/* ============================================================
   کلاس بازی‌سازی با Godot — design system
   palette taken from webGameDev/roadmap.html (copper · gold · cream · redwood)
   ============================================================ */
@font-face{font-family:Vazirmatn;font-style:normal;font-weight:400;font-display:swap;
  src:url(/fonts/Vazirmatn-Regular.woff2) format("woff2")}
@font-face{font-family:Vazirmatn;font-style:normal;font-weight:500;font-display:swap;
  src:url(/fonts/Vazirmatn-Medium.woff2) format("woff2")}
@font-face{font-family:Vazirmatn;font-style:normal;font-weight:700;font-display:swap;
  src:url(/fonts/Vazirmatn-Bold.woff2) format("woff2")}
@font-face{font-family:Vazirmatn;font-style:normal;font-weight:800;font-display:swap;
  src:url(/fonts/Vazirmatn-ExtraBold.woff2) format("woff2")}

:root{
  /* ── roadmap.html palette ── */
  --bg:#1a1015;
  --surface:#241a1f;
  --cream:#eed3b4;
  --redwood:#ab3d3b;
  --espresso:#3d1c14;
  --navy:#3b3754;
  --copper:#be7237;
  --gold:#e5a364;
  --blue:#94abd8;
  --green:#34d399;
  --radius:14px;

  /* ── app tokens ── */
  --surface-2:#2e2026;
  --surface-3:#3a2a30;
  --border:#463134;
  --border-2:rgba(190,114,55,.55);
  --text:#e0d7cc;
  --muted:rgba(238,211,180,.74);
  --muted-2:rgba(238,211,180,.5);
  --accent:#be7237;
  --accent-2:#e5a364;
  --ok:#8fbf6a;
  --bad:#e0705f;
  --warn:#e5a364;
  --grad:linear-gradient(135deg,#be7237 0%,#e5a364 100%);
  --grad-2:linear-gradient(135deg,#e5a364 0%,#be7237 100%);
  --shadow:0 8px 26px -14px rgba(0,0,0,.85);
  --glow:0 0 0 1px rgba(190,114,55,.45),0 12px 34px -16px rgba(190,114,55,.6);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--text); min-height:100vh;
  font-family:'Vazirmatn',Tahoma,sans-serif; line-height:1.9;
  font-size:16px; -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(1100px 600px at 88% -8%,rgba(190,114,55,.16),transparent 60%),
    radial-gradient(900px 520px at 5% 3%,rgba(171,61,59,.15),transparent 60%);
  background-attachment:fixed;
}
a{color:var(--gold); text-decoration:none; transition:color .15s}
a:hover{color:var(--cream)}
h1,h2,h3,h4{margin:0 0 .55rem; line-height:1.5; font-weight:800; color:var(--cream)}
h1{font-size:1.65rem; letter-spacing:.01em}
h2{font-size:1.2rem} h3{font-size:1.02rem}
p{margin:.4rem 0}
.muted{color:var(--muted)}
.tiny{font-size:.82rem}
.container{max-width:1120px; margin:0 auto; padding:1.4rem 1rem 4rem}

/* ---------- page background decoration ---------- */
.bg-decor{
  position:fixed; top:-70px; inset-inline-end:-90px; width:440px; height:440px;
  z-index:-1; pointer-events:none; opacity:.09;
}
.bg-decor img{width:100%; height:100%; object-fit:contain}
@media(max-width:820px){ .bg-decor{width:280px;height:280px;top:-50px;inset-inline-end:-70px;opacity:.07} }

/* ---------- top bar ---------- */
.topbar{
  position:sticky; top:0; z-index:40; display:grid;
  grid-template-columns:1fr auto 1fr; align-items:center; gap:.7rem;
  padding:.2rem .9rem .2rem 0;            /* no LEFT padding so the logo snaps to the edge */
  background:rgba(26,16,21,.86); backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
/* RTL grid: column 3 is the LEFT side, column 1 is the RIGHT side.
   Logo -> far left (snapped).  Nav -> centre.  User -> far right. */
.topbar .brand{grid-column:3; grid-row:1; justify-self:end; align-self:center; display:flex; align-items:center; margin:0}
.topbar .brand img{height:74px; width:auto; display:block}
.topbar nav{grid-column:2; grid-row:1; display:flex; gap:.2rem; justify-self:center; flex-wrap:wrap}
.topbar nav a{
  padding:.3rem .68rem; border-radius:50px; color:var(--muted); font-weight:600; font-size:.84rem;
  border:1px solid transparent;
}
.topbar nav a:hover{background:var(--surface-2); color:var(--cream)}
.topbar nav a.active{background:var(--grad); color:#2a1710; box-shadow:0 4px 14px rgba(190,114,55,.45)}
.topbar .user{grid-column:1; grid-row:1; justify-self:start; display:flex; align-items:center; gap:.5rem; font-size:.85rem; color:var(--muted)}
.avatar{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:.82rem;
  background:var(--grad); color:#2a1710; flex:none;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.45rem;
  border:none; cursor:pointer; font-family:inherit; font-weight:700;
  padding:.6rem 1.15rem; border-radius:50px; font-size:.95rem; color:var(--cream);
  background:var(--surface-3); transition:transform .12s,box-shadow .2s,filter .2s,opacity .2s;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--grad); color:#2a1710; box-shadow:0 8px 22px -10px rgba(190,114,55,.9)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-soft{background:var(--surface-3); color:var(--cream); border:1px solid var(--border-2)}
.btn-ghost{background:transparent; color:var(--muted); border:1px solid var(--border)}
.btn-ghost:hover{color:var(--cream); border-color:var(--copper)}
.btn-danger{background:rgba(224,112,95,.1); color:#f0907f; border:1px solid rgba(224,112,95,.4)}
.btn-danger:hover{background:rgba(224,112,95,.22); border-color:rgba(224,112,95,.75); color:#ffb3a5; transform:none}
.btn-block{width:100%}
.btn-sm{padding:.3rem .8rem; font-size:.83rem}
.btn-lg{padding:.8rem 1.7rem; font-size:1.05rem}

