:root {
    --ink: oklch(20% 0 0);
    --ink-muted: oklch(48% 0 0);
    --paper: oklch(97% 0 0);
    --paper-raised: oklch(99% 0 0);
    --paper-muted: oklch(92% 0 0);
    --line: oklch(76% 0 0);
    --line-strong: oklch(56% 0 0);
    --rail: oklch(55% 0.105 250);
    --rail-dark: oklch(44% 0.095 250);
    --error: oklch(35% 0 0);
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --panel-width: 332px;
    --results-width: 352px;
    --z-map: 0;
    --z-panel: 20;
    --z-dropdown: 40;
    --z-overlay: 100;
    color-scheme: light;
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    color: var(--ink);
    background: var(--paper-muted);
    font-family: "Avenir Next", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
    font-size: 1rem;
    line-height: 1.45;
    font-kerning: normal;
}

button,
input {
    font: inherit;
}

button,
label,
input[type="range"] {
    -webkit-tap-highlight-color: transparent;
}

[hidden] {
    display: none !important;
}

.workspace,
.map-container,
#map {
    position: absolute;
    inset: 0;
}

.workspace {
    isolation: isolate;
    overflow: hidden;
}

.map-container {
    z-index: var(--z-map);
    background: var(--paper-muted);
}

#map {
    width: 100%;
    height: 100%;
}

.search-panel,
.results-panel {
    position: absolute;
    z-index: var(--z-panel);
    top: var(--space-xl);
    max-height: calc(100dvh - 48px);
    overflow: visible;
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    background: var(--paper);
    box-shadow: 0 12px 30px oklch(20% 0 0 / 14%);
}

.search-panel {
    left: var(--space-xl);
    width: min(var(--panel-width), calc(100vw - 48px));
    padding: var(--space-xl);
}

.search-panel::before,
.results-panel::before {
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 5px;
    width: 1px;
    background: var(--line);
    content: "";
}

.tool-heading {
    display: grid;
    gap: var(--space-sm);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--line);
}

.tool-index,
.results-index,
.tool-meta,
.range-scale {
    color: var(--ink-muted);
    font-family: "DIN Alternate", "Arial Narrow", sans-serif;
    font-size: 0.6875rem;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    letter-spacing: 0.12em;
}

.tool-heading h1 {
    max-width: none;
    font-family: "STSong", "Songti SC", serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.015em;
    line-height: 1.12;
}

.tool-heading p {
    max-width: 22em;
    color: var(--ink-muted);
    font-size: 0.8125rem;
}

.search-form {
    display: grid;
    gap: var(--space-xl);
    padding-block: var(--space-xl);
}

.search-mode {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 3px;
    border: 1px solid var(--line);
    background: var(--paper-muted);
}

.search-mode legend {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.search-mode label {
    position: relative;
    cursor: pointer;
}

.search-mode input {
    position: absolute;
    opacity: 0;
}

.search-mode span {
    display: grid;
    min-height: 36px;
    place-items: center;
    color: var(--ink-muted);
    font-size: 0.8125rem;
    font-weight: 600;
}

.search-mode input:checked + span {
    color: var(--ink);
    background: var(--paper-raised);
    box-shadow: 0 1px 3px oklch(25% 0 0 / 10%);
}

.search-mode input:focus-visible + span,
button:focus-visible,
input[type="text"]:focus-visible,
input[type="range"]:focus-visible {
    outline: 2px solid var(--rail);
    outline-offset: 2px;
}

.search-group {
    display: grid;
    gap: var(--space-sm);
}

.search-group > label,
.range-heading label {
    color: var(--ink-muted);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
}

.search-input-container {
    position: relative;
}

#station-input,
#city-input {
    width: 100%;
    height: 44px;
    padding: 0 var(--space-md);
    border: 0;
    border-bottom: 1px solid var(--line-strong);
    border-radius: 0;
    color: var(--ink);
    background: var(--paper-raised);
    font-size: 0.9375rem;
}

#station-input::placeholder,
#city-input::placeholder {
    color: var(--ink-muted);
}

.search-results {
    position: absolute;
    z-index: var(--z-dropdown);
    top: calc(100% + 4px);
    right: 0;
    left: 0;
    display: none;
    max-height: 216px;
    overflow-y: auto;
    border: 1px solid var(--line-strong);
    background: var(--paper-raised);
    box-shadow: 0 10px 20px oklch(20% 0 0 / 12%);
}

.search-results.active {
    display: block;
}

.search-result-item {
    display: block;
    width: 100%;
    min-height: 40px;
    padding: var(--space-sm) var(--space-md);
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.search-result-item:last-child {
    border-bottom: 0;
}

