@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ━━━━ LIGHT THEME (default) ━━━━━━━━━━━━━━━━━━━━ */
:root {
  --bg:          #F8F8FA;
  --bg1:         #FFFFFF;
  --bg2:         #F2F2F6;
  --bg3:         #EAEAEF;
  --border:      #E4E4EA;
  --border2:     #D0D0DA;
  --text:        #0A0A0F;
  --text2:       #3A3A4A;
  --text3:       #6B6B7E;
  --text4:       #9595A6;
  --text5:       #B8B8C8;
  --indigo:      #5B54F0;
  --indigo2:     #7B75FF;
  --indigo-bg:   rgba(91,84,240,0.07);
  --indigo-bd:   rgba(91,84,240,0.18);
  --green:       #16A34A;
  --green-bg:    rgba(22,163,74,0.07);
  --green-bd:    rgba(22,163,74,0.2);
  --amber:       #D97706;
  --amber-bg:    rgba(217,119,6,0.07);
  --amber-bd:    rgba(217,119,6,0.2);
  --blue:        #2563EB;
  --blue-bg:     rgba(37,99,235,0.07);
  --blue-bd:     rgba(37,99,235,0.2);
  --red:         #DC2626;
  --red-bg:      rgba(220,38,38,0.07);
  --nav-h:       52px;
  --sb-w:        240px;
  --toc-w:       160px;
  --r:           6px;
  --rl:          10px;
  --t:           0.14s ease;
  --shadow:      0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.05);
}

/* ━━━━ DARK THEME ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
[data-theme="dark"] {
  --bg:          #09090C;
  --bg1:         #0F0F14;
  --bg2:         #111118;
  --bg3:         #17171F;
  --border:      #1E1E2A;
  --border2:     #2A2A38;
  --text:        #F0F0F8;
  --text2:       #A8A8C0;
  --text3:       #6E6E88;
  --text4:       #4A4A60;
  --text5:       #32324A;
  --indigo:      #6366F1;
  --indigo2:     #8B8FFF;
  --indigo-bg:   rgba(99,102,241,0.1);
  --indigo-bd:   rgba(99,102,241,0.22);
  --green:       #34D399;
  --green-bg:    rgba(52,211,153,0.08);
  --green-bd:    rgba(52,211,153,0.2);
  --amber:       #FBBF24;
  --amber-bg:    rgba(251,191,36,0.08);
  --amber-bd:    rgba(251,191,36,0.2);
  --blue:        #60A5FA;
  --blue-bg:     rgba(96,165,250,0.08);
  --blue-bd:     rgba(96,165,250,0.2);
  --red:         #F87171;
  --red-bg:      rgba(248,113,113,0.08);
  --shadow:      0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.5);
}

/* ━━━━ RESET ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
*,*::before,*::after { box-sizing:border-box;margin:0;padding:0 }
html { font-size:14px;scroll-behavior:smooth;height:100% }
body {
  font-family:'Plus Jakarta Sans',sans-serif;
  background:var(--bg);color:var(--text);
  line-height:1.65;min-height:100vh;
  -webkit-font-smoothing:antialiased;
  transition:background 0.2s ease,color 0.2s ease;
}
a { color:inherit;text-decoration:none }
button { font-family:inherit;cursor:pointer;border:none;background:none }
::-webkit-scrollbar { width:4px;height:4px }
::-webkit-scrollbar-thumb { background:var(--border2);border-radius:2px }

/* ━━━━ NAV ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.nav {
  position:fixed;top:0;left:0;right:0;z-index:999;
  height:var(--nav-h);
  background:rgba(248,248,250,0.88);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;
  padding:0 22px;gap:0;
  transition:background 0.2s ease,border-color 0.2s ease;
}
[data-theme="dark"] .nav {
  background:rgba(9,9,12,0.88);
}

/* LOGO — product brand */
.nav-logo {
  display:flex;align-items:center;gap:0;
  flex-shrink:0;text-decoration:none;
  margin-right:4px;
}
.logo-mark {
  width:28px;height:28px;
  background:linear-gradient(135deg,#5B54F0 0%,#8B5CF6 100%);
  border-radius:7px;
  display:flex;align-items:center;justify-content:center;
  margin-right:9px;flex-shrink:0;
  box-shadow:0 2px 8px rgba(91,84,240,0.35);
}
.logo-mark svg { width:14px;height:14px }
.logo-text {
  display:flex;flex-direction:column;line-height:1;
}
.logo-name {
  font-size:13.5px;font-weight:700;letter-spacing:-0.025em;
  color:var(--text);
}
.logo-name em { color:var(--indigo);font-style:normal }
.logo-tag {
  font-size:9px;font-weight:500;
  color:var(--text4);letter-spacing:0.04em;
  text-transform:uppercase;margin-top:2px;
}

