/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root{
  --ink:#14121f;
  --ink-soft:#4b4766;
  --paper:#f8f7fd;
  --card:#ffffff;
  --line:#e7e4f5;

  --brand:#6d5ef7;
  --brand-dark:#4d3fd6;
  --teal:#0ec8a4;
  --coral:#ff7a59;

  --dawn:#ff9f43;      --dawn-bg:#fff6ec;
  --morning:#3d94e6;   --morning-bg:#eef6ff;
  --noon:#6d5ef7;      --noon-bg:#f0eeff;
  --afternoon:#ff7a59; --afternoon-bg:#fff1ec;
  --evening:#8b5cf6;   --evening-bg:#f5eeff;
  --night:#a78bfa;     --night-bg:#18172a;

  --font-display:'Baloo Da 2','Hind Siliguri',sans-serif;
  --font-body:'Hind Siliguri','Baloo Da 2',sans-serif;
  --font-code:'Fira Code',monospace;

  --r-lg:26px;
  --r-md:16px;
  --shadow-card:0 1px 2px rgba(20,15,50,0.04), 0 12px 28px rgba(30,20,70,0.08);
  --shadow-card-hover:0 1px 2px rgba(20,15,50,0.06), 0 20px 40px rgba(30,20,70,0.14);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  min-height:100vh;
  overflow-x:hidden;
}
::selection{ background:var(--brand); color:#fff; }
code{ font-family:var(--font-code); background:rgba(109,94,247,0.09); padding:1px 6px; border-radius:6px; font-size:0.92em; color:var(--brand-dark); }

/* ============================================================
   TOP BAR: slim progress + nav
   ============================================================ */
#daybar{
  position:fixed; top:0; left:0; right:0; height:3px; z-index:2000;
  background:var(--line);
}
#daybar-fill{
  height:100%; width:0%;
  background:linear-gradient(90deg,var(--dawn),var(--brand),var(--evening));
  transition:width .12s linear;
}
#day-marker{
  position:fixed; top:14px; left:0%; z-index:2001;
  font-size:1.15rem; transform:translateX(-50%);
  transition:left .12s linear;
  filter:drop-shadow(0 2px 5px rgba(20,15,50,0.25));
  pointer-events:none;
}

#toc-toggle{
  position:fixed; top:18px; right:18px; z-index:2100;
  width:50px; height:50px; border-radius:16px;
  background:var(--ink); color:#fff; border:none;
  font-size:1.2rem; cursor:pointer;
  box-shadow:var(--shadow-card);
  display:flex; align-items:center; justify-content:center;
  transition:transform .15s ease, background .15s ease;
}
#toc-toggle:hover{ background:var(--brand); transform:translateY(-1px); }

#toc-drawer{
  position:fixed; top:0; right:-340px; width:308px; height:100%;
  background:var(--card); z-index:2050;
  box-shadow:-16px 0 50px rgba(20,15,50,0.18);
  padding:34px 22px 24px;
  overflow-y:auto;
  transition:right .32s cubic-bezier(.2,.8,.2,1);
}
#toc-drawer.open{ right:0; }
#toc-drawer h3{
  font-family:var(--font-display);
  color:var(--ink);
  margin:0 0 18px;
  font-size:1.15rem;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
#toc-drawer ol{
  list-style:none;
  margin:0; padding:0;
  display:flex; flex-direction:column;
  gap:3px;
}
#toc-drawer a{
  display:flex; align-items:center; gap:12px;
  text-decoration:none;
  color:var(--ink-soft);
  font-weight:600;
  padding:9px 10px;
  border-radius:12px;
  font-size:0.93rem;
  transition:background .15s, color .15s;
}
#toc-drawer a:hover{ background:var(--noon-bg); color:var(--brand-dark); }
#toc-drawer .toc-time{
  font-family:var(--font-code);
  font-size:0.68rem;
  color:#fff;
  background:var(--brand);
  min-width:40px;
  text-align:center;
  padding:3px 6px;
  border-radius:7px;
  flex-shrink:0;
}
#toc-overlay{
  position:fixed; inset:0; background:rgba(20,15,50,0.32);
  backdrop-filter:blur(2px);
  z-index:2040; display:none;
}
#toc-overlay.show{ display:block; }

