/* =========================================================
   প্রদীপ (Prodeep) — Design System
   Concept: knowledge as light. A lamp glows against deep
   teal night; cyan is the ambient light, gold is the flame.
   ========================================================= */

:root{
  /* --- Color tokens --- */
  --bg-deep:      #052A31;   /* night teal — header/footer/hero */
  --bg-deep-2:    #08424C;   /* lighter panel within dark sections */
  --paper:        #FBF7EE;   /* warm paper — reading surfaces */
  --paper-2:      #F2EBD8;   /* slightly deeper paper for cards */
  --cyan:         #22C7DE;   /* ambient light — links, icons */
  --cyan-soft:    #7FE0EC;   /* pale cyan for text-on-dark accents */
  --cyan-deep:    #0E6E7C;   /* borders / mid tone */
  --gold:         #EFC24B;   /* the flame — primary accent */
  --gold-deep:    #C99A2E;   /* pressed / border gold */
  --gold-glow:    #FBE7A8;   /* hottest point of the flame glow */
  --ink:          #0B2226;   /* body text on paper */
  --ink-soft:     #3E5A5E;   /* secondary text on paper */
  --text-light:   #EAF6F6;   /* body text on dark */
  --text-muted:   #9FC4C6;   /* secondary text on dark */
  --line:         rgba(11,34,38,0.10);
  --line-dark:    rgba(234,246,246,0.14);

  /* --- Type --- */
  --font-display: 'Baloo Da 2', 'Hind Siliguri', sans-serif;
  --font-body:    'Hind Siliguri', 'Noto Sans Bengali', sans-serif;
  --font-accent:  'Tiro Bangla', serif;

  /* --- Rhythm --- */
  --radius-s: 10px;
  --radius-m: 18px;
  --radius-l: 28px;
  --container: 1120px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  margin:0 0 0.5em;
  line-height:1.25;
  letter-spacing:0.2px;
}
p{ margin:0 0 1.1em; }
.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-accent);
  font-style:italic;
  font-size:15px;
  letter-spacing:0.3px;
  color:var(--gold);
}
.eyebrow::before{
  content:"";
  width:22px; height:1.5px;
  background:var(--gold);
  display:inline-block;
}

/* ---------------- Buttons ---------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 28px;
  border-radius:999px;
  font-family:var(--font-display);
  font-weight:600;
  font-size:16px;
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn:active{ transform:translateY(1px); }
.btn-gold{
  background:linear-gradient(180deg, var(--gold-glow), var(--gold) 60%, var(--gold-deep));
  color:#241A03;
  box-shadow:0 8px 20px -8px rgba(239,194,75,0.65);
}
.btn-gold:hover{ box-shadow:0 10px 26px -8px rgba(239,194,75,0.85); transform:translateY(-1px); }
.btn-outline{
  background:transparent;
  border-color:var(--line-dark);
  color:var(--text-light);
}
.btn-outline:hover{ border-color:var(--cyan); color:var(--cyan-soft); }
.btn-outline-light{
  background:transparent;
  border-color:var(--cyan-deep);
  color:var(--ink);
}
.btn-outline-light:hover{ border-color:var(--gold-deep); color:var(--gold-deep); }

/* ---------------- Header ---------------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(5,42,49,0.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  height:76px;
}
.logo{
  display:flex; align-items:center; gap:10px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:22px;
  color:var(--text-light);
}
.logo .lamp-mark{ width:34px; height:34px; }
.logo span.brand-sub{
  display:block;
  font-family:var(--font-accent);
  font-style:italic;
  font-weight:400;
  font-size:11.5px;
  color:var(--cyan-soft);
  letter-spacing:0.4px;
}
nav.main-nav{ display:flex; align-items:center; gap:28px; }
nav.main-nav a{
  font-size:15.5px;
  color:var(--text-muted);
  padding:6px 2px;
  border-bottom:2px solid transparent;
  transition:color .15s ease, border-color .15s ease;
}
nav.main-nav a:hover, nav.main-nav a.active{
  color:var(--gold);
  border-color:var(--gold);
}
.header-actions{ display:flex; align-items:center; gap:14px; }
.nav-toggle{ display:none; }

@media (max-width:860px){
  nav.main-nav{
    position:fixed; inset:76px 0 0 0;
    background:var(--bg-deep);
    flex-direction:column;
    padding:28px 24px;
    gap:22px;
    transform:translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition:opacity .2s ease, transform .2s ease;
  }
  nav.main-nav.open{ opacity:1; transform:translateY(0); pointer-events:auto; }
  .nav-toggle{
    display:inline-flex; flex-direction:column; gap:5px;
    background:none; border:none; cursor:pointer; padding:8px;
  }
  .nav-toggle span{ width:22px; height:2px; background:var(--text-light); border-radius:2px; }
  .header-actions .btn{ padding:10px 18px; font-size:14px; }
}