/* Nav divider */
.nav-div { width:1px;height:18px;background:var(--border2);margin:0 14px;flex-shrink:0 }

.nav-links { display:flex;align-items:center;gap:2px;margin-left:auto }
.nav-link {
  display:flex;align-items:center;gap:5px;
  font-size:12.5px;font-weight:500;
  color:var(--text3);
  padding:5px 12px;border-radius:100px;
  transition:all var(--t);border:1px solid transparent;
  white-space:nowrap;
}
.nav-link svg { width:13px;height:13px;flex-shrink:0 }
.nav-link:hover { background:var(--bg2);color:var(--text2) }
.nav-link.active {
  background:var(--indigo-bg);
  color:var(--indigo);
  border-color:var(--indigo-bd);
  font-weight:600;
}
.nav-link .dot {
  width:4px;height:4px;border-radius:50%;
  background:var(--indigo);display:none;
}
.nav-link.active .dot { display:block }

/* Theme toggle */
.theme-btn {
  width:34px;height:34px;border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;
  background:var(--bg2);border:1px solid var(--border2);
  color:var(--text3);transition:all var(--t);
  margin-left:8px;flex-shrink:0;
  cursor:pointer;
}
.theme-btn:hover { border-color:var(--indigo-bd);color:var(--indigo);background:var(--indigo-bg) }

/* ━━━━ APP SHELL ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.app { display:flex;padding-top:var(--nav-h);min-height:100vh }

/* ━━━━ SIDEBAR ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.sidebar {
  position:fixed;top:var(--nav-h);bottom:0;left:0;
  width:var(--sb-w);
  background:var(--bg1);
  border-right:1px solid var(--border);
  overflow-y:auto;overflow-x:hidden;
  padding:8px 0 40px;z-index:200;
  transition:background 0.2s,border-color 0.2s;
}
.sidebar::-webkit-scrollbar { width:0 }
.sg { margin-bottom:2px }
.sg-head {
  display:flex;align-items:center;justify-content:space-between;
  padding:7px 14px;font-size:10px;font-weight:700;
  letter-spacing:0.1em;text-transform:uppercase;
  color:var(--text4);cursor:pointer;user-select:none;
  transition:color var(--t);
}
.sg-head:hover { color:var(--text3) }
.sg-arr { font-size:9px;opacity:0.5;transition:transform 0.18s }
.sg-arr.open { transform:rotate(90deg) }
.sg-items { list-style:none;display:none }
.sg-items.open { display:block }
.si {
  display:flex;align-items:center;gap:7px;
  padding:6px 14px 6px 18px;
  font-size:12px;font-weight:400;color:var(--text3);
  border-left:2px solid transparent;
  margin:1px 8px 1px 0;
  border-radius:0 var(--r) var(--r) 0;
  cursor:pointer;transition:all var(--t);line-height:1.35;
}
.si:hover { background:var(--bg2);color:var(--text2) }
.si.active {
  background:var(--indigo-bg);color:var(--indigo);
  border-left-color:var(--indigo);font-weight:600;
}
.si.sub { padding-left:26px;font-size:11.5px }
.si-ico { font-size:9px;opacity:0.55;flex-shrink:0 }
.si-badge {
  margin-left:auto;font-size:8px;font-weight:700;
  padding:1px 6px;border-radius:100px;flex-shrink:0;
  letter-spacing:0.04em;
}
.si-badge.new { background:var(--indigo-bg);color:var(--indigo);border:1px solid var(--indigo-bd) }
.si-badge.soon { background:var(--bg3);color:var(--text4);border:1px solid var(--border2) }

/* ━━━━ MAIN / CONTENT ━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.main { margin-left:var(--sb-w);flex:1;min-width:0;display:flex }
.content { flex:1;min-width:0;padding:34px calc(var(--toc-w) + 24px) 100px 38px }

/* ━━━━ TOC ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.toc {
  width:var(--toc-w);flex-shrink:0;
  position:fixed;top:var(--nav-h);right:0;
  height:calc(100vh - var(--nav-h));
  overflow-y:auto;padding:20px 10px;
  border-left:1px solid var(--border);
  transition:border-color 0.2s;
}
.toc-lbl {
  font-size:9px;font-weight:700;letter-spacing:0.1em;
  text-transform:uppercase;color:var(--text4);margin-bottom:10px;
}
.toc-list { list-style:none }
.toc-list li { margin-bottom:2px }
.toc-list a {
  display:block;font-size:11.5px;color:var(--text4);
  padding:4px 8px;border-radius:var(--r);
  border-left:2px solid transparent;transition:all var(--t);
}
.toc-list a:hover { color:var(--text2);background:var(--bg2) }
.toc-list a.active { color:var(--indigo);border-left-color:var(--indigo);background:var(--indigo-bg) }

