/* Top Left Navigation - Minimal Ins Style */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

img, video, canvas, svg, iframe {
    max-width: 100%;
    height: auto;
}

table {
    width: 100%;
    max-width: 100%;
    border-collapse: collapse;
}

/* Shared appearance styles - THE TRUTH SOURCE */
.top-nav-toggle, .lang-btn {
    z-index: 10001 !important; /* Ensure on top */
    font-size: 13px !important;
    cursor: pointer;
    background-color: rgba(255, 255, 255, 0.8); /* Reverted to default light */
    padding: 8px 18px !important;
    border-radius: 30px !important;
    border: 1px solid transparent;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    min-width: 98px !important;
    width: 98px !important;
    height: 38px !important;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: #4A4A4A; /* Reverted to default dark text */
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    white-space: nowrap !important;
    line-height: 1 !important;
    box-sizing: border-box !important;
    overflow: hidden;
}

/* Home Page Specific Overrides (Night Theme) */
.home-page .top-nav-toggle, 
.home-page .lang-btn {
    background-color: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #FFFFFF;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.home-page .top-nav-toggle:hover, 
.home-page .lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 6px 16px rgba(0,0,0,0.3);
    border-color: rgba(255, 255, 255, 0.4);
    color: #FFFFFF;
}

/* Positioning for Toggle Button - FIXED TO VIEWPORT */
.top-nav-toggle {
    position: fixed !important;
    top: 19px !important;
    left: 16px !important;
    margin: 0 !important;
}

/* Positioning for Language Switcher Container - FIXED TO VIEWPORT */
.language-switcher {
    position: fixed !important;
    top: 19px !important;
    right: 16px !important;
    z-index: 10001 !important;
    margin: 0 !important;
    width: auto !important;
    height: auto !important;
    transform: none !important;
}

/* Reset lang-btn positioning context */
.lang-btn {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    margin: 0 !important;
}

/* 滾動時的緊湊模式 (Compact Mode on Scroll) */
body.scrolled .top-nav-toggle, 
body.scrolled .lang-btn {
    min-width: 40px !important;
    width: 40px !important;
    height: 40px !important;
    padding: 0 !important;
    border-radius: 50% !important; /* 變為圓形圖標 */
    background-color: rgba(255, 255, 255, 0.95) !important; /* 確保背景不透明 */
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border: 1px solid rgba(0,0,0,0.05) !important; /* 微弱邊框增加可見度 */
}

body.scrolled .top-nav-toggle span, 
body.scrolled .lang-btn span {
    display: none !important; /* 隱藏文字 */
}

body.scrolled .top-nav-toggle i, 
body.scrolled .lang-btn i {
    font-size: 1.1rem; /* 稍微放大圖標 */
    margin: 0 !important;
    color: #5C5246 !important; /* 強制深色圖標，防止在淺色背景上看不見 */
    opacity: 1 !important;
}

body.scrolled .top-nav-toggle {
    top: 15px !important; /* 稍微上移 */
    left: 15px !important;
}

body.scrolled .language-switcher {
    top: 15px !important;
    right: 15px !important;
}

/* Hover effects - Default Light Theme */
.top-nav-toggle:hover, .lang-btn:hover {
    background-color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
    border-color: transparent;
}

.top-nav-toggle i, .lang-btn i {
    font-size: 1.1rem;
    opacity: 0.8;
}

.top-nav-toggle span, .lang-btn span {
    font-weight: 500;
    letter-spacing: 0.5px;
}

.nav-list a {
    word-break: break-word;
}

/* Dropdown Menu - Clean White Card Style */
.side-nav {
    position: fixed; /* Changed to fixed for viewport positioning */
    top: 70px; /* Below toggle */
    left: 25px;
    width: auto;
    min-width: 180px;
    max-width: calc(100vw - 50px);
    height: auto;
    background: rgba(255, 255, 255, 0.95); /* Clean white background */
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    z-index: 10000; /* Increased z-index to ensure it's on top of everything */
    padding: 10px;
    display: none;
    flex-direction: column;
    border: 1px solid rgba(255, 255, 255, 0.8);
    animation: slideDown 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Nav List */
.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 100%;
}

.nav-list li {
    border-bottom: 1px solid #f5f5f5;
}

.nav-list li:last-child {
    border-bottom: none;
}

.nav-list li a {
    display: block;
    padding: 12px 15px;
    color: #666;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
    text-shadow: none;
    text-align: left;
    border-radius: 8px;
}

.nav-list li a:hover,
.nav-list li a:active {
    background-color: #F7F9F8;
    color: var(--primary-color);
    padding-left: 20px;
}

/* Hide overlays */
.nav-overlay {
    display: none !important;
}

.top-nav-toggle.active {
    background-color: #fff;
    border-color: var(--primary-color);
}