/* ═══════════════════════════════════════════════════════════
   NU CCNA Practice Exam — Redesigned UI v4
   Brand: NetworkUstad Teal (#009688) + Navy (#0D1B2A)
   ═══════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; }

:root {
    --exam-teal:      #009688;
    --exam-teal-dk:   #00796b;
    --exam-teal-lt:   #e0f5f3;
    --exam-teal-mid:  #00897b;
    --exam-navy:      #0D1B2A;
    --exam-navy-md:   #1a3154;
    --exam-blue:      #2563eb;
    --exam-blue-dk:   #1d4ed8;
    --exam-blue-lt:   #eff6ff;
    --exam-green:     #16a34a;
    --exam-green-lt:  #f0fdf4;
    --exam-orange:    #ea580c;
    --exam-red:       #dc2626;
    --exam-red-lt:    #fff1f1;
    --exam-surface:   #ffffff;
    --exam-bg:        #f4f8f8;
    --exam-border:    #e2e8f0;
    --exam-border-md: #cbd5e1;
    --exam-text:      #0f172a;
    --exam-text-md:   #334155;
    --exam-text-sm:   #64748b;
    --exam-text-xs:   #94a3b8;
    --exam-radius:    14px;
    --exam-shadow-sm: 0 1px 4px rgba(0,0,0,.06);
    --exam-shadow:    0 4px 20px rgba(0,0,0,.08);
    --exam-shadow-lg: 0 12px 40px rgba(0,0,0,.12);
}

/* Page wrapper added by page template */
.nu-exam-page-wrap {
    background: var(--exam-bg);
    min-height: 100vh;
    padding-bottom: 60px;
}
.nu-exam-page-inner {
    max-width: 100%;
}

.nu-exam-app {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 0 80px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', system-ui, sans-serif;
    color: var(--exam-text);
    background: var(--exam-bg);
    min-height: 100vh;
}

/* ── SCREENS ─────────────────────────────────────────────── */
.nu-screen { display: none; }
.nu-screen.active { display: block; }

/* ══════════════════════════════════════════════════════════
   CUSTOM MODAL
   ══════════════════════════════════════════════════════════ */
.nu-modal-overlay {
    position: fixed; inset: 0; z-index: 9999;
    background: rgba(13,27,42,.6);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
    animation: nu-fade-in .15s ease;
}
.nu-modal-overlay.nu-modal-hide { display: none; }
.nu-modal-box {
    background: var(--exam-surface);
    border-radius: 20px;
    padding: 32px 28px 24px;
    max-width: 420px; width: 100%;
    box-shadow: var(--exam-shadow-lg);
    animation: nu-slide-up .2s ease;
    text-align: center;
}
.nu-modal-icon { font-size: 40px; margin-bottom: 12px; }
.nu-modal-title {
    font-size: 18px; font-weight: 800; color: var(--exam-text);
    margin: 0 0 8px;
}
.nu-modal-msg {
    font-size: 14px; color: var(--exam-text-sm);
    margin: 0 0 24px; line-height: 1.6;
}
.nu-modal-actions { display: flex; gap: 10px; justify-content: center; }
.nu-modal-btn {
    flex: 1; max-width: 160px;
    padding: 11px 20px; border-radius: 10px;
    font-size: 14px; font-weight: 700; cursor: pointer;
    border: 2px solid transparent; transition: all .15s;
}
.nu-modal-btn-cancel {
    background: var(--exam-bg); color: var(--exam-text-md);
    border-color: var(--exam-border-md);
}
.nu-modal-btn-cancel:hover { border-color: var(--exam-text-sm); }
.nu-modal-btn-ok {
    background: var(--exam-teal); color: #fff;
    border-color: var(--exam-teal);
}
.nu-modal-btn-ok:hover { background: var(--exam-teal-dk); }
.nu-modal-btn-ok.danger { background: var(--exam-red); border-color: var(--exam-red); }
.nu-modal-btn-ok.danger:hover { background: #b91c1c; }

@keyframes nu-fade-in  { from { opacity:0 } to { opacity:1 } }
@keyframes nu-slide-up { from { transform:translateY(20px); opacity:0 } to { transform:translateY(0); opacity:1 } }

/* ══════════════════════════════════════════════════════════
   LOGIN WALL
   ══════════════════════════════════════════════════════════ */
.nu-exam-login-wrap {
    display: flex; align-items: center; justify-content: center;
    min-height: 60vh; padding: 40px 20px;
}
.nu-exam-login-box {
    background: var(--exam-surface); border: 1.5px solid var(--exam-border);
    border-radius: 24px; padding: 52px 44px;
    text-align: center; max-width: 460px; width: 100%;
    box-shadow: var(--exam-shadow-lg);
}
.nu-exam-login-icon { font-size: 52px; margin-bottom: 18px; }
.nu-exam-login-box h2 {
    font-size: 26px; font-weight: 900; color: var(--exam-text);
    margin: 0 0 10px;
}
.nu-exam-login-box p {
    color: var(--exam-text-sm); margin: 0 0 30px; line-height: 1.65;
}
.nu-exam-login-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ══════════════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════════════ */
.nu-btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 7px; padding: 11px 22px; border-radius: 10px;
    font-size: 14px; font-weight: 700; cursor: pointer;
    border: 2px solid transparent; transition: all .18s;
    text-decoration: none; letter-spacing: .01em;
}
.nu-btn-primary {
    background: linear-gradient(135deg, var(--exam-teal) 0%, var(--exam-teal-dk) 100%);
    color: #fff; border-color: var(--exam-teal);
    box-shadow: 0 3px 12px rgba(0,150,136,.25);
}
.nu-btn-primary:hover {
    background: linear-gradient(135deg, var(--exam-teal-mid) 0%, #005f56 100%);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0,150,136,.4);
    color: #fff;
}
.nu-btn-outline {
    background: var(--exam-surface); color: var(--exam-teal);
    border-color: #80cbc4;
}
.nu-btn-outline:hover { border-color: var(--exam-teal); background: var(--exam-teal-lt); }
.nu-btn-success { background: var(--exam-green); color: #fff; border-color: var(--exam-green); }
.nu-btn-success:hover { background: #15803d; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(22,163,74,.3); }
.nu-btn-flag { background: #fff7ed; color: var(--exam-orange); border-color: #fed7aa; }
.nu-btn-flag:hover, .nu-btn-flag.flagged { background: var(--exam-orange); color: #fff; border-color: var(--exam-orange); }
.nu-btn-lg { padding: 15px 30px; font-size: 16px; border-radius: 12px; }
.nu-btn-block { width: 100%; }
.nu-btn:disabled { opacity: .45; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
.nu-arrow { transition: transform .2s; }
.nu-btn:hover .nu-arrow { transform: translateX(3px); }

