/* ============================================================
   MCQ সমাধান — Professional Design System v3.0
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ── Design Tokens ── */
:root {
  /* Surfaces - Light Theme */
  --bg-deep:       #F8FAFC;
  --bg-surface:    #FFFFFF;
  --bg-card:       #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --bg-elevated:   #F1F5F9;

  /* Brand */
  --primary:       #3B82F6;
  --primary-soft:  rgba(59,130,246,0.12);
  --primary-glow:  rgba(59,130,246,0.25);
  --accent:        #8B5CF6;

  /* Status */
  --success:       #22C55E;
  --success-soft:  rgba(34,197,94,0.12);
  --error:         #EF4444;
  --error-soft:    rgba(239,68,68,0.12);
  --warning:       #F59E0B;
  --warning-soft:  rgba(245,158,11,0.12);

  /* Category Colors */
  --hsc:           #06B6D4;
  --hsc-soft:      rgba(6,182,212,0.10);
  --hsc-border:    rgba(6,182,212,0.25);
  --ssc:           #A78BFA;
  --ssc-soft:      rgba(167,139,250,0.10);
  --ssc-border:    rgba(167,139,250,0.25);
  --medical:       #F472B6;
  --medical-soft:  rgba(244,114,182,0.10);
  --medical-border:rgba(244,114,182,0.25);

  /* Text - Light Theme */
  --text-white:    #0F172A;
  --text-primary:  #1E293B;
  --text-secondary:#475569;
  --text-muted:    #64748B;

  /* Borders - Light Theme */
  --border:        rgba(0,0,0,0.08);
  --border-light:  rgba(0,0,0,0.04);
  --border-focus:  rgba(59,130,246,0.5);

  /* Utility */
  --radius-sm:     8px;
  --radius-md:     12px;
  --radius-lg:     16px;
  --radius-xl:     24px;
  --radius-full:   100px;
  --transition:    0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font:          'Inter', 'Hind Siliguri', system-ui, sans-serif;
  --nav-h:         64px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: var(--font); }
button { cursor: pointer; border: none; background: none; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 4px; }

/* ── Ambient Glow (background) ── */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 40% at 20% 0%, rgba(59,130,246,0.06), transparent 50%),
    radial-gradient(ellipse 50% 50% at 80% 100%, rgba(139,92,246,0.04), transparent 50%);
}

/* ── Container ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ── Gradient Text Utility ── */
.gradient-text {
  background: linear-gradient(135deg, #1E293B 20%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==============================================================
   NAVBAR
   ============================================================== */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.2rem; font-weight: 800;
  color: var(--text-white);
}
.logo-box {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  box-shadow: 0 2px 12px rgba(59,130,246,0.3);
}
/* Legacy class support */
.logo-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.logo-icon span { -webkit-text-fill-color: white; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.875rem; font-weight: 600;
  color: var(--text-secondary); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text-white); background: rgba(0,0,0,0.05); }

/* Dropdown Support */
.nav-dropdown { position: relative; display: inline-block; }
.dropdown-content {
  display: none; position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(10px);
  min-width: 180px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-sm); z-index: 1001;
  padding: 8px 0; backdrop-filter: blur(var(--blur-md)); transition: var(--transition);
}
.dropdown-content a {
  display: block; padding: 10px 20px; font-size: 0.82rem; font-weight: 500;
  color: var(--text-secondary); text-align: left; border-radius: 0;
}
.dropdown-content a:hover { background: var(--primary-soft); color: var(--primary); }
.nav-dropdown:hover .dropdown-content { display: block; transform: translateX(-50%) translateY(0); }

.nav-links a.hsc { color: var(--hsc); }
.nav-links a.ssc { color: var(--ssc); }
.nav-links a.med { color: var(--medical); }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; padding: 8px; cursor: pointer;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-secondary); border-radius: 2px;
  transition: var(--transition);
}

/* ==============================================================
   HERO SECTION
   ============================================================== */
.hero {
  padding: 80px 20px 50px;
  text-align: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 18px; border-radius: var(--radius-full);
  background: var(--primary-soft);
  border: 1px solid rgba(59,130,246,0.2);
  color: var(--primary); font-size: 0.82rem; font-weight: 700;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900; line-height: 1.15;
  margin-bottom: 16px;
}
.hero p {
  color: var(--text-secondary);
  font-size: 1.05rem; max-width: 560px;
  margin: 0 auto 36px; line-height: 1.7;
}

/* ==============================================================
   HOME CATEGORY CARDS
   ============================================================== */
.home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px; margin-bottom: 60px;
}
.home-card {
  position: relative;
  padding: 32px 28px;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all 0.35s ease;
  display: flex; flex-direction: column; gap: 16px;
  overflow: hidden; text-decoration: none;
}
.home-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}
.home-card-icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.home-card-label {
  font-size: 0.7rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-muted);
}
.home-card-title {
  font-size: 1.5rem; font-weight: 800;
  line-height: 1.25; color: var(--text-white);
}
.home-card-desc { font-size: 0.85rem; color: var(--text-secondary); }
.home-card-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; gap: 8px; flex-wrap: wrap; }
.home-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto; padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}
.home-card-status { display: flex; align-items: center; gap: 8px; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-muted);
}
.status-dot.live {
  background: var(--success);
  box-shadow: 0 0 8px rgba(34,197,94,0.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.home-card-arrow { font-size: 1.1rem; color: var(--text-muted); transition: var(--transition); }
.home-card:hover .home-card-arrow { transform: translateX(4px); color: var(--text-white); }

