/* ═══════════════════════════════════════════
   CS50 Farsi — dark vault
   ═══════════════════════════════════════════ */
:root{
  --bg:#0a0e14; --bg2:#0d131c; --surface:#111823; --surface2:#151f2c;
  --line:#1f2c3d; --line2:#2b3c52;
  --fg:#e8eef7; --muted:#a3b4c9; --dim:#7d8fa6;
  --cyan:#2ad4ee; --gold:#f7c948; --green:#3ddc97; --red:#ff6b6b; --violet:#a78bfa;
  --radius:14px; --maxw:1080px;
  --ff:"Vazirmatn","IRANSans","Segoe UI",Tahoma,sans-serif;
  --mono:"Cascadia Code",Consolas,"Courier New",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--fg);font-family:var(--ff);
  font-size:16.5px;line-height:1.95;direction:rtl;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(900px 500px at 88% -8%,rgba(42,212,238,.10),transparent 60%),
    radial-gradient(700px 420px at 4% 4%,rgba(247,201,72,.06),transparent 60%);
  background-attachment:fixed;
}
#grain{
  position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.5;
  background-image:linear-gradient(transparent 50%,rgba(255,255,255,.012) 50%);
  background-size:100% 3px;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;position:relative;z-index:1}

/* ── HERO ── */
.hero{padding:78px 0 46px;position:relative;z-index:1}
.kicker{
  display:inline-block;font-size:.82rem;color:var(--cyan);border:1px solid rgba(42,212,238,.35);
  background:rgba(42,212,238,.07);padding:5px 14px;border-radius:99px;margin:0 0 22px
}
.hero h1{
  font-size:clamp(2.1rem,6.2vw,3.9rem);line-height:1.28;margin:0 0 22px;font-weight:800;letter-spacing:-.4px
}
.hero h1 .hl{color:var(--cyan)}
.hero h1 .strike{
  position:relative;color:var(--dim);white-space:nowrap
}
.hero h1 .strike::after{
  content:"";position:absolute;inset-inline:-4px;top:52%;height:4px;border-radius:2px;
  background:var(--red);transform:scaleX(1) rotate(-6deg);box-shadow:0 0 14px rgba(255,107,107,.55)
}
.hero h1 .free{color:var(--green);display:inline-block}
.lede{max-width:62ch;color:var(--muted);font-size:1.08rem;margin:0 0 30px}
.lede b{color:var(--fg)}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:42px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:11px;font:inherit;font-weight:700;cursor:pointer;
  text-decoration:none;border:1px solid transparent;transition:.18s transform,.18s background,.18s border-color
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--cyan),#1aa8c4);color:#04222a}
.btn-primary:hover{box-shadow:0 8px 26px rgba(42,212,238,.32)}
.btn-ghost{background:transparent;border-color:var(--line2);color:var(--fg)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-block{width:100%;padding:14px}

.hero-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.fact{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.fact b{display:block;font-size:1.5rem;color:var(--gold);line-height:1.4}
.fact span{font-size:.84rem;color:var(--dim)}

/* ── SECTIONS ── */
section{padding:52px 0;border-top:1px solid var(--line)}
section:first-of-type{border-top:none}
h2{font-size:clamp(1.5rem,3.6vw,2.15rem);margin:0 0 20px;font-weight:800;line-height:1.5}
h2 .num{
  display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;
  background:rgba(42,212,238,.1);border:1px solid rgba(42,212,238,.3);color:var(--cyan);
  border-radius:10px;font-size:1.05rem;margin-left:12px;vertical-align:middle
}
p{margin:0 0 16px;max-width:78ch}
b{color:var(--fg);font-weight:700}
a{color:var(--cyan);text-decoration:none;border-bottom:1px dotted rgba(42,212,238,.5)}
a:hover{border-bottom-style:solid}
code{
  font-family:var(--mono);font-size:.88em;background:#0c1420;border:1px solid var(--line);
  padding:2px 7px;border-radius:6px;color:var(--gold);direction:ltr;display:inline-block
}

.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin:26px 0}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px;margin:26px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px}
.card h3{margin:0 0 10px;font-size:1.06rem;color:var(--cyan);line-height:1.6}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.card-cyan{border-color:rgba(42,212,238,.28);background:linear-gradient(180deg,rgba(42,212,238,.05),var(--surface))}