/* ---------- cards ---------- */
.card{
  position:relative;
  background:linear-gradient(180deg,var(--surface),rgba(36,26,31,.65));
  border:1px solid var(--border); border-radius:var(--radius);
  padding:1.2rem 1.25rem; margin:1rem 0; box-shadow:var(--shadow);
}
.card::before{
  content:""; position:absolute; top:0; inset-inline-start:14px; inset-inline-end:14px; height:2px;
  background:var(--grad); border-radius:2px; opacity:.45; transition:opacity .3s;
}
.card-hover{transition:transform .18s,box-shadow .25s,border-color .2s}
.card-hover:hover{transform:translateY(-3px); border-color:var(--border-2); box-shadow:0 6px 24px rgba(0,0,0,.4),var(--glow)}
.card-hover:hover::before{opacity:1}
.card-head{display:flex; align-items:center; justify-content:space-between; gap:.8rem; flex-wrap:wrap}
.section-title{display:flex; align-items:center; gap:.5rem; font-size:1.15rem; font-weight:800; margin:1.6rem 0 .6rem; color:var(--cream)}

/* ---------- chips / badges ---------- */
.chip{
  display:inline-flex; align-items:center; gap:.3rem;
  background:var(--surface-2); border:1px solid var(--border); color:var(--muted);
  padding:.16rem .68rem; border-radius:50px; font-size:.78rem; font-weight:600; white-space:nowrap;
}
.chip-accent{color:var(--gold); border-color:rgba(229,163,100,.4); background:rgba(190,114,55,.12)}
.badge{font-size:.78rem; padding:.2rem .68rem; border-radius:50px; white-space:nowrap; font-weight:700}
.badge.ok{background:rgba(143,191,106,.15); color:#a8d27e; border:1px solid rgba(143,191,106,.45)}
.badge.bad{background:rgba(224,112,95,.14); color:#f0907f; border:1px solid rgba(224,112,95,.45)}
.badge.idle{background:var(--surface-2); color:var(--muted); border:1px solid var(--border)}
.badge.gold{background:rgba(229,163,100,.16); color:var(--gold); border:1px solid rgba(229,163,100,.45)}

/* ---------- progress ---------- */
.bar{height:10px; background:var(--surface-3); border-radius:50px; overflow:hidden; margin:.55rem 0 .9rem}
.bar-fill{height:100%; background:var(--grad); border-radius:50px; transition:width .6s cubic-bezier(.2,.8,.2,1)}
.bar-row{display:flex; align-items:center; gap:.7rem; margin:.55rem 0 .9rem}
.bar-row .bar{flex:1; margin:0}
.bar-pct{flex:none; font-weight:800; color:var(--cream); font-size:.9rem; min-width:2.6rem; text-align:center}

/* ---------- exercise list ---------- */
.ex-list{list-style:none; margin:0; padding:0}
.ex-list li{border-top:1px solid var(--border)}
.ex-list li:first-child{border-top:none}
.ex-list a{
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
  padding:.72rem .6rem; color:var(--text); border-radius:12px; transition:background .15s;
}
.ex-list a:hover{background:rgba(190,114,55,.08); color:var(--cream)}
.ex-title{font-weight:700; display:flex; align-items:center; gap:.4rem; color:var(--cream)}
.ex-link{display:flex; align-items:center; justify-content:space-between; gap:1rem; padding:.72rem .6rem; color:var(--text); border-radius:12px; text-decoration:none; transition:background .15s}
.ex-link:hover{background:rgba(190,114,55,.08); color:var(--cream)}

/* ---------- KPI ---------- */
.grid-kpi{display:grid; grid-template-columns:repeat(auto-fit,minmax(165px,1fr)); gap:.9rem}
.kpi{
  position:relative;
  background:linear-gradient(180deg,var(--surface),rgba(36,26,31,.6));
  border:1px solid var(--border); border-radius:var(--radius); padding:1rem 1.1rem; text-align:center;
}
.kpi .n{font-size:2rem; font-weight:800; background:var(--grad-2); -webkit-background-clip:text; background-clip:text; color:transparent; line-height:1.35}
.kpi .l{color:var(--muted); font-size:.88rem}

/* ---------- forms ---------- */
label{display:block; margin:.75rem 0 .3rem; font-size:.9rem; color:var(--muted); font-weight:600}
input[type=text],input[type=password],input[type=number],input[type=file],input[name],textarea,select{
  width:100%; background:#1f1720; color:var(--cream); border:1px solid var(--border);
  border-radius:12px; padding:.62rem .8rem; font-family:inherit; font-size:1rem; transition:border-color .15s,box-shadow .15s;
}
input::placeholder,textarea::placeholder{color:rgba(238,211,180,.32)}
input:focus,textarea:focus,select:focus{outline:none; border-color:var(--copper); box-shadow:0 0 0 3px rgba(190,114,55,.2)}
textarea{resize:vertical; line-height:1.75}
.check{display:flex; align-items:center; gap:.5rem; color:var(--muted); font-weight:500; margin:.7rem 0}
.check input{width:auto}
.opt{
  display:flex; align-items:center; gap:.65rem; background:var(--surface-2);
  border:1px solid var(--border); border-radius:12px; padding:.7rem .9rem; margin:.45rem 0;
  color:var(--cream); font-weight:600; cursor:pointer; transition:border-color .15s,background .15s;
}
.opt input{width:auto}
.opt:hover{border-color:var(--border-2)}
.opt:has(input:checked){border-color:var(--copper); background:rgba(190,114,55,.14); box-shadow:0 0 0 3px rgba(190,114,55,.14)}
.grid2{display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:.9rem}
.grid3{display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:.9rem}

