:root {
    --ui-bg: #fffaef;
    --ui-surface: #fffaef;
    --ui-surface-2: #fff0c2;
    --ui-text: #111111;
    --ui-muted: #5f5a4f;
    --ui-border: #111111;
    --ui-yellow: #ffd440;
    --ui-pink: #fe7da8;
    --ui-blue: #27ccf3;
    --ui-green: #a9d877;
    --ui-orange: #f8a16f;
    --ui-red: #ff4d4f;
    --ui-shadow: #111111;
    --ui-border-width: 3px;
    --ui-border-width-thin: 2px;
    --ui-shadow-sm: 2px 2px 0 var(--ui-shadow);
    --ui-shadow-md: 4px 4px 0 var(--ui-shadow);
    --ui-shadow-lg: 6px 6px 0 var(--ui-shadow);
    --transition: 120ms ease;
}

* {
    box-sizing: border-box;
}

html {
    background: var(--ui-bg);
}

body {
    min-height: 100vh;
    margin: 0;
    padding: 24px;
    background:
        linear-gradient(90deg, rgba(17, 17, 17, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(17, 17, 17, 0.05) 1px, transparent 1px),
        var(--ui-bg);
    background-size: 20px 20px;
    color: var(--ui-text);
    font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    line-height: 1.55;
}

a {
    color: inherit;
}

.card {
    width: min(1040px, 100%);
    margin: 0 auto;
    padding: 20px;
    background: var(--ui-surface);
    border: var(--ui-border-width) solid var(--ui-border);
    box-shadow: var(--ui-shadow-lg);
}

.card--narrow {
    width: min(860px, 100%);
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
    padding: 14px 16px;
    background: var(--ui-yellow);
    border: var(--ui-border-width) solid var(--ui-border);
    box-shadow: var(--ui-shadow-md);
}

.header h1,
h1 {
    margin: 0;
    font-size: clamp(1.35rem, 2vw, 1.9rem);
    font-weight: 900;
}

.header-links {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    flex-wrap: wrap;
}

.back-link {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 12px;
    background: var(--ui-surface);
    border: var(--ui-border-width-thin) solid var(--ui-border);
    box-shadow: var(--ui-shadow-sm);
    color: var(--ui-text);
    font-size: 0.88rem;
    font-weight: 850;
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.back-link:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 var(--ui-shadow);
    background: var(--ui-blue);
}

.status-banner,
#stats,
.control-container,
#chart-container,
.metric,
.speed-options,
.cases,
.tips,
.info-card,
.map-container {
    background: var(--ui-surface);
    border: var(--ui-border-width) solid var(--ui-border);
    box-shadow: var(--ui-shadow-md);
}

.status-banner {
    margin-bottom: 20px;
    padding: 14px 16px;
    font-size: 0.95rem;
    font-weight: 800;
}

.status-banner--compact {
    margin-bottom: 0;
    padding: 12px 14px;
    text-align: center;
    background: var(--ui-surface-2);
}

.speed-options {
    display: grid;
    gap: 16px;
    margin-bottom: 20px;
    padding: 14px 16px;
    background: var(--ui-surface-2);
}

.node-picker-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.node-picker button {
    min-height: 36px;
    padding: 0 10px;
    font-size: 0.8rem;
    box-shadow: var(--ui-shadow-sm);
}

.node-status {
    margin: 0;
    color: var(--ui-muted);
    font-size: 0.8rem;
    overflow-wrap: anywhere;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
}

.form-group.is-disabled {
    opacity: 0.58;
}

label {
    color: var(--ui-text);
    font-size: 0.9rem;
    font-weight: 900;
}

.range-container {
    display: grid;
    grid-template-columns: minmax(120px, 1fr) 86px;
    align-items: center;
    gap: 12px;
}

input,
select,
button {
    font: inherit;
}

.range-input,
select {
    width: 100%;
    min-height: 42px;
    padding: 8px 10px;
    background: var(--ui-surface);
    border: var(--ui-border-width) solid var(--ui-border);
    box-shadow: var(--ui-shadow-sm);
    color: var(--ui-text);
    font-size: 0.92rem;
    font-weight: 850;
    outline: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.range-input {
    text-align: center;
}

