/* 云鸢科技双产品官网通用样式 */
:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #101318;
  --muted: #5c6673;
  --line: #e1e6ec;
  --line-dark: #c8d0da;
  --ink: #0d1726;
  --blue: #1d4f87;
  --silver: #eef1f5;
  --shadow: 0 18px 48px rgba(16, 24, 40, 0.08);
  --radius: 30px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(180%) blur(18px);
  background: rgba(246, 247, 249, 0.88);
  border-bottom: 1px solid rgba(225, 230, 236, 0.86);
}
.nav-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
  letter-spacing: 0.04em;
}
.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #fff;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  position: relative;
}
.brand-mark::before,
.brand-mark::after { content: ""; position: absolute; background: var(--ink); }
.brand-mark::before { width: 16px; height: 2px; left: 5px; top: 13px; }
.brand-mark::after { width: 2px; height: 16px; left: 13px; top: 5px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; color: var(--muted); }
.nav-links a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 650;
  background: var(--ink);
  color: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 26px rgba(16, 24, 40, 0.16); }
.btn.secondary { color: var(--ink); background: transparent; }
.btn.secondary:hover { background: #fff; }

.hero {
  max-width: none;
  margin: 0;
  padding: 0;
  background: #f5f6f8;
}
.hero-grid {
  display: block;
  min-height: calc(100vh - 59px);
  overflow: hidden;
}
.hero-copy,
.hero-visual,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-grid .hero-copy {
  max-width: 1180px;
  margin: 0 auto;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
  padding: clamp(56px, 8vw, 112px) 22px 26px;
  text-align: center;
  align-items: center;
}
.hero-grid .hero-copy .lead { margin-left: auto; margin-right: auto; }
.hero-grid .hero-actions { justify-content: center; }
.hero-grid .hero-meta { width: min(820px, 100%); }
.kicker { margin: 0 0 18px; color: var(--blue); font-size: 13px; font-weight: 760; letter-spacing: 0.16em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; line-height: 1.08; letter-spacing: -0.035em; }
h1 { font-size: clamp(56px, 8vw, 104px); max-width: 1120px; white-space: nowrap; }
h2 { font-size: clamp(34px, 4vw, 58px); }
h3 { font-size: 24px; }
.lead { margin: 24px 0 0; color: var(--muted); font-size: clamp(17px, 2vw, 21px); max-width: 760px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-meta { margin: 38px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.meta-item { padding-top: 16px; border-top: 1px solid var(--line-dark); }
.meta-value { display: block; font-size: 24px; font-weight: 780; letter-spacing: -0.025em; }
.meta-label { color: var(--muted); font-size: 13px; }
.hero-visual {
  max-width: 1440px;
  margin: 0 auto;
  overflow: hidden;
  min-height: auto;
  display: flex;
  flex-direction: column;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}
.hero-visual img {
  width: 100%;
  height: min(50vw, 620px);
  min-height: 430px;
  object-fit: cover;
  object-position: center;
  mix-blend-mode: multiply;
}
.visual-caption {
  max-width: 1180px;
  width: calc(100% - 44px);
  margin: 0 auto 24px;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-dark);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
  background: transparent;
}

.section { max-width: 1220px; margin: 0 auto; padding: 82px 22px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 32px; }
.section-heading p { margin: 0; max-width: 540px; color: var(--muted); font-size: 17px; }
.center-heading { text-align: center; max-width: 840px; margin: 0 auto 34px; }
.center-heading p { margin: 18px auto 0; color: var(--muted); font-size: 18px; max-width: 680px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: 28px; box-shadow: 0 10px 26px rgba(16, 24, 40, 0.045); }
.card .icon { width: 44px; height: 44px; border: 1px solid var(--line-dark); border-radius: 16px; display: grid; place-items: center; margin-bottom: 20px; color: var(--blue); font-weight: 800; }
.card p, .timeline p, .spec-table td, .price-card p, .footer p { color: var(--muted); }
.card p { margin: 12px 0 0; }

.full-bleed { max-width: 1320px; margin: 0 auto; padding: 70px 22px 20px; }
.wide-product {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.wide-product img { width: 100%; height: min(70vw, 720px); object-fit: cover; }
.wide-copy { padding: 34px clamp(26px, 5vw, 58px) 42px; display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 32px; align-items: start; }
.wide-copy p { margin: 0; color: var(--muted); font-size: 18px; }

