/* styles.css — cartographic field-guide design system.
   Paper cards over the 3D world, ink typography, rope-orange accents.
   Map-annotation labels, atlas navigation, chapter panel, ending veil. */

:root {
  --paper: #f6f1e5;
  --paper-shade: #e9e2cf;
  --ink: #2b2a26;
  --ink-soft: #6b5c44;
  --rope: #e07f36;
  --rope-deep: #b9541f;
  --navy: #232c40;
  --navy-deep: #161d2c;
  --amber: #f2b544;
  --cyan: #4fd6e0;
  --line: rgba(43, 42, 38, 0.22);
  --shadow: 0 18px 40px rgba(22, 29, 44, 0.22);
  --serif: Georgia, 'Times New Roman', serif;
  --sans: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --panel-w: 384px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: #dfe7ee;
  -webkit-font-smoothing: antialiased;
}

#scene { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
#labels { position: fixed; inset: 0; overflow: hidden; pointer-events: none; z-index: 2; }

/* ------------------------------------------------------------ typography --- */
.kicker {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rope-deep);
  margin: 0 0 6px;
}
.credit { font-size: 11.5px; color: var(--ink-soft); font-style: italic; }

/* ---------------------------------------------------------------- buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  font: 700 13.5px/1 var(--sans);
  padding: 11px 16px; border-radius: 999px;
  border: 1.5px solid var(--ink);
  cursor: pointer; text-decoration: none;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--rope); color: #fff8ef; border-color: var(--rope-deep); box-shadow: 0 4px 0 var(--rope-deep); }
.btn--primary:hover { box-shadow: 0 5px 0 var(--rope-deep); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); background: rgba(43, 42, 38, 0.05); }
.btn--small { padding: 8px 12px; font-size: 12px; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }

.hud-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font: 700 11px/1 var(--sans); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink); background: var(--paper);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 12px; cursor: pointer;
  box-shadow: 0 2px 8px rgba(22, 29, 44, 0.12);
  transition: background 0.15s ease, transform 0.15s ease;
}
.hud-btn:hover { background: #fffdf6; transform: translateY(-1px); }
.hud-btn.is-active { background: var(--navy); color: var(--paper); }
.hud-btn[aria-pressed="true"] { background: var(--navy); color: var(--paper); }

/* ------------------------------------------------------------------- hud --- */
.hud {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px; z-index: 5; pointer-events: none;
}
.hud > * { pointer-events: auto; }
.wordmark {
  display: inline-flex; align-items: center; gap: 9px;
  color: var(--ink); text-decoration: none;
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px;
  padding: 8px 13px; box-shadow: 0 2px 8px rgba(22, 29, 44, 0.12);
}
.wordmark__text { font: 700 13px/1.1 var(--serif); }
.wordmark__text em { display: block; font: italic 400 10.5px/1 var(--serif); color: var(--ink-soft); letter-spacing: 0.04em; margin-top: 2px; }
.hud__buttons { display: flex; gap: 8px; }

/* ------------------------------------------------------------------ hero --- */
.overlay-card {
  position: fixed; z-index: 6;
  left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: min(620px, calc(100vw - 40px));
  background: var(--paper);
  border: 1px solid var(--line); border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 34px 38px 26px;
  text-align: center;
}
.overlay-card::before {
  content: ''; position: absolute; inset: 7px;
  border: 1px dashed rgba(43, 42, 38, 0.28); border-radius: 12px; pointer-events: none;
}
#hero h1 { font: 700 clamp(34px, 6vw, 52px)/1.04 var(--serif); margin: 2px 0 14px; }
.hero__sub { font: 400 15.5px/1.55 var(--sans); color: #46433c; margin: 0 auto 20px; max-width: 46ch; }
.hero__hint { font-size: 11.5px; letter-spacing: 0.05em; color: var(--ink-soft); margin: 16px 0 10px; text-transform: uppercase; }
#hero.is-hidden, #panel.is-hidden { display: none; }