/* ━━━━ PAGE HEADER ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.pg-head { padding-bottom:22px;border-bottom:1px solid var(--border);margin-bottom:0 }
.breadcrumb {
  display:flex;align-items:center;gap:6px;
  font-size:11.5px;color:var(--text4);margin-bottom:14px;
}
.breadcrumb a { color:var(--text4);transition:color var(--t) }
.breadcrumb a:hover { color:var(--indigo) }
.breadcrumb span { color:var(--border2);font-size:10px }
.pg-meta { display:flex;align-items:center;gap:5px;flex-wrap:wrap;margin-bottom:10px }
.pg-title {
  font-size:26px;font-weight:700;
  letter-spacing:-0.03em;line-height:1.15;
  color:var(--text);margin-bottom:8px;
}
.pg-desc { font-size:13.5px;color:var(--text3);line-height:1.65;max-width:560px }
.pg-badges { display:flex;gap:6px;flex-wrap:wrap;margin-top:12px }

/* ━━━━ TAGS / BADGES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.tag {
  display:inline-flex;align-items:center;
  font-size:9.5px;font-weight:700;
  letter-spacing:0.05em;text-transform:uppercase;
  padding:2px 8px;border-radius:100px;
  border:1px solid transparent;
}
.tag-i { background:var(--indigo-bg);color:var(--indigo);border-color:var(--indigo-bd) }
.tag-g { background:var(--green-bg);color:var(--green);border-color:var(--green-bd) }
.tag-a { background:var(--amber-bg);color:var(--amber);border-color:var(--amber-bd) }
.tag-b { background:var(--blue-bg);color:var(--blue);border-color:var(--blue-bd) }
.tag-d { background:var(--bg2);color:var(--text4);border-color:var(--border2) }
.badge {
  display:inline-flex;align-items:center;
  font-family:'JetBrains Mono',monospace;font-size:10.5px;
  font-weight:500;padding:3px 10px;border-radius:var(--r);
}
.bdg-t { background:var(--amber-bg);color:var(--amber) }
.bdg-s { background:var(--green-bg);color:var(--green) }
.bdg-d { background:var(--bg3);color:var(--text3) }

/* ━━━━ SECTION HEADINGS ━━━━━━━━━━━━━━━━━━━━━━━━━ */
.sh2 {
  font-size:16px;font-weight:700;letter-spacing:-0.02em;
  color:var(--text);margin:34px 0 10px;
  padding-top:34px;border-top:1px solid var(--border);
  scroll-margin-top:68px;
}
.sh2:first-of-type { border-top:none;padding-top:0;margin-top:22px }
.sh3 { font-size:13px;font-weight:650;color:var(--text);margin:18px 0 6px;scroll-margin-top:68px }
.body-text { font-size:13.5px;color:var(--text3);line-height:1.75;margin-bottom:10px }
.body-list { margin:6px 0 12px 20px;font-size:13.5px;color:var(--text3);line-height:1.7 }
.body-list li { margin-bottom:4px }
code {
  font-family:'JetBrains Mono',monospace;font-size:12px;
  background:var(--bg2);color:var(--indigo);
  padding:1px 6px;border-radius:4px;
  border:1px solid var(--border2);
}

/* ━━━━ CODE BLOCKS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.codeblock {
  background:var(--bg2);border:1px solid var(--border2);
  border-radius:var(--rl);margin:10px 0 16px;
  overflow:hidden;box-shadow:var(--shadow);
}
.cb-head {
  display:flex;align-items:center;gap:6px;
  padding:8px 14px;
  background:var(--bg3);border-bottom:1px solid var(--border2);
}
.cb-dots { display:flex;gap:5px }
.cb-dot { width:10px;height:10px;border-radius:50% }
.cb-lang {
  font-family:'JetBrains Mono',monospace;font-size:9px;
  font-weight:600;color:var(--text4);letter-spacing:0.08em;
  text-transform:uppercase;margin-left:auto;
}
.codeblock pre { padding:16px 18px;overflow-x:auto;font-size:12.5px;line-height:1.7;margin:0 }
.codeblock pre code {
  font-family:'JetBrains Mono',monospace;color:var(--text);
  background:none;padding:0;border:none;font-size:inherit;
}
[data-theme="dark"] .codeblock { background:#0D0D14;border-color:#1E1E2A }
[data-theme="dark"] .cb-head { background:#111118 }

