/* AI Translate — landing page. Shares the lue-app family design language. */

:root {
  --bg: #f4f6fa;
  --bg-grad: radial-gradient(1100px 520px at 80% -8%, #ecebfe 0%, transparent 58%),
             radial-gradient(900px 420px at 5% 0%, #e7f0fe 0%, transparent 55%);
  --surface: #ffffff;
  --surface-2: #f3f5f9;
  --surface-3: #eef1f6;
  --border: #e5e8ef;
  --border-strong: #d3d8e3;
  --ink: #141923;
  --muted: #687388;
  --faint: #a6adbb;

  --brand: #5b5bf0;
  --brand-2: #4f46e5;
  --brand-ink: #ffffff;

  --c-indigo: #5b5bf0;
  --c-blue: #2f7ef5;
  --c-violet: #8b5cf6;
  --c-teal: #0ea5a3;
  --c-green: #11a866;
  --c-amber: #d68a04;
  --c-rose: #e23b46;

  --shadow-sm: 0 1px 2px rgba(20, 25, 35, 0.04), 0 1px 3px rgba(20, 25, 35, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 25, 35, 0.07);
  --shadow-lg: 0 18px 50px rgba(35, 35, 90, 0.13);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1016;
    --bg-grad: radial-gradient(1100px 520px at 80% -8%, #1a1840 0%, transparent 58%),
               radial-gradient(900px 420px at 5% 0%, #102036 0%, transparent 55%);
    --surface: #161b24;
    --surface-2: #1c222d;
    --surface-3: #222a37;
    --border: #262d39;
    --border-strong: #333c4b;
    --ink: #e7eaf1;
    --muted: #97a1b2;
    --faint: #5f6a7c;
    --brand: #7c7cff;
    --brand-2: #6d6df7;
    --c-indigo: #8a8aff;
    --c-blue: #5fa0ff;
    --c-violet: #a78bfa;
    --c-teal: #2dd4d0;
    --c-green: #36cf86;
    --c-amber: #f0ad3c;
    --c-rose: #ff6b73;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 22px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 22px 60px rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd { font-family: var(--mono); }
h1, h2, h3 { letter-spacing: -0.018em; line-height: 1.15; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

/* ---------- keyboard chips ---------- */
kbd {
  display: inline-block; padding: 2px 8px; font-size: 0.82em; font-weight: 600;
  color: var(--ink); background: var(--surface); border: 1px solid var(--border-strong);
  border-bottom-width: 2px; border-radius: 7px; box-shadow: var(--shadow-sm); white-space: nowrap;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(10px);
}
.topbar .wrap { display: flex; align-items: center; gap: 16px; padding: 12px 22px; }
.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.logo {
  display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px;
  color: #fff; background: linear-gradient(150deg, #6d6df7, #4f46e5); box-shadow: var(--shadow-sm); flex: none;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.12; }
.brand-name { font-weight: 750; font-size: 1.08rem; }
.brand-sub { font-size: 0.74rem; color: var(--muted); }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { color: var(--muted); font-weight: 600; font-size: 0.9rem; padding: 7px 11px; border-radius: 8px; }
.nav a:hover { color: var(--ink); background: var(--surface-2); text-decoration: none; }
.nav .nav-hide { }
@media (max-width: 760px) { .nav .nav-hide { display: none; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 17px; border: 1px solid var(--border-strong); border-radius: 11px;
  background: var(--surface); color: var(--ink); font: inherit; font-weight: 650; font-size: 0.95rem;
  cursor: pointer; white-space: nowrap; box-shadow: var(--shadow-sm);
  transition: border-color .12s, background .12s, transform .04s, filter .12s;
}
.btn:hover { border-color: var(--brand); background: var(--surface-2); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn svg { flex: none; }
.btn.primary { background: linear-gradient(150deg, #6d6df7, #4f46e5); color: var(--brand-ink); border-color: transparent; box-shadow: 0 6px 18px color-mix(in srgb, var(--brand) 35%, transparent); }
.btn.primary:hover { filter: brightness(1.07); background: linear-gradient(150deg, #6d6df7, #4f46e5); }
.btn.ghost { background: transparent; box-shadow: none; }
.btn.sm { padding: 7px 12px; font-size: 0.85rem; border-radius: 9px; }
.lang-btn { min-width: 0; }

/* visible keyboard focus (WCAG 2.4.7) */
a:focus-visible, .btn:focus-visible, .copy:focus-visible, button:focus-visible {
  outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 8px;
}

/* ---------- hero ---------- */
.hero { padding: 60px 0 26px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 44px; align-items: center; }
@media (max-width: 880px) { .hero-grid { grid-template-columns: 1fr; gap: 30px; } }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 16px;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.02em; color: var(--brand);
  background: color-mix(in srgb, var(--brand) 10%, var(--surface)); border: 1px solid color-mix(in srgb, var(--brand) 28%, var(--border));
  padding: 6px 12px; border-radius: 999px;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-green) 22%, transparent); }
.hero h1 { font-size: clamp(2rem, 4.6vw, 3rem); font-weight: 800; margin: 0 0 16px; }
.hero h1 .grad { background: linear-gradient(120deg, #6d6df7, #8b5cf6 55%, #2f7ef5); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { font-size: 1.12rem; color: var(--muted); margin: 0 0 26px; max-width: 36em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.dl-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 18px; font-size: 0.84rem; color: var(--muted); align-items: center; }
.dl-meta .pill { display: inline-flex; align-items: center; gap: 6px; }
.dl-meta b { color: var(--ink); font-weight: 650; }
.sha { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 0.78rem; }
.sha code { color: var(--muted); }

