/* ── RESET & BASE ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #080b12;
  --surface:   #0d1120;
  --surface2:  #111827;
  --surface3:  #161d2e;
  --border:    #1e2a40;
  --border-h:  #2a3a58;

  --blue:      #4d8ef5;
  --blue-dim:  rgba(77,142,245,0.12);
  --blue-glow: rgba(77,142,245,0.18);

  --green:     #34d48a;
  --green-dim: rgba(52,212,138,0.12);
  --green-glow:rgba(52,212,138,0.18);

  --amber:     #f5a623;
  --amber-dim: rgba(245,166,35,0.12);
  --amber-glow:rgba(245,166,35,0.18);

  --red:       #e05c6b;
  --red-dim:   rgba(224,92,107,0.12);
  --red-glow:  rgba(224,92,107,0.18);

  --violet:    #a78bfa;
  --violet-dim:rgba(167,139,250,0.12);
  --violet-glow:rgba(167,139,250,0.18);

  --text:      #c9d5ee;
  --text-dim:  #637899;
  --text-muted:#3d4f6a;
  --text-bright:#eef2ff;

  --radius:    10px;
  --radius-sm: 6px;
  --transition: 180ms cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Plus Jakarta Sans', 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
  min-height: 100vh;
}

/* subtle noise overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ── HEADER ───────────────────────────────────────────────────── */
.header {
  position: relative;
  padding: 52px 48px 40px;
  background: linear-gradient(160deg, #0d1425 0%, var(--bg) 70%);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  z-index: 1;
}
.header-glow {
  position: absolute;
  top: -120px; left: -60px;
  width: 500px; height: 400px;
  background: radial-gradient(ellipse, rgba(77,142,245,0.07) 0%, transparent 65%);
  pointer-events: none;
}
.header-glow2 {
  position: absolute;
  top: -60px; right: -80px;
  width: 360px; height: 300px;
  background: radial-gradient(ellipse, rgba(52,212,138,0.05) 0%, transparent 65%);
  pointer-events: none;
}
.header-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.header-eyebrow-line {
  width: 24px; height: 1px;
  background: var(--blue);
}
.header-eyebrow span {
  font-family: 'JetBrains Mono', 'Cascadia Code', monospace;
  font-size: 10px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--blue);
}
.header h1 {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-bright);
  letter-spacing: -0.6px;
  line-height: 1.2;
  margin-bottom: 10px;
}
.header-sub {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.header-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
}
.header-tag svg { flex-shrink: 0; }

/* ── NAV ──────────────────────────────────────────────────────── */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 11, 18, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 48px;
  display: flex;
  gap: 2px;
}
.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: 'Plus Jakarta Sans', 'Segoe UI', sans-serif;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
  position: relative;
}
.nav-btn svg { transition: color var(--transition); }
.nav-btn:hover { color: var(--text); }
.nav-btn:hover svg { color: var(--text); }
.nav-btn.active { color: var(--text-bright); border-bottom-color: var(--blue); }
.nav-btn.active svg { color: var(--blue); }
.nav-btn.active-green { color: var(--text-bright); border-bottom-color: var(--green); }
.nav-btn.active-green svg { color: var(--green); }
.nav-btn.active-amber { color: var(--text-bright); border-bottom-color: var(--amber); }
.nav-btn.active-amber svg { color: var(--amber); }

/* ── MAIN LAYOUT ─────────────────────────────────────────────── */
.main {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 48px 100px;
}
.section { display: none; }
.section.active { display: block; animation: fadeIn 0.22s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ── SECTION TITLE ────────────────────────────────────────────── */
.sec-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.sec-icon {
  width: 42px; height: 42px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  border: 1px solid;
}
.sec-icon.blue  { background: var(--blue-dim);   border-color: rgba(77,142,245,0.25);  color: var(--blue); }
.sec-icon.green { background: var(--green-dim);  border-color: rgba(52,212,138,0.25);  color: var(--green); }
.sec-icon.amber { background: var(--amber-dim);  border-color: rgba(245,166,35,0.25);  color: var(--amber); }
.sec-head h2 {
  font-size: 21px;
  font-weight: 800;
  color: var(--text-bright);
  letter-spacing: -0.3px;
}
.sec-head p { font-size: 13px; color: var(--text-dim); margin-top: 2px; }