/* HSC */
.card-hsc { border-color: var(--hsc-border); }
.card-hsc:hover { border-color: var(--hsc); box-shadow: 0 16px 40px rgba(6,182,212,0.12); }
.card-hsc .home-card-icon { background: var(--hsc-soft); }
.card-hsc .home-card-title { color: var(--hsc); }
/* SSC */
.card-ssc { border-color: var(--ssc-border); }
.card-ssc:hover { border-color: var(--ssc); box-shadow: 0 16px 40px rgba(167,139,250,0.12); }
.card-ssc .home-card-icon { background: var(--ssc-soft); }
.card-ssc .home-card-title { color: var(--ssc); }
/* Medical */
.card-med { border-color: var(--medical-border); }
.card-med:hover { border-color: var(--medical); box-shadow: 0 16px 40px rgba(244,114,182,0.12); }
.card-med .home-card-icon { background: var(--medical-soft); }
.card-med .home-card-title { color: var(--medical); }

/* ==============================================================
   EXAM SOLUTION PAGE
   ============================================================== */
.exam-hero { padding: 50px 0 24px; }
.exam-title-card {
  padding: 36px; border-radius: var(--radius-lg);
  background: var(--bg-card); border: 1px solid var(--border);
  margin-bottom: 36px;
}
.exam-title-card h1 { font-size: 1.6rem; font-weight: 800; line-height: 1.3; color: var(--text-white); }
.exam-tag-list { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.tag-pill {
  padding: 5px 14px; border-radius: var(--radius-full);
  background: var(--bg-elevated); border: 1px solid var(--border-light);
  font-size: 0.8rem; font-weight: 600; color: var(--text-secondary);
}

/* MCQ Solution Key */
.mcq-section { margin-bottom: 48px; }
.mcq-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.mcq-row {
  padding: 14px 18px; border-radius: var(--radius-md);
  background: var(--bg-card); border: 1px solid var(--border);
  display: flex; align-items: center; gap: 14px;
  transition: var(--transition);
}
.mcq-row:hover { background: var(--bg-card-hover); border-color: var(--border-light); }
.mcq-num-box {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--bg-elevated); border: 1px solid var(--border-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 800; color: var(--text-muted);
  flex-shrink: 0;
}
.ans-pill {
  flex: 1; padding: 10px 16px; border-radius: 10px;
  background: var(--success-soft);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--success); font-weight: 700;
  display: flex; align-items: center; justify-content: space-between;
  transition: all 0.3s ease;
}
.ans-pill.empty {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
}
.ans-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; opacity: 0.7; }
.ans-val { font-size: 1.1rem; font-weight: 800; }

/* Question Images */
.visual-section { margin-bottom: 48px; }
.visual-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}
.visual-item {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--border); cursor: zoom-in;
  transition: var(--transition);
}
.visual-item:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 32px rgba(59,130,246,0.15);
}
.visual-item img { width: 100%; transition: transform 0.4s ease; }
.visual-item:hover img { transform: scale(1.03); }

/* Lightbox */
.modal-overlay {
  position: fixed; inset: 0; z-index: 5000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  display: none; align-items: center; justify-content: center;
  padding: 24px;
}
.modal-overlay.active { display: flex; }
.modal-close {
  position: absolute; top: 24px; right: 24px;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(0,0,0,0.05); border: 1px solid rgba(0,0,0,0.1);
  color: var(--text-primary); font-size: 1.3rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition);
}
.modal-close:hover { background: var(--error); border-color: var(--error); }

/* ==============================================================
   BUTTONS
   ============================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius-sm);
  font-size: 0.875rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 2px 10px rgba(59,130,246,0.3);
}
.btn-primary:hover {
  background: #2563EB;
  box-shadow: 0 4px 20px rgba(59,130,246,0.4);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--bg-elevated); color: var(--text-secondary);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover { background: var(--bg-card-hover); color: var(--text-white); }
.btn-danger {
  background: var(--error-soft); color: var(--error);
  border: 1px solid rgba(239,68,68,0.25);
}
.btn-danger:hover { background: var(--error); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }

/* ==============================================================
   FORMS
   ============================================================== */
.form-section {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  margin-bottom: 20px;
}
.form-section h3 {
  font-size: 1rem; font-weight: 700; margin-bottom: 20px;
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
  color: var(--text-white);
}
.form-row { display: grid; gap: 16px; margin-bottom: 16px; }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }

