/* ==========================================================================
   carte.css — cartea interactivă „Fluxuri de lucru pentru știința datelor”
   Cuprins lateral (spine), coloana de lectură și blocurile de conținut.
   Variabilele sunt declarate aici, pe :root, dar fișierul este link-uit NUMAI
   din paginile acestui curs, deci nu afectează celelalte cursuri din repo.
   ========================================================================== */

:root{
  --ink:#16181A;
  --paper:#E8E8E4;
  --surface:#FFFFFF;
  --panel:#1E2022;
  --panel-2:#2A2D30;
  --olive:#6E7358;
  --olive-lt:#8D9472;
  --slate:#3D4451;
  --muted:#5C6165;
  --rule:rgba(22,24,26,.13);
  --rule-strong:rgba(22,24,26,.28);
  --ok:#4F6B3E;
  --no:#8C3B2E;
  --sans:'Archivo',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --serif:'Literata',Georgia,'Times New Roman',serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --spine-w:288px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer}
a{color:inherit}
:focus-visible{outline:2.5px solid var(--olive);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* ---------- SPINE / CUPRINS LATERAL ---------- */
.spine{
  position:fixed;inset:0 auto 0 0;width:var(--spine-w);
  background:var(--panel);color:#EDEDE9;
  display:flex;flex-direction:column;z-index:40;
}
.spine__head{padding:26px 24px 20px;border-bottom:1px solid rgba(255,255,255,.1)}
.mark{display:flex;align-items:center;gap:11px;text-decoration:none;color:inherit}
.mark svg{flex:none}
.mark__t{font-family:var(--sans);font-weight:800;font-size:12px;letter-spacing:.16em;line-height:1.3}
.mark__s{font-family:var(--sans);font-weight:500;font-size:10.5px;letter-spacing:.1em;color:rgba(237,237,233,.5);margin-top:3px}
.spine__title{font-family:var(--sans);font-weight:700;font-size:15.5px;line-height:1.32;margin:16px 0 0}

.spine__scroll{flex:1;overflow-y:auto;padding:14px 0 30px}
.spine__scroll::-webkit-scrollbar{width:7px}
.spine__scroll::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:4px}

.part{font-family:var(--sans);font-weight:700;font-size:9.5px;letter-spacing:.19em;
  color:rgba(237,237,233,.4);padding:20px 24px 8px}

.ch{position:relative;padding-left:24px}
.ch__line{position:absolute;left:33px;top:0;bottom:0;width:2px;background:rgba(255,255,255,.13)}
.ch:last-child .ch__line{bottom:auto;height:20px}

.ch__btn{position:relative;display:flex;align-items:flex-start;gap:12px;width:100%;
  background:none;border:0;padding:7px 18px 7px 0;text-align:left;color:inherit}
.dot{flex:none;width:20px;height:20px;border-radius:50%;border:2px solid rgba(255,255,255,.3);
  background:var(--panel);margin-top:1px;position:relative;z-index:2;
  display:grid;place-items:center;font-family:var(--sans);font-size:9.5px;font-weight:700;
  color:rgba(237,237,233,.62);transition:all .2s}
.ch.is-open .dot,.ch.is-done .dot{border-color:var(--olive-lt);color:#fff}
.ch.is-done .dot{background:var(--olive)}
.ch__name{font-family:var(--sans);font-weight:600;font-size:13.2px;line-height:1.34;
  color:rgba(237,237,233,.78);transition:color .15s}
.ch__btn:hover .ch__name{color:#fff}
.ch.is-open .ch__name{color:#fff}

.secs{display:none;padding:2px 18px 10px 32px}
.ch.is-open .secs{display:block}
.sec{display:block;width:100%;background:none;border:0;text-align:left;
  font-family:var(--sans);font-weight:500;font-size:12.4px;line-height:1.4;
  color:rgba(237,237,233,.52);padding:6px 8px 6px 10px;border-left:2px solid rgba(255,255,255,.11);
  transition:all .15s}
.sec:hover{color:rgba(237,237,233,.9);border-left-color:rgba(255,255,255,.35)}
.sec.is-current{color:#fff;border-left-color:var(--olive-lt);background:rgba(255,255,255,.05)}
.sec.is-seen::after{content:'';display:inline-block;width:5px;height:5px;border-radius:50%;
  background:var(--olive-lt);margin-left:7px;vertical-align:middle}
.sec.soon{opacity:.42;font-style:italic}

