/* ==========================================================================
   MathMaster - لعبة ملك الجداول (Multiplication Table Duel)
   شاشة مقسومة للاعبين، النصف العلوي مقلوب 180°، خط نيون فاصل
   ========================================================================== */

#duel-screen {
    display: flex;
    flex-direction: column;
    background-color: #06070A;
    position: relative;
    overflow: hidden;
}

/* نصف اللاعب */
.duel-half {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 18px;
    gap: 22px;
    transition: background-color 0.1s ease;
    position: relative;
}

/* النصف العلوي (اللاعب 1) مقلوب 180 درجة ليواجه الخصم */
#duel-half-p1 {
    transform: rotate(180deg);
    background: linear-gradient(180deg, #14101f, #0a0813);
}

/* النصف السفلي (اللاعب 2) بالاتجاه الطبيعي */
#duel-half-p2 {
    background: linear-gradient(180deg, #0a0813, #0d141f);
}

/* وميض الفوز/الخسارة لكل نصف على حدة */
.duel-half.flash-win {
    animation: duelFlashWin 0.35s ease;
}

.duel-half.flash-lose {
    animation: duelFlashLose 0.35s ease;
}

@keyframes duelFlashWin {
    0% { background-color: rgba(46, 204, 113, 0.4); }
    100% { background-color: transparent; }
}

@keyframes duelFlashLose {
    0% { background-color: rgba(231, 76, 60, 0.4); }
    100% { background-color: transparent; }
}

/* الخط الفاصل النيوني في المنتصف */
.duel-divider {
    height: 3px;
    width: 100%;
    background: linear-gradient(90deg, transparent, #DEFF9A, #2ECC71, #DEFF9A, transparent);
    box-shadow: 0 0 14px rgba(222, 255, 154, 0.7), 0 0 28px rgba(46, 204, 113, 0.4);
    flex-shrink: 0;
    position: relative;
    z-index: 5;
    animation: neonPulse 2s ease-in-out infinite;
}

@keyframes neonPulse {
    0%, 100% { opacity: 0.85; }
    50% { opacity: 1; }
}

/* شارة اسم اللاعب + النتيجة */
.duel-player-header {
    display: flex;
    align-items: center;
    gap: 14px;
}

.duel-player-name {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
}

.duel-score {
    font-family: var(--font-display);
    font-size: 30px;
    font-weight: 900;
    color: var(--color-accent);
    min-width: 42px;
    text-align: center;
    text-shadow: 0 0 14px rgba(222, 255, 154, 0.4);
}

#duel-half-p1 .duel-score { color: #C9A6FF; text-shadow: 0 0 14px rgba(155, 89, 255, 0.5); }
#duel-half-p2 .duel-score { color: #DEFF9A; }

/* المعادلة */
.duel-equation {
    font-family: var(--font-display);
    font-size: clamp(32px, 9vw, 52px);
    font-weight: 900;
    color: var(--color-text-main);
    direction: ltr;
    text-align: center;
}

/* خيارات الإجابة (3 أزرار) */
.duel-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: min(92vw, 440px);
}

.duel-option-btn {
    padding: 18px 8px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    color: var(--color-text-main);
    font-family: var(--font-display);
    font-size: clamp(24px, 6vw, 32px);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.12s ease;
}

.duel-option-btn:active {
    transform: scale(0.93);
}

#duel-half-p1 .duel-option-btn:hover { border-color: #C9A6FF; }
#duel-half-p2 .duel-option-btn:hover { border-color: #DEFF9A; }

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

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

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

/* زر التحكم العائم (عودة + مساعدة) في منتصف الخط الفاصل */
.duel-controls {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    display: flex;
    gap: 10px;
}

.duel-ctrl-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(6, 7, 10, 0.9);
    border: 1px solid rgba(222, 255, 154, 0.3);
    color: var(--color-text-main);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.duel-ctrl-btn:hover {
    border-color: var(--color-accent);
    transform: scale(1.1);
}

/* --------------------------------------------------------------------------
   البطاقات المنبثقة (الفوز / الشرح)
   -------------------------------------------------------------------------- */
.duel-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;
}

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

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

.duel-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);
}

.duel-card.winner-p1 {
    border-color: #C9A6FF;
    box-shadow: 0 20px 60px rgba(155, 89, 255, 0.35);
}

.duel-card.winner-p2 {
    border-color: #DEFF9A;
}

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

.duel-card-icon {
    font-size: 64px;
    margin-bottom: 12px;
    animation: bounceIcon 0.6s ease;
}

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

.duel-card-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 900;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.duel-card.winner-p1 .duel-card-title { color: #C9A6FF; }

.duel-card-sub {
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

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

.duel-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;
}

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

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

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

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

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

.duel-support {
    text-align: center;
    font-size: 11px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-top: 14px;
}

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