.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-group:last-child { margin-bottom: 0; }
.form-group label, .form-label {
  font-size: 0.78rem; font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.form-group input,
.form-group select,
.form-group textarea,
.form-input {
  width: 100%; padding: 11px 14px;
  background: var(--bg-surface); color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.9rem; outline: none;
  transition: var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.form-group input::placeholder,
.form-group textarea::placeholder,
.form-input::placeholder {
  color: var(--text-muted);
}
.form-group select option { background: var(--bg-surface); }
.form-group textarea { resize: vertical; min-height: 80px; }

/* ==============================================================
   FOOTER
   ============================================================== */
footer {
  border-top: 1px solid var(--border);
  padding: 36px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ==============================================================
   ADMIN LAYOUT
   ============================================================== */
.admin-pane {
  display: grid; grid-template-columns: 260px 1fr;
  min-height: 100vh;
}
.admin-nav {
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  padding: 32px 20px;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto;
}
.admin-nav .nav-logo { margin-bottom: 36px; }
.admin-nav .sidebar-nav { display: flex; flex-direction: column; gap: 4px; }
.admin-nav .sidebar-nav a,
.sidebar-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: var(--radius-sm);
  font-size: 0.875rem; font-weight: 500;
  color: var(--text-secondary); transition: var(--transition);
  text-decoration: none;
}
.admin-nav .sidebar-nav a:hover,
.admin-nav .sidebar-nav a.active,
.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: var(--primary-soft); color: var(--primary);
}
.sidebar-nav a svg { width: 18px; height: 18px; flex-shrink: 0; }

.admin-content {
  padding: 40px;
  background: var(--bg-deep);
  min-height: 100vh;
}
.admin-topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 32px; gap: 16px; flex-wrap: wrap;
}
.admin-topbar h1 { font-size: 1.5rem; font-weight: 800; color: var(--text-white); }

.admin-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; overflow: hidden;
}

/* Legacy admin layout support */
.admin-layout { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
.admin-sidebar {
  width: 260px; background: var(--bg-surface);
  border-right: 1px solid var(--border);
  padding: 32px 20px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.sidebar-logo {
  font-size: 1.1rem; font-weight: 800; color: var(--primary);
  padding-bottom: 20px; margin-bottom: 16px; border-bottom: 1px solid var(--border);
}
.admin-main { padding: 40px; min-height: 100vh; }

/* Stat Cards */
.stat-cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 32px;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
}
.stat-card-num { font-size: 2.2rem; font-weight: 900; color: var(--primary); }
.stat-card-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* Data Table */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td {
  padding: 14px 16px; text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}
.data-table th {
  color: var(--text-muted); font-size: 0.72rem;
  font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em;
}
.data-table tr:hover td { background: rgba(255,255,255,0.02); }

.status-badge {
  padding: 4px 12px; border-radius: var(--radius-full);
  font-size: 0.72rem; font-weight: 700;
  background: var(--bg-elevated); color: var(--text-secondary);
}
.status-published { background: var(--success-soft); color: var(--success); }
.status-draft { background: var(--warning-soft); color: var(--warning); }

/* Answer Grid (Admin Post Editor) */
.answer-grid-container { overflow-x: auto; }
.answer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}
.ans-row {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 10px;
}
.ans-row-num {
  font-size: 0.75rem; font-weight: 800;
  color: var(--text-muted); width: 24px; text-align: center;
}
.ans-opts { display: flex; gap: 4px; }
.ans-opt {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--bg-card); border: 1.5px solid var(--border-light);
  color: var(--text-secondary); font-size: 0.8rem; font-weight: 700;
  cursor: pointer; transition: var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.ans-opt:hover { border-color: var(--primary); color: var(--primary); }
.ans-opt.selected { background: var(--primary); border-color: var(--primary); color: #fff; }

/* Image Upload */
.img-upload-area {
  border: 2px dashed var(--border-light); border-radius: var(--radius-md);
  padding: 40px; text-align: center; cursor: pointer;
  transition: var(--transition); background: rgba(0,0,0,0.01);
}
.img-upload-area:hover { border-color: var(--primary); background: var(--primary-soft); }
.img-upload-area input[type="file"] { display: none; }
.img-upload-icon { font-size: 2.5rem; margin-bottom: 8px; }
.img-upload-text { font-size: 0.875rem; color: var(--text-secondary); }

/* ==============================================================
   RESPONSIVE
   ============================================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none; position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 12px 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; }
  .hero { padding: 50px 20px 30px; }
  .hero h1 { font-size: 2rem; }
  .home-grid { grid-template-columns: 1fr; gap: 14px; }
  .home-card { padding: 24px 20px; }
  .mcq-list { grid-template-columns: 1fr; }
  .visual-grid { grid-template-columns: 1fr; }
  .form-row.cols-2 { grid-template-columns: 1fr; }
  .admin-pane { grid-template-columns: 1fr; }
  .admin-layout { grid-template-columns: 1fr; }
  .admin-nav, .admin-sidebar { display: none; }
  .admin-content, .admin-main { padding: 20px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.9rem; }
  .home-card-title { font-size: 1.25rem; }
}