:root {
  --ink: #0f1e33;
  --ink-2: #44546b;
  --muted: #74839a;
  --line: #e3ebf3;
  --bg: #fbfdff;
  --tint: #f2f8fd;
  --blue: #3b8cf0;
  --sky: #6bb4f5;
  --teal: #3cc8b4;
  --grad: linear-gradient(135deg, #3b8cf0 0%, #45b6e6 50%, #3cc8b4 100%);
  --shadow: 0 1px 2px rgba(15, 30, 51, .04), 0 8px 24px -8px rgba(15, 30, 51, .10);
  --shadow-lg: 0 24px 60px -20px rgba(38, 100, 170, .30);
  --r: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: Inter, system-ui, -apple-system, "PingFang SC", "Hiragino Sans", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.mono { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .92em; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }
.small { font-size: .85rem; color: var(--muted); }
.small a { color: var(--blue); }
.muted { color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; border-radius: 12px; transition: transform .15s, box-shadow .15s, background .15s;
  white-space: nowrap;
}
.btn-sm { padding: 9px 16px; font-size: .9rem; }
.btn-lg { padding: 15px 26px; font-size: 1.02rem; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px -10px rgba(59, 140, 240, .7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -12px rgba(59, 140, 240, .8); }
.btn-ghost { background: #fff; border: 1px solid var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: #c7d6e6; transform: translateY(-2px); }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 253, 255, .78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(227, 235, 243, .8);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; }
.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: .93rem; color: var(--ink-2); font-weight: 500; }
.nav-links a:hover { color: var(--ink); }
.gh-link { display: inline-flex; align-items: center; gap: 6px; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 72px 0 96px; }
.grid-bg {
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(59, 140, 240, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 140, 240, .07) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 30%, transparent 80%);
}
.hero::before {
  content: ""; position: absolute; z-index: -1; width: 680px; height: 680px; right: -120px; top: -160px;
  background: radial-gradient(circle, rgba(107, 180, 245, .30), transparent 65%);
}
.hero::after {
  content: ""; position: absolute; z-index: -1; width: 520px; height: 520px; left: -160px; bottom: -220px;
  background: radial-gradient(circle, rgba(60, 200, 180, .20), transparent 65%);
}
.hero-inner { display: grid; grid-template-columns: 1.02fr 1fr; gap: 56px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; background: #fff; border: 1px solid var(--line);
  font-size: .83rem; font-weight: 600; color: var(--ink-2); box-shadow: var(--shadow);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px rgba(60, 200, 180, .2); }
h1 { font-size: clamp(2.6rem, 5.4vw, 4.3rem); line-height: 1.04; letter-spacing: -.045em; font-weight: 800; margin: 22px 0 20px; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.18rem; color: var(--ink-2); max-width: 540px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 34px 0 26px; }
.meta { list-style: none; display: flex; flex-wrap: wrap; gap: 20px; font-size: .9rem; color: var(--ink-2); font-weight: 500; }
.meta li { display: flex; align-items: center; gap: 6px; }
.meta svg { width: 17px; height: 17px; color: var(--teal); }

.hero-art { position: relative; }
.hero-img { border-radius: 28px; overflow: hidden; box-shadow: var(--shadow-lg); border: 6px solid #fff; }
.float-card {
  position: absolute; background: rgba(255, 255, 255, .92); backdrop-filter: blur(10px);
  border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-lg);
  padding: 14px 18px;
}
.fc-timer { left: -34px; top: 34px; display: flex; flex-direction: column; gap: 4px; min-width: 170px; animation: float 6s ease-in-out infinite; }
.fc-label { font-size: .74rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.fc-value { font-size: 1.45rem; font-weight: 500; color: var(--ink); }
.bar { height: 6px; border-radius: 6px; background: var(--line); overflow: hidden; }
.bar span { display: block; height: 100%; width: 22%; background: var(--grad); border-radius: 6px; animation: drain 12s linear infinite; }
.fc-break { right: -22px; bottom: 34px; display: flex; align-items: center; gap: 12px; animation: float 7s ease-in-out infinite reverse; }
.fc-break svg { width: 38px; height: 38px; padding: 8px; border-radius: 10px; background: var(--grad); color: #fff; }
.fc-break strong { display: block; font-size: .95rem; }
.fc-break span { font-size: .82rem; color: var(--muted); }
@keyframes float { 50% { transform: translateY(-10px); } }
@keyframes drain { from { width: 34%; } to { width: 4%; } }

