:root, [data-theme="dark"] {
  --bg: #121814;
  --panel: #1b241e;
  --panel-2: #152019;
  --line: #2c382f;
  --text: #e7eee8;
  --muted: #93a197;
  --accent: #c4b28a;
  --accent-text: #1a1810;
  --danger: #c47a6a;
  --hover: #243028;
  --bubble-me: #2a3a30;
  --bubble-other: #1e2822;
  --unread: #c4b28a;
  --radius: 10px;
  --font: "Iowan Old Style", "Palatino Linotype", "Noto Serif TC", serif;
  --font-ui: "Source Sans 3", "Noto Sans TC", "Segoe UI", sans-serif;
}

[data-theme="light"] {
  --bg: #f3f0e8;
  --panel: #fbfaf6;
  --panel-2: #efebe1;
  --line: #d8d2c4;
  --text: #1c241e;
  --muted: #6a736c;
  --accent: #8a6f3a;
  --accent-text: #fffaf0;
  --danger: #a14d3d;
  --hover: #ebe6da;
  --bubble-me: #e4edd9;
  --bubble-other: #ffffff;
  --unread: #8a6f3a;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  background-image:
    radial-gradient(ellipse at 0% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 50%),
    linear-gradient(180deg, var(--bg), color-mix(in srgb, var(--panel) 40%, var(--bg)));
}

.shell { display: flex; height: 100vh; min-height: 0; }
.sidebar {
  width: 300px; flex-shrink: 0; display: flex; flex-direction: column;
  background: var(--panel); border-right: 1px solid var(--line);
}
.sidebar-top {
  display: flex; align-items: center; gap: .6rem;
  padding: .9rem 1rem; border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--font); letter-spacing: .18em; font-size: 1.05rem; font-weight: 500;
}
.icon-btn {
  background: transparent; border: 1px solid var(--line); color: var(--text);
  width: 2rem; height: 2rem; border-radius: 8px; cursor: pointer; font: inherit;
}
.icon-btn:hover { background: var(--hover); }
.nav-scroll { flex: 1; overflow: auto; min-height: 0; padding-bottom: .5rem; }
.nav-block { padding: .75rem .75rem .25rem; }
.nav-block.grow { display: flex; flex-direction: column; min-height: 180px; }
.nav-block h2 {
  margin: 0; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
}
.block-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: .35rem; }
.block-actions { display: flex; gap: .25rem; }
.badge {
  font-size: .65rem; color: var(--accent-text); background: var(--accent);
  border-radius: 999px; padding: .05rem .35rem; margin-left: .25rem;
}
.nav-link, .item {
  display: block; width: 100%; text-align: left; border: 0; background: transparent;
  color: var(--text); padding: .55rem .65rem; border-radius: 8px; cursor: pointer;
  font: inherit; text-decoration: none;
}
.nav-link:hover, .item:hover, .item.active { background: var(--hover); }
.nav-link.disabled, .item.disabled { opacity: .45; cursor: not-allowed; }
.filter-input {
  width: 100%; margin: .25rem 0 .4rem; padding: .4rem .55rem;
  border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2);
  color: var(--text); font: inherit;
}
.item-list { display: flex; flex-direction: column; gap: .15rem; }
.nav-block.grow .item-list { flex: 1; overflow: auto; }
.line-item {
  display: grid; grid-template-columns: 40px 1fr auto; gap: .55rem; align-items: center;
  padding: .55rem .65rem; border-radius: 8px; cursor: pointer;
}
.line-item:hover, .line-item.active { background: var(--hover); }
.line-avatar {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 25%, var(--panel-2));
  color: var(--accent); font-family: var(--font); font-size: .95rem;
}
.line-title { font-size: .92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.line-preview { font-size: .78rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.line-meta { text-align: right; font-size: .7rem; color: var(--muted); }
.unread-dot {
  display: inline-grid; min-width: 1.1rem; height: 1.1rem; place-items: center;
  border-radius: 999px; background: var(--unread); color: var(--accent-text);
  font-size: .65rem; margin-top: .2rem;
}
.kind-tag { font-size: .65rem; color: var(--accent); letter-spacing: .04em; }

