/* Layout: the isometric Earth fills the whole screen. Everything else floats over it:
   the title top-left, search and the Places list top-right, map controls bottom-left,
   and a popup card next to the city you open (a bottom sheet on phones). */
:root {
  /* Colour: sea-glass sky around the board, paper cards, slate ink, signal-red pins */
  --sky: #d3e2e8;
  --sky-dot: #bfd2da;
  --paper: #f7f8f5;
  --paper-2: #edf1ee;
  --ink: #16222a;
  --ink-2: #4b5a63;
  --line: #d1dadc;
  --accent: #d6402b;
  --accent-ink: #ffffff;
  --focus: #1d6fd8;
  --t-ai: #b4521d;
  --t-data: #0d7064;
  --t-3d: #2c5bc7;
  --t-classic: #86650f;
  --chip-bg: #ffffff;
  --shadow: 0 1px 0 rgb(22 34 42 / 0.05), 0 10px 28px rgb(22 34 42 / 0.14);

  /* Type: a pixel display face, a humanist body face, a mono for coordinates and dates */
  --font-display: "Jersey 10", ui-monospace, "Courier New", monospace;
  --font-body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --step--1: 0.8125rem;
  --step-0: 0.9375rem;
  --step-1: 1.125rem;
  --step-2: 1.5rem;
  --step-3: 2.4rem;

  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  --sheet: 0px; /* height of an open bottom sheet on phones, set by app.js */
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sky: #08111b;
    --sky-dot: #13212f;
    --paper: #0f1923;
    --paper-2: #16232f;
    --ink: #e6edf1;
    --ink-2: #9aaebb;
    --line: #243443;
    --accent: #ffbf47;
    --accent-ink: #1b1305;
    --focus: #7fb6ff;
    --t-ai: #f0915a;
    --t-data: #4fc7b6;
    --t-3d: #8fb0ff;
    --t-classic: #e1c35e;
    --chip-bg: #132029;
    --shadow: 0 1px 0 rgb(0 0 0 / 0.3), 0 12px 32px rgb(0 0 0 / 0.5);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --sky: #08111b;
  --sky-dot: #13212f;
  --paper: #0f1923;
  --paper-2: #16232f;
  --ink: #e6edf1;
  --ink-2: #9aaebb;
  --line: #243443;
  --accent: #ffbf47;
  --accent-ink: #1b1305;
  --focus: #7fb6ff;
  --t-ai: #f0915a;
  --t-data: #4fc7b6;
  --t-3d: #8fb0ff;
  --t-classic: #e1c35e;
  --chip-bg: #132029;
  --shadow: 0 1px 0 rgb(0 0 0 / 0.3), 0 12px 32px rgb(0 0 0 / 0.5);
  color-scheme: dark;
}

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

html,
body { height: 100%; }

body {
  margin: 0;
  background: var(--sky);
  color: var(--ink);
  font: var(--step-0) / 1.5 var(--font-body);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

a { color: inherit; text-decoration-color: color-mix(in srgb, currentColor 35%, transparent); text-underline-offset: 2px; }
a:hover { text-decoration-color: currentColor; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

button { font: inherit; color: inherit; }

/* ---------------------------------------------------------------- stage */
.stage {
  position: relative;
  height: 100%;
  overflow: hidden;
  background-color: var(--sky);
  background-image: radial-gradient(var(--sky-dot) 1px, transparent 1.2px);
  background-size: 18px 18px;
}

#world {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
}
#world.dragging { cursor: grabbing; }
#world.over-pin { cursor: pointer; }
#world:focus-visible { outline-offset: -4px; }

/* ---------------------------------------------------------------- brand */
.brand {
  position: absolute;
  top: 14px;
  left: var(--gutter-l);
  max-width: min(440px, calc(100% - 32px));
  pointer-events: none;
}
.brand h1 {
  margin: 0;
  font: 400 var(--step-3) / 0.9 var(--font-display);
  letter-spacing: 0.01em;
  color: var(--ink);
  text-shadow: 0 1px 0 var(--sky), 0 0 18px var(--sky);
}
.brand .tagline {
  margin: 6px 0 0;
  color: var(--ink-2);
  text-shadow: 0 0 10px var(--sky), 0 0 2px var(--sky);
}
.brand .stats {
  margin: 8px 0 0;
  font: 500 var(--step--1) / 1.3 var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 8px var(--sky), 0 0 2px var(--sky);
}