/* Syntax */
.kw { color:#7C3AED } .fn { color:#2563EB } .st { color:#059669 }
.cm { color:var(--text5) } .nm { color:#D97706 } .tp { color:#BE185D }
[data-theme="dark"] .kw { color:#A78BFA } [data-theme="dark"] .fn { color:#60A5FA }
[data-theme="dark"] .st { color:#34D399 } [data-theme="dark"] .nm { color:#FBBF24 }

/* ━━━━ DRY RUN ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.dryblock {
  background:var(--bg1);
  border:1px solid var(--border2);
  border-left:3px solid var(--indigo-bd);
  border-radius:0 var(--rl) var(--rl) 0;
  padding:14px 18px;margin:10px 0 16px;overflow-x:auto;
}
.dryblock pre {
  font-family:'JetBrains Mono',monospace;font-size:11.5px;
  line-height:1.85;color:var(--text3);margin:0;white-space:pre;
}

/* ━━━━ CALLOUTS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.callout {
  display:flex;gap:10px;padding:11px 14px;
  border-radius:var(--rl);margin:10px 0 14px;
  font-size:13px;line-height:1.6;
  border:1px solid transparent;
}
.callout-ico { flex-shrink:0;font-size:14px;margin-top:1px }
.callout-body { color:var(--text3) }
.callout-body strong { color:var(--text) }
.callout.info { background:var(--indigo-bg);border-color:var(--indigo-bd) }
.callout.ok { background:var(--green-bg);border-color:var(--green-bd) }
.callout.warn { background:var(--amber-bg);border-color:var(--amber-bd) }
.callout.tip { background:var(--blue-bg);border-color:var(--blue-bd) }

/* ━━━━ TABLES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.tbl { overflow-x:auto;margin:10px 0 16px;border-radius:var(--rl);border:1px solid var(--border2);box-shadow:var(--shadow) }
table { width:100%;border-collapse:collapse;font-size:12.5px }
thead tr { background:var(--bg2) }
th {
  padding:9px 14px;text-align:left;font-size:9.5px;font-weight:700;
  letter-spacing:0.08em;text-transform:uppercase;color:var(--text4);
  border-bottom:1px solid var(--border2);white-space:nowrap;
}
td { padding:9px 14px;color:var(--text3);border-bottom:1px solid var(--border);vertical-align:top }
tbody tr:last-child td { border-bottom:none }
tbody tr:hover td { background:var(--bg2) }

/* ━━━━ PREV/NEXT ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.pgnav {
  display:flex;justify-content:space-between;gap:12px;
  margin-top:48px;padding-top:22px;border-top:1px solid var(--border);
}
.pgnav a {
  display:flex;flex-direction:column;gap:3px;
  padding:12px 16px;flex:1;max-width:48%;
  background:var(--bg1);border:1px solid var(--border2);
  border-radius:var(--rl);transition:all var(--t);
  box-shadow:var(--shadow);
}
.pgnav a:hover { border-color:var(--indigo);background:var(--indigo-bg);box-shadow:none }
.pgnav a .dir { font-size:9.5px;color:var(--text4);text-transform:uppercase;letter-spacing:0.08em }
.pgnav a .ttl { font-size:12.5px;font-weight:600;color:var(--text) }
.pgnav a:hover .ttl { color:var(--indigo) }
.pgnav .next { text-align:right }

/* ━━━━ INDEX CARDS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.idx-grid { display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px;margin:12px 0 }
.idx-card {
  display:block;padding:16px;
  background:var(--bg1);border:1px solid var(--border2);
  border-radius:var(--rl);transition:all var(--t);
  box-shadow:var(--shadow);
}
.idx-card:hover { border-color:var(--indigo);background:var(--indigo-bg);transform:translateY(-2px);box-shadow:var(--shadow-md) }
.idx-card-ico { font-size:16px;margin-bottom:8px }
.idx-card h3 { font-size:12.5px;font-weight:650;color:var(--text);margin-bottom:4px;line-height:1.3 }
.idx-card p { font-size:11.5px;color:var(--text4);line-height:1.5 }
.idx-card-ft { display:flex;align-items:center;justify-content:space-between;margin-top:10px;font-size:10px;color:var(--text4) }
.idx-card:hover .idx-card-ft { color:var(--indigo) }

/* ━━━━ SECTION LABELS ━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.sec-row { display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid var(--border) }
.sec-lbl { font-size:9.5px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--text4) }
.sec-link { font-size:11.5px;color:var(--indigo);font-weight:500 }
.sec-link:hover { color:var(--indigo2) }
.divider { height:1px;background:var(--border);margin:20px 0 }

/* ━━━━ HOME ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.home-wrap { width:100% }

