/* Yingfangyi Intelligent Tech official website */

:root {
  --c-ink: #18211f;
  --c-ink-soft: #4e5b57;
  --c-muted: #73817c;
  --c-line: #dce3df;
  --c-line-soft: #eef2ef;
  --c-paper: #ffffff;
  --c-canvas: #f6f8f5;
  --c-mist: #eaf1ed;
  --c-primary: #1a3a6c;
  --c-primary-dark: #10254a;
  --c-primary-soft: #dde6f2;
  --c-accent: #c0842f;
  --c-accent-soft: #f5ead8;
  --c-deep: #10213f;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --max-width: 1160px;
  --max-width-narrow: 860px;
  --radius-sm: 6px;
  --radius: 8px;
  --shadow: 0 20px 50px rgba(16, 39, 36, 0.10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--c-ink);
  background:
    linear-gradient(180deg, #fbfcfa 0, var(--c-canvas) 420px, #fff 100%);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-dark); text-decoration: underline; }
h1, h2, h3, h4 {
  color: var(--c-ink);
  line-height: 1.18;
  margin-top: 0;
  letter-spacing: 0;
}
h1 { font-size: clamp(2.15rem, 4vw, 4.25rem); margin-bottom: 1rem; font-weight: 760; }
h2 { font-size: clamp(1.55rem, 2.5vw, 2.35rem); margin: 3.25rem 0 1rem; font-weight: 720; }
h3 { font-size: 1.12rem; margin: 1.3rem 0 0.65rem; font-weight: 700; }
h4 { font-size: 1rem; margin: 1rem 0 0.5rem; font-weight: 700; }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.35rem; }
li { margin-bottom: 0.45rem; }
strong { color: var(--c-ink); }
code {
  font-family: var(--font-mono);
  background: var(--c-mist);
  padding: 0.14rem 0.38rem;
  border-radius: 4px;
  font-size: 0.92em;
}
hr { border: 0; border-top: 1px solid var(--c-line); margin: 2.5rem 0; }

.container,
.container-narrow {
  width: min(100% - 3rem, var(--max-width));
  margin: 0 auto;
}
.container-narrow { max-width: var(--max-width-narrow); }
main { padding: 3.5rem 0 4rem; }
main .container > section,
main .container-narrow > section { margin-bottom: 2.7rem; }
.text-center { text-align: center; }
.text-muted { color: var(--c-muted); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 252, 250, 0.9);
  border-bottom: 1px solid rgba(220, 227, 223, 0.78);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
}
.header-inner {
  width: min(100% - 3rem, var(--max-width));
  margin: 0 auto;
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--c-ink);
  font-weight: 750;
  line-height: 1.2;
  min-width: 190px;
}
.logo:hover { text-decoration: none; color: var(--c-ink); }
.logo-mark {
  min-width: 42px;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  flex: 0 0 auto;
  background-image: url("logo-mark.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  font-size: 0;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  flex-wrap: wrap;
}
.nav a {
  color: var(--c-ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
  padding: 0.52rem 0.62rem;
  border-radius: var(--radius-sm);
}
.nav a.active,
.nav a:hover {
  color: var(--c-primary-dark);
  background: var(--c-primary-soft);
  text-decoration: none;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: #fff;
  margin-left: 0.25rem;
}
.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--c-muted);
  border-radius: 4px;
  padding: 0.38rem 0.7rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
}
.lang-switch button.active {
  background: var(--c-deep);
  color: #fff;
}

.hero {
  position: relative;
  isolation: isolate;
  min-height: 620px;
  display: flex;
  align-items: end;
  padding: 6rem 1.5rem 4.2rem;
  overflow: hidden;
  background: var(--c-deep);
}
.hero-image {
  background-image:
    linear-gradient(90deg, rgba(7, 26, 23, 0.88) 0%, rgba(7, 26, 23, 0.70) 46%, rgba(7, 26, 23, 0.34) 100%),
    url("img/contact-strip.jpg");
  background-size: cover;
  background-position: center;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 36%;
  z-index: -1;
  background: linear-gradient(180deg, rgba(16, 39, 36, 0), rgba(16, 39, 36, 0.72));
}
.hero-inner {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  color: #fff;
}
.hero .badge,
.eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  color: var(--c-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.85rem;
}
.hero h1 {
  max-width: 850px;
  color: #fff;
  text-wrap: balance;
}
.hero p {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  margin-bottom: 1.75rem;
}
.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.68rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: 750;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--c-primary-dark); color: #fff; }
.btn-secondary {
  background: #fff;
  border-color: var(--c-line);
  color: var(--c-primary-dark);
}
.btn-secondary:hover { border-color: var(--c-primary); color: var(--c-primary-dark); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.42);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.16); color: #fff; }
.btn-lg { min-height: 48px; padding: 0.82rem 1.25rem; }

.section-head {
  max-width: 780px;
  margin: 0 0 1.8rem;
}
.section-head h2 { margin: 0 0 0.65rem; }
.section-head p {
  color: var(--c-muted);
  font-size: 1.04rem;
}