.callout{
  background:var(--surface);border:1px solid var(--line);border-inline-start:4px solid var(--cyan);
  border-radius:var(--radius);padding:20px 24px;margin:24px 0
}
.callout h4{margin:0 0 10px;font-size:1.05rem;color:var(--cyan)}
.callout p,.callout li{color:var(--muted);font-size:.95rem}
.callout-honest{border-inline-start-color:var(--gold)}
.callout-honest h4{color:var(--gold)}
.callout-trap{border-inline-start-color:var(--red);background:linear-gradient(180deg,rgba(255,107,107,.06),var(--surface))}
.callout-trap h4{color:var(--red)}
ul.plain{padding-inline-start:20px;margin:8px 0 0}
ul.plain li{margin-bottom:12px}

/* ── COMPARE ── */
.compare{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:stretch;margin:26px 0}
.cmp{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.cmp h3{margin:0 0 12px;font-size:1rem}
.cmp ul{margin:0;padding-inline-start:18px}
.cmp li{color:var(--muted);font-size:.93rem;margin-bottom:7px}
.cmp-a{border-color:rgba(255,107,107,.3)}
.cmp-a h3{color:var(--red)}
.cmp-b{border-color:rgba(61,220,151,.35);background:linear-gradient(180deg,rgba(61,220,151,.06),var(--surface))}
.cmp-b h3{color:var(--green)}
.cmp-c{display:flex;align-items:center;justify-content:center}
.vs{
  writing-mode:vertical-rl;background:var(--line);color:var(--dim);padding:12px 6px;
  border-radius:99px;font-size:.72rem;letter-spacing:1px
}
.green{color:var(--green)}

.quote-block{background:linear-gradient(180deg,rgba(247,201,72,.07),var(--surface));border:1px solid rgba(247,201,72,.3);border-radius:var(--radius);padding:22px 26px;margin:24px 0}
.quote-en{color:var(--fg);font-style:italic;border-inline-start:3px solid var(--gold);padding-inline-start:16px;direction:ltr;text-align:left;margin:0 0 16px}
.quote-en b{color:var(--gold)}
.quote-en.small{font-size:.9rem;margin:12px 0}
.quote-en .src{display:block;font-style:normal;font-size:.76rem;color:var(--dim);margin-top:6px;direction:rtl;text-align:right}
.quote-fa{color:var(--muted);margin:0;font-size:.97rem}

/* ── ROADMAP ── */
ol.road{counter-reset:r;list-style:none;padding:0;margin:24px 0;display:grid;gap:12px;grid-template-columns:repeat(2,1fr)}
ol.road li{
  counter-increment:r;display:grid;grid-template-columns:26px 1fr;gap:0 12px;align-content:start;
  padding:16px 16px 15px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius);transition:border-color .15s,transform .15s
}
ol.road li:hover{border-color:rgba(42,212,238,.35);transform:translateY(-2px)}
ol.road li::before{
  content:counter(r,persian);grid-column:1;grid-row:1/span 2;width:26px;height:26px;
  display:flex;align-items:center;justify-content:center;background:rgba(42,212,238,.1);
  border:1px solid rgba(42,212,238,.3);color:var(--cyan);border-radius:8px;font-weight:800;font-size:.82rem
}
ol.road b{grid-column:2;color:var(--fg);font-size:1rem;line-height:1.7;margin-bottom:5px}
ol.road p{grid-column:2;margin:0;color:var(--muted);font-size:.9rem;line-height:1.95}
ol.road p code{font-size:.82em}

.checklist{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:8px;margin-top:12px}
.chk{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;background:var(--bg2);border:1px solid var(--line);border-radius:10px;cursor:pointer;font-size:.9rem;color:var(--muted);transition:.15s}
.chk:hover{border-color:var(--line2)}
.chk input{margin:5px 0 0;accent-color:var(--cyan);width:16px;height:16px;flex:0 0 auto;cursor:pointer}
.chk:has(input:checked){color:var(--fg);border-color:rgba(61,220,151,.4);background:rgba(61,220,151,.05)}
.chk:has(input:checked) span{text-decoration:line-through;text-decoration-color:rgba(61,220,151,.5)}

