@import url("https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Inter:wght@300;400;500;600&display=swap");

:root {
    --bg:        #0a0a0f;
    --surface:   #12121a;
    --surface2:  #1a1a26;
    --border:    #2a2a3d;
    --border2:   #3a3a55;
    --text:      #e8e8f0;
    --text2:     #9090b0;
    --text3:     #5a5a78;
    --accent:    #4f8ef7;
    --neon:      #00e5ff;
    --neon2:     #7c3aed;
    --green:     #00ff88;
    --orange:    #ff6b35;
    --mono:      "Space Mono", monospace;
    --sans:      "Inter", sans-serif;
    --panel-w:   320px;
    --header-h:  48px;
    --radius:    10px;
    --radius-sm: 6px;
}

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

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

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* ── header ─────────────────────────────────────────────── */
.header {
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 0 18px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    z-index: 100;
}
.header-logo {
    height: 28px;
    width: auto;
    display: block;
    opacity: 0.9;
}
.header-title {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 700;
    color: var(--neon);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.header-sep { width: 1px; height: 18px; background: var(--border2); flex-shrink: 0; }
.header-back {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text3);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color .15s;
}
.header-back:hover { color: var(--text2); }

.header-status {
    margin-left: auto;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text3);
    letter-spacing: 0.02em;
}
.header-status.loading { color: var(--neon); }
.header-status.error   { color: var(--orange); }
.header-status.running { color: var(--green); }

/* ── main layout ─────────────────────────────────────────── */
.main { display: flex; flex: 1; min-height: 0; }

/* ── left panel ──────────────────────────────────────────── */
.panel {
    width: var(--panel-w);
    min-width: var(--panel-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-section {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
}
.panel-section:last-child { border-bottom: none; }

.section-label {
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 10px;
}

/* city tabs */
.city-tabs {
    display: flex;
    gap: 4px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px;
}
.city-tab {
    flex: 1;
    padding: 5px 0;
    border: none;
    background: transparent;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text3);
    cursor: pointer;
    border-radius: 4px;
    transition: background .18s, color .18s;
    letter-spacing: 0.02em;
}
.city-tab.active {
    background: var(--border2);
    color: var(--text);
}
.city-tab:disabled { opacity: 0.4; cursor: not-allowed; }

/* inputs */.field-row { display: flex; flex-direction: column; gap: 3px; }
.field-row + .field-row { margin-top: 8px; }
.field-label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    letter-spacing: 0.04em;
}
.field-row input,
.field-row select {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 7px 10px;
    font-family: var(--mono);
    font-size: 11.5px;
    color: var(--text);
    outline: none;
    width: 100%;
    transition: border-color .15s;
    -webkit-appearance: none;
    appearance: none;
}
.field-row input:focus,
.field-row select:focus { border-color: var(--border2); }
.field-row input[type="date"]::-webkit-calendar-picker-indicator,
.field-row input[type="time"]::-webkit-calendar-picker-indicator {
    filter: invert(0.6);
    cursor: pointer;
}
.field-row select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235a5a78'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
    cursor: pointer;
}

.row2 { display: flex; gap: 8px; }
.row2 .field-row { flex: 1; }


/* run button */
.run-btn {
    width: 100%;
    padding: 10px;
    background: var(--neon2);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background .15s, box-shadow .15s;
    margin-top: 4px;
}
.run-btn:hover { background: #6d28d9; box-shadow: 0 0 18px rgba(124,58,237,.4); }
.run-btn:disabled { background: var(--border); color: var(--text3); cursor: not-allowed; box-shadow: none; }

/* playback controls */
.playback {
    display: flex;
    align-items: center;
    gap: 8px;
}
.pb-btn {
    width: 30px; height: 30px;
    border: 1px solid var(--border2);
    background: var(--surface2);
    color: var(--text2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px;
    transition: background .15s, color .15s;
    flex-shrink: 0;
}
.pb-btn:hover { background: var(--border2); color: var(--text); }
.pb-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.pb-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 3px;
    background: var(--border2);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}
.pb-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 13px; height: 13px;
    border-radius: 50%;
    background: var(--neon);
    box-shadow: 0 0 6px var(--neon);
    cursor: pointer;
}
.pb-round-label {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--neon);
    min-width: 48px;
    text-align: right;
    white-space: nowrap;
}

/* speed select */
.speed-row {
    display: flex;
    align-items: center;
    gap: 8px;
}
.speed-row label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    white-space: nowrap;
}
.speed-row select {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 4px 22px 4px 8px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text2);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235a5a78'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
}

/* stats panel */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}
.stat-box {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
}
.stat-val {
    font-family: var(--mono);
    font-size: 16px;
    font-weight: 700;
    color: var(--neon);
    line-height: 1;
}
.stat-lbl {
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text3);
    margin-top: 3px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* round legend */
.round-legend {
    display: flex;
    flex-direction: column;
    gap: 5px;
    overflow-y: auto;
    max-height: 160px;
}
.round-legend::-webkit-scrollbar { width: 3px; }
.round-legend::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.legend-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    border-radius: var(--radius-sm);
    background: var(--surface2);
    cursor: pointer;
    transition: background .15s;
    border: 1px solid transparent;
}
.legend-row:hover { background: var(--border); }
.legend-row.active { border-color: var(--border2); }
.legend-dot {
    width: 10px; height: 10px; border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 5px currentColor;
}
.legend-text {
    font-family: var(--mono);
    font-size: 10.5px;
    color: var(--text2);
    flex: 1;
}
.legend-count {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
}

