:root {
  --bg: #f4f5f3;
  --panel: #ffffff;
  --line: #dfe2dd;
  --text: #1c211d;
  --muted: #667068;
  --accent: #0f7a52;
  --accent-text: #ffffff;
  --bubble-in: #ffffff;
  --bubble-out: #dcf3e4;
  --danger: #c92a2a;
  --hover: #eef1ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141815;
    --panel: #1d221e;
    --line: #313832;
    --text: #e8ece8;
    --muted: #9aa59c;
    --accent: #35b07f;
    --accent-text: #08130d;
    --bubble-in: #262c27;
    --bubble-out: #1d4a36;
    --danger: #ff8787;
    --hover: #262c27;
  }
}

* { box-sizing: border-box; }
html, body, #app { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
button, input, select, textarea { font: inherit; color: inherit; }
button {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
}
button:hover { background: var(--hover); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.primary:hover { filter: brightness(1.08); background: var(--accent); }
button.danger { color: var(--danger); }
button:disabled { opacity: .5; cursor: default; }
input[type="text"], input[type="email"], input[type="password"], input[type="search"], select, textarea {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  width: 100%;
}
input[type="color"] { width: 34px; height: 34px; padding: 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); flex: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
[hidden] { display: none !important; }
.pad { padding: 0 16px; }
.mt { margin-top: 18px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--danger); min-height: 1.4em; margin: 6px 0 0; }

/* Anmeldung */
.login { max-width: 380px; margin: 10vh auto; padding: 28px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.login h1 { font-size: 22px; margin: 0 0 4px; }
.login label { display: block; margin-top: 14px; font-size: 13px; color: var(--muted); }
.login button { width: 100%; margin-top: 18px; padding: 10px; }
.login .demo-users button { margin-top: 10px; }

/* Grundaufbau */
.shell { display: grid; grid-template-rows: auto 1fr; height: 100%; }
.topbar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.topbar h1 { font-size: 17px; margin: 0; margin-right: auto; white-space: nowrap; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.columns { display: grid; grid-template-columns: 330px minmax(0, 1fr) 270px; min-height: 0; }
.columns > * { min-height: 0; }

/* Chatliste */
.list { display: flex; flex-direction: column; background: var(--panel); border-right: 1px solid var(--line); }
.filters { padding: 12px; display: grid; gap: 8px; border-bottom: 1px solid var(--line); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button { padding: 3px 10px; border-radius: 99px; font-size: 13px; }
.chips button.on { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.filter-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.items { overflow-y: auto; flex: 1; }
.item { display: block; width: 100%; text-align: left; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; padding: 11px 14px; background: transparent; }
.item.on { background: var(--hover); }
.item .row { display: flex; align-items: baseline; gap: 8px; }
.item .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-right: auto; }
span.row, span.preview, span.tags { display: flex; }
.item .preview { display: block; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin: 2px 0 6px; }
.unread { background: var(--accent); color: var(--accent-text); border-radius: 99px; font-size: 12px; font-weight: 700; padding: 0 7px; }
.tags { display: flex; flex-wrap: wrap; gap: 5px; }
.tag { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; padding: 1px 8px; border: 1px solid var(--line); border-radius: 99px; white-space: nowrap; }
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.tag.status { font-weight: 600; }
.empty { padding: 30px 16px; text-align: center; color: var(--muted); }

/* Verlauf */
.thread { display: flex; flex-direction: column; }
.thread-head { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.thread-head .who { margin-right: auto; min-width: 0; }
.thread-head .who strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.back, .toggle-details { display: none; }
.messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: min(560px, 80%); padding: 8px 11px; border-radius: 12px; background: var(--bubble-in); border: 1px solid var(--line); white-space: pre-wrap; overflow-wrap: anywhere; align-self: flex-start; }
.msg.out { background: var(--bubble-out); align-self: flex-end; }
.msg .att-img { display: block; max-width: 100%; max-height: 320px; border-radius: 8px; margin-bottom: 6px; }
.msg .att-media { display: block; max-width: 100%; margin-bottom: 6px; }
.msg .att-doc { display: inline-block; padding: 6px 10px; margin-bottom: 6px; border: 1px solid var(--line); border-radius: 8px; color: inherit; text-decoration: none; }
.msg .att-doc:hover { border-color: var(--muted); }
.msg .meta { display: block; font-size: 11.5px; color: var(--muted); margin-top: 3px; text-align: right; }
.day { align-self: center; font-size: 12px; color: var(--muted); padding: 4px 0; }
.composer { display: flex; gap: 8px; padding: 12px 16px; background: var(--panel); border-top: 1px solid var(--line); align-items: flex-end; }
.composer textarea { resize: none; min-height: 40px; max-height: 160px; }
.notice { margin: 0; padding: 10px 16px; background: var(--panel); border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.notice.warn { color: var(--danger); }

/* Details */
.details { background: var(--panel); border-left: 1px solid var(--line); padding: 16px; overflow-y: auto; }
.details h2, dialog h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 18px 0 8px; }
.details h2:first-child { margin-top: 0; }
.check { display: flex; align-items: center; gap: 8px; padding: 4px 0; cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }

/* Einstellungen */
dialog { width: min(640px, calc(100vw - 24px)); max-height: calc(100vh - 40px); border: 1px solid var(--line); border-radius: 14px; background: var(--panel); color: var(--text); padding: 20px 22px; }
dialog::backdrop { background: rgba(0, 0, 0, .45); }
dialog header { display: flex; align-items: center; }
dialog header h1 { font-size: 19px; margin: 0 auto 0 0; }
.set-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.set-row .grow { flex: 1; min-width: 0; }
.set-row button { flex: none; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 8px; }

@media (max-width: 1050px) {
  .columns { grid-template-columns: 300px minmax(0, 1fr); }
  .details { display: none; position: fixed; inset: 0 0 0 auto; width: min(300px, 100vw); z-index: 5; box-shadow: -8px 0 24px rgba(0, 0, 0, .2); }
  .details-open .details { display: block; }
  .toggle-details { display: inline-block; }
}
@media (max-width: 720px) {
  .columns { grid-template-columns: minmax(0, 1fr); }
  .thread { display: none; }
  .chat-open .thread { display: flex; }
  .chat-open .list { display: none; }
  .back { display: inline-block; }
  .topbar { flex-wrap: wrap; padding: 8px 12px; }
  .topbar .user-name { display: none; }
  .form-grid { grid-template-columns: 1fr; }
}