/* ── LOCK ── */
.lock{
  background:linear-gradient(180deg,rgba(167,139,250,.07),var(--surface));
  border:1px dashed rgba(167,139,250,.4);border-radius:20px;padding:38px 28px;text-align:center;margin:26px 0
}
.lock-icon{color:var(--violet);opacity:.9;margin-bottom:10px}
.lock h3{margin:0 0 10px;font-size:1.35rem;color:var(--fg)}
.lock p{color:var(--muted);margin:0 auto 24px;max-width:56ch}

.gate{max-width:420px;margin:0 auto;background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:22px;text-align:right}
.field{margin-bottom:16px}
.field label{display:block;margin-bottom:6px;font-size:.87rem;font-weight:700;color:var(--fg)}
.field .opt{color:var(--dim);font-weight:400}
.field input{
  width:100%;padding:12px 14px;background:#0a1017;border:1px solid var(--line2);border-radius:10px;
  color:var(--fg);font:inherit;font-size:.95rem;direction:rtl;transition:.15s
}
.field input:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(42,212,238,.14)}
.field input[aria-invalid="true"]{border-color:var(--red);box-shadow:0 0 0 3px rgba(255,107,107,.12)}
.err{display:none;color:var(--red);font-size:.78rem;margin-top:5px}
.err.show{display:block}
.fineprint{display:flex;gap:8px;align-items:flex-start;color:var(--dim);font-size:.76rem;margin:14px 0 0;line-height:1.7;max-width:none;text-align:right}
.fineprint svg{flex:0 0 auto;margin-top:4px;color:var(--green)}
.gate-status{min-height:1.4em;color:var(--green);font-size:.85rem;margin:12px 0 0}
.lead-note{margin:12px 0 0;padding:10px 12px;border:1px solid rgba(245,197,66,.35);border-radius:12px;background:rgba(245,197,66,.08);color:var(--gold);font-size:.86rem;line-height:1.9}
.lead-note[hidden]{display:none}

.unlocked[hidden]{display:none}
.unlocked-head{text-align:center;margin-bottom:22px}
.ok{font-size:1.15rem;color:var(--green);margin:0 0 6px}
.ok b{color:var(--fg)}
.ok-sub{color:var(--muted);margin:0;font-size:.92rem}

.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px;justify-content:center}
.chip{
  background:transparent;border:1px solid var(--line2);color:var(--muted);font:inherit;font-size:.85rem;
  padding:7px 16px;border-radius:99px;cursor:pointer;transition:.15s
}
.chip:hover{border-color:var(--cyan);color:var(--cyan)}
.chip.is-on{background:rgba(42,212,238,.13);border-color:var(--cyan);color:var(--cyan);font-weight:700}

/* ── PROJECTS ── */
.projects{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;margin-bottom:18px}
.proj{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.18s}
.proj:hover{border-color:var(--line2);transform:translateY(-2px)}
.proj.done{border-color:rgba(61,220,151,.45)}
.proj-h{display:flex;gap:14px;align-items:flex-start;padding:18px 20px;width:100%;background:none;border:none;color:inherit;font:inherit;cursor:pointer;text-align:right}
.proj-n{
  flex:0 0 auto;width:42px;height:42px;display:flex;align-items:center;justify-content:center;
  background:var(--bg2);border:1px solid var(--line2);border-radius:11px;color:var(--cyan);
  font-weight:800;font-size:.95rem;line-height:1
}
.proj-t{flex:1;min-width:0}
.proj-t h3{margin:0 0 2px;font-size:1.02rem;line-height:1.6}
.proj-t p{margin:0;color:var(--dim);font-size:.82rem}
.proj-caret{flex:0 0 auto;color:var(--dim);transition:.2s;margin-top:8px}
.proj.open .proj-caret{transform:rotate(180deg);color:var(--cyan)}
.tags{display:flex;gap:6px;flex-wrap:wrap;padding:0 20px 16px}
.tag{font-size:.7rem;background:var(--bg2);border:1px solid var(--line);color:var(--dim);padding:3px 9px;border-radius:6px}
.tag-h{color:var(--gold);border-color:rgba(247,201,72,.3)}

