) 88%, white); }
.btn-ghost{ border-color:var(--border-strong); color:var(--text); background:transparent; }
.btn-ghost:hover{ background:var(--bg-card); }

/* Candle motif — signature element, used as hero background art + section dividers */
.candle-strip{ position:absolute; inset:auto 0 0 0; height:180px; z-index:1; opacity:.5; pointer-events:none; }
html[data-theme="light"] .candle-strip{ opacity:.28; }
.candle-divider{ display:flex; align-items:flex-end; gap:3px; height:22px; margin: 34px 0; opacity:.55; }
.candle-divider i{ width:3px; background:var(--border-strong); display:block; border-radius:1px; }

/* Section headers */
.section-head{ display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin-bottom:22px; flex-wrap:wrap; }
.section-head h2{ margin:0; }
.section-head .sub{ color:var(--text-faint); font-size:.9rem; margin:0; }
.see-all{ font-size:.85rem; font-weight:600; color:var(--teal); white-space:nowrap; }
.see-all:hover{ color:var(--gold); }

/* Grids & Cards */
.grid{ display:grid; gap:18px; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
@media (max-width:980px){ .grid-3{grid-template-columns:repeat(2,1fr);} .grid-4{grid-template-columns:repeat(2,1fr);} }
@media (max-width:620px){ .grid-3,.grid-4{grid-template-columns:1fr;} }

.card{
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:20px; transition: all var(--transition); box-shadow:var(--shadow-card); display:flex; flex-direction:column;
}
.card:hover{ background:var(--bg-card-hover); border-color:var(--border-strong); transform: translateY(-2px); }
.card h3{ margin-bottom:6px; }
.card p{ font-size:.88rem; margin-bottom:10px; }
.card-foot{ margin-top:auto; display:flex; align-items:center; gap:8px; padding-top:12px; }

.tier-pill{
  font-size:.66rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  padding:3px 9px; border-radius:99px; border:1px solid currentColor;
}
.tier-pill.foundation{ color:var(--tier-foundation); }
.tier-pill.intermediate{ color:var(--tier-intermediate); }
.tier-pill.advanced{ color:var(--tier-advanced); }
.tier-pill.professional{ color:var(--tier-professional); }

.topic-chip{
  display:inline-flex; align-items:center; font-size:.72rem; font-weight:500; color:var(--text-dim);
  background:var(--bg); border:1px solid var(--border); border-radius:99px; padding:3px 10px; margin:0 6px 6px 0;
  transition: all var(--transition);
}
.topic-chip:hover{ border-color:var(--teal); color:var(--teal); }

/* Topic icon tile */
.topic-icon{
  width:40px; height:40px; border-radius:10px; display:grid; place-items:center; margin-bottom:14px;
  background: color-mix(in srgb, var(--teal) 14%, transparent); color:var(--teal); flex:none;
}
.topic-icon svg{ width:20px; height:20px; }

/* Book detail */
.book-hero{ display:grid; grid-template-columns: 220px 1fr; gap:32px; align-items:start; }
@media (max-width:760px){ .book-hero{ grid-template-columns:1fr; } }
.book-cover{
  aspect-ratio: 2/3; border-radius:var(--radius-md); border:1px solid var(--border-strong);
  display:flex; flex-direction:column; justify-content:space-between; padding:18px;
  background: linear-gradient(155deg, var(--bg-card), var(--bg));
  position:relative; overflow:hidden;
}
.book-cover .num{ font-size:.7rem; color:var(--text-faint); }
.book-cover .ttl{ font-family:var(--font-display); font-size:1.05rem; font-weight:600; line-height:1.2; }
.book-cover .auth{ font-size:.78rem; color:var(--text-faint); }

.meta-row{ display:flex; flex-wrap:wrap; gap:8px 20px; font-size:.83rem; color:var(--text-faint); margin:14px 0 18px; }
.meta-row b{ color:var(--text-dim); font-weight:600; }

