/* Arbor — modern/minimal, warm-neutral, two themes. */

:root {
  --paper:      #f3f1ec;
  --paper-2:    #fbfaf8;
  --surface:    #ffffff;
  --line:       #e3dfd6;
  --line-soft:  #edeae3;
  --ink:        #15171a;
  --ink-2:      #5d6167;
  --ink-3:      #9a9da3;
  --accent:     #2f6f4a;
  --accent-ink: #ffffff;
  --accent-wash:#e7efe9;
  --shadow:     0 1px 2px rgba(20,22,26,.05), 0 8px 26px rgba(20,22,26,.07);
  --shadow-lg:  0 2px 6px rgba(20,22,26,.07), 0 24px 60px rgba(20,22,26,.14);
  --radius:     14px;
  --panel-w:    364px;
  --ease:       cubic-bezier(.22,.61,.36,1);
}

:root[data-theme="dark"] {
  --paper:      #0d0f0e;
  --paper-2:    #121513;
  --surface:    #161917;
  --line:       #262b27;
  --line-soft:  #1e221f;
  --ink:        #eceae4;
  --ink-2:      #9aa19b;
  --ink-3:      #666d68;
  --accent:     #7fc08a;
  --accent-ink: #0d1510;
  --accent-wash:#1b241d;
  --shadow:     0 1px 2px rgba(0,0,0,.4), 0 8px 26px rgba(0,0,0,.4);
  --shadow-lg:  0 2px 6px rgba(0,0,0,.5), 0 24px 60px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}
body { transition: background .45s var(--ease), color .45s var(--ease); }
.mono { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace; }

button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
svg { width: 18px; height: 18px; display: block; }

/* ------------------------------------------------------------ layout --- */

.app {
  display: grid;
  grid-template-columns: var(--panel-w) 1fr;
  height: 100dvh;
  transition: grid-template-columns .5s var(--ease);
}
.app.collapsed { grid-template-columns: 0 1fr; }

.panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--paper-2);
  border-right: 1px solid var(--line);
  overflow: hidden;
  transition: background .45s var(--ease), border-color .45s var(--ease);
}
.app.collapsed .panel { border-right-color: transparent; }

.stage {
  position: relative;
  min-width: 0;
  overflow: hidden;
}
#view { display: block; width: 100%; height: 100%; }

/* ------------------------------------------------------------- brand --- */

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--line-soft);
  flex: none;
}
.brand-mark {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--accent);
  background: var(--surface);
}
.brand-mark svg { width: 21px; height: 21px; }
.brand-text { flex: 1; min-width: 0; }
.brand h1 {
  margin: 0;
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  font-size: 25px;
  letter-spacing: -.01em;
  line-height: 1.05;
}
.brand p {
  margin: 2px 0 0;
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.icon-btn {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 9px;
  color: var(--ink-2);
  transition: background .18s, color .18s, transform .18s var(--ease);
}
.icon-btn:hover { background: var(--line-soft); color: var(--ink); }
.icon-btn:active { transform: scale(.94); }
.icon-btn[data-on="true"] { color: var(--accent); background: var(--accent-wash); }

/* ---------------------------------------------------------- controls --- */

.panel-scroll {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 4px 0 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.panel-scroll::-webkit-scrollbar { width: 10px; }
.panel-scroll::-webkit-scrollbar-thumb {
  background: var(--line); border-radius: 99px;
  border: 3px solid var(--paper-2);
}

.section { border-bottom: 1px solid var(--line-soft); }
.section-head {
  display: flex; align-items: center; gap: 10px;
  width: 100%;
  padding: 14px 20px;
  text-align: left;
}
.section-head .num {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 15px;
  color: var(--ink-3);
  width: 16px;
}
.section-head .title {
  flex: 1;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.section-head .chev {
  color: var(--ink-3);
  transition: transform .3s var(--ease);
}
.section[data-open="true"] .chev { transform: rotate(90deg); }
.section-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .38s var(--ease);
}
.section[data-open="true"] .section-body { grid-template-rows: 1fr; }
.section-body > div { overflow: hidden; }
.section-inner { padding: 2px 20px 18px; display: grid; gap: 13px; }

/* rows */
.row { display: grid; gap: 7px; }
.row-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
}
.row-head label { font-size: 12.5px; color: var(--ink-2); }
.row-head .val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink);
  background: var(--line-soft);
  padding: 2px 6px;
  border-radius: 5px;
  font-variant-numeric: tabular-nums;
  transition: background .2s, color .2s;
}
.row.live .val { background: var(--accent-wash); color: var(--accent); }

