/* Motor comun – site-uri TIC cu hero animat la scroll
   Liceul Teoretic „Panait Cerna" Brăila */
:root{
  --bg:#0b1020; --bg2:#121a33; --ink:#e8ecf8; --muted:#9aa6c7;
  --accent:#4cc9f0; --accent2:#7b61ff; --card:#161f3d; --line:#26325c;
  --radius:18px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
img{max-width:100%}

/* Teme pe clase */
body[data-theme="hardware"]{--accent:#4cc9f0;--accent2:#3a86ff}
body[data-theme="retele"]{--accent:#00f5d4;--accent2:#00bbf9}
body[data-theme="date"]{--accent:#80ed99;--accent2:#38b000}
body[data-theme="web"]{--accent:#ffbe0b;--accent2:#fb5607}
body[data-theme="securitate"]{--accent:#ff4d6d;--accent2:#c9184a}

/* Bara de sus */
.topbar{position:fixed;inset:0 0 auto 0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px;background:linear-gradient(var(--bg),transparent)}
.topbar a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem}
.topbar .tag{font-size:.8rem;color:var(--muted)}
.progress{position:fixed;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));z-index:60}

/* HERO lipit la scroll */
.hero{position:relative;height:420vh}
.hero-stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden}
.hero canvas,.hero video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.hero video{opacity:0;transition:opacity .6s}
.hero.has-video video{opacity:1}
.hero.has-video canvas{opacity:0}
.hero-shade{position:absolute;inset:0;background:radial-gradient(ellipse at center,transparent 40%,rgba(5,8,18,.75));pointer-events:none}
.hero-title{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);text-align:center;padding:0 16px;transition:opacity .4s,transform .4s}
.hero-title .kicker{display:inline-block;font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);border:1px solid var(--accent);padding:4px 12px;border-radius:99px;margin-bottom:16px;background:rgba(0,0,0,.35)}
.hero-title h1{font-size:clamp(2.2rem,7vw,5rem);line-height:1.05;font-weight:800;letter-spacing:-.02em;text-shadow:0 4px 30px rgba(0,0,0,.6)}
.hero-title p{margin-top:14px;color:var(--muted);font-size:clamp(1rem,2.2vw,1.25rem);text-shadow:0 2px 12px rgba(0,0,0,.8)}
.hero.scrolled .hero-title{opacity:0;transform:translateY(-60%)}
.scroll-hint{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);font-size:.8rem;color:var(--muted);letter-spacing:.1em;animation:bob 1.8s infinite}
.hero.scrolled .scroll-hint{opacity:0}
@keyframes bob{50%{transform:translate(-50%,6px)}}

/* Etichete care apar la scroll */
.labels{position:absolute;left:16px;right:16px;bottom:9vh;display:flex;justify-content:center;pointer-events:none}
.label{position:absolute;bottom:0;left:50%;max-width:520px;width:100%;background:rgba(10,14,30,.82);backdrop-filter:blur(8px);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:14px;padding:16px 20px;opacity:0;transform:translate(-50%,24px);transition:opacity .45s,transform .45s}
.label.on{opacity:1;transform:translate(-50%,0)}
.label b{display:block;color:var(--accent);font-size:1.1rem;margin-bottom:2px}
.label span{color:var(--ink);font-size:.95rem}
.label .num{float:right;color:var(--muted);font-size:.8rem}

/* Conținut */
main{position:relative;z-index:2;background:var(--bg)}
section.block{max-width:1100px;margin:0 auto;padding:90px 20px}
section.block h2{font-size:clamp(1.6rem,4vw,2.5rem);line-height:1.15;margin-bottom:14px}
section.block > p.lead{color:var(--muted);max-width:720px;font-size:1.1rem;margin-bottom:36px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2))}
.card .ico{font-size:1.8rem;margin-bottom:10px}
.card h3{font-size:1.15rem;margin-bottom:6px}
.card p{color:var(--muted);font-size:.97rem}
.card code,.block code{background:#0a0f22;border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:.9em;color:var(--accent)}
.steps{counter-reset:s;display:grid;gap:14px}
.steps li{list-style:none;counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px 18px 64px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;font-weight:700;background:var(--accent);color:#081018}
.steps li b{display:block;margin-bottom:2px}
.steps li span{color:var(--muted)}
.callout{margin-top:28px;padding:20px 22px;border-radius:14px;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 16%,transparent),transparent);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent)}
.callout b{color:var(--accent)}

/* Întrebări de verificare */
details.q{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
details.q summary{cursor:pointer;font-weight:600;list-style:none}
details.q summary::after{content:"＋";float:right;color:var(--accent)}
details.q[open] summary::after{content:"－"}
details.q p{margin-top:10px;color:var(--muted)}

footer{text-align:center;color:var(--muted);font-size:.85rem;padding:50px 20px;border-top:1px solid var(--line)}
footer a{color:var(--muted)}

/* Animații de apariție */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.grid .reveal:nth-child(2){transition-delay:.08s}
.grid .reveal:nth-child(3){transition-delay:.16s}
.grid .reveal:nth-child(4){transition-delay:.24s}

/* Pagina de start */
.home-hero{min-height:70vh;display:grid;place-items:center;text-align:center;padding:120px 20px 40px;background:radial-gradient(ellipse at top,#1b2650,var(--bg) 70%)}
.home-hero h1{font-size:clamp(2.2rem,6vw,4.2rem);line-height:1.05;font-weight:800}
.home-hero p{color:var(--muted);margin-top:14px;font-size:1.15rem}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.tile{display:block;text-decoration:none;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:transform .25s,border-color .25s}
.tile:hover{transform:translateY(-4px);border-color:var(--c)}
.tile .cls{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--c)}
.tile h3{font-size:1.35rem;margin:6px 0}
.tile p{color:var(--muted);font-size:.95rem}

@media (prefers-reduced-motion:reduce){
  .hero{height:auto}
  .hero-stage{position:relative;height:80vh}
  .labels{position:relative;bottom:auto;left:auto;right:auto;flex-direction:column;gap:10px;padding:20px;background:var(--bg)}
  .label{position:relative;left:auto;opacity:1;transform:none}
  .reveal{opacity:1;transform:none;transition:none}
  .scroll-hint{display:none}
}
@media (max-width:640px){
  .label{padding:13px 16px}
  section.block{padding:64px 16px}
}

/* Două seturi de etichete: pentru clip video și pentru animația din cod */
.hero.has-video .labels[data-for="canvas"],
.hero:not(.has-video) .labels[data-for="video"]{display:none}

/* Fotografie în lecție */
figure.photo{margin:0 0 22px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:var(--card)}
figure.photo img{display:block;width:100%;height:auto}
figure.photo figcaption{padding:12px 18px;color:var(--muted);font-size:.9rem}
.grid > details.q{margin-bottom:0}