:root {
  --ink: #13233a;
  --muted: #63758a;
  --line: #d9e4ef;
  --surface: #f4f8fc;
  --white: #ffffff;
  --blue: #0b5fa8;
  --deep-blue: #123a66;
  --cyan: #1b98d2;
  --green: #69b24d;
  --gold: #d7b779;
  --shadow: 0 24px 70px rgba(19, 35, 58, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Noto Sans CJK SC",
    Arial,
    sans-serif;
  line-height: 1.6;
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  width: 100%;
  min-height: 78px;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto minmax(120px, 1fr);
  align-items: center;
  gap: 22px;
  padding: 12px clamp(20px, 4vw, 64px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(217, 228, 239, 0.82);
  backdrop-filter: blur(18px);
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 12px 28px rgba(19, 35, 58, 0.08);
}

.brand,
.nav,
.header-action {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  width: max-content;
  max-width: 100%;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 116px;
  height: 54px;
  object-fit: contain;
}

.brand span {
  white-space: nowrap;
}

.nav {
  gap: clamp(16px, 2.2vw, 34px);
  color: #2c4562;
  font-size: 15px;
  white-space: nowrap;
}

.nav a {
  padding: 8px 0;
}

.header-action {
  justify-self: end;
  min-height: 42px;
  padding: 0 18px;
  color: var(--white);
  background: var(--blue);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 800;
}

.menu-toggle {
  display: none;
}

.hero {
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  gap: clamp(32px, 5vw, 82px);
  align-items: center;
  padding: 128px clamp(20px, 5vw, 88px) 60px;
  background:
    linear-gradient(122deg, rgba(244, 248, 252, 0.98) 0%, rgba(244, 248, 252, 0.88) 48%, rgba(255, 255, 255, 0.8) 100%),
    radial-gradient(circle at 8% 92%, rgba(105, 178, 77, 0.2), transparent 30%),
    radial-gradient(circle at 92% 8%, rgba(27, 152, 210, 0.16), transparent 32%);
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  max-width: 720px;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.06;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 650px;
  margin-bottom: 34px;
  color: #4b5f73;
  font-size: clamp(17px, 1.6vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 900;
  cursor: pointer;
}

.button.primary {
  color: var(--white);
  background: var(--blue);
}

.button.secondary {
  color: var(--deep-blue);
  border-color: var(--line);
  background: var(--white);
}

.hero-media {
  position: relative;
  height: min(66vh, 620px);
  min-height: 420px;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-media::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(180deg, transparent 50%, rgba(11, 42, 73, 0.28) 100%);
  pointer-events: none;
}

.metric-panel {
  position: absolute;
  right: 24px;
  bottom: 24px;
  z-index: 2;
  width: 178px;
  padding: 18px;
  color: var(--white);
  background: rgba(18, 58, 102, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  backdrop-filter: blur(14px);
}

.metric-panel strong {
  display: block;
  font-size: 34px;
  line-height: 1;
}

.metric-panel span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  padding: 0 clamp(20px, 5vw, 88px) 72px;
  background: var(--white);
}

.trust-strip div {
  min-height: 128px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px;
  background: var(--surface);
}

.trust-strip strong {
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1;
  color: var(--deep-blue);
}

.trust-strip span {
  margin-top: 10px;
  color: var(--muted);
}

.section,
.process {
  padding: 88px clamp(20px, 5vw, 88px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 36px;
}

.section-heading h2,
.feature-copy h2,
.contact-section h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 3.4vw, 50px);
  line-height: 1.14;
  letter-spacing: 0;
}

.section-heading p:last-child,
.contact-section p,
.feature-copy p {
  color: var(--muted);
}

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

.service-card,
.space-card,
.case-list article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.service-card {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  padding: 28px;
}

.card-index {
  margin-bottom: 52px;
  color: var(--green);
  font-weight: 900;
}

.service-card h3,
.case-list h3,
.point-list h3,
.space-card h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.service-card p,
.case-list p,
.point-list p,
.space-card p {
  color: var(--muted);
}

.feature-band {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  padding: 90px clamp(20px, 5vw, 88px);
  background: linear-gradient(135deg, #123a66 0%, #0a284a 74%);
  color: var(--white);
}

.feature-image {
  height: min(52vw, 540px);
  min-height: 360px;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.24);
}

.feature-copy {
  max-width: 720px;
}

.feature-copy .eyebrow {
  color: #8bd3ff;
}

.feature-copy p,
.point-list p {
  color: rgba(255, 255, 255, 0.76);
}

.point-list {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.point-list div {
  padding: 0 0 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.space-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 18px;
}

.space-card {
  min-height: 210px;
  padding: 24px;
}

.space-card.large {
  grid-row: span 2;
  display: grid;
  gap: 22px;
  padding: 0;
  overflow: hidden;
}

.space-card.large img {
  height: 360px;
}

.space-card.large div {
  padding: 0 26px 26px;
}

.space-card span,
.case-list span {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--blue);
  font-weight: 900;
}

.compact {
  padding-bottom: 54px;
}

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

.case-list article {
  overflow: hidden;
}

.case-list img {
  height: 220px;
}

.case-list article div {
  padding: 24px;
}

.process {
  padding-top: 54px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.process-steps li {
  position: relative;
  min-height: 118px;
  padding: 22px;
  background: var(--surface);
  border-radius: 8px;
  counter-increment: step;
}

