/* ==========================================================================
   MathMaster - لعبة تحدي الـ 60 ثانية (Math Blitz)
   عداد ضخم + معادلة سريعة + خيارات + وميض أخضر/أحمر حماسي
   ========================================================================== */

#blitz-screen {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    transition: background-color 0.1s ease;
}

/* وميض الخلفية عند الإجابة */
#blitz-screen.flash-green {
    animation: flashGreen 0.35s ease;
}

#blitz-screen.flash-red {
    animation: flashRed 0.35s ease;
}

@keyframes flashGreen {
    0% { background-color: rgba(46, 204, 113, 0.35); }
    100% { background-color: var(--bg-primary); }
}

@keyframes flashRed {
    0% { background-color: rgba(231, 76, 60, 0.35); }
    100% { background-color: var(--bg-primary); }
}

/* شريط التنقل */
.blitz-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    flex-shrink: 0;
}

.blitz-navbar .nav-back-btn,
.blitz-navbar .nav-help-btn {
    background: none;
    border: none;
    color: var(--color-text-main);
    font-size: 22px;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 12px;
    transition: all 0.2s ease;
}

.blitz-navbar .nav-back-btn:hover,
.blitz-navbar .nav-help-btn:hover {
    background-color: rgba(222, 255, 154, 0.1);
    transform: scale(1.1);
}

/* لوحة المعلومات (النقاط + عدد الحلول) */
.blitz-hud {
    display: flex;
    gap: 20px;
    align-items: center;
}

.blitz-hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.blitz-hud-label {
    font-size: 11px;
    color: var(--color-text-muted);
}

.blitz-hud-value {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 900;
    color: var(--color-accent);
}

/* منطقة اللعب */
.blitz-play-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    gap: 28px;
}

/* العداد التنازلي الضخم */
.blitz-timer {
    font-family: var(--font-display);
    font-size: clamp(72px, 26vw, 140px);
    font-weight: 900;
    line-height: 1;
    color: var(--color-text-main);
    text-shadow: 0 0 30px rgba(222, 255, 154, 0.25);
    transition: color 0.2s ease, transform 0.2s ease;
}

/* الثواني الأخيرة: أحمر نابض */
.blitz-timer.low {
    color: var(--color-error);
    animation: pulseTimer 1s ease-in-out infinite;
    text-shadow: 0 0 30px rgba(231, 76, 60, 0.5);
}

@keyframes pulseTimer {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.12); }
}

.blitz-timer-label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: -18px;
}

/* المعادلة */
.blitz-equation {
    font-family: var(--font-display);
    font-size: clamp(34px, 10vw, 56px);
    font-weight: 900;
    color: var(--color-accent);
    direction: ltr;
    text-align: center;
}

/* خيارات الإجابة */
.blitz-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    width: min(92vw, 460px);
    flex-shrink: 0;
    padding-bottom: 20px;
}

.blitz-option-btn {
    padding: 22px;
    background-color: var(--bg-button);
    border: 2px solid rgba(250, 250, 250, 0.08);
    border-radius: 18px;
    color: var(--color-text-main);
    font-family: var(--font-display);
    font-size: clamp(26px, 7vw, 36px);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
}

.blitz-option-btn:hover {
    border-color: var(--color-accent);
}

.blitz-option-btn:active {
    transform: scale(0.95);
}

.blitz-option-btn.correct {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
}

.blitz-option-btn.wrong {
    background-color: var(--color-error);
    border-color: var(--color-error);
    color: #fff;
    animation: shakeBlitz 0.3s ease;
}

@keyframes shakeBlitz {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* --------------------------------------------------------------------------
   البطاقات المنبثقة (Game Over / Tutorial)
   -------------------------------------------------------------------------- */
.blitz-modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.85);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.blitz-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.blitz-modal-overlay.hidden {
    display: none;
}

.blitz-card {
    background-color: var(--bg-card);
    border: 2px solid var(--color-accent);
    border-radius: 24px;
    padding: 32px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    transform: scale(0.8);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 60px rgba(222, 255, 154, 0.25);
}

.blitz-modal-overlay.active .blitz-card {
    transform: scale(1);
}

.blitz-card-icon {
    font-size: 60px;
    margin-bottom: 12px;
    animation: bounceIcon 0.6s ease;
}

@keyframes bounceIcon {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.blitz-card-title {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 900;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.blitz-final-stats {
    display: flex;
    justify-content: center;
    gap: 28px;
    margin-bottom: 24px;
}

.blitz-final-stats .stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.blitz-final-stats .stat-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.blitz-final-stats .stat-value {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 900;
    color: var(--color-text-main);
}

.blitz-final-stats .stat-value.highlight {
    color: var(--color-accent);
}

.blitz-card-actions {
    display: flex;
    gap: 12px;
}

.blitz-btn {
    flex: 1;
    padding: 14px 18px;
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.blitz-btn.primary {
    background-color: var(--color-accent);
    color: var(--bg-primary);
    border: none;
}

.blitz-btn.primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(222, 255, 154, 0.5);
}

.blitz-btn.secondary {
    background-color: var(--bg-button);
    color: var(--color-text-main);
    border: 1px solid rgba(250, 250, 250, 0.12);
}

.blitz-btn.secondary:hover {
    border-color: var(--color-accent);
}

.blitz-tutorial-body {
    font-size: 15px;
    line-height: 1.9;
    color: var(--color-text-muted);
    text-align: right;
    margin-bottom: 20px;
}

.blitz-support {
    text-align: center;
    font-size: 11px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-top: 12px;
}

.blitz-support a {
    color: var(--color-accent);
    text-decoration: none;
}