.range-input:focus,
select:focus {
    transform: translate(1px, 1px);
    background: var(--ui-surface-2);
    box-shadow: 1px 1px 0 var(--ui-shadow);
}

.range-input::-webkit-inner-spin-button,
.range-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.range-input[type="number"] {
    appearance: textfield;
}

input[type="range"] {
    width: 100%;
    height: 20px;
    margin: 0;
    border: var(--ui-border-width-thin) solid var(--ui-border);
    background: var(--ui-surface-2);
    box-shadow: var(--ui-shadow-sm);
    cursor: pointer;
    outline: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    width: 20px;
    height: 28px;
    border: var(--ui-border-width-thin) solid var(--ui-border);
    background: var(--ui-pink);
    box-shadow: var(--ui-shadow-sm);
    appearance: none;
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 28px;
    border: var(--ui-border-width-thin) solid var(--ui-border);
    background: var(--ui-pink);
    box-shadow: var(--ui-shadow-sm);
}

.checkbox-group {
    display: grid;
    grid-template-columns: 22px 1fr;
    align-items: start;
    gap: 10px;
    color: var(--ui-muted);
    font-size: 0.9rem;
    font-weight: 750;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin: 2px 0 0;
    border: var(--ui-border-width-thin) solid var(--ui-border);
    accent-color: var(--ui-green);
}

.interactive-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.9fr) minmax(300px, 1.1fr);
    gap: 20px;
}

#stats {
    padding: 18px;
    background: var(--ui-surface-2);
}

#stats div {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 7ch 2.4ch;
    align-items: baseline;
    column-gap: 12px;
    margin-bottom: 8px;
    font-size: 0.92rem;
    font-weight: 800;
}

.stats-label {
    min-width: 0;
}

.stats-value,
.stats-unit {
    font-variant-numeric: tabular-nums;
    font-weight: 950;
    text-align: right;
}

.stats-value {
    grid-column: 2;
}

.stats-row--plain .stats-value {
    grid-column: 2 / 4;
}

.stats-unit {
    grid-column: 3;
}

#stats div:last-child {
    margin-bottom: 0;
}

#stats .stats-divider {
    display: block;
    margin: 14px 0;
    border-top: var(--ui-border-width-thin) solid var(--ui-border);
}

.control-container {
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.button-group {
    display: flex;
    gap: 12px;
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 0 14px;
    border: var(--ui-border-width) solid var(--ui-border);
    background: var(--ui-surface);
    color: var(--ui-text);
    box-shadow: 3px 3px 0 var(--ui-shadow);
    font-size: 0.95rem;
    font-weight: 900;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

button[hidden] {
    display: none;
}

button:hover:not(:disabled) {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0 var(--ui-shadow);
}

button:active:not(:disabled) {
    transform: translate(3px, 3px);
    box-shadow: 0 0 0 var(--ui-shadow);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.58;
}

#start-btn {
    flex: 1;
    background: var(--ui-pink);
}

#stop-btn {
    flex: 1;
    background: var(--ui-red);
}

#chart-container {
    margin-top: 20px;
    padding: 18px;
}

#chart-container canvas {
    display: block;
    width: 100%;
    height: auto;
}

.stats-help {
    margin-top: 12px;
    color: var(--ui-muted);
    font-size: 0.86rem;
}

.stats-help summary {
    width: fit-content;
    cursor: pointer;
    font-weight: 750;
}

.stats-help p:last-child {
    margin-bottom: 0;
}

.footer {
    margin-top: 24px;
    padding-top: 14px;
    border-top: var(--ui-border-width-thin) solid var(--ui-border);
    color: var(--ui-muted);
    font-size: 0.82rem;
    font-weight: 750;
    text-align: center;
}

.footer a {
    font-weight: 900;
    text-decoration: underline;
    text-decoration-thickness: 2px;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.metric {
    padding: 18px;
    text-align: center;
}

