:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5d6573;
  --border: #e2e5ea;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --code-bg: #f0f2f5;
  --ok: #1f8a4c;
  --error: #c4302b;
  --weak: #d9443f; --fair: #e59a1c; --good: #b5b51f; --strong: #3aa35b; --excellent: #1f7a4a;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --text: #e7e9ee;
    --muted: #9aa3b2;
    --border: #2a2f3a;
    --accent: #5b8cff;
    --code-bg: #1f232c;
    --ok: #4cc27c;
    --error: #ff6b63;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); }
code, .mono, pre { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }
h1 { font-size: 1.9rem; margin: 0 0 .25rem; letter-spacing: -.01em; }
h2 { font-size: 1.05rem; margin: 0 0 .75rem; }
.card h2:not(:first-child) { margin-top: 1.25rem; }

.container { width: 100%; max-width: 820px; margin: 0 auto; padding: 0 16px; }
main.container { flex: 1; padding-top: 24px; padding-bottom: 32px; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.brand-mark { color: var(--accent); }
.nav { display: flex; gap: 4px; }
.nav a { padding: 6px 12px; border-radius: 8px; color: var(--muted); text-decoration: none; }
.nav a:hover { background: var(--code-bg); color: var(--text); }
.nav a.active { background: var(--code-bg); color: var(--text); font-weight: 600; }

.footer { color: var(--muted); font-size: .85rem; padding-bottom: 24px; text-align: center; }

.lead { color: var(--muted); margin: 0 0 1rem; }
.page-head { margin-bottom: 16px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}

.btn {
  font: inherit; font-size: .95rem; cursor: pointer; border-radius: 8px; padding: 8px 14px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  text-decoration: none; display: inline-flex; align-items: center; justify-content: center; white-space: nowrap;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn-ghost { background: transparent; }
.btn-small { padding: 4px 10px; font-size: .85rem; }

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 12px; }
.row.grow > input:not(.num) { flex: 1; min-width: 0; }
.row.spread { justify-content: space-between; margin-top: 0; }
.row.spread h2 { margin: 0; }

input[type=text], input[type=number], input[type=password], textarea {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; width: 100%;
}
input:focus, textarea:focus, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
input:disabled { opacity: .5; }
input.num { width: 90px; }
input[type=range] { accent-color: var(--accent); }
textarea { resize: vertical; }

.field { margin-top: 14px; }
.field > label { display: block; font-size: .9rem; color: var(--muted); margin-bottom: 4px; }
.field .row { margin-top: 0; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px 16px; margin-top: 14px; }
.check { display: flex; gap: 8px; align-items: flex-start; cursor: pointer; }
.check input { margin-top: 4px; accent-color: var(--accent); }
.check small { display: block; color: var(--muted); }

.hint { color: var(--muted); font-size: .85rem; margin: 8px 0 0; }
.muted { color: var(--muted); }
.error { color: var(--error); }
.ok { color: var(--ok); }

/* Password */
.pw-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.pw-list li { display: flex; gap: 8px; align-items: center; }
.pw {
  flex: 1; min-width: 0; overflow-wrap: anywhere; font-size: 1.15rem; padding: 10px 12px;
  background: var(--code-bg); border-radius: 8px; user-select: all;
}
.meter { margin-top: 14px; }
.meter-track { height: 6px; border-radius: 3px; background: var(--code-bg); overflow: hidden; }
.meter-fill { height: 100%; width: 0; transition: width .2s; }
.meter-fill.weak { background: var(--weak); }
.meter-fill.fair { background: var(--fair); }
.meter-fill.good { background: var(--good); }
.meter-fill.strong { background: var(--strong); }
.meter-fill.excellent { background: var(--excellent); }
.meter-label { font-size: .85rem; color: var(--muted); }

/* Shared bits */
.narrow { max-width: 560px; }
.guide { color: var(--muted); font-size: .92rem; }
.guide h2 { color: var(--text); }
.guide ul { padding-left: 1.2rem; margin: 0; }
.guide li { margin: 6px 0; }
.row.tight { margin-top: 0; gap: 6px; }
.status-big { font-size: 1.05rem; margin: 16px 0 8px; }
.warn { color: var(--fair); }
select {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; width: 100%;
}
.facts { list-style: none; padding: 0; color: var(--muted); max-width: 560px; }
.facts li { margin: 6px 0; }
.badge {
  display: inline-block; font-size: .8rem; padding: 2px 10px; border-radius: 999px;
  background: var(--code-bg); color: var(--muted); border: 1px solid var(--border);
}
.badge-host { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
.tag { font-size: .7rem; padding: 0 6px; border-radius: 999px; background: var(--code-bg); color: var(--muted); }
.code { font-size: .82rem; color: var(--muted); margin-top: 2px; }
.code strong { color: var(--text); letter-spacing: .04em; }