/* ── O/D field ───────────────────────────────────────────── */
.od-field {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface2);
    cursor: pointer;
    transition: border-color .15s;
}
.od-field:hover        { border-color: var(--border2); }
.od-field.active-field { border-color: var(--neon); box-shadow: 0 0 0 1px var(--neon); }

.od-connector {
    width: 1px;
    height: 10px;
    background: var(--border2);
    margin: 3px 0 3px 18px;
}

.od-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.od-dot--origin {
    background: var(--neon);
    box-shadow: 0 0 7px var(--neon);
}
.od-dot--dest {
    background: var(--orange);
    box-shadow: 0 0 7px var(--orange);
}

.od-content { flex: 1; min-width: 0; }
.od-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 2px;
}
.od-content input {
    width: 100%;
    border: none;
    background: transparent;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text);
    outline: none;
}
.od-content input::placeholder { color: var(--text3); }

.click-hint {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    text-align: center;
    padding: 6px 0 2px;
    letter-spacing: 0.04em;
    transition: color .15s;
}
.click-hint[data-mode="origin"]      { color: var(--neon); }
.click-hint[data-mode="destination"] { color: var(--orange); }

/* ── map ─────────────────────────────────────────────────── */
.map-wrap { flex: 1; position: relative; }
#map { width: 100%; height: 100%; }

/* loading overlay */
.loading-overlay {
    position: absolute; inset: 0;
    background: rgba(10,10,15,.88);
    backdrop-filter: blur(6px);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    z-index: 999; gap: 14px;
}
.loading-overlay.hidden { display: none; }
.spinner {
    width: 30px; height: 30px;
    border: 2px solid var(--border2);
    border-top-color: var(--neon);
    border-radius: 50%;
    animation: spin .7s linear infinite;
    box-shadow: 0 0 12px var(--neon);
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text2);
    letter-spacing: 0.04em;
}

/* map cursor */
.leaflet-container { cursor: crosshair !important; font-family: var(--sans) !important; }
.leaflet-container.leaflet-dragging { cursor: grabbing !important; }

/* leaflet dark overrides */
.leaflet-control-zoom a {
    background: var(--surface) !important;
    color: var(--text2) !important;
    border-color: var(--border2) !important;
}
.leaflet-control-zoom a:hover { background: var(--surface2) !important; color: var(--text) !important; }
.leaflet-control-attribution {
    background: rgba(10,10,15,.75) !important;
    color: var(--text3) !important;
    font-size: 10px !important;
}
.leaflet-control-attribution a { color: var(--text3) !important; }

/* stop tooltip */
.stop-tooltip {
    background: var(--surface) !important;
    color: var(--text) !important;
    border: 1px solid var(--border2) !important;
    border-radius: 6px !important;
    box-shadow: 0 4px 16px rgba(0,0,0,.5) !important;
    font-family: var(--mono) !important;
    font-size: 11px !important;
    padding: 4px 8px !important;
}
.stop-tooltip::before { display: none !important; }

/* map pin markers */
.pin-origin {
    width: 14px; height: 14px; border-radius: 50%;
    background: var(--neon);
    border: 2.5px solid #0a0a0f;
    box-shadow: 0 0 12px var(--neon), 0 0 24px rgba(0,229,255,.4);
}
.pin-dest {
    width: 14px; height: 14px; border-radius: 50%;
    background: var(--orange);
    border: 2.5px solid #0a0a0f;
    box-shadow: 0 0 12px var(--orange), 0 0 24px rgba(255,107,53,.4);
}

/* algorithm annotation box */
.algo-box {
    position: absolute;
    bottom: 16px; left: 16px;
    z-index: 800;
    background: rgba(10,10,15,.85);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    padding: 10px 14px;
    max-width: 260px;
    pointer-events: none;
}
.algo-box.hidden { display: none; }
.algo-round {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--neon);
    font-weight: 700;
    letter-spacing: 0.06em;
    margin-bottom: 3px;
}
.algo-desc {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text2);
    line-height: 1.55;
}

/* path pane fade-in + scale-grow on destination reached */
.leaflet-pathPane-pane {
    transform-origin: center center;
    opacity: 0;
    transform: scale(0.88);
    transition: opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
}
.leaflet-pathPane-pane.path-visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

/* destination pulse animation */
.dest-pulse {
    position: absolute;
    width: 48px; height: 48px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--pulse-color, #00e5ff);
    background: transparent;
    animation: dest-pulse-anim 1.2s ease-out forwards;
    pointer-events: none;
}
@keyframes dest-pulse-anim {
    0%   { transform: translate(-50%, -50%) scale(0.3); opacity: 1; }
    60%  { transform: translate(-50%, -50%) scale(1.4); opacity: 0.6; }
    100% { transform: translate(-50%, -50%) scale(2.2); opacity: 0; }
}