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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-orange: #d29922;
    --accent-red: #f85149;
    --accent-purple: #a371f7;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

.app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 24px;
    color: var(--accent-blue);
}

.header-meta {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Main layout */
main {
    display: grid;
    gap: 20px;
}

/* Panels */
section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
}

section h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.panel-header h2 {
    margin-bottom: 0;
}

/* Config Panel */
.config-panel {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #1a2332 100%);
}

.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group.flex-grow {
    flex: 1;
}

.form-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="url"],
input[type="number"] {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: 'SF Mono', 'Consolas', monospace;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="url"] {
    width: 100%;
}

input[type="number"] {
    width: 120px;
}

input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.form-actions {
    display: flex;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon {
    font-size: 12px;
}

.btn-primary {
    background: var(--accent-green);
    color: #fff;
    border-color: var(--accent-green);
}

.btn-primary:hover:not(:disabled) {
    background: #2ea043;
}

.btn-danger {
    background: transparent;
    color: var(--accent-red);
    border-color: var(--border-color);
}

.btn-danger:hover:not(:disabled) {
    background: var(--accent-red);
    color: #fff;
    border-color: var(--accent-red);
}

.btn-small {
    padding: 4px 12px;
    font-size: 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-small:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Status Panel */
.status-panel {
    background: var(--bg-secondary);
}

.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.status-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px 16px;
}

.status-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.status-value {
    font-size: 18px;
    font-weight: 600;
    font-family: 'SF Mono', 'Consolas', monospace;
    color: var(--text-primary);
}

.status-idle { color: var(--text-secondary); }
.status-connecting { color: var(--accent-orange); }
.status-waiting { color: var(--accent-blue); }
.status-complete { color: var(--accent-green); }
.status-error { color: var(--accent-red); }
.status-stopped { color: var(--text-muted); }

.result-card {
    border-color: var(--accent-green);
    background: rgba(63, 185, 80, 0.1);
}

.result-value {
    color: var(--accent-green) !important;
    font-size: 24px;
}

/* Packets Panel */
.packets-panel {
    max-height: 400px;
    display: flex;
    flex-direction: column;
}

.packet-count {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.table-wrapper {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

thead {
    position: sticky;
    top: 0;
    background: var(--bg-tertiary);
    z-index: 1;
}

th {
    text-align: left;
    padding: 10px 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

tr:last-child td {
    border-bottom: none;
}

.col-time {
    width: 100px;
    font-family: 'SF Mono', 'Consolas', monospace;
    color: var(--text-muted);
    white-space: nowrap;
}

.col-type {
    width: 80px;
}

.col-size {
    width: 80px;
    font-family: 'SF Mono', 'Consolas', monospace;
    color: var(--text-secondary);
    text-align: right;
}

.col-data {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 12px;
    word-break: break-all;
}

.col-data code {
    color: var(--text-secondary);
}

.packet-send {
    background: rgba(88, 166, 255, 0.05);
}

.packet-recv {
    background: rgba(63, 185, 80, 0.05);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-send {
    background: rgba(88, 166, 255, 0.15);
    color: var(--accent-blue);
}

.badge-recv {
    background: rgba(63, 185, 80, 0.15);
    color: var(--accent-green);
}

.empty-state {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

/* Log Panel */
.log-panel {
    background: var(--bg-secondary);
}

#eventLog {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    min-height: 120px;
    max-height: 200px;
    overflow-y: auto;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }

    input[type="number"] {
        width: 100%;
    }

    .status-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .col-data {
        max-width: 200px;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}