.image-split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.image-card { background: #fff; border: 1px solid var(--line); border-radius: 30px; overflow: hidden; box-shadow: 0 10px 28px rgba(16, 24, 40, 0.055); }
.image-card img { width: 100%; height: 430px; object-fit: cover; }
.image-card-body { padding: 26px; }
.image-card-body p { color: var(--muted); margin: 12px 0 0; }
.detail-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 18px; }
.detail-pill { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 18px; }
.detail-pill strong { display: block; font-size: 18px; margin-bottom: 6px; }
.detail-pill span { color: var(--muted); font-size: 14px; }

.showcase { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 18px; }
.showcase-image { border-radius: 28px; overflow: hidden; border: 1px solid var(--line); background: #fff; min-height: 520px; }
.showcase-image img { width: 100%; height: 100%; min-height: 520px; object-fit: cover; }
.timeline { display: grid; gap: 14px; }
.step { padding: 24px; border: 1px solid var(--line); border-radius: 22px; background: var(--card); }
.step span { display: inline-block; margin-bottom: 12px; color: var(--blue); font-weight: 800; letter-spacing: 0.1em; font-size: 12px; }

.spec-table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 22px; background: var(--card); border: 1px solid var(--line); }
.spec-table th, .spec-table td { padding: 19px 22px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.spec-table th { width: 32%; font-weight: 750; color: var(--ink); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
.course-list, .deliver-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.course-list li, .deliver-list li { position: relative; padding: 16px 18px 16px 44px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.course-list li::before, .deliver-list li::before { content: ""; position: absolute; left: 18px; top: 22px; width: 10px; height: 10px; border: 2px solid var(--blue); border-radius: 50%; }

.price-card { background: #fff; border: 1px solid var(--line); border-radius: 26px; padding: 30px; display: flex; flex-direction: column; min-height: 320px; }
.price { font-size: 36px; font-weight: 800; letter-spacing: -0.04em; margin: 20px 0 10px; }
.price-card ul { margin: 18px 0 26px; padding-left: 18px; color: var(--muted); }
.price-card .btn { margin-top: auto; }
.add-on-pricing,
.product-addons { margin-top: 18px; }
.dark-band { background: var(--ink); color: #fff; margin: 70px 0 0; }
.dark-band .section { padding-top: 86px; padding-bottom: 86px; }
.dark-band p, .dark-band .card p { color: #c8d0da; }
.dark-band .card { background: rgba(255, 255, 255, 0.06); border-color: rgba(255, 255, 255, 0.14); box-shadow: none; }
.dark-band .course-list li, .dark-band .deliver-list li { background: rgba(255, 255, 255, 0.06); border-color: rgba(255, 255, 255, 0.14); color: #e8edf3; }

.footer {
  max-width: 1220px;
  margin: 0 auto;
  padding: 48px 22px 70px;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 1.45fr;
  justify-content: space-between;
  align-items: stretch;
  gap: 48px;
  border-top: 1px solid var(--line);
}
.footer-brand { display: flex; flex-direction: column; gap: 12px; height: 100%; }
.footer-brand-head { display: flex; align-items: center; gap: 10px; }
.footer-brand strong { color: var(--ink); }
.footer-brand p { margin: 0; max-width: 420px; }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(120px, 1fr)); gap: 38px; align-items: start; height: 100%; }
.footer-col h4 { margin: 0 0 14px; font-size: 14px; font-weight: 760; letter-spacing: 0.04em; color: var(--ink); }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--muted); font-size: 14px; font-weight: 500; }
.footer-col a:hover { color: var(--text); }
.footer strong { color: var(--ink); }

