/* ============================================
   YSZY Tech — Corporate Website Stylesheet
   Guangzhou Yunshen Zhiyuan Technology Co., Ltd.
   ============================================ */

:root {
  /* Brand palette — deep navy + cyan accent (enterprise SaaS) */
  --navy-900: #061a2e;
  --navy-800: #0a2540;
  --navy-700: #123a5c;
  --navy-600: #1b4f7a;
  --cyan-500: #00a3bf;
  --cyan-400: #22b8d4;
  --cyan-300: #6fd3e6;
  --cyan-50: #eaf8fb;
  --ink-900: #0d1b2a;
  --ink-700: #33475b;
  --ink-500: #5f7387;
  --ink-300: #9aacbd;
  --line: #e3eaf1;
  --bg-soft: #f6f9fc;
  --white: #ffffff;
  --success: #12a67a;

  --container: 1180px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(13, 27, 42, .06), 0 2px 8px rgba(13, 27, 42, .05);
  --shadow-md: 0 4px 16px rgba(13, 27, 42, .08), 0 12px 32px rgba(13, 27, 42, .06);
  --shadow-lg: 0 18px 48px rgba(6, 26, 46, .16);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --t: .2s cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--cyan-500); text-decoration: none; transition: color var(--t); }
a:hover { color: var(--navy-700); }

h1, h2, h3, h4 {
  color: var(--ink-900);
  line-height: 1.25;
  margin: 0 0 .6em;
  font-weight: 700;
  letter-spacing: -.02em;
}

h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.15rem); }
h3 { font-size: 1.2rem; }
p  { margin: 0 0 1.1em; }

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

/* ---------- Language switching ---------- */
/* Bilingual blocks: <div data-lang="zh">…</div> / <div data-lang="en">…</div> */
[data-lang] { display: none; }
html[lang="zh-CN"] [data-lang="zh"] { display: revert; }
html[lang="en"]    [data-lang="en"] { display: revert; }
/* inline variant (spans inside flowing text) */
html[lang="zh-CN"] span[data-lang="zh"] { display: inline; }
html[lang="en"]    span[data-lang="en"] { display: inline; }
/* list-item variant */
html[lang="zh-CN"] li[data-lang="zh"] { display: list-item; }
html[lang="en"]    li[data-lang="en"] { display: list-item; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; height: 68px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; color: var(--ink-900); font-size: 1.16rem; letter-spacing: -.03em; }
.brand:hover { color: var(--navy-800); }
.brand-mark {
  width: 34px; height: 34px; flex: 0 0 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--navy-800), var(--cyan-500));
  display: grid; place-items: center;
  color: #fff; font-size: .82rem; font-weight: 800; letter-spacing: .02em;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { font-size: .68rem; font-weight: 500; color: var(--ink-500); letter-spacing: 0; }

.main-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  color: var(--ink-700); font-size: .94rem; font-weight: 500;
}
.main-nav a:hover { background: var(--bg-soft); color: var(--navy-800); }
.main-nav a.active { color: var(--navy-800); font-weight: 600; }

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

.lang-switch {
  display: flex; align-items: center;
  border: 1px solid var(--line); border-radius: 999px;
  overflow: hidden; background: var(--white);
}
.lang-switch button {
  border: 0; background: transparent; cursor: pointer;
  padding: 6px 13px; font-size: .82rem; font-weight: 600;
  color: var(--ink-500); font-family: var(--font);
  transition: var(--t);
}
.lang-switch button:hover { color: var(--navy-800); }
.lang-switch button.active { background: var(--navy-800); color: #fff; }