/* ---------- type-aware exercise form (teacher) ---------- */
.type-seg{display:flex; gap:.45rem; flex-wrap:wrap; margin:.35rem 0 1rem}
.type-seg .seg{position:relative; cursor:pointer; margin:0}
.type-seg .seg input{position:absolute; inset:0; width:100%; height:100%; margin:0; opacity:0; cursor:pointer}
.type-seg .seg span{
  display:inline-flex; align-items:center; gap:.35rem; padding:.5rem 1.05rem; border-radius:50px;
  border:1px solid var(--border); background:var(--surface-3); color:var(--muted);
  font-weight:700; font-size:.88rem; transition:background .15s,color .15s,border-color .15s,box-shadow .15s;
}
.type-seg .seg:hover span{border-color:var(--copper)}
.type-seg .seg input:focus-visible + span{box-shadow:0 0 0 3px rgba(190,114,55,.28)}
.type-seg .seg input:checked + span{background:var(--grad); color:#2a1710; border-color:transparent; box-shadow:0 4px 14px rgba(190,114,55,.4)}
.hintline{margin:.3rem 0 0; font-size:.78rem; color:var(--muted); font-weight:500}
.hintline code{background:var(--surface-3); border-radius:6px; padding:.05rem .35rem; font-size:.9em}
.fgroup[hidden]{display:none}

/* option rows (multiple-choice) */
.opt-list{display:flex; flex-direction:column; gap:.5rem; margin:.35rem 0 .6rem}
.opt-row{display:flex; align-items:center; gap:.55rem}
.opt-row .opt-text{flex:1; width:auto; margin:0}
.opt-pick{position:relative; display:inline-flex; align-items:center; flex:none; margin:0; cursor:pointer; padding:4px}
.opt-pick input{position:absolute; inset:0; width:100%; height:100%; margin:0; opacity:0; cursor:pointer}
.opt-dot{width:20px; height:20px; border-radius:50%; border:2px solid var(--border); transition:background .15s,border-color .15s,box-shadow .15s}
.opt-pick:hover .opt-dot{border-color:var(--copper)}
.opt-pick input:checked + .opt-dot{border-color:var(--copper); background:var(--grad); box-shadow:inset 0 0 0 3px var(--surface-2)}
.opt-del{flex:none; width:34px; height:34px; border-radius:9px; border:1px solid var(--border); background:transparent; color:var(--muted); font-size:.8rem; cursor:pointer; line-height:1}
.opt-del:hover{border-color:#e0567a; color:#e0567a}
.btn-sm{padding:.35rem .7rem; font-size:.82rem}

/* per-session bulk actions */
.bulk-form{margin:0}
.bulk-bar{
  display:flex; align-items:center; gap:.5rem 1rem; flex-wrap:wrap;
  padding:.7rem .9rem; margin:0 0 .9rem;
  border-radius:var(--radius); background:var(--surface-2); border:1px solid var(--border);
}
.bulk-bar .bulk-all{display:inline-flex; align-items:center; gap:.45rem; margin:0; cursor:pointer; font-weight:800; font-size:.85rem; color:var(--cream)}
.bulk-bar .bulk-all input{width:1.05rem; height:1.05rem; margin:0; accent-color:var(--copper)}
.bulk-count{font-size:.78rem; color:var(--muted); font-weight:700}

.bulk-actions{display:flex; align-items:center; gap:.55rem; flex-wrap:wrap; margin-inline-start:auto}

/* joined star / normal buttons */
.seg-btn{display:inline-flex; border:1px solid var(--border); border-radius:10px; overflow:hidden}
.seg-btn .btn{border:0; border-radius:0; background:transparent; color:var(--muted)}
.seg-btn .btn:hover{background:rgba(190,114,55,.14); color:var(--cream); transform:none}
.seg-btn .btn + .btn{border-inline-start:1px solid var(--border)}

/* "move to session" group */
.bulk-bar .bulk-move{
  display:inline-flex; align-items:center; gap:.5rem; margin:0;
  padding:.22rem .4rem .22rem .7rem; border:1px solid var(--border); border-radius:10px;
}
.bulk-bar .bulk-move label{font-size:.8rem; font-weight:700; color:var(--muted); margin:0; white-space:nowrap}
.bulk-bar .bulk-move select{width:auto; min-width:6.5rem; margin:0; padding:.28rem .5rem; border-radius:8px; font-size:.82rem}
.bulk-bar .bulk-move .btn{border:0; background:transparent; color:var(--gold)}
.bulk-bar .bulk-move .btn:hover{background:rgba(190,114,55,.14); color:var(--cream); transform:none}

/* destructive */
.bulk-del{font-weight:800}
.ex-item:has(.ex-pick:checked){border-color:var(--copper); box-shadow:0 0 0 1px rgba(190,114,55,.5); background:rgba(190,114,55,.06)}

/* ---------- curriculum: terms, sessions, materials ---------- */
.term-bar{display:flex; align-items:center; gap:.45rem; flex-wrap:wrap; margin:.4rem 0 1.1rem}
.term-pill{
  display:inline-flex; align-items:center; gap:.4rem; cursor:pointer;
  padding:.45rem .95rem; border-radius:50px; border:1px solid var(--border);
  background:var(--surface-2); color:var(--muted); font-weight:700; font-size:.87rem;
  transition:background .15s,color .15s,border-color .15s;
}
.term-pill:hover{border-color:var(--copper); color:var(--cream)}
.term-pill.on{background:var(--grad); color:#2a1710; border-color:transparent; box-shadow:0 4px 14px rgba(190,114,55,.4)}
.term-pill.add{border-style:dashed; color:var(--gold)}
.live-dot{width:7px; height:7px; border-radius:50%; background:#7be0a1; box-shadow:0 0 0 3px rgba(123,224,161,.25)}
.term-actions{display:flex; align-items:center; gap:.45rem; flex-wrap:wrap}
.sess-tools{display:flex; align-items:center; gap:.45rem; flex-wrap:wrap; margin-bottom:.7rem}