.proj-b{display:none;padding:0 20px 20px;border-top:1px solid var(--line);margin-top:2px}
.proj.open .proj-b{display:block}
.proj-b h4{margin:18px 0 8px;font-size:.9rem;color:var(--gold);display:flex;align-items:center;gap:7px}
.proj-b h4::before{content:"";width:5px;height:15px;background:var(--gold);border-radius:3px}
.proj-b p{font-size:.91rem;color:var(--muted);margin:0 0 8px}
.proj-b ol,.proj-b ul{margin:0 0 8px;padding-inline-start:20px}
.proj-b li{font-size:.9rem;color:var(--muted);margin-bottom:6px}
/* ── NEW: richer tutorial blocks ── */
.proj-headline{font-size:1rem;color:var(--fg);font-weight:600;margin:0 0 10px;line-height:1.75}
.proj-teach p{margin:0 0 10px}
.build-list li{color:var(--fg)}
.steps li{margin-bottom:9px;line-height:1.85}
.steps li::marker{color:var(--gold);font-weight:700}
.hard{
  background:rgba(42,212,238,.05);border:1px solid rgba(42,212,238,.25);
  border-radius:12px;padding:14px 16px;margin:16px 0
}
.hard h4{margin-top:0}
.hard .hard-what{color:var(--fg);font-size:.92rem;margin:0 0 10px}
.hard-how{counter-reset:hs}
.hard-how li{margin-bottom:7px}
.verify-list li{margin-bottom:8px;line-height:1.8}
.verify-list li::marker{color:var(--cyan,#2ad4ee)}
.lock-honest{
  font-size:.88rem;color:var(--muted);line-height:1.85;margin:0 0 18px;
  border-inline-start:3px solid var(--gold);padding-inline-start:12px
}
.real-talk{margin:16px 0 0;text-align:start}
.real-talk h4{margin-top:0}
.trap-list{list-style:none;padding:0}
.trap-list li{
  background:rgba(255,107,107,.055);border:1px solid rgba(255,107,107,.22);border-radius:9px;
  padding:10px 13px;margin-bottom:7px;font-size:.88rem;color:var(--muted);position:relative;padding-inline-start:34px
}
.trap-list li::before{content:"!";position:absolute;inset-inline-start:12px;top:9px;width:16px;height:16px;
  background:var(--red);color:#2a0808;border-radius:50%;font-size:.72rem;font-weight:900;
  display:flex;align-items:center;justify-content:center}
.submit-line{
  margin-top:16px;padding:12px 14px;background:#0a1017;border:1px solid var(--line2);border-radius:10px;
  font-family:var(--mono);font-size:.82rem;color:var(--gold);direction:ltr;text-align:left;word-break:break-all
}
.proj-links{display:flex;gap:14px;flex-wrap:wrap;margin-top:12px;font-size:.85rem}
.proj-foot{margin-top:16px;padding-top:12px;border-top:1px solid var(--line);display:flex;justify-content:flex-end}
.mark-done{display:flex;align-items:center;gap:8px;font-size:.82rem;color:var(--dim);cursor:pointer;
  background:none;border:none;font-family:var(--inherit)}
.mark-done input{accent-color:var(--green);width:15px;height:15px;cursor:pointer}

/* ── TRAPS ── */
.traps .trap{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px}
.traps .trap h3{margin:0 0 8px;font-size:1rem;color:var(--red);line-height:1.6}
.traps .trap p{margin:0;font-size:.92rem;color:var(--muted)}

/* ── FOOTER ── */
.foot{
  border-top:1px solid var(--line);margin-top:40px;padding:30px 20px 40px;text-align:center;position:relative;z-index:1
}
.foot-line{margin:0 0 8px;font-size:1rem;color:var(--muted)}
.foot-line a{font-weight:800;color:var(--cyan);border-bottom:1px solid rgba(42,212,238,.5)}
.foot .gh{vertical-align:-2px;margin-inline-start:4px;opacity:.85}
.foot-sub{margin:0;font-size:.78rem;color:var(--dim)}

/* ── RESPONSIVE ── */
@media (max-width:640px){
  body{font-size:15.5px}
  .hero{padding:48px 0 30px}
  section{padding:38px 0}
  .compare{grid-template-columns:1fr}
  .cmp-c{padding:2px 0}
  .vs{writing-mode:horizontal-tb;padding:6px 16px}
  .gate{padding:18px}
  .proj-h{padding:15px 16px;gap:11px}
  .tags,.proj-b{padding-inline:16px}
  ol.road{grid-template-columns:1fr}
  ol.road li{padding:16px 15px 14px}
  ol.road b{padding-inline-end:30px}
}

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