:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #16181d; --muted: #6b7280; --line: #e5e7eb;
  --accent: #4f46e5; --accent-text: #fff; --bubble: #f1f2f5; --mine: #e0e7ff;
  --ok: #047857; --ok-bg: #d1fae5; --warn: #b45309; --warn-bg: #fef3c7; --err: #b91c1c; --err-bg: #fee2e2;
  --info: #1d4ed8; --info-bg: #dbeafe; --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #171a21; --text: #e8eaee; --muted: #9aa1ad; --line: #2a2f3a;
    --accent: #818cf8; --accent-text: #0f1115; --bubble: #222632; --mine: #2e335a;
    --ok: #34d399; --ok-bg: #0f2e25; --warn: #fbbf24; --warn-bg: #3a2a0a; --err: #f87171; --err-bg: #3b1214;
    --info: #93c5fd; --info-bg: #13233f;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; -webkit-text-size-adjust: 100%; }
a { color: var(--accent); }
h1, h2, h3 { margin: 0; }
h2 { font-size: 17px; } h3 { font-size: 14px; margin-bottom: 4px; }
.hidden { display: none !important; }
.muted { color: var(--muted); } .small { font-size: 13px; } .center { text-align: center; }
.err { color: var(--err); }

.btn { appearance: none; border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 10px;
  padding: 9px 14px; font: inherit; font-weight: 600; cursor: pointer; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.wide { width: 100%; padding: 13px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: default; }
.link { background: none; border: 0; color: var(--accent); font: inherit; cursor: pointer; padding: 0; }
.input { width: 100%; border: 1px solid var(--line); background: var(--bg); color: var(--text); border-radius: 10px; padding: 9px 12px; font: inherit; font-size: 16px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 10px) 16px 10px; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; letter-spacing: .5px; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg-btn { border: 0; background: var(--card); color: var(--muted); padding: 8px 12px; font: inherit; font-weight: 600; cursor: pointer; }
.seg-btn.active { background: var(--accent); color: var(--accent-text); }

.status { margin: 10px 16px 0; padding: 10px 14px; border-radius: 10px; background: var(--info-bg); color: var(--info); font-weight: 600; }
.status.ok { background: var(--ok-bg); color: var(--ok); } .status.err { background: var(--err-bg); color: var(--err); }
.status.busy::before { content: ""; display: inline-block; width: 10px; height: 10px; margin-right: 8px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.wrap { max-width: 760px; margin: 0 auto; padding: 14px 16px calc(env(safe-area-inset-bottom) + 30px); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; margin-bottom: 14px; }
.w-head, .plan-head, .feed-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.w-block { border-left: 3px solid var(--line); padding: 4px 0 4px 10px; margin-top: 10px; }
.w-block.warn { border-left-color: var(--warn); }
.w-block ul, .plan-list { margin: 0; padding-left: 18px; }
.w-block li, .plan-list li { margin: 3px 0; }
.plan-list li.warn { color: var(--warn); }
.toggle { display: flex; gap: 6px; align-items: center; font-size: 14px; color: var(--muted); }

.feed { display: flex; flex-direction: column; gap: 12px; }
.thread { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.thread.exception { border-color: var(--warn); box-shadow: 0 0 0 1px var(--warn) inset; }
.t-head { padding: 12px 14px 6px; }
.t-title { font-weight: 700; word-break: break-word; }
.t-title a { color: inherit; text-decoration: none; }
.t-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 4px; font-size: 13px; }
.chip, .badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--bubble); color: var(--muted); }
.badge.ok { background: var(--ok-bg); color: var(--ok); } .badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.info { background: var(--info-bg); color: var(--info); }
.t-body { padding: 4px 14px 8px; display: flex; flex-direction: column; gap: 6px; }
.msg-row { display: flex; }
.msg-row.mine { justify-content: flex-end; }
.bubble { max-width: 92%; background: var(--bubble); border-radius: 12px 12px 12px 4px; padding: 8px 11px; }
.mine .bubble { background: var(--mine); border-radius: 12px 12px 4px 12px; }
.level-warning .bubble { background: var(--warn-bg); color: var(--warn); }
.level-error .bubble { background: var(--err-bg); color: var(--err); }
.b-head { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; font-size: 14px; }
.b-step { font-size: 11px; text-transform: uppercase; letter-spacing: .4px; opacity: .6; }
.b-head time { margin-left: auto; font-size: 12px; opacity: .6; }
.b-text { font-size: 14px; word-break: break-word; }
.b-extra { font-size: 12px; opacity: .7; margin-top: 2px; }
.t-foot { display: flex; gap: 8px; padding: 8px 14px 12px; border-top: 1px solid var(--line); align-items: center; }
.reply { display: flex; gap: 8px; flex: 1; }
.reply .input { padding: 7px 10px; }

.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: min(380px, 100%); background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 28px; text-align: center; }
.login-card > * + * { margin-top: 12px; }
.login-logo { width: 72px; height: 72px; border-radius: 18px; }
.msg { min-height: 1.4em; font-size: 14px; } .msg.err { color: var(--err); }
.note { background: var(--warn-bg); color: var(--warn); border-radius: 10px; padding: 8px; }

@media (max-width: 520px) {
  .controls { width: 100%; }
  .controls .btn { flex: 1; }
  .t-foot { flex-wrap: wrap; }
}