/* ==========================================================================
   河南乐奕云科技 · 官网
   排版：一套中文字体栈；等宽只用于纯数字 / 英文技术标签
   ========================================================================== */

:root {
  --bg: #070809;
  --bg-2: #0a0c0e;
  --panel: #0d1012;
  --line: #1c2024;
  --line-2: #16191c;

  --text: #eceff2;
  --text-2: #b9c0c7;
  --muted: #838c96;
  --dim: #5b646e;

  --accent: #45c9a8;

  --font: "MiSans", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans SC",
          "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas,
          "Microsoft YaHei", "Liberation Mono", monospace;

  --radius: 2px;
  --maxw: 1180px;
  --gutter: 40px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.35;
}

::selection { background: rgba(69, 201, 168, 0.22); color: #fff; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 8, 9, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand svg { display: block; flex-shrink: 0; }
.brand > span { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-size: 16px; font-weight: 600; letter-spacing: 0.01em; }
.brand-en {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.14em;
  color: var(--dim);
  margin-top: 3px;
}

.nav { display: flex; align-items: center; gap: 32px; }
.nav a {
  font-size: 14px;
  color: var(--muted);
  transition: color 0.18s ease;
}
.nav a:hover { color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 18px; }
.header-tel {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #04120e; }
.btn-primary:hover { background: #57d9b8; }
.btn-ghost { border-color: #2a3138; color: var(--text-2); }
.btn-ghost:hover { border-color: #3d4650; color: var(--text); }
.btn-sm { padding: 8px 16px; font-size: 13px; }

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: var(--radius);
  position: relative;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 16px;
  height: 1px;
  background: var(--text-2);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle span { top: 18px; }
.nav-toggle span::before { top: -5px; left: 0; }
.nav-toggle span::after { top: 5px; left: 0; }

/* ---------- 小标签 ---------- */
.eyebrow {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.02em;
}
.eyebrow .num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.eyebrow .bar { display: none; }

.kicker {
  display: inline-block;
  font-size: 13px;
  color: var(--muted);
  padding-left: 14px;
  position: relative;
}
.kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--accent);
}
.badge { display: none; }

.section { padding: 104px 0; border-top: 1px solid var(--line-2); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 56px;
  margin-bottom: 52px;
}
.section-head h2 {
  font-size: clamp(24px, 2.6vw, 34px);
  margin-top: 18px;
  font-weight: 600;
}
.section-head .desc {
  max-width: 380px;
  font-size: 14px;
  line-height: 1.95;
  color: var(--muted);
  text-align: right;
  flex-shrink: 0;
}

/* ---------- 首屏 ---------- */
.hero {
  padding: 96px 0 56px;
  border-bottom: 1px solid var(--line-2);
}
.hero::before,
.hero::after { display: none; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: 64px;
}

.hero h1 {
  font-size: clamp(30px, 3.5vw, 46px);
  line-height: 1.4;
  font-weight: 600;
  margin: 24px 0 0;
  letter-spacing: 0;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-sub {
  margin-top: 24px;
  max-width: 540px;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--muted);
}

.hero-cta { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #0b0e10;
  aspect-ratio: 4 / 3;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.85) brightness(0.92) contrast(1.05);
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 62%, rgba(7, 8, 9, 0.72));
}
.hero-visual .tag {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 2;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: #97a2ac;
}

.eco {
  margin-top: 64px;
  padding-top: 22px;
  border-top: 1px solid var(--line-2);
  display: flex;
  align-items: center;
  gap: 34px;
  flex-wrap: wrap;
}
.eco .label { font-size: 12px; color: var(--dim); }
.eco span { font-size: 12.5px; color: var(--muted); }

/* ---------- 业务方向：编号列表 ---------- */
.capability-grid { border-top: 1px solid var(--line); }

.cap-card {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) 300px;
  gap: 12px 32px;
  align-items: start;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}
.cap-card .top { display: block; padding-top: 3px; }
.cap-card .top .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.06em;
}
.cap-card .cap-ico { display: none; }

.cap-card h3 {
  grid-column: 2;
  font-size: 19px;
  font-weight: 600;
  margin: 0;
}
.cap-card > p {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 600px;
}
.cap-card .tags {
  grid-column: 3;
  grid-row: 1 / span 2;
  margin: 0;
  padding-top: 2px;
  justify-content: flex-end;
  align-content: start;
}

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: #7c868f;
  border: 1px solid var(--line);
  padding: 4px 9px;
  border-radius: 1px;
  white-space: nowrap;
}

/* ---------- 案例 ---------- */
.case-group + .case-group { margin-top: 64px; }

.group-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 26px;
}
.group-head h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-2);
  white-space: nowrap;
}
.group-head .rule { flex: 1; height: 1px; background: var(--line); }
.group-head .count { font-size: 11.5px; color: var(--dim); white-space: nowrap; }

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 44px 32px;
}

.case-card { display: flex; flex-direction: column; }

.case-card .cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #0b0e10;
  border-radius: var(--radius);
}
.case-card .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) brightness(0.92) contrast(1.06);
  transition: transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1), filter 0.45s ease;
}
.case-card:hover .cover img { transform: scale(1.03); filter: grayscale(0.35) brightness(0.98) contrast(1.05); }
.case-card .cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 58%, rgba(7, 8, 9, 0.45));
}