/* details-based popovers (term / session / file editors) */
details.term-new{position:relative}
details.term-new>summary{list-style:none; cursor:pointer}
details.term-new>summary::-webkit-details-marker{display:none}
details.term-new[open]>summary{color:var(--cream)}
.popform{
  margin-top:.7rem; padding:.85rem 1rem; border-radius:12px;
  background:var(--surface-3); border:1px solid var(--border);
}
.popform label{font-size:.82rem}

/* session materials */
.files-box{margin:.2rem 0 .9rem; padding:.7rem .85rem; border-radius:12px; background:var(--surface-2); border:1px solid var(--border)}
.files-box h3{margin:0 0 .5rem; font-size:.92rem; color:var(--cream)}
.file-row{display:flex; align-items:center; justify-content:space-between; gap:.6rem; padding:.35rem 0; border-top:1px dashed rgba(238,211,180,.12)}
.file-row:first-of-type{border-top:none}
.file-row a{display:inline-flex; align-items:center; gap:.4rem; color:var(--cream); font-weight:600; min-width:0}
.file-row a:hover{color:var(--gold)}

/* teacher notes */
.note{margin-top:.7rem; padding:.7rem .9rem; border-radius:12px; background:var(--surface-2); border:1px solid var(--border)}
.note p{margin:0; white-space:pre-wrap}
.note-foot{display:flex; align-items:center; justify-content:space-between; gap:.6rem; margin-top:.4rem}

/* student roster */
.stu-row{
  display:flex; align-items:center; justify-content:space-between; gap:.9rem; flex-wrap:wrap;
  padding:.75rem .9rem; border:1px solid var(--border); border-radius:var(--radius);
  margin:.5rem 0; background:var(--surface-2); color:var(--text);
  transition:border-color .15s,background .15s;
}
.stu-row:hover{border-color:var(--border-2); background:var(--surface-3)}
.stu-id{display:flex; align-items:center; gap:.65rem; min-width:0; flex:1 1 auto; color:inherit; text-decoration:none}
.stu-name-wrap{display:flex; flex-direction:column; min-width:0}
.stu-name{font-weight:800; color:var(--cream); font-size:1rem}
.stu-meta{display:flex; align-items:center; gap:.4rem; flex-wrap:wrap}

/* session completion line */
.sess-line{display:flex; align-items:center; justify-content:space-between; gap:1rem; padding:.55rem .2rem; flex-wrap:wrap}

/* ---------- login: password / SMS-code tabs ---------- */
.login-col{width:100%; max-width:440px}
.login-tabs{display:flex; gap:.4rem; margin-bottom:.7rem}
.login-tab{
  flex:1; text-align:center; padding:.55rem .8rem; border-radius:12px; cursor:pointer;
  background:var(--surface-2); border:1px solid var(--border); color:var(--muted);
  font-weight:800; font-size:.9rem; transition:background .15s,color .15s;
}
.login-tab:hover{color:var(--cream)}
.login-tab.on{background:var(--grad); color:#2a1710; border-color:transparent}
.login-secondary{display:flex; gap:.5rem; margin-top:.6rem}
.login-secondary form{flex:1}

/* ---------- sms / phone ---------- */
.sms-credit{font-size:1.4rem; font-weight:800; color:var(--gold)}
.phone-chip{display:inline-flex; align-items:center; gap:.35rem; font-variant-numeric:tabular-nums}
.sms-row{display:flex; align-items:center; justify-content:space-between; gap:.7rem; padding:.5rem .1rem; border-top:1px dashed rgba(238,211,180,.12); flex-wrap:wrap}
.sms-row:first-of-type{border-top:none}
.sms-row .who{display:flex; align-items:center; gap:.45rem; min-width:0; flex-wrap:wrap}

/* ---------- on/off switches (SMS settings) ---------- */
.sw-stack{display:flex; flex-direction:column; gap:.6rem}
.sw{display:flex; align-items:center; gap:.7rem; background:var(--surface-2); border:1px solid var(--border); border-radius:14px; padding:.7rem .9rem; cursor:pointer; position:relative}
.sw input{position:absolute; opacity:0; width:0; height:0}
.sw-track{flex:0 0 auto; width:46px; height:26px; border-radius:999px; background:rgba(238,211,180,.15); border:1px solid var(--border); position:relative; transition:background .18s}
.sw-track::after{content:""; position:absolute; top:2px; right:2px; width:20px; height:20px; border-radius:50%; background:var(--muted); transition:transform .18s, background .18s}
.sw input:checked + .sw-track{background:rgba(143,191,106,.35); border-color:rgba(143,191,106,.6)}
.sw input:checked + .sw-track::after{background:var(--green); transform:translateX(-20px)}
.sw input:focus-visible + .sw-track{outline:2px solid var(--gold); outline-offset:2px}
.sw b{display:block; font-size:.95rem}
.sw .tiny{display:block; margin-top:.1rem}

/* ---------- per-student actions ---------- */
.stu-acts{display:flex; gap:.35rem; flex-wrap:wrap; justify-content:flex-end}
.stu-acts form{margin:0}
.icon-btn{padding:.35rem .55rem; border-radius:10px; background:var(--surface-3); border:1px solid var(--border); color:var(--cream); font-size:.82rem; font-weight:700; cursor:pointer; line-height:1; white-space:nowrap}
.icon-btn:hover{background:rgba(190,114,55,.22); color:var(--gold)}
.icon-btn.ok:hover{background:rgba(143,191,106,.22); color:var(--green)}
.icon-btn.danger:hover{background:rgba(224,112,95,.22); color:#f0907f}
.stu-row.off{opacity:.55}