.prototype { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 30px; }
.prototype-frame { position: relative; height: 390px; border: 1px solid var(--line-dark); border-radius: 22px; background: #f9fafb; overflow: hidden; }
.proto-arm, .proto-body, .proto-wing, .proto-tail, .proto-boom, .proto-rotor, .proto-motor, .proto-payload { position: absolute; border: 2px solid #253244; background: #fff; }
.multirotor .proto-body { width: 112px; height: 92px; left: calc(50% - 56px); top: calc(50% - 46px); border-radius: 18px; }
.multirotor .proto-arm { width: 310px; height: 10px; left: calc(50% - 155px); top: calc(50% - 5px); transform-origin: center; border-radius: 99px; }
.multirotor .arm-b { transform: rotate(90deg); }
.multirotor .arm-c { transform: rotate(45deg); opacity: 0.35; }
.multirotor .arm-d { transform: rotate(-45deg); opacity: 0.35; }
.multirotor .proto-rotor { width: 80px; height: 80px; border-radius: 50%; background: transparent; }
.multirotor .r1 { left: 86px; top: 67px; }
.multirotor .r2 { right: 86px; top: 67px; }
.multirotor .r3 { left: 86px; bottom: 67px; }
.multirotor .r4 { right: 86px; bottom: 67px; }
.multirotor .proto-payload { width: 50px; height: 34px; left: calc(50% - 25px); top: calc(50% + 58px); border-radius: 10px; }
.vtol .proto-wing { width: 72%; height: 54px; left: 14%; top: 142px; border-radius: 28px; }
.vtol .proto-body { width: 320px; height: 42px; left: calc(50% - 160px); top: 148px; border-radius: 28px; }
.vtol .proto-tail { width: 112px; height: 34px; right: 96px; top: 240px; border-radius: 18px; }
.vtol .proto-boom { width: 220px; height: 8px; left: calc(50% - 110px); top: 220px; border-radius: 99px; }
.vtol .proto-rotor { width: 62px; height: 62px; border-radius: 50%; background: transparent; }
.vtol .r1 { left: 135px; top: 93px; }
.vtol .r2 { right: 135px; top: 93px; }
.vtol .r3 { left: 135px; top: 205px; }
.vtol .r4 { right: 135px; top: 205px; }
.vtol .proto-motor { width: 42px; height: 42px; left: 95px; top: 148px; border-radius: 50%; }
.vtol .proto-payload { width: 58px; height: 36px; left: calc(50% - 29px); top: 196px; border-radius: 10px; }
.note { color: var(--muted); font-size: 14px; margin: 18px 0 0; }

.page-hero {
  padding-top: 96px;
  padding-bottom: 36px;
}
.page-hero h1 {
  font-size: clamp(48px, 7vw, 92px);
  white-space: normal;
}
.article-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  padding-top: 36px;
}
.article-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(24px, 3vw, 34px);
  box-shadow: 0 10px 26px rgba(16, 24, 40, 0.045);
  display: flex;
  flex-direction: column;
  min-height: 300px;
}
.article-card h2 {
  font-size: clamp(24px, 2.4vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  white-space: normal;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
.article-card p {
  color: var(--muted);
  max-width: 920px;
}
.article-card .btn { margin-top: auto; }
.article-detail {
  max-width: 980px;
  padding-top: 78px;
}
.article-detail h1 {
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.12;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: keep-all;
}
.article-detail .lead {
  max-width: 860px;
}
.article-detail img {
  width: 100%;
  max-height: 520px;
  object-fit: cover;
  border-radius: 30px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  margin: 42px 0;
}
.article-detail h2 {
  font-size: clamp(28px, 3vw, 42px);
  margin: 42px 0 16px;
  white-space: normal;
}
.article-detail p {
  color: var(--muted);
  font-size: 18px;
}
.article-detail a {
  color: var(--blue);
  font-weight: 760;
}
.contact-card a,
.footer a {
  color: var(--blue);
  font-weight: 760;
}
.card ul {
  color: var(--muted);
  padding-left: 20px;
}

@media (max-width: 960px) {
  .showcase, .grid-2, .grid-3, .image-split, .wide-copy, .detail-strip, .footer, .footer-links, .article-list { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  .nav-links { display: none; }
}
@media (max-width: 640px) {
  .hero-grid { min-height: auto; }
  .hero-grid .hero-copy { padding-top: 46px; }
  h1 { font-size: clamp(40px, 12vw, 58px); white-space: normal; }
  .hero-meta { grid-template-columns: 1fr; }
  .hero-visual img { height: 360px; min-height: 360px; mix-blend-mode: normal; }
  .visual-caption { display: block; }
  .prototype-frame { height: 300px; }
  .image-card img { height: 300px; }
  .wide-product img { height: 360px; }
}