:root {
  --ink: #12151a;
  --ink-2: #1c222b;
  --ink-3: #2a333e;
  --paper: #f3efe6;
  --paper-2: #e8e2d6;
  --paper-3: #ddd5c6;
  --copper: #c4843c;
  --copper-2: #e0a85c;
  --copper-dim: rgba(196, 132, 60, 0.18);
  --steel: #6b7c8a;
  --mist: #9aa7b2;
  --line: rgba(18, 21, 26, 0.1);
  --line-dark: rgba(243, 239, 230, 0.12);
  --danger: #b43c28;
  --ok: #3d5a4c;
  --shadow: 0 18px 50px rgba(18, 21, 26, 0.12);
  --font-display: "Syne", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Source Sans 3", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  --header-h: 76px;
  --max: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: 0;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

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

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--copper);
  color: var(--ink);
  padding: 8px 12px;
  z-index: 100;
}

.skip:focus {
  top: 12px;
}

.container {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
}

.section {
  padding: 88px 0;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 14px;
}

.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.muted {
  color: #4d5863;
}

.rule {
  height: 1px;
  background: linear-gradient(90deg, var(--copper), transparent);
  border: 0;
  margin: 28px 0 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(18, 21, 26, 0.94);
  color: var(--paper);
  border-bottom: 1px solid rgba(196, 132, 60, 0.28);
  backdrop-filter: blur(16px);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand img {
  width: 36px;
  height: 36px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.2;
}

.brand-cn {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  display: block;
  margin: 0;
  padding: 0;
  text-align: left;
}

.brand-en {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--copper-2);
  white-space: nowrap;
  display: block;
  margin: 0;
  padding: 0;
  text-align: left;
}

.nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  padding: 8px 10px;
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
}

.nav a:hover,
.nav a.is-active {
  color: var(--paper);
  border-bottom-color: var(--copper);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang {
  display: flex;
  border: 1px solid rgba(196, 132, 60, 0.4);
  border-radius: 2px;
  overflow: hidden;
}

.lang button {
  padding: 5px 9px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.lang button.is-active {
  background: var(--copper);
  color: var(--ink);
}

.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(196, 132, 60, 0.4);
  color: var(--paper);
}

.menu-btn span,
.menu-btn span::before,
.menu-btn span::after {
  display: block;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  margin: 0 auto;
  position: relative;
}

.menu-btn span::before,
.menu-btn span::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-btn span::before {
  top: -5px;
}

.menu-btn span::after {
  top: 5px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 2px;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-copper {
  background: var(--copper);
  color: var(--ink);
}

.btn-copper:hover {
  background: var(--copper-2);
}

.btn-ghost {
  border: 1px solid currentColor;
  background: transparent;
}

.btn-dark {
  background: var(--ink);
  color: var(--paper);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* Hero */
.hero {
  background:
    radial-gradient(900px 420px at 80% 20%, rgba(196, 132, 60, 0.16), transparent 60%),
    var(--ink);
  color: var(--paper);
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 48px;
  background: linear-gradient(180deg, transparent, var(--paper));
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
  min-height: calc(100vh - var(--header-h) - 20px);
  padding: 56px 0 80px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 62px);
  max-width: 12em;
}

.hero .lead {
  margin-top: 20px;
  font-size: 18px;
  color: var(--mist);
  max-width: 36em;
}

.hero-meta {
  display: flex;
  gap: 28px;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark);
}

.hero-meta b {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--copper-2);
}

.hero-meta span {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.hero-art {
  position: relative;
}

.hero-art img {
  width: 100%;
  opacity: 0.95;
}

/* Sections */
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 40px;
}

.section-head h2 {
  font-size: clamp(28px, 3.4vw, 42px);
}

.page-hero {
  background: var(--ink);
  color: var(--paper);
  padding: 64px 0 48px;
  border-bottom: 3px solid var(--copper);
}

.page-hero h1 {
  font-size: clamp(32px, 4vw, 52px);
  margin-top: 8px;
}

.crumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.crumb a:hover {
  color: var(--copper-2);
}

/* Cards / grids */
.card-grid,
.product-grid,
.logo-grid,
.stat-grid,
.split {
  display: grid;
  gap: 20px;
}

