:root {
  color-scheme: dark;
  --bg: #050607;
  --bg-soft: #0d1113;
  --panel: #11171a;
  --panel-line: #263036;
  --text: #f4f7f7;
  --muted: #aab5b8;
  --subtle: #7d8b90;
  --cyan: #45e0d3;
  --silver: #d7dcde;
  --warm: #c7bba4;
  --line: rgba(255, 255, 255, 0.12);
  --max: 1180px;
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

#about,
#contact {
  scroll-margin-top: 72px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

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

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

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 6, 7, 0.78);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 38px;
  height: 38px;
  object-fit: cover;
  border-radius: 6px;
}

.brand-name {
  display: grid;
  gap: 2px;
}

.brand-name strong {
  font-size: 16px;
  font-weight: 700;
}

.brand-name span {
  font-size: 12px;
  color: var(--muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  padding: 10px 0;
  border-bottom: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  border-color: var(--cyan);
}

.lang-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: 4px;
}

.lang-switch select {
  min-height: 32px;
  max-width: 112px;
  padding: 0 28px 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 650;
  cursor: pointer;
  appearance: none;
}

.lang-switch::after {
  content: "";
  position: absolute;
  right: 10px;
  width: 7px;
  height: 7px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  color: var(--muted);
  pointer-events: none;
  transform: rotate(45deg) translateY(-2px);
}

.lang-switch select:hover,
.lang-switch select:focus {
  border-color: var(--cyan);
  color: var(--text);
  outline: none;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 22px;
}

.hero {
  min-height: 92vh;
  position: relative;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(69, 224, 211, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(69, 224, 211, 0.08) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 70%, transparent);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 72px 0 0 0;
  background:
    linear-gradient(90deg, rgba(5, 6, 7, 0.96) 0%, rgba(5, 6, 7, 0.74) 42%, rgba(5, 6, 7, 0.96) 100%),
    url("assets/simatrix-logo.png") center right 10% / min(560px, 58vw) no-repeat;
  opacity: 0.92;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 40px));
  margin: 88px auto 0;
  padding: 90px 0 84px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 650;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--cyan);
}

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

.hero h1 {
  margin-top: 24px;
  max-width: 760px;
  font-size: clamp(42px, 7vw, 88px);
  line-height: 1.02;
  font-weight: 760;
}

.hero-copy {
  margin-top: 28px;
  max-width: 680px;
  color: var(--silver);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.72;
}

.hero-actions {
  margin-top: 38px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  font-weight: 650;
  white-space: nowrap;
}

.button.primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #02110f;
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.section {
  border-bottom: 1px solid var(--line);
}

.section-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 92px 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 44px;
}

.section-kicker {
  color: var(--cyan);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section h2 {
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.12;
}

.section-lead {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.78;
}

.band-dark {
  background: var(--bg-soft);
}

.grid-3,
.grid-4,
.grid-2 {
  display: grid;
  gap: 18px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.card {
  border: 1px solid var(--panel-line);
  border-radius: 8px;
  background: rgba(17, 23, 26, 0.84);
  padding: 24px;
}

.card-number {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 760;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 20px;
  line-height: 1.35;
  margin-bottom: 14px;
}

.card p,
.card li {
  color: var(--muted);
  line-height: 1.72;
  font-size: 15px;
}

.card ul {
  margin: 0;
  padding-left: 18px;
}

.capability-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) minmax(260px, 0.72fr);
  gap: 28px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.capability-row:last-child {
  border-bottom: 1px solid var(--line);
}

.capability-row strong {
  color: var(--cyan);
  font-size: 14px;
}

.capability-row h3 {
  font-size: 24px;
}

.capability-row p {
  color: var(--muted);
  line-height: 1.75;
}

.quote-band {
  background: #e7ebe9;
  color: #101516;
}

.quote-band .section-inner {
  padding: 74px 0;
}

.quote {
  max-width: 920px;
  font-size: clamp(28px, 4.5vw, 58px);
  line-height: 1.18;
  font-weight: 760;
}

.quote-caption {
  margin-top: 24px;
  color: #4d5b5d;
}

.timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.timeline-item span {
  color: var(--cyan);
  font-weight: 760;
}

.timeline-item p {
  color: var(--muted);
  line-height: 1.75;
}

.page-hero {
  padding-top: 72px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(5, 6, 7, 0.96), rgba(5, 6, 7, 0.82)),
    url("assets/simatrix-logo.png") center right 12% / min(420px, 50vw) no-repeat;
}

.page-hero .section-inner {
  padding: 112px 0 88px;
}

.page-hero h1 {
  max-width: 800px;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.08;
}

.page-hero p {
  max-width: 720px;
  margin-top: 24px;
  color: var(--silver);
  font-size: 19px;
  line-height: 1.78;
}

.contact-panel {
  display: block;
}

.info-list {
  display: grid;
  gap: 14px;
  width: min(760px, 100%);
  margin-left: auto;
}

.info-line {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.info-line strong {
  color: var(--text);
}

.site-footer {
  background: #030404;
}

.footer-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 40px 0;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--subtle);
  font-size: 13px;
}

@media (max-width: 900px) {
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 14px 20px 20px;
    background: rgba(5, 6, 7, 0.96);
    border-bottom: 1px solid var(--line);
  }

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

  .nav-links a {
    padding: 14px 0;
  }

  .lang-switch {
    margin: 12px 0 0;
    padding-top: 14px;
    border-top: 1px solid var(--line);
  }

  .lang-switch select {
    width: 100%;
    max-width: none;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .hero::after,
  .page-hero {
    background:
      linear-gradient(90deg, rgba(5, 6, 7, 0.96), rgba(5, 6, 7, 0.84)),
      url("assets/simatrix-logo.png") center 28% / min(440px, 86vw) no-repeat;
  }

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

  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .capability-row,
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

@media (max-width: 560px) {
  .nav {
    width: min(var(--max), calc(100% - 28px));
  }

  .brand-name span {
    display: none;
  }

  .hero-inner,
  .section-inner,
  .footer-inner {
    width: min(var(--max), calc(100% - 28px));
  }

  .hero-inner {
    padding: 72px 0 64px;
  }

  .section-inner {
    padding: 68px 0;
  }

  .info-line {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .info-list {
    margin-left: 0;
  }

  .footer-inner {
    flex-direction: column;
  }
}