/* ── BLOCK TITLE ──────────────────────────────────────────────── */
.block-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 32px 0 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-bright);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.block-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.block-title svg { flex-shrink: 0; }
.block-title.blue  svg { color: var(--blue); }
.block-title.green svg { color: var(--green); }
.block-title.amber svg { color: var(--amber); }
.block-title.red   svg { color: var(--red); }
.block-title.violet svg { color: var(--violet); }

/* ── HIGHLIGHT BOX ────────────────────────────────────────────── */
.hl {
  display: flex;
  gap: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 16px;
  margin-bottom: 22px;
  font-size: 13.5px;
  color: var(--text);
  transition: border-color var(--transition), background var(--transition);
}
.hl:hover { background: var(--surface3); border-left-color: var(--blue); }
.hl.green { border-left-color: var(--green); }
.hl.amber { border-left-color: var(--amber); }
.hl.red   { border-left-color: var(--red); }
.hl-icon { flex-shrink: 0; margin-top: 1px; }
.hl.blue  .hl-icon { color: var(--blue); }
.hl.green .hl-icon { color: var(--green); }
.hl.amber .hl-icon { color: var(--amber); }
.hl.red   .hl-icon { color: var(--red); }
.hl p strong { color: var(--text-bright); }

/* ── CARD GRID ────────────────────────────────────────────────── */
.grid  { display: grid; gap: 14px; margin-bottom: 22px; }
.g2    { grid-template-columns: repeat(2, 1fr); }
.g3    { grid-template-columns: repeat(3, 1fr); }
.g4    { grid-template-columns: repeat(4, 1fr); }
.gauto { grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); }

/* ── CARDS ────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition),
    background var(--transition);
  cursor: pointer;
  text-decoration: none; /* for links */
  display: block;
}
.card:hover {
  border-color: var(--border-h);
  background: var(--surface2);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
/* accent variants - top border strip on hover */
.card.c-blue:hover  { border-color: rgba(77,142,245,0.55);  box-shadow: 0 8px 28px rgba(77,142,245,0.1); }
.card.c-green:hover { border-color: rgba(52,212,138,0.55);  box-shadow: 0 8px 28px rgba(52,212,138,0.1); }
.card.c-amber:hover { border-color: rgba(245,166,35,0.55);  box-shadow: 0 8px 28px rgba(245,166,35,0.1); }
.card.c-red:hover   { border-color: rgba(224,92,107,0.55);  box-shadow: 0 8px 28px rgba(224,92,107,0.1); }
.card.c-violet:hover{ border-color: rgba(167,139,250,0.55); box-shadow: 0 8px 28px rgba(167,139,250,0.1);}

.card-icon-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.card-icon-wrap {
  width: 30px; height: 30px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.card-icon-wrap.blue   { background: var(--blue-dim);   color: var(--blue); }
.card-icon-wrap.green  { background: var(--green-dim);  color: var(--green); }
.card-icon-wrap.amber  { background: var(--amber-dim);  color: var(--amber); }
.card-icon-wrap.red    { background: var(--red-dim);    color: var(--red); }
.card-icon-wrap.violet { background: var(--violet-dim); color: var(--violet); }

.card-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
}
.card h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
  line-height: 1.3;
}
.card p, .card li {
  font-size: 13px;
  color: var(--text);
  line-height: 1.62;
}
.card ul { padding-left: 16px; }
.card li { margin-bottom: 3px; }
.card code {
  font-family: 'JetBrains Mono', 'Cascadia Code', monospace;
  font-size: 11px;
  background: var(--surface3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--blue);
}