/* ══════════════════════════════════════════════════════════
   CONFIG SCREEN — HERO
   Teal-to-navy gradient replacing old blue
   ══════════════════════════════════════════════════════════ */
.nu-exam-hero {
    text-align: center;
    padding: 52px 24px 40px;
    background: linear-gradient(150deg, var(--exam-navy) 0%, #0a2540 50%, #00332d 100%);
    border-radius: 0 0 36px 36px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}
/* Subtle teal glow accent */
.nu-exam-hero::before {
    content: '';
    position: absolute;
    top: -60px; right: -60px;
    width: 260px; height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,150,136,.25) 0%, transparent 70%);
    pointer-events: none;
}
.nu-exam-hero::after {
    content: '';
    position: absolute;
    bottom: -40px; left: 10%;
    width: 180px; height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,150,136,.12) 0%, transparent 70%);
    pointer-events: none;
}
.nu-exam-hero-icon {
    font-size: 54px; margin-bottom: 16px;
    filter: drop-shadow(0 4px 16px rgba(0,200,183,.35));
    position: relative; z-index: 1;
    display: block;
}
.nu-exam-hero h1 {
    font-size: clamp(22px, 4vw, 38px);
    font-weight: 900; color: #fff;
    margin: 0 0 10px; letter-spacing: -.02em;
    position: relative; z-index: 1;
}
.nu-exam-hero p {
    color: #80cbc4; /* teal-tinted subtext */
    margin: 0 0 20px;
    font-size: 15px;
    position: relative; z-index: 1;
}

/* Stat pills in hero */
.nu-hero-pills {
    display: flex; justify-content: center; gap: 10px; flex-wrap: wrap;
    position: relative; z-index: 1;
}
.nu-hero-pill {
    background: rgba(0,150,136,.18);
    border: 1px solid rgba(0,200,183,.3);
    color: #80cbc4;
    font-size: 12px; font-weight: 600;
    padding: 5px 14px; border-radius: 20px;
}

/* ── CONFIG CARD ─────────────────────────────────────────── */
.nu-config-card {
    background: var(--exam-surface);
    border: 1.5px solid var(--exam-border);
    border-radius: 20px;
    padding: 8px 28px 24px;
    box-shadow: 0 4px 24px rgba(0,0,0,.07), 0 0 0 1px rgba(0,150,136,.05);
    margin: 0 16px;
}
.nu-config-row {
    display: flex; align-items: center;
    justify-content: space-between; gap: 20px;
    padding: 20px 0; border-bottom: 1px solid #f1f5f9;
    flex-wrap: wrap;
}
.nu-config-row:last-child { border-bottom: none; padding-bottom: 8px; }
.nu-config-label { display: flex; flex-direction: column; }
.nu-config-label-text { font-weight: 700; color: var(--exam-text); font-size: 15px; }
.nu-config-label-hint { font-size: 12px; color: var(--exam-text-xs); margin-top: 3px; }

/* Question count pills — teal active state */
.nu-q-count-pills { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.nu-pill {
    padding: 9px 20px; border-radius: 999px;
    border: 2px solid var(--exam-border);
    background: var(--exam-surface); font-size: 14px;
    font-weight: 700; color: var(--exam-text-sm);
    cursor: pointer; transition: all .15s;
}
.nu-pill.active {
    background: var(--exam-teal); color: #fff;
    border-color: var(--exam-teal);
    box-shadow: 0 2px 10px rgba(0,150,136,.3);
}
.nu-pill:hover:not(.active) { border-color: var(--exam-teal); color: var(--exam-teal); }
.nu-pill-custom input {
    width: 84px; padding: 9px 12px; border: 2px solid var(--exam-border);
    border-radius: 999px; font-size: 14px; font-weight: 700;
    text-align: center; outline: none; transition: border-color .15s;
    color: var(--exam-text);
}
.nu-pill-custom input:focus { border-color: var(--exam-teal); }

/* Domain select */
.nu-select {
    appearance: none; -webkit-appearance: none;
    padding: 10px 36px 10px 14px;
    border: 2px solid var(--exam-border);
    border-radius: 10px; font-size: 14px; font-weight: 500;
    color: var(--exam-text); background: var(--exam-surface);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23009688' stroke-width='1.8' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    cursor: pointer; min-width: 230px;
}
.nu-select:focus { outline: none; border-color: var(--exam-teal); }

/* Time badge — teal */
.nu-time-badge {
    background: var(--exam-teal-lt);
    border: 1.5px solid #80cbc4;
    color: var(--exam-teal-dk);
    padding: 9px 20px; border-radius: 999px;
    font-size: 14px; font-weight: 700;
    display: inline-flex; align-items: center; gap: 6px;
}

/* ── Start button — full teal ─────────────────────────────── */
#nu-start-btn.nu-btn-primary {
    margin-top: 8px;
    letter-spacing: .3px;
    font-size: 16px;
    padding: 16px 30px;
}

/* ══════════════════════════════════════════════════════════
   LOADING
   ══════════════════════════════════════════════════════════ */
.nu-loading-wrap {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    min-height: 55vh; gap: 20px;
    color: var(--exam-text-sm); font-size: 15px;
}
.nu-spinner {
    width: 48px; height: 48px;
    border: 4px solid var(--exam-border);
    border-top-color: var(--exam-teal);
    border-radius: 50%; animation: nu-spin .75s linear infinite;
}
.nu-spinner-green { border-top-color: var(--exam-green); }
@keyframes nu-spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════════════════════
   EXAM SCREEN — STICKY HEADER
   ══════════════════════════════════════════════════════════ */
.nu-exam-header {
    display: flex; align-items: center;
    justify-content: space-between; gap: 16px;
    padding: 14px 20px;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--exam-border);
    position: sticky; top: 0; z-index: 100;
}
.nu-exam-progress-wrap { flex: 1; display: flex; align-items: center; gap: 12px; }
.nu-exam-q-counter {
    font-size: 12px; font-weight: 700;
    color: var(--exam-text-sm); white-space: nowrap;
    background: var(--exam-bg); padding: 4px 10px;
    border-radius: 999px; border: 1px solid var(--exam-border);
}
.nu-exam-progress-bar {
    flex: 1; height: 6px; background: #e2e8f0;
    border-radius: 999px; overflow: hidden;
}
.nu-exam-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--exam-teal), #26c6da);
    border-radius: 999px; transition: width .35s ease;
}
.nu-timer {
    display: flex; align-items: center; gap: 6px;
    font-size: 17px; font-weight: 800; color: var(--exam-text);
    background: var(--exam-bg); padding: 7px 16px;
    border-radius: 999px; border: 2px solid var(--exam-border);
    white-space: nowrap; font-variant-numeric: tabular-nums;
    transition: all .3s;
}
.nu-timer.nu-timer-warning {
    color: var(--exam-red); background: var(--exam-red-lt);
    border-color: #fecaca; animation: nu-pulse-timer 1s ease-in-out infinite;
}
@keyframes nu-pulse-timer { 0%,100%{opacity:1} 50%{opacity:.55} }

