:root {
  --bg: #F6F8FB; --card: #FFFFFF; --ink: #0B2545; --ink2: #475569; --ink3: #64748B; --line: #E2E8F0;
  --blue: #2563EB; --blue-soft: #EFF6FF; --green: #15803D; --green-soft: #F0FDF4; --amber: #92400E; --amber-soft: #FFFBEB;
  --red: #B91C1C; --red-soft: #FEF2F2; --agent: #0B2545; --agent-ink: #F8FAFC; --me: #2563EB; --me-ink: #FFFFFF;
  --radius: 16px; --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A1222; --card: #111C30; --ink: #E2E8F0; --ink2: #A9B6C9; --ink3: #8090A6; --line: #23324A;
    --blue: #60A5FA; --blue-soft: #13284A; --green: #4ADE80; --green-soft: #10291C; --amber: #FBBF24; --amber-soft: #2B220E;
    --red: #F87171; --red-soft: #2E1416; --agent: #1B2A44; --agent-ink: #E2E8F0; --me: #2563EB; --me-ink: #FFFFFF;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body { font: 16px/1.5 'IBM Plex Sans', system-ui, sans-serif; min-height: 100dvh; -webkit-font-smoothing: antialiased; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--blue); }
h1, h2, h3 { font-family: 'Sora', system-ui, sans-serif; letter-spacing: -.02em; margin: 0; }
.splash { min-height: 100dvh; display: grid; place-items: center; }

/* ---- signed-out screens ---- */
.welcome { max-width: 440px; margin: 0 auto; padding: 48px 20px 32px; min-height: 100dvh; display: flex; flex-direction: column; }
.welcome .brand { display: flex; align-items: center; gap: 12px; margin-bottom: 36px; }
.welcome .brand b { font-family: 'Sora', sans-serif; font-size: 28px; font-weight: 600; letter-spacing: -.03em; }
.welcome h1 { font-size: 30px; line-height: 1.15; margin-bottom: 10px; }
.welcome p.lede { color: var(--ink2); margin: 0 0 28px; }
.welcome .foot { margin-top: auto; padding-top: 28px; font-size: 13px; color: var(--ink3); }
.stack { display: flex; flex-direction: column; gap: 12px; }
label.f { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; color: var(--ink2); }
input.t, textarea.t, select.t { width: 100%; border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 12px 14px; font-size: 16px; }
input.t:focus, textarea.t:focus { outline: 2px solid var(--blue); outline-offset: 0; border-color: transparent; }
.code { letter-spacing: .4em; font-size: 24px !important; text-align: center; font-family: 'Sora', sans-serif; }
.btn { appearance: none; border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 12px 16px; font-weight: 600; cursor: pointer; min-height: 48px; }
.btn.pri { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.sm { min-height: 36px; padding: 6px 12px; font-size: 14px; border-radius: 10px; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--blue); }
.btn.danger { color: var(--red); }
.btn:disabled { opacity: .55; cursor: default; }
.or { display: flex; align-items: center; gap: 12px; color: var(--ink3); font-size: 13px; margin: 6px 0; }
.or::before, .or::after { content: ''; flex: 1; height: 1px; background: var(--line); }
.err { color: var(--red); font-size: 14px; min-height: 1.2em; }
.note { font-size: 14px; color: var(--ink2); background: var(--blue-soft); border-radius: 12px; padding: 12px 14px; }

/* ---- app shell ---- */
.shell { max-width: 720px; margin: 0 auto; min-height: 100dvh; display: flex; flex-direction: column; }
.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 10px; padding: calc(env(safe-area-inset-top) + 12px) 16px 12px; background: var(--bg); border-bottom: 1px solid var(--line); }
.top .who { display: flex; align-items: center; gap: 10px; min-width: 0; }
.top .who b { font-family: 'Sora', sans-serif; font-size: 17px; display: block; }
.top .who small { color: var(--ink3); font-size: 12.5px; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top .sp { flex: 1; }
.iconbtn { position: relative; appearance: none; border: 0; background: transparent; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; cursor: pointer; color: var(--ink); }
.iconbtn:hover { background: var(--card); }
.dot { position: absolute; top: 6px; right: 6px; min-width: 17px; height: 17px; border-radius: 999px; background: var(--red); color: #fff; font-size: 11px; font-weight: 600; display: grid; place-items: center; padding: 0 4px; }
main.view { flex: 1; padding: 16px 16px calc(env(safe-area-inset-bottom) + 92px); }
nav.tabs { position: fixed; bottom: 0; left: 0; right: 0; z-index: 6; background: var(--card); border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom); }
nav.tabs .in { max-width: 720px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); }
nav.tabs a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 9px 4px 10px; text-decoration: none; color: var(--ink3); font-size: 12px; font-weight: 500; position: relative; }
nav.tabs a[aria-current="page"] { color: var(--blue); }
nav.tabs a .dot { top: 4px; right: calc(50% - 22px); }
.avatar { width: 36px; height: 36px; border-radius: 11px; background: var(--agent); color: var(--agent-ink); display: grid; place-items: center; font-family: 'Sora', sans-serif; font-weight: 600; flex: none; }