.range-heading,
.range-scale,
.tool-meta,
.sorting-controls,
.station-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.range-heading output {
    color: var(--rail-dark);
    font-family: "DIN Alternate", "Arial Narrow", sans-serif;
    font-size: 1.125rem;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

input[type="range"] {
    width: 100%;
    height: 20px;
    margin-block: var(--space-sm) 0;
    appearance: none;
    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 2px;
    background: linear-gradient(to right, var(--rail) 0 var(--range-progress), var(--line) var(--range-progress) 100%);
}

input[type="range"]::-webkit-slider-thumb {
    width: 14px;
    height: 14px;
    margin-top: -6px;
    appearance: none;
    border: 2px solid var(--paper-raised);
    border-radius: 50%;
    background: var(--rail);
    box-shadow: 0 0 0 1px var(--rail-dark);
}

input[type="range"]::-moz-range-track {
    height: 2px;
    background: var(--line);
}

input[type="range"]::-moz-range-progress {
    height: 2px;
    background: var(--rail);
}

input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border: 2px solid var(--paper-raised);
    border-radius: 50%;
    background: var(--rail);
}

.range-scale {
    margin-top: -2px;
    letter-spacing: 0.04em;
}

#search-btn {
    display: flex;
    min-height: 46px;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    border: 1px solid var(--ink);
    border-radius: 0;
    color: var(--paper-raised);
    background: var(--ink);
    font-size: 0.875rem;
    font-weight: 650;
    cursor: pointer;
    transition: background-color 160ms ease, color 160ms ease;
}

#search-btn span {
    font-size: 1.1rem;
}

.tool-meta {
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--line);
    letter-spacing: 0.06em;
}

.results-panel {
    right: var(--space-xl);
    width: min(var(--results-width), calc(100vw - 48px));
    overflow-y: auto;
    padding: var(--space-xl);
    scrollbar-color: var(--line-strong) transparent;
    scrollbar-width: thin;
}

.results-heading {
    display: grid;
    gap: var(--space-sm);
    position: sticky;
    z-index: 2;
    top: calc(-1 * var(--space-xl));
    padding-block: var(--space-xl) var(--space-lg);
    border-bottom: 1px solid var(--line-strong);
    background: var(--paper);
}

.results-title-row {
    display: flex;
    min-height: 24px;
    align-items: center;
    justify-content: space-between;
}

.results-close {
    display: grid;
    width: 32px;
    height: 32px;
    place-items: center;
    border: 0;
    border-radius: 0;
    color: var(--ink-muted);
    background: transparent;
    font-family: "DIN Alternate", "Arial Narrow", sans-serif;
    font-size: 1.25rem;
    cursor: pointer;
}

#result-summary {
    font-family: "STSong", "Songti SC", serif;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.sorting-controls {
    position: sticky;
    z-index: 1;
    top: 76px;
    gap: var(--space-md);
    padding-block: var(--space-md);
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink-muted);
    font-size: 0.75rem;
}

.sorting-controls > div {
    display: flex;
    gap: var(--space-md);
}

.sorting-controls button {
    min-height: 32px;
    padding: 0;
    border: 0;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    color: var(--ink-muted);
    background: transparent;
    font-size: 0.75rem;
    cursor: pointer;
}

.sorting-controls button.active-sort {
    border-bottom-color: var(--rail);
    color: var(--rail-dark);
}

.station-group {
    border-bottom: 1px solid var(--line);
}

.station-header {
    width: 100%;
    min-height: 76px;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border: 0;
    border-radius: 0;
    color: var(--ink);
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.station-header > span:first-child {
    display: grid;
    width: 100%;
    grid-template-columns: 1fr auto;
    gap: 2px var(--space-md);
    align-items: baseline;
}

.station-header strong {
    grid-column: 1;
    font-size: 0.9375rem;
    font-weight: 650;
}

.station-header small {
    color: var(--ink-muted);
    font-size: 0.6875rem;
}

.station-header small:nth-of-type(1) {
    grid-column: 1;
}

.station-header small:nth-of-type(2) {
    grid-column: 2;
    grid-row: 1 / span 2;
    color: var(--ink);
    font-family: "DIN Alternate", "Arial Narrow", sans-serif;
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.toggle-icon {
    width: 8px;
    height: 8px;
    flex: 0 0 auto;
    border-right: 1px solid var(--ink-muted);
    border-bottom: 1px solid var(--ink-muted);
    transform: rotate(45deg);
    transition: transform 160ms ease;
}

.station-header:not(.collapsed) .toggle-icon {
    transform: rotate(225deg);
}

.station-details {
    padding-bottom: var(--space-lg);
    overflow-x: auto;
}

.station-details table {
    width: 100%;
    border-collapse: collapse;
    font-family: "DIN Alternate", "Arial Narrow", sans-serif;
    font-size: 0.6875rem;
    font-variant-numeric: tabular-nums;
}

.station-details th,
.station-details td {
    padding: var(--space-sm) var(--space-xs);
    border-bottom: 1px solid var(--line);
    text-align: left;
    white-space: nowrap;
}