/* ══════════════════════════════════════════════════════════
   QUESTION CARD
   ══════════════════════════════════════════════════════════ */
.nu-question-wrap { padding: 24px 16px 8px; }
.nu-question-card {
    background: var(--exam-surface);
    border: 1.5px solid var(--exam-border);
    border-radius: 20px; padding: 28px;
    box-shadow: var(--exam-shadow);
    transition: box-shadow .2s;
}
.nu-question-card:hover { box-shadow: 0 6px 28px rgba(0,0,0,.1); }

.nu-q-meta {
    display: flex; align-items: center; gap: 8px;
    margin-bottom: 18px; flex-wrap: wrap;
}
.nu-q-number {
    font-size: 11px; font-weight: 800; color: var(--exam-text-xs);
    text-transform: uppercase; letter-spacing: .6px;
}
.nu-q-domain {
    font-size: 11px; font-weight: 700; color: var(--exam-teal);
    background: var(--exam-teal-lt); padding: 4px 12px;
    border-radius: 999px;
}
.nu-q-type { font-size: 10px; font-weight: 700; padding: 3px 9px; border-radius: 999px; }
.nu-type-mcq        { background: #f0fdf4; color: #15803d; }
.nu-type-true_false { background: #fefce8; color: #854d0e; }
.nu-type-drag_drop  { background: #f0f9ff; color: #0369a1; }

.nu-q-divider { height: 1px; background: var(--exam-border); margin: 0 0 20px; }
.nu-q-text {
    font-size: 17px; font-weight: 600; color: var(--exam-text);
    line-height: 1.65; margin-bottom: 24px;
}
.nu-q-image {
    max-width: 100%; border-radius: 12px; margin-bottom: 20px;
    border: 1px solid var(--exam-border); box-shadow: var(--exam-shadow-sm);
}

/* ══════════════════════════════════════════════════════════
   MCQ OPTIONS — Teal selected state
   ══════════════════════════════════════════════════════════ */
.nu-multi-note { margin: 0 0 12px; padding: 9px 12px; border-radius: 8px; background: var(--exam-teal-lt); color: var(--exam-text-md); font-size: 13px; font-weight: 700; }
.nu-options-list { display: flex; flex-direction: column; gap: 10px; }
.nu-option-item {
    display: flex; align-items: center; gap: 14px;
    padding: 14px 18px; border: 2px solid var(--exam-border);
    border-radius: 14px; cursor: pointer;
    transition: all .18s; position: relative;
    overflow: hidden;
}
.nu-option-item::before {
    content: ''; position: absolute; inset: 0;
    background: var(--exam-teal-lt);
    opacity: 0; transition: opacity .18s;
}
.nu-option-item:hover { border-color: #80cbc4; }
.nu-option-item:hover::before { opacity: 1; }
.nu-option-item.selected { border-color: var(--exam-teal); background: var(--exam-teal-lt); }
.nu-option-item.selected::before { opacity: 0; }
.nu-option-item input[type="radio"], .nu-option-item input[type="checkbox"] { display: none; }
.nu-opt-letter {
    position: relative; z-index: 1;
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 32px; height: 32px; border-radius: 10px;
    background: var(--exam-bg); color: var(--exam-text-sm);
    font-weight: 800; font-size: 13px; flex-shrink: 0;
    border: 1.5px solid var(--exam-border);
    transition: all .18s;
}
.nu-option-item.selected .nu-opt-letter {
    background: var(--exam-teal); color: #fff;
    border-color: var(--exam-teal); box-shadow: 0 2px 8px rgba(0,150,136,.3);
}
.nu-opt-text {
    position: relative; z-index: 1;
    font-size: 15px; color: var(--exam-text-md); line-height: 1.45;
    transition: color .15s;
}
.nu-option-item.selected .nu-opt-text { color: var(--exam-text); font-weight: 600; }

/* ══════════════════════════════════════════════════════════
   DRAG-DROP
   ══════════════════════════════════════════════════════════ */
.nu-dd-wrap { display: flex; flex-direction: column; gap: 20px; }
.nu-dd-pool {
    background: var(--exam-bg);
    border: 2px dashed var(--exam-border-md);
    border-radius: 14px; padding: 16px;
}
.nu-dd-pool-label {
    font-size: 11px; font-weight: 700; color: var(--exam-text-xs);
    text-transform: uppercase; letter-spacing: .6px; margin-bottom: 12px;
}
.nu-dd-item {
    display: inline-flex; align-items: center;
    padding: 8px 16px; background: var(--exam-surface);
    border: 2px solid #80cbc4; border-radius: 10px;
    font-size: 13px; font-weight: 700; color: var(--exam-teal-dk);
    cursor: grab; margin: 4px; transition: all .15s;
    user-select: none; box-shadow: var(--exam-shadow-sm);
}
.nu-dd-item:active { cursor: grabbing; transform: scale(1.06); box-shadow: 0 6px 20px rgba(0,150,136,.2); }
.nu-dd-zones { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.nu-dd-zone { background: var(--exam-surface); border: 2px solid var(--exam-border); border-radius: 14px; overflow: hidden; }
.nu-dd-zone-label {
    background: linear-gradient(135deg, var(--exam-navy), var(--exam-navy-md));
    color: #80cbc4; font-size: 11px; font-weight: 700;
    padding: 9px 14px; text-transform: uppercase; letter-spacing: .6px;
}
.nu-dd-zone-items {
    min-height: 64px; padding: 10px;
    display: flex; flex-wrap: wrap; gap: 6px; transition: background .15s;
}
.nu-dd-zone.sortable-over .nu-dd-zone-items { background: var(--exam-teal-lt); }

