:root {
  --biru: #1a5fb4;
  --biru-dark: #123f78;
  --hijau: #2ecc71;
  --kuning: #f1c40f;
  --merah: #e74c3c;
  --abu: #e5e7eb;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: #f4f6f9;
  color: #1f2937;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn-block { display: block; width: 100%; }
.btn-primary { background: var(--biru); color: #fff; }
.btn-primary:hover { background: var(--biru-dark); }
.btn-secondary { background: #fff; color: var(--biru); border: 1px solid var(--biru); }
.btn-warning { background: var(--kuning); color: #4a3900; }
.btn-danger { background: var(--merah); color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 14px; }
.alert-error { background: #fdecea; color: #b3261e; border: 1px solid #f5c6cb; }

/* ---------- Login ---------- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--biru), var(--biru-dark));
}
.login-box {
  background: #fff;
  padding: 36px 32px;
  border-radius: 10px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 10px 30px rgba(0,0,0,.2);
}
.login-title { font-size: 18px; color: var(--biru-dark); margin-bottom: 4px; }
.login-sub { font-size: 13px; color: #6b7280; margin-bottom: 20px; }
.login-form label { display: block; font-size: 13px; margin: 12px 0 4px; font-weight: 600; }
.login-form input {
  width: 100%; padding: 10px; border: 1px solid #d1d5db; border-radius: 6px; font-size: 14px;
}
.login-form .btn { margin-top: 20px; }
.login-footer { margin-top: 16px; font-size: 12px; text-align: center; }

/* ---------- Instruksi ---------- */
.instruksi-page { display: flex; justify-content: center; padding: 40px 16px; }
.instruksi-box { background: #fff; padding: 32px; border-radius: 10px; max-width: 640px; width: 100%; box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.instruksi-box h1 { color: var(--biru-dark); font-size: 20px; }
.info-table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.info-table td { padding: 8px; border-bottom: 1px solid var(--abu); font-size: 14px; }
.info-table td:first-child { width: 40%; color: #6b7280; }
.blok-list, .rules-list { font-size: 14px; line-height: 1.7; }
.footer-link { text-align: center; font-size: 13px; margin-top: 16px; }

/* ---------- Ujian ---------- */
.ujian-header {
  background: var(--biru);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  position: sticky; top: 0; z-index: 10;
}
.header-left span { margin-left: 16px; font-size: 13px; opacity: .9; }
.header-right { display: flex; align-items: center; gap: 16px; }
.peserta-nama { font-size: 13px; }
.timer {
  font-family: monospace;
  font-size: 20px;
  font-weight: 700;
  background: rgba(255,255,255,.15);
  padding: 6px 14px;
  border-radius: 6px;
}
.timer.timer-danger { background: var(--merah); }

.ujian-body { display: flex; gap: 16px; padding: 16px; max-width: 1200px; margin: 0 auto; }
.ujian-main { flex: 0 0 75%; background: #fff; padding: 24px; border-radius: 8px; }
.ujian-sidebar { flex: 0 0 25%; background: #fff; padding: 16px; border-radius: 8px; height: fit-content; }

.soal-kategori { font-size: 12px; color: var(--biru); font-weight: 700; text-transform: uppercase; margin-bottom: 8px; }
.soal-stimulus { background: #f9fafb; border: 1px solid var(--abu); border-radius: 6px; padding: 14px; margin-bottom: 16px; font-size: 14px; }
.soal-pertanyaan { font-size: 16px; margin-bottom: 20px; line-height: 1.6; }

.soal-pilihan { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.opsi-card {
  display: flex; align-items: center; gap: 12px;
  border: 1px solid #d1d5db; border-radius: 8px; padding: 12px 16px;
  cursor: pointer; transition: all .15s;
}
.opsi-card:hover { border-color: var(--biru); }
.opsi-card.selected { border-color: var(--biru); background: #eaf1fb; }
.opsi-card input { display: none; }
.opsi-label {
  width: 28px; height: 28px; border-radius: 50%; background: var(--abu);
  display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; font-size: 13px;
}
.opsi-card.selected .opsi-label { background: var(--biru); color: #fff; }
.opsi-teks { font-size: 14px; }

.soal-nav-buttons { display: flex; justify-content: space-between; gap: 10px; }

.nav-title { font-weight: 700; font-size: 14px; margin-bottom: 10px; }
.nav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-bottom: 14px; }
.nav-btn {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  height: 34px; border-radius: 4px; text-decoration: none; font-size: 13px; font-weight: 600;
  background: #fff; border: 1px solid #d1d5db; color: #374151;
}
.nav-belum { background: #fff; border-color: #d1d5db; }
.nav-dijawab { background: var(--hijau); color: #fff; border-color: var(--hijau); }
.nav-ragu { background: var(--kuning); color: #4a3900; border-color: var(--kuning); }
.nav-aktif { outline: 3px solid var(--biru); outline-offset: 1px; }
.nav-check { position: absolute; top: -4px; right: -4px; font-size: 10px; background: #fff; border-radius: 50%; }

.nav-legenda { font-size: 11px; display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.legenda-dot { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: middle; border: 1px solid #d1d5db; }

.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.5);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal-overlay.hidden { display: none; }
.modal-box { background: #fff; padding: 24px; border-radius: 8px; max-width: 400px; width: 100%; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ---------- Hasil / Riwayat ---------- */
.hasil-page, .riwayat-page, .detail-page { display: flex; justify-content: center; padding: 40px 16px; }
.hasil-box, .riwayat-box, .detail-box { background: #fff; padding: 32px; border-radius: 10px; max-width: 720px; width: 100%; }
.skor-akhir { text-align: center; padding: 24px; border-radius: 8px; margin-bottom: 20px; }
.skor-angka { font-size: 42px; font-weight: 800; }
.skor-label { font-size: 14px; font-weight: 600; }
.hasil-hijau { background: #eafaf1; color: #1e7e34; }
.hasil-kuning { background: #fff8e1; color: #8a6d00; }
.hasil-merah { background: #fdecea; color: #b3261e; }
.hasil-actions { display: flex; gap: 10px; margin-top: 20px; }
.riwayat-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.riwayat-table th, .riwayat-table td { padding: 8px; border-bottom: 1px solid var(--abu); text-align: left; }
.row-best { background: #eafaf1; }

@media (max-width: 900px) {
  .ujian-body { flex-direction: column; }
  .ujian-main, .ujian-sidebar { flex: 1 1 100%; }
}