/* ---------- COLOANA DE LECTURĂ ---------- */
.wrap{margin-left:var(--spine-w);min-height:100vh;display:flex;flex-direction:column}
.bar{position:sticky;top:0;z-index:20;background:rgba(232,232,228,.93);
  backdrop-filter:blur(9px);border-bottom:1px solid var(--rule)}
.bar__in{max-width:860px;margin:0 auto;padding:11px 40px;display:flex;align-items:center;gap:14px}
.crumb{font-family:var(--sans);font-weight:600;font-size:11.4px;letter-spacing:.05em;color:var(--muted)}
.bar__prog{flex:1;height:3px;background:var(--rule);border-radius:2px;overflow:hidden}
.bar__prog i{display:block;height:100%;background:var(--olive);width:0;transition:width .3s}
.bar__pct{font-family:var(--sans);font-weight:700;font-size:11px;color:var(--muted);min-width:34px;text-align:right}
.burger{display:none;background:none;border:0;padding:6px;color:var(--ink)}

main{flex:1;max-width:860px;width:100%;margin:0 auto;padding:44px 40px 40px}

.eyebrow{font-family:var(--sans);font-weight:700;font-size:10.5px;letter-spacing:.2em;
  color:var(--olive);margin:0 0 12px}
h1{font-family:var(--sans);font-weight:800;font-size:clamp(30px,4.6vw,42px);line-height:1.08;
  letter-spacing:-.02em;margin:0 0 8px}
.deck{font-size:18.5px;line-height:1.55;color:var(--muted);margin:0 0 34px;max-width:60ch}
h2{font-family:var(--sans);font-weight:700;font-size:21px;line-height:1.25;letter-spacing:-.01em;
  margin:42px 0 12px}
main p{margin:0 0 19px;max-width:68ch}
strong{font-weight:600}
main ul{margin:0 0 20px;padding-left:0;list-style:none;max-width:68ch}
main ul li{position:relative;padding-left:22px;margin-bottom:9px}
main ul li::before{content:'';position:absolute;left:4px;top:.66em;width:6px;height:6px;
  background:var(--olive);border-radius:1px}
code{font-family:var(--mono);font-size:.87em;background:rgba(22,24,26,.065);
  padding:2px 5px;border-radius:3px}

.note{border-left:3px solid var(--olive);background:rgba(110,115,88,.075);
  padding:16px 20px;margin:0 0 24px;max-width:68ch;font-size:16px}
.note b{font-family:var(--sans);font-weight:700;font-size:10.5px;letter-spacing:.14em;
  display:block;color:var(--olive);margin-bottom:5px}
.note p{margin:0;max-width:none}

.codeblk{background:var(--panel);color:#E4E4E0;border-radius:6px;padding:17px 20px;
  margin:0 0 24px;font-family:var(--mono);font-size:13.4px;line-height:1.75;overflow-x:auto;
  white-space:pre}
.codeblk .c{color:#8D9472}
.codeblk .k{color:#C4A86A}

.tbl{width:100%;border-collapse:collapse;margin:0 0 26px;font-size:15px}
.tbl th{font-family:var(--sans);font-weight:700;font-size:10.5px;letter-spacing:.13em;
  text-align:left;padding:8px 12px 8px 0;border-bottom:2px solid var(--rule-strong);color:var(--muted)}
.tbl td{padding:11px 12px 11px 0;border-bottom:1px solid var(--rule);vertical-align:top}
.tbl td:first-child{font-family:var(--mono);font-size:13px;white-space:nowrap;width:1%;padding-right:26px}