/* ══════════════════════════════════════════════════════════
   NAVIGATION BAR
   ══════════════════════════════════════════════════════════ */
.nu-exam-nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 16px; gap: 10px;
    background: var(--exam-surface);
    border-top: 1px solid var(--exam-border);
}

/* ══════════════════════════════════════════════════════════
   QUESTION DOTS
   ══════════════════════════════════════════════════════════ */
.nu-q-dots-wrap {
    padding: 16px 16px 8px;
    background: var(--exam-surface);
    border-top: 1px solid var(--exam-border);
}
.nu-q-dots-label {
    font-size: 11px; font-weight: 700; color: var(--exam-text-xs);
    text-transform: uppercase; letter-spacing: .5px;
    margin-bottom: 10px;
}
.nu-q-dots { display: flex; flex-wrap: wrap; gap: 5px; }
.nu-dot {
    width: 32px; height: 32px; border-radius: 8px;
    border: 2px solid var(--exam-border); background: var(--exam-surface);
    font-size: 11px; font-weight: 700; color: var(--exam-text-sm);
    cursor: pointer; transition: all .15s;
    display: inline-flex; align-items: center; justify-content: center;
}
.nu-dot:hover { border-color: var(--exam-teal); color: var(--exam-teal); transform: translateY(-1px); }
.nu-dot.current  { border-color: var(--exam-teal); background: var(--exam-teal); color: #fff; box-shadow: 0 3px 10px rgba(0,150,136,.35); }
.nu-dot.answered { border-color: #22c55e; background: var(--exam-green-lt); color: var(--exam-green); }
.nu-dot.flagged  { border-color: #f97316; background: #fff7ed; color: var(--exam-orange); }

.nu-dots-legend {
    display: flex; gap: 16px; margin-top: 10px; flex-wrap: wrap;
}
.nu-dots-legend-item {
    display: flex; align-items: center; gap: 5px;
    font-size: 11px; color: var(--exam-text-xs); font-weight: 500;
}
.nu-dots-legend-dot {
    width: 12px; height: 12px; border-radius: 3px;
    border: 1.5px solid;
}

.nu-exam-submit-wrap {
    padding: 16px 16px 0;
    display: flex; justify-content: flex-end;
    gap: 12px; flex-wrap: wrap;
}

/* ══════════════════════════════════════════════════════════
   RESULT SCREEN
   ══════════════════════════════════════════════════════════ */
.nu-result-wrap { max-width: 740px; margin: 0 auto; padding: 32px 16px; }

.nu-score-card {
    background: linear-gradient(150deg, var(--exam-navy) 0%, #0a2540 50%, #00332d 100%);
    border-radius: 24px; padding: 48px 36px;
    text-align: center; margin-bottom: 20px;
    box-shadow: 0 12px 40px rgba(13,27,42,.3);
    position: relative; overflow: hidden;
}
.nu-score-card::before {
    content: ''; position: absolute;
    top: -60px; right: -60px; width: 200px; height: 200px;
    border-radius: 50%; background: rgba(0,150,136,.15);
}
.nu-score-card::after {
    content: ''; position: absolute;
    bottom: -40px; left: -40px; width: 150px; height: 150px;
    border-radius: 50%; background: rgba(0,200,183,.1);
}
.nu-score-emoji { font-size: 56px; margin-bottom: 12px; position: relative; z-index: 1; }
.nu-score-pct {
    font-size: 80px; font-weight: 900; line-height: 1;
    margin-bottom: 6px; position: relative; z-index: 1;
    font-variant-numeric: tabular-nums; color: #fff;
}
.nu-score-label {
    font-size: 20px; font-weight: 700; color: #e2e8f0;
    margin-bottom: 8px; position: relative; z-index: 1;
}
.nu-score-detail {
    font-size: 15px; color: #64748b;
    position: relative; z-index: 1;
}
.nu-score-badge {
    display: inline-block; padding: 4px 16px;
    border-radius: 999px; font-size: 12px; font-weight: 700;
    text-transform: uppercase; letter-spacing: .5px;
    margin-bottom: 16px; position: relative; z-index: 1;
}
.nu-score-badge.pass { background: rgba(0,150,136,.2); color: #4dd0c4; border: 1px solid rgba(0,150,136,.3); }
.nu-score-badge.fail { background: rgba(220,38,38,.2); color: #f87171; border: 1px solid rgba(220,38,38,.3); }

.nu-domain-breakdown {
    background: var(--exam-surface); border: 1.5px solid var(--exam-border);
    border-radius: 20px; padding: 24px; margin-bottom: 20px;
    box-shadow: var(--exam-shadow-sm);
}
.nu-domain-breakdown h3 {
    font-size: 14px; font-weight: 800; color: var(--exam-text);
    margin: 0 0 18px; text-transform: uppercase; letter-spacing: .5px;
}
.nu-domain-row {
    display: grid; grid-template-columns: 1fr 2fr 52px 52px;
    align-items: center; gap: 12px; margin-bottom: 14px;
}
.nu-domain-name { font-size: 13px; font-weight: 600; color: var(--exam-text-md); }
.nu-domain-bar-wrap { height: 8px; background: #f1f5f9; border-radius: 999px; overflow: hidden; }
.nu-domain-bar { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--exam-teal), #26c6da); transition: width .7s cubic-bezier(.22,1,.36,1); }
.nu-domain-pct { font-size: 13px; font-weight: 800; text-align: right; color: var(--exam-teal-dk); }
.nu-domain-score { font-size: 11px; color: var(--exam-text-xs); text-align: right; }

.nu-result-actions {
    display: flex; gap: 12px; justify-content: center;
    margin-bottom: 28px; flex-wrap: wrap;
}