/* ============================================================
   HERO
   ============================================================ */
header{
  position:relative;
  padding:88px 24px 64px;
  text-align:center;
  background:
    radial-gradient(60% 50% at 15% 0%, rgba(109,94,247,0.10), transparent),
    radial-gradient(50% 40% at 90% 10%, rgba(255,159,67,0.12), transparent);
  overflow:hidden;
}
header .eyebrow{
  display:inline-block;
  font-family:var(--font-code);
  font-weight:600;
  letter-spacing:1.5px;
  color:var(--brand-dark);
  font-size:0.78rem;
  text-transform:uppercase;
  background:var(--noon-bg);
  border:1px solid rgba(109,94,247,0.18);
  padding:6px 16px;
  border-radius:100px;
}
header h1{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(2rem, 5.4vw, 3.4rem);
  color:var(--ink);
  margin:20px 0 10px;
  line-height:1.2;
}
header p.sub{
  font-size:clamp(1rem,2vw,1.2rem);
  font-weight:500;
  color:var(--ink-soft);
  max-width:600px;
  margin:0 auto;
  line-height:1.7;
}
header .mascots{
  margin-top:26px;
  display:flex;
  gap:14px;
  justify-content:center;
}
header .mascots span{
  width:52px; height:52px;
  display:flex; align-items:center; justify-content:center;
  font-size:1.5rem;
  background:var(--card);
  border-radius:16px;
  box-shadow:var(--shadow-card);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container{
  max-width:1160px;
  margin:0 auto;
  padding:8px 20px 70px;
}

.chapter{
  scroll-margin-top:26px;
  border-radius:var(--r-lg);
  padding:0;
  margin-bottom:28px;
  background:var(--card);
  border:1px solid var(--line);
  box-shadow:var(--shadow-card);
  position:relative;
  overflow:hidden;
  transition:box-shadow .2s ease;
}
.chapter:hover{ box-shadow:var(--shadow-card-hover); }

.chapter-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);
  grid-template-areas:"content code";
  gap:28px;
  align-items:start;
  padding:32px 36px 36px;
}
.chapter-grid > .story{ grid-area:content; min-width:0; }
.chapter-grid > .code-panel{ grid-area:code; min-width:0; align-self:start; }

.story{ padding-top:4px; }
.story .badge{
  display:inline-flex;
  vertical-align:middle;
  margin-right:10px;
  margin-bottom:14px;
}
.story .illustration{
  display:inline-flex;
  align-items:center; justify-content:center;
  vertical-align:middle;
  width:40px; height:40px;
  border-radius:12px;
  font-size:1.35rem;
  background:var(--noon-bg);
  margin-bottom:14px;
}

.story h2{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.5rem;
  color:var(--ink);
  margin:6px 0 14px;
  line-height:1.35;
}
.story p{
  font-size:1.03rem;
  line-height:1.85;
  color:var(--ink-soft);
  margin:0 0 14px;
}

.learn-box{
  background:var(--noon-bg);
  border:1px solid rgba(109,94,247,0.14);
  border-radius:var(--r-md);
  padding:16px 20px;
  margin-top:14px;
}
.learn-box b{
  font-family:var(--font-display);
  color:var(--brand-dark);
  font-size:0.95rem;
}
.learn-box ul{
  margin:10px 0 0;
  padding-left:20px;
}
.learn-box li{
  font-size:0.94rem;
  color:var(--ink-soft);
  margin-bottom:5px;
}

.speech{
  background:var(--paper);
  border:1px solid var(--line);
  border-left:3px solid var(--brand);
  border-radius:0 var(--r-md) var(--r-md) 0;
  padding:12px 18px;
  font-size:0.98rem;
  color:var(--ink-soft);
  margin:14px 0;
}
.speech b{ color:var(--ink); }

