:root {
  --blue-950: #072865;
  --blue-900: #09337c;
  --blue-800: #0c47a1;
  --blue-600: #1763d1;
  --blue-100: #eaf4ff;
  --blue-50: #f6fbff;
  --gold: #d8a636;
  --green: #16853a;
  --text: #17233c;
  --muted: #5f6f89;
  --line: #dce5f1;
  --surface: #ffffff;
  --shadow: 0 14px 38px rgba(15, 45, 91, .12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.65;
  background: #f7faff;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background:
    linear-gradient(115deg, rgba(255,255,255,.95), rgba(233,246,255,.9)),
    radial-gradient(circle at 82% 20%, rgba(23,99,209,.14), transparent 28%);
  border-bottom: 1px solid rgba(12, 71, 161, .12);
}

.brand-band {
  min-height: 172px;
  display: grid;
  grid-template-columns: minmax(270px, 430px) 1fr;
  align-items: center;
  gap: 42px;
  position: relative;
  overflow: hidden;
  padding: 22px 0;
}

.brand-band::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 430px;
  height: 105px;
  opacity: .24;
  background:
    linear-gradient(to top, rgba(23,99,209,.32) 0 2px, transparent 2px 100%),
    linear-gradient(90deg, transparent 0 20px, rgba(23,99,209,.35) 20px 24px, transparent 24px 52px);
  clip-path: polygon(0 72%, 8% 50%, 18% 55%, 24% 28%, 35% 38%, 41% 10%, 49% 42%, 58% 18%, 66% 52%, 76% 31%, 85% 58%, 100% 35%, 100% 100%, 0 100%);
}

.brand {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
}

.brand img {
  width: 232px;
  height: 232px;
  object-fit: contain;
}

.brand-name {
  color: var(--blue-950);
  font-size: 54px;
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1;
  white-space: nowrap;
}

.brand-name::after {
  content: "专业 · 可靠 · 高效 · 安心";
  display: block;
  margin-top: 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--blue-800);
  text-align: center;
  border-top: 2px solid var(--blue-800);
  border-bottom: 2px solid var(--blue-800);
  padding: 5px 0;
}

.brand-copy {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--blue-950);
}

.brand-title {
  margin: 0;
  font-size: 44px;
  line-height: 1.12;
  font-weight: 900;
}

.brand-subtitle {
  margin: 14px auto 0;
  max-width: 620px;
  font-size: 22px;
  font-weight: 700;
  color: var(--blue-900);
}

.brand-support {
  margin: 8px 0 0;
  color: #345783;
  font-size: 17px;
}

.brand-points {
  margin: 14px 0 0;
  color: var(--blue-800);
  font-weight: 700;
}

.price-phone {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 18px 0 0;
  padding: 14px 32px;
  color: #061f55;
  background: linear-gradient(135deg, #ffe100, #ffb000);
  border-radius: 8px;
  border: 3px solid #061f55;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.25;
  box-shadow: 0 14px 34px rgba(116, 76, 12, .28);
}

.price-phone strong {
  color: #c40000;
  font-size: 38px;
  letter-spacing: 0;
}

.main-nav {
  background: var(--blue-950);
}

.nav-shell {
  display: block;
}

.nav-shell summary {
  display: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a {
  flex: 0 0 auto;
  color: #fff;
  font-weight: 700;
  padding: 14px 18px;
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  border-bottom: 4px solid transparent;
}

.nav-links a.active,
.nav-links a:hover {
  color: #ffe2a0;
  border-bottom-color: var(--gold);
}

.price-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 38px;
  background:
    radial-gradient(circle at 50% 0, rgba(255,255,255,.95) 0 28%, rgba(234,244,255,.82) 29% 45%, transparent 46%),
    linear-gradient(135deg, #eaf5ff 0%, #f8fcff 46%, #dceeff 100%);
}

.price-hero::before,
.price-hero::after {
  content: "";
  position: absolute;
  width: 46%;
  height: 160%;
  top: -30%;
  border: 2px solid rgba(23,99,209,.16);
  border-radius: 50%;
}

.price-hero::before {
  left: -18%;
}

.price-hero::after {
  right: -18%;
}

.price-hero .container {
  position: relative;
  z-index: 1;
}

.price-heading {
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin: 0;
  color: var(--blue-800);
  font-size: 20px;
  font-weight: 800;
}

.eyebrow::before,
.eyebrow::after {
  content: "";
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue-600));
}

.eyebrow::after {
  background: linear-gradient(90deg, var(--blue-600), transparent);
}

h1 {
  margin: 8px auto 0;
  color: var(--blue-950);
  font-size: 42px;
  line-height: 1.18;
  font-weight: 900;
}

