:root {
  --bg: #fafaf9; --fg: #1c1917; --muted: #78716c; --line: #e7e5e4; --field: #ffffff;
  --wall: #f5f5f4; --dot: #d6d3d1;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09; --fg: #f5f5f4; --muted: #a8a29e; --line: #292524; --field: #1c1917;
    --wall: #171412; --dot: #33302d;
  }
}
* { box-sizing: border-box; margin: 0; }
body {
  background: var(--bg); color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  padding: 32px 0 40px; -webkit-font-smoothing: antialiased;
}
header { text-align: center; margin-bottom: 20px; padding: 0 16px; }
.back { color: var(--muted); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--fg); }
h1 { font-size: 28px; font-weight: 650; letter-spacing: -0.02em; margin-top: 12px; }
.sub { color: var(--muted); margin-top: 4px; font-size: 15px; }

/* 벽: 고정 크기, 화면보다 크면 스크롤로 둘러본다 (크기는 app.js WALL_W/WALL_H와 같게) */
.viewport {
  max-width: min(1640px, 100%); margin: 0 auto; height: min(76vh, 1020px);
  overflow: auto; overscroll-behavior: contain;
  border-block: 1px solid var(--line);
}
@media (min-width: 1640px) { .viewport { border: 1px solid var(--line); border-radius: 16px; } }
.wall {
  position: relative; width: 1600px; height: 1000px; margin: 10px;
  background-color: var(--wall);
  background-image: radial-gradient(var(--dot) 1.2px, transparent 1.2px);
  background-size: 24px 24px; border-radius: 12px;
  cursor: text;
}
.empty {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  color: var(--muted); white-space: nowrap; pointer-events: none;
}

/* 벽에 적힌 글씨 */
.text {
  position: absolute; max-width: 260px;
  font-size: 17px; line-height: 1.45; font-weight: 500;
  white-space: pre-wrap; word-break: break-word;
  cursor: pointer; padding: 2px 4px; border-radius: 6px;
}
.text:hover, .text.on { background: color-mix(in srgb, var(--fg) 8%, transparent); }
.text.mine { opacity: .45; }

/* 이름표 */
.tag {
  position: absolute; z-index: 20; pointer-events: none;
  background: var(--fg); color: var(--bg); font-size: 13px; font-weight: 600;
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
.tag .date { font-weight: 400; opacity: .7; margin-left: 6px; }

/* 누른 자리에 뜨는 입력 칸 */
.editor { position: absolute; z-index: 30; width: 260px; cursor: auto; }
.editor[hidden] { display: none; }
.editor textarea {
  display: block; width: 100%; resize: none; overflow: hidden;
  font: inherit; font-size: 17px; line-height: 1.45; font-weight: 500; color: var(--fg);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border: 1.5px dashed var(--fg); border-radius: 8px; padding: 4px 6px;
}
.editor textarea:focus { outline: none; }
.panel {
  margin-top: 8px; display: flex; gap: 6px; align-items: center;
  background: var(--field); border: 1px solid var(--line); border-radius: 14px; padding: 6px;
  box-shadow: 0 6px 20px rgba(0,0,0,.12);
}
.panel input {
  flex: 1; min-width: 0; font: inherit; font-size: 15px; color: inherit; background: transparent;
  border: 0; padding: 6px 8px;
}
.panel input:focus { outline: none; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

button {
  font: inherit; font-size: 14px; font-weight: 600; padding: 7px 12px; border-radius: 10px; border: 0;
  background: var(--fg); color: var(--bg); cursor: pointer; flex: none;
}
button:disabled { opacity: .5; cursor: default; }
.ghost-btn { background: transparent; color: var(--muted); }

.toast {
  position: fixed; left: 50%; top: 20px; transform: translateX(-50%); z-index: 40;
  background: var(--fg); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: 14px;
  max-width: calc(100vw - 32px); text-align: center;
}
.toast.err { background: #dc2626; color: #fff; }