.nu-review-section-title {
    font-size: 14px; font-weight: 800; color: var(--exam-text);
    text-transform: uppercase; letter-spacing: .5px;
    margin: 0 0 14px;
}
.nu-review-item {
    background: var(--exam-surface); border: 1.5px solid var(--exam-border);
    border-radius: 16px; padding: 18px; margin-bottom: 10px;
    transition: box-shadow .15s;
}
.nu-review-item:hover { box-shadow: var(--exam-shadow-sm); }
.nu-review-item.correct { border-left: 4px solid #22c55e; }
.nu-review-item.wrong   { border-left: 4px solid var(--exam-red); }
.nu-review-item-header {
    display: flex; align-items: flex-start; gap: 10px; margin-bottom: 8px;
}
.nu-review-status-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }
.nu-review-q   { font-size: 14px; font-weight: 600; color: var(--exam-text); line-height: 1.5; }
.nu-review-correct {
    font-size: 13px; color: var(--exam-green); font-weight: 600;
    margin: 6px 0; display: flex; align-items: center; gap: 5px;
}
.nu-review-exp {
    font-size: 13px; color: var(--exam-text-sm); line-height: 1.6;
    background: var(--exam-bg); padding: 10px 14px;
    border-radius: 10px; margin-top: 8px;
    border-left: 3px solid #80cbc4;
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */
@media(max-width:640px) {
    .nu-exam-hero { padding: 36px 16px 28px; border-radius: 0 0 24px 24px; }
    .nu-config-card { padding: 6px 16px 20px; margin: 0 8px; }
    .nu-config-row { flex-direction: column; align-items: flex-start; gap: 10px; }
    .nu-select { min-width: 100%; }
    .nu-exam-header { flex-wrap: wrap; }
    .nu-question-card { padding: 20px 16px; }
    .nu-q-text { font-size: 15px; }
    .nu-opt-text { font-size: 14px; }
    .nu-dd-zones { grid-template-columns: 1fr; }
    .nu-domain-row { grid-template-columns: 1fr 1.5fr 40px 40px; }
    .nu-score-pct { font-size: 60px; }
    .nu-score-card { padding: 36px 24px; }
    .nu-exam-nav .nu-btn { padding: 10px 14px; font-size: 13px; }
    .nu-dot { width: 28px; height: 28px; font-size: 10px; }
}

/* ══════════════════════════════════════════════════════════
   PROCTOR MODE — Strike Badge, Warning Banner
   ══════════════════════════════════════════════════════════ */

/* Strike badge — sits next to timer in exam header */
#nu-strike-badge {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 700;
    color: #92400e;
    background: #fef3c7;
    border: 1.5px solid #fcd34d;
    padding: 6px 14px;
    border-radius: 999px;
    white-space: nowrap;
    transition: all .2s;
    user-select: none;
}
#nu-strike-badge.nu-strike-hit {
    background: #fee2e2;
    border-color: #fca5a5;
    color: #991b1b;
    transform: scale(1.08);
}
#nu-strike-badge.nu-strike-danger {
    background: #fee2e2;
    border-color: #f87171;
    color: #b91c1c;
    animation: nu-strike-pulse 1s ease-in-out infinite;
}
@keyframes nu-strike-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(220,38,38,.4); }
    50%       { box-shadow: 0 0 0 6px rgba(220,38,38,0); }
}

/* Warning banner — slides in from top */
#nu-warning-banner {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 99999;
    background: linear-gradient(135deg, #b91c1c, #dc2626);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    padding: 14px 24px;
    letter-spacing: .01em;
    box-shadow: 0 4px 20px rgba(185,28,28,.4);
    transform: translateY(-110%);
    transition: transform .35s cubic-bezier(.22,1,.36,1);
    pointer-events: none;
}
#nu-warning-banner.nu-banner-show {
    transform: translateY(0);
}

/* Fullscreen mode — hide page chrome that leaks outside plugin */
:fullscreen #nu-exam-app,
:-webkit-full-screen #nu-exam-app,
:-moz-full-screen #nu-exam-app {
    background: var(--exam-bg);
    max-width: 100%;
    min-height: 100vh;
    overflow-y: auto;
}
/* Dark overlay behind modals in fullscreen */
:fullscreen .nu-modal-overlay,
:-webkit-full-screen .nu-modal-overlay {
    position: fixed;
}

/* Proctor notice below start button */
.nu-proctor-note {
    text-align: center;
    font-size: 12px;
    color: var(--exam-text-xs);
    margin: 10px 0 0;
    padding: 0;
}

/* ══════════════════════════════════════════════════════════
   DARK MODE
   ══════════════════════════════════════════════════════════ */
body.nu-dark {
    background: #0f172a;
    color: #e2e8f0;
}
body.nu-dark .nu-exam-app { background: #0f172a; }
body.nu-dark .nu-config-card,
body.nu-dark .nu-question-card,
body.nu-dark .nu-domain-breakdown,
body.nu-dark .nu-progress-card,
body.nu-dark .nu-result-progress-card,
body.nu-dark .nu-weak-domains,
body.nu-dark .nu-lb-wrap,
body.nu-dark .nu-lb-row,
body.nu-dark .nu-review-item,
body.nu-dark .nu-modal-box { background: #1e293b; border-color: #334155; color: #e2e8f0; }
body.nu-dark .nu-exam-header { background: rgba(15,23,42,.94); border-color: #334155; }
body.nu-dark .nu-pill { background: #1e293b; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-pill:hover:not(.active) { border-color: #009688; color: #4dd0c4; }
body.nu-dark .nu-select { background: #1e293b; border-color: #334155; color: #e2e8f0; }
body.nu-dark .nu-option-item { border-color: #334155; }
body.nu-dark .nu-option-item:hover { border-color: #4dd0c4; }
body.nu-dark .nu-option-item::before { background: rgba(0,150,136,.15); }
body.nu-dark .nu-opt-letter { background: #0f172a; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-opt-text { color: #cbd5e1; }
body.nu-dark .nu-config-label-text { color: #e2e8f0; }
body.nu-dark .nu-config-label-hint { color: #64748b; }
body.nu-dark .nu-config-row { border-color: #1e293b; }
body.nu-dark .nu-q-text { color: #e2e8f0; }
body.nu-dark .nu-review-exp { background: #0f172a; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-exam-q-counter { background: #1e293b; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-timer { background: #1e293b; border-color: #334155; color: #e2e8f0; }
body.nu-dark .nu-dot { background: #1e293b; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-exam-nav,
body.nu-dark .nu-q-dots-wrap { background: #1e293b; border-color: #334155; }
body.nu-dark .nu-modal-overlay { background: rgba(0,0,0,.7); }
body.nu-dark .nu-modal-btn-cancel { background: #0f172a; border-color: #334155; color: #94a3b8; }
body.nu-dark .nu-lb-row { border-color: #334155; }
body.nu-dark .nu-lb-tabs { background: #0f172a; }
body.nu-dark .nu-lb-tab { color: #64748b; }
body.nu-dark .nu-lb-tab.active { background: #009688; color: #fff; }
body.nu-dark .nu-exam-page-wrap { background: #0f172a; }

