/* ═══════════════════════════════════════════════════════════
   pdf.css — তোমার quiz CSS এর সাথে fully matched theme
═══════════════════════════════════════════════════════════ */

/* CSS Variables — তোমার existing theme থেকে নেওয়া */
:root{
  --bg:#050A14;
  --bg2:#081428;
  --card:#0B1A33;
  --blue:#1A6EE8;
  --blue2:#3B8FF5;
  --cyan:#00D4FF;
  --text:#E6EEF8;
  --muted:#8AA0BC;
  --border:rgba(96,207,255,.15);
}

*{margin:0;padding:0;box-sizing:border-box}
html,body{
  background:var(--bg);
  color:var(--text);
  font-family:'Hind Siliguri','DM Sans',sans-serif;
  min-height:100vh;
  /* Optional text selection disable for protection */
  -webkit-user-select:none;
  -moz-user-select:none;
  user-select:none;
}

/* ─── NAVBAR (same as quiz) ─── */
.quiz-nav{
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 5%;border-bottom:1px solid var(--border);
  background:rgba(5,10,20,.8);backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:100;
}
.logo-img{height:42px}
.back-home{
  color:var(--text);text-decoration:none;font-size:14px;
  padding:10px 18px;border:1px solid var(--border);border-radius:10px;
  transition:.3s;display:inline-flex;align-items:center;gap:8px;
}
.back-home:hover{background:var(--blue);border-color:var(--blue)}

/* ─── HEADER ─── */
.pdf-header{padding:50px 5% 30px;text-align:center}
.eyebrow{
  display:inline-block;font-family:'DM Sans',sans-serif;font-size:11px;
  letter-spacing:3px;text-transform:uppercase;color:var(--cyan);
  padding:6px 16px;border:1px solid var(--border);border-radius:50px;margin-bottom:20px;
}
h1{
  font-family:'Playfair Display',serif;font-size:clamp(32px,5vw,52px);
  font-weight:900;margin-bottom:14px;line-height:1.15;
}
h1 em{color:var(--cyan);font-style:italic;font-weight:400}
.subtitle{color:var(--muted);font-size:16px}

/* ─── PDF GRID ─── */
.pdf-section{padding:30px 5% 80px}
.pdf-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:22px;
}

/* ─── PDF CARD ─── */
.pdf-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:18px;
  overflow:hidden;
  cursor:pointer;
  transition:.4s cubic-bezier(.23,1,.32,1);
  position:relative;
  display:flex;flex-direction:column;
}

/* Top accent line — appears on hover (matches quiz cards) */
.pdf-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
  transform:scaleX(0);transform-origin:left;
  transition:.4s;z-index:2;
}
.pdf-card:hover{
  transform:translateY(-6px);
  border-color:var(--cyan);
  box-shadow:0 20px 50px rgba(0,212,255,.15);
}
.pdf-card:hover::before{transform:scaleX(1)}

/* Cover image area */
.pdf-cover{
  position:relative;
  width:100%;
  aspect-ratio:16/10;
  background:linear-gradient(135deg,var(--bg2),var(--card));
  overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.pdf-cover img{
  width:100%;height:100%;object-fit:cover;
  transition:.6s;
  -webkit-user-drag:none;
}
.pdf-card:hover .pdf-cover img{transform:scale(1.05)}

/* Fallback PDF icon (shown if image fails to load) */
.pdf-cover-fallback{
  font-size:60px;color:var(--cyan);opacity:.5;
}

/* Play badge overlay (top-right) */
.pdf-badge{
  position:absolute;top:12px;right:12px;
  background:rgba(0,212,255,.15);
  border:1px solid rgba(0,212,255,.4);
  color:var(--cyan);
  font-family:'DM Sans',sans-serif;font-size:10px;font-weight:600;
  letter-spacing:1.5px;text-transform:uppercase;
  padding:5px 12px;border-radius:50px;
  backdrop-filter:blur(8px);
  z-index:1;
}

/* Body */
.pdf-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}

/* Title — 1 line with ellipsis */
.pdf-title{
  font-family:'DM Sans',sans-serif;
  font-size:19px;
  font-weight:700;
  color:var(--text);
  line-height:1.3;
  margin-bottom:8px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* Description — 2 lines with ellipsis */
.pdf-desc{
  font-size:13.5px;
  color:var(--muted);
  line-height:1.6;
  margin-bottom:16px;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

/* Footer with read button */
.pdf-footer{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:14px;border-top:1px solid var(--border);
  margin-top:auto;
}
.pdf-meta{
  font-family:'DM Sans',sans-serif;font-size:11px;
  color:var(--muted);letter-spacing:1px;text-transform:uppercase;
  display:flex;align-items:center;gap:6px;
}
.pdf-read-btn{
  display:inline-flex;align-items:center;gap:7px;
  color:var(--cyan);font-size:13px;font-weight:600;
  font-family:'DM Sans',sans-serif;
}
.pdf-read-btn i{transition:.3s}
.pdf-card:hover .pdf-read-btn i{transform:translateX(4px)}

/* ═══ PDF VIEWER MODAL ═══ */
.pdf-modal{
  display:none;
  position:fixed;inset:0;z-index:9999;
  background:rgba(5,10,20,.96);
  backdrop-filter:blur(20px);
  flex-direction:column;
  animation:fadeIn .3s;
}
.pdf-modal.open{display:flex}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.pdf-modal-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;
  background:var(--card);
  border-bottom:1px solid var(--border);
}
.pdf-modal-title{
  font-family:'DM Sans',sans-serif;font-weight:600;font-size:15px;
  color:var(--text);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  max-width:80%;
}
.pdf-close{
  width:38px;height:38px;border-radius:10px;
  background:rgba(0,212,255,.1);
  border:1px solid var(--border);
  color:var(--text);font-size:15px;cursor:pointer;
  transition:.3s;display:flex;align-items:center;justify-content:center;
}
.pdf-close:hover{background:var(--blue);border-color:var(--blue);transform:rotate(90deg)}

.pdf-frame-wrap{flex:1;position:relative;background:#000}
.pdf-frame-wrap iframe{
  width:100%;height:100%;border:none;display:block;
}
/* Invisible overlay guard — prevents some right-click interactions on iframe */
.pdf-overlay-guard{
  position:absolute;inset:0;
  background:transparent;
  pointer-events:none; /* allow scrolling */
}

/* ─── RESPONSIVE ─── */
@media(max-width:600px){
  .pdf-grid{grid-template-columns:1fr;gap:16px}
  .pdf-header{padding:30px 5% 20px}
  .pdf-modal-bar{padding:12px 16px}
  .pdf-modal-title{font-size:13px}
}

/*
═══════════════════════════════════════════════════════════
SECURITY NOTE (গুরুত্বপূর্ণ):
═══════════════════════════════════════════════════════════
ওয়েব অ্যাপে PDF download বা screen recording পুরোপুরি বন্ধ করা সম্ভব নয়।
আমরা যা করেছি:
✅ Right-click disabled
✅ Keyboard shortcuts (Ctrl+S, Ctrl+P) blocked
✅ Text selection disabled
✅ PDF viewer toolbar hidden (#toolbar=0)
✅ Image drag disabled

কিন্তু advanced user browser dev tools, screen recorder,
বা direct URL দিয়ে PDF নামিয়ে নিতে পারে।
সম্পূর্ণ protection-এর জন্য server-side DRM প্রয়োজন।
═══════════════════════════════════════════════════════════
*/