.price-heading h2 {
  margin: 10px 0 0;
  color: var(--blue-900);
  font-size: 56px;
  line-height: 1.25;
}

.update-time {
  margin: 8px 0 0;
  color: var(--muted);
}

.price-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  max-width: 820px;
  margin: 28px auto 0;
}

.price-card {
  background: rgba(255,255,255,.94);
  border: 2px solid rgba(23,99,209,.38);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.price-card h2 {
  margin: 0;
  padding: 12px 20px;
  color: #fff;
  font-size: 30px;
  line-height: 1.2;
  text-align: center;
  background: linear-gradient(135deg, #1260d8, #0b3b9b);
}

.price-card.electric {
  border-color: rgba(22,133,58,.42);
}

.price-card.electric h2 {
  background: linear-gradient(135deg, #209447, #08702d);
}

.price-card table {
  width: 100%;
  border-collapse: collapse;
}

.price-card caption {
  padding: 12px 18px 0;
  text-align: left;
  color: var(--muted);
  font-weight: 700;
}

.price-card tr + tr {
  border-top: 1px solid var(--line);
}

.price-card th,
.price-card td {
  padding: 11px 22px;
}

.price-card th {
  width: 35%;
  text-align: left;
  color: #fff;
  font-size: 20px;
}

.price-card th::before {
  content: "";
}

.price-card th {
  color: var(--blue-900);
}

.price-card.electric th {
  color: var(--green);
}

.price-card td {
  text-align: right;
  color: var(--blue-900);
  font-size: 38px;
  line-height: 1.1;
  font-weight: 900;
}

.price-card.electric td {
  color: var(--green);
}

.price-card td span {
  margin-right: 9px;
  font-size: 18px;
  vertical-align: middle;
}

.price-note {
  margin: 20px auto 0;
  max-width: 640px;
  text-align: center;
  color: var(--blue-900);
  font-weight: 800;
  background: rgba(255,255,255,.82);
  border: 1px solid rgba(23,99,209,.18);
  border-radius: 8px;
  padding: 10px 16px;
}

.seo-intro {
  margin-top: 30px;
  padding: 22px 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 5px solid var(--blue-600);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(15, 45, 91, .06);
}

.seo-intro p {
  margin: 0;
  color: #33445f;
  font-size: 16px;
}

.topic-section,
.article-section,
.about-section {
  margin-top: 34px;
}

.topic-section h2,
.section-head h2,
.about-section h2 {
  margin: 0 0 16px;
  color: var(--blue-950);
  font-size: 28px;
  line-height: 1.25;
}

.topic-links {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.topic-links a {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 12px;
  color: var(--blue-900);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(15,45,91,.05);
}

.topic-links a:hover {
  border-color: var(--blue-600);
  color: var(--blue-600);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 3px solid var(--blue-950);
  margin-bottom: 0;
}

.section-head p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
}

.news-list {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 0;
  border-radius: 0 0 8px 8px;
  overflow: hidden;
}

.news-item {
  display: grid;
  grid-template-columns: 156px 1fr 26px;
  align-items: center;
  gap: 18px;
  padding: 15px 18px;
}

.news-item + .news-item {
  border-top: 1px solid var(--line);
}

.thumb img {
  width: 156px;
  height: 88px;
  object-fit: cover;
  border-radius: 6px;
}

.news-title {
  display: inline-block;
  color: #111f39;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 900;
}

.news-title:hover {
  color: var(--blue-600);
}

.news-body p {
  margin: 6px 0 8px;
  color: #53647e;
  font-size: 14px;
  line-height: 1.55;
}

.meta {
  display: flex;
  gap: 18px;
  color: #7a8799;
  font-size: 13px;
}

.meta span {
  color: var(--blue-800);
  font-weight: 700;
}

.arrow {
  color: #8190a6;
  font-size: 34px;
  line-height: 1;
}

.about-section h2 {
  text-align: center;
  position: relative;
}

.about-section h2::before,
.about-section h2::after {
  content: "";
  display: inline-block;
  width: 80px;
  height: 2px;
  margin: 0 16px 8px;
  background: linear-gradient(90deg, transparent, var(--gold));
}

.about-section h2::after {
  background: linear-gradient(90deg, var(--gold), transparent);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.about-card {
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(15, 45, 91, .07);
}

.about-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.about-card div {
  padding: 15px 16px 18px;
}

.about-card h3 {
  margin: 0;
  color: var(--blue-900);
  font-size: 20px;
}

.about-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  margin-top: 42px;
  padding-bottom: 78px;
  background: var(--blue-950);
  color: #dbe9ff;
}

.phone-panel {
  min-height: 116px;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 18px 16px;
  color: #fff;
}