/* ---------- flash ---------- */
.flash{padding:.75rem 1rem; border-radius:12px; margin:.8rem 0; font-weight:700; display:flex; gap:.5rem; align-items:flex-start}
.flash-ok{background:rgba(143,191,106,.13); color:#a8d27e; border:1px solid rgba(143,191,106,.45)}
.flash-err{background:rgba(224,112,95,.13); color:#f0907f; border:1px solid rgba(224,112,95,.45)}
.flash-info{background:rgba(190,114,55,.14); color:var(--gold); border:1px solid rgba(190,114,55,.45)}

/* ---------- login ---------- */
.login-wrap{max-width:1000px; margin:3vh auto 0; display:grid; grid-template-columns:1fr 1fr; gap:1.4rem; align-items:center}
.login-card{padding:1.8rem 1.7rem}
.login-art{display:grid; place-items:center; text-align:center}
.login-art img{max-width:260px; width:70%; animation:bob 4s ease-in-out infinite; filter:drop-shadow(0 16px 28px rgba(0,0,0,.6))}

/* ---------- hero / landing ---------- */
.hero{
  position:relative; overflow:hidden; border-radius:22px; margin:1rem 0 1.4rem;
  border:1px solid var(--border);
  background:
    radial-gradient(700px 380px at 85% -20%,rgba(190,114,55,.3),transparent 60%),
    radial-gradient(600px 340px at 10% 120%,rgba(171,61,59,.26),transparent 60%),
    linear-gradient(160deg,#1a1525 0%,#241518 40%,#1a1015 100%);
  padding:2.2rem 2rem;
}
.hero::after{
  content:""; position:absolute; top:0; inset-inline:0; height:3px; background:var(--grad); opacity:.8;
}
.hero-grid{display:grid; grid-template-columns:1.35fr 1fr; gap:1.5rem; align-items:center}
.hero h1{font-size:2.5rem; line-height:1.35; margin-bottom:.5rem}
.hero h1 .grad{background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent}
.hero .lead{color:var(--muted); font-size:1.06rem; max-width:52ch}
.hero-cta{display:flex; gap:.7rem; flex-wrap:wrap; margin-top:1.2rem}
.hero-art{display:grid; place-items:center}
.hero-art img{max-width:280px; width:82%; animation:bob 4.5s ease-in-out infinite; filter:drop-shadow(0 18px 30px rgba(0,0,0,.6))}
.hero-logo{height:46px; width:auto; margin-bottom:.7rem}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.fade-up{animation:fadeUp .5s ease both}
@keyframes fadeUp{from{opacity:0; transform:translateY(14px)}to{opacity:1; transform:translateY(0)}}
.stat-strip{display:flex; gap:.6rem; flex-wrap:wrap; margin-top:1.4rem}
.stat-chip{
  background:rgba(26,16,21,.6); border:1px solid var(--border); border-radius:50px;
  padding:.45rem .95rem; display:flex; align-items:center; gap:.5rem; font-size:.9rem; color:var(--muted);
}
.stat-chip b{color:var(--gold); font-size:1.05rem}

/* ---------- news ---------- */
.news-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:1rem}
.news-card{
  position:relative;
  background:linear-gradient(180deg,var(--surface),rgba(36,26,31,.6));
  border:1px solid var(--border); border-radius:var(--radius); padding:1.05rem 1.15rem;
  transition:transform .18s,border-color .2s,box-shadow .25s;
}
.news-card::before{content:""; position:absolute; top:0; inset-inline:14px; height:2px; background:var(--grad); border-radius:2px; opacity:.4}
.news-card:hover{transform:translateY(-3px); border-color:var(--border-2); box-shadow:0 6px 24px rgba(0,0,0,.4),var(--glow)}
.news-card.pinned{border-color:rgba(229,163,100,.5)}
.news-emoji{font-size:1.6rem; line-height:1}
.news-card h3{margin:.45rem 0 .35rem; font-size:1.02rem}
.news-card .body{color:var(--muted); font-size:.92rem; white-space:pre-wrap}
.news-card .date{color:var(--muted-2); font-size:.78rem; margin-top:.6rem}
.pin-tag{position:absolute; top:.7rem; inset-inline-start:.8rem; font-size:.72rem; color:var(--gold)}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto; border-radius:var(--radius); border:1px solid var(--border)}
table{width:100%; border-collapse:collapse; font-size:.93rem; min-width:520px}
th,td{padding:.6rem .7rem; text-align:right; border-bottom:1px solid var(--border); white-space:nowrap}
th{color:var(--gold); font-weight:700; font-size:.83rem; background:var(--surface-2); position:sticky; top:0}
tbody td{color:var(--text)}
tbody tr:hover td{background:rgba(190,114,55,.08)}
tbody tr:last-child td{border-bottom:none}
.stat{font-weight:800}
.stat.ok{color:#a8d27e} .stat.part{color:var(--gold)} .stat.no{color:var(--muted-2)}

/* ---------- code editor ---------- */
.editor-wrap{border:1px solid var(--border); border-radius:14px; overflow:hidden; margin:.7rem 0; background:#1a1015}
.editor-toolbar{
  display:flex; align-items:center; gap:.4rem; flex-wrap:wrap;
  padding:.45rem .6rem; background:var(--surface-2); border-bottom:1px solid var(--border);
}
.editor-toolbar .dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.editor-toolbar .grow{margin-inline-start:auto}
.editor-toolbar button{
  background:var(--surface-3); color:var(--muted); border:1px solid var(--border);
  border-radius:50px; padding:.22rem .7rem; font-family:inherit; font-size:.8rem; cursor:pointer; font-weight:600;
}
.editor-toolbar button:hover{color:var(--gold); border-color:var(--copper)}
.CodeMirror{
  height:auto; min-height:210px; font-family:"JetBrains Mono","Fira Code","Cascadia Code",Consolas,monospace;
  font-size:14px; line-height:1.7; direction:ltr; text-align:left; background:transparent !important;
}
.CodeMirror-gutters{background:#1f1720 !important; border-inline-end:1px solid var(--border) !important}
.CodeMirror-linenumber{color:rgba(238,211,180,.3) !important}
.CodeMirror-cursor{border-inline-start:2px solid var(--gold) !important}
.CodeMirror-activeline-background{background:rgba(190,114,55,.10) !important}
.CodeMirror-matchingbracket{color:var(--gold) !important; font-weight:800; text-decoration:none !important}
.cm-s-monokai.CodeMirror{background:transparent !important}
.cm-s-monokai .CodeMirror-gutters{background:#1f1720 !important; border:none}

