:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #0a0a0a;
  --muted: #6b6b6b;
  --faint: #a3a3a3;
  --line: #e5e5e5;
  --line-strong: #d4d4d4;
  --field: #ffffff;
  --inverse: #0a0a0a;
  --inverse-text: #fafafa;
  --danger: #c4314b;
  --ring: rgba(10, 10, 10, .12);
  --shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 8px 24px -12px rgba(0, 0, 0, .08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --surface: #111111;
    --text: #ededed;
    --muted: #8f8f8f;
    --faint: #5c5c5c;
    --line: #1f1f1f;
    --line-strong: #2e2e2e;
    --field: #0a0a0a;
    --inverse: #ededed;
    --inverse-text: #0a0a0a;
    --danger: #ff6369;
    --ring: rgba(237, 237, 237, .14);
    --shadow: 0 0 0 1px rgba(255, 255, 255, .02), 0 16px 40px -20px rgba(0, 0, 0, .8);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font: 14px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--text); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
h1 { font-size: 22px; line-height: 1.25; letter-spacing: -0.02em; font-weight: 600; margin: 0 0 6px; }

.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--text); text-decoration: none; font-weight: 600; font-size: 15px; letter-spacing: -0.01em; }

/* ---- Sign-in / invite ------------------------------------------------------------ */
body.auth {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, color-mix(in srgb, var(--text) 5%, transparent), transparent),
    var(--bg);
}
body.auth::before { /* faint dot grid, fading out from the top */
  content: ""; position: fixed; inset: 0; pointer-events: none;
  background-image: radial-gradient(color-mix(in srgb, var(--text) 9%, transparent) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(to bottom, #000, transparent 55%);
}
.auth {
  position: relative; min-height: 100vh; display: flex; flex-direction: column; align-items: center;
  padding: 72px 20px 28px;
}
.auth > .brand { margin-bottom: 40px; }
.card {
  width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 32px 28px 28px; box-shadow: var(--shadow);
  animation: appear .35s ease-out both;
}
@keyframes appear { from { opacity: 0; transform: translateY(4px); } }
.sub { color: var(--muted); margin: 0 0 24px; }

.field { display: block; margin-bottom: 16px; }
.field > span { display: block; font-size: 13px; font-weight: 500; margin-bottom: 7px; }
.field input {
  width: 100%; height: 40px; padding: 0 12px; font: inherit; color: var(--text);
  background: var(--field); border: 1px solid var(--line-strong); border-radius: 8px; outline: none;
  transition: border-color .12s, box-shadow .12s;
}
.field input:hover { border-color: var(--faint); }
.field input:focus { border-color: var(--text); box-shadow: 0 0 0 3px var(--ring); }
.input-wrap { position: relative; }
.input-wrap input { padding-right: 60px; }
.reveal {
  position: absolute; right: 5px; top: 5px; height: 30px; padding: 0 9px; border: 0; border-radius: 6px;
  background: transparent; color: var(--muted); font: inherit; font-size: 12.5px; font-weight: 500; cursor: pointer;
}
.reveal:hover { color: var(--text); background: color-mix(in srgb, var(--text) 6%, transparent); }
.hint { display: block; color: var(--muted); font-size: 12.5px; margin-top: 6px; }
.field.shake { animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

.strength { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; margin-top: 8px; }
.strength i { height: 3px; border-radius: 3px; background: var(--line); transition: background .2s; }
.strength[data-score="1"] i:nth-child(-n+1),
.strength[data-score="2"] i:nth-child(-n+2),
.strength[data-score="3"] i:nth-child(-n+3),
.strength[data-score="4"] i { background: var(--text); }
.strength[data-score="1"] i:nth-child(1) { background: var(--danger); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; width: 100%; height: 40px;
  margin-top: 8px; padding: 0 16px; border: 1px solid var(--inverse); border-radius: 8px; cursor: pointer;
  font: inherit; font-weight: 500; color: var(--inverse-text); background: var(--inverse); text-decoration: none;
  transition: opacity .12s, box-shadow .12s;
}
.btn:hover { opacity: .88; }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ring); }
.btn.busy { cursor: progress; opacity: .7; }
.btn.busy::before { content: ""; width: 13px; height: 13px; border-radius: 50%; border: 1.5px solid currentColor; border-right-color: transparent; animation: spin .6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--line-strong); }
.btn-secondary:hover { opacity: 1; background: color-mix(in srgb, var(--text) 5%, transparent); }
.btn-sm { height: 32px; width: auto; margin: 0; padding: 0 12px; font-size: 13px; }

.alert { border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent); color: var(--danger);
  background: color-mix(in srgb, var(--danger) 6%, transparent); border-radius: 8px; padding: 9px 12px; font-size: 13px; margin-bottom: 18px; }
.aside { color: var(--muted); font-size: 13px; margin: 20px 0 0; text-align: center; }
.fine { margin-top: auto; padding-top: 48px; display: flex; align-items: center; gap: 10px; color: var(--faint); font-size: 12px; }
.fine .sep { width: 3px; height: 3px; border-radius: 50%; background: currentColor; }

/* ---- Signed in ------------------------------------------------------------------- */
body.app { min-height: 100vh; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 56px; padding: 0 24px;
  border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 80%, transparent); backdrop-filter: blur(8px); position: sticky; top: 0; }
.me { display: flex; align-items: center; gap: 10px; }
.me form { margin: 0 0 0 6px; }
.me-text { display: flex; flex-direction: column; line-height: 1.25; font-size: 13px; }
.me-text b { font-weight: 500; }
.me-text small { color: var(--muted); font-size: 12px; }
.avatar { width: 28px; height: 28px; border-radius: 50%; display: inline-grid; place-items: center; flex: none;
  font-size: 11px; font-weight: 600; color: var(--text); background: color-mix(in srgb, var(--text) 8%, transparent); border: 1px solid var(--line-strong); }
.home { max-width: 640px; margin: 48px auto; padding: 0 20px; }
.home h1 { margin-bottom: 20px; }
.home .card { max-width: none; padding: 20px; animation: none; }
.net-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.label { color: var(--muted); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: .06em; }
.badge { display: inline-flex; align-items: center; gap: 6px; height: 22px; padding: 0 8px; border-radius: 999px; font-size: 12px; font-weight: 500;
  border: 1px solid var(--line-strong); color: var(--muted); }
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.net b { display: block; font-weight: 500; font-size: 15px; }
.net small { display: block; color: var(--muted); margin-top: 2px; }
.bar { height: 2px; background: var(--line); margin-top: 18px; border-radius: 2px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 10%; background: var(--text); transition: width .8s ease; }
.net[data-state="busy"] .badge::before { animation: blink 1.2s ease-in-out infinite; }
@keyframes blink { 50% { opacity: .25; } }
.net[data-state="ok"] .badge { color: var(--text); border-color: var(--text); }
.net[data-state="ok"] .bar { opacity: 0; transition: opacity .6s .6s; }
.net[data-state="error"] .badge, .net[data-state="warn"] .badge { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 45%, transparent); }
.net[data-state="error"] .bar i { background: var(--danger); }

@media (max-width: 520px) {
  .auth { padding-top: 40px; }
  .auth > .brand { margin-bottom: 28px; }
  .card { padding: 26px 20px 22px; }
  .me-text { display: none; }
  .topbar { padding: 0 16px; }
  .home { margin-top: 32px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}