:root {
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --primary-color: #007aff; /* Apple Blue */
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --bg-gradient-start: #fbfbfd;
    --bg-gradient-end: #e8e8ed;
    --card-bg: #ffffff;
    --header-bg: #f8f9fa;
    --border-color: #dee2e6;
    --input-bg: #ffffff;
}

/* General Body Styling */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    /* Apple-style subtle mesh/gradient background */
    background: radial-gradient(circle at 0% 0%, #eef2f3 0%, #d9e4f5 100%);
    background-attachment: fixed;
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
}

/* --- Common Glass Mixin --- */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
}

/* --- Header & Top Navigation --- */
.top-header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    position: sticky;
    top: 0;
    z-index: 1001;
}

/* Hamburger Menu */
.menu-toggle {
    display: block; /* Always show toggle */
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    padding: 10px;
    margin-right: 10px;
    color: var(--primary-color);
}

.top-header .logo-group {
    display: flex;
    align-items: center;
}

.top-header .logo {
    font-size: 1.3em;
    font-weight: 600;
    color: #000;
    letter-spacing: -0.5px;
}

.top-header .user-info {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.top-header .user-info a {
    color: var(--primary-color);
    text-decoration: none;
    margin-left: 15px;
    font-weight: 500;
}

.main-nav {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 0 30px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    position: sticky;
    top: 60px;
    z-index: 1000;
}

.nav-tabs {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    white-space: nowrap;
    justify-content: center; /* Center the tabs */
}

.nav-tabs li a {
    display: block;
    padding: 14px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    font-size: 0.95em;
    font-weight: 500;
}

.nav-tabs li a:hover {
    color: var(--primary-color);
    background: rgba(0, 122, 255, 0.05);
    border-radius: 8px 8px 0 0;
}

.nav-tabs li a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}


/* --- Main Layout --- */
.main-container {
    display: flex;
    width: 100%;
    min-height: calc(100vh - 110px);
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 20px;
}

.sidebar {
    width: 260px;
    margin-left: 20px;
    /* Apply Glass Style */
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
    
    padding: 20px;
    height: fit-content;
    flex-shrink: 0;
    
    /* Transition for collapse */
    transition: all 0.3s ease;
    overflow: hidden;
    opacity: 1;
}

/* Collapsed State (Desktop Only) */
@media (min-width: 769px) {
    body.sidebar-collapsed .sidebar {
        width: 0;
        padding: 0;
        margin-left: 0;
        border: none;
        opacity: 0;
    }
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li a {
    display: block;
    padding: 10px 16px;
    text-decoration: none;
    color: var(--text-color);
    border-radius: 10px;
    margin-bottom: 8px;
    font-size: 0.95em;
    transition: background 0.2s ease;
}

.sidebar-menu li a:hover {
    background: rgba(0, 0, 0, 0.03);
}

.sidebar-menu li a.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.content {
    flex-grow: 1;
    padding: 0 30px 40px 30px;
    overflow-x: hidden;
    box-sizing: border-box;
    /* Center Content Wrapper */
    max-width: 1000px;
    margin: 0 auto;
}

.content h1 {
    margin-top: 0;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 25px;
    text-align: center; /* Center Title */
}

/* --- Network Tools Specific --- */
.network-tool-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: var(--glass-shadow);
}

.network-input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center; /* Center Inputs */
}

.network-input-group input {
    max-width: 400px;
}

.network-results {
    background: #1e1e1e; /* Dark terminal-like background */
    color: #00ff00;       /* Green text */
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    min-height: 100px;
    max-height: 500px;
    overflow-y: auto;
    white-space: pre-wrap;
    border: 1px solid #333;
    margin-top: 15px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.5);
}

.network-results-header {
    background: #333;
    color: #fff;
    padding: 5px 10px;
    border-radius: 8px 8px 0 0;
    font-size: 0.85em;
    font-weight: bold;
    margin-bottom: -5px; /* Merge with results block */
    display: inline-block;
}

/* --- Dashboard Cards (Glass) --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.card {
    /* Glass Effect */
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    
    padding: 30px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    text-decoration: none;
    color: inherit;
    display: block;
}

.card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.9);
}

.card h2 {
    margin-top: 0;
    font-size: 1.4em;
    color: var(--text-color);
    margin-bottom: 10px;
}

.card p {
    font-size: 1em;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* --- UI Elements (Inputs, Buttons) --- */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
    border-radius: 12px;
    transition: all 0.2s ease;
    cursor: pointer;
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.25);
}

