:root {
    /* Soft dark purple tones inspired by Material Design Dark Theme */
    --bg-dark: #120f1a;
    --bg-card: #1f1a2e;
    --bg-card-hover: #2a233d;
    --border-color: #312944;
    --text-main: #b3a9c9;
    --text-bright: #e6e1f0;
    
    /* Material Design accents */
    --accent-primary: #bb86fc;   /* Soft purple */
    --accent-secondary: #03dac6; /* Teal */
    --accent-success: #4ade80;   /* Green */
    --accent-warning: #facc15;   /* Yellow */
    --accent-error: #ef4444;     /* Red */
    
    --font-sans: 'Roboto', 'Inter', sans-serif;
    --font-mono: 'Consolas', 'Courier New', monospace;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --radius: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 14px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Utilities */
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.mb-10 { margin-bottom: 10px; }
.mt-10 { margin-top: 10px; }
.w-full { width: 100%; }
.flex-1 { flex: 1; display: flex; flex-direction: column; }

.dl-color { color: var(--accent-primary) !important; }
.ul-color { color: var(--accent-secondary) !important; }
.ping-color { color: var(--accent-success) !important; }
.jitter-color { color: var(--accent-warning) !important; }
.ready, .good, .supported { color: var(--accent-success) !important; }
.poor, .not-supported { color: var(--accent-error) !important; }

/* Top Navigation */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-name {
    font-weight: 700;
    font-size: 18px;
    color: var(--text-bright);
    letter-spacing: 0.5px;
}

.version {
    color: var(--accent-primary);
    font-size: 12px;
    margin-left: 4px;
    font-weight: 500;
}

/* Language Selector */
.lang-select {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-bright);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23b3a9c9%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat, repeat;
    background-position: right 12px top 50%, 0 0;
    background-size: .65em auto, 100%;
    padding-right: 32px;
    transition: all 0.2s ease;
}

.lang-select:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

.lang-select option {
    background: var(--bg-card);
    color: var(--text-bright);
}

/* Tab Menu */
.tab-menu {
    display: flex;
    gap: 8px;
    padding: 12px 24px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 14px;
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 20px;
    transition: all 0.2s ease;
}

.tab-btn:hover { 
    background: var(--bg-card-hover);
    color: var(--text-bright); 
}

.tab-btn.active {
    background: rgba(187, 134, 252, 0.15);
    color: var(--accent-primary);
}

/* Main Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.tab-content { display: none; }
.tab-content.active { display: block; height: 100%; }

/* Cards & Containers */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: 16px;
}

.card-title {
    color: var(--text-bright);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Buttons & Inputs */
.btn-action, .btn-secondary {
    background: var(--accent-primary);
    border: none;
    color: #000;
    padding: 10px 20px;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-action:hover {
    background: #d0a8ff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.btn-action:disabled {
    background: var(--border-color);
    color: var(--text-main);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-bright);
    box-shadow: none;
}
.btn-secondary:hover { 
    background: var(--bg-card-hover); 
}

.custom-input {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-bright);
    font-family: var(--font-sans);
    padding: 12px;
    border-radius: 8px;
    margin-top: 12px;
    outline: none;
    transition: border-color 0.2s;
}
.custom-input:focus { border-color: var(--accent-primary); }

/* ---- Speed Test Grid ---- */
.grid-layout-speedtest {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    height: 100%;
}

.column-left { display: flex; flex-direction: column; gap: 24px; }
.column-right { display: flex; flex-direction: column; gap: 24px; }

/* Gauge Card */
.speed-monitor {
    text-align: center;
}
.gauge-container {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 10px auto 20px auto;
}
.gauge-value {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: 36px; font-weight: 700; color: var(--accent-primary);
}
.gauge-unit {
    position: absolute;
    top: 68%; left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-main);
    font-weight: 500;
}

/* Network Info Card */
.network-info table { width: 100%; border-collapse: collapse; font-size: 13px; margin-bottom: 24px;}
.network-info table td { padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.network-info table td:first-child { color: var(--text-main); }
.network-info table td:last-child { color: var(--text-bright); text-align: right; font-weight: 500;}

