:root{
  --bg: #f6f8fc;
  --surface: #ffffff;
  --text: #0b1220;
  --muted: #5b6475;
  --border: rgba(17, 24, 39, 0.12);

  --primary: #0b5ed7;     /* deep maritime blue */
  --primary2: #7c3aed;    /* violet accent */
  --primary3: #0ea5e9;    /* sky accent */

  --good: #1b8f3a;
  --bad: #d32f2f;

  --shadow: 0 10px 30px rgba(2, 8, 23, 0.10);
  --radius: 16px;
}

*{ box-sizing: border-box; }

html, body{
  height: 100%;
}

body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 400px at 20% -10%, rgba(14,165,233,0.18), transparent 55%),
              radial-gradient(900px 380px at 90% 0%, rgba(124,58,237,0.16), transparent 55%),
              var(--bg);
  display: flex;
  justify-content: center;
  padding: 14px;
}

#app{
  width: 100%;
  max-width: 560px;
  background: transparent;
}

.shell{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 94vh;
  display: flex;
  flex-direction: column;
}

.header{
  padding: 16px 16px 14px 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  color: #fff;
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo{
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: rgba(255,255,255,0.92);
  padding: 8px;
  object-fit: contain;
  flex: 0 0 auto;
}

.brand-wrap{
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand{
  font-weight: 900;
  letter-spacing: 0.4px;
  font-size: 18px;
  line-height: 1.1;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product{
  font-size: 12.5px;
  opacity: 0.92;
  line-height: 1.2;
}

.badge{
  margin-top: 6px;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.25);
  font-size: 12px;
}

.content{
  padding: 18px 16px 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.view{ display: flex; flex-direction: column; gap: 14px; }
.hidden{ display: none !important; }

h2{
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.2px;
}
h3{
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.2px;
}
p{
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.field{
  display: flex;
  flex-direction: column;
  gap: 6px;
}
label{
  font-size: 12.5px;
  color: var(--muted);
}
input, select{
  width: 100%;
  padding: 14px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  outline: none;
  font-size: 16px;
  background: #fff;
}
input:focus, select:focus{
  border-color: rgba(11,94,215,0.55);
  box-shadow: 0 0 0 4px rgba(11,94,215,0.12);
}

.row{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 520px){
  .row{ grid-template-columns: 1fr; }
}

.main-btn{
  border: none;
  cursor: pointer;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.3px;
  background: var(--primary);
  color: #fff;
  transition: transform 0.05s ease, opacity 0.15s ease;
}
.main-btn:active{ transform: translateY(1px); opacity: 0.9; }
.main-btn.secondary{
  background: rgba(11,94,215,0.10);
  color: var(--primary);
  border: 1px solid rgba(11,94,215,0.22);
}

.help{
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
}

.stats{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--muted);
  font-size: 13px;
}
.timer{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.75);
}
.progress-bar{
  height: 9px;
  background: rgba(17,24,39,0.08);
  border-radius: 999px;
  overflow: hidden;
}
#progress-fill{
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary3), var(--primary));
  transition: width 0.25s ease;
}

.q-card{
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}

#q-text{
  margin: 0;
  font-size: 16px;
  line-height: 1.4;
}

.option-card{
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  padding: 12px 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  cursor: pointer;
  transition: border-color 0.12s ease, transform 0.05s ease;
  text-align: left;
  font-size: 15px;
}
.option-card:active{ transform: translateY(1px); }
.option-card:hover{ border-color: rgba(11,94,215,0.45); }

.opt-letter{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 10px;
  font-weight: 900;
  color: var(--primary);
  background: rgba(11,94,215,0.10);
  border: 1px solid rgba(11,94,215,0.18);
  flex: 0 0 auto;
  margin-top: 1px;
}
.opt-text{ line-height: 1.35; }

.is-correct{
  background: rgba(27,143,58,0.10) !important;
  border-color: rgba(27,143,58,0.45) !important;
}
.is-wrong{
  background: rgba(211,47,47,0.10) !important;
  border-color: rgba(211,47,47,0.45) !important;
}
.is-correct .opt-letter{
  background: rgba(27,143,58,0.14);
  border-color: rgba(27,143,58,0.32);
  color: var(--good);
}
.is-wrong .opt-letter{
  background: rgba(211,47,47,0.14);
  border-color: rgba(211,47,47,0.30);
  color: var(--bad);
}

.score-box{
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  background: rgba(255,255,255,0.8);
  display: grid;
  gap: 8px;
}

.score-line{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

#score-pct{
  font-size: 44px;
  font-weight: 900;
  letter-spacing: -0.6px;
}

.pill{
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  border: 1px solid var(--border);
  color: var(--muted);
}

.ref-item{
  font-size: 14px;
  background: #fff;
  padding: 12px;
  border-left: 4px solid var(--bad);
  margin-bottom: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  page-break-inside: avoid;
}

.action-area{
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 4px 0 8px 0;
}

#pdf-btn{
  background: var(--good);
}

.small-note{
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}