/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ TOKENS */
:root {
  --ink:        #12141F;
  --ink-raised: #191C2C;
  --ink-hi:     #1E2236;
  --ink-border: #262C42;
  --paper:      #EFE9DE;
  --paper-up:   #F8F5EF;
  --paper-line: rgba(0,0,0,0.09);
  --gold:       #F0A832;
  --gold-bg:    rgba(240,168,50,0.08);
  --sage:       #4B9472;
  --sage-bg:    rgba(75,148,114,0.10);
  --violet:     #7B6BA8;
  --violet-bg:  rgba(123,107,168,0.10);
  --red:        #D45F5F;
  --blue:       #3A7BD5;
  --teal:       #48B4C8;
  --l-apps:     #D45F5F;
  --l-wm:       #F0A832;
  --l-disp:     #4B9472;
  --l-kern:     #3A7BD5;
  --l-hw:       #7B6BA8;
  --txt:        #E2DBD0;
  --txt-dim:    #7A7D9A;
  --dk:         #1A1D32;
  --dk-dim:     #5A5E7A;
  --fd: 'Space Grotesk', system-ui, sans-serif;
  --fb: 'Source Serif 4', Georgia, serif;
  --fm: 'JetBrains Mono', monospace;
  --r:  4px;
  --rl: 12px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ RESET */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--fb);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--txt);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
code { font-family: var(--fm); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 56px;
  background: rgba(19,22,43,.93);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--ink-border);
}
.nav__left { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }
.nav__back {
  font-family: var(--fm); font-size: .68rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  color: #79d7c5; white-space: nowrap;
  padding-right: 1rem; border-right: 1px solid var(--ink-border);
  transition: color .2s;
}
.nav__back:hover { color: #9fe6d8; }
.nav__logo {
  font-family: var(--fd); font-weight: 700; font-size: .9375rem;
  color: var(--gold); letter-spacing: .04em; flex-shrink: 0;
}
.nav__logo span { color: var(--txt-dim); font-weight: 300; }
.nav__links { display: flex; gap: 1.25rem; list-style: none; overflow: hidden; }
.nav__links a {
  font-family: var(--fd); font-size: .68rem; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--txt-dim); transition: color .2s; white-space: nowrap;
}
.nav__links a:hover, .nav__links a.active { color: var(--gold); }
@media (max-width: 768px) {
  .nav__links { display: none; }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SECTION SHELL */
.sec { padding: 6rem 2rem; }
.sec--dk  { background: var(--ink);   color: var(--txt); }
.sec--lt  { background: var(--paper); color: var(--dk); }
.inner { max-width: 1080px; margin: 0 auto; }

.eyebrow {
  font-family: var(--fd); font-size: .68rem; font-weight: 600;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .875rem;
}
.sec--lt .eyebrow { color: var(--sage); }

.sec-h {
  font-family: var(--fd);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 700; line-height: 1.12; margin-bottom: 1.25rem;
}

.divider { width: 40px; height: 2px; background: var(--gold); margin: 1.25rem 0 2.25rem; }
.sec--lt .divider { background: var(--sage); }

.prose {
  font-family: var(--fb); font-size: 1.0625rem;
  color: var(--txt-dim); max-width: 680px;
  line-height: 1.8; margin-bottom: 2.5rem;
}
.sec--lt .prose { color: var(--dk-dim); }
.prose strong { color: var(--txt); font-family: var(--fd); font-weight: 600; }
.sec--lt .prose strong { color: var(--dk); }