.metric:nth-child(1) {
    background: var(--ui-blue);
}

.metric:nth-child(2) {
    background: var(--ui-green);
}

.metric:nth-child(3) {
    background: var(--ui-orange);
}

.metric-label {
    font-size: 0.82rem;
    font-weight: 900;
}

.metric-value {
    margin: 8px 0;
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 950;
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}

.cases {
    padding: 18px;
    margin-bottom: 20px;
    overflow: auto;
}

.cases h2 {
    margin: 0 0 14px;
    font-size: 1.08rem;
    font-weight: 950;
}

.case-table {
    width: 100%;
    border-collapse: collapse;
}

.case-table th,
.case-table td {
    padding: 10px 12px;
    border: var(--ui-border-width-thin) solid var(--ui-border);
    font-size: 0.92rem;
    text-align: left;
}

.case-table th {
    background: var(--ui-yellow);
    font-weight: 950;
}

.case-table td {
    font-weight: 800;
}

.case-request-time {
    display: block;
    margin-top: 4px;
    color: var(--ui-muted);
    font-size: 0.75rem;
    font-weight: 600;
}

.tips summary {
    cursor: pointer;
}

.tips details[open] summary {
    margin-bottom: 8px;
}

.progress-trigger {
    position: relative;
    width: 100%;
    min-height: 96px;
    padding: 18px;
    overflow: hidden;
    background: var(--ui-pink);
    flex-direction: column;
}

#cancel-test {
    width: 100%;
    margin-top: 12px;
}

.progress-trigger .progress-visual {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.progress-trigger .progress-fill {
    position: absolute;
    inset: 0;
    width: 0%;
    background: var(--ui-blue);
    border-right: var(--ui-border-width) solid var(--ui-border);
    transition: width 180ms ease;
}

.progress-trigger .progress-label,
.progress-trigger .progress-hint {
    position: relative;
    z-index: 1;
    text-align: center;
}

.progress-trigger .progress-label {
    font-size: 1rem;
    font-weight: 950;
}

.progress-trigger .progress-hint {
    font-size: 0.82rem;
    font-weight: 850;
}

.progress-trigger.is-error {
    background: var(--ui-red);
}

.progress-trigger.is-error .progress-fill {
    background: var(--ui-orange);
}

.tips {
    margin-top: 20px;
    padding: 16px;
    color: var(--ui-muted);
    font-size: 0.86rem;
    font-weight: 750;
}

.tips p {
    margin: 0 0 8px;
}

.tips p:last-child {
    margin-bottom: 0;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.info-card {
    padding: 18px;
}

.info-card:nth-child(1) {
    background: var(--ui-blue);
}

.info-card:nth-child(2) {
    background: var(--ui-pink);
}

.info-card h2 {
    margin: 0 0 14px;
    font-size: 1.06rem;
    font-weight: 950;
}

.info-card dl {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 8px 12px;
    margin: 0;
}

.info-card dt {
    font-size: 0.86rem;
    font-weight: 950;
}

.info-card dd {
    min-width: 0;
    margin: 0;
    font-size: 0.9rem;
    font-weight: 850;
    overflow-wrap: anywhere;
}

.map-container {
    padding: 16px;
}

#ip-map {
    width: 100%;
    height: 340px;
    border: var(--ui-border-width) solid var(--ui-border);
}

.map-hint {
    margin: 12px 0 0;
    color: var(--ui-muted);
    font-size: 0.84rem;
    font-weight: 750;
}

.map-error {
    margin: 0;
    padding: 16px;
    color: var(--ui-red);
    font-weight: 850;
}

.leaflet-container {
    font-family: inherit;
}

.leaflet-control-zoom a,
.leaflet-popup-content-wrapper,
.leaflet-popup-tip {
    border-radius: 0;
    border-color: var(--ui-border);
}

@media (max-width: 900px) {
    .form-grid,
    .metrics,
    .info-grid,
    .interactive-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    body {
        padding: 12px;
    }

    .card {
        padding: 14px;
        box-shadow: var(--ui-shadow-md);
    }

    .header {
        align-items: stretch;
        flex-direction: column;
    }

    .header-links {
        justify-content: flex-start;
    }

    .range-container {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .case-table {
        min-width: 560px;
    }

    #ip-map {
        height: 280px;
    }
}