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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-link: #58a6ff;
    --border-color: #30363d;
    --accent-green: #3fb950;
    --accent-cyan: #39d2c0;
    --accent-red: #f85149;
    --accent-yellow: #d2991d;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}

#status-bar {
    display: flex;
    gap: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#ws-status {
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-on {
    color: var(--accent-green);
}

.status-off {
    color: var(--accent-red);
}

#spot-count {
    color: var(--text-secondary);
}

#table-container {
    flex: 1;
    overflow-y: auto;
    padding: 8px 8px 0 8px;
}

#spots-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    table-layout: fixed;
}

#spots-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

#spots-table th {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 8px 10px;
    text-align: left;
    font-weight: 500;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

#header-row th {
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--border-color);
}

#header-row th:hover {
    color: var(--text-primary);
}

#header-row th.sorted-asc,
#header-row th.sorted-desc {
    color: var(--accent-cyan);
}

.sort-arrow {
    font-size: 0.7rem;
    margin-left: 4px;
}

#filter-row th {
    padding: 4px 6px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.col-filter {
    width: 100%;
    padding: 4px 6px;
    background: var(--bg-tertiary);
    border: 1px solid #484f58;
    border-radius: 3px;
    color: #e6edf3;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    outline: none;
    transition: border-color 0.15s;
}

.col-filter:focus {
    border-color: var(--accent-cyan);
    background: var(--bg-primary);
}

.col-filter::placeholder {
    color: #6e7681;
    opacity: 1;
}

.freq-filter {
    width: calc(50% - 8px);
    display: inline-block;
}

.freq-sep {
    color: var(--text-secondary);
    padding: 0 4px;
    font-size: 0.75rem;
}

#spots-body td {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

#spots-body tr:nth-child(even) td {
    background: var(--bg-secondary);
}

#spots-body tr:hover td {
    background: var(--bg-tertiary);
}

#spots-body tr.new-spot td {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        background-color: rgba(57, 210, 192, 0.15);
    }
    to {
        background-color: transparent;
    }
}

.col-time {
    width: 13%;
}

.col-freq {
    width: 11%;
}

.col-dx {
    width: 11%;
}

.col-spotter {
    width: 11%;
}

.col-info {
    width: 42%;
}

.col-filter-match {
    width: 12%;
}

#spots-body .freq-cell {
    color: var(--accent-cyan);
}

#spots-body .dx-call {
    color: var(--accent-yellow);
    font-weight: 500;
}

#spots-body .spotter-call {
    color: var(--accent-green);
}

#spots-body .info-cell {
    color: var(--text-secondary);
    font-style: italic;
}

#spots-body .filter-match-cell {
    color: var(--accent-cyan);
    font-size: 0.8rem;
}

@media (max-width: 768px) {
    header {
        padding: 8px 12px;
        flex-direction: column;
        gap: 6px;
    }

    #table-container {
        padding: 4px;
    }

    #spots-table {
        font-size: 0.75rem;
    }

    #spots-table th,
    #spots-body td {
        padding: 4px 6px;
    }
}