/* ============================================================================
   Shenji Bailian · English site shared stylesheet
   ----------------------------------------------------------------------------
   Scope: /en/ (4 static pages). Visual language is inherited from the Chinese
   production site: deep near-black teal ground, single cyan accent, hard 90°
   corners everywhere, no gradients of the purple kind, no rounded "SaaS card".

   Hard rules baked in here (see _spec ADR-1 / A-01):
     · system font stack only — no Google Fonts (unreachable from mainland and
       the Noto Sans SC subset is far too heavy)
     · --radius is intentionally absent; every corner stays square
     · no third-party brand colours, no logo assets copied in
   ========================================================================== */

:root {
  --bg: #011012;
  --bg-soft: #07161a;
  --panel: #0b1c20;
  --fg: #eef7f8;
  --body: #c9d9dd;
  --mut: #93a8ad;
  --cy: #12e3e3;
  --cy-soft: rgba(18, 227, 227, 0.1);
  --cy-line: rgba(18, 227, 227, 0.34);
  --bd: rgba(255, 255, 255, 0.12);
  --bd-soft: rgba(255, 255, 255, 0.07);
  --w: 1120px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* Sticky nav is 64px tall; anchor targets must clear it. */
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--cy);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--cy);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 24px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--cy);
  color: #001416;
  padding: 10px 16px;
  z-index: 99;
}

.skip:focus {
  left: 8px;
  top: 8px;
}

/* ---------------------------------------------------------------- language */
/* Text-only switcher. No flags: a flag denotes a country, not a language. */
.lang {
  display: inline-flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--bd);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1;
}

.lang a,
.lang span {
  padding: 7px 10px;
  display: inline-block;
  color: var(--mut);
}

.lang .on {
  background: var(--cy-soft);
  color: var(--cy);
  font-weight: 700;
}

.lang a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  text-decoration: none;
}

/* --------------------------------------------------------------------- nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(1, 16, 18, 0.92);
  border-bottom: 1px solid var(--bd);
  backdrop-filter: blur(8px);
}

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 64px;
  flex-wrap: wrap;
}

.nav .brand {
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--cy);
  font-size: 14px;
  margin: 0;
  white-space: nowrap;
}

.nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13.5px;
}

.nav ul a {
  color: #cfe0e4;
}

.nav .nav-end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

/* -------------------------------------------------------------------- hero */
.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--bd-soft);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: start;
}

.eyebrow {
  display: inline-block;
  border: 1px solid var(--cy-line);
  background: var(--cy-soft);
  color: #b9f4f8;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 7px 12px;
  margin: 0 0 26px;
}

h1 {
  font-size: clamp(2.15rem, 4.6vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 650;
  margin: 0 0 22px;
  overflow-wrap: anywhere;
}

h1 .hl {
  color: var(--cy);
}

.lede {
  font-size: 17.5px;
  line-height: 1.7;
  color: var(--body);
  margin: 0 0 30px;
  max-width: 46em;
}

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

.btn {
  display: inline-block;
  padding: 13px 24px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.btn-solid {
  background: #fff;
  color: #05171a;
}

.btn-solid:hover {
  background: #b9f4f8;
  color: #05171a;
  text-decoration: none;
}

.btn-ghost {
  border-color: var(--cy-line);
  background: var(--cy-soft);
  color: #c9f7fa;
}

.btn-ghost:hover {
  background: rgba(18, 227, 227, 0.2);
  color: #fff;
  text-decoration: none;
}

/* hero side panel ---------------------------------------------------------- */
.facts {
  border: 1px solid var(--bd);
  background: var(--panel);
  padding: 26px;
}

.facts .cap {
  font-size: 11.5px;
  letter-spacing: 0.28em;
  color: var(--cy);
  text-transform: uppercase;
  margin: 0 0 20px;
}

.facts dl {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--bd-soft);
}

.facts dl > div {
  background: var(--panel);
  padding: 16px;
}

.facts dt {
  font-size: 26px;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--cy);
  line-height: 1.2;
}

.facts dd {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mut);
}

/* ----------------------------------------------------------------- section */
section {
  padding: 64px 0;
}

section + section {
  border-top: 1px solid var(--bd-soft);
}

.kicker {
  font-size: 11.5px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cy);
  margin: 0 0 14px;
}

h2 {
  font-size: clamp(1.6rem, 2.9vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.028em;
  font-weight: 650;
  margin: 0 0 16px;
  max-width: 24em;
}

h3 {
  font-size: 1.12rem;
  line-height: 1.35;
  font-weight: 650;
  margin: 0 0 10px;
}

.sub {
  color: var(--body);
  font-size: 16px;
  max-width: 52em;
  margin: 0 0 34px;
}

p {
  color: var(--body);
  margin: 0 0 16px;
}

strong {
  color: #fff;
  font-weight: 600;
}

/* ------------------------------------------------------------------- cards */
.grid {
  display: grid;
  gap: 20px;
}