.callout {
  border-left: 3px solid var(--gold);
  padding: 1rem 1.25rem;
  background: var(--gold-bg);
  border-radius: 0 var(--r) var(--r) 0;
  margin-bottom: 2.5rem; max-width: 680px;
}
.callout p {
  font-family: var(--fb); font-style: italic;
  font-size: 1rem; color: var(--txt-dim); line-height: 1.7;
}
.callout p strong { font-style: normal; color: var(--txt); }
.sec--lt .callout { background: var(--sage-bg); border-color: var(--sage); }
.sec--lt .callout p { color: var(--dk-dim); }
.sec--lt .callout p strong { color: var(--dk); }
.callout-wide { max-width: 100%; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ REVEAL */
.rv { opacity: 0; transform: translateY(20px); transition: opacity .5s ease, transform .5s ease; }
.rv.on { opacity: 1; transform: none; }
.d1 { transition-delay: .10s; }
.d2 { transition-delay: .20s; }
.d3 { transition-delay: .30s; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ LESSON HERO */
.lesson-hero {
  padding: 7rem 2rem 4rem;
  border-bottom: 1px solid var(--ink-border);
}
.lesson-hero .inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
}
@media (max-width: 640px) { .lesson-hero .inner { grid-template-columns: 1fr; } }
.lesson-num {
  font-family: var(--fm); font-size: .75rem;
  color: var(--gold); letter-spacing: .1em;
  margin-bottom: .5rem;
}
.lesson-h {
  font-family: var(--fd);
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 700; line-height: 1.08;
  color: var(--txt);
}
.lesson-sub {
  font-family: var(--fb); font-size: 1.0625rem;
  color: var(--txt-dim); max-width: 560px;
  line-height: 1.7; margin-top: 1rem;
}
.lesson-meta {
  text-align: right;
  font-family: var(--fd); font-size: .7rem;
  color: var(--txt-dim); letter-spacing: .06em;
  line-height: 1.8;
}
@media (max-width: 640px) { .lesson-meta { text-align: left; } }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PAGE NAV */
.page-nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--ink-border);
  max-width: 1080px; margin: 0 auto;
  gap: 1rem;
}
.page-nav a {
  display: inline-flex; align-items: center; gap: .625rem;
  font-family: var(--fd); font-size: .8rem; font-weight: 600;
  letter-spacing: .04em; color: var(--txt-dim);
  padding: .625rem 1.125rem;
  border: 1px solid var(--ink-border);
  border-radius: var(--r);
  transition: border-color .2s, color .2s, background .2s;
}
.page-nav a:hover { border-color: var(--gold); color: var(--gold); background: var(--gold-bg); }
.page-nav a.next { background: var(--gold); color: var(--ink); border-color: var(--gold); }
.page-nav a.next:hover { background: #f8ba52; }
.page-nav a.prev::before { content: '←'; }
.page-nav a.next::after  { content: '→'; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ACCORDION */
.accord { border: 1px solid var(--ink-border); border-radius: var(--rl); overflow: hidden; }
.accord--lt { border-color: var(--paper-line); }

.arow { border-bottom: 1px solid var(--ink-border); cursor: pointer; overflow: hidden; }
.accord--lt .arow { border-bottom-color: var(--paper-line); }
.arow:last-child { border-bottom: none; }

.arow__hd {
  display: flex; align-items: center;
  padding: 1.125rem 1.5rem; gap: 1.125rem;
  transition: background .15s;
}
.arow:hover .arow__hd { background: rgba(255,255,255,.025); }
.arow.open .arow__hd { background: rgba(255,255,255,.04); }
.accord--lt .arow:hover .arow__hd { background: rgba(0,0,0,.025); }
.accord--lt .arow.open .arow__hd { background: rgba(0,0,0,.04); }

.arow__num {
  font-family: var(--fm); font-size: .62rem;
  color: var(--txt-dim); min-width: 20px;
}
.accord--lt .arow__num { color: var(--dk-dim); }
.arow__bar { width: 3px; height: 26px; border-radius: 2px; flex-shrink: 0; }
.arow__name {
  font-family: var(--fd); font-size: .9375rem;
  font-weight: 600; color: var(--txt); flex: 1;
}
.accord--lt .arow__name { color: var(--dk); }
.arow__tag {
  font-family: var(--fm); font-size: .62rem;
  padding: .16rem .5rem; border-radius: 3px;
  border: 1px solid var(--ink-border); color: var(--txt-dim);
}
.accord--lt .arow__tag { border-color: var(--paper-line); color: var(--dk-dim); }
.arow__chevron {
  font-size: .65rem; color: var(--txt-dim);
  transition: transform .3s; margin-left: .5rem;
}
.arow.open .arow__chevron { transform: rotate(180deg); }

.arow__body { max-height: 0; overflow: hidden; transition: max-height .4s ease; }

.arow__in {
  padding: 0 1.5rem 1.75rem 4.125rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
@media (max-width: 600px) { .arow__in { grid-template-columns: 1fr; padding-left: 1.5rem; } }
.arow__in p {
  font-family: var(--fb); font-size: .9375rem;
  color: var(--txt-dim); line-height: 1.7;
}
.accord--lt .arow__in p { color: var(--dk-dim); }
.arow__in p strong { color: var(--txt); font-family: var(--fd); font-weight: 600; }
.accord--lt .arow__in p strong { color: var(--dk); }

