:root {
  --bg: #fbfaf7;
  --bg-elev: #ffffff;
  --fg: #16181d;
  --fg-muted: #5c6270;
  --line: #e6e3dc;
  --accent: #1f6feb;
  --accent-fg: #ffffff;
  --accent-soft: #e8f0fe;
  --ok: #1a7f37;
  --warn: #9a6700;
  --warn-soft: #fff8e5;
  --danger: #cf222e;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --radius: 14px;
  --maxw: 1040px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --bg-elev: #171a21;
    --fg: #e8eaf0;
    --fg-muted: #9aa1b1;
    --line: #262b36;
    --accent: #5b9dff;
    --accent-fg: #0b1220;
    --accent-soft: #14233d;
    --ok: #3fb950;
    --warn: #d4a72c;
    --warn-soft: #2b2410;
    --danger: #ff6b6b;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1115; --bg-elev: #171a21; --fg: #e8eaf0; --fg-muted: #9aa1b1; --line: #262b36;
  --accent: #5b9dff; --accent-fg: #0b1220; --accent-soft: #14233d; --ok: #3fb950;
  --warn: #d4a72c; --warn-soft: #2b2410; --danger: #ff6b6b;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans);
  line-height: 1.6; font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

header.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 800; letter-spacing: 0.12em; font-size: 18px; color: var(--fg); }
.brand span { color: var(--accent); }
nav a { margin-left: 18px; color: var(--fg-muted); font-size: 14px; }

.hero { padding: 64px 0 32px; display: grid; gap: 40px; grid-template-columns: 1.1fr 1fr; align-items: start; }
@media (max-width: 820px) { .hero { grid-template-columns: 1fr; padding-top: 40px; } }
.hero h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.1; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 19px; color: var(--fg-muted); margin: 0 0 24px; max-width: 34em; }
.lines { display: grid; gap: 6px; font-family: var(--mono); font-size: 14px; color: var(--fg-muted); margin-bottom: 28px; }
.lines b { color: var(--fg); font-weight: 600; }

.card { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h2 { margin: 0 0 4px; font-size: 18px; }
.card .sub { margin: 0 0 16px; color: var(--fg-muted); font-size: 14px; }

.ptt {
  display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 18px 0 8px;
  user-select: none; -webkit-user-select: none; touch-action: none;
}
.ptt button {
  width: 132px; height: 132px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-fg); font-size: 15px; font-weight: 700;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 35%, transparent);
  transition: transform .08s ease, box-shadow .2s ease;
}
.ptt button:active, .ptt button.recording { transform: scale(.96); box-shadow: 0 0 0 10px color-mix(in srgb, var(--accent) 22%, transparent); }
.ptt button:disabled { background: var(--line); color: var(--fg-muted); box-shadow: none; cursor: not-allowed; }
.ptt .hint { font-size: 13px; color: var(--fg-muted); min-height: 1.4em; }

.transcript {
  min-height: 92px; padding: 12px 14px; border-radius: 10px; border: 1px dashed var(--line);
  background: var(--bg); font-size: 17px; white-space: pre-wrap; word-break: break-word;
}
.transcript .partial { color: var(--fg-muted); }
.transcript:empty::before { content: attr(data-placeholder); color: var(--fg-muted); }

.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; align-items: center; }
.btn {
  appearance: none; border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg);
  padding: 8px 14px; border-radius: 9px; font-size: 14px; cursor: pointer; font-family: inherit;
}
.btn:hover { border-color: var(--fg-muted); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: transparent; font-weight: 600; }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.engine { display: grid; gap: 8px; padding: 12px; border-radius: 10px; background: var(--bg); border: 1px solid var(--line); font-size: 14px; margin-top: 14px; }
.engine label { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.engine input { margin-top: 4px; }
.engine .name { font-weight: 600; }
.engine .desc { color: var(--fg-muted); font-size: 13px; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; vertical-align: middle; }
.badge.local { background: color-mix(in srgb, var(--ok) 15%, transparent); color: var(--ok); }
.badge.remote { background: var(--warn-soft); color: var(--warn); }
.badge.soon { background: var(--line); color: var(--fg-muted); }

.status { font-family: var(--mono); font-size: 12px; color: var(--fg-muted); margin-top: 10px; display: flex; gap: 12px; flex-wrap: wrap; }
.status .dot::before { content: "●"; margin-right: 5px; color: var(--ok); }

section { padding: 48px 0; border-top: 1px solid var(--line); }
section h2.sec { font-size: 26px; margin: 0 0 8px; letter-spacing: -0.01em; }
section p.sec { color: var(--fg-muted); margin: 0 0 28px; max-width: 40em; }

.flow { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; font-family: var(--mono); font-size: 13px; }
@media (max-width: 820px) { .flow { grid-template-columns: repeat(2, 1fr); } }
.flow div { padding: 14px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-elev); text-align: center; }
.flow div b { display: block; font-size: 14px; margin-bottom: 4px; font-family: var(--sans); }
.flow div.vault { border-color: var(--accent); background: var(--accent-soft); }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 820px) { .grid3, .grid2 { grid-template-columns: 1fr; } }
.grid3 .card h3, .grid2 .card h3 { margin: 0 0 6px; font-size: 16px; }
.grid3 .card p, .grid2 .card p { margin: 0; color: var(--fg-muted); font-size: 14px; }

ul.vault-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
ul.vault-list li { padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); font-size: 14px; display: grid; gap: 4px; }
ul.vault-list li time { font-family: var(--mono); font-size: 12px; color: var(--fg-muted); }
ul.vault-list li .txt { white-space: pre-wrap; word-break: break-word; }
ul.vault-list:empty::before { content: attr(data-empty); color: var(--fg-muted); font-size: 14px; }

form.waitlist { display: grid; gap: 14px; }
form.waitlist input[type=email] {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--fg); font-size: 16px; font-family: inherit;
}
form.waitlist .platforms { display: flex; flex-wrap: wrap; gap: 10px 18px; font-size: 14px; }
form.waitlist .platforms label { display: flex; gap: 6px; align-items: center; }
form.waitlist .hp { position: absolute; left: -9999px; }
.msg { font-size: 14px; min-height: 1.4em; }
.msg.ok { color: var(--ok); } .msg.err { color: var(--danger); }

footer { padding: 32px 0 48px; border-top: 1px solid var(--line); color: var(--fg-muted); font-size: 13px; display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer a { color: var(--fg-muted); }

.prose { max-width: 720px; padding: 40px 0 64px; }
.prose h1 { font-size: 34px; letter-spacing: -0.02em; }
.prose h2 { font-size: 20px; margin-top: 32px; }
.prose li { margin: 6px 0; }
.prose code { font-family: var(--mono); font-size: 0.9em; background: var(--bg-elev); border: 1px solid var(--line); padding: 1px 5px; border-radius: 5px; }