:root {
    --primary: #0EA5E9;
    --secondary: #38BDF8;
    --accent: #A78BFA;
    --background: #0B1018;
    --surface: #1E293B;
    --surface-hover: #334155;
    --border: #334155;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    
    --radius: 12px;
    --radius-sm: 6px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: rgba(11, 16, 24, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.header-controls {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: #0284C7;
    box-shadow: 0 0 15px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--text-muted);
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
}

/* Main Layout */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 240px;
    min-width: 240px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1.5rem;
    overflow-y: auto;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box svg {
    position: absolute;
    left: 0.75rem;
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
}

.filter-group label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    text-transform: none;
    letter-spacing: normal;
    font-weight: 400;
    cursor: pointer;
    margin-bottom: 0;
}

.test-panel {
    margin-top: auto;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    padding: 1rem;
    border: 1px solid var(--border);
}

.test-panel h3 {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.test-panel p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.test-panel button {
    width: 100%;
    margin-bottom: 0.5rem;
}

/* Request List */
.request-list-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 300px;
    background: var(--background);
}

.list-header {
    display: flex;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.col { padding: 0 0.5rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.col.name { flex: 3; }
.col.method { flex: 1; min-width: 60px; }
.col.status { flex: 1; min-width: 60px; }
.col.type { flex: 1; min-width: 80px; }
.col.time { flex: 1; min-width: 80px; text-align: right; }
.col.waterfall { flex: 2; min-width: 100px; }

.request-list {
    flex: 1;
    overflow-y: auto;
}

.request-item {
    display: flex;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: background 0.15s;
    align-items: center;
}

.request-item:hover {
    background: rgba(30, 41, 59, 0.5);
}

.request-item.selected {
    background: rgba(14, 165, 233, 0.15);
}

.status-2xx { color: var(--success); }
.status-3xx { color: var(--warning); }
.status-4xx, .status-5xx { color: var(--error); }
.status-0 { color: var(--text-muted); }

.method-GET { color: var(--primary); }
.method-POST { color: var(--success); }
.method-PUT, .method-PATCH { color: var(--warning); }
.method-DELETE { color: var(--error); }

.waterfall-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.waterfall-bar {
    position: absolute;
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    gap: 1rem;
}

/* Resizer */
.resizer {
    width: 4px;
    background: var(--border);
    cursor: col-resize;
    transition: background 0.2s;
}
.resizer:hover, .resizer.dragging {
    background: var(--primary);
}

/* Request Detail */
.request-detail {
    width: 40%;
    min-width: 300px;
    background: var(--surface);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border);
}

.detail-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
}

.detail-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.detail-content.hidden {
    display: none;
}

.detail-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: rgba(0,0,0,0.2);
    padding: 0 0.5rem;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.replay-btn {
    padding: 0.5rem;
    color: var(--accent);
    margin-top: 0.25rem;
    margin-bottom: 0.25rem;
    border-radius: var(--radius-sm);
}

.replay-btn:hover {
    background: rgba(167, 139, 250, 0.1);
}

.tab-panels {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.panel-section {
    margin-bottom: 1.5rem;
}

.panel-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.25rem;
}

.kv-list {
    font-size: 0.8125rem;
    word-break: break-all;
}

.kv-item {
    display: flex;
    padding: 0.25rem 0;
    border-bottom: 1px dashed rgba(255,255,255,0.05);
}

.kv-key {
    font-weight: 600;
    color: var(--secondary);
    width: 30%;
    min-width: 120px;
}

.kv-value {
    color: var(--text-primary);
    flex: 1;
}

.code-view {
    background: rgba(0,0,0,0.3);
    border-radius: var(--radius-sm);
    padding: 1rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.8125rem;
    overflow-x: auto;
    white-space: pre-wrap;
    border: 1px solid var(--border);
}

.cookie-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

.cookie-table th, .cookie-table td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.cookie-table th {
    color: var(--text-muted);
    font-weight: 600;
}

/* Timing Chart */
.timing-row {
    display: flex;
    margin-bottom: 0.5rem;
    font-size: 0.8125rem;
    align-items: center;
}

.timing-label {
    width: 100px;
    color: var(--text-secondary);
}

.timing-bar-wrapper {
    flex: 1;
    height: 12px;
    background: rgba(0,0,0,0.2);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    margin: 0 1rem;
}

.timing-bar {
    height: 100%;
    border-radius: 6px;
    position: absolute;
}

.timing-bar.dns { background: #8B5CF6; }
.timing-bar.tcp { background: #F59E0B; }
.timing-bar.req { background: #10B981; }
.timing-bar.res { background: #0EA5E9; }

.timing-val {
    width: 60px;
    text-align: right;
    color: var(--text-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}