:root {
    --primary-color: #0f2b48;
    --primary-light: #1a365d;
    --accent-color: #d69e2e;
    --accent-hover: #f6e05e;
    --sub-bg-desktop: #1e293b;
    --sub-bg-mobile: #09192b;
}

nav { 
    background: var(--primary-color); 
    color: white; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 12px 30px; 
    position: sticky; 
    top: 0; 
    z-index: 1000; 
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); 
    font-family: 'Padauk', 'Pyidaungsu', 'Myanmar Text', sans-serif;
}

.logo { 
    font-size: 20px; 
    font-weight: bold; 
    color: var(--accent-color); 
    text-decoration: none; 
    display: flex;
    align-items: center;
    gap: 12px;
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 0.9;
}

/* Nav Menu Main UL */
.nav-links { 
    display: flex; 
    gap: 10px; 
    list-style: none; 
    margin: 0; 
    padding: 0; 
    align-items: center; 
}

/* Parent LI */
.nav-links > li {
    position: relative;
    list-style: none;
}

.nav-links a { 
    color: #edf2f7; 
    text-decoration: none; 
    font-size: 15px; 
    font-weight: 500; 
    transition: all 0.3s ease; 
    padding: 8px 14px; 
    border-radius: 6px; 
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a:hover, 
.nav-links a.active { 
    background: rgba(255, 255, 255, 0.08); 
    color: var(--accent-color); 
}

/* 💻 Sub-menu (.sub) Desktop Design */
.nav-links .sub {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background-color: var(--sub-bg-desktop); 
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    list-style: none;
    padding: 6px 0;
    margin: 0;
    z-index: 1000;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-links .sub li {
    width: 100%;
}

.nav-links .sub li a {
    padding: 10px 18px;
    font-size: 14px;
    color: #cbd5e0;
    border-radius: 0;
    width: 100%;
    box-sizing: border-box;
}

.nav-links .sub li a:hover {
    background-color: var(--primary-light);
    color: var(--accent-hover);
}

/* Sub-menu Display Trigger */
.nav-links li:hover > .sub,
.nav-links li:focus-within > .sub {
    display: block;
    animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Toggle Icon */
.menu-toggle { 
    display: none; 
    font-size: 24px; 
    cursor: pointer; 
    color: var(--accent-color); 
    z-index: 1001;
    user-select: none;
    transition: transform 0.2s ease;
}

.menu-toggle:hover {
    transform: scale(1.1);
}

/* 📱 Responsive Design for Mobile */
@media (max-width: 768px) {
    nav {
        padding: 12px 20px;
    }

    .nav-links { 
        display: none; 
        flex-direction: column; 
        width: 100%; 
        position: absolute; 
        top: 100%; 
        left: 0; 
        background: var(--primary-color); 
        padding: 10px 0 20px 0; 
        text-align: left; 
        box-shadow: 0 8px 15px rgba(0,0,0,0.3); 
        gap: 0;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-links.active { 
        display: flex; 
    }

    .nav-links > li {
        width: 100%; /* ဖုန်းထဲတွင် မီနူးအပြည့် ပေါ်စေရန် 100% ပြောင်းထားသည် */
    }

    .nav-links a {
        padding: 14px 25px;
        border-radius: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }

    /* ဖုန်းတွင် Dropdown ကို အောက်သို့ လျှောဆင်းစေခြင်း */
    .nav-links .sub {
        position: static;
        box-shadow: none;
        background-color: var(--sub-bg-mobile);
        border-radius: 0;
        padding: 0;
        width: 100%;
        border: none;
    }

    .nav-links .sub li a {
        padding-left: 45px; /* Sub-menu အဆင့်ကို ပိုမို သိသာအောင် ပြုလုပ်ခြင်း */
        font-size: 14px;
    }

    .menu-toggle { 
        display: block; 
    }
}