/* 河南国测 — 工业精密视觉系统 */
:root {
  --bg-deep: #0f1a22;
  --bg-deep-2: #162532;
  --bg-light: #f4f7f9;
  --bg-light-2: #e8eef2;
  --ink: #1a2a35;
  --ink-muted: #5a6d7a;
  --steel: #1b6b93;
  --steel-bright: #2a8bb8;
  --steel-soft: rgba(27, 107, 147, 0.12);
  --amber: #c47a2c;
  --amber-hover: #a86520;
  --line: rgba(255, 255, 255, 0.12);
  --line-dark: rgba(15, 26, 34, 0.1);
  --white: #ffffff;
  --radius: 2px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --header-h: 72px;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: var(--steel);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--steel-bright);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--steel);
  outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* —— Header —— */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease),
    backdrop-filter 0.35s var(--ease);
}

.site-header.is-scrolled,
.site-header.theme-light {
  background: rgba(244, 247, 249, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line-dark);
}

.site-header.theme-dark:not(.is-scrolled) {
  background: transparent;
  color: var(--white);
}

.site-header.theme-dark:not(.is-scrolled) .brand,
.site-header.theme-dark:not(.is-scrolled) .site-nav a,
.site-header.theme-dark:not(.is-scrolled) .nav-toggle {
  color: var(--white);
}

.site-header.theme-dark.is-scrolled .brand,
.site-header.theme-dark.is-scrolled .site-nav a,
.site-header.theme-dark.is-scrolled .nav-toggle,
.site-header.theme-light .brand,
.site-header.theme-light .site-nav a,
.site-header.theme-light .nav-toggle {
  color: var(--ink);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand-mark {
  width: 36px;
  height: 36px;
  color: var(--steel-bright);
  flex-shrink: 0;
}

.site-header.theme-dark:not(.is-scrolled) .brand-mark {
  color: #7ec4e0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand-en {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.65;
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  position: relative;
  padding: 0.5rem 0.85rem;
  font-size: 0.92rem;
  color: inherit;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.2rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
  opacity: 0.7;
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.site-nav a.is-active {
  font-weight: 500;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
  color: inherit;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  margin: 5px auto;
  background: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-h) + 4rem) 0 5.5rem;
  color: var(--white);
  background: var(--bg-deep);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(15, 26, 34, 0.92) 0%, rgba(15, 26, 34, 0.55) 48%, rgba(22, 50, 70, 0.75) 100%),
    radial-gradient(ellipse 80% 60% at 70% 40%, rgba(27, 107, 147, 0.35), transparent 55%),
    linear-gradient(180deg, #0f1a22 0%, #1a3548 100%);
  z-index: 0;
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(126, 196, 224, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 196, 224, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 90%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 15%;
  width: min(55vw, 560px);
  height: min(55vw, 560px);
  border: 1px solid rgba(126, 196, 224, 0.18);
  border-radius: 50%;
  box-shadow:
    inset 0 0 0 60px rgba(126, 196, 224, 0.03),
    inset 0 0 0 120px rgba(126, 196, 224, 0.02);
}

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

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0 0 0.35em;
  opacity: 0;
  transform: translateY(28px);
  animation: rise-in 0.9s var(--ease) 0.15s forwards;
}

.hero-tagline {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  max-width: 28em;
  margin: 0 0 2rem;
  color: rgba(255, 255, 255, 0.82);
  opacity: 0;
  transform: translateY(28px);
  animation: rise-in 0.9s var(--ease) 0.35s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  opacity: 0;
  transform: translateY(28px);
  animation: rise-in 0.9s var(--ease) 0.55s forwards;
}

.hero-scale {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 48px;
  z-index: 1;
  background: repeating-linear-gradient(
    90deg,
    rgba(126, 196, 224, 0.35) 0,
    rgba(126, 196, 224, 0.35) 1px,
    transparent 1px,
    transparent 16px
  );
  mask-image: linear-gradient(90deg, transparent, #000 15%, #000 85%, transparent);
  opacity: 0.5;
}

@keyframes rise-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease), transform 0.2s var(--ease);
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--amber);
  color: var(--white);
  border-color: var(--amber);
}

.btn-primary:hover {
  background: var(--amber-hover);
  border-color: var(--amber-hover);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.75);
  color: var(--white);
}

.btn-steel {
  background: var(--steel);
  color: var(--white);
  border-color: var(--steel);
}

.btn-steel:hover {
  background: var(--steel-bright);
  border-color: var(--steel-bright);
  color: var(--white);
}

.btn-outline-dark {
  background: transparent;
  color: var(--ink);
  border-color: rgba(26, 42, 53, 0.35);
}

.btn-outline-dark:hover {
  border-color: var(--steel);
  color: var(--steel);
}

/* —— Sections —— */
.section {
  padding: 5.5rem 0;
}

.section-dark {
  background: var(--bg-deep);
  color: var(--white);
}

.section-muted {
  background: var(--bg-light-2);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.section-dark .section-label {
  color: #7ec4e0;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  letter-spacing: 0.04em;
  margin-bottom: 0.5em;
}

.section-lead {
  max-width: 36em;
  color: var(--ink-muted);
  margin-bottom: 2.5rem;
}

.section-dark .section-lead {
  color: rgba(255, 255, 255, 0.7);
}

.page-hero {
  padding: calc(var(--header-h) + 3.5rem) 0 3rem;
  background: var(--bg-deep);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(126, 196, 224, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 196, 224, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.8;
}

.page-hero .container {
  position: relative;
}

.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  letter-spacing: 0.08em;
  margin-bottom: 0.4em;
}