.tabs{ display:flex; gap:4px; border-bottom:1px solid var(--border); margin:34px 0 22px; overflow-x:auto; }
.tab-btn{
  padding:10px 16px; font-size:.86rem; font-weight:600; color:var(--text-faint); border-bottom:2px solid transparent;
  white-space:nowrap; background:transparent; border-top:none; border-left:none; border-right:none;
}
.tab-btn.active{ color:var(--gold); border-bottom-color:var(--gold); }
.tab-panel{ display:none; }
.tab-panel.active{ display:block; animation: fadeIn 220ms ease; }
@keyframes fadeIn{ from{opacity:0; transform:translateY(4px);} to{opacity:1; transform:none;} }

.callout{
  border:1px solid var(--border); border-left:3px solid var(--gold); background:var(--bg-card);
  border-radius:0 var(--radius-md) var(--radius-md) 0; padding:16px 18px; margin:18px 0; font-size:.92rem;
}
.callout.warn{ border-left-color:var(--brick); }
.callout.info{ border-left-color:var(--teal); }
.callout p:last-child{ margin-bottom:0; }
.callout-title{ font-weight:700; font-size:.78rem; text-transform:uppercase; letter-spacing:.06em; margin-bottom:6px; color:var(--text); }

/* Video embed card */
.video-card{ border:1px solid var(--border); border-radius:var(--radius-md); overflow:hidden; margin-bottom:20px; background:var(--bg-card); }
.video-frame-wrap{ position:relative; width:100%; aspect-ratio:16/9; background:#000; }
.video-frame-wrap iframe{ position:absolute; inset:0; width:100%; height:100%; border:0; }
.video-meta{ padding:14px 18px; }
.video-meta h4{ font-family:var(--font-body); font-weight:700; font-size:.95rem; margin:0 0 4px; }
.video-meta .chan{ font-size:.78rem; color:var(--text-faint); margin-bottom:8px; }
.video-meta .why{ font-size:.85rem; }
.video-lazy{
  display:flex; align-items:center; justify-content:center; height:100%; cursor:pointer;
  background: linear-gradient(155deg, var(--bg-card), var(--bg));
}
.play-btn{ width:56px; height:56px; border-radius:50%; background:var(--gold); display:grid; place-items:center; color:#161200; }
.play-btn svg{ width:20px; height:20px; margin-left:3px; }

/* Checklists */
.check-list{ list-style:none; padding:0; }
.check-list li{
  display:flex; align-items:flex-start; gap:10px; padding:8px 0; border-bottom:1px dashed var(--border);
  font-size:.92rem;
}
.check-list li:last-child{ border-bottom:none; }
.check-list input[type=checkbox]{ margin-top:3px; width:16px; height:16px; accent-color: var(--gold); flex:none; }
.check-list label.done{ text-decoration:line-through; color:var(--text-faint); }

/* Table */
table{ width:100%; border-collapse:collapse; font-size:.88rem; }
th,td{ text-align:left; padding:10px 12px; border-bottom:1px solid var(--border); vertical-align:top; }
th{ color:var(--text-faint); font-weight:600; text-transform:uppercase; font-size:.72rem; letter-spacing:.05em; }
tr:hover td{ background: color-mix(in srgb, var(--bg-card) 60%, transparent); }

/* Roadmap tiers */
.tier-block{ border:1px solid var(--border); border-radius:var(--radius-lg); padding:26px; margin-bottom:20px; position:relative; overflow:hidden; }
.tier-block::before{ content:''; position:absolute; left:0; top:0; bottom:0; width:4px; background:var(--accent); }
.tier-block.foundation{ --accent: var(--tier-foundation); }
.tier-block.intermediate{ --accent: var(--tier-intermediate); }
.tier-block.advanced{ --accent: var(--tier-advanced); }
.tier-block.professional{ --accent: var(--tier-professional); }
.tier-num{ font-family:var(--font-mono); font-size:.75rem; color:var(--accent); font-weight:600; }