.arow__ex {
  padding: .875rem 1rem;
  background: var(--ink-raised);
  border-radius: var(--r); border-left: 3px solid;
}
.accord--lt .arow__ex { background: rgba(0,0,0,.04); }
.arow__ex h4 {
  font-family: var(--fd); font-size: .62rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--txt-dim); margin-bottom: .35rem;
}
.accord--lt .arow__ex h4 { color: var(--dk-dim); }
.arow__ex code {
  font-family: var(--fm); font-size: .78rem;
  color: var(--txt); line-height: 1.6; display: block;
}
.accord--lt .arow__ex code { color: var(--dk); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ GLOSSARY */
.gloss {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
  gap: 1.25rem;
}
.gc {
  background: var(--paper-up); border-radius: var(--rl);
  padding: 1.375rem 1.5rem;
  border: 1px solid rgba(0,0,0,.07);
  box-shadow: 0 2px 10px rgba(0,0,0,.06);
  transition: transform .2s, box-shadow .2s;
}
.gc:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.11); }
.gc__role {
  font-family: var(--fd); font-size: .62rem; font-weight: 600;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--sage); margin-bottom: .25rem;
}
.gc__term {
  font-family: var(--fd); font-size: 1.1875rem;
  font-weight: 700; color: var(--dk); margin-bottom: .55rem;
}
.gc__body {
  font-family: var(--fb); font-size: .9rem;
  color: var(--dk-dim); line-height: 1.65;
}
.gc__eg {
  display: inline-block; margin-top: .65rem;
  font-family: var(--fm); font-size: .68rem;
  color: var(--sage); background: var(--sage-bg);
  padding: .2rem .55rem; border-radius: 3px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ TABS */
.tabs-label {
  font-family: var(--fd); font-size: .65rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--txt-dim); margin-bottom: .625rem;
}
.sec--lt .tabs-label { color: var(--dk-dim); }
.tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 2rem; }
.tab {
  font-family: var(--fd); font-size: .8rem; font-weight: 600;
  letter-spacing: .03em; padding: .6rem 1.375rem;
  background: var(--ink-raised); border: 2px solid var(--ink-border);
  border-radius: var(--r); color: var(--txt-dim);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, transform .1s;
}
.tab:hover { background: var(--ink-hi); border-color: rgba(240,168,50,.4); color: var(--txt); transform: translateY(-1px); }
.tab.active { background: var(--gold); border-color: var(--gold); color: var(--ink); transform: none; }
.tabs--lt .tab { background: var(--paper-up); border-color: rgba(0,0,0,.15); color: var(--dk-dim); }
.tabs--lt .tab:hover { background: #fff; border-color: rgba(75,148,114,.5); color: var(--dk); transform: translateY(-1px); }
.tabs--lt .tab.active { background: var(--sage); border-color: var(--sage); color: #fff; transform: none; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PACKAGE CARDS */
.pkg-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.125rem; }
.pkg {
  background: var(--paper-up); border: 1px solid rgba(0,0,0,.07);
  border-radius: var(--rl); padding: 1.375rem;
  transition: transform .2s, box-shadow .2s;
}
.pkg:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.10); }
.pkg--dk { background: var(--ink-raised); border-color: var(--ink-border); }
.pkg--dk:hover { box-shadow: 0 6px 20px rgba(0,0,0,.35); }
.pkg__cmd {
  font-family: var(--fm); font-size: .68rem;
  color: var(--sage); background: var(--sage-bg);
  padding: .2rem .55rem; border-radius: 3px;
  display: inline-block; margin-bottom: .6rem;
}
.pkg--dk .pkg__cmd { color: var(--gold); background: var(--gold-bg); }
.pkg__name { font-family: var(--fd); font-size: 1.125rem; font-weight: 700; color: var(--dk); margin-bottom: .5rem; }
.pkg--dk .pkg__name { color: var(--txt); }
.pkg__body { font-family: var(--fb); font-size: .875rem; color: var(--dk-dim); line-height: 1.65; margin-bottom: .875rem; }
.pkg--dk .pkg__body { color: var(--txt-dim); }
.pkg__traits { display: flex; flex-wrap: wrap; gap: .3rem; }
.trait { font-family: var(--fm); font-size: .62rem; padding: .18rem .5rem; border-radius: 3px; }
.tr-g { background: rgba(75,148,114,.1);  color: var(--sage);   border: 1px solid rgba(75,148,114,.3); }
.tr-b { background: rgba(58,123,213,.1);  color: var(--blue);   border: 1px solid rgba(58,123,213,.3); }
.tr-m { background: rgba(0,0,0,.05);      color: var(--dk-dim); border: 1px solid rgba(0,0,0,.1); }
.tr-r { background: rgba(212,95,95,.1);   color: var(--red);    border: 1px solid rgba(212,95,95,.3); }
.tr-v { background: rgba(123,107,168,.1); color: var(--violet); border: 1px solid rgba(123,107,168,.3); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ COMMAND REFERENCE */
.cmd-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.125rem; }
.cmd-card {
  background: var(--ink-raised); border: 1px solid var(--ink-border);
  border-radius: var(--rl); padding: 1.25rem; overflow: hidden;
}
.cmd-card__name {
  font-family: var(--fm); font-size: 1.0625rem; font-weight: 500;
  color: var(--gold); margin-bottom: .375rem;
}
.cmd-card__desc {
  font-family: var(--fb); font-size: .875rem;
  color: var(--txt-dim); line-height: 1.6; margin-bottom: .875rem;
}
.cmd-card__ex {
  background: var(--ink); border-radius: var(--r);
  padding: .75rem .875rem;
}
.cmd-card__ex code {
  font-family: var(--fm); font-size: .75rem;
  color: var(--txt); line-height: 1.7; display: block;
}
.cmd-card__ex .comment { color: var(--txt-dim); }
.cmd-warn {
  margin-top: .625rem; padding: .4rem .75rem;
  background: rgba(212,95,95,.1); border-radius: var(--r);
  border-left: 2px solid var(--red);
  font-family: var(--fd); font-size: .72rem;
  color: var(--red); font-weight: 600;
}