/* ══════════════════════════════════════════════════════════
   TOPBAR (dark mode + leaderboard buttons)
   ══════════════════════════════════════════════════════════ */
.nu-topbar {
    display: flex; align-items: center; justify-content: flex-end;
    gap: 10px; padding: 12px 16px 0;
}
.nu-dark-btn {
    display: flex; align-items: center; gap: 6px;
    padding: 7px 14px; border-radius: 999px;
    border: 1.5px solid var(--exam-border);
    background: var(--exam-surface); color: var(--exam-text-sm);
    font-size: 13px; font-weight: 600; cursor: pointer;
    transition: all .15s;
}
.nu-dark-btn:hover { border-color: var(--exam-teal); color: var(--exam-teal); }
body.nu-dark .nu-dark-btn { background: #1e293b; border-color: #334155; color: #94a3b8; }

.nu-lb-btn {
    display: flex; align-items: center; gap: 6px;
    padding: 7px 14px; border-radius: 999px;
    border: 1.5px solid var(--exam-border);
    background: var(--exam-surface); color: var(--exam-text-sm);
    font-size: 13px; font-weight: 600; cursor: pointer;
    transition: all .15s;
}
.nu-lb-btn:hover { border-color: #f59e0b; color: #d97706; background: #fffbeb; }

/* ══════════════════════════════════════════════════════════
   PROGRESS CARD (config screen)
   ══════════════════════════════════════════════════════════ */
.nu-progress-card,
.nu-result-progress-card {
    background: var(--exam-surface);
    border: 1.5px solid var(--exam-border);
    border-radius: 16px; padding: 16px 20px;
    margin: 16px 16px 0; box-shadow: var(--exam-shadow-sm);
}
.nu-progress-card-header {
    display: flex; justify-content: space-between; align-items: center;
    font-size: 13px; font-weight: 700; color: var(--exam-text-md);
    margin-bottom: 12px;
}
#nu-progress-stats-summary { color: var(--exam-text-sm); font-weight: 500; font-size: 12px; }

/* ══════════════════════════════════════════════════════════
   SHARE BAR
   ══════════════════════════════════════════════════════════ */
.nu-share-bar {
    display: flex; align-items: center; gap: 10px;
    flex-wrap: wrap; margin-bottom: 20px;
    padding: 14px 20px; background: var(--exam-surface);
    border: 1.5px solid var(--exam-border); border-radius: 14px;
}
.nu-share-label { font-size: 13px; font-weight: 700; color: var(--exam-text-sm); margin-right: 4px; }
.nu-share-btn {
    padding: 7px 16px; border-radius: 999px;
    font-size: 13px; font-weight: 700; text-decoration: none;
    border: 1.5px solid; transition: all .15s; white-space: nowrap;
}
.nu-share-twitter  { background: #e7f5fe; color: #0c8de4; border-color: #bde3f9; }
.nu-share-twitter:hover  { background: #0c8de4; color: #fff; }
.nu-share-linkedin { background: #e8f2fb; color: #0a66c2; border-color: #b3d1f0; }
.nu-share-linkedin:hover { background: #0a66c2; color: #fff; }
.nu-share-whatsapp { background: #e9faea; color: #25d366; border-color: #a7e8b3; }
.nu-share-whatsapp:hover { background: #25d366; color: #fff; }
body.nu-dark .nu-share-bar { background: #1e293b; border-color: #334155; }

/* ══════════════════════════════════════════════════════════
   WEAK DOMAIN RECOMMENDATIONS
   ══════════════════════════════════════════════════════════ */
.nu-weak-domains {
    background: var(--exam-surface); border: 1.5px solid #fde68a;
    border-left: 4px solid #f59e0b;
    border-radius: 14px; padding: 18px 20px; margin-bottom: 16px;
}
body.nu-dark .nu-weak-domains { background: #1e293b; border-color: #78350f; }
.nu-weak-title {
    font-size: 13px; font-weight: 800; color: #92400e;
    text-transform: uppercase; letter-spacing: .5px; margin-bottom: 14px;
}
body.nu-dark .nu-weak-title { color: #fbbf24; }
.nu-weak-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 0; border-bottom: 1px solid #fef3c7; gap: 12px;
}
body.nu-dark .nu-weak-item { border-color: #292524; }
.nu-weak-item:last-child { border-bottom: none; padding-bottom: 0; }
.nu-weak-info { display: flex; flex-direction: column; gap: 2px; }
.nu-weak-domain { font-size: 14px; font-weight: 600; color: var(--exam-text); }
.nu-weak-score { font-size: 12px; color: var(--exam-red); font-weight: 600; }
.nu-weak-link {
    font-size: 12px; font-weight: 700; color: var(--exam-teal);
    text-decoration: none; white-space: nowrap;
    padding: 5px 12px; border: 1.5px solid #80cbc4;
    border-radius: 999px; transition: all .15s;
}
.nu-weak-link:hover { background: var(--exam-teal); color: #fff; border-color: var(--exam-teal); }

/* ══════════════════════════════════════════════════════════
   LEADERBOARD SCREEN
   ══════════════════════════════════════════════════════════ */
.nu-lb-wrap { max-width: 640px; margin: 0 auto; padding: 24px 16px; }
.nu-lb-header { margin-bottom: 4px; }
.nu-lb-title { font-size: 22px; font-weight: 900; color: var(--exam-text); margin-bottom: 14px; }
.nu-lb-tabs {
    display: flex; gap: 6px; background: var(--exam-bg);
    padding: 4px; border-radius: 10px; margin-bottom: 20px; width: fit-content;
}
.nu-lb-tab {
    padding: 7px 16px; border-radius: 8px; border: none;
    background: transparent; font-size: 13px; font-weight: 600;
    color: var(--exam-text-sm); cursor: pointer; transition: all .15s;
}
.nu-lb-tab.active { background: var(--exam-teal); color: #fff; box-shadow: 0 2px 8px rgba(0,150,136,.3); }
.nu-lb-list { display: flex; flex-direction: column; gap: 8px; }
.nu-lb-row {
    display: flex; align-items: center; gap: 12px;
    background: var(--exam-surface); border: 1.5px solid var(--exam-border);
    border-radius: 14px; padding: 12px 16px;
    transition: box-shadow .15s;
}
.nu-lb-row:hover { box-shadow: var(--exam-shadow-sm); }
.nu-lb-row-me { border-color: var(--exam-teal); background: var(--exam-teal-lt); }
body.nu-dark .nu-lb-row-me { background: rgba(0,150,136,.1); }
.nu-lb-rank { font-size: 20px; min-width: 32px; text-align: center; font-weight: 800; color: var(--exam-text-xs); }
.nu-lb-avatar { width: 36px; height: 36px; border-radius: 50%; border: 2px solid var(--exam-border); }
.nu-lb-name { flex: 1; font-size: 14px; font-weight: 700; color: var(--exam-text); display: flex; align-items: center; gap: 6px; }
.nu-lb-you { font-size: 10px; background: var(--exam-teal); color: #fff; padding: 2px 8px; border-radius: 999px; font-weight: 700; }
.nu-lb-score { font-size: 18px; font-weight: 900; color: var(--exam-teal); min-width: 52px; text-align: right; }
.nu-lb-meta { font-size: 11px; color: var(--exam-text-xs); min-width: 60px; text-align: right; }
.nu-lb-empty { text-align: center; padding: 48px 24px; color: var(--exam-text-sm); font-size: 15px; }