.account-bar {
  position: relative; border-top: 1px solid var(--line); padding: .55rem;
}
.account-btn {
  width: 100%; display: flex; gap: .65rem; align-items: center;
  background: transparent; border: 0; color: inherit; cursor: pointer; padding: .4rem; border-radius: 8px; font: inherit;
}
.account-btn:hover { background: var(--hover); }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-text); font-family: var(--font);
}
.account-meta { display: flex; flex-direction: column; align-items: flex-start; min-width: 0; }
.account-meta span { max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.muted { color: var(--muted); font-size: .78rem; }
.account-menu {
  position: absolute; left: .55rem; right: .55rem; bottom: calc(100% + .35rem);
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 10px 30px color-mix(in srgb, #000 25%, transparent); padding: .35rem; z-index: 20;
  display: flex; flex-direction: column;
}
.account-menu button, .account-menu a {
  text-align: left; padding: .55rem .65rem; border: 0; background: transparent;
  color: var(--text); text-decoration: none; border-radius: 6px; cursor: pointer; font: inherit;
}
.account-menu button:hover, .account-menu a:hover { background: var(--hover); }

.main {
  flex: 1; min-width: 0; display: flex; flex-direction: column; background: transparent;
}
.main-header {
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
}
.main-header h1 {
  margin: 0; font-family: var(--font); font-weight: 500; font-size: 1.35rem; letter-spacing: .04em;
}
.main-body { flex: 1; overflow: auto; padding: 1.25rem; min-height: 0; }

.cards { display: grid; gap: 1rem; grid-template-columns: 1fr; max-width: 920px; }
@media (min-width: 900px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.1rem;
}
.card h2 { margin: 0 0 .75rem; font-size: 1rem; font-family: var(--font); }
.ann-item { padding: .65rem 0; border-top: 1px solid var(--line); }
.ann-item:first-of-type { border-top: 0; }
.ann-item h3 { margin: 0 0 .25rem; font-size: .95rem; }
.ann-meta { font-size: .75rem; color: var(--muted); margin-bottom: .35rem; }
.ann-body { white-space: pre-wrap; line-height: 1.5; font-size: .9rem; }

.split {
  flex: 1; display: grid; grid-template-columns: 1fr 1fr; min-height: 0; gap: 0;
}
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
}
.pane {
  display: flex; flex-direction: column; min-height: 0; border-left: 1px solid var(--line);
}
.pane:first-child { border-left: 0; }
.pane-title {
  padding: .75rem 1rem; border-bottom: 1px solid var(--line);
  font-family: var(--font); letter-spacing: .06em; font-size: .95rem;
}
.messages {
  flex: 1; overflow: auto; padding: 1rem; display: flex; flex-direction: column; gap: .55rem;
}
.msg {
  max-width: 85%; padding: .55rem .75rem; border-radius: 12px; line-height: 1.45;
  white-space: pre-wrap; word-break: break-word; font-size: .92rem;
}
.msg.me { align-self: flex-end; background: var(--bubble-me); }
.msg.other { align-self: flex-start; background: var(--bubble-other); border: 1px solid var(--line); }
.msg .who { font-size: .7rem; color: var(--muted); margin-bottom: .2rem; }
.composer {
  display: flex; gap: .5rem; padding: .85rem; border-top: 1px solid var(--line);
}
.composer input, .composer textarea {
  flex: 1; background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: .65rem .75rem; font: inherit; resize: none;
}
.btn {
  background: var(--accent); color: var(--accent-text); border: 0; border-radius: 10px;
  padding: .55rem 1rem; cursor: pointer; font: inherit; font-weight: 600;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.danger { background: var(--danger); color: #fff; }

.settings-form { max-width: 420px; display: flex; flex-direction: column; gap: .85rem; }
.settings-form label { display: flex; flex-direction: column; gap: .35rem; font-size: .9rem; }
.settings-form select {
  padding: .55rem; border-radius: 8px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--text); font: inherit;
}

.modal {
  border: 1px solid var(--line); border-radius: 14px; padding: 0; background: var(--panel); color: var(--text);
  width: min(440px, 92vw);
}
.modal::backdrop { background: color-mix(in srgb, #000 45%, transparent); }
.modal form { padding: 1rem 1.1rem; display: flex; flex-direction: column; gap: .75rem; }
.modal h3 { margin: 0; font-family: var(--font); }
.modal input, .modal textarea, .modal select {
  width: 100%; padding: .55rem; border-radius: 8px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--text); font: inherit;
}
.modal-actions { display: flex; justify-content: flex-end; gap: .5rem; }
.stub { max-width: 560px; padding: 2rem 0; }
.stub p { color: var(--muted); line-height: 1.6; }
.empty { color: var(--muted); padding: 1rem; font-size: .9rem; }
.manage-row { display: flex; gap: .5rem; margin-top: .75rem; flex-wrap: wrap; }