/* permission block */
.perm-block {
  background: var(--ink-raised); border: 1px solid var(--ink-border);
  border-radius: var(--rl); padding: 1.5rem; font-family: var(--fm);
  margin: 1.5rem 0;
}
.perm-block code { font-size: .82rem; color: var(--txt); line-height: 2; display: block; }
.perm-block .hl-r { color: var(--gold); }
.perm-block .hl-w { color: var(--red); }
.perm-block .hl-x { color: var(--sage); }
.perm-block .hl-d { color: var(--violet); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ DISTRO TABLE */
.t-wrap {
  overflow-x: auto; border-radius: var(--rl);
  border: 1px solid var(--ink-border); margin-bottom: 2rem;
}
.dtable { width: 100%; border-collapse: collapse; font-family: var(--fd); font-size: .8rem; }
.dtable th {
  padding: .875rem 1rem; text-align: left;
  background: var(--ink-raised); color: var(--txt-dim);
  font-weight: 600; font-size: .67rem; letter-spacing: .09em;
  text-transform: uppercase; border-bottom: 1px solid var(--ink-border);
  white-space: nowrap; cursor: pointer; user-select: none;
  transition: background .15s, color .15s;
}
.dtable th:first-child { cursor: default; }
.dtable th:not(:first-child):hover { background: var(--ink-hi); color: var(--txt); }
.dtable th.col-lit { background: rgba(75,148,114,.15); color: var(--sage); }
.dtable td {
  padding: .75rem 1rem; border-bottom: 1px solid var(--ink-border);
  color: var(--txt); vertical-align: top; transition: background .15s;
}
.dtable tr:last-child td { border-bottom: none; }
.dtable td.col-lit { background: rgba(75,148,114,.06); }
.dtable td:first-child { font-weight: 600; font-size: .8rem; }
.dots { display: flex; gap: 3px; margin-bottom: .3rem; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-border); }
.dot.g { background: var(--gold); }
.dot.s { background: var(--sage); }
.hint { font-family: var(--fm); font-size: .62rem; color: var(--txt-dim); display: block; }
.col-lit .hint { color: var(--sage); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ QUIZ */
.quiz {
  max-width: 640px; border: 1px solid var(--ink-border);
  border-radius: var(--rl); overflow: hidden; background: var(--ink-raised);
}
.qstep { display: none; padding: 2rem; }
.qstep.on { display: block; }
.qstep__q {
  font-family: var(--fd); font-size: 1.0625rem; font-weight: 600;
  color: var(--txt); margin-bottom: 1.375rem; line-height: 1.4;
}
.qopts { display: flex; flex-direction: column; gap: .625rem; }
.qopt {
  display: flex; align-items: flex-start; gap: .875rem;
  padding: .8rem 1rem; border: 1px solid var(--ink-border);
  border-radius: var(--r); cursor: pointer;
  transition: border-color .15s, background .15s;
}
.qopt:hover { border-color: var(--gold); background: var(--gold-bg); }
.qopt.sel  { border-color: var(--gold); background: var(--gold-bg); }
.qopt input { display: none; }
.qopt__circle {
  width: 16px; height: 16px; border-radius: 50%;
  border: 1px solid var(--ink-border); flex-shrink: 0;
  margin-top: .18rem; display: flex; align-items: center; justify-content: center;
  transition: border-color .15s;
}
.qopt.sel .qopt__circle { border-color: var(--gold); background: var(--gold); }
.qopt.sel .qopt__circle::after {
  content: ''; display: block; width: 6px; height: 6px;
  border-radius: 50%; background: var(--ink);
}
.qopt span { font-family: var(--fb); font-size: .9375rem; color: var(--txt-dim); line-height: 1.5; }
.qopt.sel span { color: var(--txt); }
.qfooter {
  border-top: 1px solid var(--ink-border);
  padding: 1rem 2rem; display: flex; flex-direction: column; gap: .75rem;
}
.qprog { height: 2px; background: var(--ink-border); border-radius: 1px; }
.qbar { height: 100%; background: var(--gold); border-radius: 1px; width: 0%; transition: width .35s ease; }
.qnav { display: flex; align-items: center; justify-content: space-between; }
.qcount { font-family: var(--fd); font-size: .7rem; color: var(--txt-dim); letter-spacing: .06em; }
.qbtn {
  font-family: var(--fd); font-size: .8rem; font-weight: 600;
  letter-spacing: .04em; color: var(--ink); background: var(--gold);
  border: none; padding: .5rem 1.125rem; border-radius: var(--r);
  cursor: pointer; transition: background .2s, opacity .2s;
}
.qbtn:disabled { opacity: .35; cursor: not-allowed; }
.qbtn:not(:disabled):hover { background: #f8ba52; }
.qresult { text-align: left; }
.qresult__badge {
  font-family: var(--fd); font-size: .67rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .5rem;
}
.qresult__name { font-family: var(--fd); font-size: 2rem; font-weight: 700; color: var(--txt); margin-bottom: .25rem; line-height: 1.1; }
.qresult__plus { font-family: var(--fd); font-size: .9375rem; font-weight: 500; color: var(--gold); margin-bottom: .875rem; }
.qresult__line { font-family: var(--fb); font-style: italic; color: var(--txt-dim); margin-bottom: 1.25rem; font-size: .9375rem; }
.qresult__why { font-family: var(--fb); font-size: .9375rem; color: var(--txt-dim); line-height: 1.7; margin-bottom: 1.25rem; }
.qresult__cta {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--fd); font-size: .8rem; font-weight: 600;