/* ---------------- Hero (dark, homepage) ---------------- */
.hero{
  position:relative;
  overflow:hidden;
  background:
    radial-gradient(ellipse 620px 480px at 82% 18%, rgba(239,194,75,0.16), transparent 60%),
    radial-gradient(ellipse 800px 600px at 10% 90%, rgba(34,199,222,0.12), transparent 60%),
    linear-gradient(160deg, var(--bg-deep) 0%, #031A1F 100%);
  color:var(--text-light);
  padding:88px 0 100px;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.05fr 0.95fr;
  gap:56px;
  align-items:center;
}
.hero h1{
  font-size:clamp(34px, 4.4vw, 54px);
  color:var(--text-light);
  margin:14px 0 20px;
}
.hero h1 em{
  font-style:normal;
  color:var(--gold);
  background:linear-gradient(180deg, var(--gold-glow), var(--gold));
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}
.hero p.lead{
  font-size:18px;
  color:var(--text-muted);
  max-width:520px;
  margin-bottom:32px;
}
.hero-cta{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:52px; }

.stat-row{
  display:flex; gap:40px; flex-wrap:wrap;
  border-top:1px solid var(--line-dark);
  padding-top:28px;
}
.stat-row .stat b{
  display:block;
  font-family:var(--font-display);
  font-size:30px;
  color:var(--gold);
}
.stat-row .stat span{
  font-size:14px;
  color:var(--text-muted);
}

/* --- Lamp illustration --- */
.lamp-stage{
  position:relative;
  height:440px;
  display:flex; align-items:center; justify-content:center;
}
.lamp-glow{
  position:absolute;
  width:340px; height:340px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(251,231,168,0.55), rgba(239,194,75,0.16) 45%, transparent 72%);
  filter:blur(2px);
  animation:pulseGlow 4.5s ease-in-out infinite;
}
.lamp-illustration{ position:relative; width:180px; z-index:2; }
.badge{
  position:absolute;
  display:flex; align-items:center; gap:9px;
  background:rgba(8,66,76,0.85);
  border:1px solid var(--line-dark);
  padding:10px 16px 10px 12px;
  border-radius:999px;
  font-size:14.5px;
  color:var(--text-light);
  backdrop-filter:blur(6px);
  animation:floatY 5s ease-in-out infinite;
}
.badge .dot{ width:9px; height:9px; border-radius:50%; }
.badge-news{ top:6%; left:-4%; animation-delay:.2s; }
.badge-news .dot{ background:var(--cyan); }
.badge-gk{ top:44%; right:-8%; animation-delay:1s; }
.badge-gk .dot{ background:var(--gold); }
.badge-quiz{ bottom:4%; left:6%; animation-delay:1.8s; }
.badge-quiz .dot{ background:#8FE3C0; }

.ray-line{ position:absolute; z-index:1; opacity:.5; }

@keyframes pulseGlow{
  0%,100%{ transform:scale(1); opacity:.9; }
  50%{ transform:scale(1.08); opacity:1; }
}
@keyframes floatY{
  0%,100%{ transform:translateY(0); }
  50%{ transform:translateY(-9px); }
}
@media (prefers-reduced-motion: reduce){
  .lamp-glow, .badge{ animation:none; }
}

@media (max-width:940px){
  .hero-grid{ grid-template-columns:1fr; }
  .lamp-stage{ height:320px; margin-top:20px; }
}

/* ---------------- Page hero (inner pages) ---------------- */
.page-hero{
  background:
    radial-gradient(ellipse 520px 320px at 88% 10%, rgba(239,194,75,0.14), transparent 65%),
    linear-gradient(160deg, var(--bg-deep) 0%, #031A1F 100%);
  color:var(--text-light);
  padding:72px 0 64px;
  text-align:center;
}
.page-hero .eyebrow{ justify-content:center; margin-bottom:14px; }
.page-hero h1{ color:var(--text-light); font-size:clamp(28px,4vw,42px); margin-bottom:10px; }
.page-hero p{ color:var(--text-muted); max-width:560px; margin:0 auto; }

/* ---------------- Sections on paper ---------------- */
.section{ padding:88px 0; }
.section-head{ max-width:640px; margin-bottom:52px; }
.section-head h2{ font-size:clamp(26px,3vw,36px); color:var(--ink); }
.section-head p{ color:var(--ink-soft); font-size:17px; }

.cards-3{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:24px;
}
.feature-card{
  background:var(--paper-2);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:32px 28px;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.feature-card:hover{
  transform:translateY(-4px);
  box-shadow:0 18px 34px -20px rgba(11,34,38,0.35);
  border-color:var(--gold-deep);
}
.feature-icon{
  width:52px; height:52px;
  border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(160deg, var(--cyan-deep), var(--bg-deep));
  margin-bottom:20px;
}
.feature-card h3{ font-size:20px; margin-bottom:10px; color:var(--ink); }
.feature-card p{ color:var(--ink-soft); font-size:15.5px; margin-bottom:0; }

