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

:root {
  --bg:       #0a0e0a;
  --surface:  #0f140f;
  --green:    #39ff14;
  --green-dim:#1a7a00;
  --green-mid:#22aa00;
  --amber:    #ffa500;
  --muted:    #2a3a2a;
  --border:   #1e3a1e;
  --red:      #ff4040;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--green);
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 0 16px;
}

/* ── Header ──────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 18px 0 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.logo {
  font-size: 18px;
  font-weight: bold;
  letter-spacing: 2px;
  text-shadow: 0 0 8px var(--green);
}

.tagline {
  color: var(--green-dim);
  font-size: 12px;
  letter-spacing: 1px;
}

/* ── Main ────────────────────────────────────────────────────── */
main {
  flex: 1;
  width: 100%;
}

/* ── Drop Zone ───────────────────────────────────────────────── */
#upload-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
}

#drop-zone {
  width: 100%;
  max-width: 540px;
  border: 2px dashed var(--green-dim);
  border-radius: 4px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  outline: none;
}

#drop-zone:hover,
#drop-zone:focus,
#drop-zone.drag-over {
  border-color: var(--green);
  background: rgba(57, 255, 20, 0.04);
}

#drop-zone.drag-over {
  background: rgba(57, 255, 20, 0.08);
}

.drop-icon {
  font-size: 40px;
  color: var(--green-dim);
  margin-bottom: 16px;
  text-shadow: 0 0 12px var(--green-dim);
}

.drop-text {
  font-size: 16px;
  letter-spacing: 1px;
  color: var(--green-mid);
  margin-bottom: 6px;
}

.drop-sub {
  font-size: 11px;
  color: var(--green-dim);
}

.upload-privacy {
  font-size: 10px;
  opacity: 0.65;
  letter-spacing: 0;
  text-align: center;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  width: 100%;
}

/* Compact state — while a result is shown below */
#upload-section.compact #drop-zone {
  padding: 10px 20px;
  border-width: 1px;
}
#upload-section.compact .drop-icon,
#upload-section.compact .drop-sub,
#upload-section.compact .upload-privacy {
  display: none;
}
#upload-section.compact .drop-text {
  font-size: 11px;
  letter-spacing: 1px;
  margin: 0;
}

#section-sep {
  border: none;
  border-top: 1px solid var(--border);
  width: 100%;
  max-width: 960px;
  margin: 20px auto;
}

.error-msg {
  color: var(--red);
  margin-top: 16px;
  font-size: 13px;
}

/* ── Loading ─────────────────────────────────────────────────── */
#loading-section {
  text-align: center;
  padding: 60px 0;
}

.loading-text {
  font-size: 16px;
  color: var(--green-mid);
  letter-spacing: 2px;
}

@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.blink { animation: blink 1s step-start infinite; }

@keyframes ellipsis {
  0%   { content: '.'; }
  33%  { content: '..'; }
  66%  { content: '...'; }
}
.ellipsis::after {
  content: '';
  animation: ellipsis 1.2s step-start infinite;
}
.ellipsis { font-size: 0; }
.ellipsis::after { font-size: 16px; }

/* ── Stats Bar ───────────────────────────────────────────────── */
#stats-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  padding: 10px 0 14px;
  font-size: 12px;
  color: var(--green-mid);
  letter-spacing: 1px;
  border-bottom: 1px solid var(--border);
  margin: 0 auto 12px;
}

#stats-bar span strong {
  color: var(--green);
}

/* ── Route title ─────────────────────────────────────────────── */
.route-title {
  font-family: 'Courier New', Courier, monospace;
  font-size: 15px;
  font-weight: bold;
  color: var(--green);
  text-shadow: 0 0 8px var(--green);
  letter-spacing: 2px;
  text-align: center;
  padding: 8px 0 6px;
}

/* ── Elevation output ────────────────────────────────────────── */
.elev-output {
  font-family: 'Courier New', Courier, monospace;
  font-size: 10px;
  font-weight: normal;
  line-height: 1.2;
  white-space: pre;
  display: block;
  text-align: center;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--green-dim) var(--surface);
}

/* ── Map attribution ─────────────────────────────────────────── */
.map-attribution {
  font-size: 11px;
  color: var(--green-dim);
  letter-spacing: 1px;
  text-align: center;
  padding: 4px 0 8px;
}

.map-attribution a {
  color: inherit;
  text-decoration: none;
}

.map-attribution a:hover {
  color: var(--green-mid);
}

/* ── ASCII Map ───────────────────────────────────────────────── */
.map-wrapper {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 8px;
  text-align: center;
  /* Thin scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--green-dim) var(--surface);
}

