/* ==========================================================================
   MathMaster - لعبة الميزان الرياضي (Math Balance)
   تصميم Dark Mode متناسق مع روح التطبيق + ميزان متأرجح ديناميكي
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. شريط التنقل العلوي
   -------------------------------------------------------------------------- */
#balance-screen {
    display: flex;
    flex-direction: column;
}

.balance-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background-color: var(--bg-card);
    border-bottom: 1px solid rgba(222, 255, 154, 0.08);
    flex-shrink: 0;
}

.balance-navbar .nav-back-btn,
.balance-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;
}

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

.balance-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.balance-meta .badge {
    background-color: var(--bg-button);
    color: var(--color-accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
}

#balance-timer,
#balance-progress {
    font-family: var(--font-display);
    font-size: 14px;
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   2. منطقة اللعب والميزان
   -------------------------------------------------------------------------- */
.balance-play-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    gap: 24px;
    overflow: hidden;
}

/* حاوية الميزان بالكامل */
.scale-wrapper {
    width: min(92vw, 460px);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    animation: scaleFadeIn 0.6s ease;
}

@keyframes scaleFadeIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.9); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* العارضة المتأرجحة (Beam) */
.scale-beam {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    transform-origin: center center;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    /* وضع البداية: ميل بسيط دلالة على عدم التوازن */
    transform: rotate(-4deg);
}

.scale-beam.balanced {
    transform: rotate(0deg);
}

.scale-beam.tilt-left {
    /* ترجح الكفة الثابتة (اليمنى في الترتيب البصري) للدلالة على الخطأ */
    animation: shakeBeam 0.6s ease;
    transform: rotate(7deg);
}

.scale-beam.tilt-right {
    transform: rotate(-7deg);
}

@keyframes shakeBeam {
    0%, 100% { transform: rotate(7deg); }
    25% { transform: rotate(4deg); }
    50% { transform: rotate(9deg); }
    75% { transform: rotate(5deg); }
}

/* العمود الأفقي الواصل بين الكفتين */
.scale-beam::before {
    content: "";
    position: absolute;
    top: 18px;
    left: 8%;
    right: 8%;
    height: 6px;
    background: linear-gradient(90deg, #2A3540, #3a4a5a, #2A3540);
    border-radius: 3px;
    z-index: 0;
}

/* كل كفة */
.scale-pan {
    position: relative;
    width: 42%;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

/* الحبل الواصل بين العارضة والطبق */
.pan-rope {
    width: 2px;
    height: 36px;
    background: linear-gradient(180deg, #3a4a5a, #2A3540);
    margin-top: 18px;
}

/* الطبق الذي يحمل المعادلة */
.pan-dish {
    width: 100%;
    min-height: 92px;
    background-color: var(--bg-card);
    border: 2px solid rgba(222, 255, 154, 0.15);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.scale-pan.fixed .pan-dish {
    border-color: rgba(160, 170, 181, 0.25);
}

.scale-pan.partial .pan-dish {
    border-color: rgba(222, 255, 154, 0.3);
    box-shadow: 0 0 24px rgba(222, 255, 154, 0.12);
}

/* المعادلات داخل الأطباق */
.equation {
    font-family: var(--font-display);
    font-size: clamp(24px, 7vw, 38px);
    font-weight: 900;
    color: var(--color-text-main);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 6px;
    text-align: center;
    white-space: nowrap;
    direction: ltr; /* عرض المعادلات من اليسار إلى اليمين بشكل رياضي صحيح */
}

/* المربع الفارغ للإجابة */
.answer-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    height: 48px;
    padding: 0 8px;
    border: 2px dashed var(--color-accent);
    border-radius: 12px;
    color: var(--color-accent);
    background-color: rgba(222, 255, 154, 0.06);
    transition: all 0.3s ease;
}

.answer-slot.filled {
    border-style: solid;
}

.answer-slot.correct-fill {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
    animation: popIn 0.4s ease;
}

@keyframes popIn {
    0% { transform: scale(0.6); }
    60% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* قاعدة الميزان والركيزة المثلثية */
.scale-base {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: -2px;
}

.scale-pivot {
    width: 0;
    height: 0;
    border-left: 26px solid transparent;
    border-right: 26px solid transparent;
    border-bottom: 60px solid #2A3540;
}

.scale-stand {
    width: 120px;
    height: 14px;
    background: linear-gradient(90deg, #1E2630, #2A3540, #1E2630);
    border-radius: 7px;
    margin-top: -4px;
}

/* مؤشر الحالة (يتحول أخضر عند التوازن) */
.balance-status {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text-muted);
    min-height: 22px;
    transition: color 0.3s ease;
}

/* --------------------------------------------------------------------------
   3. لوحة خيارات الأرقام
   -------------------------------------------------------------------------- */
.balance-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    width: min(92vw, 460px);
    flex-shrink: 0;
    padding-bottom: 8px;
}

.balance-option-btn {
    aspect-ratio: 1 / 1;
    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(22px, 6vw, 30px);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.balance-option-btn:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.balance-option-btn:active {
    transform: scale(0.94);
}

.balance-option-btn.correct {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
    box-shadow: 0 0 24px rgba(46, 204, 113, 0.5);
}

.balance-option-btn.wrong {
    background-color: var(--color-error);
    border-color: var(--color-error);
    color: #fff;
    animation: shakeBtn 0.4s ease;
}

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

/* --------------------------------------------------------------------------
   4. البطاقات المنبثقة (Modals)
   -------------------------------------------------------------------------- */
.balance-modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.8);
    -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;
}

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

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

/* بطاقة النجاح */
.balance-success-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, 0.3);
}

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

.balance-success-icon {
    font-size: 64px;
    margin-bottom: 16px;
    animation: bounceIcon 0.6s ease;
}

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

.balance-success-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.balance-success-message {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.balance-success-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 32px;
}

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

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

.balance-success-stats .stat-value {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-main);
}

.balance-success-actions {
    display: flex;
    gap: 12px;
}

.balance-success-btn {
    flex: 1;
    padding: 14px 20px;
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.balance-success-btn.secondary {
    background-color: var(--bg-button);
    color: var(--color-text-main);
    border: 1px solid rgba(250, 250, 250, 0.1);
}

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

/* بطاقة الشرح */
.balance-tutorial-card {
    background-color: var(--bg-card);
    border: 1px solid rgba(250, 250, 250, 0.1);
    border-radius: 20px;
    padding: 24px;
    width: 90%;
    max-width: 400px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

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

.balance-tutorial-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.balance-tutorial-header h2 {
    font-family: var(--font-display);
    font-size: 20px;
    color: var(--color-accent);
}

.balance-tutorial-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 24px;
    cursor: pointer;
}

.balance-tutorial-close:hover {
    color: var(--color-accent);
}

.balance-tutorial-body {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text-muted);
}

.balance-tutorial-body .highlight-eq {
    display: block;
    background-color: rgba(222, 255, 154, 0.1);
    border: 1px solid rgba(222, 255, 154, 0.2);
    border-radius: 12px;
    padding: 12px;
    margin-top: 14px;
    font-family: var(--font-display);
    font-size: 16px;
    color: var(--color-text-main);
    text-align: center;
}

.balance-support {
    margin-top: 18px;
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.6;
}

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