.tabs { display: flex; gap: 4px; margin-bottom: 12px; }
.tab {
  font: inherit; cursor: pointer; padding: 8px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: transparent; color: var(--muted);
}
.tab[aria-selected="true"] { background: var(--surface); color: var(--text); border-color: var(--accent); font-weight: 600; }

.dropzone {
  margin-top: 14px; padding: 20px; border: 2px dashed var(--border); border-radius: var(--radius);
  text-align: center; color: var(--muted);
}
.dropzone.over { border-color: var(--accent); background: var(--code-bg); }
.file-list { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 4px; }
.file-list li { display: flex; gap: 8px; align-items: center; justify-content: space-between; overflow-wrap: anywhere; }
.file-card {
  display: flex; gap: 10px; align-items: center; padding: 10px 12px; margin-top: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
}
.file-icon { font-size: 1.5rem; }
.file-info { flex: 1; min-width: 0; display: flex; flex-direction: column; overflow-wrap: anywhere; }
.file-info progress { width: 100%; margin-top: 4px; accent-color: var(--accent); }
.secret {
  margin: 4px 0 0; padding: 12px; background: var(--code-bg); border-radius: 8px;
  white-space: pre-wrap; overflow-wrap: anywhere;
}

/* Share steps */
.progress-steps { list-style: none; padding: 0; margin: 0 0 8px; display: flex; gap: 8px; flex-wrap: wrap; counter-reset: step; }
.progress-steps li {
  counter-increment: step; flex: 1; min-width: 140px; font-size: .85rem; color: var(--muted);
  padding: 8px 10px; border-radius: 8px; background: var(--code-bg); border: 1px solid transparent;
}
.progress-steps li::before { content: counter(step) ". "; font-weight: 700; }
.progress-steps li.active { border-color: var(--accent); color: var(--text); }
.progress-steps li.done { color: var(--ok); }
.progress-steps li.done::before { content: "✓ "; }
.request {
  display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap;
  padding: 10px 12px; margin-bottom: 8px; border-radius: 10px;
  background: var(--code-bg); border: 1px solid var(--accent);
}

/* Chat */
main.container:has(.chat-layout) { max-width: 1100px; }
.chat-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.chat-head h1 { margin-bottom: 4px; }
.chat-layout { display: grid; grid-template-columns: 1fr 280px; gap: 16px; }
.chat-main {
  display: flex; flex-direction: column; height: min(70vh, 720px); min-height: 380px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.chat-main.over { border-color: var(--accent); }
.requests:not(:empty) { padding: 10px 10px 0; }
.messages { flex: 1; overflow-y: auto; list-style: none; margin: 0; padding: 12px; display: flex; flex-direction: column; gap: 6px; }
.msg { max-width: 78%; align-self: flex-start; background: var(--code-bg); padding: 6px 10px 8px; border-radius: 12px 12px 12px 4px; }
.msg.mine { align-self: flex-end; background: var(--accent); color: var(--accent-text); border-radius: 12px 12px 4px 12px; }
.msg.mine .time { color: inherit; opacity: .75; }
.msg.mine .file-card { color: var(--text); }
.msg .meta { display: flex; gap: 8px; align-items: baseline; font-size: .75rem; }
.msg .who { font-weight: 700; }
.msg .time { color: var(--muted); margin-left: auto; }
.msg .body { white-space: pre-wrap; overflow-wrap: anywhere; }
.sys { align-self: center; font-size: .8rem; color: var(--muted); text-align: center; max-width: 90%; }
.sys.error { color: var(--error); }
.composer { display: flex; gap: 6px; align-items: flex-end; padding: 10px; border-top: 1px solid var(--border); }
.composer textarea { flex: 1; resize: none; max-height: 200px; }
.attach { font-size: 1.1rem; padding: 6px 10px; }
.chat-side { display: flex; flex-direction: column; gap: 12px; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.panel h3 { margin: 0 0 8px; font-size: .95rem; }
.panel .field { margin-top: 8px; }
.panel .check { margin-top: 12px; }
.members { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.members .who { font-weight: 600; }
.members .row .btn { margin-left: auto; }
@media (max-width: 760px) {
  .chat-layout { grid-template-columns: 1fr; }
  .chat-side { order: -1; }
  .chat-main { height: 65vh; }
  .msg { max-width: 90%; }
}
.footer .version { display: block; margin-top: 4px; font-size: .8rem; }
.footer .version a { color: var(--muted); }