:root {
  color-scheme: light dark;
  --bg: #f6f8f9; --card: #ffffff; --text: #10202a; --muted: #5a6b75; --line: #dfe6ea;
  --accent: #0f7ea8; --accent-text: #ffffff; --track: #e6edf0; --danger: #b3261e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #071019; --card: #0e1a24; --text: #dffbff; --muted: #9db1bc; --line: #1d2d39; --accent: #3cc3f0; --accent-text: #04121a; --track: #1a2a36; --danger: #ff8a80; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, "Segoe UI", sans-serif; }
.top { padding: 16px 24px; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; letter-spacing: .02em; color: var(--text); text-decoration: none; }
main { flex: 1; width: 100%; max-width: 640px; margin: 0 auto; padding: 32px 16px; }
footer { padding: 16px 24px; text-align: center; font-size: 14px; color: var(--muted); }
footer a, a { color: var(--accent); }
h1 { font-size: 26px; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 0 0 8px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 0 0 16px; }
button { font: inherit; border-radius: 8px; padding: 8px 16px; cursor: pointer; border: 1px solid var(--line); background: var(--card); color: var(--text); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; padding: 10px 20px; }
button.link { border: 0; background: none; padding: 0; color: var(--accent); text-decoration: underline; }
button:disabled { opacity: .6; cursor: default; }
.who { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 14px; color: var(--muted); margin-bottom: 24px; }
.meter { margin: 12px 0 0; }
.meter-head { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 4px; }
.bar { height: 8px; border-radius: 4px; background: var(--track); overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); }
.bar.full span { background: var(--danger); }
.devices { list-style: none; margin: 8px 0 0; padding: 0; }
.devices li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.devices li div { display: flex; flex-direction: column; min-width: 0; }
.devices strong { overflow-wrap: anywhere; }
.pair code { font-size: 20px; font-weight: 700; letter-spacing: .15em; padding: 2px 8px; border-radius: 6px; background: var(--track); }
.error { color: var(--danger); margin-top: 12px; min-height: 1.5em; }
h3 { font-size: 16px; margin: 0 0 4px; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-top: 12px; }
.plan { border: 1px solid var(--line); border-radius: 10px; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.plan p { margin: 0; }
.plan button { width: 100%; }
.billing { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-top: 16px; font-size: 14px; }
.billing .error { flex-basis: 100%; margin: 0; min-height: 0; }
.notice { border: 1px solid var(--accent); border-radius: 8px; padding: 10px 14px; }
.warn { color: var(--danger); }
.notice.warn { border-color: var(--danger); }
.testmode { font-size: 14px; border-left: 3px solid var(--accent); padding-left: 10px; }