/* ============================================================
   23. RUANG UJIAN (CBT) 1.15.0
   Tata letak baru: bilah atas, progres, kartu soal, navigasi, layar tinjau, petunjuk.
   Hanya tampilan; logika ujian ada di js/cbt/.
   ============================================================ */

.ru-root { position: fixed; inset: 0; background: var(--bg-body, #f8fafc); z-index: 3000; display: flex; flex-direction: column; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.ru-root.hidden { display: none; }
.ru-root button { width: auto; margin: 0; box-shadow: none; transform: none; font-family: inherit; }
.ru-root button:hover { transform: none; box-shadow: none; }

/* Bilah atas */
.ru-bar { position: sticky; top: 0; z-index: 20; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 24px; background: #fff; border-bottom: 1px solid #e2e8f0; }
.ru-judul { min-width: 0; }
.ru-judul h3 { margin: 0; font-size: 16px; color: #0f172a; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ru-judul span { font-size: 12px; color: #64748b; }
.ru-bar-kanan { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.ru-timer { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 10px; background: #eff6ff; color: var(--primary); font-weight: 800; font-size: 16px; font-variant-numeric: tabular-nums; }
.ru-timer .ik { width: 18px; height: 18px; }
.ru-timer.mendesak { background: #fee2e2; color: #b91c1c; }
.ru-timer.mendesak span { animation: ru-kedip 1s steps(2, start) infinite; }
@keyframes ru-kedip { 50% { opacity: .55; } }
.ru-root .ru-btn-zen { padding: 8px 14px; font-size: 12px; border-radius: 8px; background: #fff; color: #334155; border: 1.5px solid #cbd5e1; font-weight: 700; cursor: pointer; }
.ru-root .ru-btn-zen:hover { background: #f1f5f9; }

/* Progres */
.ru-progres { height: 4px; background: #e2e8f0; position: sticky; top: 63px; z-index: 19; }
.ru-progres > div { height: 100%; width: 0; background: var(--primary); transition: width .25s ease; }

/* Peringatan pelanggaran */
.ru-peringatan { margin: 12px auto 0; width: calc(100% - 40px); max-width: 1000px; box-sizing: border-box; padding: 12px 16px; border-radius: 12px; background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; font-size: 13px; font-weight: 600; line-height: 1.5; }
.ru-peringatan.hidden { display: none; }

/* Isi */
.ru-badan { max-width: 1000px; width: 100%; margin: 24px auto; padding: 0 20px; box-sizing: border-box; flex: 1; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 20px; align-items: start; }
.ru-kartu { background: #fff; border: 1px solid #e2e8f0; border-radius: 20px; padding: 24px; box-sizing: border-box; box-shadow: 0 4px 15px rgba(0, 0, 0, .02); }
.ru-nav { position: sticky; top: 84px; padding: 20px; }
.ru-nav h4 { margin: 0 0 12px; font-size: 14px; color: #0f172a; }

.ru-soal-kepala { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.ru-nomor { font-weight: 700; color: var(--primary); font-size: 14px; }
.ru-font { display: flex; gap: 6px; }
.ru-root .ru-btn-kecil { padding: 6px 12px; font-size: 12px; border-radius: 8px; background: #f1f5f9; color: #334155; border: 1px solid #e2e8f0; font-weight: 700; cursor: pointer; }
.ru-root .ru-btn-kecil:hover { background: #e2e8f0; }
.ru-konten { font-size: 15px; line-height: 1.6; color: #1e293b; margin-bottom: 24px; overflow-wrap: anywhere; }
.ru-konten img { max-width: 100%; height: auto; }
.ru-konten table { max-width: 100%; display: block; overflow-x: auto; }

.ru-aksi { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; border-top: 1px solid #f1f5f9; padding-top: 18px; }
.ru-aksi-nav { display: flex; gap: 10px; }
.ru-root .ru-btn-nav { padding: 11px 20px; font-size: 13px; border-radius: 10px; background: #fff; color: var(--primary); border: 1.5px solid var(--primary); font-weight: 700; cursor: pointer; }
.ru-root .ru-btn-nav.utama { background: var(--primary); color: #fff; }
.ru-root .ru-btn-nav:hover { filter: brightness(.96); }
.ru-root .ru-btn-ragu { padding: 11px 16px; font-size: 13px; border-radius: 10px; background: #fff; color: #92400e; border: 1.5px solid #fcd34d; font-weight: 700; cursor: pointer; }
.ru-root .ru-btn-ragu.aktif { background: #fef3c7; border-color: #f59e0b; }
.ru-bantuan { margin: 14px 0 0; font-size: 11.5px; color: #94a3b8; }

