:root {
  --ink: #16110d;
  --paper: #efe6d2;
  --paper-dim: rgba(239, 230, 210, 0.72);
  --vermilion: #b0352a;
  --lavender: #b3a9f5;
  --indigo: #2e2a7a;
  --gold: #c9a24b;
  --glass: rgba(20, 14, 10, 0.55);
  --line: rgba(239, 230, 210, 0.16);
  --serif: 'Noto Serif TC', 'Songti TC', serif;
  --calli: 'LXGW WenKai TC', 'Noto Serif TC', serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #0a0806; color: var(--paper); font-family: var(--serif); }
button { font: inherit; color: inherit; }

#stage { position: fixed; inset: 0; }
#stage canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; }
#stage canvas.dragging { cursor: grabbing; }

/* ---------- 開場 ---------- */
#intro {
  position: fixed; inset: 0; z-index: 30; display: grid; place-items: center; color: #2b2540;
  background:
    radial-gradient(ellipse at 50% 115%, rgba(255, 214, 205, 0.95), transparent 55%),
    linear-gradient(180deg, #6f97cf 0%, #a9c1e6 45%, #f2d6d2 100%);
  transition: opacity 1.4s ease, visibility 1.4s;
}
body.entered #intro { opacity: 0; visibility: hidden; }
.intro-inner { text-align: center; padding: 24px; max-width: 520px; }
.logo-ellipse {
  display: inline-grid; place-items: center; width: 92px; height: 40px; flex: none;
  background: var(--lavender); color: var(--indigo); border: 2px solid var(--indigo); border-radius: 50%;
  font: 700 13px var(--calli); letter-spacing: 0.08em; white-space: nowrap;
}
.logo-ellipse.big { width: 168px; height: 72px; margin: 0 auto 30px; font-size: 22px; box-shadow: 0 0 40px rgba(179, 169, 245, 0.25); }
#intro h1 { font: 700 clamp(34px, 9vw, 88px)/1 var(--calli); letter-spacing: 0.14em; white-space: nowrap; margin: 0 0 14px 0.18em; color: #fffaf4; text-shadow: 0 6px 30px rgba(60, 70, 120, 0.35); }
#intro .sub { margin: 0 0 40px; letter-spacing: 0.4em; padding-left: 0.4em; color: rgba(255, 250, 244, 0.85); font-size: 15px; }
#loadbar { width: 220px; height: 2px; margin: 0 auto; background: rgba(255, 255, 255, 0.35); overflow: hidden; }
#loadbar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #8a1d14, #ff9d8a); transition: width 0.4s ease; }
#loadlabel { min-height: 1.4em; margin: 14px 0 28px; font-size: 13px; color: #3b3554; letter-spacing: 0.2em; }
#enter {
  padding: 14px 52px; border: 0; background: #8a1d14; color: #fff3ec; box-shadow: 0 10px 30px rgba(138, 29, 20, 0.35);
  font: 600 18px var(--serif); letter-spacing: 0.3em; cursor: pointer; transition: all 0.3s; opacity: 0; transform: translateY(6px);
}
body.ready #enter { opacity: 1; transform: none; }
#enter:hover { background: #a3271c; }
#enter:disabled { cursor: default; }
.tip { margin-top: 28px; font-size: 12px; color: rgba(43, 37, 64, 0.55); }

/* ---------- 介面 ---------- */
#brand, #tools, #hint, #admin-link { opacity: 0; transition: opacity 1.2s 1s; }
body.entered #brand, body.entered #tools, body.entered #hint, body.entered #admin-link { opacity: 1; }

#brand {
  position: fixed; top: 20px; left: 20px; z-index: 10; display: flex; align-items: center; gap: 12px; pointer-events: none;
}
#brand strong { display: block; font: 700 22px var(--calli); letter-spacing: 0.12em; color: #fff; text-shadow: 0 1px 2px rgba(30, 30, 60, 0.6), 0 2px 14px rgba(30, 30, 60, 0.45); }
#brand small { display: block; font-size: 11px; letter-spacing: 0.3em; color: #fff; text-shadow: 0 1px 6px rgba(30, 30, 60, 0.7); }

#tools { position: fixed; top: 20px; right: 20px; z-index: 10; display: flex; gap: 8px; }
#tools button, #tools a {
  padding: 8px 14px; font-size: 13px; letter-spacing: 0.1em; cursor: pointer;
  background: var(--glass); border: 1px solid var(--line); border-radius: 999px; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: background 0.2s, border-color 0.2s;
}
#tools a { color: var(--paper); text-decoration: none; display: inline-flex; align-items: center; }
#tools a[hidden] { display: none; }
#tools button:hover, #tools a:hover { background: rgba(176, 53, 42, 0.5); border-color: rgba(201, 162, 75, 0.6); }