/* Refer to Exhibit */
.nu-exhibit-wrap{margin:0 0 18px;padding:12px;border:1px solid rgba(127,127,127,.22);border-radius:12px;background:rgba(127,127,127,.06);text-align:center}.nu-exhibit-label{font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.04em;margin-bottom:10px;opacity:.8}.nu-exhibit-image{display:block;max-width:100%;height:auto;max-height:620px;margin:0 auto;border-radius:8px}


/* ══════════════════════════════════════════════════════════
   THEME CONFLICT OVERRIDES — CONFIG HERO CONTRAST
   Astra/child-theme global heading rules must not override the
   exam hero's light text on its dark gradient background.
   ══════════════════════════════════════════════════════════ */
#nu-exam-app .nu-exam-hero h1,
#nu-exam-app .nu-exam-hero h1.wp-block-heading {
    color: #ffffff !important;
    text-shadow: 0 2px 10px rgba(0,0,0,.22);
}
#nu-exam-app .nu-exam-hero p {
    color: #b2dfdb !important;
}
#nu-exam-app .nu-exam-hero .nu-hero-pill {
    color: #b2dfdb !important;
}
#nu-exam-app .nu-exam-hero .nu-hero-pill strong,
#nu-exam-app .nu-exam-hero .nu-hero-pill b {
    color: #ffffff !important;
}

/* Keep config-screen text readable if a site-wide dark/light rule
   changes inherited colors. */
#nu-exam-app .nu-config-card .nu-config-label-text {
    color: var(--exam-text) !important;
}
#nu-exam-app .nu-config-card .nu-config-label-hint {
    color: var(--exam-text-sm) !important;
}
#nu-exam-app .nu-config-card .nu-pill:not(.active) {
    color: var(--exam-text-sm) !important;
}
#nu-exam-app .nu-config-card .nu-select {
    color: var(--exam-text) !important;
}

/* Dark mode: config surfaces switch together with their text. */
body.nu-dark #nu-exam-app .nu-config-card .nu-config-label-text {
    color: #e2e8f0 !important;
}
body.nu-dark #nu-exam-app .nu-config-card .nu-config-label-hint {
    color: #94a3b8 !important;
}
body.nu-dark #nu-exam-app .nu-config-card .nu-pill:not(.active) {
    color: #cbd5e1 !important;
}
body.nu-dark #nu-exam-app .nu-config-card .nu-select {
    color: #e2e8f0 !important;
}

/* ================================================================
   NU PRACTICE EXAM v2.4 — MODERN TEST / QUIZ / EXAM EXPERIENCE
   Applies to configuration, active exam, review/results and leaderboard.
   ================================================================ */
#nu-exam-app {
  --nu24-ink:#0f172a;
  --nu24-muted:#64748b;
  --nu24-line:#dbe4ee;
  --nu24-surface:#ffffff;
  --nu24-soft:#f7fafc;
  --nu24-teal:#0f9d8f;
  --nu24-teal-dark:#08786d;
  max-width:1120px;
  margin:0 auto;
  padding:0 18px 72px;
}
#nu-exam-app .nu-exam-hero {
  margin:0 -18px 20px;
  border-radius:0 0 30px 30px;
  padding:64px 28px 48px;
  background:
    radial-gradient(circle at 12% 15%,rgba(45,212,191,.18),transparent 30%),
    radial-gradient(circle at 88% 20%,rgba(59,130,246,.16),transparent 28%),
    linear-gradient(135deg,#071522 0%,#0b2635 48%,#073c3a 100%);
  box-shadow:0 20px 45px rgba(2,18,32,.18);
}
#nu-exam-app .nu-exam-hero-icon {font-size:62px;margin-bottom:12px}
#nu-exam-app .nu-exam-hero h1 {font-size:clamp(28px,4vw,46px);letter-spacing:-.035em}
#nu-exam-app .nu-exam-hero p {font-size:16px;color:#b8e7e2!important}
#nu-exam-app .nu-hero-pills {gap:8px}
#nu-exam-app .nu-hero-pill {background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.14);color:#d8fffb!important;backdrop-filter:blur(8px)}
#nu-exam-app .nu-topbar {
  max-width:1040px;margin:0 auto 14px;padding:10px 14px;
  display:flex;justify-content:space-between;align-items:center;gap:10px;
  background:rgba(255,255,255,.88);border:1px solid var(--nu24-line);border-radius:16px;
  box-shadow:0 6px 24px rgba(15,23,42,.05);backdrop-filter:blur(12px);
}
#nu-exam-app .nu-config-card {
  max-width:1040px;margin:0 auto;padding:8px 30px 28px;border-radius:24px;
  box-shadow:0 18px 45px rgba(15,23,42,.08);border-color:#dfe7ef;
}
#nu-exam-app .nu-config-row {padding:22px 0}
#nu-exam-app .nu-config-label-text {font-size:16px}
#nu-exam-app .nu-pill {min-width:62px;text-align:center}
#nu-exam-app .nu-btn-primary {box-shadow:0 10px 25px rgba(0,150,136,.22)}
#nu-exam-app .nu-proctor-note {text-align:center;margin:12px 0 0;color:#64748b}