.steps{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:0;
  counter-reset:step;
  position:relative;
}
.step{
  position:relative;
  padding:0 28px;
  border-right:1px dashed var(--line);
}
.step:last-child{ border-right:none; }
.step .num{
  font-family:var(--font-display);
  font-size:44px;
  color:var(--gold);
  opacity:.85;
  margin-bottom:10px;
  display:block;
}
.step h4{ font-size:18px; margin-bottom:8px; color:var(--ink); }
.step p{ color:var(--ink-soft); font-size:15px; }
@media (max-width:820px){
  .steps, .cards-3{ grid-template-columns:1fr; }
  .step{ border-right:none; border-bottom:1px dashed var(--line); padding:0 0 28px; margin-bottom:28px; }
  .step:last-child{ border-bottom:none; margin-bottom:0; }
}

.quote-band{
  background:var(--bg-deep);
  color:var(--text-light);
  padding:80px 0;
  text-align:center;
}
.quote-band blockquote{
  font-family:var(--font-accent);
  font-style:italic;
  font-size:clamp(22px,2.6vw,30px);
  max-width:760px;
  margin:0 auto 18px;
  color:var(--gold-glow);
  line-height:1.6;
}
.quote-band cite{ color:var(--cyan-soft); font-size:14.5px; font-style:normal; }

.cta-band{
  background:linear-gradient(135deg, var(--bg-deep-2), var(--bg-deep));
  color:var(--text-light);
  padding:70px 0;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute; inset:0;
  background:radial-gradient(ellipse 500px 260px at 50% 0%, rgba(239,194,75,0.18), transparent 70%);
}
.cta-band .container{ position:relative; }
.cta-band h2{ color:var(--text-light); font-size:clamp(24px,3vw,34px); margin-bottom:12px; }
.cta-band p{ color:var(--text-muted); margin-bottom:30px; }
.cta-band .hero-cta{ justify-content:center; margin-bottom:0; }

/* ---------------- Content / prose pages ---------------- */
.prose-wrap{ padding:64px 0 100px; }
.prose-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-l);
  padding:52px clamp(24px,5vw,64px);
  max-width:840px;
  margin:0 auto;
  box-shadow:0 30px 60px -40px rgba(11,34,38,0.25);
}
.prose-card h2{
  font-size:22px;
  color:var(--ink);
  margin-top:2.1em;
  padding-top:0.2em;
  border-top:1px solid var(--line);
}
.prose-card h2:first-child{ margin-top:0; border-top:none; padding-top:0; }
.prose-card h2 .h-icon{ color:var(--gold-deep); margin-right:8px; }
.prose-card p{ color:var(--ink-soft); font-size:16px; }
.prose-card ul{ color:var(--ink-soft); padding-right:22px; margin:0 0 1.1em; }
.prose-card li{ margin-bottom:8px; }
.meta-updated{
  display:inline-block;
  font-size:13.5px;
  color:var(--cyan-deep);
  background:rgba(34,199,222,0.10);
  border:1px solid rgba(34,199,222,0.25);
  padding:5px 14px;
  border-radius:999px;
  margin-bottom:28px;
}
.prose-card a{ color:var(--cyan-deep); border-bottom:1px solid var(--cyan-deep); }
.prose-card a:hover{ color:var(--gold-deep); border-color:var(--gold-deep); }

/* ---------------- Contact page specifics ---------------- */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
  max-width:900px;
  margin:0 auto;
}
.contact-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:30px;
  text-align:center;
  box-shadow:0 20px 40px -30px rgba(11,34,38,0.3);
}
.contact-card .feature-icon{ margin:0 auto 18px; }
.contact-card h3{ font-size:18px; margin-bottom:8px; }
.contact-card p{ color:var(--ink-soft); font-size:15px; margin-bottom:14px; }
@media (max-width:700px){ .contact-grid{ grid-template-columns:1fr; } }

/* ---------------- Footer ---------------- */
.site-footer{
  background:var(--bg-deep);
  color:var(--text-muted);
  padding:60px 0 30px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr;
  gap:40px;
  padding-bottom:36px;
  border-bottom:1px solid var(--line-dark);
}
.footer-brand .logo{ margin-bottom:14px; }
.footer-brand p{ font-size:14.5px; max-width:320px; }
.footer-col h4{
  font-family:var(--font-body);
  font-weight:600;
  font-size:14.5px;
  color:var(--text-light);
  margin-bottom:16px;
  letter-spacing:0.3px;
}
.footer-col a{
  display:block;
  font-size:14.5px;
  color:var(--text-muted);
  margin-bottom:11px;
  transition:color .15s ease;
}
.footer-col a:hover{ color:var(--gold); }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:22px;
  font-size:13.5px;
  flex-wrap:wrap; gap:10px;
}
@media (max-width:760px){
  .footer-grid{ grid-template-columns:1fr; gap:28px; }
  .footer-bottom{ flex-direction:column; text-align:center; }
}

/* Focus visibility */
a:focus-visible, button:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
}