.page-hero p {
  max-width: 34em;
  color: rgba(255, 255, 255, 0.72);
  margin: 0;
}

/* —— Service grid —— */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-dark);
}

.service-item {
  padding: 2.25rem 1.75rem 2.25rem 0;
  border-bottom: 1px solid var(--line-dark);
  border-right: 1px solid var(--line-dark);
}

.service-item:nth-child(3n) {
  border-right: 0;
  padding-right: 0;
}

.service-item:nth-child(n + 4) {
  border-bottom: 0;
}

.service-num {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--steel);
  margin-bottom: 1rem;
}

.service-item h3 {
  font-size: 1.25rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.service-item p {
  color: var(--ink-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.link-arrow::after {
  content: "→";
  transition: transform 0.25s var(--ease);
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

/* —— Process —— */
.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  counter-reset: step;
}

.process-item {
  position: relative;
  padding-top: 1rem;
}

.process-item::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  color: rgba(126, 196, 224, 0.35);
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.process-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.process-item p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
  margin: 0;
}

/* —— Trust strip —— */
.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.trust-item {
  font-size: 0.92rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
}

.trust-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.15rem;
  letter-spacing: 0.06em;
}

/* —— CTA band —— */
.cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-band h2 {
  margin: 0 0 0.35em;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: 0.05em;
}

.cta-band p {
  margin: 0;
  color: var(--ink-muted);
  max-width: 28em;
}

/* —— Detail blocks —— */
.detail-block {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  padding: 3rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.detail-block:last-child {
  border-bottom: 0;
}

.detail-block h2 {
  font-size: 1.6rem;
  letter-spacing: 0.06em;
}

.detail-meta {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--steel);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.feature-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.65rem;
  color: var(--ink-muted);
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 1px;
  background: var(--steel);
}

/* —— Qual / values —— */
.qual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.qual-card {
  padding: 1.75rem;
  background: var(--white);
  border-left: 3px solid var(--steel);
}

.qual-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.qual-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.note-banner {
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  background: var(--steel-soft);
  border: 1px solid rgba(27, 107, 147, 0.2);
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.value-item h3 {
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.value-item p {
  color: var(--ink-muted);
  margin: 0;
  font-size: 0.95rem;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line-dark);
}

.stat-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--steel);
  letter-spacing: 0.04em;
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.stat-item span {
  font-size: 0.9rem;
  color: var(--ink-muted);
}

/* —— Contact —— */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3.5rem;
  align-items: start;
}

.invite-list {
  margin: 1.5rem 0 2rem;
}

.invite-list li {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.invite-list li:first-child {
  border-top: 1px solid var(--line-dark);
}

.invite-list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.invite-list span {
  display: block;
  font-size: 0.92rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

.contact-quote {
  margin: 0;
  padding: 1.25rem 0 0 1.25rem;
  border-left: 2px solid var(--steel);
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
  font-weight: 500;
}

.contact-form {
  background: var(--white);
  padding: 2rem;
  border: 1px solid var(--line-dark);
}

.form-intro {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.form-row {
  margin-bottom: 1.15rem;
}

.form-row label {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
  color: var(--ink-muted);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1px solid rgba(26, 42, 53, 0.18);
  border-radius: var(--radius);
  background: var(--bg-light);
  color: var(--ink);
  transition: border-color 0.2s;
}

.form-row select {
  cursor: pointer;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--steel) 50%),
    linear-gradient(135deg, var(--steel) 50%, transparent 50%);
  background-position: calc(100% - 18px) calc(50% - 2px),
    calc(100% - 12px) calc(50% - 2px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--steel);
  outline: none;
}

.form-row input.is-invalid,
.form-row select.is-invalid,
.form-row textarea.is-invalid {
  border-color: #b33a3a;
}

.form-row textarea {
  min-height: 140px;
  resize: vertical;
}

.form-status {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  min-height: 1.4em;
}

.form-status.is-error {
  color: #b33a3a;
}

.form-status.is-info {
  color: var(--steel);
}

/* —— Footer —— */
.site-footer {
  background: var(--bg-deep-2);
  color: rgba(255, 255, 255, 0.65);
  padding: 3.5rem 0 2rem;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.footer-brand span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  opacity: 0.55;
  margin-top: 0.35rem;
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  font-family: var(--font-body);
  font-weight: 500;
}

.footer-col a,
.footer-col span {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  padding: 0.25rem 0;
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: #7ec4e0;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8rem;
  opacity: 0.75;
}

/* —— Reveal —— */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

/* —— Responsive —— */
@media (max-width: 900px) {
  .service-grid {
    grid-template-columns: 1fr;
  }

  .service-item {
    border-right: 0;
    padding-right: 0;
  }

  .service-item:nth-child(n + 4) {
    border-bottom: 1px solid var(--line-dark);
  }

  .service-item:last-child {
    border-bottom: 0;
  }

  .process-list {
    grid-template-columns: 1fr 1fr;
  }

  .detail-block,
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .values-grid,
  .stats-row,
  .qual-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
    z-index: 110;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 0.5rem;
    background: var(--bg-deep);
    color: var(--white);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease), visibility 0.3s;
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    font-size: 1.25rem;
    font-family: var(--font-display);
    letter-spacing: 0.1em;
    padding: 0.75rem 1.5rem;
    color: var(--white);
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    align-items: center;
    padding-bottom: 4rem;
  }

  .process-list {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-brand,
  .hero-tagline,
  .hero-actions,
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
    transition: none;
  }
}