  color: var(--gold); letter-spacing: .04em;
  border: 1px solid var(--gold); padding: .5rem 1.125rem;
  border-radius: var(--r); transition: background .2s, color .2s;
}
.qresult__cta:hover { background: var(--gold); color: var(--ink); }
.qresult__restart {
  display: inline-flex; align-items: center; gap: .35rem;
  font-family: var(--fd); font-size: .75rem; color: var(--txt-dim);
  margin-left: 1rem; cursor: pointer; border: none; background: none;
  transition: color .2s;
}
.qresult__restart:hover { color: var(--txt); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ DESKTOP CARDS */
.dcards { display: grid; grid-template-columns: repeat(auto-fill, minmax(245px, 1fr)); gap: 1.125rem; }
.dcard {
  background: var(--paper-up); border: 1px solid rgba(0,0,0,.07);
  border-radius: var(--rl); padding: 1.375rem;
  transition: transform .2s, box-shadow .2s;
}
.dcard:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.11); }
.dcard--rec { border-color: rgba(75,148,114,.4); }
.dcard__type {
  font-family: var(--fd); font-size: .62rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--dk-dim); margin-bottom: .25rem;
}
.dcard--rec .dcard__type { color: var(--sage); }
.dcard__name { font-family: var(--fd); font-size: 1.125rem; font-weight: 700; color: var(--dk); margin-bottom: .55rem; }
.dcard__body { font-family: var(--fb); font-size: .875rem; color: var(--dk-dim); line-height: 1.65; margin-bottom: .875rem; }
.tags { display: flex; flex-wrap: wrap; gap: .3rem; }
.tag {
  font-family: var(--fm); font-size: .62rem; padding: .18rem .5rem;
  border-radius: 3px; background: rgba(0,0,0,.05);
  border: 1px solid rgba(0,0,0,.09); color: var(--dk-dim);
}
.tw { border-color: rgba(75,148,114,.3);  color: var(--sage);   background: var(--sage-bg); }
.tt { border-color: rgba(123,107,168,.3); color: var(--violet); background: var(--violet-bg); }
.tr { border-color: rgba(240,168,50,.3);  color: var(--gold);   background: var(--gold-bg); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ VERDICT CARDS */
.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; margin-top: 2.5rem; }
.pcard {
  border: 1px solid var(--ink-border); border-radius: var(--rl);
  padding: 2rem; background: var(--ink-raised);
  transition: border-color .25s;
}
.pcard:hover { border-color: var(--gold); }
.pcard__label {
  font-family: var(--fd); font-size: .67rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .75rem;
}
.pcard__combo { font-family: var(--fd); font-size: 1.875rem; font-weight: 700; color: var(--txt); line-height: 1.15; margin-bottom: .25rem; }
.pcard__plus { font-family: var(--fd); font-size: .9375rem; font-weight: 500; color: var(--gold); margin-bottom: .875rem; }
.pcard__line { font-family: var(--fb); font-style: italic; color: var(--txt-dim); margin-bottom: 1.5rem; font-size: .9375rem; }
.pcard__list { list-style: none; display: flex; flex-direction: column; gap: .75rem; }
.pcard__list li { display: flex; gap: .625rem; font-family: var(--fb); font-size: .9rem; color: var(--txt-dim); line-height: 1.6; }
.pcard__list li::before { content: '→'; color: var(--gold); flex-shrink: 0; margin-top: .1em; font-family: var(--fd); }
.pcard__list code { font-family: var(--fm); font-size: .82rem; color: var(--gold); }
.pcard__for {
  margin-top: 1.5rem; padding: .875rem 1rem;
  background: var(--gold-bg); border-left: 3px solid var(--gold);
  border-radius: 0 var(--r) var(--r) 0;
}
.pcard__for strong {
  display: block; font-family: var(--fd); font-size: .63rem;
  font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--gold); margin-bottom: .25rem;
}
.pcard__for p { font-family: var(--fb); font-size: .875rem; color: var(--txt-dim); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ LANDING PAGE */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem; margin-top: 3rem;
}
.course-card {
  background: var(--ink-raised); border: 1px solid var(--ink-border);
  border-radius: var(--rl); padding: 1.75rem;
  display: flex; flex-direction: column;
  transition: border-color .2s, transform .2s;
  text-decoration: none;
}
.course-card:hover { border-color: var(--gold); transform: translateY(-2px); }
.course-card__num {
  font-family: var(--fm); font-size: .68rem;
  color: var(--gold); letter-spacing: .08em; margin-bottom: .625rem;
}
.course-card__title {
  font-family: var(--fd); font-size: 1.25rem; font-weight: 700;
  color: var(--txt); margin-bottom: .625rem; line-height: 1.25;
}
.course-card__desc {
  font-family: var(--fb); font-size: .875rem;
  color: var(--txt-dim); line-height: 1.65; flex: 1;
  margin-bottom: 1.25rem;
}
.course-card__cta {
  font-family: var(--fd); font-size: .75rem; font-weight: 600;
  color: var(--gold); letter-spacing: .04em;
  display: flex; align-items: center; gap: .375rem;
}
.course-card--new .course-card__num { color: var(--sage); }
.course-card--new { border-color: rgba(75,148,114,.3); }
.course-card--new:hover { border-color: var(--sage); }
.course-card--new .course-card__cta { color: var(--sage); }

