:root{
  --bg:#f6f4fb;
  --card:#ffffff;
  --text:#1f1840;
  --muted:#6f6790;
  --primary:#6d28d9;
  --primary-dark:#5b21b6;
  --secondary:#ec4899;
  --line:#ece7f7;
  --shadow:0 10px 24px rgba(81,42,155,.08);
  --shadow-soft:0 14px 34px rgba(109,40,217,.10);
  --radius-lg:22px;
  --radius-md:16px;
  --radius-sm:12px;
}

*{
  box-sizing:border-box;
}

html,body{
  margin:0;
  padding:0;
}

body{
  font-family:Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:var(--text);
}

a{
  text-decoration:none;
  color:inherit;
}

button,
input{
  font:inherit;
}

.quiz-app{
  min-height:100vh;
}

.quiz-topbar{
  background:#fff;
  border-bottom:1px solid var(--line);
  padding:14px 16px;
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter:blur(10px);
}

.brand-wrap{
  max-width:1100px;
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:12px;
}

.brand-logo{
  width:44px;
  height:44px;
  border-radius:14px;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  font-weight:700;
  font-size:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  box-shadow:0 10px 20px rgba(109,40,217,.18);
}

.brand-wrap h1{
  margin:0;
  font-size:20px;
  line-height:1.2;
}

.brand-wrap p{
  margin:3px 0 0;
  color:var(--muted);
  font-size:13px;
}

.quiz-container{
  max-width:1100px;
  margin:0 auto;
  padding:16px;
}

.quiz-home-tight{
  padding-top:12px;
}

/* hero */
.clean-hero{
  margin-bottom:18px;
}

.hero-card{
  background:linear-gradient(135deg,#ffffff 0%,#fbf7ff 100%);
  border:1px solid var(--line);
  border-radius:24px;
  padding:18px;
  box-shadow:var(--shadow-soft);
}

.hero-card-premium{
  position:relative;
  overflow:hidden;
}

.hero-card-premium::before{
  content:"";
  position:absolute;
  inset:auto -40px -50px auto;
  width:180px;
  height:180px;
  background:radial-gradient(circle, rgba(236,72,153,.12) 0%, rgba(236,72,153,0) 70%);
  pointer-events:none;
}

.hero-card-premium::after{
  content:"";
  position:absolute;
  inset:-50px auto auto -40px;
  width:180px;
  height:180px;
  background:radial-gradient(circle, rgba(109,40,217,.10) 0%, rgba(109,40,217,0) 70%);
  pointer-events:none;
}

.hero-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:14px;
  margin-bottom:14px;
  position:relative;
  z-index:1;
}

.hero-copy{
  flex:1;
}

.hero-badge{
  display:inline-flex;
  align-items:center;
  padding:7px 12px;
  border-radius:999px;
  font-size:12px;
  font-weight:700;
  color:var(--primary);
  background:#f4ecff;
  border:1px solid #e6d8ff;
  margin-bottom:10px;
}

.hero-top h2{
  margin:0;
  font-size:28px;
  line-height:1.1;
}

.hero-top p{
  margin:8px 0 0;
  color:var(--muted);
  font-size:14px;
  line-height:1.55;
  max-width:620px;
}

.hero-search-icon{
  width:48px;
  height:48px;
  border-radius:16px;
  background:linear-gradient(135deg,#f4ecff,#ffe6f2);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:20px;
  flex-shrink:0;
  border:1px solid #eee4ff;
}

.search-shell{
  position:relative;
  display:flex;
  align-items:center;
  background:#fff;
  border:1px solid #ddd5f3;
  border-radius:16px;
  min-height:54px;
  padding:0 12px;
  transition:border-color .2s ease, box-shadow .2s ease, transform .2s ease;
  box-shadow:0 6px 18px rgba(109,40,217,.05);
}

.search-shell:focus-within{
  border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(109,40,217,.10);
}