/* Grid nomor soal */
.ru-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-bottom: 14px; }
.ru-root .cbt-nav-btn { height: 40px; padding: 0; font-size: 13px; font-weight: 700; border-radius: 9px; background: #fff; color: #475569; border: 1.5px solid #cbd5e1; cursor: pointer; width: 100%; }
.ru-root .cbt-nav-btn.answered { background: var(--primary); border-color: var(--primary); color: #fff; }
.ru-root .cbt-nav-btn.doubt { background: #f59e0b; border-color: #f59e0b; color: #fff; }
.ru-root .cbt-nav-btn.active { outline: 3px solid rgba(var(--primary-rgb), .35); outline-offset: 1px; border-color: var(--primary); }
.ru-root .cbt-nav-btn:focus-visible, .ru-root button:focus-visible { outline: 3px solid rgba(var(--primary-rgb), .5); outline-offset: 2px; }
.ru-ringkas { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; font-size: 12px; color: #475569; }
.ru-ringkas b { color: #0f172a; }
.ru-legenda { display: flex; gap: 10px; flex-wrap: wrap; font-size: 11px; color: #64748b; margin-bottom: 16px; }
.ru-legenda span { display: inline-flex; align-items: center; gap: 5px; }
.ru-legenda i { width: 12px; height: 12px; border-radius: 4px; border: 1.5px solid #cbd5e1; display: inline-block; }
.ru-legenda .k-jawab { background: var(--primary); border-color: var(--primary); }
.ru-legenda .k-ragu { background: #f59e0b; border-color: #f59e0b; }
.ru-root .ru-btn-kumpul { width: 100%; padding: 13px; font-size: 13px; font-weight: 700; border-radius: 12px; background: #059669; color: #fff; border: none; cursor: pointer; }
.ru-root .ru-btn-kumpul:hover { background: #047857; }

/* Layar tinjau */
.ru-tinjau { position: fixed; inset: 0; z-index: 3100; background: rgba(15, 23, 42, .6); display: flex; align-items: center; justify-content: center; padding: 16px; box-sizing: border-box; overflow-y: auto; }
.ru-tinjau.hidden { display: none; }
.ru-tinjau-kartu { background: #fff; border-radius: 20px; padding: 24px; max-width: 460px; width: 100%; box-sizing: border-box; max-height: 100%; overflow-y: auto; }
.ru-tinjau-kartu h3 { margin: 0 0 8px; font-size: 18px; color: #0f172a; }
.ru-tinjau-ringkas { margin: 0 0 16px; font-size: 14px; color: #334155; line-height: 1.6; }
.ru-tinjau-ringkas .bahaya { color: #b91c1c; font-weight: 700; }
.ru-tinjau-catatan { margin: 0 0 18px; font-size: 12px; color: #64748b; }
.ru-tinjau-aksi { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; }

/* Petunjuk sebelum mulai */
.pu-kartu { max-width: 480px; text-align: left; max-height: calc(100vh - 30px); max-height: calc(100dvh - 30px); overflow-y: auto; }
.pu-kartu h3 { margin: 0 0 4px; }
.pu-nama { margin: 0 0 16px; font-size: 14px; color: #475569; font-weight: 600; }
.pu-info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 16px; }
.pu-info div { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 12px; padding: 10px; text-align: center; }
.pu-info span { display: block; font-size: 11px; color: #64748b; margin-bottom: 2px; }
.pu-info strong { font-size: 14px; color: #0f172a; }
.pu-aturan { margin: 0 0 16px; padding-left: 20px; font-size: 13px; line-height: 1.7; color: #334155; }
.pu-setuju { display: flex; align-items: flex-start; gap: 10px; font-size: 13px; color: #334155; margin: 0 0 16px; cursor: pointer; }
.pu-setuju input { width: 18px; height: 18px; margin: 1px 0 0; flex-shrink: 0; accent-color: var(--primary); }
.pu-aksi { display: flex; gap: 10px; justify-content: flex-end; }
.pu-aksi button { width: auto; padding: 11px 22px; }
.pu-aksi button:disabled { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }

