/* Message Hub — simple, clean, dark-friendly. No information by color alone. */
:root {
  --bg: #141a22; --panel: #1b2430; --text: #e8edf3; --muted: #9aa7b8;
  --accent: #7fb3ff; --border: #2c3a4d; --sys: #3a2f16;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 1.05rem/1.5 system-ui, sans-serif;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip {
  position: absolute; left: -9999px; top: 0; background: var(--accent);
  color: #000; padding: .5rem 1rem; z-index: 99;
}
.skip:focus { left: 0; }
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: .6rem 1rem; background: var(--panel); border-bottom: 2px solid var(--border);
}
header h1 { font-size: 1.3rem; margin: 0; }
.header-actions { display: flex; gap: .6rem; align-items: center; }
.layout { display: flex; min-height: calc(100vh - 3.5rem); }
nav {
  width: 16rem; flex-shrink: 0; background: var(--panel);
  border-right: 2px solid var(--border); padding: .8rem;
}
nav ul { list-style: none; margin: 0; padding: 0; }
nav button {
  display: block; width: 100%; text-align: left; margin: .25rem 0;
  background: none; border: 2px solid transparent; color: var(--text);
  font-size: 1.05rem; padding: .6rem .7rem; border-radius: .4rem; cursor: pointer;
}
nav button:hover, nav button:focus-visible { border-color: var(--accent); outline: none; }
nav button[aria-current="page"] { border-color: var(--accent); background: #223046; }
.key {
  display: inline-block; min-width: 1.4em; text-align: center; font-weight: bold;
  border: 1px solid var(--border); border-radius: .25em; margin-right: .4em;
  background: #0f141b;
}
main { flex: 1; padding: 1rem 1.4rem; max-width: 60rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; margin-top: 1.4rem; }
.hint { color: var(--muted); font-size: .95rem; }
.note { color: var(--muted); font-style: italic; }
label { display: block; margin-top: .8rem; font-weight: bold; }
input, textarea {
  display: block; width: 100%; max-width: 34rem; margin-top: .25rem;
  background: #0f141b; color: var(--text); border: 2px solid var(--border);
  border-radius: .4rem; padding: .55rem .7rem; font-size: 1.05rem;
}
input:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 3px solid var(--accent); outline-offset: 2px;
}
button {
  background: #223046; color: var(--text); border: 2px solid var(--border);
  border-radius: .4rem; padding: .55rem 1rem; font-size: 1.02rem; cursor: pointer;
  margin-top: .7rem;
}
button:hover { border-color: var(--accent); }
.item-list { list-style: none; margin: 0; padding: 0; }
.item-list > li {
  border: 2px solid var(--border); border-radius: .5rem; padding: .7rem .9rem;
  margin: .5rem 0; background: var(--panel);
}
.item-list button { margin: 0; background: none; border: none; padding: 0;
  font-size: 1.05rem; text-align: left; width: 100%; }
.item-list .meta { color: var(--muted); font-size: .92rem; display: block; }
.msg { margin: .5rem 0; }
.msg .who { font-weight: bold; }
.msg .time { color: var(--muted); font-size: .85rem; }
.msg.system-msg {
  border-left: 4px solid #d8a93c; padding-left: .7rem;
  background: var(--sys); border-radius: .25rem;
}
.msg .sys-tag {
  font-size: .8rem; font-weight: bold; text-transform: uppercase;
  letter-spacing: .06em; color: #d8a93c; margin-right: .5em;
}
#messages {
  border: 2px solid var(--border); border-radius: .5rem; padding: .8rem;
  max-height: 50vh; overflow-y: auto; background: #10151c; margin: .8rem 0;
}
#compose-form { display: flex; gap: .6rem; align-items: flex-end; }
#compose-form textarea { flex: 1; }
kbd {
  border: 1px solid var(--border); border-radius: .25em; padding: 0 .4em;
  background: #0f141b; font-family: inherit;
}
dialog {
  background: var(--panel); color: var(--text); border: 2px solid var(--border);
  border-radius: .6rem; padding: 1.2rem 1.6rem; max-width: 32rem;
}
dialog::backdrop { background: rgba(0,0,0,.6); }
dialog dt { font-weight: bold; margin-top: .5rem; }
dialog dd { margin: .1rem 0 .4rem 0; color: var(--muted); }
@media (max-width: 48rem) {
  .layout { flex-direction: column; }
  nav { width: auto; border-right: none; border-bottom: 2px solid var(--border); }
}
.linklike {
  background: none; border: none; padding: 0; margin: 0;
  color: var(--accent, #7cc4ff); text-decoration: underline; cursor: pointer;
  font: inherit;
}
.linklike:hover, .linklike:focus { color: #a8d8ff; }