/* hero bg grid */
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 65% 45%, rgba(240,168,50,.07) 0%, transparent 55%),
    radial-gradient(ellipse at 15% 80%, rgba(75,148,114,.06) 0%, transparent 50%),
    repeating-linear-gradient(0deg, transparent, transparent 79px, rgba(39,45,85,.3) 79px, rgba(39,45,85,.3) 80px),
    repeating-linear-gradient(90deg, transparent, transparent 79px, rgba(39,45,85,.18) 79px, rgba(39,45,85,.18) 80px);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BUTTON */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--fd); font-size: .875rem; font-weight: 600;
  letter-spacing: .04em; color: var(--ink);
  background: var(--gold); padding: .75rem 1.5rem;
  border-radius: var(--r); border: none; cursor: pointer;
  transition: background .2s, transform .2s;
}
.btn:hover { background: #f8ba52; transform: translateY(-1px); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FOOTER */
.footer {
  padding: 2.5rem 2rem; text-align: center;
  border-top: 1px solid var(--ink-border);
  font-family: var(--fd); font-size: .75rem; color: var(--txt-dim);
}
.footer a { color: var(--gold); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ CODE BLOCK */
.code-block {
  position: relative;
  background: var(--ink); border: 1px solid var(--ink-border);
  border-radius: var(--r); padding: .875rem 1rem;
  font-family: var(--fm); font-size: .78rem;
  color: var(--txt); line-height: 1.8;
  overflow-x: auto; margin: .875rem 0;
}
.code-block .cm  { color: var(--txt-dim); }
.code-block .hl  { color: var(--gold); }
.code-block .ok  { color: var(--sage); }
.code-block .no  { color: var(--red); }