/* ---------------------------------------------------------------- top bar: search and places */
.topbar {
  position: absolute;
  z-index: 4;
  top: 16px;
  right: var(--gutter-r);
  display: flex;
  gap: 8px;
  align-items: flex-start;
}
.search { position: relative; width: 300px; }
.search > svg {
  position: absolute;
  left: 12px;
  top: 21px;
  width: 17px;
  height: 17px;
  transform: translateY(-50%);
  fill: none;
  stroke: var(--ink-2);
  stroke-width: 1.7;
  stroke-linecap: round;
  pointer-events: none;
}
.search input {
  width: 100%;
  height: 42px;
  padding: 0 12px 0 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  box-shadow: var(--shadow);
}
.search input::placeholder { color: var(--ink-2); opacity: 0.85; }

.results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  max-height: min(420px, 60vh);
  overflow-y: auto;
}
.results li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 10px;
  align-items: center;
  padding: 7px 9px;
  border-radius: 7px;
  cursor: pointer;
}
.results li[aria-selected="true"],
.results li:hover { background: var(--paper-2); }
.results .r-name { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results .r-sub { grid-column: 1; font-size: var(--step--1); color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results .r-kind { grid-row: 1 / span 2; grid-column: 2; font: 400 var(--step-1) / 1 var(--font-display); color: var(--ink-2); }
.results .r-empty { display: block; color: var(--ink-2); cursor: default; }
.results .r-empty:hover { background: none; }

.places-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow);
  cursor: pointer;
  white-space: nowrap;
}
.places-button:hover { background: var(--paper-2); }
.places-button[aria-expanded="true"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.places-button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.places-button svg circle { fill: currentColor; stroke: none; }
.places-button .count {
  font: 400 var(--step-1) / 1 var(--font-display);
  font-variant-numeric: tabular-nums;
}
.places-button .filter-note { font-size: var(--step--1); opacity: 0.8; }

/* ---------------------------------------------------------------- popups */
.pop {
  position: absolute;
  z-index: 3;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.close {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
}
.close:hover { background: var(--paper-2); color: var(--ink); }
.close svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

/* the list of places, under the Places button */
.places-pop {
  top: 66px;
  right: var(--gutter-r);
  width: 370px;
  max-height: calc(100% - 82px);
  display: flex;
  flex-direction: column;
  padding: 14px 16px 0;
}
.pop-head { display: flex; align-items: center; gap: 10px; }
.pop-head h2 { margin: 0; flex: 1; font: 400 var(--step-2) / 1 var(--font-display); }
.pop-head h2:focus { outline: none; }
.sort { display: inline-flex; align-items: center; gap: 6px; font-size: var(--step--1); color: var(--ink-2); }
.sort select {
  height: 28px;
  padding: 0 6px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--chip-bg);
  color: var(--ink);
  font: inherit;
}

.filters { display: flex; flex-wrap: wrap; gap: 6px; padding-block: 12px 10px; border-bottom: 1px solid var(--line); }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--ink);
  font-size: var(--step--1);
  cursor: pointer;
}
.chip:hover { border-color: var(--ink-2); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.chip .sw { width: 9px; height: 9px; border-radius: 2px; transform: rotate(45deg); }
.chip .n { font-family: var(--font-mono); font-size: 0.75rem; opacity: 0.75; font-variant-numeric: tabular-nums; }

.places {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  margin: 0 -16px;
  padding: 6px 8px 8px;
}
.place-row {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  column-gap: 10px;
  padding: 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.place-row:hover { background: var(--paper-2); }
.place-row .pr-text { min-width: 0; }
.place-row .pr-name { display: block; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.place-row .pr-country { display: block; font-size: var(--step--1); color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pr-dots { display: inline-flex; gap: 3px; max-width: 92px; flex-wrap: wrap; justify-content: flex-end; }
.pr-dots i { width: 8px; height: 8px; border-radius: 1.5px; transform: rotate(45deg) scale(0.85); }
.pr-count { min-width: 24px; font: 400 var(--step-1) / 1 var(--font-display); text-align: right; font-variant-numeric: tabular-nums; }
.empty { margin: 14px 0; color: var(--ink-2); }

.pop-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  margin: 0 -16px;
  padding: 10px 16px 12px;
  border-top: 1px solid var(--line);
  font-size: var(--step--1);
  color: var(--ink-2);
}
.pop-foot .updated { margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; }
.pop-foot a { color: var(--ink); }
.link-button {
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
  text-underline-offset: 2px;
  cursor: pointer;
}

