/* ============================================================================
   神秘复苏 · 频道  样式表
   纯手写 CSS，无构建步骤，无外部字体/图标依赖。
   主题变量集中在 :root；每个频道会把 --accent 换成自己的色。
   ========================================================================= */

:root {
  --bg: #07090c;
  --bg-elev: #0d1117;
  --bg-elev-2: #11161d;
  --bg-sunk: #05070a;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text: #c9d1d9;
  --text-dim: #8b949e;
  /*
    次要文字（频道旁白、时间戳、面板小标题）。
    这个值是按 WCAG AA 反推的：在 --bg / --bg-elev / --bg-elev-2 三种底色上
    对比度都不低于 4.5:1。原来的 #5b646e 只有 3.32:1，而"XX 进入了频道"
    这类旁白是内容不是装饰，读不清就是缺陷。
  */
  --text-faint: #78818d;

  --accent: #7dd3fc;
  --danger: #f87171;
  --warn: #fbbf24;
  --ok: #86efac;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.55);

  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --topbar-h: 56px;
}

* { box-sizing: border-box; }

/*
  hidden 属性必须真的管用。
  HTML 里 .modal / .gate / .app 都写了 display:grid|flex，那是**作者样式**，
  而 [hidden]{display:none} 来自浏览器 UA 样式表，优先级永远低于作者样式——
  结果就是 hidden 形同虚设，入场页、主界面、守则弹窗会全部叠在一起。
  这一条必须放在所有布局规则之前生效，所以用 !important 兜底。
*/
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* 极淡的扫描线，营造"信号不稳定"的氛围；不影响阅读 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.014) 0 1px,
    transparent 1px 3px
  );
  mix-blend-mode: overlay;
}

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--text-dim); }
.small { font-size: 12.5px; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); background-clip: content-box; }

/* ─────────────────────────────── 通用控件 ─────────────────────────────── */

.btn {
  font: inherit;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg-elev-2);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn:hover { background: #1a2230; border-color: rgba(255, 255, 255, 0.28); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn--primary {
  background: color-mix(in srgb, var(--accent) 18%, var(--bg-elev-2));
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  color: #eaf6ff;
  font-weight: 600;
}
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 30%, var(--bg-elev-2)); }

.btn--ghost { background: transparent; }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.06); }
.btn--sm { padding: 5px 10px; font-size: 13px; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

.icon-btn {
  font: inherit;
  font-size: 18px;
  line-height: 1;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.07); color: var(--text); }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex: none; }
.dot--off { background: var(--text-faint); }
.dot--on { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.dot--wait { background: var(--warn); animation: pulse 1.2s infinite; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.pill {
  font-size: 12.5px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  white-space: nowrap;
}

/* ─────────────────────────────── 入场遮罩 ─────────────────────────────── */

.gate {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(125, 211, 252, 0.07), transparent 60%),
    var(--bg);
  overflow-y: auto;
}

.gate__card {
  width: min(460px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 24px 22px;
  box-shadow: var(--shadow);
}

.gate__brand { display: flex; gap: 14px; align-items: center; margin-bottom: 14px; }
.gate__sigil {
  font-size: 26px;
  color: var(--accent);
  text-shadow: 0 0 18px color-mix(in srgb, var(--accent) 70%, transparent);
}
.gate__brand h1 { font-size: 19px; margin: 0; letter-spacing: 0.02em; }
.gate__sub { margin: 2px 0 0; font-size: 13px; color: var(--text-dim); }

.gate__intro { font-size: 13.5px; color: var(--text-dim); margin: 0 0 18px; }
.gate__form { display: grid; gap: 14px; }

.field { display: grid; gap: 6px; }
.field__label { font-size: 13px; color: var(--text-dim); }
.field input,
.field select {
  font: inherit;
  font-size: 14.5px;
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg-sunk);
  color: var(--text);
  width: 100%;
}
.field input:focus,
.field select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }

.gate__error {
  margin: 0;
  font-size: 13px;
  color: var(--danger);
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}

