:root {
    --bg: #fdfdfd;
    --bg-alt: #f7f8f9;
    --border: #e1e4e8;
    --border-light: #f1f3f5;
    --text: #24292e;
    --text-muted: #6a737d;
    --accent: #0366d6;
    --accent-light: rgba(3, 102, 214, 0.05);
    --success: #28a745;
    --danger: #d73a49;
    --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

header h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 32px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.stat-card {
    padding: 16px 20px;
    border-right: 1px solid var(--border);
}

.stat-card:last-child {
    border-right: none;
}

.stat-card.primary {
    background: var(--accent-light);
}

.stat-card dt {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.stat-card dd {
    font-size: 24px;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 32px;
    align-items: start;
}

.section {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.section-header {
    padding: 12px 16px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 8px 8px 0 0;
}

.section-header h2,
.section-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.section-content {
    padding: 16px;
}

/* Leaderboard */
.leaderboard-container {
    max-height: 500px;
    overflow-y: auto;
}

.leaderboard-item {
    display: grid;
    grid-template-columns: 40px 1fr auto 100px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
    align-items: center;
    transition: background 0.1s;
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.leaderboard-item:hover {
    background: var(--bg-alt);
}

.rank {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 12px;
}

.username {
    font-weight: 500;
    color: var(--text);
}

.timestamp {
    font-size: 11px;
    color: var(--text-muted);
    padding-right: 12px;
}

.score {
    font-family: var(--font-mono);
    text-align: right;
    font-weight: 700;
    color: var(--accent);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-item {
    padding: 12px;
    background: var(--bg-alt);
    border-radius: 6px;
    border: 1px solid var(--border-light);
}

.stat-item dt {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 2px;
}

.stat-item dd {
    font-size: 15px;
    font-weight: 700;
    font-family: var(--font-mono);
}

button {
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    border: 1px solid var(--border);
    background: #fff;
    transition: all 0.2s;
    color: var(--text);
}

button:hover {
    background: var(--bg-alt);
    border-color: var(--text-muted);
}

button:active {
    transform: translateY(1px);
}

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

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

.btn-accent:hover {
    background: #0256b9;
    border-color: #0256b9;
}

.btn-danger {
    color: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover {
    background: rgba(215, 58, 73, 0.05);
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--text-muted);
}

.btn-ghost:hover {
    color: var(--text);
    background: var(--bg-alt);
}

input[type="text"],
input[type="number"],
input[type="password"],
select {
    font-family: inherit;
    font-size: 13px;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.1);
}

.search-input {
    width: 100%;
    max-width: 240px;
}

.date-filter {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light);
}

.date-filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.date-filter-labels {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.btn-small {
    font-size: 11px;
    padding: 2px 10px;
}

.dual-range {
    position: relative;
    height: 32px;
    margin: 8px 0;
}

.dual-range input[type="range"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 32px;
    pointer-events: none;
    -webkit-appearance: none;
    appearance: none;
    background: none;
    margin: 0;
    padding: 0;
}

.dual-range input[type="range"]::-webkit-slider-runnable-track {
    height: 4px;
    background: transparent;
}

.dual-range input[type="range"]::-moz-range-track {
    height: 4px;
    background: transparent;
}

.dual-range input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    pointer-events: all;
    cursor: grab;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    margin-top: -7px;
    position: relative;
    z-index: 2;
}

.dual-range input[type="range"]::-moz-range-thumb {
    pointer-events: all;
    cursor: grab;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.dual-range input[type="range"]:active::-webkit-slider-thumb {
    cursor: grabbing;
    transform: scale(1.1);
}

.range-track {
    position: absolute;
    top: 14px;
    height: 4px;
    background: var(--border-light);
    border-radius: 2px;
    width: 100%;
    pointer-events: none;
}

.range-track::after {
    content: '';
    position: absolute;
    top: 0;
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    left: var(--range-left, 0%);
    width: var(--range-width, 100%);
}

.history-paging {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.history-paging span {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
}

.chart-box {
    height: 180px;
    position: relative;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.history-list {
    font-size: 13px;
}

.history-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
}

.history-row:last-child {
    border-bottom: none;
}

.history-row .time {
    color: var(--text-muted);
    font-size: 11px;
    font-family: var(--font-mono);
}

#statusMessage {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 10px 20px;
    background: var(--text);
    color: white;
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

#statusMessage.show {
    opacity: 1;
    transform: translateY(0);
}

.stress-status {
    font-size: 12px;
    text-align: center;
    color: var(--text-muted);
    margin-top: 8px;
}

.perf-table {
    font-size: 13px;
}

.perf-header,
.perf-row {
    display: grid;
    grid-template-columns: 1fr 80px 60px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
}

.perf-header {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.perf-row span:not(.endpoint) {
    font-family: var(--font-mono);
    text-align: right;
}

.perf-row .endpoint {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (max-width: 1100px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .stats-overview {
        grid-template-columns: 1fr 1fr;
    }
}