/* Sections */
.section { padding: 100px 0; }
.section-tint { background: var(--tint); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 12px;
}
h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); line-height: 1.12; letter-spacing: -.035em; font-weight: 800; }
.section-head p { margin-top: 14px; font-size: 1.1rem; color: var(--ink-2); }
h3 { font-size: 1.08rem; letter-spacing: -.015em; font-weight: 700; margin-bottom: 6px; }

.ic {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(59, 140, 240, .12), rgba(60, 200, 180, .14));
  color: var(--blue); margin-bottom: 16px;
}
.ic svg { width: 24px; height: 24px; }

/* Story */
.story { display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: center; }
.story-quote {
  background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 40px; box-shadow: var(--shadow);
  position: relative;
}
.story-quote .q { width: 40px; height: 40px; color: var(--sky); opacity: .5; margin-bottom: 12px; }
.story-quote p { font-size: 1.3rem; font-weight: 600; letter-spacing: -.02em; line-height: 1.45; }
.story-quote .story-sub { font-size: 1rem; font-weight: 400; color: var(--ink-2); margin-top: 18px; letter-spacing: 0; }
.author { display: flex; align-items: center; gap: 12px; margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.avatar { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; background: var(--grad); color: #fff; font-weight: 700; font-size: .9rem; }
.author strong { display: block; font-size: .95rem; }
.author span { font-size: .85rem; color: var(--muted); }
.why-grid { display: grid; gap: 16px; }
.why-card { display: grid; grid-template-columns: 46px 1fr; column-gap: 18px; padding: 22px; border-radius: var(--r); border: 1px solid transparent; transition: background .2s, border-color .2s; }
.why-card:hover { background: #fff; border-color: var(--line); box-shadow: var(--shadow); }
.why-card .ic { grid-row: span 2; margin: 0; }
.why-card p { color: var(--ink-2); font-size: .97rem; }

/* Features */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 26px;
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature p { color: var(--ink-2); font-size: .93rem; }

/* Steps */
.steps { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: s; position: relative; }
.steps::before {
  content: ""; position: absolute; top: 22px; left: 8%; right: 8%; height: 2px;
  background: linear-gradient(90deg, var(--sky), var(--teal)); opacity: .35; z-index: -1;
}
.steps li { text-align: center; padding: 0 8px; }
.num {
  width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; margin: 0 auto 18px;
  background: var(--grad); color: #fff; font-weight: 800; box-shadow: 0 0 0 7px var(--bg), 0 10px 20px -8px rgba(59, 140, 240, .7);
}
.steps p { color: var(--ink-2); font-size: .94rem; }
.setup { margin-top: 64px; background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 32px; box-shadow: var(--shadow); }
.setup-head { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.setup-head svg { width: 26px; height: 26px; color: var(--blue); }
.setup-head h3 { margin: 0; font-size: 1.2rem; }
.setup-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.setup-grid div { padding: 16px; border-radius: 14px; background: var(--tint); }
.setup-grid strong { display: block; font-size: .95rem; margin-bottom: 4px; }
.setup-grid span { font-size: .88rem; color: var(--ink-2); }

/* Honest + OSS */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 40px; box-shadow: var(--shadow); }
.card h2 { font-size: 1.9rem; margin-bottom: 14px; }
.card p { color: var(--ink-2); margin-bottom: 12px; }
.honest { background: linear-gradient(160deg, #fff 40%, #eef8f6); }
.repo {
  display: flex; align-items: center; gap: 14px; margin: 22px 0 16px; padding: 16px 18px;
  border: 1px solid var(--line); border-radius: 14px; transition: border-color .2s, transform .2s;
}
.repo:hover { border-color: var(--sky); transform: translateY(-2px); }
.repo strong { display: block; }
.repo span { font-size: .85rem; color: var(--muted); }
.repo .arrow { margin-left: auto; color: var(--blue); }
.code {
  font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .85rem; line-height: 1.9;
  background: #0f1e33; color: #d6e6f7; padding: 16px 18px; border-radius: 12px; overflow-x: auto; white-space: nowrap;
}
.code .c { color: var(--teal); margin-right: 6px; }