/* Hero — 2 col */
.hero {
  display:grid;grid-template-columns:1fr 1fr;
  min-height:calc(100vh - var(--nav-h));
  border-bottom:1px solid var(--border);
  position:relative;
}
.hero-l {
  display:flex;flex-direction:column;justify-content:center;
  padding:52px 44px 52px 48px;
  position:relative;overflow:hidden;
}
.hero-l::before {
  content:'';position:absolute;top:5%;left:-120px;
  width:500px;height:500px;
  background:radial-gradient(circle,rgba(91,84,240,0.05) 0%,transparent 65%);
  pointer-events:none;
}
.hero-eyebrow {
  display:inline-flex;align-items:center;gap:6px;
  font-size:10px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--indigo);background:var(--indigo-bg);
  border:1px solid var(--indigo-bd);
  padding:4px 12px;border-radius:100px;
  margin-bottom:22px;width:fit-content;
}
.hero-eyebrow::before { content:'';width:5px;height:5px;border-radius:50%;background:var(--indigo);animation:dot-pulse 2.5s ease infinite }
@keyframes dot-pulse {
  0%,100% { opacity:1 }
  50% { opacity:0.3 }
}
.hero-h1 {
  font-size:clamp(28px,3.8vw,44px);
  font-weight:700;letter-spacing:-0.04em;line-height:1.1;
  color:var(--text);margin-bottom:16px;
}
.hero-h1 .grad {
  background:linear-gradient(135deg,var(--indigo) 0%,#8B5CF6 60%,#EC4899 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero-p { font-size:14px;color:var(--text3);line-height:1.72;max-width:390px;margin-bottom:28px }
.hero-btns { display:flex;flex-wrap:wrap;gap:10px;margin-bottom:36px }
.btn-p {
  display:inline-flex;align-items:center;gap:6px;
  background:var(--indigo);color:#fff;
  padding:10px 22px;border-radius:100px;
  font-size:13px;font-weight:600;border:none;
  transition:all var(--t);
  box-shadow:0 2px 12px rgba(91,84,240,0.35);
}
.btn-p:hover { background:#4845CC;box-shadow:0 4px 20px rgba(91,84,240,0.5);transform:translateY(-1px) }
.btn-g {
  display:inline-flex;align-items:center;gap:6px;
  background:transparent;color:var(--text2);
  padding:10px 22px;border-radius:100px;
  font-size:13px;font-weight:500;
  border:1px solid var(--border2);transition:all var(--t);
}
.btn-g:hover { border-color:var(--indigo-bd);color:var(--indigo);background:var(--indigo-bg) }
.btn-wa {
  display:inline-flex;align-items:center;gap:6px;
  background:#25d366;color:#fff;
  padding:10px 20px;border-radius:100px;
  font-size:13px;font-weight:600;
  border:1px solid transparent;
  transition:all var(--t);
  text-decoration:none;
}
.btn-wa:hover { background:#1ebe5d;transform:translateY(-1px);box-shadow:0 4px 16px rgba(37,211,102,0.4) }
.hero-stats { display:flex;gap:28px }
.stat-n { font-size:20px;font-weight:700;color:var(--text);letter-spacing:-0.03em }
.stat-n em { color:var(--indigo);font-style:normal }
.stat-l { font-size:11px;color:var(--text4);margin-top:2px }

/* Hero canvas side */
.hero-r {
  position:relative;overflow:hidden;
  background:var(--bg);
  border-left:none;
}
#hero-canvas { width:100%;height:100%;display:block;position:absolute;inset:0 }
.canvas-bar {
  position:absolute;bottom:0;left:0;right:0;height:32px;
  background:rgba(9,9,12,0.85);
  border-top:1px solid rgba(255,255,255,0.06);
  display:flex;align-items:center;padding:0 14px;gap:12px;z-index:2;
  backdrop-filter:blur(8px);
}
/* light mode canvas bar */
:root .canvas-bar {
  background:rgba(248,248,250,0.88);
  border-top:1px solid var(--border);
}
[data-theme="dark"] .canvas-bar {
  background:rgba(9,9,12,0.88);
  border-top:1px solid rgba(255,255,255,0.06);
}
.cb-live { display:flex;align-items:center;gap:5px }
.cb-live-dot { width:5px;height:5px;border-radius:50%;background:var(--green);box-shadow:0 0 6px var(--green);animation:live-blink 2s ease infinite }
@keyframes live-blink { 0%,100%{opacity:1} 50%{opacity:0.4} }
.cb-text { font-size:9px;font-family:'JetBrains Mono',monospace;letter-spacing:0.05em;color:var(--text3) }
.cb-sep { width:1px;height:12px;background:rgba(255,255,255,0.08) }
.cb-pill {
  font-size:8px;font-family:'JetBrains Mono',monospace;letter-spacing:0.04em;
  background:var(--indigo-bg);border:1px solid var(--indigo-bd);
  color:var(--indigo);padding:2px 8px;border-radius:100px;margin-left:auto;
}