.nav-toggle { display: none; border: 1px solid var(--line); background: var(--white); border-radius: var(--radius-sm); width: 40px; height: 38px; cursor: pointer; font-size: 1.1rem; line-height: 1; color: var(--ink-700); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius-sm);
  font-size: .95rem; font-weight: 600; font-family: var(--font);
  border: 1px solid transparent; cursor: pointer;
  transition: var(--t); white-space: nowrap;
}
.btn-primary { background: var(--navy-800); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--navy-700); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-accent { background: var(--cyan-500); color: #fff; }
.btn-accent:hover { background: var(--cyan-400); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: var(--white); color: var(--navy-800); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--cyan-300); color: var(--navy-800); background: var(--cyan-50); }
.btn-sm { padding: 9px 16px; font-size: .88rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1000px 480px at 78% -8%, rgba(0, 163, 191, .16), transparent 62%),
    radial-gradient(760px 420px at 6% 108%, rgba(18, 58, 92, .1), transparent 60%),
    linear-gradient(180deg, #fbfdff 0%, #f4f9fc 100%);
  border-bottom: 1px solid var(--line);
  padding: 84px 0 76px;
}
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 56px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--cyan-50); color: var(--navy-700);
  font-size: .8rem; font-weight: 600; letter-spacing: .01em;
  border: 1px solid rgba(0, 163, 191, .2);
  margin-bottom: 20px;
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan-500); }
.hero h1 { margin-bottom: .5em; }
.hero h1 .accent { color: var(--cyan-500); }
.hero-lead { font-size: 1.1rem; color: var(--ink-500); max-width: 34em; margin-bottom: 30px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 22px; padding-top: 22px; border-top: 1px solid var(--line); }
.hero-trust-item { display: flex; flex-direction: column; }
.hero-trust-item strong { font-size: 1.35rem; color: var(--navy-800); font-weight: 800; letter-spacing: -.03em; }
.hero-trust-item span { font-size: .82rem; color: var(--ink-500); }

/* Hero visual — dashboard mock */
.hero-visual { position: relative; }
.dash {
  background: var(--white); border: 1px solid var(--line);
  border-radius: 16px; box-shadow: var(--shadow-lg); overflow: hidden;
}
.dash-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: var(--navy-900); }
.dash-bar i { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.28); display: block; }
.dash-bar span { margin-left: 8px; font-size: .74rem; color: rgba(255,255,255,.62); font-family: var(--mono); }
.dash-body { padding: 18px; }
.dash-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.kpi { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px; }
.kpi b { display: block; font-size: 1.06rem; color: var(--navy-800); font-weight: 700; }
.kpi span { font-size: .7rem; color: var(--ink-500); }
.kpi .up { color: var(--success); font-size: .7rem; font-weight: 600; }
.dash-chart { display: flex; align-items: flex-end; gap: 7px; height: 96px; padding: 12px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.dash-chart i { flex: 1; background: linear-gradient(180deg, var(--cyan-400), var(--navy-600)); border-radius: 4px 4px 0 0; display: block; }
.dash-rows { margin-top: 14px; display: grid; gap: 8px; }
.dash-row { display: flex; align-items: center; gap: 10px; font-size: .78rem; color: var(--ink-500); }
.dash-row .tag { font-size: .68rem; padding: 2px 8px; border-radius: 999px; background: var(--cyan-50); color: var(--navy-700); font-weight: 600; }
.dash-row .bar { flex: 1; height: 6px; border-radius: 999px; background: var(--line); overflow: hidden; }
.dash-row .bar i { display: block; height: 100%; background: var(--cyan-500); }

/* ---------- Sections ---------- */
.section { padding: 78px 0; }
.section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 44em; margin-bottom: 42px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { margin-bottom: .5em; }
.section-head p { color: var(--ink-500); font-size: 1.03rem; margin: 0; }
.section-label {
  display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--cyan-500); margin-bottom: 12px;
}

/* Cards */
.card-grid { display: grid; gap: 20px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px;
  transition: var(--t); height: 100%;
}
.card:hover { border-color: var(--cyan-300); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card h3 { font-size: 1.06rem; margin-bottom: .5em; }
.card p { font-size: .92rem; color: var(--ink-500); margin: 0; }
.card-icon {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--cyan-50); color: var(--navy-700);
  display: grid; place-items: center; margin-bottom: 16px;
  border: 1px solid rgba(0, 163, 191, .18);
}
.card-icon svg { width: 21px; height: 21px; }

/* Feature list */
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li { position: relative; padding-left: 28px; margin-bottom: 12px; font-size: .94rem; color: var(--ink-700); }
.feature-list li::before {
  content: ""; position: absolute; left: 0; top: .52em;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--cyan-50) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2300a3bf' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/11px no-repeat;
  border: 1px solid rgba(0, 163, 191, .25);
}

/* Split layout */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; }
.split.reverse .split-media { order: -1; }

/* Steps */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step { position: relative; padding: 22px 24px 22px 66px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 22px; top: 21px;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--navy-800); color: #fff;
  display: grid; place-items: center; font-size: .84rem; font-weight: 700;
}
.step h3 { font-size: 1rem; margin-bottom: .35em; }
.step p { font-size: .9rem; color: var(--ink-500); margin: 0; }