/* hero side panel: the three triggers as a faux app window */
.window {
  border-radius: 16px; border: 1px solid var(--border); background: var(--surface);
  box-shadow: var(--shadow-lg); overflow: hidden;
}
.window-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.window-bar .dots { display: flex; gap: 6px; }
.window-bar .dots i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.window-bar .dots i:nth-child(1) { background: #ff5f57; }
.window-bar .dots i:nth-child(2) { background: #febc2e; }
.window-bar .dots i:nth-child(3) { background: #28c840; }
.window-bar .title { font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.window-body { padding: 16px; display: flex; flex-direction: column; gap: 11px; }
.trig {
  display: flex; align-items: center; gap: 13px; padding: 13px 14px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--surface-2);
}
.trig .ic { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; flex: none; color: var(--accent, var(--brand)); background: color-mix(in srgb, var(--accent, var(--brand)) 14%, var(--surface)); }
.trig[data-accent="indigo"] { --accent: var(--c-indigo); }
.trig[data-accent="violet"] { --accent: var(--c-violet); }
.trig[data-accent="blue"]   { --accent: var(--c-blue); }
.trig .t-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.trig .t-name { font-weight: 680; font-size: 0.95rem; }
.trig .t-desc { font-size: 0.82rem; color: var(--muted); }
.trig .t-key { margin-left: auto; }

/* ---------- sections ---------- */
section.block { padding: 46px 0; border-top: 1px solid var(--border); }
.sec-head { max-width: 40em; margin: 0 0 30px; }
.sec-head .kicker { font-size: 0.78rem; font-weight: 750; letter-spacing: 0.05em; text-transform: uppercase; color: var(--brand); margin: 0 0 9px; }
.sec-head h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 10px; font-weight: 780; }
.sec-head p { color: var(--muted); margin: 0; font-size: 1.02rem; }

/* feature grid */
.grid { display: grid; gap: 16px; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 820px) { .cols-3 { grid-template-columns: 1fr; } .cols-2 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow-sm);
}
.card .ic { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 11px; margin-bottom: 13px; color: var(--accent, var(--brand)); background: color-mix(in srgb, var(--accent, var(--brand)) 13%, var(--surface)); }
.card[data-accent="indigo"] { --accent: var(--c-indigo); }
.card[data-accent="violet"] { --accent: var(--c-violet); }
.card[data-accent="blue"]   { --accent: var(--c-blue); }
.card[data-accent="teal"]   { --accent: var(--c-teal); }
.card[data-accent="green"]  { --accent: var(--c-green); }
.card[data-accent="amber"]  { --accent: var(--c-amber); }
.card h3 { font-size: 1.05rem; margin: 0 0 7px; }
.card p { margin: 0; color: var(--muted); font-size: 0.93rem; }
.card .kbd-row { margin-top: 11px; }

/* ---------- code blocks ---------- */
.code {
  position: relative; margin: 0 0 14px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); box-shadow: var(--shadow-sm); overflow: hidden;
}
.code pre { margin: 0; padding: 15px 56px 15px 16px; overflow-x: auto; }
.code code { font-size: 0.86rem; line-height: 1.65; color: var(--ink); white-space: pre; }
.code .copy {
  position: absolute; top: 9px; right: 9px; padding: 5px 10px; font-size: 0.76rem; font-weight: 650;
  border: 1px solid var(--border-strong); border-radius: 7px; background: var(--surface-2);
  color: var(--muted); cursor: pointer; transition: color .12s, border-color .12s;
}
.code .copy:hover { color: var(--ink); border-color: var(--brand); }
.code .copy.done { color: var(--c-green); border-color: var(--c-green); }
.code .c-comment { color: var(--faint); }
.code .c-key { color: var(--c-violet); }
.code .c-str { color: var(--c-green); }

/* ---------- steps ---------- */
.steps { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }
.step { display: flex; flex-direction: column; }
.step-head { display: flex; align-items: center; gap: 11px; margin-bottom: 12px; }
.step-num { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; flex: none; font-weight: 750; font-size: 0.9rem; color: var(--brand-ink); background: linear-gradient(150deg, #6d6df7, #4f46e5); }
.step-head h3 { margin: 0; font-size: 1.06rem; }
.step .muted { font-size: 0.92rem; }