/* FAQ */
#faq details { border-bottom: 1px solid var(--line); padding: 20px 4px; }
#faq summary { cursor: pointer; font-weight: 600; font-size: 1.05rem; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
#faq summary::-webkit-details-marker { display: none; }
#faq summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--blue); transition: transform .2s; }
#faq details[open] summary::after { transform: rotate(45deg); }
#faq details p { color: var(--ink-2); margin-top: 10px; }

/* Final CTA */
.final { padding: 110px 0; position: relative; overflow: hidden; }
.final::before {
  content: ""; position: absolute; inset: 40px 24px; z-index: -1; border-radius: 36px; max-width: 1132px; margin: 0 auto;
  background: radial-gradient(ellipse at top, rgba(107, 180, 245, .25), transparent 60%), linear-gradient(160deg, #eef6fe, #eafaf6);
  border: 1px solid var(--line);
}
.final-inner { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.final-inner img { filter: drop-shadow(0 16px 24px rgba(59, 140, 240, .3)); }
.final-inner p { font-size: 1.12rem; color: var(--ink-2); margin-bottom: 8px; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 32px 0; }
.footer-inner { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; }
.footer nav { display: flex; gap: 22px; font-size: .92rem; color: var(--ink-2); }
.footer nav a:hover { color: var(--ink); }
.footer .small { margin-left: auto; }

/* Terms page */
.legal { padding: 64px 0 96px; }
.legal h1 { font-size: clamp(2.2rem, 4vw, 3rem); margin: 8px 0 6px; }
.legal .updated { color: var(--muted); margin-bottom: 40px; }
.legal h2 { font-size: 1.3rem; letter-spacing: -.02em; margin: 36px 0 10px; }
.legal p, .legal li { color: var(--ink-2); }
.legal ul { padding-left: 22px; margin-top: 8px; }
.legal li { margin-bottom: 6px; }
.legal a { color: var(--blue); }
.legal .box { background: var(--tint); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; margin-top: 12px; }

/* Responsive */
@media (max-width: 1020px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .setup-grid { grid-template-columns: repeat(2, 1fr); }
  .story { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-inner .btn { margin-left: auto; }
  .hero { padding: 48px 0 72px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .fc-timer { left: 10px; top: -20px; }
  .fc-break { right: 10px; bottom: -20px; }
  .steps { grid-template-columns: 1fr 1fr; row-gap: 40px; }
  .steps::before { display: none; }
  .two-col { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .footer .small { margin-left: 0; }
}
@media (max-width: 520px) {
  .features, .setup-grid, .steps { grid-template-columns: 1fr; }
  .card, .story-quote { padding: 28px; }
  .btn-lg { width: 100%; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}
html, body { overflow-x: hidden; }
.hero-inner > *, .story > *, .two-col > * { min-width: 0; }
/* Language menu */
.lang-menu { position: relative; }
.nav-links + .lang-menu { margin-left: -8px; }
.lang-menu summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 5px;
  font-size: .8rem; font-weight: 600; letter-spacing: .04em; color: var(--muted);
  padding: 6px 9px; border-radius: 9px; transition: color .15s, background .15s;
}
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu summary:hover, .lang-menu[open] summary { color: var(--ink); background: var(--tint); }
.lang-list {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 160px; padding: 6px;
  background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg);
  display: grid; z-index: 60;
}
.lang-list a { padding: 8px 12px; border-radius: 8px; font-size: .9rem; color: var(--ink-2); }
.lang-list a:hover { background: var(--tint); color: var(--ink); }
.lang-list a[aria-current] { color: var(--blue); font-weight: 600; }
@media (max-width: 860px) { .nav-inner .lang-menu { margin-left: auto; } .nav-inner .lang-menu + .btn { margin-left: 0; } }

/* CJK: no negative tracking on headings */
:lang(zh) h1, :lang(zh) h2, :lang(ja) h1, :lang(ja) h2 { letter-spacing: -.01em; line-height: 1.2; }
:lang(el) h1, :lang(ru) h1, :lang(de) h1, :lang(fr) h1, :lang(es) h1, :lang(it) h1, :lang(pt) h1 { font-size: clamp(2.3rem, 4.4vw, 3.6rem); }