:root {
  --paper: #f5f3ee;
  --card: #ffffff;
  --ink: #26251f;
  --ink-soft: #6c6a61;
  --line: #ddd9d0;
  --accent: #1e6b57;
  --accent-ink: #ffffff;
  --other: #eceae3;
  --alert: #b0442a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", "Meiryo", sans-serif;
  font-size: 18px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

.view { display: flex; flex-direction: column; height: 100%; max-width: 780px; margin: 0 auto; }
[hidden] { display: none !important; }

/* --- 共通部品 --- */

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  min-height: 52px;
  padding: 0 20px;
  border: 1px solid transparent;
}
button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 500; }
.primary:hover { filter: brightness(1.08); }

.ghost { background: transparent; color: var(--ink-soft); border-color: transparent; min-height: 44px; padding: 0 12px; }
.ghost:hover { color: var(--ink); }

input, textarea {
  font: inherit;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  min-height: 52px;
}
input:focus, textarea:focus { outline: 3px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

label, .label-like { display: block; margin: 18px 0 6px; font-size: 16px; color: var(--ink-soft); }
.error { color: var(--alert); margin: 12px 0 0; }
.hint { color: var(--ink-soft); font-size: 15px; padding: 16px 20px; margin: 0; }

/* --- ログイン --- */

#view-login { justify-content: center; padding: 24px; }
.login-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 32px 28px; }
.login-card h1 { margin: 0; font-size: 30px; font-weight: 500; letter-spacing: 0.08em; }
.lead { color: var(--ink-soft); margin: 4px 0 20px; font-size: 16px; }
.login-card .primary { width: 100%; margin-top: 28px; }

/* --- ヘッダー --- */

.bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 2;
}
.bar-title { flex: 1; font-size: 19px; font-weight: 500; padding-left: 8px; }

/* --- 部屋一覧 --- */

.room-list { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.room-list li { border-bottom: 1px solid var(--line); }
.room-list button {
  display: flex; align-items: center; gap: 14px;
  width: 100%; text-align: left; background: var(--card);
  border-radius: 0; padding: 18px 20px; min-height: 84px;
}
.room-name { font-weight: 500; }
.room-last { color: var(--ink-soft); font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.room-text { flex: 1; min-width: 0; }
.badge {
  background: var(--alert); color: #fff;
  min-width: 34px; height: 34px; border-radius: 17px;
  display: grid; place-items: center;
  font-size: 16px; font-weight: 500; padding: 0 10px;
}

/* --- 会話 --- */

.messages { flex: 1; overflow-y: auto; padding: 20px 16px 8px; display: flex; flex-direction: column; gap: 16px; }
.msg { max-width: 78%; }
.msg .who { font-size: 14px; color: var(--ink-soft); margin-bottom: 4px; }
.msg .bubble {
  background: var(--other); padding: 12px 16px; border-radius: 12px;
  white-space: pre-wrap; word-break: break-word;
}
.msg .when { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }
.msg.mine { align-self: flex-end; }
.msg.mine .bubble { background: var(--accent); color: var(--accent-ink); }
.msg.mine .when { text-align: right; }
.day { align-self: center; font-size: 14px; color: var(--ink-soft); background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 2px 14px; }

.composer { display: flex; gap: 10px; padding: 12px; background: var(--card); border-top: 1px solid var(--line); align-items: flex-end; }
.composer textarea { resize: none; max-height: 160px; }
.composer .primary { flex-shrink: 0; }

/* --- 管理 --- */

#view-admin { overflow-y: auto; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin: 16px; padding: 20px 22px; }
.panel h2 { margin: 0; font-size: 19px; font-weight: 500; }
.panel .primary { margin-top: 20px; }
.user-list { list-style: none; margin: 12px 0 0; padding: 0; }
.user-list li { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.user-list .u-name { flex: 1; }
.user-list .u-off { color: var(--ink-soft); text-decoration: line-through; }
.user-list input[type=checkbox] { width: 24px; height: 24px; min-height: 24px; flex-shrink: 0; }

@media (max-width: 520px) {
  html, body { font-size: 17px; }
  .msg { max-width: 88%; }
}