/* copy button — injected by script.js */
.cb-btn {
  position: absolute; top: .5rem; right: .5rem;
  font-family: var(--fd); font-size: .62rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--txt-dim); background: var(--ink-raised);
  border: 1px solid var(--ink-border); border-radius: 3px;
  padding: .2rem .55rem; cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  line-height: 1.6; user-select: none;
}
.cb-btn:hover { color: var(--txt); border-color: rgba(240,168,50,.4); background: var(--ink-hi); }
.cb-btn.copied { color: var(--sage); border-color: rgba(75,148,114,.5); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FILE BLOCK */
.file-block {
  border: 1px solid var(--ink-border);
  border-radius: var(--r); overflow: hidden;
}
.file-block__path {
  font-family: var(--fm); font-size: .7rem; font-weight: 500;
  color: var(--txt-dim); background: var(--ink-raised);
  border-bottom: 1px solid var(--ink-border);
  padding: .45rem .875rem;
  letter-spacing: .02em;
}
.file-block__body {
  background: var(--ink); padding: .875rem 1rem;
  font-family: var(--fm); font-size: .78rem;
  color: var(--txt); line-height: 1.8;
}
.file-block__body .cm  { color: var(--txt-dim); }
.file-block__body .key { color: var(--gold); }
.file-block__body .val { color: var(--sage); }
.file-block__body .no  { color: var(--red); }
.file-block { margin: 1.25rem 0; }