.gate__foot { font-size: 12px; color: var(--text-faint); margin: 16px 0 0; }

/* ─────────────────────────────── 主框架 ─────────────────────────────── */

.app { height: 100%; display: flex; flex-direction: column; }

.topbar {
  height: var(--topbar-h);
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-elev);
}
.topbar__menu, .topbar__panel { display: none; }
.topbar__brand { display: flex; align-items: center; gap: 8px; min-width: 0; }
.topbar__sigil { color: var(--accent); font-size: 17px; }
.topbar__title {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__clock {
  margin-left: auto;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-sunk);
}
.clock__label { font-size: 11.5px; color: var(--text-faint); }
.clock__value { font-size: 15px; color: var(--accent); letter-spacing: 0.04em; }
.clock__meta { font-size: 11.5px; color: var(--text-faint); }

.topbar__status { display: flex; align-items: center; gap: 7px; }
.topbar__conn { font-size: 12.5px; color: var(--text-dim); white-space: nowrap; }

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr) 336px;
}

/* ─────────────────────────────── 侧栏：频道 ─────────────────────────────── */

.sidebar {
  min-height: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--bg-elev);
}
.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px 8px;
}
.sidebar__head h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-faint); margin: 0; }
.sidebar__close { display: none; }

.rooms { list-style: none; margin: 0; padding: 0 8px; overflow-y: auto; flex: 1; }

.room {
  width: 100%;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 9px;
  align-items: center;
  text-align: left;
  font: inherit;
  padding: 9px 10px;
  margin-bottom: 2px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}
.room:hover { background: rgba(255, 255, 255, 0.045); color: var(--text); }
.room.is-active {
  background: color-mix(in srgb, var(--room-accent, var(--accent)) 12%, transparent);
  border-color: color-mix(in srgb, var(--room-accent, var(--accent)) 38%, transparent);
  color: #eaf6ff;
}
.room__icon { color: var(--room-accent, var(--accent)); font-size: 15px; text-align: center; }
.room__name { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.room__sub { font-size: 11.5px; color: var(--text-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.room__badge {
  grid-column: 2;
  font-size: 10.5px;
  color: var(--warn);
  letter-spacing: 0.04em;
}

.sidebar__foot { flex: none; border-top: 1px solid var(--line); padding: 12px; }
.sidebar__me { margin-bottom: 10px; }
.me__nick { font-size: 14px; font-weight: 600; }
.me__meta { font-size: 12px; color: var(--text-dim); }

/* ─────────────────────────────── 聊天区 ─────────────────────────────── */

.chat { min-height: 0; display: flex; flex-direction: column; background: var(--bg); }

.chat__head {
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
}
.chat__title { display: flex; align-items: center; gap: 11px; min-width: 0; }
.chat__icon { font-size: 20px; color: var(--accent); }
.chat__title h2 { font-size: 16px; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat__sub { margin: 0; font-size: 12.5px; color: var(--text-dim); }
.chat__meta { margin-left: auto; display: flex; align-items: center; gap: 8px; }

.chat__desc {
  flex: none;
  padding: 10px 18px;
  font-size: 13px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 5%, transparent), transparent);
}
.chat__desc:empty { display: none; }

.messages {
  list-style: none;
  margin: 0;
  padding: 14px 18px 6px;
  overflow-y: auto;
  flex: 1;
  scroll-behavior: smooth;
  overscroll-behavior: contain;
}

.msg { margin-bottom: 12px; animation: fadein 0.18s ease-out; }
@keyframes fadein { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }

.msg__head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 3px; flex-wrap: wrap; }
.msg__nick { font-size: 13.5px; font-weight: 600; color: var(--accent); }
.msg__nick.is-self { color: var(--ok); }
.msg__title {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
}
.msg__time { font-size: 11px; color: var(--text-faint); font-family: var(--mono); }

.msg__body { white-space: pre-wrap; overflow-wrap: anywhere; }
.msg__body em { color: color-mix(in srgb, var(--accent) 85%, white); font-style: italic; }

.msg--action .msg__body { font-style: italic; color: color-mix(in srgb, var(--accent) 70%, var(--text)); }
.msg--ooc .msg__body { font-family: var(--mono); font-size: 13px; color: var(--text-faint); }
.msg--self { padding-left: 10px; border-left: 2px solid color-mix(in srgb, var(--ok) 45%, transparent); }