/* ----------------------------------------------------------------- panel --- */
#panel {
  position: fixed; z-index: 6;
  left: 20px; bottom: 20px;
  width: var(--panel-w); max-height: min(66vh, 620px);
  display: flex; flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.32s cubic-bezier(0.5, 0, 0.2, 1);
}
#panel.is-collapsed .panel__body-wrap { display: none; }
#panel.is-collapsed .panel__nav { display: none; }
.panel__toggle {
  position: absolute; top: 12px; right: 12px; z-index: 1;
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--paper-shade);
  color: var(--ink); cursor: pointer;
  display: grid; place-items: center;
}
#panel.is-collapsed .panel__toggle svg { transform: rotate(180deg); }
.panel__head {
  padding: 16px 46px 10px 20px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 88% -30%, rgba(224, 127, 54, 0.16), transparent 58%),
    linear-gradient(var(--paper), var(--paper));
}
.panel__head h2 { font: 700 22px/1.15 var(--serif); margin: 0 0 4px; }
.panel__prog { font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin: 0; }
.panel__body-wrap { padding: 14px 20px 16px; overflow-y: auto; scrollbar-width: thin; }
#panel-body p { font: 400 14px/1.58 var(--sans); margin: 0 0 10px; color: #3d3a33; }
#panel-body strong { color: var(--ink); }
#panel-body em { color: var(--rope-deep); }
.panel__hints { margin: 12px 0 0; padding: 10px 12px 10px 30px; list-style: disc; background: var(--paper-shade); border-radius: 10px; }
.panel__hints li { font: 500 12.5px/1.45 var(--sans); color: var(--ink-soft); margin: 3px 0; }
#panel-actions { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.panel__nav {
  display: flex; justify-content: space-between; gap: 8px;
  padding: 12px 20px; border-top: 1px solid var(--line); background: var(--paper-shade);
}
#nav-prev[disabled], #nav-next[disabled] { opacity: 0.35; cursor: default; }

/* --------------------------------------------------- chapter action rows --- */
.loop-controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.scrub { position: relative; margin-top: 14px; padding-bottom: 18px; }
.scrub input[type="range"] { width: 100%; accent-color: var(--rope-deep); cursor: ew-resize; margin: 0; }
.scrub__marks { position: absolute; top: 13px; left: 0; right: 0; height: 0; pointer-events: none; }
.scrub__diamond {
  position: absolute; transform: translateX(-50%) rotate(45deg);
  width: 9px; height: 9px; background: var(--amber);
  border: 1.5px solid var(--rope-deep); border-radius: 2px;
}
.scrub__legend { position: absolute; right: 0; bottom: 0; font-size: 10.5px; letter-spacing: 0.06em; color: var(--ink-soft); text-transform: uppercase; }

/* ---------------------------------------------------- 3D-anchored labels --- */
.label {
  position: absolute; left: 0; top: 0;
  font: 700 calc(11px * var(--lscale, 1))/1.3 var(--sans);
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink); background: rgba(246, 241, 229, 0.94);
  border: 1px solid rgba(43, 42, 38, 0.4);
  border-radius: 6px; padding: 3px 7px;
  white-space: nowrap;
  transition: opacity 0.25s ease;
}
.label.is-hidden { opacity: 0; visibility: hidden; }
.label.is-behind { opacity: 0.18; }
.label__chip {
  display: inline-grid; place-items: center;
  min-width: 15px; height: 15px; padding: 0 3px; margin-right: 6px;
  background: var(--rope-deep); color: #fff8ef;
  border-radius: 4px; font-size: 0.82em;
}
.label--callout, .label--stepcap, .label--match {
  white-space: normal; max-width: 240px; text-align: center;
  border-left: 3px solid var(--rope); border-radius: 6px 8px 8px 6px;
}
.label--stepcap {
  font: 500 calc(12.5px * var(--lscale, 1))/1.42 var(--sans);
  letter-spacing: 0.01em; text-transform: none;
  background: rgba(246, 241, 229, 0.96);
  box-shadow: 0 4px 14px rgba(22, 29, 44, 0.18);
}
.label--match { border-left-color: var(--cyan); }
.label.is-lit { border-color: var(--rope-deep); box-shadow: 0 0 0 2px rgba(242, 181, 68, 0.55), 0 4px 14px rgba(22, 29, 44, 0.2); }