#hint {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 10; display: flex; gap: 18px;
  padding: 10px 20px; font-size: 12px; color: var(--paper-dim); background: var(--glass); border: 1px solid var(--line);
  border-radius: 999px; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); white-space: nowrap; pointer-events: none;
}
#hint b { color: var(--paper); font-weight: 600; margin-right: 4px; }
body.entered #hint.hide { opacity: 0; transition-delay: 0s; }

#admin-link { position: fixed; right: 18px; bottom: 18px; z-index: 10; font-size: 11px; color: rgba(239, 230, 210, 0.35); text-decoration: none; letter-spacing: 0.2em; }
#admin-link:hover { color: var(--paper); }

#tooltip {
  position: fixed; left: 0; top: 0; z-index: 12; padding: 6px 12px; font-size: 13px; pointer-events: none;
  background: rgba(239, 230, 210, 0.92); color: var(--ink); border-left: 3px solid var(--vermilion);
  opacity: 0; transition: opacity 0.15s;
}
#tooltip.show { opacity: 1; }
#tooltip small { display: block; font-size: 11px; color: #6b5a48; }

/* ---------- 作品資訊 ---------- */
#panel {
  position: fixed; top: 50%; right: 28px; z-index: 15; width: min(360px, calc(100vw - 32px)); max-height: calc(100vh - 140px); overflow: auto;
  padding: 30px 30px 24px; color: var(--ink);
  background:
    linear-gradient(rgba(239, 230, 210, 0.96), rgba(232, 221, 196, 0.96));
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
  border-top: 4px solid var(--vermilion);
  transform: translate(30px, -50%); opacity: 0; visibility: hidden; transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
#panel.open { transform: translate(0, -50%); opacity: 1; visibility: visible; }
#p-close { position: absolute; top: 10px; right: 12px; border: 0; background: none; font-size: 26px; line-height: 1; cursor: pointer; color: #6b5a48; }
#p-index { margin: 0 0 10px; font-size: 11px; letter-spacing: 0.3em; color: var(--vermilion); }
#p-title { margin: 0 0 8px; font: 700 28px/1.3 var(--calli); letter-spacing: 0.06em; }
#p-meta { margin: 0; font-size: 15px; color: #4a3d30; }
#p-medium { margin: 4px 0 0; font-size: 13px; color: #7a6a58; }
#p-medium:empty { display: none; }
.rule { height: 1px; margin: 18px 0; background: linear-gradient(90deg, var(--vermilion), rgba(176, 53, 42, 0)); }
#p-desc { margin: 0; font-size: 14px; line-height: 1.9; white-space: pre-wrap; color: #2e251d; }
.placeholder-note { display: none; margin: 14px 0 0; padding: 6px 10px; font-size: 12px; background: rgba(176, 53, 42, 0.1); color: var(--vermilion); }
#panel.is-placeholder .placeholder-note { display: inline-block; }
.p-nav { display: flex; justify-content: space-between; margin-top: 24px; }
.p-nav button { padding: 8px 14px; border: 1px solid rgba(22, 17, 13, 0.25); background: transparent; color: var(--ink); cursor: pointer; font-size: 13px; letter-spacing: 0.1em; }
.p-nav button:hover { background: var(--ink); color: var(--paper); }

.ripple {
  position: fixed; z-index: 11; width: 40px; height: 40px; margin: -20px 0 0 -20px; border-radius: 50%;
  border: 2px solid rgba(239, 230, 210, 0.8); pointer-events: none; animation: ripple 0.7s ease-out forwards;
}
@keyframes ripple { from { transform: scale(0.3); opacity: 1; } to { transform: scale(1.6); opacity: 0; } }

@media (max-width: 720px) {
  #brand { top: 14px; left: 14px; }
  #brand strong { font-size: 18px; }
  #brand .logo-ellipse { display: none; }
  #tools { flex-wrap: nowrap; }
  #tools button, #tools a { padding: 7px 11px; font-size: 12px; }
  #tools { top: auto; bottom: 16px; right: 50%; transform: translateX(50%); }
  #hint { bottom: 64px; gap: 10px; font-size: 11px; padding: 8px 14px; }
  #hint span:nth-child(2) { display: none; }
  #admin-link { top: 22px; bottom: auto; right: 16px; }
  #panel {
    top: auto; bottom: 0; right: 0; left: 0; width: 100%; max-height: 52vh; padding: 22px 20px 20px;
    transform: translateY(30px); border-radius: 14px 14px 0 0;
  }
  #panel.open { transform: none; }
  #p-title { font-size: 22px; }
}