.card-grid {
  grid-template-columns: repeat(3, 1fr);
}

.product-grid {
  grid-template-columns: repeat(3, 1fr);
}

.stat-grid {
  grid-template-columns: repeat(4, 1fr);
}

.split {
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.card,
.product-card,
.panel {
  background: #faf8f4;
  border: 1px solid var(--line);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card h3,
.product-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 12px 0 8px;
}

.card .idx,
.product-card .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--copper);
  letter-spacing: 0.14em;
}

.icon-frame {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  background: var(--ink);
  border: 1px solid var(--copper);
}

.product-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.product-card svg {
  width: 100%;
  height: 140px;
  background: var(--ink-2);
  margin: -24px -24px 18px;
  width: calc(100% + 48px);
  border-bottom: 1px solid rgba(196, 132, 60, 0.3);
}

.spec {
  margin-top: auto;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #5b6772;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filters button {
  border: 1px solid var(--line);
  padding: 7px 12px;
  font-size: 13px;
  background: #faf8f4;
}

.filters button.is-active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.product-card[hidden] {
  display: none;
}

/* Stats / band */
.band {
  background: var(--ink);
  color: var(--paper);
}

.band .stat-grid {
  padding: 8px 0;
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 36px;
  color: var(--copper-2);
  line-height: 1;
}

.stat span {
  display: block;
  margin-top: 8px;
  color: var(--mist);
  font-size: 14px;
}

/* Logo wall */
.logo-grid {
  grid-template-columns: repeat(5, 1fr);
}

.logo-plate {
  min-height: 88px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: #faf8f4;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-3);
}

.note {
  margin-top: 16px;
  font-size: 13px;
  color: #6a7380;
}

/* Timeline */
.timeline {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--copper);
  padding-left: 24px;
}

.timeline li {
  padding: 0 0 28px;
  position: relative;
}

.timeline li::before {
  content: "";
  width: 9px;
  height: 9px;
  background: var(--copper);
  position: absolute;
  left: -29px;
  top: 6px;
}

.timeline strong {
  font-family: var(--font-mono);
  color: var(--copper);
  margin-right: 10px;
}

/* Quality list */
.check-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
}

.check-list b {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--copper);
}

/* Contact */
.form {
  display: grid;
  gap: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

label span {
  display: block;
  font-size: 13px;
  margin-bottom: 6px;
  color: #4d5863;
}

input,
select,
textarea {
  width: 100%;
  background: #faf8f4;
  border: 1px solid var(--line);
  padding: 11px 12px;
  border-radius: 2px;
}

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

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--copper);
  outline-offset: 1px;
}

.form-success {
  display: none;
  padding: 18px;
  background: #e7efe8;
  border: 1px solid var(--ok);
}

.form-success.is-on {
  display: block;
}

.contact-card {
  background: var(--ink);
  color: var(--paper);
  padding: 28px;
}

.contact-card h3 {
  font-family: var(--font-display);
  margin-bottom: 12px;
}

.contact-card p,
.contact-card a {
  color: var(--mist);
}

.contact-card a:hover {
  color: var(--copper-2);
}

/* Footer */
.site-footer {
  background: #0d1014;
  color: var(--paper);
  padding: 56px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line-dark);
}

.site-footer a {
  color: var(--mist);
}

.site-footer a:hover {
  color: var(--copper-2);
}

.site-footer h4 {
  font-family: var(--font-display);
  margin-bottom: 12px;
}

.legal {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  color: var(--steel);
  font-size: 12px;
}

/* Quote strip */
.cta-strip {
  background:
    linear-gradient(90deg, rgba(196, 132, 60, 0.16), transparent),
    var(--ink-2);
  color: var(--paper);
}

.cta-strip .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

/* Process */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.steps li {
  padding: 20px;
  background: #faf8f4;
  border-top: 3px solid var(--copper);
}

.steps .n {
  font-family: var(--font-mono);
  color: var(--copper);
  font-size: 12px;
}

/* News */
.news-list {
  display: grid;
  gap: 0;
}

.news-list a {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  align-items: center;
}

.news-list time {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--copper);
}