/* Active test: desktop reading canvas */
#nu-exam-app #nu-screen-exam {max-width:1040px;margin:0 auto}
#nu-exam-app .nu-exam-header {
  top:0;margin:0 -18px;padding:12px 22px;z-index:50;
  border:1px solid rgba(203,213,225,.9);border-left:0;border-right:0;
  box-shadow:0 7px 24px rgba(15,23,42,.07);
}
#nu-exam-app .nu-exam-progress-wrap {gap:14px}
#nu-exam-app .nu-exam-q-counter {padding:7px 12px;background:#eef7f6;color:#08786d;border-color:#c9e8e4}
#nu-exam-app .nu-exam-progress-bar {height:8px;background:#e8eef4}
#nu-exam-app .nu-timer {padding:9px 16px;background:#fff;border-color:#dbe4ee;box-shadow:0 3px 10px rgba(15,23,42,.04)}
#nu-exam-app .nu-question-wrap {padding:28px 0 12px}
#nu-exam-app .nu-question-card {
  max-width:920px;margin:0 auto;padding:34px 38px;border-radius:24px;
  box-shadow:0 18px 50px rgba(15,23,42,.08);border-color:#dce5ee;
}
#nu-exam-app .nu-q-meta {margin-bottom:20px}
#nu-exam-app .nu-q-domain {background:#eaf8f6;color:#08786d;border:1px solid #c8e8e3}
#nu-exam-app .nu-q-text {font-size:20px;line-height:1.7;letter-spacing:-.01em}
#nu-exam-app .nu-option-item {
  min-height:64px;padding:14px 18px;border-radius:16px;background:#fff;
  border-color:#d9e2eb;box-shadow:0 2px 7px rgba(15,23,42,.025);
}
#nu-exam-app .nu-option-item:hover {border-color:#79cfc5;transform:translateY(-1px);box-shadow:0 8px 20px rgba(15,23,42,.06)}
#nu-exam-app .nu-option-item.selected {border-color:#0f9d8f;box-shadow:0 8px 22px rgba(15,157,143,.12)}
#nu-exam-app .nu-opt-letter {width:36px;height:36px;border-radius:11px}
#nu-exam-app .nu-opt-text {font-size:15px}
#nu-exam-app .nu-exhibit-wrap {padding:18px;border-radius:18px;background:#f8fbfc;border-color:#dbe7ea}
#nu-exam-app .nu-exhibit-label {color:#0f766e}
#nu-exam-app .nu-exhibit-image {max-height:560px;box-shadow:0 12px 30px rgba(15,23,42,.08)}
#nu-exam-app .nu-exam-nav {
  max-width:920px;margin:0 auto;padding:18px 0;background:transparent;border:0;
}
#nu-exam-app .nu-q-dots-wrap {
  max-width:920px;margin:0 auto;padding:18px 20px;border:1px solid #dfe7ef;
  border-radius:18px;background:#fff;box-shadow:0 8px 24px rgba(15,23,42,.045)
}
#nu-exam-app .nu-dot {width:34px;height:34px;border-radius:9px}
#nu-exam-app .nu-exam-submit-wrap {max-width:920px;margin:0 auto;padding:18px 0 0}

/* Loading / submitting */
#nu-exam-app .nu-loading-wrap {
  min-height:55vh;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:linear-gradient(180deg,#fff,#f6fafb);border:1px solid #e0e8ef;border-radius:24px;
  margin-top:24px;box-shadow:0 18px 50px rgba(15,23,42,.06)
}
#nu-exam-app .nu-loading-wrap p {font-weight:600;color:#475569}

/* Results / quiz review */
#nu-exam-app .nu-result-wrap {max-width:920px;padding:32px 0}
#nu-exam-app .nu-score-card {
  padding:56px 36px;border-radius:28px;box-shadow:0 22px 60px rgba(7,35,48,.25)
}
#nu-exam-app .nu-score-pct {font-size:clamp(64px,10vw,92px)}
#nu-exam-app .nu-score-detail {color:#cbd5e1}
#nu-exam-app .nu-domain-breakdown,
#nu-exam-app .nu-review-item {border-radius:20px;box-shadow:0 8px 28px rgba(15,23,42,.05)}
#nu-exam-app .nu-review-item {padding:22px}
#nu-exam-app .nu-review-q {font-size:15px}
#nu-exam-app .nu-review-exp {background:#f7fafc}
#nu-exam-app .nu-result-actions {padding:4px 0 14px}

/* Leaderboard / test history */
#nu-exam-app #nu-leaderboard-wrap {max-width:920px;margin:28px auto}
#nu-exam-app .nu-lb-row {padding:15px 18px;border-radius:16px}

/* Dark mode refinements */
body.nu-dark #nu-exam-app .nu-topbar,
body.nu-dark #nu-exam-app .nu-exam-header,
body.nu-dark #nu-exam-app .nu-q-dots-wrap,
body.nu-dark #nu-exam-app .nu-loading-wrap {background:rgba(15,23,42,.92);border-color:#334155}
body.nu-dark #nu-exam-app .nu-question-card,
body.nu-dark #nu-exam-app .nu-option-item {background:#111c2e;border-color:#334155}
body.nu-dark #nu-exam-app .nu-option-item:hover {border-color:#3aa99f}
body.nu-dark #nu-exam-app .nu-q-text,
body.nu-dark #nu-exam-app .nu-opt-text {color:#e2e8f0}
body.nu-dark #nu-exam-app .nu-exhibit-wrap {background:#0b1524;border-color:#334155}
body.nu-dark #nu-exam-app .nu-exam-nav {background:transparent}
body.nu-dark #nu-exam-app .nu-exam-progress-bar {background:#334155}
body.nu-dark #nu-exam-app .nu-timer {background:#111c2e;border-color:#334155;color:#e2e8f0}
body.nu-dark #nu-exam-app .nu-domain-breakdown,
body.nu-dark #nu-exam-app .nu-review-item {background:#111c2e;border-color:#334155}
body.nu-dark #nu-exam-app .nu-review-exp {background:#0b1524;border-color:#334155}

@media (max-width: 760px) {
  #nu-exam-app {padding:0 10px 48px}
  #nu-exam-app .nu-exam-hero {margin:0 -10px 14px;padding:44px 18px 34px;border-radius:0 0 24px 24px}
  #nu-exam-app .nu-topbar {flex-wrap:wrap;margin-bottom:10px}
  #nu-exam-app .nu-config-card {padding:6px 16px 22px}
  #nu-exam-app .nu-exam-header {margin:0 -10px;padding:10px 12px}
  #nu-exam-app .nu-question-card {padding:22px 16px;border-radius:18px}
  #nu-exam-app .nu-q-text {font-size:17px}
  #nu-exam-app .nu-exam-nav {gap:8px}
  #nu-exam-app .nu-exam-nav .nu-btn {flex:1}
  #nu-exam-app .nu-score-card {padding:40px 22px;border-radius:22px}
}