/* ── Theme variables ──────────────────────────────────────────────────────── */
:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #1a1a2e;
  --muted: #666677;
  --border: #d0d3da;
  --hairline: #f0f0f0;
  --accent: #c0392b;
  --accent-hover: #a93226;
  --control: #e8eaed;
  --badge-bg: #d5f5e3;
  --badge-text: #1a7a42;
  --divider: #ccc;
  --active-bg: #fff9e6;
  --overlay: rgba(255,255,255,0.88);
}
body.dark {
  --bg: #15171e;
  --panel: #1e2129;
  --text: #e6e7ee;
  --muted: #9fa1b3;
  --border: #3a3e4a;
  --hairline: #2c303a;
  --accent: #e05545;
  --accent-hover: #c0392b;
  --control: #2a2e38;
  --badge-bg: #1d3a2a;
  --badge-text: #7fd8a0;
  --divider: #4a4e5a;
  --active-bg: #363019;
  --overlay: rgba(21,23,30,0.88);
}

/* ── Reset & base ─────────────────────────────────────────────────────────── */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', sans-serif; font-size: 13px;
  background: var(--bg); color: var(--text); overflow: hidden;
}

/* ── Layout ───────────────────────────────────────────────────────────────── */
#left-sidebar {
  position: absolute; top: 0; left: 0; width: 220px; bottom: 140px;
  background: var(--panel); padding: 14px 16px; overflow-y: auto;
  border-right: 1px solid var(--border); z-index: 999;
  transition: width 0.25s ease, padding 0.25s ease;
}
#left-toggle {
  position: absolute; top: 50%; left: 220px; transform: translateY(-50%);
  width: 16px; height: 52px; background: var(--accent); color: #fff;
  border: none; border-radius: 0 4px 4px 0; cursor: pointer; font-size: 11px;
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; transition: left 0.25s ease;
}
#left-toggle:hover { background: var(--accent-hover); }
body.left-hidden #left-sidebar  { width: 0; padding: 0; overflow: hidden; }
body.left-hidden #left-toggle   { left: 0; }

#map {
  position: absolute; top: 0; left: 220px; right: 340px; bottom: 140px;
  transition: left 0.25s ease, right 0.25s ease;
}
body.left-hidden   #map { left: 0; }
body.sidebar-hidden #map { right: 0; }

#sidebar {
  position: absolute; top: 0; right: 0; width: 340px; bottom: 140px;
  background: var(--panel); padding: 0 16px 14px; overflow-y: auto;
  border-left: 1px solid var(--border);
  transition: width 0.25s ease, padding 0.25s ease;
}
body.sidebar-hidden #sidebar { width: 0; padding: 0; overflow: hidden; }

#sidebar-toggle {
  position: absolute; top: 50%; right: 340px; transform: translateY(-50%);
  width: 16px; height: 52px; background: var(--accent); color: #fff;
  border: none; border-radius: 4px 0 0 4px; cursor: pointer; font-size: 11px;
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; transition: right 0.25s ease;
}
#sidebar-toggle:hover { background: var(--accent-hover); }
body.sidebar-hidden #sidebar-toggle { right: 0; }

#controls {
  position: absolute; bottom: 0; left: 0; right: 0; height: 140px;
  background: var(--panel); border-top: 1px solid var(--border);
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 8px; padding: 8px 20px;
}

/* ── Left sidebar: parameter controls ────────────────────────────────────── */
.title-block { margin-bottom: 18px; }
.title-block h1 {
  font-size: 19px; font-weight: 700; color: var(--accent); letter-spacing: -.01em;
}

.param-group { margin-bottom: 14px; }
.param-label { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); margin-bottom: 6px; cursor: help; }
.param-options { display: flex; flex-direction: column; gap: 5px; }
.param-options label { display: flex; align-items: baseline; gap: 7px; cursor: pointer; font-size: 13px; color: var(--text); }
.param-options input[type=radio] { accent-color: var(--accent); cursor: pointer; }
.param-note { font-size: 10px; color: var(--muted); }