.checker{border-radius:12px; margin:.6rem 0; padding:.7rem .9rem; font-size:.9rem; border:1px solid var(--border); background:var(--surface-2)}
.checker.ok{border-color:rgba(143,191,106,.5); background:rgba(143,191,106,.09); color:#a8d27e}
.checker ul{margin:.35rem 0; padding-inline-start:1.2rem}
.checker li{margin:.2rem 0}
.checker .lvl-err{color:#f0907f} .checker .lvl-warn{color:var(--gold)} .checker .lvl-hint{color:#94abd8}

.code-block{background:#1a1015; border:1px solid var(--border); border-radius:12px; padding:.8rem 1rem;
  font-family:"JetBrains Mono",Consolas,monospace; direction:ltr; text-align:left; font-size:.9rem;
  white-space:pre; overflow-x:auto; margin:.6rem 0; color:var(--cream)}
.prompt{background:var(--surface-2); border:1px solid var(--border); border-radius:14px; padding:.95rem 1.1rem; font-size:1.02rem; margin:.8rem 0; color:var(--text)}
.prompt .code-block{margin:.5rem 0}

/* ---------- assets ---------- */
.asset-row{
  display:flex; align-items:center; gap:.9rem; padding:.75rem .3rem;
  border-bottom:1px solid var(--border); flex-wrap:wrap;
}
.asset-row:last-child{border-bottom:none}
.asset-ico{font-size:1.5rem; width:2rem; text-align:center; flex:none}
.asset-name{font-weight:700; flex:1; min-width:150px; word-break:break-all; color:var(--cream)}
.asset-meta{color:var(--muted-2); font-size:.8rem; white-space:nowrap}

/* ---------- misc ---------- */
.back{display:inline-flex; align-items:center; gap:.35rem; color:var(--muted); font-size:.9rem; margin-bottom:.4rem}
.empty{border:1px dashed var(--border-2); border-radius:var(--radius); padding:2rem; text-align:center; color:var(--muted)}
.foot{text-align:center; color:var(--muted); font-size:.85rem; padding:2rem 0 1rem}
.info-table td{color:var(--text); border-color:rgba(238,211,180,.10)}
.info-table td:first-child{color:var(--cream); font-weight:700; white-space:nowrap}
.two-col{display:grid; grid-template-columns:1.6fr 1fr; gap:1.2rem; align-items:start}
/* ---------- teacher / contact ---------- */
.teacher-card{display:flex; gap:1.1rem; align-items:center; flex-wrap:wrap}
.teacher-ph{width:88px;height:88px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-size:2rem;flex:none;color:#2a1710;overflow:hidden;border:2px solid var(--border-2);box-shadow:0 8px 20px rgba(0,0,0,.4)}
.teacher-ph img{width:100%;height:100%;object-fit:cover;object-position:top center}
.teacher-ph.ph-lg{width:124px;height:124px}
.teacher-role{color:var(--gold);font-weight:600;font-size:.85rem;margin-top:.15rem}
.contact-list{display:flex;flex-direction:column;gap:.3rem;margin-top:.5rem}
.contact-list .row{display:flex;align-items:center;gap:.4rem}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:.9rem}
.gallery figure{margin:0;background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:transform .18s,border-color .2s}
.gallery figure:hover{transform:translateY(-3px);border-color:var(--border-2)}
.gallery img{width:100%;display:block;aspect-ratio:16/10;object-fit:cover;object-position:top}
.gallery figcaption{padding:.5rem .75rem;font-size:.85rem;color:var(--muted)}

/* ---------- decorative ground strip ---------- */
.ground-strip{position:relative;height:150px;margin:1.6rem 0;border-radius:16px;overflow:hidden;border:1px solid var(--border);
  background:linear-gradient(180deg,transparent 50%,rgba(190,114,55,.10))}
.ground-strip .gs-ground{position:absolute;bottom:0;inset-inline:0;height:28px;background:linear-gradient(180deg,#3a2a30,#241a1f);border-top:1px solid var(--border-2)}
.ground-strip .gs-char{position:absolute;bottom:20px;inset-inline-start:12%;height:104px;animation:bob 2.6s ease-in-out infinite;filter:drop-shadow(0 8px 14px rgba(0,0,0,.5))}
.ground-strip .gs-ctrl{position:absolute;bottom:38px;inset-inline-end:6%;height:66px;opacity:.5}
.ground-strip .gs-logo{position:absolute;top:16px;inset-inline-end:12%;height:30px;opacity:.75}
.ground-strip .gs-cap{position:absolute;top:16px;inset-inline-start:16px;color:var(--muted);font-size:.9rem}