/* Table */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
table.data { width: 100%; border-collapse: collapse; font-size: .92rem; }
table.data th, table.data td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
table.data th { background: var(--bg-soft); font-weight: 600; color: var(--ink-900); font-size: .86rem; white-space: nowrap; }
table.data tr:last-child td { border-bottom: 0; }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 55%, var(--cyan-500) 190%);
  color: #fff; border-radius: 18px; padding: 52px 48px;
  display: flex; align-items: center; justify-content: space-between; gap: 36px; flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta-band h2 { color: #fff; margin-bottom: .35em; }
.cta-band p { color: rgba(255,255,255,.78); margin: 0; max-width: 34em; }
.cta-band .btn-accent { background: #fff; color: var(--navy-800); }
.cta-band .btn-accent:hover { background: var(--cyan-50); color: var(--navy-800); }

/* Page hero (interior pages) */
.page-hero { background: linear-gradient(180deg, #fbfdff, #f2f8fb); border-bottom: 1px solid var(--line); padding: 56px 0 48px; }
.page-hero h1 { margin-bottom: .35em; }
.page-hero p { color: var(--ink-500); font-size: 1.05rem; max-width: 46em; margin: 0; }
.breadcrumb { font-size: .84rem; color: var(--ink-300); margin-bottom: 14px; }
.breadcrumb a { color: var(--ink-500); }
.breadcrumb a:hover { color: var(--cyan-500); }

/* Legal / prose */
.prose { max-width: 60em; }
.prose h2 { font-size: 1.32rem; margin-top: 2.1em; padding-top: 1.3em; border-top: 1px solid var(--line); }
.prose h2:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.prose h3 { font-size: 1.05rem; margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.35em; margin: 0 0 1.2em; }
.prose li { margin-bottom: .5em; }
.prose .meta { font-size: .86rem; color: var(--ink-500); background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 18px; }
.prose strong { color: var(--ink-900); }

/* Info blocks */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.info-item { padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.info-item .label { font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-300); font-weight: 600; margin-bottom: 6px; }
.info-item .value { color: var(--ink-900); font-weight: 600; font-size: .96rem; word-break: break-word; }
.info-item .value a { color: var(--cyan-500); }

/* Contact card */
.contact-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 40px; }
.contact-card { text-align: center; padding: 30px 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.contact-card .card-icon { margin: 0 auto 14px; }
.contact-card h3 { font-size: 1rem; margin-bottom: .3em; }
.contact-card p { font-size: .9rem; color: var(--ink-500); margin: 0; }
.contact-card a { font-weight: 600; }

/* Footer */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.68); padding: 58px 0 26px; font-size: .9rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 38px; padding-bottom: 38px; border-bottom: 1px solid rgba(255,255,255,.1); }
.site-footer h4 { color: #fff; font-size: .84rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 1.1em; font-weight: 700; }
.site-footer a { color: rgba(255,255,255,.68); }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .6em; }
.footer-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 16px; color: #fff; font-weight: 700; font-size: 1.05rem; }
.footer-brand .brand-mark { background: linear-gradient(135deg, var(--cyan-500), var(--navy-600)); }
.footer-legal { padding-top: 22px; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: .82rem; color: rgba(255,255,255,.45); }
.footer-legal a { color: rgba(255,255,255,.6); }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero-grid, .split { grid-template-columns: 1fr; gap: 38px; }
  .split.reverse .split-media { order: 0; }
  .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cols-3 { grid-template-columns: repeat(2, 1fr); }
  .contact-cards { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .cta-band { padding: 40px 32px; }
}
@media (max-width: 720px) {
  .header-inner { height: 62px; }
  .main-nav {
    display: none; position: absolute; left: 0; right: 0; top: 62px;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--white); border-bottom: 1px solid var(--line);
    padding: 12px 18px 18px; box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 11px 14px; }
  .nav-toggle { display: block; }
  .brand-text small { display: none; }
  .section { padding: 56px 0; }
  .hero { padding: 56px 0 52px; }
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .dash-kpis { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 34px 26px; }
  .cta-band .btn-accent { width: 100%; }
}
@media print {
  .site-header, .site-footer, .cta-band, .nav-toggle { display: none; }
}