/* ============================================================
   CORSO VIM — Foglio di stile condiviso
   Tipografia: JetBrains Mono (utility/codice) + Newsreader (testo)
   Palette: dark editoriale, accento ambra, verde "vim" per i modi
   Stessa famiglia visiva dei corsi Taskwarrior e grep.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700;800&family=Newsreader:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&display=swap');

:root{
  --bg:#0d0d0c;
  --bg-elev:#161513;
  --bg-card:#1a1917;
  --bg-term:#0a0907;
  --line:#2a2824;
  --line-soft:#1f1d1a;
  --ink:#ece6d4;
  --ink-dim:#9a9384;
  --ink-faint:#5e584d;
  --amber:#ffb000;
  --amber-soft:#3a2a00;
  --green:#7bbf5a;
  --green-soft:#1c2a16;
  --red:#e25c4a;
  --magenta:#d97aac;
  --cyan:#5fb3b3;
  --blue:#6c8fd6;
  --mono:'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --serif:'Newsreader', Georgia, 'Times New Roman', serif;
  --r-sm:4px;
  --r-md:8px;
  --wrap:820px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.65;
  font-feature-settings:"liga","kern";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  min-height:100vh;
  padding-bottom:0;
}

/* Grana sottilissima su tutto lo schermo */
body::before{
  content:"";
  position:fixed;inset:0;
  pointer-events:none;
  opacity:.03;
  z-index:100;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

a{color:var(--amber);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s,color .2s}
a:hover{border-bottom-color:var(--amber)}

::selection{background:var(--amber-soft);color:var(--amber)}

/* ======================= TOPBAR ======================= */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;
  padding:12px 24px;
  background:rgba(13,13,12,.9);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  font-family:var(--mono);
  font-size:13px;
}
.topbar .brand{color:var(--ink-dim);letter-spacing:.02em;white-space:nowrap}
.topbar .brand .dollar{color:var(--green);font-weight:700}
.topbar nav{display:flex;gap:18px;flex-wrap:wrap;justify-content:flex-end}
.topbar nav a{color:var(--ink-faint)}
.topbar nav a:hover{color:var(--amber)}

/* ======================= HERO (indice) ======================= */
.hero{
  max-width:var(--wrap);
  margin:0 auto;
  padding:88px 24px 56px;
  border-bottom:1px solid var(--line);
}
.hero .eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin-bottom:26px;
}
.hero h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(40px,7vw,72px);
  line-height:1.05;
  letter-spacing:-.02em;
  margin-bottom:22px;
}
.hero h1 em{font-style:italic;color:var(--amber)}
.hero .sub{
  font-size:20px;
  color:var(--ink-dim);
  max-width:60ch;
}
.hero .sub code{color:var(--ink)}

.hero-meta{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:1px;
  margin-top:44px;
  background:var(--line);
  border:1px solid var(--line);
}
.hero-meta div{
  background:var(--bg);
  padding:14px 16px;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
}
.hero-meta div span{
  display:block;
  margin-top:7px;
  font-size:13px;
  letter-spacing:0;
  text-transform:none;
  color:var(--ink);
}

/* ======================= INDICE LEZIONI ======================= */
.lessons{
  max-width:var(--wrap);
  margin:0 auto;
  padding:56px 24px 80px;
}
.lessons-title{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin-bottom:26px;
}
.lesson-card{border-top:1px solid var(--line)}
.lesson-card:last-child{border-bottom:1px solid var(--line)}
.lesson-card a{
  display:grid;
  grid-template-columns:64px 1fr 34px;
  align-items:baseline;
  gap:14px;
  padding:22px 8px;
  border:0;
  color:inherit;
  transition:background .2s,padding .2s;
}
.lesson-card a:hover{background:var(--bg-elev);padding-left:16px}
.lesson-card .num{
  font-family:var(--mono);
  font-size:15px;
  font-weight:700;
  color:var(--ink-faint);
  letter-spacing:.05em;
}
.lesson-card a:hover .num{color:var(--amber)}
.lesson-card h3{
  font-family:var(--serif);
  font-weight:600;
  font-size:23px;
  line-height:1.25;
  letter-spacing:-.01em;
  margin-bottom:6px;
}
.lesson-card p{font-size:16px;color:var(--ink-dim);max-width:60ch}
.lesson-card .arrow{
  font-family:var(--mono);
  color:var(--ink-faint);
  text-align:right;
  transition:transform .2s,color .2s;
}
.lesson-card a:hover .arrow{color:var(--amber);transform:translateX(4px)}