.station-details th {
    color: var(--ink-muted);
    font-weight: 600;
}

.map-legend {
    position: absolute;
    z-index: 10;
    right: 50%;
    bottom: var(--space-xl);
    display: flex;
    gap: var(--space-lg);
    padding: 7px var(--space-md);
    transform: translateX(50%);
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink-muted);
    font-size: 0.6875rem;
    letter-spacing: 0.04em;
}

.map-legend span {
    display: flex;
    gap: 6px;
    align-items: center;
}

.map-legend i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ink-muted);
}

.map-legend .legend-origin {
    background: var(--rail);
}

.map-legend .legend-near {
    background: oklch(67% 0.012 250);
}

.map-legend .legend-far {
    background: oklch(37% 0.012 250);
}

.loading-overlay {
    position: fixed;
    z-index: var(--z-overlay);
    inset: 0;
    display: grid;
    place-items: center;
    background: oklch(20% 0 0 / 22%);
}

.loading-card {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    min-width: 260px;
    padding: var(--space-lg);
    border: 1px solid var(--line-strong);
    background: var(--paper);
    box-shadow: 0 12px 30px oklch(20% 0 0 / 14%);
    font-size: 0.8125rem;
}

.loading-spinner {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    border: 2px solid var(--line);
    border-top-color: var(--rail);
    border-radius: 50%;
    animation: spin 800ms linear infinite;
}

.error-message {
    position: fixed;
    z-index: calc(var(--z-overlay) + 1);
    top: var(--space-xl);
    left: 50%;
    max-width: min(560px, calc(100vw - 48px));
    padding: var(--space-md) var(--space-lg);
    transform: translateX(-50%);
    border: 1px solid var(--error);
    background: var(--paper-raised);
    color: var(--error);
    font-size: 0.8125rem;
}

.mapboxgl-ctrl-group {
    overflow: hidden;
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    background: var(--paper) !important;
    box-shadow: none !important;
}

.mapboxgl-popup-content {
    padding: var(--space-md) var(--space-lg);
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    background: var(--paper-raised);
    box-shadow: 0 8px 20px oklch(20% 0 0 / 14%);
    font-size: 0.75rem;
}

.mapboxgl-popup-content h3 {
    margin-bottom: var(--space-xs);
    font-family: "STSong", "Songti SC", serif;
    font-size: 1rem;
}

@media (hover: hover) {
    #search-btn:hover {
        color: var(--ink);
        background: var(--paper-raised);
    }

    .search-result-item:hover,
    .station-header:hover {
        background: var(--paper-muted);
    }
}

@media (pointer: coarse) {
    .search-mode span,
    .search-result-item,
    .sorting-controls button,
    .results-close {
        min-width: 44px;
        min-height: 44px;
    }

    .mapboxgl-ctrl-group button {
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 960px) {
    .search-mode span,
    .search-result-item,
    .sorting-controls button,
    .results-close {
        min-width: 44px;
        min-height: 44px;
    }

    .mapboxgl-ctrl-group button {
        width: 44px;
        height: 44px;
    }

    .search-panel,
    .results-panel {
        top: auto;
        right: var(--space-md);
        bottom: max(var(--space-md), env(safe-area-inset-bottom));
        left: var(--space-md);
        width: auto;
        max-height: min(58dvh, 520px);
    }

    .search-panel {
        padding: var(--space-lg);
        overflow-y: auto;
    }

    .tool-heading {
        grid-template-columns: 1fr auto;
        gap: var(--space-xs) var(--space-md);
        padding-bottom: var(--space-md);
    }

    .tool-index,
    .tool-heading p {
        display: none;
    }

    .tool-heading h1 {
        max-width: none;
        font-size: 1.375rem;
    }

    .search-form {
        grid-template-columns: 112px 1fr;
        gap: var(--space-md);
        padding-block: var(--space-lg);
    }

    .search-mode {
        grid-column: 1;
    }

    .search-group {
        grid-column: 2;
    }

    .time-range,
    #search-btn {
        grid-column: 1 / -1;
    }

    .tool-meta {
        display: none;
    }

    .results-panel {
        z-index: calc(var(--z-panel) + 1);
        padding: var(--space-lg);
    }

    .results-heading {
        top: calc(-1 * var(--space-lg));
        padding-block: var(--space-lg) var(--space-md);
    }

    .sorting-controls {
        top: 64px;
    }

    .map-legend {
        top: max(var(--space-md), env(safe-area-inset-top));
        right: var(--space-md);
        bottom: auto;
        transform: none;
    }

    .mapboxgl-ctrl-bottom-left {
        bottom: calc(min(58dvh, 520px) + var(--space-xl));
    }
}

@media (max-width: 420px) {
    .search-form {
        grid-template-columns: 1fr;
    }

    .search-mode,
    .search-group,
    .time-range,
    #search-btn {
        grid-column: 1;
    }

    .map-legend span:nth-child(2) {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}