/* ---------- tables ---------- */
.table-card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); background: var(--surface); }
.tbl-scroll { overflow-x: auto; }
table.t { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 460px; }
table.t th, table.t td { text-align: left; padding: 11px 15px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.t thead th { background: var(--surface-2); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); font-weight: 700; }
table.t tbody tr:last-child td { border-bottom: none; }
table.t code { font-size: 0.84rem; color: var(--ink); background: var(--surface-2); padding: 1px 6px; border-radius: 5px; }
table.t .tag { display: inline-block; font-size: 0.72rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.tag.free { color: var(--c-green); background: color-mix(in srgb, var(--c-green) 14%, var(--surface)); }
.tag.best { color: var(--c-violet); background: color-mix(in srgb, var(--c-violet) 14%, var(--surface)); }
.tag.gfw  { color: var(--c-amber); background: color-mix(in srgb, var(--c-amber) 16%, var(--surface)); }

/* ---------- callout ---------- */
.callout {
  display: flex; gap: 13px; padding: 15px 17px; border-radius: var(--radius-sm);
  border: 1px solid color-mix(in srgb, var(--c-amber) 32%, var(--border));
  background: color-mix(in srgb, var(--c-amber) 8%, var(--surface)); margin: 16px 0 0;
}
.callout svg { flex: none; color: var(--c-amber); margin-top: 1px; }
.callout p { margin: 0; font-size: 0.92rem; color: var(--ink); }
.note { display: flex; gap: 13px; padding: 15px 17px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-2); margin: 16px 0 0; }
.note svg { flex: none; color: var(--brand); margin-top: 1px; }
.note p { margin: 0; font-size: 0.92rem; }

/* ---------- web2local cards ---------- */
.w2l-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 18px; }
.w2l-badge {
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border-radius: 999px;
  font-size: 0.8rem; font-weight: 650; border: 1px solid var(--border-strong); background: var(--surface); white-space: nowrap;
}
.w2l-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--faint); flex: none; }
.w2l-badge[data-state="checking"] { color: var(--c-amber); border-color: color-mix(in srgb, var(--c-amber) 35%, var(--border)); }
.w2l-badge[data-state="checking"] .w2l-dot { background: var(--c-amber); animation: w2lpulse 1.1s ease-in-out infinite; }
.w2l-badge[data-state="detected"] { color: var(--c-green); border-color: color-mix(in srgb, var(--c-green) 35%, var(--border)); background: color-mix(in srgb, var(--c-green) 9%, var(--surface)); }
.w2l-badge[data-state="detected"] .w2l-dot { background: var(--c-green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-green) 22%, transparent); }
.w2l-badge[data-state="offline"] { color: var(--muted); }
.w2l-badge[data-state="offline"] .w2l-dot { background: var(--faint); }
@keyframes w2lpulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.w2l-port { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 0.85rem; font-weight: 600; padding-left: 11px; background: var(--surface); border: 1px solid var(--border-strong); border-radius: 10px; box-shadow: var(--shadow-sm); }
.w2l-port input { width: 74px; padding: 7px 8px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface-2); color: var(--ink); font: inherit; font-variant-numeric: tabular-nums; }
.w2l-port input:focus { outline: 2px solid color-mix(in srgb, var(--brand) 45%, transparent); border-color: var(--brand); }
.w2l-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 14px; }
.w2l-translate { display: flex; gap: 9px; margin-top: 11px; }
.w2l-translate input { flex: 1; min-width: 0; padding: 9px 12px; border: 1px solid var(--border-strong); border-radius: 9px; background: var(--surface-2); color: var(--ink); font: inherit; }
.w2l-translate input:focus { outline: 2px solid color-mix(in srgb, var(--brand) 45%, transparent); border-color: var(--brand); }
.btn:disabled, .w2l-translate input:disabled { opacity: 0.5; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border-strong); background: var(--surface); }
.w2l-out {
  margin: 13px 0 0; padding: 12px 14px; max-height: 220px; overflow: auto;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface-2); color: var(--ink); font-family: var(--mono); font-size: 0.82rem; line-height: 1.55; white-space: pre-wrap; word-break: break-word;
}
.w2l-out.out-dim { color: var(--muted); }
.w2l-out.out-ok { border-color: color-mix(in srgb, var(--c-green) 38%, var(--border)); }
.w2l-out.out-err { border-color: color-mix(in srgb, var(--c-rose) 40%, var(--border)); color: var(--c-rose); }

/* ---------- download band ---------- */
.dl-band { margin-top: 8px; }
.dl-band .card { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; justify-content: space-between; padding: 26px 28px; border: 1px solid color-mix(in srgb, var(--brand) 24%, var(--border)); background:
  linear-gradient(120deg, color-mix(in srgb, var(--brand) 9%, var(--surface)), var(--surface)); }
.dl-band .lead-txt h3 { margin: 0 0 4px; font-size: 1.25rem; }
.dl-band .lead-txt p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* ---------- footer ---------- */
footer.foot { border-top: 1px solid var(--border); margin-top: 10px; }
footer.foot .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; padding: 26px 22px 40px; }
footer.foot .f-brand { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 0.9rem; }
footer.foot .f-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 0.9rem; }
footer.foot .f-links a { color: var(--muted); font-weight: 600; }
footer.foot .f-links a:hover { color: var(--ink); }

.lang-zh { display: none; }
:root[data-lang="zh"] .lang-en { display: none; }
:root[data-lang="zh"] .lang-zh { display: initial; }
:root[data-lang="zh"] body { font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif; }