.case-card .body {
  padding: 18px 0 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
  flex: 1;
}

.case-top { display: flex; align-items: center; gap: 8px; }
.pill { font-size: 11.5px; color: var(--accent); letter-spacing: 0.02em; }
.case-top .kind { font-size: 11.5px; color: var(--dim); }
.case-top .kind::before { content: "·"; margin-right: 8px; color: #333a41; }

.case-card h4 { font-size: 18px; font-weight: 600; color: var(--text); }
.case-card p { font-size: 13.5px; line-height: 1.9; color: var(--muted); }
.case-card .stack {
  font-size: 11px;
  color: #5f6973;
  margin-top: auto;
  padding-top: 8px;
}
.case-card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
  font-size: 12.5px;
  color: var(--text-2);
  transition: color 0.18s ease, gap 0.18s ease;
}
.case-card:hover .more { color: var(--accent); gap: 9px; }

/* 奇数个案例：最后一张横向 */
.case-card--wide {
  grid-column: 1 / -1;
  flex-direction: row;
  gap: 40px;
  align-items: center;
}
.case-card--wide .cover { flex: 0 0 54%; aspect-ratio: 16 / 9; }
.case-card--wide .body { padding: 0; justify-content: center; max-width: 500px; }
.case-card--wide h4 { font-size: 21px; }
.case-card--wide p { font-size: 14px; }

.more-work {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.more-work .label { font-size: 12px; color: var(--dim); margin-bottom: 8px; }
.more-work p { font-size: 12.5px; line-height: 2.05; color: var(--muted); }

/* ---------- 交付流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
}
.step .rule { height: 1px; background: #2b3238; margin-bottom: 18px; }
.step:nth-child(2) .rule { background: #242a30; }
.step:nth-child(3) .rule { background: #1e2328; }
.step:nth-child(4) .rule { background: #181c20; }
.step .snum {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--dim);
  margin-bottom: 12px;
}
.step h3 { font-size: 16px; color: var(--text); }
.step p { margin-top: 12px; font-size: 13px; line-height: 1.9; color: var(--muted); }

.tech {
  margin-top: 56px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.tech .label { font-size: 12px; color: var(--dim); margin-bottom: 14px; }

/* ---------- FAQ ---------- */
.faq-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 96px;
  align-items: start;
}
.faq-layout h2 { font-size: clamp(24px, 2.4vw, 30px); margin-top: 18px; }
.faq-layout .lead { margin-top: 18px; font-size: 14px; line-height: 1.95; color: var(--muted); }
.faq-layout .tel { margin-top: 14px; font-size: 14px; color: var(--accent); }

.faq-item { border-top: 1px solid var(--line); padding: 24px 0; }
.faq-item:first-child { border-top: 0; padding-top: 0; }
.faq-item h3 { font-size: 15.5px; font-weight: 600; color: var(--text); }
.faq-item p { margin-top: 10px; font-size: 13.5px; line-height: 2; color: var(--muted); }

/* ---------- 联系 ---------- */
.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 56px;
  padding: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.cta-panel .left { max-width: 600px; }
.cta-panel h2 { font-size: clamp(21px, 2.2vw, 27px); margin-top: 14px; line-height: 1.5; }
.cta-panel p { margin-top: 12px; font-size: 13.5px; line-height: 1.9; color: var(--muted); }
.cta-panel .right {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  flex-shrink: 0;
}
.cta-panel .tel {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 500;
  color: var(--text);
}
.cta-panel .person { font-size: 12.5px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line-2);
  padding-top: 52px;
  background: #050607;
}
.footer-body {
  display: grid;
  grid-template-columns: 300px repeat(3, auto);
  gap: 64px;
  justify-content: space-between;
  padding-bottom: 36px;
}
.footer-brand .name { display: flex; align-items: center; gap: 10px; font-size: 14.5px; font-weight: 600; color: var(--text-2); }
.footer-brand p { margin-top: 14px; font-size: 12.5px; line-height: 1.95; color: var(--dim); max-width: 300px; }
.footer-col .label { font-size: 11.5px; color: #4a525b; margin-bottom: 12px; }
.footer-col a,
.footer-col span { display: block; font-size: 12.5px; color: var(--muted); line-height: 2.1; transition: color 0.18s ease; }
.footer-col a:hover { color: var(--text); }
.footer-col .accent { color: var(--accent); font-family: var(--mono); }
.footer-bottom {
  border-top: 1px solid #111417;
  padding: 20px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 11.5px;
  color: #4a525b;
}

/* ---------- 案例详情页 ---------- */
.case-hero { padding: 56px 0 0; }
.breadcrumb {
  font-size: 12px;
  color: var(--dim);
  display: flex;
  gap: 10px;
  align-items: center;
}
.breadcrumb a { color: var(--dim); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb i { color: #333a41; font-style: normal; }