/* Home body */
.home-body { max-width:1080px;margin:0 auto;padding:40px 32px }
.topic-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:32px }
.topic-card {
  background:var(--bg1);border:1px solid var(--border2);
  border-radius:12px;padding:20px;
  transition:all var(--t);display:block;
  box-shadow:var(--shadow);
}
.topic-card:hover { border-color:var(--indigo-bd);transform:translateY(-3px);box-shadow:var(--shadow-md) }
.tc-ico {
  width:36px;height:36px;border-radius:9px;
  display:flex;align-items:center;justify-content:center;
  font-size:16px;margin-bottom:14px;
  background:var(--indigo-bg);border:1px solid var(--indigo-bd);
}
.topic-card h3 { font-size:13.5px;font-weight:700;color:var(--text);margin-bottom:6px;letter-spacing:-0.01em }
.topic-card p { font-size:12px;color:var(--text4);line-height:1.55;margin-bottom:14px }
.tc-ft { display:flex;align-items:center;justify-content:space-between }
.tc-arr { font-size:12px;color:var(--text4);transition:all var(--t) }
.topic-card:hover .tc-arr { color:var(--indigo);transform:translateX(3px) }
.recent-list { list-style:none }
.recent-item {
  display:flex;align-items:center;gap:10px;
  padding:10px 0;border-bottom:1px solid var(--border);
  transition:padding var(--t);
}
.recent-item:last-child { border-bottom:none }
.recent-item:hover { padding-left:4px }
.r-dot { width:3px;height:3px;border-radius:50%;background:var(--border2);flex-shrink:0 }
.recent-item a { font-size:13px;font-weight:500;color:var(--text2);flex:1 }
.recent-item a:hover { color:var(--indigo) }
.r-tags { display:flex;gap:5px;flex-shrink:0 }

/* ━━━━ CONTACT PAGE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.contact-wrap { max-width:940px;margin:0 auto;padding:60px 40px 100px }
.contact-eyebrow {
  display:inline-flex;align-items:center;gap:6px;
  font-size:10px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--indigo);background:var(--indigo-bg);border:1px solid var(--indigo-bd);
  padding:4px 12px;border-radius:100px;margin-bottom:20px;
}
.contact-title { font-size:clamp(24px,3vw,38px);font-weight:700;letter-spacing:-0.03em;color:var(--text);margin-bottom:10px }
.contact-sub { font-size:14px;color:var(--text3);line-height:1.72;max-width:480px;margin-bottom:48px }
.contact-body { display:grid;grid-template-columns:1fr 1.55fr;gap:28px;align-items:start }
.contact-info-stack { display:flex;flex-direction:column;gap:10px }
.contact-info-hdg { font-size:10px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--text4);margin-bottom:4px }
.contact-card {
  display:flex;align-items:center;gap:14px;
  padding:13px 16px;background:var(--bg);
  border:1px solid var(--border);border-radius:var(--rl);
  transition:all var(--t);text-decoration:none;color:inherit;
}
.contact-card:hover { border-color:var(--indigo-bd);background:var(--indigo-bg);transform:translateY(-1px);box-shadow:var(--shadow) }
.contact-ico {
  width:34px;height:34px;border-radius:8px;
  background:var(--indigo-bg);border:1px solid var(--indigo-bd);
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;font-size:14px;
}
.contact-card-lbl { font-size:9.5px;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--text4);margin-bottom:2px }
.contact-card-val { font-size:12.5px;color:var(--text2);font-weight:500;word-break:break-all }
/* Form box */
.contact-form-box {
  background:var(--bg);border:1px solid var(--border);
  border-radius:var(--rl);padding:28px 28px 24px;box-shadow:var(--shadow);
}
.contact-form-hdg { font-size:14px;font-weight:700;color:var(--text);margin-bottom:20px }
.form-row { display:grid;grid-template-columns:1fr 1fr;gap:14px }
.form-group { display:flex;flex-direction:column;gap:5px;margin-bottom:14px }
.form-label { font-size:10.5px;font-weight:600;letter-spacing:0.04em;color:var(--text3) }
.form-input,.form-textarea {
  font-family:inherit;font-size:13px;color:var(--text);
  background:var(--bg2);border:1px solid var(--border2);
  border-radius:var(--r);padding:9px 12px;outline:none;
  transition:border-color var(--t),box-shadow var(--t);
  width:100%;box-sizing:border-box;
}
.form-input:focus,.form-textarea:focus { border-color:var(--indigo);box-shadow:0 0 0 3px rgba(91,84,240,0.1) }
.form-input::placeholder,.form-textarea::placeholder { color:var(--text4) }
.form-textarea { resize:vertical;min-height:118px;line-height:1.6 }
.form-footer { display:flex;align-items:center;justify-content:space-between;margin-top:6px;gap:12px }
.form-note { font-size:11px;color:var(--text4) }
.form-success {
  display:none;margin-top:14px;
  background:rgba(34,197,94,0.07);border:1px solid rgba(34,197,94,0.25);
  border-radius:var(--r);padding:10px 14px;
  font-size:13px;color:var(--green);
}