/* The legacy pace sweep, folded away: it answers a modelling question rather than a
   racing one, so it should be findable without competing with the speed tiers. */
#paceLegacy > summary { list-style: none; cursor: pointer; }
#paceLegacy > summary::-webkit-details-marker { display: none; }
#paceLegacy > summary::before { content: '▸ '; }
#paceLegacy[open] > summary::before { content: '▾ '; }
#paceLegacy > .param-options { margin-top: 6px; }

#presetInfo { margin-top: 16px; font-size: 11px; color: var(--muted); line-height: 2.0; }
#presetInfo .info-row { display: flex; justify-content: space-between; border-bottom: 1px solid var(--hairline); padding: 2px 0; }
#presetInfo .info-row b { color: var(--text); }
#presetInfo .info-note { display: block; margin-top: 10px; line-height: 1.5; font-size: 10px; }
/* What this plan committed to, and what that cost. Set apart from the totals above it
   because it describes the question asked, not the answer. */
#presetInfo .info-rule {
  margin-top: 10px; padding: 7px 9px; border-radius: 4px;
  background: var(--active-bg); line-height: 1.5;
}
#presetInfo .info-rule b { color: var(--text); font-size: 12px; }
#presetInfo .info-rule .info-note { margin-top: 4px; }
#presetInfo .info-sub {
  margin-top: 12px; margin-bottom: 2px; font-size: 10px; text-transform: uppercase;
  letter-spacing: .06em; color: var(--accent);
}
#presetInfo .info-row .info-note { display: inline; margin-top: 0; }
/* The cut rows carry a tooltip and drive the itinerary highlight, so they read as live. */
#presetInfo .cut-row { cursor: help; }
#presetInfo .cut-row:hover { background: var(--active-bg); }
#presetError { margin-top: 8px; font-size: 11px; color: var(--accent); display: none; }
/* Shown when a scoring cap binds: the route is valid but the optimality claim is not. */
.caveat {
  margin-top: 10px; padding: 7px 9px; border-radius: 4px;
  border-left: 3px solid var(--accent); background: var(--active-bg);
  font-size: 10px; line-height: 1.5; color: var(--text);
}
.caveat b { color: var(--accent); }

/* ── Right sidebar: race stats ────────────────────────────────────────────── */
/* The stats count up as you step, so they stay pinned while the itinerary below
   scrolls itself to the active leg. The sidebar carries no top padding of its own —
   this block supplies it — so the pinned box sits flush against the scrollport and
   rows passing underneath cannot peek out above it. */
.stats-sticky {
  position: sticky; top: 0; z-index: 5; background: var(--panel);
  margin: 0 -16px; padding: 14px 16px 8px;
  border-bottom: 1px solid var(--hairline);
}
.day-header  { font-size: 17px; font-weight: 700; color: var(--accent); margin-bottom: 3px; }
.day-route   { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.sec-title   { font-size: 10px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); margin: 12px 0 6px; }
.stat-grid   { display: grid; grid-template-columns: 1fr 1fr; gap: 3px 10px; margin-bottom: 4px; }
.stat-lbl    { color: var(--muted); font-size: 11px; }
.stat-val    { color: var(--text); font-size: 13px; font-weight: 600; }
.stat-score  { margin-top: 7px; padding-top: 7px; border-top: 1px solid var(--hairline); }
.stat-score .stat-val { font-size: 15px; color: var(--accent); }

.prog-bg     { background: var(--control); border-radius: 4px; height: 13px; margin-bottom: 3px; }
.prog-fill   { height: 13px; border-radius: 4px; background: linear-gradient(90deg, #27ae60, #1a7a42); transition: width .35s; }
.prog-lbl    { font-size: 11px; color: var(--muted); display: flex; justify-content: space-between; }

.legend      { line-height: 2.0; font-size: 12px; }
.leg-line    { display: inline-block; width: 18px; height: 3px; border-radius: 1px; vertical-align: middle; margin-right: 5px; }