.map-wrapper::-webkit-scrollbar { height: 4px; }
.map-wrapper::-webkit-scrollbar-track { background: var(--surface); }
.map-wrapper::-webkit-scrollbar-thumb { background: var(--green-dim); }

#ascii-output {
  font-family: 'Courier New', Courier, monospace;
  font-size: 8px;
  font-weight: normal;
  line-height: 1.2;
  white-space: pre;
  color: var(--green);
  text-shadow: 0 0 4px rgba(57, 255, 20, 0.35);
  display: inline-block;
  min-width: max-content;
}

/* Route draw — opacity only so the compositor handles it without main-thread repaints.
   --scroll-offset delays everything until after the smooth scroll lands. */
@keyframes route-draw {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Re-flash when the route doubles back — brightness pulse is compositor-friendly. */
@keyframes route-revisit {
  0%   { filter: brightness(5); }
  100% { filter: none; }
}

#ascii-output .route {
  color: var(--green);
  font-weight: bold;
  text-shadow: 0 0 8px var(--green), 0 0 18px var(--green), 0 0 2px #000, 0 0 4px #000;
  animation: route-draw 350ms ease-out calc(var(--scroll-offset, 0ms) + var(--d1, 0ms)) both;
}

#ascii-output .route.revisit {
  animation: route-draw 350ms ease-out calc(var(--scroll-offset, 0ms) + var(--d1, 0ms)) both,
             route-revisit 450ms ease-out calc(var(--scroll-offset, 0ms) + var(--d2, 0ms)) forwards;
}

@media (prefers-reduced-motion: reduce) {
  #ascii-output .route,
  #ascii-output .route.revisit { animation: none; }
}
#ascii-output .bg     { color: var(--green-dim); }
#ascii-output .marker { color: var(--amber); }
@keyframes elev-draw {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.elev {
  color: var(--amber);
  font-weight: bold;
  text-shadow: 0 0 4px rgba(255, 165, 0, 0.4);
  animation: elev-draw 300ms linear calc(var(--scroll-offset, 0ms) + var(--d, 0ms)) both;
}

#elev-output .bg { color: var(--green-dim); }

@media (prefers-reduced-motion: reduce) {
  .elev { animation: none; }
}
/* Replay — disable animations momentarily so the browser treats the re-add as a fresh start */
#ascii-output.no-animate .route { animation: none; }
#elev-output.no-animate .elev   { animation: none; }

#ascii-output .label  { color: #f5f5f5; letter-spacing: 0; }

/* Terrain — color shading from west light (s0 = lit face, s2 = neutral, s4 = shadow) */
#ascii-output .water          { color: #5bc8f5; }
#ascii-output .nature.s0      { color: #72c272; }
#ascii-output .nature.s1      { color: #5c9460; }
#ascii-output .nature.s2      { color: #4a7a4a; }
#ascii-output .nature.s3      { color: #38603a; }
#ascii-output .nature.s4      { color: #264428; }
#ascii-output .land.s0        { color: #dcbe80; }
#ascii-output .land.s1        { color: #ccb074; }
#ascii-output .land.s2        { color: #c4a46b; }
#ascii-output .land.s3        { color: #a6844e; }
#ascii-output .land.s4        { color: #846434; }
#ascii-output .urban.s0       { color: #a8baa8; }
#ascii-output .urban.s1       { color: #96a896; }
#ascii-output .urban.s2       { color: #8a9a8a; }
#ascii-output .urban.s3       { color: #6c7c6c; }
#ascii-output .urban.s4       { color: #4e5e4e; }

/* ── Action Bar ──────────────────────────────────────────────── */
.action-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.btn {
  background: none;
  border: 1px solid var(--green-mid);
  color: var(--green-mid);
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 1px;
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.15s;
  outline: none;
}

.btn:hover, .btn:focus {
  border-color: var(--green);
  color: var(--green);
  text-shadow: 0 0 6px var(--green);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.2);
}

.btn-dim {
  border-color: var(--muted);
  color: var(--green-dim);
}

.btn-dim:hover, .btn-dim:focus {
  border-color: var(--green-mid);
  color: var(--green-mid);
  text-shadow: none;
  box-shadow: none;
}

.feedback {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 1px;
  animation: fadeout 2.5s forwards;
}

@keyframes fadeout {
  0%, 60% { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  padding: 16px 0;
  margin-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--green-dim);
  font-size: 11px;
  letter-spacing: 1px;
  text-align: center;
}