.msg__mod {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 4px;
  font-size: 11.5px;
  color: var(--warn);
  border: 1px dashed rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.06);
  border-radius: var(--radius-sm);
  padding: 2px 7px;
}
.msg__masked { color: var(--warn); background: rgba(251, 191, 36, 0.12); border-radius: 3px; padding: 0 2px; }

/* 系统 / 旁白 */
.msg--system, .msg--join, .msg--leave {
  text-align: center;
  font-size: 12.5px;
  color: var(--text-faint);
  padding: 4px 0;
  border-top: 1px solid transparent;
}
.msg--system .msg__body { display: inline-block; }
.msg--system .msg__body::before { content: "— "; opacity: 0.5; }
.msg--system .msg__body::after { content: " —"; opacity: 0.5; }

/* 事件卡 / 结算卡（消息流内） */
.msg--event, .msg--reveal, .msg--clue { margin: 18px 0; }
.inline-card {
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.inline-card--reveal { border-left-color: var(--danger); }
.inline-card--clue { border-left-color: var(--warn); }
.inline-card__kicker {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: block;
  margin-bottom: 6px;
}
.inline-card__title { font-size: 16px; margin: 0 0 6px; }
.inline-card__body { font-size: 14px; color: var(--text); margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.inline-card__meta { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.grade {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid currentColor;
  white-space: nowrap;
}

/* ── 结案报告：档案式统计栏与真相认定 ───────────────────────────── */

.report-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 14px 0 12px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.report-stat {
  background: var(--bg-sunk);
  padding: 9px 6px;
  text-align: center;
}
.report-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: 19px;
  line-height: 1.2;
  color: var(--text);
}
.report-stat__label {
  display: block;
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 2px;
}

.report-truth {
  border-left: 2px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 9px 12px;
  margin: 12px 0 10px;
}
.report-truth__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 4px;
}
.report-truth p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
}

/* 打字中 */
.typing {
  flex: none;
  padding: 4px 20px 0;
  font-size: 12px;
  color: var(--text-faint);
  min-height: 20px;
}

/* ─────────────────────────────── 输入区 ─────────────────────────────── */

.composer {
  flex: none;
  border-top: 1px solid var(--line);
  padding: 10px 18px 14px;
  background: var(--bg-elev);
}
.composer__row { display: flex; gap: 10px; align-items: flex-end; }
.composer textarea {
  font: inherit;
  font-size: 14.5px;
  flex: 1;
  resize: none;
  max-height: 140px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg-sunk);
  color: var(--text);
  line-height: 1.55;
}
.composer textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent); }
.composer textarea::placeholder { color: var(--text-faint); }

.composer__tools { display: flex; align-items: center; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.chip {
  font: inherit;
  font-size: 12px;
  font-family: var(--mono);
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}
.chip:hover { color: var(--text); border-color: var(--line-strong); background: rgba(255, 255, 255, 0.05); }
.composer__count { margin-left: auto; font-size: 11.5px; color: var(--text-faint); font-family: var(--mono); }

.preview {
  font-size: 12.5px;
  margin-bottom: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(251, 191, 36, 0.4);
  background: rgba(251, 191, 36, 0.06);
  color: var(--warn);
  overflow-wrap: anywhere;
}
.preview b { color: var(--text); font-weight: 500; }
.preview .masked { background: rgba(251, 191, 36, 0.18); border-radius: 3px; padding: 0 2px; }

/* ─────────────────────────────── 右侧事件面板 ─────────────────────────────── */

.panel {
  min-height: 0;
  overflow-y: auto;
  padding: 14px;
  border-left: 1px solid var(--line);
  background: var(--bg-elev);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev-2);
  padding: 14px;
}
.card--event { border-color: color-mix(in srgb, var(--accent) 28%, var(--line)); }

