/* 凝焦 — 官网样式
   Tokens are the same family as the app's settings window: a periwinkle accent
   over a cool slate, glass surfaces, generous spacing. */

:root {
  --bg: #0b0e17;
  --bg-soft: #111524;
  --bg-elev: rgba(255, 255, 255, 0.045);
  --bg-elev-strong: rgba(255, 255, 255, 0.08);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #eef1f8;
  --text-2: #a8b0c4;
  --text-3: #6f7893;
  --accent: #6d8ff7;
  --accent-deep: #4c7df3;
  --accent-soft: rgba(109, 143, 247, 0.16);
  --accent-glow: rgba(109, 143, 247, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --blur: saturate(150%) blur(18px);
}

html[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --bg-elev: rgba(255, 255, 255, 0.78);
  --bg-elev-strong: #ffffff;
  --line: rgba(16, 24, 48, 0.10);
  --line-strong: rgba(16, 24, 48, 0.18);
  --text: #131a2b;
  --text-2: #4a5470;
  --text-3: #7c869f;
  --accent: #4c7df3;
  --accent-deep: #3563d6;
  --accent-soft: rgba(76, 125, 243, 0.12);
  --accent-glow: rgba(76, 125, 243, 0.28);
  --shadow: 0 20px 48px rgba(20, 32, 64, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

/* A soft wash behind everything: the product is a blur, so the page wears one. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 520px at 78% -8%, var(--accent-soft), transparent 65%),
    radial-gradient(760px 620px at 8% 12%, rgba(120, 160, 255, 0.10), transparent 60%);
  pointer-events: none;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

code {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: var(--bg-elev-strong);
  border: 1px solid var(--line);
}

.wrap { width: min(1140px, 100% - 48px); margin-inline: auto; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px; top: 12px; z-index: 100;
  padding: 8px 14px; border-radius: 10px;
  background: var(--bg-soft); border: 1px solid var(--line-strong);
}

/* ---------- nav ---------- */

.nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--line);
}

.nav-inner { display: flex; align-items: center; gap: 24px; height: 62px; }

.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-icon { border-radius: 8px; width: 32px; height: 32px; align-self: center; }
.brand-name { font-weight: 650; letter-spacing: -0.01em; }
.brand-sub { color: var(--text-3); font-size: 13px; letter-spacing: 0.02em; }

.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.nav-links a { color: var(--text-2); transition: color 0.18s ease; }
.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; align-items: center; gap: 10px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  border-radius: 11px;
  font-size: 15px; font-weight: 600;
  border: 1px solid var(--line-strong);
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  color: #fff; border-color: transparent;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  box-shadow: 0 10px 26px var(--accent-glow);
}
.btn-ghost { background: var(--bg-elev); color: var(--text); }

.theme-toggle {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  color: var(--text-2);
  cursor: pointer;
}
.theme-toggle:hover { color: var(--text); }

.lang-toggle {
  display: inline-grid; place-items: center;
  min-width: 36px; height: 36px; padding: 0 10px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  color: var(--text-2);
  cursor: pointer;
  font-size: 13px; font-weight: 600; letter-spacing: 0.02em;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.lang-toggle:hover { color: var(--text); border-color: var(--text-3); }

html[data-theme="dark"] .icon-sun { display: none; }
html[data-theme="light"] .icon-moon { display: none; }

/* ---------- hero ---------- */

.hero { padding: 76px 0 64px; }
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-3);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(38px, 5.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.03em;
  font-weight: 680;
}
.hero h1 .accent {
  background: linear-gradient(96deg, var(--accent), #9db4ff 60%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede { margin: 0 0 28px; color: var(--text-2); font-size: 17px; max-width: 46ch; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero-facts {
  list-style: none; margin: 26px 0 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 8px 22px;
  color: var(--text-3); font-size: 14px;
}
.hero-facts li { display: flex; align-items: center; gap: 8px; }
.hero-facts li::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
}

/* ---------- demo ---------- */

.demo {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--bg-soft), color-mix(in srgb, var(--accent) 10%, var(--bg-soft)));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.demo-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.dot { width: 11px; height: 11px; border-radius: 50%; background: var(--line-strong); }
.demo-hint { margin-left: 10px; font-size: 12px; color: var(--text-3); }

.demo-screen {
  position: relative;
  height: 340px;
  padding: 22px;
  background:
    radial-gradient(560px 300px at 78% 8%, rgba(120, 160, 255, 0.20), transparent 70%),
    linear-gradient(180deg, rgba(10, 14, 26, 0.55), rgba(10, 14, 26, 0.75));
}
html[data-theme="light"] .demo-screen {
  background:
    radial-gradient(560px 300px at 78% 8%, rgba(120, 160, 255, 0.22), transparent 70%),
    linear-gradient(180deg, #dfe6f6, #cfd9f0);
}