/* ======================= PAGINA LEZIONE ======================= */
.lesson-wrap{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 24px 40px;
}
.lesson-head{
  padding:64px 0 40px;
  border-bottom:1px solid var(--line);
  margin-bottom:44px;
}
.lesson-head .crumb{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin-bottom:20px;
}
.lesson-head h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(32px,5.4vw,50px);
  line-height:1.1;
  letter-spacing:-.02em;
  margin-bottom:20px;
}
.lesson-head .lead{font-size:19px;color:var(--ink-dim)}
.lesson-head .lead code{color:var(--ink)}

/* ---------- Blocchi teoria / pratica / trucco ---------- */
.block{margin-bottom:52px}
.block-label{
  display:inline-block;
  font-family:var(--mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  padding:4px 10px;
  border:1px solid;
  border-radius:var(--r-sm);
  margin-bottom:18px;
}
.block-label.teoria{color:var(--cyan);border-color:rgba(95,179,179,.35);background:rgba(95,179,179,.07)}
.block-label.pratica{color:var(--green);border-color:rgba(123,191,90,.35);background:rgba(123,191,90,.07)}
.block-label.trucco{color:var(--amber);border-color:rgba(255,176,0,.35);background:rgba(255,176,0,.07)}

.block h2{
  font-family:var(--serif);
  font-weight:600;
  font-size:29px;
  line-height:1.2;
  letter-spacing:-.01em;
  margin:0 0 18px;
}
.block h3{
  font-family:var(--mono);
  font-weight:700;
  font-size:15px;
  letter-spacing:.02em;
  color:var(--ink);
  margin:32px 0 12px;
}
.block p{margin-bottom:18px;max-width:66ch}
.block p:last-child{margin-bottom:0}
.block ul,.block ol{margin:0 0 20px 22px;max-width:64ch}
.block li{margin-bottom:9px}
.block li::marker{color:var(--ink-faint)}
.block em{color:var(--ink);font-style:italic}
.block strong{color:var(--ink);font-weight:600}

code{
  font-family:var(--mono);
  font-size:.86em;
  background:var(--bg-elev);
  border:1px solid var(--line-soft);
  border-radius:var(--r-sm);
  padding:1px 5px;
  color:var(--amber);
  white-space:nowrap;
}

/* ---------- Tasti ---------- */
kbd{
  font-family:var(--mono);
  font-size:.8em;
  font-weight:700;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-bottom-width:2px;
  border-radius:var(--r-sm);
  padding:2px 7px;
  color:var(--ink);
  white-space:nowrap;
}

/* ---------- Terminale ---------- */
.terminal{
  background:var(--bg-term);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  margin:24px 0 28px;
  overflow:hidden;
}
.terminal-head{
  display:flex;align-items:center;gap:8px;
  padding:9px 14px;
  background:var(--bg-elev);
  border-bottom:1px solid var(--line);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-faint);
}
.terminal-head::before{
  content:"";
  width:8px;height:8px;border-radius:50%;
  background:var(--green);
  opacity:.55;
  flex:none;
}
.terminal-body{padding:16px 18px;overflow-x:auto}
.terminal pre{
  font-family:var(--mono);
  font-size:13.5px;
  line-height:1.75;
  color:var(--ink);
  white-space:pre;
}
.terminal .prompt{color:var(--green);font-weight:700}
.terminal .colon{color:var(--amber);font-weight:700}
.terminal .comment{color:var(--ink-faint);font-style:italic}
.terminal .out{color:var(--ink-dim)}
.terminal .hl{color:var(--amber);font-weight:700}
.terminal .del{color:var(--red)}
.terminal .add{color:var(--green)}
.terminal .cur{background:var(--ink);color:var(--bg-term)}

/* ---------- Callout ---------- */
.callout{
  border-left:2px solid var(--amber);
  background:linear-gradient(90deg,rgba(255,176,0,.05),transparent 70%);
  padding:16px 20px;
  margin:24px 0;
  font-size:17px;
  color:var(--ink-dim);
  max-width:66ch;
}
.callout strong{color:var(--amber)}
.callout.warn{border-left-color:var(--red);background:linear-gradient(90deg,rgba(226,92,74,.06),transparent 70%)}
.callout.warn strong{color:var(--red)}

/* ---------- Tabella tasti ---------- */
table.keys{
  width:100%;
  border-collapse:collapse;
  margin:24px 0 28px;
  font-size:15px;
}
table.keys th{
  text-align:left;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
  font-weight:500;
  padding:0 14px 10px 0;
  border-bottom:1px solid var(--line);
}
table.keys td{
  padding:10px 14px 10px 0;
  border-bottom:1px solid var(--line-soft);
  vertical-align:top;
  color:var(--ink-dim);
}
table.keys td:first-child{
  font-family:var(--mono);
  font-size:13.5px;
  color:var(--amber);
  white-space:nowrap;
  width:1%;
  font-weight:500;
}
table.keys tr:hover td{background:var(--bg-elev)}