/* light-background variant (used in sec--lt sections) */
.file-block--lt { background: var(--paper-up); border-color: rgba(0,0,0,.1); }
.file-block--lt .file-block__path { background: #e8e2d8; border-color: rgba(0,0,0,.1); color: var(--dk-dim); }
.file-block--lt .file-block__body { background: var(--paper-up); color: var(--dk); }
.file-block--lt .file-block__body .cm  { color: var(--dk-dim); }
.file-block--lt .file-block__body .key { color: #b07a10; }
.file-block--lt .file-block__body .val { color: #2e7a55; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ KBD */
kbd {
  font-family: var(--fm); font-size: .75em;
  background: var(--ink-raised); color: var(--txt);
  border: 1px solid var(--ink-border);
  border-bottom: 2px solid rgba(255,255,255,.15);
  border-radius: 3px; padding: .1em .45em;
  white-space: nowrap; display: inline-block; line-height: 1.4;
}
.sec--lt kbd {
  background: var(--paper-up); color: var(--dk);
  border-color: rgba(0,0,0,.2);
  border-bottom-color: rgba(0,0,0,.3);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ LESSON PROGRESS TRAIL */
.lesson-trail {
  display: flex; align-items: center; gap: 6px;
  margin: .625rem 0 .875rem;
}
.lt-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ink-border); flex-shrink: 0;
  transition: background .2s;
}
.lt-dot.done { background: rgba(240,168,50,.5); }
.lt-dot.cur  { background: var(--gold); box-shadow: 0 0 0 3px rgba(240,168,50,.25); }
.lt-label {
  font-family: var(--fm); font-size: .62rem;
  color: var(--txt-dim); letter-spacing: .08em;
  margin-left: .25rem;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ LESSON HERO TINTS */
.lesson-hero { position: relative; overflow: hidden; }
.lesson-hero::after {
  content: ''; position: absolute; top: -30%; right: -15%;
  width: 60%; height: 200%; border-radius: 50%;
  pointer-events: none; z-index: 0;
}
.lesson-hero .inner { position: relative; z-index: 1; }
header.lesson-hero[data-lesson="1"]::after { background: radial-gradient(ellipse, rgba(58,123,213,.08) 0%, transparent 70%); }
header.lesson-hero[data-lesson="2"]::after { background: radial-gradient(ellipse, rgba(75,148,114,.08) 0%, transparent 70%); }
header.lesson-hero[data-lesson="3"]::after { background: radial-gradient(ellipse, rgba(240,168,50,.07) 0%, transparent 70%); }
header.lesson-hero[data-lesson="4"]::after { background: radial-gradient(ellipse, rgba(75,148,114,.09) 0%, transparent 70%); }
header.lesson-hero[data-lesson="5"]::after { background: radial-gradient(ellipse, rgba(123,107,168,.09) 0%, transparent 70%); }
header.lesson-hero[data-lesson="6"]::after { background: radial-gradient(ellipse, rgba(72,180,200,.08) 0%, transparent 70%); }
header.lesson-hero[data-lesson="7"]::after { background: radial-gradient(ellipse, rgba(240,168,50,.10) 0%, transparent 70%); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FAKE TERMINAL */
.fterm {
  background: var(--ink); border: 1px solid var(--ink-border);
  border-radius: var(--rl); overflow: hidden;
  margin: 2rem 0; max-width: 720px;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
}
.fterm__bar {
  background: var(--ink-raised); border-bottom: 1px solid var(--ink-border);
  padding: .625rem 1rem; display: flex; align-items: center; gap: .5rem;
}
.fterm__dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
.fterm__title { font-family: var(--fm); font-size: .72rem; color: var(--txt-dim); margin-left: .375rem; }
.fterm__body {
  padding: 1rem 1.25rem; font-family: var(--fm); font-size: .82rem;
  line-height: 2; min-height: 130px;
}
.fterm__line--old { color: var(--txt-dim); }
.fterm__line--out { color: var(--txt-dim); font-size: .78rem; line-height: 1.6; }
.fterm__ps  { color: var(--sage); }
.fterm__cur {
  display: inline-block; width: .55em; background: var(--gold);
  color: transparent; animation: cur-blink 1.1s step-end infinite;
  margin-left: 1px; border-radius: 1px;
}
.fterm__cur.typing { animation: none; background: var(--txt); }
.fterm__out {
  color: var(--txt-dim); white-space: pre; font-size: .78rem;
  line-height: 1.65; margin-top: .25rem;
  max-height: 160px; overflow-y: auto;
}
.fterm__hint {
  font-family: var(--fd); font-size: .68rem; color: var(--txt-dim);
  padding: .5rem 1.25rem .625rem; border-top: 1px solid var(--ink-border);
  letter-spacing: .04em;
}
@keyframes cur-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* cmd-card clickable state (terminal demo) */
.cmd-card--clickable { cursor: pointer; }
.cmd-card--clickable:hover { border-color: rgba(75,148,114,.5); transform: translateY(-2px); }
.cmd-card--clickable .cmd-card__name::after {
  content: ' ▶';
  font-size: .6em; color: var(--sage);
  opacity: 0; transition: opacity .15s;
}
.cmd-card--clickable:hover .cmd-card__name::after { opacity: 1; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ CMD SEARCH */
.cmd-search-wrap { margin: 1.5rem 0 1rem; max-width: 360px; position: relative; }
.cmd-search {
  width: 100%; font-family: var(--fd); font-size: .875rem;
  background: var(--ink-raised); color: var(--txt);
  border: 1px solid var(--ink-border); border-radius: var(--r);
  padding: .6rem .875rem .6rem 2.25rem; outline: none;
  transition: border-color .2s;
}
.cmd-search:focus { border-color: rgba(240,168,50,.5); }
.cmd-search::placeholder { color: var(--txt-dim); }
.cmd-search-wrap::before {
  content: '⌕'; position: absolute; left: .7rem; top: 50%;
  transform: translateY(-50%); color: var(--txt-dim);
  font-size: 1.1rem; pointer-events: none;
}
.cmd-none { display: none; font-family: var(--fb); font-size: .9rem; color: var(--txt-dim); padding: .5rem 0; }
.cmd-none.visible { display: block; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BUTTON ACCORDION (single-item variant) */
button.arow__hd {
  width: 100%; background: none; border: none; cursor: pointer;
  text-align: left; justify-content: space-between;
}
.arow__bd { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.arow__ic {
  font-size: 1rem; font-weight: 300; color: var(--txt-dim);
  margin-left: auto; flex-shrink: 0;
  transition: transform .3s ease; display: inline-block;
}
.accord.open .arow__ic { transform: rotate(45deg); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ACCORDION EXPAND CONTROLS */
.accord-controls {
  display: flex; gap: .5rem; margin-bottom: .875rem;
}
.accord-ctrl {
  font-family: var(--fd); font-size: .68rem; font-weight: 600;
  letter-spacing: .07em; text-transform: uppercase;
  color: var(--txt-dim); background: none;
  border: 1px solid var(--ink-border); border-radius: 3px;
  padding: .25rem .7rem; cursor: pointer;
  transition: color .15s, border-color .15s;
}
.accord-ctrl:hover { color: var(--gold); border-color: rgba(240,168,50,.4); }
.sec--lt .accord-ctrl { color: var(--dk-dim); border-color: var(--paper-line); }
.sec--lt .accord-ctrl:hover { color: var(--sage); border-color: rgba(75,148,114,.4); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ NAV APPENDICES LINK */
.nav__appendix {
  font-family: var(--fd); font-size: .68rem; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--violet) !important;
  border-left: 1px solid var(--ink-border); padding-left: 1.25rem;
  white-space: nowrap;
}
.nav__appendix:hover { color: var(--violet) !important; opacity: .8; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ QUIZ RESULT ENHANCE */
.qresult {
  animation: result-in .35s ease forwards;
}
@keyframes result-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
.quiz[data-result="debian"]  { border-color: rgba(75,148,114,.5); }
.quiz[data-result="arch"]    { border-color: rgba(72,180,200,.5); }
.quiz[data-result="ubuntu"]  { border-color: rgba(240,168,50,.5); }
.quiz[data-result="fedora"]  { border-color: rgba(58,123,213,.5); }
.quiz[data-result="perf"]    { border-color: rgba(123,107,168,.5); }
.quiz[data-result="minimal"] { border-color: rgba(123,107,168,.5); }
.qresult__cta--primary {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--fd); font-size: .875rem; font-weight: 700;
  color: var(--ink); background: var(--gold); letter-spacing: .04em;
  border: none; padding: .75rem 1.5rem;
  border-radius: var(--r); transition: background .2s, transform .15s;
  cursor: pointer; margin-top: .5rem;
}
.qresult__cta--primary:hover { background: #f8ba52; transform: translateY(-1px); }
.qresult__actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: .25rem; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .arow__body, .arow__chevron { transition: none; }
  .tab, .cb-btn, .gc, .pkg, .course-card, .appendix-card { transition: none; }
  .fterm__cur { animation: none; }
  .qresult { animation: none; }
}

.footer a:hover { text-decoration: underline; }