.g3 {
  grid-template-columns: repeat(3, 1fr);
}

.g2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  border: 1px solid var(--bd);
  background: var(--bg-soft);
  padding: 26px;
}

.card .n {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cy);
  display: block;
  margin-bottom: 14px;
}

.card h3 + p:last-child,
.card p:last-child {
  margin-bottom: 0;
}

.card .val {
  display: inline-block;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #b9f4f8;
  border-top: 1px solid var(--cy-line);
  padding-top: 10px;
}

.tags {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags li {
  font-size: 12px;
  color: var(--mut);
  border: 1px solid var(--bd);
  padding: 4px 9px;
}

/* ---------------------------------------------------------------- evidence */
.evidence {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--bd-soft);
  border: 1px solid var(--bd);
}

.evidence > div {
  background: var(--bg-soft);
  padding: 24px 22px;
}

.evidence .big {
  font-size: 30px;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--cy);
  line-height: 1.1;
}

.evidence p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mut);
}

/* ------------------------------------------------------------------- table */
.tablewrap {
  overflow-x: auto;
  border: 1px solid var(--bd);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}

table caption {
  caption-side: top;
  text-align: left;
  padding: 13px 16px;
  font-size: 12.5px;
  color: var(--mut);
  border-bottom: 1px solid var(--bd-soft);
}

th,
td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--bd-soft);
  vertical-align: top;
}

thead th {
  background: rgba(18, 227, 227, 0.07);
  color: #d8fbfd;
  font-weight: 650;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

tbody tr:last-child td {
  border-bottom: 0;
}

td .num {
  color: var(--cy);
  font-weight: 650;
}

/* --------------------------------------------------------------------- faq */
.faq details {
  border: 1px solid var(--bd);
  background: var(--bg-soft);
  margin-bottom: 10px;
}

.faq summary {
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--fg);
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before {
  content: "+";
  color: var(--cy);
  margin-right: 12px;
  font-weight: 700;
}

.faq details[open] summary::before {
  content: "–";
}

.faq .a {
  padding: 0 20px 18px 44px;
  font-size: 14.5px;
  color: var(--body);
}

.faq .a p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------- cta */
.cta {
  border: 1px solid var(--cy-line);
  background: linear-gradient(180deg, rgba(18, 227, 227, 0.07), transparent);
  padding: 44px 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
}

.cta h2 {
  margin: 0 0 8px;
  max-width: 20em;
}

.cta p {
  margin: 0;
  font-size: 14.5px;
  color: var(--mut);
  max-width: 44em;
}

/* ------------------------------------------------------------------ figure */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--bd);
}

figcaption {
  font-size: 12.5px;
  color: var(--mut);
  margin-top: 10px;
  line-height: 1.6;
}

/* --------------------------------------------------------------- breadcrumb */
.crumb {
  font-size: 12.5px;
  color: var(--mut);
  padding: 18px 0 0;
}

.crumb a {
  color: var(--mut);
}

.crumb a:hover {
  color: var(--cy);
}

/* ------------------------------------------------------------------ footer */
.foot {
  border-top: 1px solid var(--bd);
  background: var(--bg-soft);
  padding: 48px 0 24px;
  font-size: 13.5px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
}

.foot h3 {
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mut);
  margin: 0 0 14px;
  font-weight: 700;
}

.foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot li {
  margin-bottom: 9px;
}

.foot a {
  color: #bcd7dd;
}

.foot address {
  font-style: normal;
  color: var(--mut);
  line-height: 1.8;
}

/* The ICP filing number must appear verbatim on every page. The build-time
   guard (scripts/check_en_terms.py) fails the build if it goes missing. */
.beian {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--bd-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  font-size: 12.5px;
  color: var(--mut);
}

.beian a {
  color: #9fc4cb;
}

/* ---------------------------------------------------------------- responsive */
@media (max-width: 940px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .g3,
  .evidence,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .g2 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 52px 0 40px;
  }

  section {
    padding: 48px 0;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15.5px;
  }

  .wrap {
    padding: 0 18px;
  }

  .nav .wrap {
    gap: 10px 14px;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .nav ul {
    gap: 12px;
    font-size: 12.5px;
  }

  .nav .nav-end {
    margin-left: 0;
    width: 100%;
  }

  h1 {
    font-size: clamp(1.9rem, 8.4vw, 2.5rem);
  }

  .lede {
    font-size: 16px;
  }

  .facts dl {
    grid-template-columns: 1fr 1fr;
  }

  .cta {
    padding: 30px 22px;
  }

  .card,
  .facts {
    padding: 20px;
  }

  .actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
    animation: none !important;
  }
}