.info-grid,
.grid,
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.info-card,
.card,
.plan {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: 0 1px 0 rgba(16, 39, 36, 0.03);
}
.info-card h3,
.card h3 {
  margin-top: 0;
  color: var(--c-ink);
}
.info-card p,
.card p { color: var(--c-ink-soft); margin-bottom: 0; }
.plan-name {
  display: inline-block;
  color: var(--c-primary);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.55rem;
}
.plan h3 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}
.plan-desc {
  color: var(--c-ink-soft);
  margin-bottom: 0;
}
.plan.is-featured {
  border-color: rgba(15, 111, 92, 0.35);
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, #fff 0, var(--c-primary-soft) 100%);
}
.info-card.with-image,
.card.with-image { padding: 0; overflow: hidden; }
.info-card.with-image h3,
.info-card.with-image p { padding-left: 1.25rem; padding-right: 1.25rem; }
.info-card.with-image p { padding-bottom: 1.25rem; }
.card-image {
  display: block;
  min-height: 190px;
  background-size: cover;
  background-position: center;
}
.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: -1.8rem auto 3.2rem;
  position: relative;
  z-index: 2;
  box-shadow: var(--shadow);
}
.metric {
  background: #fff;
  padding: 1.2rem 1.35rem;
}
.metric strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.2;
}
.metric span {
  color: var(--c-muted);
  font-size: 0.92rem;
}
.feature-band {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
  background: var(--c-mist);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  margin: 2rem 0;
}
.feature-band img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-sm);
}
.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0;
  margin: 1.25rem 0 0;
  list-style: none;
}
.pill-list li {
  margin: 0;
  padding: 0.42rem 0.72rem;
  border: 1px solid rgba(15, 111, 92, 0.24);
  border-radius: var(--radius-sm);
  color: var(--c-primary-dark);
  background: rgba(255, 255, 255, 0.68);
  font-weight: 700;
  font-size: 0.9rem;
}

.media-row {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1.2rem, 3vw, 2.5rem);
  align-items: center;
  margin: 1.4rem 0;
}
.media-row.reverse { grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr); }
.media-row.reverse .media-row-image { order: 2; }
.media-row-image,
.page-strip {
  min-height: 290px;
  border-radius: var(--radius);
  background-size: cover;
  background-position: center;
  box-shadow: var(--shadow);
}
.media-row-text {
  background: #fff;
  border-left: 3px solid var(--c-accent);
  padding: 1.15rem 0 1.15rem 1.35rem;
}
.page-strip {
  width: min(100% - 3rem, var(--max-width));
  margin: 0 auto 2rem;
  min-height: 250px;
}

.kv-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.kv-table th,
.kv-table td {
  text-align: left;
  padding: 0.92rem 1rem;
  border-bottom: 1px solid var(--c-line-soft);
  vertical-align: top;
}
.kv-table tr:last-child th,
.kv-table tr:last-child td { border-bottom: 0; }
.kv-table th {
  width: 31%;
  background: var(--c-canvas);
  color: var(--c-ink);
  font-weight: 750;
}
.kv-table td { color: var(--c-ink-soft); }

.callout,
.notice {
  background: var(--c-accent-soft);
  border: 1px solid rgba(192, 132, 47, 0.28);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin: 1.5rem 0;
}
.callout-info { background: var(--c-primary-soft); border-left-color: var(--c-primary); }
.callout-warn { background: #fff5df; border-left-color: var(--c-accent); }

.legal h2 {
  font-size: 1.35rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--c-line);
}

.cta-band {
  background: var(--c-deep);
  color: #fff;
  border-radius: var(--radius);
  padding: clamp(1.7rem, 4vw, 3rem);
  margin: 3rem 0 1rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.2rem;
  align-items: center;
}
.cta-band h2 { color: #fff; margin: 0 0 0.55rem; }
.cta-band p { color: rgba(255, 255, 255, 0.78); max-width: 680px; margin-bottom: 0; }

.site-footer {
  background: var(--c-deep);
  color: rgba(255, 255, 255, 0.72);
  padding: 2.5rem 1.5rem;
  font-size: 0.93rem;
  margin-top: 2rem;
}
.footer-inner {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}
.footer-inner strong { color: #fff; }
.footer-col,
.footer-bottom,
.footer-brand { color: inherit; }

[data-lang="zh"] .lang-en,
[data-lang="en"] .lang-zh { display: none; }

@media (max-width: 920px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.8rem 0;
    gap: 0.75rem;
  }
  .nav {
    justify-content: flex-start;
    width: 100%;
  }
  .hero { min-height: 560px; }
  .feature-band,
  .media-row,
  .media-row.reverse,
  .cta-band {
    grid-template-columns: 1fr;
  }
  .media-row.reverse .media-row-image { order: 0; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .container,
  .container-narrow,
  .header-inner,
  .page-strip {
    width: min(100% - 2rem, var(--max-width));
  }
  main { padding: 2.5rem 0 3rem; }
  .logo { min-width: 0; font-size: 0.98rem; }
  .logo-mark { min-width: 38px; width: 38px; height: 38px; }
  .nav { gap: 0.25rem; }
  .nav a { padding: 0.42rem 0.52rem; font-size: 0.88rem; }
  .lang-switch { margin-left: 0; }
  .hero {
    min-height: 540px;
    padding: 4.8rem 1rem 3rem;
  }
  .hero-image {
    background-position: 58% center;
  }
  .hero-actions .btn { width: 100%; }
  .metric-row { grid-template-columns: 1fr; margin-top: -1.2rem; }
  .info-grid,
  .grid,
  .plans-grid { grid-template-columns: 1fr; }
  .media-row-image,
  .page-strip { min-height: 210px; }
  .media-row-text {
    border-left: 0;
    border-top: 3px solid var(--c-accent);
    padding: 1rem 0 0;
  }
  .kv-table,
  .kv-table tbody,
  .kv-table tr,
  .kv-table th,
  .kv-table td {
    display: block;
    width: 100%;
  }
  .kv-table th { border-bottom: 0; padding-bottom: 0.35rem; }
  .kv-table td { padding-top: 0.35rem; }
}