input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 18px; background: transparent; cursor: grab;
}
input[type=range]:active { cursor: grabbing; }
input[type=range]::-webkit-slider-runnable-track {
  height: 3px; border-radius: 99px;
  background: linear-gradient(90deg, var(--accent) var(--fill,0%), var(--line) var(--fill,0%));
}
input[type=range]::-moz-range-track { height: 3px; border-radius: 99px; background: var(--line); }
input[type=range]::-moz-range-progress { height: 3px; border-radius: 99px; background: var(--accent); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px; margin-top: -5.5px;
  border-radius: 50%;
  background: var(--surface);
  border: 1.5px solid var(--accent);
  box-shadow: var(--shadow);
  transition: transform .15s var(--ease);
}
input[type=range]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--surface); border: 1.5px solid var(--accent);
}
input[type=range]:hover::-webkit-slider-thumb { transform: scale(1.18); }

select, input[type=number] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  appearance: none;
  transition: border-color .2s, box-shadow .2s;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239a9da3' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 15px;
  padding-right: 28px;
}
select:focus, input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }

input[type=color] {
  width: 100%; height: 30px; padding: 2px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--surface); cursor: pointer;
}
.row-colors { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* segmented control */
.seg {
  display: flex; gap: 2px; padding: 3px;
  background: var(--line-soft);
  border-radius: 10px;
}
.seg button {
  flex: 1; padding: 6px 4px;
  font-size: 12px; color: var(--ink-2);
  border-radius: 7px;
  white-space: nowrap;
  transition: background .2s, color .2s, box-shadow .2s;
}
.seg button[aria-pressed="true"] {
  background: var(--surface); color: var(--ink);
  box-shadow: var(--shadow);
  font-weight: 500;
}

/* species chips */
.species {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.chip {
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  font-size: 12px;
  text-align: left;
  line-height: 1.25;
  color: var(--ink-2);
  transition: border-color .2s, color .2s, transform .2s var(--ease), background .2s;
}
.chip:hover { transform: translateY(-1px); border-color: var(--ink-3); color: var(--ink); }
.chip[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-wash);
  color: var(--accent);
  font-weight: 500;
}
.note {
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--ink-3);
  font-style: italic;
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 13px;
}

.seed-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.seed-row button {
  width: 38px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 9px; background: var(--surface);
  color: var(--ink-2);
  transition: color .2s, border-color .2s;
}
.seed-row button:hover { color: var(--accent); border-color: var(--accent); }

/* ------------------------------------------------------------- footer -- */

.panel-foot {
  flex: none;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--line-soft);
  background: var(--paper-2);
}
.foot-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px; font-weight: 500;
  transition: transform .18s var(--ease), background .2s, box-shadow .2s, opacity .2s;
}
.btn:active { transform: scale(.975); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow); }
.btn-primary:hover { box-shadow: var(--shadow-lg); }
.btn-ghost { border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); }
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-3); }

.export { position: relative; }
.export .btn { width: 100%; }
.menu {
  position: absolute; bottom: calc(100% + 8px); right: 0;
  width: 232px; padding: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 40;
  animation: pop .2s var(--ease);
}
@keyframes pop { from { opacity: 0; transform: translateY(6px) scale(.98); } }
.menu button {
  display: block; width: 100%; padding: 8px 10px; border-radius: 8px; text-align: left;
  transition: background .15s;
}
.menu button:hover { background: var(--line-soft); }
.menu button:disabled { opacity: .4; cursor: not-allowed; background: none; }
.menu .seg { margin-bottom: 4px; }
.menu .seg button { padding: 6px 4px; text-align: center; font-size: 12px; }
.menu .seg button[aria-pressed="true"] { background: var(--surface); }
.menu b { display: block; font-size: 12.5px; font-weight: 600; }
.menu span { display: block; font-size: 11px; color: var(--ink-3); margin-top: 1px; }

/* ---------------------------------------------------------------- hud -- */

.hud {
  position: absolute;
  pointer-events: none;
  z-index: 10;
}
.hud-title { top: 18px; left: 20px; display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  padding: 5px 10px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  border: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--ink-2);
  backdrop-filter: blur(8px);
}
.tag:first-child { color: var(--ink); font-weight: 500; }

.stats {
  bottom: 18px; left: 20px;
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: .02em;
  line-height: 1.6;
  white-space: pre;
}

.toolbar {
  position: absolute; top: 14px; right: 16px;
  display: flex; gap: 3px;
  padding: 4px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  z-index: 20;
}

.lod-bar {
  position: absolute; top: 64px; right: 16px; z-index: 20;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}
.lod-bar button { flex: none; padding: 5px 8px; font-size: 11px; }

.floating {
  position: absolute; top: 14px; left: 14px; z-index: 20;
  background: var(--surface); border: 1px solid var(--line);
  opacity: 0; pointer-events: none;
  transition: opacity .3s var(--ease);
}
.app.collapsed .show-panel { opacity: 1; pointer-events: auto; }

.working[hidden] { display: none; }
.working {
  position: absolute; bottom: 18px; right: 20px; z-index: 20;
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-3);
}
.working span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  animation: pulse 1s infinite var(--ease);
}
@keyframes pulse { 0%,100% { opacity: .25; transform: scale(.8); } 50% { opacity: 1; transform: scale(1.25); } }