/* ━━━━ DSA SERIES PILL (home page card) ━━━━━━━━ */
.dsa-series-pill {
  display:inline-flex;align-items:center;gap:4px;
  font-size:11px;font-weight:600;
  background:var(--indigo-bg);color:var(--indigo);
  border:1px solid var(--indigo-bd);
  padding:3px 10px;border-radius:99px;
  text-decoration:none;transition:all var(--t);
}
.dsa-series-pill:hover {
  background:var(--indigo);color:#fff;
  border-color:var(--indigo);
}

/* ━━━━ HAMBURGER — hidden on desktop ━━━━━━━━━━━━ */
.nav-ham { display:none }

/* ━━━━ NAV DROPDOWN SUBMENU ━━━━━━━━━━━━━━━━━━━━ */
.nav-link-wrap {
  position:relative;
  display:flex;
  align-items:center;
}
/* small arrow indicator on the parent link */
.nav-link-wrap > .nav-link::after {
  content:'›';
  font-size:10px;
  margin-left:3px;
  opacity:.5;
  transition:transform .15s;
  display:inline-block;
}
.nav-link-wrap:hover > .nav-link::after { transform:rotate(90deg); opacity:1 }

/* invisible bridge so hover isn't lost between link and panel */
.nav-link-wrap::before {
  content:'';position:absolute;
  top:100%;left:-10px;right:-10px;height:12px;
}
/* the dropdown panel */
.nav-dropdown {
  position:absolute;
  top:calc(100% + 10px);
  left:50%;
  transform:translateX(-50%) translateY(-4px);
  background:var(--bg1);
  border:1px solid var(--border);
  border-radius:12px;
  padding:6px;
  min-width:185px;
  box-shadow:var(--shadow-md);
  opacity:0;
  pointer-events:none;
  transition:opacity .15s, transform .15s;
  z-index:997;
}
.nav-link-wrap:hover .nav-dropdown {
  opacity:1;
  pointer-events:auto;
  transform:translateX(-50%) translateY(0);
}
/* tiny label above items */
.nav-dd-label {
  font-size:9px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text4);padding:4px 10px 6px;
}
/* each sub-link */
.nav-dd-item {
  display:flex;align-items:center;gap:8px;
  padding:7px 10px;border-radius:8px;
  font-size:12.5px;font-weight:500;
  color:var(--text2);text-decoration:none;
  transition:all var(--t);white-space:nowrap;
}
.nav-dd-item:hover { background:var(--indigo-bg);color:var(--indigo) }
.nav-dd-badge {
  margin-left:auto;font-size:9px;font-weight:700;letter-spacing:.04em;
  background:var(--indigo-bg);color:var(--indigo);
  border:1px solid var(--indigo-bd);
  padding:1px 6px;border-radius:99px;
}
/* soon / disabled item */
.nav-dd-item.soon { opacity:.45;cursor:default;pointer-events:none }
.nav-dd-sep { height:1px;background:var(--border);margin:4px 6px }

/* ── mobile: dropdown becomes flat inline list ── */
@media(max-width:680px){
  .nav-link-wrap { flex-direction:column;align-items:stretch;width:100% }
  .nav-link-wrap > .nav-link::after { display:none }
  .nav-dropdown {
    position:static;transform:none !important;
    opacity:1 !important;pointer-events:auto !important;
    box-shadow:none;border:none;border-radius:0;
    background:transparent;padding:0;min-width:0;
  }
  .nav-dd-label { display:none }
  .nav-dd-item {
    padding:9px 14px 9px 28px;
    font-size:13px;color:var(--text3);
    border-radius:10px;
  }
  .nav-dd-sep { display:none }
}

/* ━━━━ RESPONSIVE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
@media(max-width:1200px) { .toc{display:none} .content{padding-right:38px} }
@media(max-width:900px) {
  .hero { grid-template-columns:1fr }
  .hero-r { height:320px;border-left:none;border-top:1px solid var(--border) }
  .hero-l { padding:40px 28px }
  .topic-grid { grid-template-columns:1fr 1fr }
}
@media(max-width:700px) {
  /* ── layout ── */
  .contact-body        { grid-template-columns:1fr; gap:20px }
  .contact-wrap        { padding:28px 16px 60px }