.demo-win {
  position: absolute;
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-soft);
  border: 1px solid var(--line-strong);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  filter: blur(5px) saturate(70%);
  opacity: 0.72;
  transform: scale(0.985);
  transition: filter 0.35s ease, opacity 0.35s ease, transform 0.35s ease, box-shadow 0.35s ease;
}
.demo-win.is-focused {
  filter: none;
  opacity: 1;
  transform: none;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), 0 0 0 1px var(--accent-glow);
}
.demo-win:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.demo-win--a { left: 26px; top: 30px; width: 58%; height: 190px; }
.demo-win--b { right: 24px; top: 62px; width: 40%; height: 150px; }
.demo-win--c { left: 78px; bottom: 24px; width: 46%; height: 120px; }

.demo-titlebar {
  display: flex; align-items: center; gap: 6px;
  height: 26px; padding: 0 10px;
  background: var(--bg-elev-strong);
  border-bottom: 1px solid var(--line);
}
.demo-titlebar::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); opacity: 0.8;
}
.demo-title { font-size: 11px; color: var(--text-3); }

.demo-body { display: flex; flex-direction: column; gap: 8px; padding: 14px; }
.demo-body .ln, .demo-body .bubble {
  display: block; height: 8px; border-radius: 4px;
  background: var(--line-strong);
}
.demo-body .bubble { height: 16px; border-radius: 8px; background: var(--accent-soft); }
.demo-body .bubble.alt { background: var(--line-strong); align-self: flex-end; }
.demo-body.mono .ln { height: 6px; background: var(--accent-soft); }
.w80 { width: 80%; } .w90 { width: 90%; } .w70 { width: 70%; }
.w65 { width: 65%; } .w60 { width: 60%; } .w55 { width: 55%; }
.w45 { width: 45%; } .w40 { width: 40%; } .w75 { width: 75%; }

.demo-desktop-line {
  position: absolute; left: 12%; right: 12%; bottom: 8px; height: 26px;
  border-radius: 13px;
  background: var(--bg-elev-strong);
  border: 1px solid var(--line);
  filter: blur(3px);
  opacity: 0.5;
}

.demo-caption {
  margin: 0; padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px; color: var(--text-3);
}

/* ---------- sections ---------- */

.section { padding: 78px 0; }
.section-alt {
  background: color-mix(in srgb, var(--bg-soft) 60%, transparent);
  border-block: 1px solid var(--line);
}

.section-title {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.4vw, 34px);
  letter-spacing: -0.02em;
  font-weight: 660;
}
.section-lede { margin: 0 0 34px; color: var(--text-2); max-width: 62ch; }

.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.card {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card h3 { margin: 14px 0 8px; font-size: 17px; font-weight: 620; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--text-2); font-size: 15px; }

.card-icon {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent);
}

.tag {
  display: inline-block; margin: 0 0 8px;
  padding: 3px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 12px; font-weight: 600;
}

/* ---------- steps ---------- */

.steps { list-style: none; margin: 0 0 34px; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.step {
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
}
.step h3 { margin: 10px 0 8px; font-size: 16px; font-weight: 620; }
.step p { margin: 0; color: var(--text-2); font-size: 14.5px; }
.step-num {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; border-radius: 9px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 14px; font-weight: 700;
}

.note {
  margin: 0 0 26px; padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
}
.note h3 { margin: 0 0 12px; font-size: 16px; font-weight: 620; }
.note ul { margin: 0; padding-left: 20px; color: var(--text-2); font-size: 15px; }
.note li + li { margin-top: 8px; }
.note strong { color: var(--text); }

.backends { margin-top: 6px; }

/* ---------- privacy ---------- */

.privacy { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 48px; align-items: center; }

.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.checks li { position: relative; padding-left: 30px; color: var(--text-2); font-size: 15.5px; }
.checks li::before {
  content: ""; position: absolute; left: 6px; top: 10px;
  width: 10px; height: 6px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

.privacy-art { margin: 0; }
.privacy-art-inner {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 26px;
  border: 1px solid var(--line);
  background:
    radial-gradient(420px 300px at 70% 20%, var(--accent-soft), transparent 70%),
    linear-gradient(160deg, var(--bg-soft), color-mix(in srgb, var(--accent) 8%, var(--bg-soft)));
  overflow: hidden;
}
.pa-window {
  position: absolute; left: 14%; top: 32%;
  width: 62%; height: 42%;
  border-radius: 14px;
  background: var(--bg-elev-strong);
  border: 1px solid var(--line-strong);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.35);
}
.pa-window.ghost {
  left: auto; right: -6%; top: 8%;
  width: 44%; height: 30%;
  filter: blur(9px); opacity: 0.55;
}
.pa-window.ghost:last-child { top: auto; bottom: -4%; right: 8%; width: 52%; height: 26%; }

/* ---------- faq ---------- */

.faq { display: grid; gap: 12px; }
details {
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 0 20px;
}
details[open] { padding-bottom: 4px; border-color: var(--line-strong); }
summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 600;
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: ""; width: 8px; height: 8px; flex: none;
  border-right: 2px solid var(--text-3);
  border-bottom: 2px solid var(--text-3);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
details[open] summary::after { transform: rotate(-135deg); }
details p { margin: 0 0 16px; color: var(--text-2); font-size: 15px; max-width: 74ch; }