/* ── CODE BLOCK ───────────────────────────────────────────────── */
.code-block {
  background: #050810;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-family: 'JetBrains Mono', 'Cascadia Code', monospace;
  font-size: 12px;
  line-height: 1.75;
  color: var(--green);
  overflow-x: auto;
  white-space: pre;
  transition: border-color var(--transition);
}
.code-block:hover { border-color: var(--border-h); }
.ck  { color: var(--blue); }
.cs  { color: var(--amber); }
.cc  { color: var(--text-muted); font-style: italic; }
.cg  { color: var(--green); }

/* ── TABLE ────────────────────────────────────────────────────── */
.tbl {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 13px;
}
.tbl th {
  background: var(--surface2);
  color: var(--text-bright);
  font-weight: 700;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
  font-size: 12px;
  letter-spacing: 0.3px;
}
.tbl td {
  padding: 9px 14px;
  border: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
  transition: background var(--transition);
}
.tbl tr:hover td { background: var(--surface2); }
.tbl .ok  { color: var(--green); }
.tbl .nok { color: var(--red); }

/* ── STEP LIST ────────────────────────────────────────────────── */
.steps { list-style: none; margin-bottom: 22px; display: flex; flex-direction: column; gap: 8px; }
.step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.step:hover {
  border-color: rgba(77,142,245,0.4);
  background: var(--surface2);
  transform: translateX(3px);
}
.step-n {
  width: 28px; height: 28px; flex-shrink: 0;
  background: var(--blue-dim);
  border: 1px solid rgba(77,142,245,0.3);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; color: var(--blue);
  font-family: 'JetBrains Mono', monospace;
}
.step-body strong { display: block; color: var(--text-bright); font-weight: 600; margin-bottom: 2px; font-size: 13.5px; }
.step-body span { font-size: 13px; color: var(--text-dim); }

/* ── MEMORY BOX ───────────────────────────────────────────────── */
.membox {
  background: linear-gradient(135deg, rgba(77,142,245,0.06), rgba(52,212,138,0.04));
  border: 1px solid rgba(77,142,245,0.2);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 22px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.membox:hover {
  border-color: rgba(77,142,245,0.35);
  box-shadow: 0 4px 20px rgba(77,142,245,0.06);
}
.membox-label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 8px;
}
.membox p { font-size: 13.5px; color: var(--text); }
.membox strong { color: var(--text-bright); }

/* ── BADGE ────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  margin-right: 4px;
  margin-bottom: 4px;
}
.bd-blue   { background: var(--blue-dim);   color: var(--blue);   border: 1px solid rgba(77,142,245,0.2); }
.bd-green  { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(52,212,138,0.2); }
.bd-amber  { background: var(--amber-dim);  color: var(--amber);  border: 1px solid rgba(245,166,35,0.2); }
.bd-red    { background: var(--red-dim);    color: var(--red);    border: 1px solid rgba(224,92,107,0.2); }
.bd-violet { background: var(--violet-dim); color: var(--violet); border: 1px solid rgba(167,139,250,0.2); }

.divider { height: 1px; background: var(--border); margin: 32px 0; }

/* ── TWO-PANE COMPARE ─────────────────────────────────────────── */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 22px; }
.compare .card { padding: 20px; }
.compare .card.bad-card  { border-color: rgba(224,92,107,0.25); }
.compare .card.good-card { border-color: rgba(52,212,138,0.25); }
.compare .bad-card:hover  { border-color: rgba(224,92,107,0.55); box-shadow: 0 8px 28px rgba(224,92,107,0.1); }
.compare .good-card:hover { border-color: rgba(52,212,138,0.55); box-shadow: 0 8px 28px rgba(52,212,138,0.1); }
.compare-label {
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 12px;
}
.compare-label.bad  { color: var(--red); }
.compare-label.good { color: var(--green); }

/* ── RESPONSIVE ───────────────────────────────────────────────── */
@media (max-width: 760px) {
  .header { padding: 28px 20px 24px; }
  .nav-bar { padding: 0 12px; }
  .main { padding: 24px 16px 60px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
}