  /* ── header text ── */
  .contact-title       { font-size:26px }
  .contact-sub         { font-size:13.5px; margin-bottom:24px; max-width:100% }

  /* ── info cards ── */
  .contact-card        { padding:11px 14px; gap:12px }
  .contact-ico         { width:30px; height:30px }
  .contact-card-val    { font-size:12px }

  /* ── form box ── */
  .contact-form-box    { padding:20px 16px 18px }
  .form-row            { grid-template-columns:1fr }

  /* ── footer row: stack note above full-width button ── */
  .form-footer {
    flex-direction:column;
    align-items:stretch;
    gap:10px;
  }
  .form-note           { text-align:center }
  .form-footer .btn-p  { width:100%; justify-content:center; padding:11px 16px; font-size:13.5px }
}
@media(max-width:680px) {
  :root { --sb-w:0px }
  .sidebar { transform:translateX(-100%);transition:transform 0.2s;width:240px }
  .sidebar.open { transform:translateX(0) }
  .content { padding:22px 20px 80px }

  /* ── Home page ── */
  .home-body { padding:24px 16px 40px }
  .topic-grid { grid-template-columns:1fr }

  /* Hero */
  .hero { min-height:auto }
  .hero-l { padding:28px 18px 20px }
  .hero-h1 { font-size:28px;margin-bottom:12px }
  .hero-p  { font-size:13px;margin-bottom:18px;max-width:100% }
  .hero-r  { height:200px }

  /* Hero buttons — DSA+SystemDesign on row 1, WhatsApp full-width row 2 */
  .hero-btns { gap:8px;margin-bottom:20px;flex-wrap:wrap }
  .btn-p,.btn-g { padding:9px 14px;font-size:12.5px }
  .btn-wa { width:100%;justify-content:center;padding:11px 14px;font-size:13px }

  /* Stats — tighter */
  .hero-stats { gap:16px }
  .stat-n  { font-size:17px }
  .stat-l  { font-size:10.5px }

  /* Topic cards */
  .topic-card { padding:16px }
  .topic-card h3 { font-size:13px }
  .topic-card p  { font-size:11.5px }

  /* Section rows */
  .sec-row { margin-top:4px }

  /* Recent list — hide tags on very narrow screens */
  .recent-item { gap:8px;padding:9px 0 }
  .recent-item a { font-size:12.5px }
  .r-tags { display:none }

  /* ── hide horizontal nav links & divider ── */
  .nav-div  { display:none }
  .nav-links {
    /* removed from flex row; becomes a slide-down panel */
    display:none;
    position:fixed;
    top:var(--nav-h);left:0;right:0;
    background:var(--bg1);
    border-bottom:1px solid var(--border);
    flex-direction:column;
    padding:10px 14px 16px;
    gap:4px;
    z-index:998;
    box-shadow:0 8px 28px rgba(0,0,0,0.13);
    margin-left:0;
  }
  .nav-links.mobile-open {
    display:flex;
    animation:navSlideDown .18s ease;
  }
  @keyframes navSlideDown {
    from { opacity:0; transform:translateY(-10px) }
    to   { opacity:1; transform:translateY(0) }
  }
  .nav-links .nav-link {
    padding:11px 14px;
    border-radius:10px;
    font-size:14px;
    width:100%;
    justify-content:flex-start;
    gap:10px;
  }
  .nav-links .nav-link svg { width:15px;height:15px }

  /* ── hamburger button ── */
  .nav-ham {
    display:flex;
    align-items:center;justify-content:center;
    width:34px;height:34px;
    border-radius:8px;
    background:var(--bg2);
    border:1px solid var(--border2);
    cursor:pointer;
    margin-left:auto;   /* push to right */
    color:var(--text3);
    flex-shrink:0;
    transition:all var(--t);
  }
  .nav-ham.open {
    background:var(--indigo-bg);
    border-color:var(--indigo-bd);
    color:var(--indigo);
  }
}

/* ━━━━ VERY SMALL PHONES  ≤ 380px ━━━━━━━━━━━━━━━ */
@media(max-width:380px) {
  .hero-h1   { font-size:24px }
  .hero-l    { padding:22px 14px 16px }
  .home-body { padding:18px 14px 36px }
  .btn-p,.btn-g { font-size:12px;padding:9px 12px }
  .btn-wa    { font-size:12px }
  .hero-stats { gap:10px }
  .stat-n    { font-size:15px }
  .hero-r    { height:160px }
  .topic-card{ padding:14px }
}