.case-hero h1 {
  font-size: clamp(27px, 3.2vw, 40px);
  line-height: 1.4;
  font-weight: 600;
  margin-top: 22px;
  max-width: 860px;
}
.case-hero .tagline {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 700px;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin: 40px 0 0;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.case-meta .k { font-size: 11.5px; color: var(--dim); margin-bottom: 6px; }
.case-meta .v { font-size: 13.5px; color: var(--text-2); line-height: 1.65; }

.case-cover {
  margin-top: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.case-cover img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 8.5;
  filter: grayscale(0.9) brightness(0.94) contrast(1.05);
}

.case-body { padding: 80px 0 0; }
.case-section + .case-section { margin-top: 68px; }
.case-section .eyebrow { margin-bottom: 14px; }
.case-section h2 { font-size: clamp(20px, 2.1vw, 26px); }
.case-section .prose {
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 2.05;
  color: var(--muted);
  max-width: 760px;
}
.case-section .prose + .prose { margin-top: 12px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}
.feature { padding: 26px 28px; background: var(--bg); }
.feature .fi { display: none; }
.feature h3 { font-size: 15.5px; font-weight: 600; color: var(--text); }
.feature p { margin-top: 8px; font-size: 13px; line-height: 1.95; color: var(--muted); }

.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}
.flow-step { padding: 22px; background: var(--bg); }
.flow-step .n {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.flow-step h4 { margin-top: 10px; font-size: 14px; color: var(--text-2); font-weight: 600; }
.flow-step p { margin-top: 6px; font-size: 12px; line-height: 1.85; color: var(--muted); }

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 30px;
}
.metric { padding-top: 18px; border-top: 1px solid var(--line); }
.metric .num {
  font-size: 30px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0;
  line-height: 1.3;
}
.metric .num small { font-size: 13px; color: var(--muted); margin-left: 6px; font-weight: 400; }
.metric .cap { margin-top: 8px; font-size: 12.5px; color: var(--muted); line-height: 1.8; }

.pager {
  margin-top: 80px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 40px;
}
.pager a { display: block; max-width: 46%; }
.pager .k { font-size: 11.5px; color: var(--dim); margin-bottom: 8px; }
.pager .t { font-size: 16px; color: var(--text-2); transition: color 0.18s ease; }
.pager a:hover .t { color: var(--accent); }
.pager .next { text-align: right; margin-left: auto; }

/* ---------- 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  :root { --gutter: 28px; }
  .nav { display: none; }
  .nav-toggle { display: block; }
  .header-tel { display: none; }

  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero-visual { max-width: 640px; aspect-ratio: 16 / 9; }

  .section-head { flex-direction: column; align-items: flex-start; gap: 18px; }
  .section-head .desc { text-align: left; max-width: 100%; }

  .cap-card { grid-template-columns: 48px minmax(0, 1fr); }
  .cap-card .tags { grid-column: 2; grid-row: auto; justify-content: flex-start; align-content: start; margin-top: 12px; }

  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 28px; }
  .faq-layout { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .cta-panel { flex-direction: column; align-items: flex-start; gap: 28px; padding: 36px 32px; }
  .cta-panel .right { align-items: flex-start; text-align: left; }

  .footer-body { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
  .case-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  :root { --gutter: 20px; }
  body { font-size: 15.5px; }

  .hero { padding: 56px 0 44px; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 15px; }
  .section { padding: 64px 0; }

  .cap-card { grid-template-columns: minmax(0, 1fr); padding: 26px 0; gap: 8px; }
  .cap-card .top,
  .cap-card h3,
  .cap-card > p,
  .cap-card .tags { grid-column: 1; grid-row: auto; }
  .cap-card .tags { margin-top: 10px; justify-content: flex-start; }

  .case-grid { grid-template-columns: minmax(0, 1fr); gap: 34px; }
  .case-card--wide { flex-direction: column; gap: 0; align-items: stretch; }
  .case-card--wide .cover { flex: none; aspect-ratio: 16 / 9; }
  .case-card--wide .body { padding: 18px 0 0; max-width: 100%; }
  .case-card--wide h4 { font-size: 18px; }

  .steps { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .feature-grid,
  .metrics { grid-template-columns: minmax(0, 1fr); }
  .flow { grid-template-columns: minmax(0, 1fr); }
  .pager { flex-direction: column; gap: 22px; }
  .pager a { max-width: 100%; }
  .pager .next { text-align: left; margin-left: 0; }
  .footer-bottom { flex-direction: column; gap: 6px; }
  .cta-panel { padding: 28px 22px; }
  .cta-panel .tel { font-size: 22px; }
}

@media (max-width: 520px) {
  .brand-en { display: none; }
  .brand-name { font-size: 15px; }
  .hero h1 { font-size: 26px; line-height: 1.45; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  .header-actions .btn-sm { padding: 7px 12px; font-size: 12px; }
  .case-meta { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .eco { gap: 10px 20px; }
  .case-card h4 { font-size: 17px; }
}

/* 移动端菜单 */
.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: #070809;
  padding: 8px 0 18px;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block;
  padding: 13px 0;
  font-size: 15px;
  color: var(--text-2);
  border-bottom: 1px solid #111417;
}
.mobile-nav a:last-child { border-bottom: 0; }