/* ---------- about page ---------- */
.about-hero{padding:2.1rem 1.7rem;border-radius:20px;border:1px solid var(--border);margin-bottom:1.2rem;
  background:radial-gradient(600px 300px at 85% -20%,rgba(190,114,55,.3),transparent 60%),
             radial-gradient(500px 260px at 5% 120%,rgba(171,61,59,.24),transparent 60%),
             linear-gradient(160deg,#1a1525,#1a1015)}
/* the about hero with the course logo snapped to the LEFT edge of the div */
.about-hero.top{display:flex; align-items:center; gap:1.2rem; overflow:hidden; padding:0 1.7rem 0 0}
.about-hero.top .about-hero-text{flex:1; min-width:0; padding:1.7rem 0}
.about-hero.top .hero-logo{height:174px; width:auto; flex:none; margin:0}
@media(max-width:820px){
  .about-hero.top{flex-direction:column-reverse; gap:.6rem; padding:1.5rem 1.1rem; text-align:center}
  .about-hero.top .about-hero-text{padding:0}
  .about-hero.top .hero-logo{height:118px}
}
.feature-list{list-style:none;padding:0;margin:.6rem 0}
.feature-list li{padding:.5rem 0;border-bottom:1px dashed rgba(238,211,180,.13);display:flex;gap:.6rem;align-items:flex-start}
.feature-list li:last-child{border-bottom:none}
.chip-logo{height:20px;width:auto;vertical-align:middle;margin-inline-end:.35rem}
.info-table{width:100%;border-collapse:collapse;font-size:.93rem;min-width:0}
.info-table td{padding:.55rem .4rem;border-bottom:1px solid var(--border);white-space:normal}
.info-table td:first-child{color:var(--muted);width:38%}

@media(max-width:820px){
  .hero-grid,.login-wrap,.two-col{grid-template-columns:1fr}
  .hero h1{font-size:1.9rem}
  .hero-art,.login-art{order:-1}
  .hero-art img,.login-art img{max-width:180px}
  body{font-size:15px}
  .topbar{grid-template-columns:1fr 1fr; row-gap:.3rem; padding:.2rem .5rem .2rem 0}
  .topbar .user{grid-column:1; grid-row:1; justify-self:start; min-width:0; overflow:hidden}
  .topbar .user > span:not(.avatar){max-width:92px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
  .topbar .brand{grid-column:2; grid-row:1; justify-self:end}
  .topbar .brand img{height:46px}
  .topbar nav{grid-column:1 / -1; grid-row:2; width:100%; overflow-x:auto; flex-wrap:nowrap; justify-self:stretch; justify-content:flex-start; padding-bottom:.2rem; scrollbar-width:thin}
  .topbar nav a{flex:none; white-space:nowrap}
}
@media print{
  body{background:#fff; color:#000}
  .topbar,.btn,.foot,.hero-cta{display:none}
  .card,.news-card{border-color:#ccc; box-shadow:none; background:#fff}
}

/* ---------- interactive terminal ---------- */
.btn-run{background:var(--green,#34d399) !important; color:#06251a !important; font-weight:800; border:0 !important}
.btn-run:hover{filter:brightness(1.09)}
.term{margin:.65rem 0;border:1px solid #2a2f3a;border-radius:12px;overflow:hidden;background:#0b0f16}
.term-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.4rem .75rem;
  background:#161b22;border-bottom:1px solid #2a2f3a}
.term-title{font-size:.82rem;color:#9fb0c8;font-weight:700}
.term-status{font-size:.72rem;padding:.12rem .55rem;border-radius:999px;background:#26303f;color:#9fb0c8;white-space:nowrap}
.term-status.ok{background:rgba(52,211,153,.18);color:#6ee7b7}
.term-status.err{background:rgba(248,113,113,.18);color:#fca5a5}
.term-body{margin:0;padding:.75rem .95rem;min-height:78px;max-height:280px;overflow:auto;
  font-family:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;font-size:.87rem;line-height:1.55;
  color:#d7e2f2;white-space:pre-wrap;word-break:break-word;direction:ltr;text-align:left}

/* ---------- teacher: import + export ---------- */
.tool-row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin:.6rem 0}
.import-box{background:var(--surface-2);border:1px solid var(--border);border-radius:14px;padding:.9rem 1rem;margin:.8rem 0}
.import-box textarea{width:100%;min-height:130px;font-family:"JetBrains Mono",Consolas,monospace;direction:ltr;text-align:left;font-size:.82rem}
.import-box .muted{margin:.4rem 0 0}
.import-problems{background:rgba(248,113,113,.10);border:1px solid rgba(248,113,113,.35);border-radius:12px;padding:.6rem .9rem;margin:.5rem 0;font-size:.88rem}
.import-problems li{margin:.15rem 0}

/* ---------- breadcrumbs ---------- */
.crumbs{display:flex;align-items:center;flex-wrap:wrap;gap:.35rem;font-size:.86rem;color:var(--muted);margin:.2rem 0 .7rem}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--cream)}
.crumbs .sep{opacity:.5}
.crumbs .now{color:var(--cream);font-weight:700}

/* ---------- prev/next exercise navigation ---------- */
.ex-nav{display:flex;align-items:center;justify-content:space-between;gap:.6rem;flex-wrap:wrap;margin:.7rem 0}
.ex-nav .ex-count{color:var(--muted);font-size:.86rem;font-weight:700}
.ex-nav .is-disabled{opacity:.32;pointer-events:none}

/* ---------- stars ---------- */
.ex-stars{color:var(--gold);font-size:.95rem;letter-spacing:.06em;white-space:nowrap;margin-inline-end:.45rem}
.stars-big{display:flex;align-items:center;gap:.25rem;flex-wrap:wrap;margin:.3rem 0 .7rem;font-size:1.7rem;line-height:1}
.stars-big .on{color:var(--gold);text-shadow:0 0 12px rgba(229,163,100,.5)}
.stars-big .off{color:rgba(238,211,180,.22)}
.stars-big .stars-label{font-size:.85rem;color:var(--muted);margin-inline-start:.5rem}
.stars-inline{font-size:1.1rem;letter-spacing:.08em;margin-inline-start:.45rem}
.stars-inline .on{color:var(--gold)} .stars-inline .off{color:rgba(238,211,180,.3)}

/* ---------- star guide ---------- */
.star-guide{list-style:none;margin:.2rem 0 0;padding:0;display:flex;flex-direction:column;gap:.42rem}
.star-guide li{display:flex;align-items:center;gap:.65rem;font-size:.92rem}
.star-guide .sg-stars{min-width:3.7rem;color:var(--gold);font-weight:800;letter-spacing:.06em;white-space:nowrap}
.star-tip{margin:.1rem .1rem .8rem}