.btn:hover {
    background-color: #0063cc;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.35);
}

.btn:disabled {
    background-color: #d1d1d6;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

input[type="text"],
input[type="number"],
input[type="url"],
select,
textarea {
    display: block;
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    transition: all 0.2s ease;
    box-sizing: border-box;
    backdrop-filter: blur(5px);
}

input:focus,
select:focus,
textarea:focus {
    background: #fff;
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
}

/* --- Release Notes / Custom Sections --- */
.release-section {
    /* Override inline styles from template with glass class */
    background: var(--glass-bg) !important;
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border) !important;
    border-radius: 20px !important;
    box-shadow: var(--glass-shadow) !important;
}

.release-item {
    padding: 15px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 20px;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .main-nav { top: 60px; padding: 0; }
    .main-container { padding-top: 10px; display: block; }
    
    .sidebar {
        margin: 0;
        position: fixed;
        top: 0; left: 0;
        height: 100%;
        width: 80%;
        max-width: 300px;
        z-index: 2000;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        border-radius: 0 20px 20px 0;
    }
    .sidebar.active { transform: translateX(0); }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 100%;
        background: rgba(0,0,0,0.3);
        backdrop-filter: blur(4px);
        z-index: 1500;
    }
    .sidebar-overlay.active { display: block; }
    
    .content { 
        padding: 20px; 
        max-width: 100%;
    }

    .network-input-group {
        flex-direction: column;
    }
    
    .network-input-group input, 
    .network-input-group button {
        width: 100%;
        max-width: none;
    }
    
    /* Dashboard Grid Stacking */
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Sidebar Toggle Button */
.sidebar-toggle-btn {
    position: absolute;
    top: 20px;
    left: 20px; /* Fixed at sidebar start */
    z-index: 1002;
    background: rgba(0, 122, 255, 0.4); /* Light Blue Transparent */
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%; /* Circle form */
    width: 28px; /* Slightly smaller for circle */
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: background 0.2s ease, transform 0.2s ease;
}

.sidebar-toggle-btn:hover {
    background: rgba(0, 122, 255, 0.7);
    transform: scale(1.1);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .sidebar-toggle-btn {
        position: fixed;
        top: 75px;
        left: 10px;
        background: rgba(0, 122, 255, 0.8); /* More visible on mobile */
    }
}

/* --- Dark Mode Variables --- */
[data-theme="dark"] {
    --glass-bg: rgba(30, 30, 30, 0.75);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --primary-color: #409cff; /* Lighter blue */
    --text-color: #f0f0f0;
    --text-secondary: #a0a0a0;
    --bg-gradient-start: #1a1a1a;
    --bg-gradient-end: #000000;
    --card-bg: #1e1e1e;
    --header-bg: #2d2d2d;
    --border-color: #444444;
    --input-bg: #2b2b2b;
}

[data-theme="dark"] body {
    background: radial-gradient(circle at 50% 0%, #2b323a 0%, #000000 100%);
}

[data-theme="dark"] .top-header,
[data-theme="dark"] .main-nav {
    background: rgba(30, 30, 30, 0.8);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .card,
[data-theme="dark"] .glass-panel,
[data-theme="dark"] .sidebar,
[data-theme="dark"] .network-tool-container {
    background: var(--glass-bg);
    border-color: var(--glass-border);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-color);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
    background: rgba(0, 0, 0, 0.5);
    border-color: var(--primary-color);
}

[data-theme="dark"] .network-results {
    background: #000;
    border: 1px solid #333;
}

[data-theme="dark"] .nav-tabs li a:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Theme Toggle Button */
.theme-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px;
    border-radius: 50%;
    transition: background 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    width: 32px;
    height: 32px;
}

.theme-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .theme-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* --- Global Table Styles (Dark Mode Compatible) --- */
.results-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.5); /* Glass-like */
    border-radius: 8px;
    overflow: hidden;
}

.results-table th, 
.results-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    color: var(--text-color);
}

.results-table th {
    background-color: rgba(0, 0, 0, 0.05);
    font-weight: 600;
}

.results-table tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

/* Dark Mode Overrides for Table */
[data-theme="dark"] .results-table {
    background: rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .results-table th {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

[data-theme="dark"] .results-table td {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

[data-theme="dark"] .results-table tr:hover {
    background-color: rgba(255, 255, 255, 0.05);
}