/* Layar kecil: satu kolom, tombol navigasi menempel di bawah */
@media (max-width: 860px) {
    .ru-bar { padding: 10px 14px; }
    .ru-progres { top: 57px; }
    .ru-root .ru-btn-zen { display: none; }
    .ru-badan { grid-template-columns: 1fr; margin: 14px auto 0; padding: 0 12px; gap: 14px; }
    .ru-kartu { padding: 16px; border-radius: 16px; }
    .ru-nav { position: static; margin-bottom: 20px; }
    .ru-grid { grid-template-columns: repeat(7, 1fr); }
    .ru-peringatan { width: calc(100% - 24px); }
    .ru-soal .ru-aksi { position: sticky; bottom: 0; background: #fff; margin: 0 -16px -16px; padding: 12px 16px; border-radius: 0 0 16px 16px; box-shadow: 0 -6px 14px rgba(15, 23, 42, .06); z-index: 5; }
    .ru-soal .ru-aksi { flex-wrap: nowrap; gap: 8px; }
    .ru-aksi-nav { flex: 0 0 auto; gap: 8px; }
    .ru-root .ru-btn-nav, .ru-root .ru-btn-ragu { padding: 10px 11px; font-size: 12.5px; white-space: nowrap; }
    .ru-bantuan { display: none; }
    .pu-info { gap: 6px; }
    .pu-info div { padding: 8px 4px; }
    .pu-info strong { font-size: 13px; }
}
@media (max-width: 380px) { .ru-grid { grid-template-columns: repeat(6, 1fr); } }
@media (prefers-reduced-motion: reduce) { .ru-timer.mendesak span { animation: none; } .ru-progres > div { transition: none; } }

/* Mode gelap */
body.dark-mode .ru-root { background: #0f172a; }
body.dark-mode .ru-bar, body.dark-mode .ru-kartu, body.dark-mode .ru-tinjau-kartu { background: #1e293b; border-color: #334155; }
body.dark-mode .ru-judul h3, body.dark-mode .ru-nav h4, body.dark-mode .ru-tinjau-kartu h3, body.dark-mode .ru-ringkas b, body.dark-mode .pu-info strong { color: #f1f5f9; }
body.dark-mode .ru-konten, body.dark-mode .ru-tinjau-ringkas, body.dark-mode .pu-aturan, body.dark-mode .pu-setuju { color: #e2e8f0; }
body.dark-mode .ru-judul span, body.dark-mode .ru-ringkas, body.dark-mode .ru-legenda, body.dark-mode .ru-tinjau-catatan, body.dark-mode .pu-nama { color: #94a3b8; }
body.dark-mode .ru-timer { background: #1e3a5f; color: #93c5fd; }
body.dark-mode .ru-timer.mendesak { background: #450a0a; color: #fca5a5; }
body.dark-mode .ru-progres { background: #334155; }
body.dark-mode .ru-root .ru-btn-zen, body.dark-mode .ru-root .ru-btn-kecil { background: #334155; color: #e2e8f0; border-color: #475569; }
body.dark-mode .ru-root .ru-btn-nav { background: #1e293b; color: #93c5fd; border-color: #3b82f6; }
body.dark-mode .ru-root .ru-btn-nav.utama { background: var(--primary); color: #fff; border-color: var(--primary); }
body.dark-mode .ru-root .ru-btn-ragu { background: #1e293b; color: #fcd34d; border-color: #92400e; }
body.dark-mode .ru-root .ru-btn-ragu.aktif { background: #422006; border-color: #f59e0b; }
body.dark-mode .ru-root .cbt-nav-btn { background: #0f172a; color: #cbd5e1; border-color: #475569; }
body.dark-mode .ru-root .cbt-nav-btn.answered { background: var(--primary); border-color: var(--primary); color: #fff; }
body.dark-mode .ru-root .cbt-nav-btn.doubt { background: #f59e0b; border-color: #f59e0b; color: #0f172a; }
body.dark-mode .ru-aksi { border-color: #334155; }
body.dark-mode .ru-peringatan { background: #450a0a; border-color: #7f1d1d; color: #fecaca; }
body.dark-mode .pu-kartu { background: #1e293b; }
body.dark-mode .pu-kartu h3 { color: #f1f5f9; }
body.dark-mode .pu-info div { background: #0f172a; border-color: #334155; }
body.dark-mode .ru-soal .ru-aksi { background: #1e293b; }
body.dark-mode .cbt-option-label { background: #0f172a; border-color: #334155; }
body.dark-mode .cbt-option-label div { color: #e2e8f0; }
body.dark-mode .cbt-option-label:has(input:checked) { background: rgba(var(--primary-rgb), .18); border-color: var(--primary); }
body.dark-mode .ru-konten > div { color: #f1f5f9 !important; }