/* ---------- Modeline / statusline: elemento firma ---------- */
.modeline{
  display:flex;
  align-items:stretch;
  font-family:var(--mono);
  font-size:12px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  overflow:hidden;
  margin:22px 0 26px;
  background:var(--bg-elev);
}
.modeline .mode{
  padding:7px 14px;
  font-weight:800;
  letter-spacing:.14em;
  color:#0d0d0c;
  background:var(--green);
  white-space:nowrap;
}
.modeline .mode.insert{background:var(--amber)}
.modeline .mode.visual{background:var(--magenta)}
.modeline .mode.cmd{background:var(--cyan)}
.modeline .msg{
  padding:7px 14px;
  color:var(--ink-dim);
  flex:1;
  min-width:0;
}
.modeline .pos{
  padding:7px 14px;
  color:var(--ink-faint);
  border-left:1px solid var(--line);
  white-space:nowrap;
}

/* ---------- Navigazione fra lezioni ---------- */
.lesson-nav{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1px;
  margin-top:64px;
  background:var(--line);
  border:1px solid var(--line);
}
.lesson-nav a{
  background:var(--bg);
  padding:20px;
  border:0;
  color:var(--ink);
  transition:background .2s;
}
.lesson-nav a:hover{background:var(--bg-elev)}
.lesson-nav a.next{text-align:right}
.lesson-nav .label{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin-bottom:8px;
}
.lesson-nav a:hover .label{color:var(--amber)}
.lesson-nav .title{font-size:17px;line-height:1.3;color:var(--ink-dim)}
.lesson-nav span.empty{background:var(--bg);padding:20px}

/* ---------- Footer ---------- */
.footer{
  border-top:1px solid var(--line);
  padding:22px 24px;
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-family:var(--mono);
  font-size:12px;
  color:var(--ink-faint);
}
.footer a{color:var(--ink-faint)}
.footer a:hover{color:var(--amber)}

/* ======================= RESPONSIVE ======================= */
@media (max-width:640px){
  body{font-size:17px}
  .hero{padding:56px 20px 40px}
  .lessons{padding:40px 20px 60px}
  .lesson-wrap{padding:0 20px 32px}
  .lesson-head{padding:44px 0 30px}
  .lesson-card a{grid-template-columns:44px 1fr;gap:10px;padding:18px 4px}
  .lesson-card .arrow{display:none}
  .lesson-nav{grid-template-columns:1fr}
  .lesson-nav a.next{text-align:left}
  .terminal pre{font-size:12.5px}
  .topbar{padding:10px 16px;font-size:12px}
  .topbar nav{gap:12px}
  .modeline{flex-wrap:wrap}
  .modeline .pos{border-left:0}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}

/* Focus visibile per la tastiera */
a:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
  border-bottom-color:transparent;
}

/* Stampa */
@media print{
  body{background:#fff;color:#000}
  body::before{display:none}
  .topbar,.lesson-nav,.footer{display:none}
  .terminal{background:#f6f6f4;border-color:#ccc}
  .terminal pre,code,kbd{color:#000}
}

/* ============================================================
   AGGIUNTA — pagina di storia: etichetta e cronologia
   ============================================================ */

.block-label.storia{color:var(--magenta);border-color:rgba(217,122,172,.35);background:rgba(217,122,172,.07)}

/* Cronologia verticale */
.timeline{
  margin:34px 0 40px;
  padding-left:26px;
  border-left:1px solid var(--line);
  max-width:66ch;
}
.timeline .ev{
  position:relative;
  padding-bottom:30px;
}
.timeline .ev:last-child{padding-bottom:0}
.timeline .ev::before{
  content:"";
  position:absolute;
  left:-31px;
  top:9px;
  width:9px;height:9px;
  border-radius:50%;
  background:var(--bg);
  border:1px solid var(--ink-faint);
}
.timeline .ev.key::before{background:var(--amber);border-color:var(--amber)}
.timeline .year{
  font-family:var(--mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--ink-faint);
  display:block;
  margin-bottom:5px;
}
.timeline .ev.key .year{color:var(--amber)}
.timeline .ev h4{
  font-family:var(--serif);
  font-weight:600;
  font-size:20px;
  line-height:1.3;
  margin-bottom:6px;
}
.timeline .ev p{
  font-size:16.5px;
  color:var(--ink-dim);
  margin:0;
}

/* Schema della tastiera ADM-3A */
.keyboard{
  font-family:var(--mono);
  font-size:13px;
  background:var(--bg-term);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:18px;
  margin:24px 0 26px;
  overflow-x:auto;
  color:var(--ink-dim);
  line-height:1.8;
}
.keyboard .k{color:var(--amber);font-weight:700}
.keyboard .note{color:var(--ink-faint);font-style:italic}

@media (max-width:640px){
  .timeline{padding-left:20px}
  .timeline .ev::before{left:-25px}
  .keyboard{font-size:11.5px}
}