/* ---------- download ---------- */

.download-inner { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 44px; align-items: start; }

.install { margin: 26px 0 0; padding-left: 22px; color: var(--text-2); font-size: 15px; }
.install li + li { margin-top: 8px; }

.download-side {
  padding: 26px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.download-icon { width: 96px; height: 96px; margin: 0 0 18px; border-radius: 22px; box-shadow: 0 14px 34px rgba(0, 0, 0, 0.35); }

.meta { margin: 0; display: grid; gap: 10px; }
.meta > div { display: flex; justify-content: space-between; gap: 16px; font-size: 14.5px; }
.meta dt { color: var(--text-3); }
.meta dd { margin: 0; font-weight: 600; }

.update-note {
  margin: 18px 0 0; padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--text-3); font-size: 13.5px;
}

/* ---------- footer ---------- */

.footer { border-top: 1px solid var(--line); padding: 34px 0 46px; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.footer-links { display: flex; gap: 20px; font-size: 14.5px; color: var(--text-2); }
.footer-links a:hover { color: var(--text); }
.footer-note { width: 100%; margin: 6px 0 0; color: var(--text-3); font-size: 13px; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero-inner, .privacy, .download-inner { grid-template-columns: minmax(0, 1fr); }
  .hero-demo { order: -1; }
  .nav-links { display: none; }
  .section { padding: 60px 0; }
  .hero { padding: 52px 0 44px; }
}

@media (max-width: 560px) {
  .wrap { width: min(1140px, 100% - 32px); }
  .demo-screen { height: 300px; padding: 16px; }
  .demo-win--a { left: 16px; top: 22px; width: 66%; height: 150px; }
  .demo-win--b { right: 14px; top: 48px; width: 44%; height: 120px; }
  .demo-win--c { left: 40px; bottom: 18px; width: 54%; height: 100px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- pricing / purchase / legal (subpages) ---------- */

.subhero { padding: 72px 0 56px; text-align: center; }
.subhero .eyebrow { text-align: center; }
.subhero h1 { font-size: clamp(34px, 5vw, 52px); margin: 0 0 16px; letter-spacing: -0.03em; font-weight: 680; }
.subhero h1 .accent {
  background: linear-gradient(96deg, var(--accent), #9db4ff 60%, var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.subhero .lede { margin: 0 auto 30px; max-width: 56ch; }

.price-card {
  min-width: 300px;
  max-width: 460px; margin: 0 auto;
  padding: 34px; border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow);
}
.price-row { display: flex; align-items: baseline; justify-content: center; gap: 8px; margin: 0 0 6px; }
.price { font-size: 52px; font-weight: 700; letter-spacing: -0.03em; }
.price-cur { font-size: 24px; color: var(--text-2); font-weight: 600; }
.price-sub { text-align: center; color: var(--text-3); font-size: 14px; margin: 0 0 22px; }
.buy-row { display: flex; flex-direction: column; gap: 10px; align-items: stretch; }
.buy-row .btn { justify-content: center; }
.buy-note { text-align: center; color: var(--text-3); font-size: 13px; margin: 14px 0 0; }
.buy-note strong { color: var(--text); }

/* two-tier pricing */
.price-grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 760px; margin: 0 auto;
}
.price-card--pro { border-color: var(--accent); box-shadow: 0 24px 60px var(--accent-glow); }
.plan-name { margin: 0 0 12px; text-align: center; font-size: 16px; font-weight: 700; letter-spacing: 0.02em; }
.plan-tag {
  display: inline-block; margin: 0 0 10px; padding: 3px 12px;
  border-radius: 999px; background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 700; letter-spacing: 0.05em;
}
.plan-tag--wrap { text-align: center; }

.card--pro { border-color: var(--accent); }
.feat-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 10px; }
.feat-list li { position: relative; padding-left: 26px; color: var(--text-2); font-size: 14.5px; }
.feat-list li::before {
  content: ""; position: absolute; left: 4px; top: 9px;
  width: 10px; height: 6px; border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent); transform: rotate(-45deg);
}

/* hide body until i18n has applied, to avoid a flash of the wrong language */
html.i18n-loading body { visibility: hidden; }

@media (max-width: 720px) {
  .price-grid { grid-template-columns: minmax(0, 1fr); max-width: 460px; }
}

.legal { max-width: 780px; margin-inline: auto; }
.legal .updated { color: var(--text-3); font-size: 14px; margin: 4px 0 28px; }
.legal h2 { font-size: 21px; margin: 34px 0 12px; letter-spacing: -0.01em; }
.legal h3 { font-size: 16px; margin: 22px 0 8px; }
.legal p, .legal li { color: var(--text-2); font-size: 15px; }
.legal ul { padding-left: 20px; }
.legal li + li { margin-top: 6px; }

.ba-img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); }