/* Search modal */
.search-overlay{
  position:fixed; inset:0; background: color-mix(in srgb, black 55%, transparent); z-index:400;
  display:none; align-items:flex-start; justify-content:center; padding:12vh 16px 0;
}
.search-overlay.open{ display:flex; }
.search-box{
  width:100%; max-width:600px; background:var(--bg-elevated); border:1px solid var(--border-strong);
  border-radius:var(--radius-lg); box-shadow:0 24px 60px rgba(0,0,0,.5); overflow:hidden;
}
.search-input-row{ display:flex; align-items:center; gap:10px; padding:14px 18px; border-bottom:1px solid var(--border); }
.search-input-row svg{ width:18px; height:18px; color:var(--text-faint); flex:none; }
#search-input{ flex:1; background:none; border:none; outline:none; color:var(--text); font-size:1rem; font-family:var(--font-body); }
.search-results{ max-height:50vh; overflow-y:auto; padding:8px; }
.search-result{ display:block; padding:10px 12px; border-radius:var(--radius-sm); }
.search-result:hover, .search-result.sel{ background:var(--bg-card); }
.search-result .r-type{ font-size:.68rem; text-transform:uppercase; letter-spacing:.05em; color:var(--gold); font-weight:700; }
.search-result .r-title{ font-weight:600; font-size:.92rem; margin:2px 0; }
.search-result .r-desc{ font-size:.8rem; color:var(--text-faint); }
.search-empty{ padding:30px; text-align:center; color:var(--text-faint); font-size:.9rem; }

/* Footer */
footer{ border-top:1px solid var(--border); padding:40px 0; margin-top:60px; }
.footer-grid{ display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:30px; }
@media (max-width:760px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
.footer-grid h4{ font-size:.78rem; text-transform:uppercase; letter-spacing:.06em; color:var(--text-faint); margin-bottom:12px; }
.footer-grid a{ display:block; font-size:.88rem; color:var(--text-dim); margin-bottom:8px; }
.footer-grid a:hover{ color:var(--gold); }
.footer-bottom{ margin-top:30px; padding-top:20px; border-top:1px solid var(--border); font-size:.78rem; color:var(--text-faint); display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

/* Scroll to top */
#scroll-top-btn{
  position:fixed; bottom:24px; right:24px; z-index:90; width:44px; height:44px; border-radius:50%;
  background:var(--bg-card); border:1px solid var(--border-strong); color:var(--text); display:none;
  place-items:center; box-shadow:var(--shadow-card); transition: all var(--transition);
}
#scroll-top-btn.show{ display:grid; }
#scroll-top-btn:hover{ background:var(--gold); color:#161200; }

/* Toast */
#toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(20px); z-index:400;
  background:var(--bg-elevated); border:1px solid var(--border-strong); color:var(--text); padding:10px 18px;
  border-radius:var(--radius-md); font-size:.85rem; opacity:0; transition: all 220ms ease; box-shadow:var(--shadow-card);
  pointer-events:none;
}
#toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }

/* Utility */
.text-dim{ color:var(--text-dim); }
.text-faint{ color:var(--text-faint); }
.flex{ display:flex; }
.gap-8{ gap:8px; } .gap-12{ gap:12px; }
.mt-0{margin-top:0;} .mb-0{margin-bottom:0;}
.badge-count{ background:var(--bg); border:1px solid var(--border); border-radius:99px; font-size:.68rem; padding:2px 8px; color:var(--text-faint); }
.filter-bar{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:24px; }
.filter-chip{
  font-size:.8rem; padding:7px 14px; border-radius:99px; border:1px solid var(--border); color:var(--text-dim); background:transparent;
}
.filter-chip.active{ background:var(--gold); border-color:var(--gold); color:#161200; font-weight:600; }
.empty-state{ text-align:center; padding:60px 20px; color:var(--text-faint); }

.progress-track{ height:6px; border-radius:99px; background:var(--border); overflow:hidden; }
.progress-fill{ height:100%; background: linear-gradient(90deg, var(--teal), var(--gold)); border-radius:99px; transition: width 300ms ease; }

.related-books-strip{ display:flex; gap:14px; overflow-x:auto; padding-bottom:8px; }
.related-books-strip .card{ min-width:220px; }

.two-col{ display:grid; grid-template-columns: 1fr 1fr; gap:32px; }
@media (max-width:760px){ .two-col{ grid-template-columns:1fr; } }

.notes-area{
  width:100%; min-height:120px; background:var(--bg); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:12px 14px; color:var(--text); font-family:var(--font-body); font-size:.9rem; resize:vertical;
}