#treeImage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: center center;
    transform: translate(-50%, -50%);
    user-select: none;
    -webkit-user-drag: none;
    will-change: transform;
    max-width: none;
    max-height: none;
    /* تغيير الشفافية الافتراضية إلى 1 لضمان الظهور */
    opacity: 1; 
    transition: transform 0.1s linear; /* إزالة الترانزيشن البطيء للتحميل */
    /* ظل ناعم للصورة */
    box-shadow: 0 10px 60px rgba(93, 64, 55, 0.15);
    border-radius: 4px;
}

/* لم نعد بحاجة لهذا الكلاس للإظهار، الصورة ظاهرة افتراضياً */
/* #treeImage.loaded { opacity: 1; } */ 

/* --- باقي التنسيقات كما هي --- */
:root {
    --primary-dark: #5D4037;
    --primary-light: #8D6E63;
    --accent-color: #C5A059;
    --bg-color: #F9F7F2;
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: 1px solid rgba(255, 255, 255, 0.6);
}

html {
    height: 100%;
    background-color: var(--bg-color);
}

body {
    background-color: var(--bg-color);
    font-family: 'Cairo', sans-serif;
    overflow: hidden;
    height: 100vh;
    min-height: 100vh;
    width: 100%;
    margin: 0;
    overscroll-behavior: none;
}

@supports (height: 100dvh) {
    body {
        height: 100dvh;
    }
}

.font-amiri { font-family: 'Amiri', serif; }
.font-cairo { font-family: 'Cairo', sans-serif; }
.text-primary-dark { color: var(--primary-dark); }
.text-accent { color: var(--accent-color); }
.bg-cream { background-color: var(--bg-color); }

/* --- الهيدر الزجاجي --- */
.glass-nav {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--glass-border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0.8rem 0;
}

.btn-outline-primary {
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}
.btn-outline-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

body.zoomed .glass-nav {
    transform: translateY(-100%);
}

/* --- منطقة العرض --- */
#viewer-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-height: 100%;
    z-index: 1;
    overflow: hidden;
    background-color: var(--bg-color);
}

@supports (height: 100dvh) {
    #viewer-container {
        height: 100dvh;
    }
}

body.is-android {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
}

body.is-android .glass-nav {
    position: relative;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: none;
    border-bottom: none;
    margin-bottom: 0.25rem;
}

body.is-android.zoomed .glass-nav {
    transform: none !important;
    opacity: 1 !important;
}

body.is-android #viewer-container {
    position: relative;
    flex: 1;
    width: 100%;
    height: auto;
    min-height: 0;
}

@supports (height: 100dvh) {
    body.is-android #viewer-container {
        height: auto;
    }
}

body.is-android .controls-group {
    position: relative;
    order: 3;
    margin: 0 auto 1rem;
    width: min(500px, 94%);
    gap: 0.5rem;
    left: 0;
    bottom: auto;
    transform: none;
}

#canvas {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: grab;
    touch-action: none;
}
#canvas:active { cursor: grabbing; }

/* --- أدوات التحكم --- */
.controls-group {
    position: absolute;
    bottom: max(1.25rem, calc(env(safe-area-inset-bottom, 0px) + 1rem));
    left: 2.25rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.65rem;
    border-radius: 56px;
    transition: opacity 0.3s;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.btn-ctrl {
    width: 48px;
    height: 48px;
    border: none;
    background: transparent;
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn-ctrl:hover {
    background-color: rgba(93, 64, 55, 0.1);
    transform: scale(1.15);
    color: var(--accent-color);
}

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

/* --- شاشة التحميل --- */
.loader-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-color);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s;
}
.loader-overlay.hidden { opacity: 0; pointer-events: none; }

/* --- الموبايل --- */
@media (max-width: 900px) {
    body:not(.is-android) .controls-group {
        left: 50%;
        transform: translateX(-50%);
        bottom: max(0.85rem, calc(env(safe-area-inset-bottom, 0px) + 0.8rem));
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 0.5rem;
        width: min(420px, 92%);
        padding: 0.55rem 1.2rem;
        border-radius: 999px;
    }
    body:not(.is-android) .controls-group hr {
        display: none;
    }
    .btn-ctrl {
        width: 52px;
        height: 52px;
    }
    body.is-android .controls-group {
        width: min(500px, 94%);
        gap: 0.45rem;
    }
    .navbar-brand .h4 { font-size: 1.2rem; }
}