/* the card next to an open city; app.js moves it beside the city */
.place-pop {
  left: 0;
  top: 0;
  width: 350px;
  max-height: min(560px, calc(100% - 32px));
  display: flex;
  flex-direction: column;
  transition: opacity 0.18s ease;
  will-change: transform;
}
.place-pop.traveling { opacity: 0; pointer-events: none; }
.place-pop > .close { position: absolute; top: 10px; right: 10px; z-index: 1; }
.grab { display: none; }
.place-body {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px 18px 4px;
  border-radius: inherit;
}
.notch {
  position: absolute;
  top: var(--notch-y, 50%);
  width: 14px;
  height: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  transform: translateY(-50%) rotate(45deg);
}
.place-pop.on-right .notch { left: -8px; border-top: 0; border-right: 0; }
.place-pop.on-left .notch { right: -8px; border-bottom: 0; border-left: 0; }
.place-pop.docked .notch { display: none; }

.place-head { padding-right: 34px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.place-head h2 { margin: 0; font: 400 2.1rem / 0.95 var(--font-display); text-wrap: balance; }
.place-head h2:focus { outline: none; }
.place-head .where { margin: 6px 0 0; color: var(--ink-2); font-size: var(--step--1); }
.place-head .where .geo { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.place-head .landmark { margin: 4px 0 0; color: var(--ink-2); font-size: var(--step--1); font-style: italic; }

.maps { list-style: none; margin: 0; padding: 0 0 8px; }
.map { padding-block: 12px; border-bottom: 1px solid var(--line); }
.map:last-child { border-bottom: 0; }
.map.flash { animation: flash 1.6s ease-out; }
@keyframes flash { from { background: color-mix(in srgb, var(--accent) 22%, transparent); } to { background: transparent; } }
.map-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 8px; }
.map h3 { margin: 0; font-size: var(--step-1); line-height: 1.25; }
.map h3 a { text-decoration: none; }
.map h3 a:hover { text-decoration: underline; }
.map h3 a::after { content: " ↗"; font-size: 0.8em; color: var(--ink-2); }
.map .host { display: block; margin-top: 1px; font: 400 0.75rem / 1.4 var(--font-mono); color: var(--ink-2); overflow-wrap: anywhere; }
.map .meta { margin: 6px 0 0; font-size: var(--step--1); color: var(--ink-2); }
.map .about { margin: 6px 0 0; }
.map .extra { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 8px 0 0; font-size: var(--step--1); }
.map .extra a::after { content: " ↗"; color: var(--ink-2); }
.map .tags { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0 0; }
.map .tags span { font-size: 0.72rem; color: var(--ink-2); background: var(--paper-2); border-radius: 4px; padding: 0 6px; }

/* swatches shared by chips, dots and badges */
.sw-ai, .tech-ai { --t: var(--t-ai); }
.sw-data, .tech-data { --t: var(--t-data); }
.sw-3d, .tech-3d { --t: var(--t-3d); }
.sw-classic, .tech-classic { --t: var(--t-classic); }
.sw, .pr-dots i, .tip-dots i { background: var(--t); }

.tech {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--t) 45%, transparent);
  color: var(--t);
  background: color-mix(in srgb, var(--t) 9%, transparent);
  font-size: 0.75rem;
  line-height: 1.5;
  white-space: nowrap;
}
.badge {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px dashed var(--ink-2);
  color: var(--ink-2);
  font-size: 0.75rem;
  line-height: 1.5;
  white-space: nowrap;
}

/* ---------------------------------------------------------------- controls */
.controls {
  position: absolute;
  z-index: 2;
  left: var(--gutter-l);
  bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
}
.controls button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
}
.controls button:hover { background: var(--paper-2); }
.controls button:active { transform: translateY(1px); }
.controls svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.controls svg circle { fill: currentColor; stroke: none; }
.controls #about-button svg circle:first-child { fill: none; stroke: currentColor; }
.controls .sep { width: 1px; height: 22px; background: var(--line); margin: 0 2px; }
.compass {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 36px;
  margin-left: 2px;
  border-left: 1px solid var(--line);
}
.compass svg { width: 36px; height: 36px; overflow: visible; }
.compass #compass-needle {
  transform-origin: 18px 18px;
  transition: transform 0.35s ease;
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.compass .hub { fill: var(--ink-2); }
.compass b {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -7px 0 0 -4px;
  font: 400 14px/14px var(--font-display);
  pointer-events: none;
  transition: transform 0.35s ease;
}

.coords {
  position: absolute;
  right: var(--gutter-r);
  bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  margin: 0;
  font: 400 var(--step--1) / 1 var(--font-mono);
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 6px var(--sky);
  pointer-events: none;
}