.search-icon{
  font-size:16px;
  margin-right:10px;
  opacity:.8;
  flex-shrink:0;
}

.hero-search input{
  width:100%;
  min-height:52px;
  padding:0;
  border:none;
  font-size:15px;
  outline:none;
  background:transparent;
  color:var(--text);
}

.hero-search input::placeholder{
  color:#8a82aa;
}

.clear-search-btn{
  width:34px;
  height:34px;
  border:none;
  background:#f4ecff;
  color:var(--primary);
  border-radius:10px;
  cursor:pointer;
  display:none;
  flex-shrink:0;
  font-size:14px;
  font-weight:700;
}

.clear-search-btn.show{
  display:inline-flex;
  align-items:center;
  justify-content:center;
}

.section-block{
  margin-bottom:22px;
}

.first-section-block{
  margin-top:2px;
}

.section-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-bottom:14px;
}

.section-head h3{
  margin:0;
  font-size:21px;
}

.section-note{
  font-size:12px;
  color:var(--muted);
  background:#fff;
  border:1px solid var(--line);
  border-radius:999px;
  padding:7px 12px;
}

.quiz-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}

.quiz-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:24px;
  padding:18px;
  box-shadow:var(--shadow);
  cursor:pointer;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.quiz-card:hover{
  transform:translateY(-2px);
  box-shadow:0 16px 32px rgba(81,42,155,.10);
  border-color:#dccbff;
}

.quiz-card h4{
  margin:0 0 8px;
  font-size:20px;
  line-height:1.2;
}

.quiz-card p{
  margin:0 0 16px;
  color:var(--muted);
  font-size:14px;
  line-height:1.55;
}

.quiz-meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:16px;
}

.meta-pill{
  padding:7px 11px;
  border-radius:999px;
  background:#f8f5ff;
  color:var(--primary);
  font-size:12px;
  font-weight:700;
  border:1px solid #eee4ff;
}

.quiz-card-actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.start-btn,
.share-btn,
.btn{
  min-height:46px;
  border:none;
  border-radius:14px;
  font-size:15px;
  font-weight:700;
  cursor:pointer;
  transition:transform .18s ease, opacity .18s ease, background .18s ease, border-color .18s ease;
}

.start-btn:hover,
.share-btn:hover,
.btn:hover{
  transform:translateY(-1px);
}

.quiz-card .start-btn{
  flex:1 1 180px;
  background:linear-gradient(135deg,var(--primary),#7c3aed);
  color:#fff;
  box-shadow:0 10px 20px rgba(109,40,217,.18);
}

.quiz-card .start-btn:hover{
  background:linear-gradient(135deg,var(--primary-dark),var(--primary));
}

.share-btn{
  flex:0 0 auto;
  padding:0 16px;
  background:#fff;
  color:var(--primary);
  border:1px solid #ddd5f3;
}

.loading-card,
.empty-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:24px;
  padding:20px;
  text-align:center;
  color:var(--muted);
  box-shadow:var(--shadow);
}

/* quiz pages general */
.quiz-page-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:18px;
  box-shadow:var(--shadow);
  margin-bottom:16px;
}

.student-form{
  display:grid;
  gap:12px;
}

.input-field{
  width:100%;
  min-height:48px;
  border:1px solid #ddd5f3;
  border-radius:14px;
  padding:12px 14px;
  font-size:15px;
  outline:none;
}

.input-field:focus{
  border-color:var(--primary);
}

.quiz-stats{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  margin-bottom:14px;
}

.stat-box{
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  padding:14px;
}

.stat-label{
  font-size:13px;
  color:var(--muted);
  margin-bottom:6px;
}

.stat-value{
  font-size:26px;
  font-weight:700;
}

.question-nav{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:14px;
}

.q-nav-btn{
  min-width:40px;
  height:40px;
  border:1px solid #d8cef4;
  background:#fff;
  border-radius:12px;
  color:var(--primary);
  font-weight:700;
  cursor:pointer;
}