/* Per-chapter tint: subtle top accent bar + icon tint, keeps card white for readability */
.chapter[data-tint="dawn"] .story .illustration{ background:var(--dawn-bg); }
.chapter[data-tint="dawn"]{ border-top:4px solid var(--dawn); }
.chapter[data-tint="morning"] .story .illustration{ background:var(--morning-bg); }
.chapter[data-tint="morning"]{ border-top:4px solid var(--morning); }
.chapter[data-tint="noon"] .story .illustration{ background:var(--noon-bg); }
.chapter[data-tint="noon"]{ border-top:4px solid var(--noon); }
.chapter[data-tint="afternoon"] .story .illustration{ background:var(--afternoon-bg); }
.chapter[data-tint="afternoon"]{ border-top:4px solid var(--afternoon); }
.chapter[data-tint="evening"] .story .illustration{ background:var(--evening-bg); }
.chapter[data-tint="evening"]{ border-top:4px solid var(--evening); }
.chapter[data-tint="night"]{ border-top:4px solid var(--night); background:#1c1a2e; }
.chapter[data-tint="night"] .story .illustration{ background:rgba(167,139,250,0.16); }
.chapter[data-tint="night"] .story h2{ color:#f1edff; }
.chapter[data-tint="night"] .story p{ color:#c9c3e6; }
.chapter[data-tint="night"] .learn-box{ background:rgba(167,139,250,0.10); border-color:rgba(167,139,250,0.2); }
.chapter[data-tint="night"] .learn-box b{ color:#c9beff; }
.chapter[data-tint="night"] .learn-box li{ color:#c9c3e6; }
.chapter[data-tint="night"] .speech{ background:rgba(255,255,255,0.04); border-color:rgba(167,139,250,0.2); }
.chapter[data-tint="night"] .speech b{ color:#f1edff; }
.chapter[data-tint="night"] .speech{ color:#c9c3e6; }
.chapter[data-tint="night"] .badge{ background:rgba(167,139,250,0.18); color:#e4defd; }

.badge{
  display:inline-block;
  background:var(--ink); color:#fff;
  font-family:var(--font-code);
  font-size:0.68rem;
  font-weight:600;
  letter-spacing:0.4px;
  padding:4px 12px;
  border-radius:100px;
  text-transform:uppercase;
}

/* ============================================================
   CODE EDITOR PANEL (modern IDE look)
   ============================================================ */
.code-panel{
  background:#1e1e2e;
  border-radius:var(--r-md);
  overflow-x:auto;
  overflow-y:auto;
  display:flex;
  flex-direction:column;
  box-shadow:0 10px 30px rgba(20,15,50,0.18);
  height: 700px;
}
.code-panel-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:11px 16px;
  background:#181725;
  border-bottom:1px solid rgba(255,255,255,0.06);
}
.code-panel-header .dots{ display:flex; gap:6px; }
.code-panel-header .dots span{
  width:10px; height:10px; border-radius:50%; display:inline-block; opacity:0.85;
}
.dots span:nth-child(1){ background:#ff5f56; }
.dots span:nth-child(2){ background:#ffbd2e; }
.dots span:nth-child(3){ background:#27c93f; }
.code-panel-header .filename{
  font-family:var(--font-code);
  color:#8b87a8;
  font-size:0.78rem;
  display:flex; align-items:center; gap:8px;
}
.code-panel-header .filename .lang-pill{
  background:rgba(109,94,247,0.22); color:#b9aeff;
  font-size:0.65rem; padding:2px 8px; border-radius:6px; font-weight:700;
}

.CodeMirror{
  font-family:var(--font-code) !important;
  font-size:0.9rem;
  height:auto;
  min-height:140px;
  background:transparent !important;
  padding:8px 0;
}
.cm-s-dayincode.CodeMirror{ background:#1e1e2e; color:#e4e2f5; }
.cm-s-dayincode .CodeMirror-gutters{ background:#1e1e2e; border-right:1px solid rgba(255,255,255,0.05); }
.cm-s-dayincode .CodeMirror-linenumber{ color:#4d4a68; }
.cm-s-dayincode .cm-keyword{ color:#ff8fab; font-weight:600; }
.cm-s-dayincode .cm-def{ color:#7dc4ff; font-weight:600; }
.cm-s-dayincode .cm-variable{ color:#e4e2f5; }
.cm-s-dayincode .cm-variable-2{ color:#6ee7b7; }
.cm-s-dayincode .cm-string{ color:#ffcb77; }
.cm-s-dayincode .cm-comment{ color:#5f5c7d; font-style:italic; }
.cm-s-dayincode .cm-number{ color:#d9a4ff; }
.cm-s-dayincode .cm-meta{ color:#b9aeff; font-weight:600; }
.cm-s-dayincode .cm-operator{ color:#0ec8a4; }
.cm-s-dayincode .cm-atom{ color:#6ee7b7; }
.cm-s-dayincode .CodeMirror-cursor{ border-left:2px solid var(--dawn); }