/* ---- cards and lists ---- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.sec { display: flex; align-items: baseline; justify-content: space-between; margin: 22px 2px 10px; }
.sec h2 { font-size: 17px; }
.sec small { color: var(--ink3); }
.list { display: flex; flex-direction: column; gap: 8px; }
.empty { color: var(--ink3); font-size: 14.5px; padding: 6px 2px; }
.task { display: flex; gap: 12px; align-items: flex-start; }
.task .chk { flex: none; width: 26px; height: 26px; border-radius: 8px; border: 2px solid var(--line); background: transparent; cursor: pointer; margin-top: 1px; display: grid; place-items: center; }
.task .chk:hover { border-color: var(--blue); }
.task .chk.on { background: var(--green); border-color: var(--green); color: #fff; }
.task .body { flex: 1; min-width: 0; }
.task .body b { font-weight: 500; display: block; word-wrap: break-word; }
.task .meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.pill { font-size: 12.5px; font-weight: 500; border-radius: 999px; padding: 2px 9px; background: var(--bg); color: var(--ink2); border: 1px solid var(--line); }
.pill.amber { background: var(--amber-soft); color: var(--amber); border-color: transparent; }
.pill.blue { background: var(--blue-soft); color: var(--blue); border-color: transparent; }
.pill.green { background: var(--green-soft); color: var(--green); border-color: transparent; }
.pill.red { background: var(--red-soft); color: var(--red); border-color: transparent; }
.row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.proposed { border-color: #FDE68A; }

/* ---- chat ---- */
.chat { display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 86%; padding: 10px 14px; border-radius: 18px; white-space: pre-wrap; word-wrap: break-word; }
.msg.agent { align-self: flex-start; background: var(--agent); color: var(--agent-ink); border-bottom-left-radius: 6px; }
.msg.user { align-self: flex-end; background: var(--me); color: var(--me-ink); border-bottom-right-radius: 6px; }
.act { align-self: flex-start; font-size: 13px; color: var(--ink2); display: flex; align-items: center; gap: 6px; padding: 0 6px; }
.act::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.act.error::before { background: var(--red); }
.typing { align-self: flex-start; color: var(--ink3); font-size: 14px; padding: 0 6px; }
.composer { position: fixed; left: 0; right: 0; bottom: calc(env(safe-area-inset-bottom) + 58px); z-index: 5; background: linear-gradient(transparent, var(--bg) 30%); padding: 14px 16px 10px; }
.composer form { max-width: 688px; margin: 0 auto; display: flex; gap: 8px; }
.composer input { flex: 1; border-radius: 999px; padding-left: 18px; }
.composer .btn { border-radius: 999px; min-width: 64px; }
.chips { display: flex; gap: 8px; overflow-x: auto; padding: 2px 0 8px; max-width: 688px; margin: 0 auto; scrollbar-width: none; }
.chips button { flex: none; border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 6px 12px; font-size: 14px; cursor: pointer; }
.chatpad { height: 120px; }

/* ---- purposes and onboarding ---- */
.purpose h3 { font-size: 17px; margin-bottom: 4px; }
.purpose .code { font-family: 'IBM Plex Sans', sans-serif; letter-spacing: 0; font-size: 12.5px !important; color: var(--ink3); text-align: left; }
.purpose p { color: var(--ink2); margin: 6px 0 10px; }
.purpose ul { margin: 0 0 8px; padding-left: 20px; color: var(--ink2); font-size: 14.5px; }
.purpose .k { font-size: 13px; font-weight: 600; color: var(--ink); margin-top: 8px; }
.steps { display: flex; gap: 6px; margin-bottom: 20px; }
.steps i { height: 4px; flex: 1; border-radius: 4px; background: var(--line); }
.steps i.on { background: var(--blue); }
.ledger { font-size: 13.5px; color: var(--ink2); }
.ledger div { display: flex; justify-content: space-between; gap: 10px; padding: 7px 0; border-top: 1px solid var(--line); }
.ledger div:first-child { border-top: 0; }
.ledger code { font-family: ui-monospace, monospace; font-size: 12px; color: var(--ink3); }

/* ---- sheet (notifications) ---- */
.sheet { position: fixed; inset: 0; z-index: 20; background: rgba(2, 8, 23, .45); display: flex; align-items: flex-end; justify-content: center; }
.sheet .panel { background: var(--bg); width: 100%; max-width: 720px; max-height: 80dvh; overflow: auto; border-radius: 20px 20px 0 0; padding: 18px 16px calc(env(safe-area-inset-bottom) + 18px); }
.ntf { padding: 12px 0; border-top: 1px solid var(--line); }
.ntf:first-of-type { border-top: 0; }
.ntf b { display: block; font-weight: 500; }
.ntf small { color: var(--ink3); }
.ntf.unread b::before { content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--blue); margin-right: 8px; vertical-align: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }