:root {
  color-scheme: light;
  --bg: #f7f6f2;
  --surface: #fffefbf0;
  --fg: #252826;
  --muted: #626760;
  --accent: #252826;
  --border: #ddded9;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg) url('../assets/paper-texture.webp') repeat;
  background-size: 900px auto;
  color: var(--fg);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  overflow: hidden;
}
button { font: inherit; color: inherit; cursor: pointer; }

/* ---------- Viewer ---------- */
#viewer { position: fixed; inset: 0; background: transparent; }
#overview {
  position: fixed; inset: 0; z-index: 10;
  display: grid; place-items: center; overflow: hidden;
  background: inherit; pointer-events: none;
}
#overview-frame {
  position: relative; display: block;
  max-width: 100vw; max-height: 100dvh;
  transform-origin: 0 0;
  box-shadow: 0 2px 24px #00000018, 0 1px 6px #00000022;
}
#overview-frame::after {
  content: ''; position: absolute; inset: var(--artwork-inset); z-index: 1;
  background: linear-gradient(#00000040, #0000001a 45%, #00000050);
  pointer-events: none;
}
#overview-image {
  display: block; width: auto; height: auto; max-width: 100vw; max-height: 100dvh;
  transform-origin: 0 0;
}

/* ---------- Top bar ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; pointer-events: none;
  background: linear-gradient(#f7f6f2e6, transparent);
  opacity: 0; visibility: hidden; transition: opacity 0.3s ease;
}
.topbar > * { pointer-events: auto; }
body[data-stage='exploring'] .topbar { opacity: 1; visibility: visible; }
.brand { font-weight: 700; font-size: 1rem; letter-spacing: 0.02em; }
.brand small { display: block; font-weight: 400; font-size: 0.72rem; color: var(--muted); }
.controls { display: flex; gap: 6px; }
.ctl {
  width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  backdrop-filter: blur(8px); font-size: 1.05rem; line-height: 1;
}
.ctl:hover { border-color: var(--accent); color: var(--fg); }
.ctl.wide { width: auto; padding: 0 12px; font-size: 0.82rem; font-weight: 600; }

/* ---------- Intro overlay ---------- */
#intro {
  position: fixed; inset: 0; z-index: 40;
  display: grid; place-items: center; text-align: center; padding: 32px 24px;
  background: transparent;
  pointer-events: none; transition: opacity 0.5s ease;
}
#intro.gone { opacity: 0; }
.intro-content { width: 100%; max-width: 900px; }
#intro h1 {
  margin: 0; color: #fff;
  font-family: 'Pangolin', 'Segoe Script', 'Comic Sans MS', cursive;
  font-size: clamp(2.2rem, min(6.5vw, 9dvh), 5rem);
  font-weight: 400; line-height: 1.08; letter-spacing: -0.015em;
  text-shadow: 0 1px 8px #00000066, 0 0 2px #00000044;
}
#intro h1 span { display: block; }
#intro h1 span:first-child { color: inherit; font-size: 0.82em; }
.intro-context {
  margin: 24px auto clamp(32px, 5dvh, 48px); max-width: 650px;
  color: #fff; font-size: 0.95rem; font-weight: 600; line-height: 1.5;
  letter-spacing: 0.035em; text-transform: uppercase;
  text-shadow: 0 1px 2px #000000e6, 0 0 10px #000000a6;
}
#intro-status { height: 1.5em; margin: 14px 0 0; color: #ffffffb3; font-size: 0.8rem; }
#begin {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-width: 180px; min-height: 56px; padding: 16px 32px;
  border: 1px solid var(--fg); border-radius: 0; background: #fffefb; color: var(--fg);
  font-size: 0.95rem; font-weight: 600; letter-spacing: 0.025em;
  text-transform: uppercase; pointer-events: auto;
  transition: background 0.2s;
}
#begin:hover { background: #f0f0ed; }
#begin:focus-visible { outline: 2px solid var(--fg); outline-offset: 6px; }
#begin:disabled { opacity: 0.6; cursor: wait; }
#begin span[aria-hidden] { color: inherit; font-size: 1.25em; }
.langs {
  position: absolute; left: 0; right: 0;
  bottom: max(24px, env(safe-area-inset-bottom));
  display: flex; gap: 12px; justify-content: center;
}
.langs button {
  border: 0; border-bottom: 1px solid transparent; background: none;
  color: var(--muted); font-size: 0.85rem; font-weight: 600;
  letter-spacing: 0.08em; padding: 8px; pointer-events: auto;
}
.langs button.active { color: var(--fg); border-bottom-color: var(--fg); }

/* ---------- Markers ---------- */
.marker {
  width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid #fff; background: #ffffff66;
  box-shadow: 0 0 0 3px #00000055, 0 0 14px #00000088;
  opacity: 0; transform: scale(0.6);
  transition: opacity 0.5s, transform 0.5s, background 0.2s;
  display: grid; place-items: center;
}
.marker::after {
  content: ''; width: 6px; height: 6px; border-radius: 50%; background: #fff;
}
.marker.on { opacity: 1; transform: scale(1); }
.marker:hover, .marker:focus-visible { background: #fff; outline: none; }
.marker.pulse { animation: pulse 2.4s infinite; }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 3px #00000055, 0 0 0 0 #ffffff88; }
  70%  { box-shadow: 0 0 0 3px #00000055, 0 0 0 16px transparent; }
  100% { box-shadow: 0 0 0 3px #00000055, 0 0 0 0 transparent; }
}
/* markers scale down when zoomed in far */
.osd-marker-anchor { pointer-events: none; }
.osd-marker-anchor .marker { pointer-events: auto; }

/* ---------- Detail panel ---------- */
#panel {
  position: fixed; top: 64px; right: 14px; bottom: 14px; z-index: 30;
  width: min(360px, calc(100vw - 28px));
  background: var(--surface); backdrop-filter: blur(14px);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; overflow-y: auto;
  transform: translateX(calc(100% + 20px));
  transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}
#panel.open { transform: none; }
#panel .p-role {
  color: var(--fg); font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 6px;
}
#panel h2 { margin: 0 0 12px; font-size: 1.5rem; line-height: 1.2; }
#panel .p-bio { color: var(--muted); font-size: 0.95rem; line-height: 1.65; }
#panel audio { width: 100%; margin-top: 14px; }
.panel-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--border);
}
.panel-nav button {
  border: 1px solid var(--border); background: none; color: var(--fg);
  border-radius: 8px; padding: 7px 14px; font-size: 0.85rem;
}
.panel-nav button:hover { border-color: var(--accent); color: var(--fg); }
#close-panel {
  position: absolute; top: 10px; right: 10px;
  border: 0; background: none; color: var(--muted); font-size: 1.3rem; padding: 6px;
}
#close-panel:hover { color: var(--fg); }


/* ---------- Hint toast ---------- */
#hint {
  position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%);
  z-index: 25; background: var(--surface); border: 1px solid var(--border);
  backdrop-filter: blur(8px); border-radius: 999px; padding: 9px 20px;
  font-size: 0.85rem; color: var(--muted); white-space: nowrap;
  opacity: 0; transition: opacity 0.6s; pointer-events: none;
}
#hint.show { opacity: 1; }

/* Portrait screens: Night Watch style — the artwork itself covers the whole
   viewport (centered vertical crop, no paper bars) under the usual scrim. */
@media (max-aspect-ratio: 2480/1467) {
  #overview { background: #1b1d1c; }
  #overview-frame {
    position: fixed;
    /* Artwork is 57.043% of the image height and centered in it, so a frame
       1/0.57043 image-heights tall (x image aspect wide) covers the screen. */
    width: 296.6dvh; height: 175.3dvh;
    left: calc(50% - 148.3dvh); top: calc(50% - 87.65dvh);
    max-width: none; max-height: none;
  }
  #overview-image { width: 100%; height: 100%; max-width: none; max-height: none; }
  #overview-frame::after { background: linear-gradient(#00000066, #00000040 45%, #00000073); }
}

@media (max-width: 640px) {
  #intro { padding: 24px 18px; }
  .intro-context { margin-top: 20px; margin-bottom: 40px; font-size: 0.85rem; }
  #panel { top: auto; left: 8px; right: 8px; bottom: 8px; width: auto; max-height: 46vh;
           transform: translateY(calc(100% + 20px)); }
  .topbar { padding: 8px 10px; }
  .ctl { width: 36px; height: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: 0.01s !important; }
}