/* ------------------------------------------------------------ travel chip --- */
#travel-chip {
  position: fixed; z-index: 5; left: 50%; bottom: 30px;
  transform: translate(-50%, 90px);
  background: var(--navy); color: var(--paper);
  font: 700 12px/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase;
  padding: 12px 20px; border-radius: 999px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
  pointer-events: none;
}
#travel-chip.is-on { transform: translate(-50%, 0); }

/* ------------------------------------------------------------------ atlas --- */
#atlas {
  position: fixed; z-index: 7;
  right: 20px; top: 76px; bottom: 20px; width: 348px;
  display: flex; flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 14px;
  transform: translateX(calc(100% + 40px));
  transition: transform 0.34s cubic-bezier(0.5, 0, 0.2, 1);
}
#atlas.is-open { transform: translateX(0); }
.atlas__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.atlas__head h2 { font: 700 17px/1 var(--serif); margin: 0; }
#atlas-svg { width: 100%; flex: 1; min-height: 0; }
.atlas__note { font: 400 11.5px/1.5 var(--sans); color: var(--ink-soft); margin: 8px 4px 2px; }

.atlas-contour { fill: none; stroke: rgba(43, 42, 38, 0.13); stroke-dasharray: 3 4; }
.atlas-route { fill: none; stroke: var(--rope-deep); stroke-width: 2; stroke-dasharray: 5 5; stroke-linecap: round; }
.atlas-border line { stroke: var(--ink-soft); stroke-width: 1.4; stroke-dasharray: 2 3; }
.atlas-border text { font: 600 7.5px var(--sans); letter-spacing: 0.16em; fill: var(--ink-soft); }
.atlas-node { cursor: pointer; }
.atlas-node__hit { fill: transparent; }
.atlas-node__ring { fill: var(--paper); stroke: rgba(43, 42, 38, 0.5); stroke-width: 1.6; transition: stroke 0.2s ease; }
.atlas-node__dot { fill: var(--navy); transition: fill 0.2s ease; }
.atlas-node__num { font: 700 8px var(--sans); fill: var(--paper); text-anchor: middle; }
.atlas-node__label { font: 700 6.6px var(--sans); letter-spacing: 0.12em; fill: var(--ink-soft); text-anchor: middle; }
.atlas-node:hover .atlas-node__ring { stroke: var(--rope-deep); }
.atlas-node.is-current .atlas-node__dot { fill: var(--rope-deep); }
.atlas-node.is-current .atlas-node__ring { stroke: var(--rope-deep); stroke-width: 2.4; }
.atlas-node.is-visited .atlas-node__dot { fill: var(--ink-soft); }
.atlas-compass circle { fill: none; stroke: rgba(43, 42, 38, 0.4); }
.atlas-compass path { fill: var(--ink-soft); }
.atlas-compass text { font: 700 7px var(--sans); fill: var(--ink-soft); text-anchor: middle; }
.atlas-scale line { stroke: var(--ink-soft); stroke-width: 1.2; }
.atlas-scale text { font: 600 7px var(--sans); fill: var(--ink-soft); }