#itinerary   { font-size: 11px; line-height: 1.7; }
/* scroll-margin keeps scrollIntoView from parking the active leg underneath the pinned
   stats block, which is roughly this tall. */
.itin-step   { padding: 3px 4px 3px 6px; border-radius: 3px; cursor: pointer; border-left: 3px solid transparent; scroll-margin-top: 250px; }
.itin-step:hover  { background: var(--bg); }
.itin-step.active { background: var(--active-bg); border-left: 3px solid #FFD700; }
/* Hovering a cut in the left sidebar marks the steps it would remove. Accent-coloured
   rather than gold: this is the ground you are considering giving up, not where you are. */
.itin-step.in-cut { border-left: 3px solid var(--accent); opacity: .55; }
.itin-step .itin-n    { font-weight: 700; }
/* The turn arrow is the one glyph in this list a racer reads at speed, so it gets a size
   of its own rather than inheriting the 11px the rest of the row is set in. */
.itin-step .itin-turn { color: var(--accent); font-size: 14px; line-height: 1; cursor: help; }
.itin-step .itin-tag  { color: var(--accent); font-size: 10px; }
.itin-step .itin-meta { color: var(--muted); padding-left: 12px; display: block; }
.itin-step .itin-done { color: var(--badge-text); background: var(--badge-bg); border-radius: 8px; font-size: 9px; padding: 0 6px; white-space: nowrap; }

/* ── Bottom controls ──────────────────────────────────────────────────────── */
.slider-row  { display: flex; align-items: center; gap: 7px; width: 100%; max-width: 960px; }
.btn {
  background: var(--control); border: 1px solid var(--accent); color: var(--text);
  padding: 4px 11px; border-radius: 4px; cursor: pointer; font-size: 12px; white-space: nowrap;
}
.btn:hover   { background: var(--accent); color: #fff; }
.btn:disabled { opacity: .45; cursor: default; }
.btn:disabled:hover { background: var(--control); color: var(--text); }
/* The one button in the left pane; the rest live in the bottom control bar. */
.btn-csv     { width: 100%; margin-top: 14px; }
.day-lbl     { color: var(--accent); font-weight: 700; font-size: 13px; min-width: 90px; text-align: center; }
.toggle-row  { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.toggle-row label { display: flex; align-items: center; gap: 4px; cursor: pointer; font-size: 11px; color: var(--muted); }
.toggle-row input[type=checkbox] { accent-color: var(--accent); cursor: pointer; }
.opacity-row { display: flex; align-items: center; gap: 8px; font-size: 11px; color: var(--muted); flex-wrap: wrap; justify-content: center; }
#mapwarpOpacity, #hillshadeOpacity, #basemapOpacity {
  width: 110px; accent-color: var(--accent); cursor: pointer;
}
#basemapSel  { background: var(--panel); color: var(--text); }

/* ── Map tweaks ───────────────────────────────────────────────────────────── */
.grayscale-layer { filter: grayscale(100%); }
.start-marker    { filter: drop-shadow(0 0 3px #fff) drop-shadow(0 0 5px #fff); }

/* ── Dark-mode styling for Leaflet chrome ─────────────────────────────────── */
body.dark .leaflet-container { background: #15171e; }
body.dark .leaflet-popup-content-wrapper,
body.dark .leaflet-popup-tip { background: #1e2129; color: #e6e7ee; }
body.dark .leaflet-control-attribution { background: rgba(30,33,41,0.75); color: #9fa1b3; }
body.dark .leaflet-control-attribution a { color: #8ab4f8; }
body.dark .leaflet-bar a { background: #1e2129; color: #e6e7ee; border-bottom-color: #3a3e4a; }

/* ── Loading overlay ──────────────────────────────────────────────────────── */
#loading {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--overlay); z-index: 9999;
  align-items: center; justify-content: center; flex-direction: column; gap: 12px;
}
#loading.visible { display: flex; }
.spinner {
  width: 36px; height: 36px; border: 4px solid var(--control);
  border-top: 4px solid var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
#loading p { font-size: 13px; color: var(--muted); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Narrow screens ───────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  #left-sidebar, #sidebar { width: 190px; }
  #left-toggle { left: 190px; }
  #sidebar-toggle { right: 190px; }
  #map { left: 190px; right: 190px; }
}