.q-nav-btn.active{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}

.q-nav-btn.answered{
  background:#f3ebff;
}

.question-title{
  margin:0 0 14px;
  font-size:22px;
}

.question-text{
  font-size:17px;
  line-height:1.6;
  margin-bottom:16px;
}

.question-image-wrap{
  margin-bottom:16px;
}

.question-image{
  width:100%;
  max-width:420px;
  display:block;
  border-radius:16px;
  border:1px solid var(--line);
  background:#fff;
}

.options-list{
  display:grid;
  gap:12px;
}

.option-card{
  border:1px solid #ddd5f3;
  border-radius:16px;
  padding:14px;
  background:#fff;
  cursor:pointer;
  transition:.2s ease;
}

.option-card:hover{
  border-color:var(--primary);
}

.option-card.selected{
  border-color:var(--primary);
  background:#f7f2ff;
}

.option-row{
  display:flex;
  gap:12px;
  align-items:flex-start;
}

.option-label{
  width:32px;
  height:32px;
  border-radius:10px;
  background:#f3ebff;
  color:var(--primary);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  flex-shrink:0;
}

.option-text{
  line-height:1.5;
  font-size:15px;
}

.action-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  margin-top:18px;
}

.btn-outline{
  background:#fff;
  color:var(--primary);
  border:1px solid #ddd5f3;
}

.btn-primary{
  background:var(--primary);
  color:#fff;
}

.btn-danger{
  background:#dc2626;
  color:#fff;
}

.result-summary{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}

.result-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  padding:16px;
}

.result-card h3{
  margin:0 0 6px;
  font-size:14px;
  color:var(--muted);
}

.result-card .big{
  font-size:28px;
  font-weight:700;
}

.review-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  padding:16px;
  margin-bottom:14px;
}

.review-item.correct{
  border-color:#bbf7d0;
  background:#ecfdf3;
}

.review-item.wrong{
  border-color:#fecaca;
  background:#fef2f2;
}

.review-status{
  display:inline-block;
  padding:6px 10px;
  border-radius:999px;
  font-size:12px;
  font-weight:700;
  margin-bottom:10px;
}

.review-item.correct .review-status{
  color:#166534;
  background:#dcfce7;
}

.review-item.wrong .review-status{
  color:#b91c1c;
  background:#fee2e2;
}

.review-question{
  font-size:17px;
  font-weight:700;
  margin-bottom:10px;
}

.review-text{
  margin:6px 0;
  line-height:1.5;
}

.review-label{
  font-weight:700;
}

.leaderboard-list{
  display:grid;
  gap:10px;
}

.leaderboard-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px;
  display:grid;
  grid-template-columns:40px 1fr auto;
  gap:12px;
  align-items:center;
}

.leaderboard-rank{
  width:40px;
  height:40px;
  border-radius:12px;
  background:#f3ebff;
  color:var(--primary);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
}

.leaderboard-name{
  font-weight:700;
  font-size:15px;
}

.leaderboard-sub{
  color:var(--muted);
  font-size:12px;
  margin-top:3px;
}

.leaderboard-score{
  text-align:right;
}

.leaderboard-score strong{
  display:block;
  font-size:16px;
}

.leaderboard-score span{
  color:var(--muted);
  font-size:12px;
}

@media (min-width:700px){
  .quiz-grid{
    grid-template-columns:repeat(2,1fr);
  }
}

@media (min-width:980px){
  .quiz-grid{
    grid-template-columns:repeat(3,1fr);
  }
}

@media (max-width:768px){
  .quiz-topbar{
    padding:10px 14px;
  }

  .brand-wrap{
    gap:10px;
  }

  .brand-logo{
    width:40px;
    height:40px;
    border-radius:12px;
    font-size:14px;
  }