/* ---------- «!» help dropdown ---------- */
.help-menu{position:relative;display:inline-flex;align-items:center}
.help-btn{
  width:28px;height:28px;border-radius:50%;border:1.5px solid var(--gold);background:transparent;
  color:var(--gold);font:800 .95rem/1 Vazirmatn,Tahoma,sans-serif;cursor:pointer;
  display:grid;place-items:center;padding:0;flex:none;transition:background .15s;
}
.help-btn:hover{background:rgba(229,163,100,.16)}
.help-btn[aria-expanded="true"]{background:rgba(229,163,100,.24)}
.help-drop{
  position:absolute;top:calc(100% + .55rem);inset-inline-start:0;z-index:60;
  width:min(330px,86vw);background:var(--surface-2);border:1px solid rgba(229,163,100,.35);
  border-radius:14px;padding:.85rem 1rem;box-shadow:0 16px 44px rgba(0,0,0,.5);text-align:start;
}
.help-drop[hidden]{display:none}
.help-drop h3{margin:0 0 .55rem;font-size:.95rem;color:var(--cream)}
.help-drop .star-guide li{font-size:.85rem}
.help-drop .star-guide .sg-stars{min-width:3.3rem;font-size:.9rem}

/* ---------- accordions (per-session dropdowns) ---------- */
.acc{
  border:1px solid var(--border); border-radius:var(--radius); margin:1rem 0;
  background:linear-gradient(180deg,var(--surface),rgba(36,26,31,.65)); box-shadow:var(--shadow); overflow:hidden;
}
.acc>summary{
  list-style:none; cursor:pointer; padding:.95rem 1.2rem;
  display:flex; align-items:center; justify-content:space-between; gap:.8rem; flex-wrap:wrap; transition:background .15s;
}
.acc>summary::-webkit-details-marker{display:none}
.acc>summary:hover{background:rgba(190,114,55,.07)}
.acc-title{font-size:1.12rem; font-weight:800; color:var(--cream); display:flex; align-items:center; gap:.5rem}
.acc-title::before{content:"▸"; color:var(--copper); transition:transform .2s; display:inline-block}
.acc[open] .acc-title::before{transform:rotate(90deg)}
.acc-body{padding:1rem 1.2rem 1.1rem; border-top:1px solid var(--border)}
.acc-stats{display:flex;align-items:center;gap:.4rem;flex-wrap:wrap;justify-content:flex-end}
.acc-stats .chip{font-size:.8rem}

/* ---------- teacher: editable exercise rows ---------- */
.ex-item{
  border:1px solid var(--border); border-radius:var(--radius); margin:.6rem 0;
  background:var(--surface-2); overflow:hidden;
  transition:border-color .15s,background .15s,box-shadow .2s;
}
.ex-item:hover{border-color:var(--border-2); background:var(--surface-3)}
.ex-item[open]{background:var(--surface-2)}

.ex-item>summary{
  list-style:none; cursor:pointer;
  display:grid; grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center; column-gap:.85rem; row-gap:.55rem;
  padding:1rem 1.1rem;
}
.ex-item>summary::-webkit-details-marker{display:none}
.ex-item>summary:hover{background:rgba(190,114,55,.08)}
.ex-item[open]>summary{border-bottom:1px solid var(--border)}

/* title block */
.ex-item-sum .ex-title{grid-column:2; display:flex; align-items:center; gap:.6rem; min-width:0}
.ex-item-sum .ex-num{
  flex:none; width:1.7rem; height:1.7rem; display:grid; place-items:center;
  border-radius:9px; background:var(--surface-3); color:var(--gold);
  font-size:.78rem; font-weight:800; border:1px solid var(--border);
}
.ex-item-sum .ex-name{font-size:1.03rem; font-weight:800; color:var(--cream); letter-spacing:.01em}

/* metadata badges — lighter than the card so they pop, one consistent radius */
.ex-item-sum .ex-item-meta{grid-column:3; justify-self:end; display:flex; align-items:center; gap:.4rem; flex-wrap:wrap}
.ex-item-sum .ex-item-meta .chip{
  background:var(--surface-3); border-color:rgba(238,211,180,.16); color:var(--cream);
  border-radius:50px; font-weight:700; font-size:.76rem; padding:.16rem .7rem;
}
.ex-item-sum .ex-item-meta .chip.chip-accent{background:rgba(190,114,55,.16); border-color:rgba(229,163,100,.42); color:var(--gold)}

/* edit caret — quiet grey until you hover the row */
.ex-item-sum .ex-item-caret{
  grid-column:4; justify-self:end; align-self:center;
  font-size:.82rem; opacity:.4; filter:grayscale(1);
  transition:opacity .15s,filter .15s,transform .2s;
}
.ex-item:hover .ex-item-caret{opacity:.75; filter:grayscale(.35)}
.ex-item>summary:hover .ex-item-caret{opacity:1; filter:grayscale(0); transform:rotate(-14deg)}
.ex-item[open] .ex-item-caret{opacity:1; filter:grayscale(0); transform:rotate(-14deg)}

/* checkbox — vertically centered in the row */
.ex-item-sum .ex-pick{
  grid-column:1; align-self:center; flex:none; width:1.05rem; height:1.05rem;
  margin:0; accent-color:var(--copper); cursor:pointer;
}
.ex-item-body{padding:1rem 1.1rem 1.1rem}

@media (max-width:680px){
  .ex-item>summary{grid-template-columns:auto minmax(0,1fr) auto}
  .ex-item-sum .ex-pick{grid-column:1; grid-row:1}
  .ex-item-sum .ex-title{grid-column:2; grid-row:1}
  .ex-item-sum .ex-item-caret{grid-column:3; grid-row:1}
  .ex-item-sum .ex-item-meta{grid-column:2 / 4; grid-row:2; justify-self:start}
}