/* ------------------------------------------------------------------ toast --- */
#toast {
  position: fixed; z-index: 8; left: 50%; bottom: 24px;
  transform: translate(-50%, 100px);
  max-width: min(520px, calc(100vw - 40px));
  background: rgba(22, 29, 44, 0.94); color: var(--paper);
  font: 500 13px/1.4 var(--sans);
  padding: 12px 18px; border-radius: 12px;
  border: 1px solid rgba(246, 241, 229, 0.22);
  text-align: center;
  transition: transform 0.28s ease, opacity 0.28s ease;
  opacity: 0; pointer-events: none;
}
#toast.is-on { transform: translate(-50%, 0); opacity: 1; }

/* ----------------------------------------------------------------- ending --- */
#ending {
  position: fixed; inset: 0; z-index: 9;
  display: grid; place-items: center;
  background: rgba(15, 20, 32, 0.66);
  backdrop-filter: blur(3px);
  opacity: 0; visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#ending.is-on { opacity: 1; visibility: visible; }
.ending__card {
  background: var(--navy-deep); color: var(--paper);
  border: 1px solid rgba(242, 181, 68, 0.6); border-radius: 20px;
  box-shadow: 0 30px 80px rgba(8, 10, 18, 0.5);
  padding: 40px 46px; text-align: center;
  max-width: min(620px, calc(100vw - 48px));
  transform: translateY(14px);
  transition: transform 0.5s cubic-bezier(0.3, 0.9, 0.3, 1.2);
}
#ending.is-on .ending__card { transform: translateY(0); }
.ending__line { font: 700 clamp(24px, 4.6vw, 36px)/1.2 var(--serif); margin: 14px 0 10px; color: #ffd9a0; }
.ending__sub { font: 400 15px/1.5 var(--sans); color: #c8d4e6; margin: 0; }

/* ---------------------------------------------------------------- loading --- */
#loading {
  position: fixed; inset: 0; z-index: 10;
  display: grid; place-items: center;
  background: var(--paper);
  transition: opacity 0.6s ease;
}
#loading.is-done { opacity: 0; pointer-events: none; }
.loading__inner { text-align: center; width: min(300px, 76vw); }
.loading__title { font: 700 21px/1.2 var(--serif); margin: 12px 0 18px; }
.load-bar { height: 5px; border-radius: 99px; background: var(--paper-shade); overflow: hidden; border: 1px solid var(--line); }
#load-bar-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--rope), var(--rope-deep)); transition: width 0.25s ease; }
#load-label { font: 500 12px/1 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); margin-top: 12px; }

/* ----------------------------------------------------------------- mobile --- */
@media (max-width: 760px) {
  .hud { padding: 10px 10px; }
  .wordmark { padding: 7px 10px; }
  .wordmark__text { font-size: 11.5px; }
  .wordmark__text em { display: none; }
  .hud-btn span { display: none; }
  .hud-btn { padding: 10px; }
  .hud-btn svg { width: 17px; height: 17px; }

  .overlay-card { padding: 24px 20px 18px; }
  #hero h1 { font-size: clamp(30px, 9vw, 40px); }
  .hero__sub { font-size: 14px; }

  #panel {
    left: 10px; right: 10px; bottom: 10px; width: auto;
    max-height: 46vh;
  }
  .panel__head { padding: 13px 44px 8px 16px; }
  .panel__head h2 { font-size: 18px; }
  .panel__body-wrap { padding: 11px 16px 13px; }
  #panel-body p { font-size: 13px; }
  .panel__nav { padding: 10px 16px; }

  #atlas {
    left: 10px; right: 10px; top: 64px; bottom: 10px; width: auto;
    transform: translateY(calc(100% + 80px));
  }
  #atlas.is-open { transform: translateY(0); }

  .label { font-size: calc(10px * var(--lscale, 1)); }
  .label--callout, .label--match { max-width: 180px; }
  .label--stepcap { max-width: 210px; font-size: calc(12px * var(--lscale, 1)); }

  #travel-chip { bottom: 18px; max-width: calc(100vw - 32px); text-align: center; }
  #toast { bottom: 64px; font-size: 12px; }
  .ending__card { padding: 26px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01s !important; }
}