/* ---------- NAVIGARE ÎNTRE SECȚIUNI ---------- */
.nav{display:flex;justify-content:space-between;gap:14px;margin-top:52px;
  padding-top:26px;border-top:1px solid var(--rule-strong)}
.nav__b{font-family:var(--sans);font-weight:600;font-size:13.5px;padding:12px 20px;border-radius:6px;
  border:1.5px solid var(--rule-strong);background:none;color:var(--ink);transition:.15s;max-width:47%;
  text-decoration:none;display:block}
.nav__b:hover{border-color:var(--ink);background:var(--surface)}
.nav__b small{display:block;font-size:10px;letter-spacing:.15em;font-weight:700;color:var(--muted);margin-bottom:3px}
.nav__b--next{background:var(--ink);border-color:var(--ink);color:#fff;text-align:right}
.nav__b--next:hover{background:var(--slate);border-color:var(--slate)}
.nav__b--next small{color:rgba(255,255,255,.55)}

.soonbox{background:var(--surface);border:1px dashed var(--rule-strong);border-radius:8px;
  padding:34px;text-align:center;color:var(--muted);font-size:15.5px}
.soonbox b{font-family:var(--sans);display:block;font-size:14px;color:var(--ink);margin-bottom:6px}

/* ---------- la_proiect: aplicarea la sursele proiectului ---------- */
.la-proiect{position:relative;background:var(--surface);border:1px solid var(--rule-strong);
  border-left:5px solid var(--olive-lt);border-radius:0 8px 8px 0;
  padding:16px 20px 6px;margin:0 0 24px;max-width:68ch}
.la-proiect>b{font-family:var(--sans);font-weight:800;font-size:9.5px;letter-spacing:.16em;
  display:inline-block;color:#15170F;background:var(--olive-lt);padding:3px 9px;border-radius:3px;
  margin:0 0 10px}
.la-proiect__c p{margin:0 0 14px}
.la-proiect__c :last-child{margin-bottom:14px}

/* ---------- rezultat: constatarea de final, evidențiată ---------- */
.rezultat{background:rgba(110,115,88,.13);border:1px solid var(--olive);border-radius:8px;
  padding:20px 22px 8px;margin:28px 0 24px;max-width:68ch}
.rezultat>b{font-family:var(--sans);font-weight:800;font-size:10px;letter-spacing:.17em;
  display:block;color:var(--olive);margin:0 0 8px}
.rezultat__c p{margin:0 0 12px;font-size:17.5px}
.rezultat__c strong{font-weight:600}

/* ---------- limite: ce nu poate spune, sobru ---------- */
.limite{border:1px solid var(--rule-strong);border-radius:8px;background:transparent;
  padding:16px 20px 4px;margin:0 0 24px;max-width:68ch;color:var(--muted)}
.limite>b{font-family:var(--sans);font-weight:700;font-size:9.5px;letter-spacing:.16em;
  display:block;color:var(--muted);margin:0 0 8px}
.limite__c p{margin:0 0 12px;font-size:15.5px}

/* ---------- lecturi: bibliografie ---------- */
.lecturi{border-top:2px solid var(--rule-strong);padding:20px 0 0;margin:34px 0 24px;max-width:68ch}
.lecturi>b{font-family:var(--sans);font-weight:700;font-size:11px;letter-spacing:.14em;
  display:block;color:var(--olive);margin:0 0 12px}
.lecturi__list{margin:0;padding:0 0 0 22px;list-style:decimal}
.lecturi__list li{font-size:14.5px;line-height:1.55;color:var(--ink);margin:0 0 10px;padding-left:4px}
.lecturi__list a{color:var(--olive);text-decoration:underline;text-underline-offset:2px}
.lecturi__list i{font-style:italic}

.scrim{display:none;position:fixed;inset:0;background:rgba(22,24,26,.5);z-index:35}

/* focus vizibil pe titlul secțiunii când mutăm focarul programatic */
h1[tabindex]:focus{outline:none}
h1[tabindex]:focus-visible{outline:2.5px solid var(--olive);outline-offset:4px}

@media(max-width:940px){
  :root{--spine-w:0px}
  .spine{transform:translateX(-100%);transition:transform .25s ease;width:290px}
  body.menu .spine{transform:none}
  body.menu .scrim{display:block}
  .wrap{margin-left:0}
  .burger{display:block}
  .bar__in{padding:10px 20px}
  main{padding:30px 20px 34px}
}