.card__head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.card__kicker { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); }
.card__title { font-size: 17px; margin: 0 0 3px; line-height: 1.35; }
.card__code {
  font-size: 11.5px;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin: 0 0 4px;
}
.card__code:empty { display: none; }
.card__loc { font-size: 12.5px; color: var(--text-dim); margin: 0 0 9px; font-family: var(--mono); }
.card__summary { font-size: 13.5px; color: var(--text-dim); margin: 0 0 10px; white-space: pre-wrap; }
.card__section { margin-top: 13px; }
.card__section h4 { font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); margin: 0 0 7px; font-weight: 600; }
.card__foot { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }

.rules { list-style: none; margin: 0; padding: 0; counter-reset: r; }
.rules li {
  counter-increment: r;
  position: relative;
  padding-left: 24px;
  font-size: 13px;
  margin-bottom: 7px;
  color: var(--text);
}
.rules li::before {
  content: counter(r);
  position: absolute;
  left: 0;
  top: 1px;
  width: 17px;
  height: 17px;
  display: grid;
  place-items: center;
  font-size: 10.5px;
  font-family: var(--mono);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 4px;
}

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
}

.clues { list-style: none; margin: 0; padding: 0; }
.clues li {
  font-size: 13px;
  padding: 7px 10px;
  margin-bottom: 6px;
  border-left: 2px solid var(--warn);
  background: rgba(251, 191, 36, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.clues li.is-locked { border-left-color: var(--line-strong); background: transparent; color: var(--text-faint); }

.countdown { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.countdown__label { font-size: 12px; color: var(--text-dim); }
.countdown__value { font-size: 20px; color: var(--accent); letter-spacing: 0.05em; }
.countdown__value.is-close { color: var(--warn); }
.countdown__value.is-done { color: var(--ok); }

.stat-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.stat {
  flex: 1 1 68px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 7px 9px;
  text-align: center;
}
.stat__num { font-size: 18px; font-family: var(--mono); display: block; }
.stat__label { font-size: 11px; color: var(--text-faint); }

.roster, .online { list-style: none; margin: 0; padding: 0; }
.roster li, .online li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  padding: 5px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.roster li:last-child, .online li:last-child { border-bottom: none; }
.roster__name, .online__name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.roster__tag { margin-left: auto; font-size: 11px; color: var(--text-faint); white-space: nowrap; }
.roster li.is-dead .roster__name { color: var(--text-faint); text-decoration: line-through; }
.roster li.is-mvp .roster__name { color: var(--warn); }

/* ─────────────────────────────── 弹窗 / 抽屉 ─────────────────────────────── */

.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.66);
  backdrop-filter: blur(3px);
}
.modal__card {
  width: min(520px, 100%);
  max-height: 80vh;
  overflow-y: auto;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.modal__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.modal__head h3 { margin: 0; font-size: 17px; }
.modal__foot { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(2px);
}

/* ─────────────────────────────── 响应式 ─────────────────────────────── */

@media (max-width: 1180px) {
  .layout { grid-template-columns: 210px minmax(0, 1fr); }
  .topbar__panel { display: grid; }
  .panel {
    position: fixed;
    top: var(--topbar-h);
    right: 0;
    bottom: 0;
    width: min(360px, 88vw);
    z-index: 95;
    transform: translateX(102%);
    transition: transform 0.22s ease;
    border-left: 1px solid var(--line-strong);
    box-shadow: var(--shadow);
  }
  .panel.is-open { transform: none; }
}

@media (max-width: 820px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .topbar__menu { display: grid; }
  .topbar__title { display: none; }
  .topbar__clock { padding: 3px 10px; }
  .clock__label, .clock__meta { display: none; }

  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    width: min(280px, 84vw);
    z-index: 95;
    transform: translateX(-102%);
    transition: transform 0.22s ease;
    border-right: 1px solid var(--line-strong);
    box-shadow: var(--shadow);
  }
  .sidebar.is-open { transform: none; }
  .sidebar__close { display: grid; }

  .messages { padding: 12px 12px 4px; }
  .chat__head { padding: 10px 12px; }
  .chat__desc { padding: 8px 12px; }
  .composer { padding: 9px 12px 12px; }
  .composer__count { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .messages { scroll-behavior: auto; }
  body::after { display: none; }
}