.process-steps li::before {
  display: block;
  margin-bottom: 18px;
  color: var(--green);
  content: "0" counter(step);
  font-weight: 900;
}

.process-steps span {
  font-size: 18px;
  font-weight: 900;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(360px, 0.68fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
  padding: 92px clamp(20px, 5vw, 88px);
  color: var(--white);
  background: linear-gradient(135deg, #0b5fa8 0%, #123a66 72%);
}

.contact-section .eyebrow {
  color: #bfe8ff;
}

.contact-section p {
  color: rgba(255, 255, 255, 0.76);
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.12);
  font: inherit;
  outline: none;
}

.contact-form textarea {
  min-height: 112px;
  resize: vertical;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 88px);
  color: #5f7082;
  background: var(--white);
  border-top: 1px solid var(--line);
}

@media (max-width: 1160px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav,
  .header-action {
    display: none;
  }

  .menu-toggle {
    display: grid;
    gap: 6px;
    width: 42px;
    height: 42px;
    place-content: center;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
  }

  .menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--ink);
  }

  .site-header.menu-open .nav {
    position: fixed;
    top: 78px;
    left: 0;
    display: grid;
    width: 100%;
    gap: 0;
    padding: 12px 20px 20px;
    background: var(--white);
    box-shadow: 0 18px 28px rgba(19, 35, 58, 0.1);
  }

  .site-header.menu-open .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .hero,
  .feature-band,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 118px;
  }

  .hero-media {
    height: 50vh;
    min-height: 360px;
  }

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

  .trust-strip,
  .process-steps,
  .space-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .brand img {
    width: 88px;
    height: 42px;
  }

  .brand span {
    max-width: 168px;
    white-space: normal;
    font-size: 14px;
    line-height: 1.25;
  }

  h1 {
    font-size: 38px;
  }

  .hero {
    padding: 108px 20px 34px;
  }

  .hero-media {
    min-height: 300px;
  }

  .metric-panel {
    right: 14px;
    bottom: 14px;
    width: 150px;
  }

  .trust-strip,
  .service-grid,
  .case-list,
  .process-steps,
  .space-grid {
    grid-template-columns: 1fr;
  }

  .trust-strip {
    padding-bottom: 36px;
  }

  .section,
  .process,
  .feature-band,
  .contact-section {
    padding: 58px 20px;
  }

  .service-card {
    min-height: 230px;
  }

  .space-card.large img {
    height: 260px;
  }

  .case-list img {
    height: 190px;
  }

  .contact-section {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
  }
}


/* Sub-page welcome banners */
.welcome-banner {
  padding: 120px 5vw 60px;
  background: linear-gradient(135deg, var(--deep-blue) 0%, var(--cyan) 100%);
  color: var(--white);
  text-align: center;
}
.welcome-banner h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--white);
}
.welcome-banner p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 640px;
  margin: 0 auto;
  opacity: 0.88;
  line-height: 1.7;
}
@media (max-width: 640px) {
  .welcome-banner { padding: 100px 5vw 40px; }
}

/* ========== 加大版优化 ========== */

/* 板块间距增大 */
.section,
.feature-band,
.contact-section,
.process {
  padding: 80px 5vw;
}

.section.compact {
  padding: 80px 5vw;
}

/* 服务卡片加大 */
.service-card {
  min-height: 300px;
  padding: 36px 32px;
}

.service-card h3 {
  font-size: 24px;
  margin-bottom: 14px;
}

.service-card p {
  font-size: 16px;
  line-height: 1.7;
}

.card-index {
  font-size: 28px;
  margin-bottom: 14px;
}

.service-grid {
  gap: 24px;
}

/* 空间方案卡片加大 */
.space-card {
  min-height: 260px;
  padding: 30px 28px;
}

.space-card.large img {
  height: 420px;
}

.space-card span {
  font-size: 15px;
}

.space-card h3 {
  font-size: 23px;
}

.space-grid {
  gap: 24px;
}

/* 案例卡片加大 */
.case-list {
  gap: 24px;
}

.case-list img {
  height: 260px;
}

.case-list article div {
  padding: 28px;
}

.case-list h3 {
  font-size: 22px;
}

.case-list p {
  font-size: 15px;
  line-height: 1.7;
}

/* 联系表单加大 */
.contact-section form {
  max-width: 520px;
}

.contact-section input,
.contact-section textarea {
  padding: 14px 16px;
  font-size: 16px;
}

.contact-section button {
  padding: 16px 32px;
  font-size: 17px;
}

/* 优势特征区加大 */
.feature-copy h2 {
  font-size: clamp(26px, 3vw, 36px);
}

.point-list h3 {
  font-size: 22px;
}

.point-list p {
  font-size: 16px;
  line-height: 1.7;
}

.feature-image img {
  max-height: 500px;
}

/* hero 区更大 */
.hero-copy h1 {
  font-size: clamp(28px, 3.8vw, 52px);
  line-height: 1.2;
}

.hero-lede {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.8;
}

/* section heading 加大 */
.section-heading h2 {
  font-size: clamp(28px, 3.2vw, 42px);
}

.section-heading p {
  font-size: 17px;
}

/* 导航也加宽 */
.site-header {
  padding: 18px 5vw;
}

.nav a {
  font-size: 16px;
  padding: 8px 16px;
}

/* footer 加大 */
.footer {
  padding: 32px 5vw;
  font-size: 15px;
}