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  font: 400 var(--step-2) / 1 var(--font-display);
  color: var(--ink-2);
  pointer-events: none;
}
.loading.error { font: var(--step-0) / 1.5 var(--font-body); padding: 0 var(--gutter-r) 0 var(--gutter-l); text-align: center; }

/* ---------------------------------------------------------------- hover preview and selection pulse */
.tooltip {
  position: absolute;
  z-index: 3;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
  font-size: var(--step--1);
  line-height: 1.35;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 14px));
  white-space: nowrap;
}
.tooltip strong { font: 400 var(--step-1) / 1 var(--font-display); }
.tooltip .tip-sub { display: block; color: var(--ink-2); }
.tip-dots { display: inline-flex; gap: 3px; margin-left: 6px; vertical-align: 1px; }
.tip-dots i { width: 7px; height: 7px; border-radius: 1.5px; transform: rotate(45deg); }

.ring {
  position: absolute;
  z-index: 1;
  width: 0;
  height: 0;
  pointer-events: none;
}
.ring::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: var(--ring, 34px);
  height: var(--ring, 34px);
  border: 2px solid var(--accent);
  border-radius: 3px;
  animation: ring-pulse 1.8s ease-out infinite;
}
@keyframes ring-pulse {
  from { transform: translate(-50%, -50%) scaleY(0.5) rotate(45deg) scale(1); opacity: 0.9; }
  to { transform: translate(-50%, -50%) scaleY(0.5) rotate(45deg) scale(2.4); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .ring::after { animation: none; display: none; }
  .compass #compass-needle, .compass b { transition: none; }
  .place-pop { transition: none; }
  .map.flash { animation: none; }
}

/* ---------------------------------------------------------------- about */
.about-dialog {
  width: min(560px, calc(100% - 32px));
  max-height: min(84vh, 760px);
  padding: 24px 26px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
  overflow-y: auto;
}
.about-dialog::backdrop { background: rgb(8 17 27 / 0.45); }
.about-dialog h2 { margin: 0 32px 10px 0; font: 400 var(--step-3) / 0.95 var(--font-display); }
.about-dialog h3 { margin: 18px 0 6px; font: 400 var(--step-2) / 1 var(--font-display); }
.about-dialog p, .about-dialog li { max-width: 62ch; }
.about-dialog ul { padding-left: 18px; margin: 6px 0; }
.about-dialog li + li { margin-top: 6px; }
.about-dialog code, .about-dialog kbd { font: 0.85em var(--font-mono); background: var(--paper-2); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.about-dialog .tech { margin-right: 2px; }
.about-close { position: absolute; top: 14px; right: 14px; margin: 0; }
.about-close button {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-2);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

/* ---------------------------------------------------------------- narrow screens: popups become bottom sheets */
@media (max-width: 1000px) {
  .brand .tagline { display: none; }
}
@media (max-width: 700px) {
  .brand { top: 12px; }
  .brand h1 { font-size: 1.9rem; }
  .brand .stats { margin-top: 2px; }
  .topbar { top: 70px; left: var(--gutter-l); right: var(--gutter-r); }
  .search { flex: 1; width: auto; min-width: 0; }
  .places-button { padding: 0 11px; }
  .places-button .label { display: none; }
  .coords { display: none; }

  .pop,
  .places-pop,
  .place-pop {
    left: max(8px, env(safe-area-inset-left, 0px));
    right: max(8px, env(safe-area-inset-right, 0px));
    top: auto;
    bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    width: auto;
    border-radius: 14px;
    transform: none !important;
  }
  .places-pop { max-height: 70%; }
  .place-pop { max-height: 55%; }
  .grab {
    position: absolute;
    top: 0;
    left: 50%;
    width: 120px;
    height: 22px;
    margin-left: -60px;
    touch-action: none;
    cursor: grab;
  }
  .grab::before {
    content: "";
    position: absolute;
    top: 7px;
    left: 42px;
    width: 36px;
    height: 4px;
    border-radius: 2px;
    background: var(--line);
  }
  .grab { display: block; z-index: 1; }
  .place-body { padding-top: 18px; }
  .controls { bottom: calc(var(--sheet) + 12px + env(safe-area-inset-bottom, 0px)); transition: bottom 0.2s ease; }
  .controls button { width: 34px; height: 34px; }
}
@media (max-width: 400px) {
  #turn-left, #turn-right, .controls .sep:nth-of-type(2) { display: none; }
}