.phone-panel.green {
  background: #53b423;
}

.phone-panel.orange {
  background: #f24a00;
}

.phone-panel span {
  font-size: 18px;
  line-height: 1.2;
  font-weight: 800;
}

.phone-panel strong {
  margin-top: 4px;
  font-size: 34px;
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: 0;
}

.sticky-phone {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 82px;
  padding: 0;
  background: transparent;
  border-top: 3px solid rgba(255,255,255,.9);
  box-shadow: 0 -12px 28px rgba(0, 0, 0, .22);
}

.sticky-phone .phone-panel {
  min-height: 82px;
  padding: 10px 12px;
}

.sticky-phone .phone-panel span {
  font-size: 16px;
}

.sticky-phone .phone-panel strong {
  font-size: 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  padding: 28px 0;
}

.footer-grid div {
  min-height: 68px;
  padding: 0 16px;
  border-left: 1px solid rgba(255,255,255,.18);
}

.footer-grid strong,
.footer-grid span {
  display: block;
}

.footer-grid strong {
  color: #fff;
  font-size: 18px;
}

.footer-grid span {
  margin-top: 4px;
  color: #b7cae8;
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 14px 0 18px;
  color: #b7cae8;
  border-top: 1px solid rgba(255,255,255,.16);
  font-size: 14px;
}

@media (max-width: 900px) {
  .brand-band {
    grid-template-columns: 1fr;
    gap: 18px;
    text-align: center;
  }

  .brand {
    justify-content: center;
  }

  .brand-title {
    font-size: 34px;
  }

  h1 {
    font-size: 32px;
  }

  .price-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .topic-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 24px, 1160px);
  }

  .brand-band {
    min-height: 0;
    padding: 18px 0;
  }

  .brand {
    gap: 12px;
  }

  .brand img {
    width: 152px;
    height: 152px;
  }

  .brand-name {
    font-size: 32px;
  }

  .brand-name::after {
    font-size: 12px;
    margin-top: 8px;
  }

  .brand-title {
    font-size: 28px;
  }

  .brand-subtitle {
    font-size: 17px;
  }

  .brand-support,
  .brand-points {
    font-size: 14px;
  }

  .price-phone {
    width: 100%;
    padding: 10px 12px;
    gap: 8px;
    font-size: 18px;
    flex-wrap: wrap;
  }

  .price-phone strong {
    font-size: 30px;
  }

  .nav-shell {
    width: 100%;
  }

  .nav-shell summary {
    display: flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    cursor: pointer;
  }

  .nav-shell:not([open]) .nav-links {
    display: none;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-bottom: 8px;
  }

  .nav-links a {
    justify-content: center;
    min-height: 42px;
    padding: 9px 8px;
    border-bottom-width: 2px;
  }

  .price-hero {
    padding: 24px 0 28px;
  }

  .eyebrow {
    font-size: 16px;
  }

  .eyebrow::before,
  .eyebrow::after {
    width: 36px;
  }

  h1 {
    font-size: 27px;
  }

  .price-heading h2 {
    font-size: 44px;
  }

  .price-grid {
    gap: 16px;
  }

  .price-card h2 {
    font-size: 24px;
  }

  .price-card th,
  .price-card td {
    padding: 10px 16px;
  }

  .price-card td {
    font-size: 32px;
  }

  .seo-intro {
    padding: 18px;
  }

  .topic-section h2,
  .section-head h2,
  .about-section h2 {
    font-size: 24px;
  }

  .section-head {
    display: block;
  }

  .section-head p {
    margin-top: -8px;
  }

  .news-item {
    grid-template-columns: 112px 1fr;
    gap: 12px;
    padding: 14px 12px;
  }

  .thumb img {
    width: 112px;
    height: 72px;
  }

  .news-title {
    font-size: 16px;
  }

  .news-body p {
    font-size: 13px;
  }

  .meta {
    gap: 10px;
    flex-wrap: wrap;
  }

  .arrow {
    display: none;
  }

  .about-section h2::before,
  .about-section h2::after {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .footer-grid div {
    min-height: 0;
  }

  .footer-bottom {
    display: grid;
    gap: 6px;
    text-align: center;
  }

  .sticky-phone {
    min-height: 70px;
  }

  .phone-panel {
    min-height: 92px;
    padding: 14px 8px;
  }

  .phone-panel span {
    font-size: 14px;
  }

  .phone-panel strong {
    font-size: 24px;
  }

  .sticky-phone .phone-panel {
    min-height: 70px;
    padding: 8px 6px;
  }

  .sticky-phone .phone-panel span {
    font-size: 12px;
  }

  .sticky-phone .phone-panel strong {
    font-size: 21px;
  }
}