/* Mobile */
@media (max-width: 960px) {
  .hero-grid,
  .split,
  .card-grid,
  .product-grid,
  .stat-grid,
  .footer-grid,
  .steps,
  .form-row {
    grid-template-columns: 1fr 1fr;
  }

  .logo-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-h);
    background: var(--ink);
    flex-direction: column;
    padding: 12px 20px 20px;
    border-bottom: 1px solid rgba(196, 132, 60, 0.28);
  }

  .nav.is-open {
    display: flex;
  }

  .menu-btn {
    display: grid;
    place-items: center;
  }

  .header-inner .btn-copper {
    display: none;
  }

  .hero-grid {
    min-height: auto;
    padding-top: 40px;
  }

  .cta-strip .container,
  .section-head,
  .legal,
  .news-list a {
    flex-direction: column;
    align-items: flex-start;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--max), calc(100% - 28px));
  }

  .card-grid,
  .product-grid,
  .stat-grid,
  .footer-grid,
  .steps,
  .logo-grid,
  .form-row,
  .split,
  .check-list li {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

  .hero-meta {
    flex-direction: column;
    gap: 12px;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ===== V3 简洁企业 ===== */
:root {
  --ink: #1a3344;
  --ink-2: #224155;
  --ink-3: #2c5368;
  --paper: #f5f7f8;
  --paper-2: #e8eef0;
  --copper: #1f7a6c;
  --copper-2: #2a9a88;
  --steel: #6a7f8a;
  --mist: #5d7380;
  --line: rgba(26, 51, 68, 0.1);
  --line-dark: rgba(255, 255, 255, 0.12);
  --shadow: 0 10px 28px rgba(26, 51, 68, 0.07);
  --font-display: "Source Sans 3", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Source Sans 3", "Noto Sans SC", "PingFang SC", sans-serif;
}

body {
  background: var(--paper);
}

.site-header {
  background: #fff;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.nav a {
  color: #5d7380;
}

.nav a:hover,
.nav a.is-active {
  color: var(--ink);
  border-bottom-color: var(--copper);
}

.brand-en {
  color: var(--copper);
}

.lang {
  border-color: var(--line);
}

.lang button {
  color: #5d7380;
}

.lang button.is-active {
  background: var(--copper);
  color: #fff;
}

.menu-btn {
  color: var(--ink);
  border-color: var(--line);
}

.hero {
  background: linear-gradient(180deg, #ffffff 0%, #eef3f5 100%);
  color: var(--ink);
}

.hero::after {
  display: none;
}

.hero-grid {
  min-height: 70vh;
  padding-top: 48px;
}

.hero-art {
  opacity: 0.45;
  filter: grayscale(1) contrast(1.1);
}

.hero .lead {
  color: #4d6270;
}

.hero-meta {
  border-top-color: var(--line);
}

.hero-meta b {
  color: var(--copper);
}

.hero-meta span {
  color: #5d7380;
}

.btn-copper {
  background: var(--copper);
  color: #fff;
  border-radius: 6px;
}

.btn-copper:hover {
  background: var(--copper-2);
}

.btn,
.btn-dark {
  border-radius: 6px;
}

.card,
.product-card,
.panel,
.logo-plate,
.steps li {
  border-radius: 10px;
  box-shadow: var(--shadow);
  background: #fff;
}

.icon-frame {
  background: var(--ink);
  border-color: var(--copper);
  border-radius: 8px;
}

.band {
  background: var(--ink);
}

.page-hero {
  background: var(--ink);
  border-bottom: 0;
}

.cta-strip {
  background: var(--ink-2);
}

.kicker {
  color: var(--copper);
}

.ver-tag {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 40;
  background: var(--copper);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 8px 12px;
  border-radius: 6px;
}

.logo-plate {
  min-height: 112px;
  padding: 16px 12px 12px;
  gap: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.logo-plate img {
  max-height: 44px;
  max-width: 86%;
  width: auto;
  height: auto;
  object-fit: contain;
}
.logo-plate span {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  opacity: 0.72;
}
.logo-plate--dark {
  background: #111;
  color: #f3efe6;
}

.brand img {
  width: auto;
  height: 52px;
  max-width: 168px;
  object-fit: contain;
}
.site-footer .brand img {
  filter: brightness(0) invert(1);
  opacity: 0.95;
}