.stdin-row{
  display:flex; align-items:center; gap:10px;
  padding:10px 16px; background:#181725;
  border-top:1px solid rgba(255,255,255,0.05);
}
.stdin-row label{
  font-family:var(--font-code); color:#8b87a8; font-size:0.75rem; white-space:nowrap;
}
.stdin-row input{
  flex:1;
  background:#131220; color:#ffcb77; border:1px solid rgba(255,255,255,0.08);
  border-radius:8px; padding:7px 10px; font-family:var(--font-code); font-size:0.83rem;
  outline:none;
}
.stdin-row input:focus{ border-color:var(--brand); }

.controls-row{
  display:flex; gap:10px; padding:13px 16px;
  background:#1e1e2e;
  border-top:1px solid rgba(255,255,255,0.05);
}
.btn{
  font-family:var(--font-body);
  font-weight:700;
  border:none;
  cursor:pointer;
  border-radius:11px;
  padding:10px 20px;
  font-size:0.95rem;
  transition:transform .12s ease, box-shadow .12s ease, opacity .12s ease;
}
.btn:hover{ transform:translateY(-1px); }
.btn:active{ transform:translateY(0); }
.btn-run{
  background:var(--teal); color:#04231c;
  box-shadow:0 4px 14px rgba(14,200,164,0.35);
}
.btn-run:hover{ box-shadow:0 6px 18px rgba(14,200,164,0.45); }
.btn-reset{
  background:rgba(255,255,255,0.06); color:#c9c3e6;
  border:1px solid rgba(255,255,255,0.1);
}
.btn-reset:hover{ background:rgba(255,255,255,0.1); }

.output-console{
  margin:0 16px 16px;
  background:#131220;
  border:1px solid rgba(255,255,255,0.06);
  border-radius:12px;
  padding:13px 16px;
  font-family:var(--font-code);
  font-size:0.83rem;
  color:#6ee7b7;
  white-space:pre-wrap;
  word-break:break-word;
  min-height:30px;
  max-height:240px;
  overflow-y:auto;
}
.output-console:empty::before{
  content:"▶ 'কোড রান করো' চাপলে এখানে আউটপুট দেখাবে";
  color:#5f5c7d;
}
.output-console.error{ color:#ff8fab; }

/* ============================================================
   FINALE
   ============================================================ */
#finale{
  text-align:center;
  background:linear-gradient(165deg,#221f3d,#171527);
  color:#fff;
  border-radius:var(--r-lg);
  padding:64px 32px;
  position:relative;
  overflow:hidden;
  border:1px solid rgba(167,139,250,0.2);
}
#finale .illustration{
  font-size:2.6rem;
  margin-bottom:6px;
}
#finale h2{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.6rem,4.4vw,2.4rem);
  color:#fff;
  margin-bottom:14px;
}
#finale p{ font-size:1.08rem; max-width:600px; margin:0 auto 30px; line-height:1.85; color:#cfc9ea; }
.certificate{
  background:#fff; color:var(--ink);
  max-width:460px; margin:0 auto 30px;
  border-radius:var(--r-lg); padding:34px;
  border:2px solid var(--dawn);
  font-family:var(--font-display);
  box-shadow:0 20px 50px rgba(0,0,0,0.35);
}
.certificate .cert-title{ font-size:1.5rem; margin-bottom:8px; }
.certificate .cert-name{ font-size:1.9rem; color:var(--coral); margin:12px 0; }
.certificate .cert-sub{ font-family:var(--font-body); font-size:0.92rem; color:var(--ink-soft); }
#confetti-wrap{ position:absolute; inset:0; pointer-events:none; overflow:hidden; }
.confetti{
  position:absolute; top:-20px; font-size:1.3rem;
  animation:fall linear infinite;
}
@keyframes fall{
  to{ transform:translateY(650px) rotate(360deg); opacity:0.2; }
}

footer{
  text-align:center;
  padding:32px 20px;
  color:var(--ink-soft);
  font-size:0.9rem;
  font-weight:500;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:640px){
  .chapter-grid{
    grid-template-columns: 1fr;
    grid-template-areas: "content" "code";
    padding:16px 18px 22px;
    gap:16px;
  }
  .chapter-grid > .story{ margin-bottom:4px; }
  header{ padding:76px 20px 44px; }
}
@media(max-width:480px){
  .controls-row{ flex-wrap:wrap; }
  .btn{ flex:1; text-align:center; }
  header h1{ font-size:1.7rem; }
  header .mascots span{ width:44px; height:44px; font-size:1.25rem; }
}