/* ==========================================================================
   MathMaster - لعبة لغز الإشارة المفقودة (Find the Sign)
   مظهر داكن + مربعات نيون مشعة + لوحة إشارات + وميض أخضر/أحمر
   ========================================================================== */

#sign-screen {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

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

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

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

.sign-hud {
    display: flex;
    gap: 18px;
    align-items: center;
}

.sign-level-badge {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    color: var(--color-accent);
    background-color: var(--bg-button);
    padding: 6px 14px;
    border-radius: 20px;
}

.sign-score-badge {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text-muted);
}

/* منطقة اللعب */
.sign-play-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    gap: 40px;
}

.sign-hint-text {
    font-size: 14px;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 360px;
}

/* المعادلة */
.sign-equation {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    direction: ltr;
    font-family: var(--font-display);
    border-radius: 16px;
    padding: 16px;
    transition: background-color 0.1s ease;
}

.sign-equation.flash-green {
    animation: signFlashGreen 0.5s ease;
}

.sign-equation.flash-red {
    animation: signFlashRed 0.5s ease;
}

@keyframes signFlashGreen {
    0% { background-color: rgba(46, 204, 113, 0.35); }
    100% { background-color: transparent; }
}

@keyframes signFlashRed {
    0% { background-color: rgba(231, 76, 60, 0.35); }
    100% { background-color: transparent; }
}

.sign-num,
.sign-equals,
.sign-result {
    font-size: clamp(34px, 9vw, 52px);
    font-weight: 900;
    color: var(--color-text-main);
}

.sign-result {
    color: var(--color-accent);
    text-shadow: 0 0 18px rgba(222, 255, 154, 0.4);
}

.sign-equals {
    color: var(--color-text-muted);
}

/* المربعات الفارغة [?] بلون نيون مشع */
.sign-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: clamp(46px, 12vw, 64px);
    height: clamp(46px, 12vw, 64px);
    font-size: clamp(28px, 7vw, 40px);
    font-weight: 900;
    color: var(--color-accent);
    background-color: rgba(222, 255, 154, 0.06);
    border: 2px dashed rgba(222, 255, 154, 0.5);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 0 14px rgba(222, 255, 154, 0.2);
    animation: slotPulse 1.8s ease-in-out infinite;
}

@keyframes slotPulse {
    0%, 100% { box-shadow: 0 0 12px rgba(222, 255, 154, 0.18); }
    50% { box-shadow: 0 0 22px rgba(222, 255, 154, 0.4); }
}

.sign-slot.filled {
    color: var(--bg-primary);
    background-color: var(--color-accent);
    border-style: solid;
    border-color: var(--color-accent);
    animation: none;
}

/* لوحة أزرار الإشارات */
.sign-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    width: min(92vw, 420px);
    flex-shrink: 0;
    padding-bottom: 24px;
}

.sign-op-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(28px, 8vw, 40px);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
}

.sign-op-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.sign-op-btn:active {
    transform: scale(0.92);
    background-color: rgba(222, 255, 154, 0.12);
}

/* --------------------------------------------------------------------------
   البطاقات المنبثقة (نجاح / شرح)
   -------------------------------------------------------------------------- */
.sign-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;
}

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

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

.sign-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);
}

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

.sign-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); }
}

.sign-card-title {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 900;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.sign-card-msg {
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.sign-card-points {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 900;
    color: var(--color-text-main);
    margin-bottom: 24px;
}

.sign-card-points span {
    color: var(--color-accent);
}

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

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

.sign-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;
}

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

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

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

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

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

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