.cq-title { color: var(--text-main); font-size: 12px; font-weight: 600; letter-spacing: 1px; margin-bottom: 12px; text-transform: uppercase;}
.cq-row { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 8px; font-weight: 500;}
.code-block { background: var(--bg-dark); padding: 12px; border-radius: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--text-main); margin-top: 8px;}

/* Right column metrics */
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.metric-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-md);}
.m-title { font-size: 12px; font-weight: 600; color: var(--text-main); letter-spacing: 1px; margin-bottom: 8px;}
.m-val { font-size: 32px; font-weight: 700; margin-bottom: 4px; letter-spacing: -0.5px;}
.m-unit { font-size: 14px; color: var(--text-main); font-weight: 500;}
.m-sub { font-size: 12px; font-weight: 500; }

.chart-card { flex: 1; min-height: 250px; display: flex; flex-direction: column;}
.chart-container { flex: 1; position: relative; width: 100%; height: 100%; margin-top: 10px;}

.distributions-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dist-card { height: 200px; display: flex; flex-direction: column;}

/* ---- Ping & Traceroute Grid ---- */
.grid-layout-tools {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    height: 100%;
}

.sidebar { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; box-shadow: var(--shadow-md);}
.target-list { list-style: none; flex: 1; overflow-y: auto;}
.target-list li {
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    color: var(--text-main);
    transition: background 0.2s;
    margin-bottom: 4px;
}
.target-list li:hover { background: var(--bg-card-hover); }
.target-list li.active { background: rgba(187, 134, 252, 0.15); color: var(--accent-primary); }
.target-list li span:last-child { color: var(--text-bright); opacity: 0.6; font-size: 12px;}

.main-panel { display: flex; flex-direction: column; gap: 20px; }

.stats-bar { display: flex; justify-content: space-around; padding: 20px;}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 6px;}
.stat-label { font-size: 12px; font-weight: 600; color: var(--text-main); letter-spacing: 1px;}
.stat-val { font-size: 20px; font-weight: 700;}

.terminal-card { flex: 1; display: flex; flex-direction: column; overflow: hidden; background: var(--bg-dark) !important;}
.terminal-output {
    flex: 1;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-bright);
    line-height: 1.6;
    padding: 20px;
    white-space: pre-wrap;
}

.trace-table-container { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
.trace-table { width: 100%; border-collapse: collapse; font-size: 13px; text-align: left;}
.trace-table th { color: var(--text-main); font-weight: 600; padding: 14px 20px; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; background: var(--bg-dark);}
.trace-table td { padding: 12px 20px; border-bottom: 1px solid var(--border-color); color: var(--text-bright);}
.trace-raw { flex: 1; display: none; } 

.badge { border: 1px solid var(--accent-secondary); color: var(--accent-secondary); padding: 4px 10px; border-radius: 12px; font-size: 11px; font-weight: 600; letter-spacing: 0.5px;}

/* ---- Browser Info Grid ---- */
.browser-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    padding-bottom: 24px;
}
.browser-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-md);
}
.bc-title { color: var(--text-bright); font-weight: 600; font-size: 15px; margin-bottom: 16px; display: flex; align-items: center; gap: 8px;}
.bc-row { display: grid; grid-template-columns: 140px 1fr; padding: 10px 0; border-bottom: 1px solid var(--border-color); font-size: 13px;}
.bc-row span:first-child { color: var(--text-main); }
.bc-row span:last-child { color: var(--text-bright); font-weight: 500;}
.bc-tag { display: inline-block; padding: 3px 8px; border-radius: 12px; font-size: 11px; font-weight: 600; background: rgba(255,255,255,0.05);}
.bc-tag.yes { color: var(--accent-success); background: rgba(74, 222, 128, 0.1);}
.bc-tag.no { color: var(--accent-error); background: rgba(239, 68, 68, 0.1);}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4a4060; }