.sheet-grip { display: none; }

/* --------------------------------------------------------- responsive -- */

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }
  .app.collapsed { grid-template-columns: 1fr; }
  .stage { grid-row: 1; }
  .panel {
    grid-row: 2;
    border-right: 0;
    border-top: 1px solid var(--line);
    border-radius: 18px 18px 0 0;
    max-height: 56dvh;
    box-shadow: var(--shadow-lg);
    transition: max-height .45s var(--ease);
  }
  .app.collapsed .panel { max-height: 58px; }
  .sheet-grip {
    display: block;
    width: 100%; height: 22px;
    flex: none;
    position: relative;
  }
  .sheet-grip::after {
    content: ''; position: absolute; left: 50%; top: 9px;
    width: 38px; height: 4px; margin-left: -19px;
    border-radius: 99px; background: var(--line);
  }
  .brand { padding: 4px 16px 12px; }
  .brand h1 { font-size: 21px; }
  #collapse { display: none; }
  .show-panel { display: none; }
  .section-inner, .section-head { padding-left: 16px; padding-right: 16px; }
  .panel-foot { padding: 10px 16px calc(12px + env(safe-area-inset-bottom)); }
  .toolbar { top: 12px; right: 12px; }
  .lod-bar { top: 62px; right: 12px; }
  .hud-title { top: 14px; left: 14px; }
  .stats { bottom: 12px; left: 14px; }
  .working { bottom: 12px; right: 14px; }
  .species { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ------------------------------------------------------------ toolbar --- */

.tool-sep {
  width: 1px;
  align-self: stretch;
  margin: 4px 2px;
  background: var(--line);
}

/* ------------------------------------------------- randomise button ----- */

.btn-wild {
  border: 1px solid var(--accent);
  background: var(--accent-wash);
  color: var(--accent);
}
.btn-wild:hover { background: var(--accent); color: var(--accent-ink); }
.foot-row + .foot-row { margin-top: 8px; }
.foot-row-single { grid-template-columns: 1fr; }

/* ---------------------------------------------------------- info modal -- */

.modal {
  width: min(640px, calc(100vw - 32px));
  max-height: min(78dvh, 760px);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.modal::backdrop {
  background: color-mix(in srgb, var(--ink) 38%, transparent);
  backdrop-filter: blur(3px);
}
.modal[open] { animation: modal-in .32s var(--ease); }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(12px) scale(.985); }
}

.modal-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 22px 16px;
}
.modal-head h2 {
  margin: 0;
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.01em;
}
.modal-head p {
  margin: 5px 0 0;
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: .03em;
}
.modal-head > div { flex: 1; min-width: 0; }

.modal-tabs {
  display: flex;
  gap: 20px;
  padding: 0 22px;
  border-bottom: 1px solid var(--line-soft);
}
.modal-tabs button {
  position: relative;
  padding: 0 0 11px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-3);
  transition: color .2s;
}
.modal-tabs button::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform .28s var(--ease);
}
.modal-tabs button:hover { color: var(--ink-2); }
.modal-tabs button[aria-selected="true"] { color: var(--ink); }
.modal-tabs button[aria-selected="true"]::after { transform: scaleX(1); }

.modal-body {
  padding: 4px 22px 24px;
  overflow-y: auto;
  max-height: calc(78dvh - 140px);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.modal-body::-webkit-scrollbar { width: 10px; }
.modal-body::-webkit-scrollbar-thumb {
  background: var(--line); border-radius: 99px; border: 3px solid var(--surface);
}
.modal-body section { animation: fade-in .3s var(--ease); }
@keyframes fade-in { from { opacity: 0; transform: translateY(5px); } }

.modal-body h3 {
  margin: 24px 0 7px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.modal-body p { margin: 0 0 11px; font-size: 13.5px; line-height: 1.62; color: var(--ink-2); }
.modal-body .lede {
  margin-top: 16px;
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
}
.modal-body .credit {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 25px;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 3px;
}
.modal-body .muted { color: var(--ink-3); font-size: 12.5px; }
.modal-body .small { font-size: 11.5px; margin-top: 22px; }
.modal-body ul { margin: 0 0 12px; padding-left: 18px; }
.modal-body li {
  font-size: 13.5px; line-height: 1.6; color: var(--ink-2); margin-bottom: 6px;
}
.modal-body b { color: var(--ink); font-weight: 600; }
.modal-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.modal-body a:hover { border-bottom-color: currentColor; }
.modal-body blockquote {
  margin: 10px 0 14px;
  padding: 12px 14px;
  border-left: 2px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--line-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-2);
}
.modal-body .refs li { font-size: 12.5px; color: var(--ink-3); }
.modal-body .refs b, .modal-body .refs i { color: var(--ink-2); }

@media (max-width: 900px) {
  .modal { width: calc(100vw - 20px); max-height: 86dvh; }
  .modal-body { max-height: calc(86dvh - 132px); padding: 4px 18px 22px; }
  .modal-head { padding: 18px 18px 14px; }
  .modal-tabs { padding: 0 18px; }
}