  .brand-wrap h1{
    font-size:18px;
  }

  .brand-wrap p{
    font-size:12px;
  }

  .quiz-container{
    padding:12px;
  }

  .hero-card{
    padding:16px;
    border-radius:20px;
  }

  .hero-top{
    align-items:flex-start;
    margin-bottom:12px;
  }

  .hero-top h2{
    font-size:22px;
  }

  .hero-top p{
    font-size:13px;
    line-height:1.5;
  }

  .hero-badge{
    font-size:11px;
    padding:6px 10px;
    margin-bottom:9px;
  }

  .hero-search-icon{
    width:40px;
    height:40px;
    border-radius:13px;
    font-size:17px;
  }

  .search-shell{
    min-height:50px;
    border-radius:14px;
    padding:0 10px;
  }

  .search-icon{
    margin-right:8px;
    font-size:15px;
  }

  .hero-search input{
    min-height:48px;
    font-size:14px;
  }

  .clear-search-btn{
    width:30px;
    height:30px;
    border-radius:9px;
    font-size:13px;
  }

  .section-block{
    margin-bottom:16px;
  }

  .section-head{
    margin-bottom:10px;
    align-items:center;
  }

  .section-head h3{
    font-size:17px;
  }

  .section-note{
    font-size:11px;
    padding:6px 9px;
    white-space:nowrap;
  }

  .quiz-grid{
    gap:12px;
  }

  .quiz-card{
    padding:15px;
    border-radius:18px;
  }

  .quiz-card h4{
    font-size:17px;
    margin-bottom:6px;
  }

  .quiz-card p{
    font-size:13px;
    margin-bottom:12px;
  }

  .quiz-meta{
    gap:6px;
    margin-bottom:12px;
  }

  .meta-pill{
    font-size:11px;
    padding:6px 8px;
  }

  .quiz-card-actions{
    gap:8px;
  }

  .quiz-card .start-btn{
    min-height:42px;
    border-radius:13px;
    font-size:14px;
    flex:1 1 100%;
  }

  .share-btn{
    min-height:38px;
    padding:0 14px;
    border-radius:11px;
    font-size:13px;
  }

  .loading-card,
  .empty-card{
    border-radius:18px;
    padding:16px;
  }

  .quiz-page-card{
    padding:14px;
    border-radius:18px;
    margin-bottom:12px;
  }

  .quiz-stats{
    gap:10px;
  }

  .stat-box{
    padding:12px;
    border-radius:14px;
  }

  .stat-label{
    font-size:12px;
  }

  .stat-value{
    font-size:18px;
  }

  .question-nav{
    gap:6px;
    margin-bottom:10px;
  }

  .q-nav-btn{
    min-width:34px;
    height:34px;
    border-radius:10px;
    font-size:13px;
  }

  .question-title{
    font-size:16px !important;
    margin:4px 0 6px !important;
  }

  .question-text{
    font-size:15px !important;
    margin-bottom:8px !important;
  }

  .question-image{
    max-height:180px !important;
  }

  .option-card{
    padding:10px;
    border-radius:14px;
  }

  .option-label{
    width:28px;
    height:28px;
    border-radius:9px;
    font-size:13px;
  }

  .option-text{
    font-size:14px;
  }

  .action-row{
    gap:8px;
    margin-top:12px;
  }

  .btn{
    min-height:42px;
    font-size:14px;
    border-radius:12px;
  }

  .input-field{
    min-height:42px;
    font-size:14px;
    border-radius:12px;
  }

  .result-summary{
    gap:10px;
  }

  .result-card{
    padding:12px;
    border-radius:14px;
  }

  .result-card .big{
    font-size:20px;
  }

  .review-item{
    padding:14px;
    border-radius:16px;
  }

  .review-question{
    font-size:15px;
  }

  .review-text{
    font-size:13px;
  }

  .leaderboard-item{
    grid-template-columns:34px 1fr auto;
    gap:10px;
    padding:12px;
    border-radius:14px;
  }

  .leaderboard-rank{
    width:34px;
    height:34px;
    border-radius:10px;
    font-size:13px;
  }

  .leaderboard-name{
    font-size:14px;
  }
}