/* Chuanxingda corporate website styles - Lynk-inspired edition */
:root {
  --bg: #050505;
  --bg-soft: #0b0b0b;
  --bg-panel: #111111;
  --line: rgba(255, 255, 255, 0.2);
  --line-strong: rgba(255, 255, 255, 0.42);
  --text: #f2f2f2;
  --text-soft: #b6b6b6;
  --accent: #8fd6ff;
  --ok: #95e6bf;
  --danger: #ff8a8a;
  --shadow: 0 16px 46px rgba(0, 0, 0, 0.5);
  --radius-xl: 10px;
  --radius-lg: 6px;
  --radius-sm: 3px;
  --container: 1280px;
  --duration-fast: 180ms;
  --duration-mid: 420ms;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 8% 0%, rgba(143, 214, 255, 0.12), transparent 30%),
    radial-gradient(circle at 95% 92%, rgba(143, 214, 255, 0.07), transparent 38%),
    #040404;
  background-size: 40px 40px, 40px 40px, auto, auto, auto;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

p {
  line-height: 1.74;
  color: var(--text-soft);
  margin: 0 0 1rem;
  font-size: 1.02rem;
}

h1,
h2,
h3,
h4 {
  font-family: "Barlow Condensed", "Arial Narrow", sans-serif;
  letter-spacing: 0.04em;
  margin: 0 0 0.8rem;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 6.4rem);
  line-height: 0.96;
}

h2 {
  font-size: clamp(1.9rem, 4.1vw, 3.4rem);
  line-height: 1.02;
}

h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.58rem);
  line-height: 1.12;
}

.container {
  width: min(93vw, var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(5, 5, 5, 0.78);
  border-bottom: 1px solid var(--line);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.brand img {
  width: 42px;
  height: 42px;
  filter: grayscale(1) contrast(1.15);
}

.brand span {
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.55rem 0.2rem;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast), border-color var(--duration-fast), opacity var(--duration-fast);
  opacity: 0.88;
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffffff;
  opacity: 1;
  border-color: var(--accent);
}

.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 0;
  cursor: pointer;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 86vh;
  display: grid;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero::before {
  background:
    linear-gradient(103deg, rgba(0, 0, 0, 0.92) 18%, rgba(0, 0, 0, 0.48) 56%, rgba(0, 0, 0, 0.9) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 40%);
  z-index: 1;
}

.hero::after {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 110px 110px;
  opacity: 0.25;
  z-index: 2;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.1) grayscale(0.15);
  transform: scale(1.03);
  animation: heroZoom 12s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1.01); }
  to { transform: scale(1.07); }
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 900px;
  padding: 6rem 0;
}

.kicker {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.74rem;
  color: var(--accent);
  margin-bottom: 1rem;
  border-left: 2px solid var(--accent);
  padding-left: 0.6rem;
}

.hero .lead {
  font-size: clamp(1.03rem, 1.7vw, 1.28rem);
  color: #d6d6d6;
  max-width: 720px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.76rem 1.5rem;
  border-radius: 0;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: transform var(--duration-fast), background var(--duration-fast), color var(--duration-fast), border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: #f2f2f2;
  color: #050505;
  border-color: #f2f2f2;
}

.btn-primary:hover {
  box-shadow: 0 0 0 3px rgba(242, 242, 242, 0.18);
}

.btn-secondary {
  border-color: var(--line-strong);
  color: #f2f2f2;
  background: rgba(255, 255, 255, 0.02);
}

.btn-secondary:hover {
  border-color: #f2f2f2;
}

.section {
  padding: clamp(3.3rem, 6.6vw, 7rem) 0;
  position: relative;
}

.section-header {
  max-width: 820px;
  margin-bottom: 2.1rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

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

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

.card {
  background: linear-gradient(162deg, rgba(22, 22, 22, 0.92), rgba(12, 12, 12, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: border-color var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
}

.card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(143, 214, 255, 0.7), transparent);
}

.card::after {
  content: "";
  position: absolute;
  bottom: -55px;
  right: -55px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle at center, rgba(143, 214, 255, 0.16), transparent 70%);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 20px 42px rgba(0, 0, 0, 0.58);
}

.card-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 0.9rem;
  filter: grayscale(0.15) contrast(1.2);
}

.card p,
.card li {
  font-size: 0.99rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
}

.metric {
  text-align: center;
  background: #0f0f0f;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.metric strong {
  display: block;
  font-family: "Barlow Condensed", "Arial Narrow", sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: 0.05em;
  color: #ffffff;
}

.metric span {
  color: #c8c8c8;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.74rem;
}

.timeline {
  position: relative;
  padding-left: 1.2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(rgba(143, 214, 255, 0.86), rgba(255, 255, 255, 0.3));
}

.timeline-item {
  position: relative;
  margin: 0 0 1.4rem;
  padding-left: 1.1rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.media-panel {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.media-panel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.05) saturate(0.86);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.88rem;
}

.contact-list li {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  font-size: 1rem;
  color: #d7d7d7;
}

.contact-list svg {
  width: 20px;
  height: 20px;
  margin-top: 0.2rem;
  flex: 0 0 20px;
}

.contact-form {
  display: grid;
  gap: 0.55rem;
  margin-top: 1rem;
}

.contact-form label {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #d0d0d0;
  margin-top: 0.3rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: #f2f2f2;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 0.95rem;
  padding: 0.72rem 0.82rem;
  border-radius: 0;
  outline: none;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.contact-form textarea {
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--line-strong);
  box-shadow: 0 0 0 2px rgba(143, 214, 255, 0.13);
}

.policy {
  background: linear-gradient(165deg, rgba(14, 14, 14, 0.98), rgba(9, 9, 9, 0.98));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow);
}

.policy h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.policy h3 {
  margin-top: 1.4rem;
  margin-bottom: 0.6rem;
}

.policy ul {
  margin-top: 0;
  margin-bottom: 1rem;
  padding-left: 1.2rem;
  color: var(--text-soft);
}

.policy li {
  margin-bottom: 0.45rem;
}

.notice {
  border-left: 2px solid var(--accent);
  padding: 0.8rem 1rem;
  margin: 1rem 0;
  background: rgba(143, 214, 255, 0.09);
}

.page-banner {
  position: relative;
  min-height: 42vh;
  display: grid;
  align-items: end;
  padding: 0 0 2.2rem;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-banner .hero-bg img {
  animation-duration: 16s;
}

.page-banner .container {
  position: relative;
  z-index: 3;
}

.site-footer {
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
  background: rgba(5, 5, 5, 0.98);
}

.footer-grid {
  padding: 2.1rem 0 1.4rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1.2rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-links a {
  color: #d8d8d8;
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 1rem 0 1.2rem;
  color: #9e9e9e;
  font-size: 0.94rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-mid) ease, transform var(--duration-mid) ease;
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-mid) ease, transform var(--duration-mid) ease;
}

.stagger.in > * {
  opacity: 1;
  transform: translateY(0);
}

.stagger.in > *:nth-child(1) { transition-delay: 0.04s; }
.stagger.in > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.in > *:nth-child(3) { transition-delay: 0.16s; }
.stagger.in > *:nth-child(4) { transition-delay: 0.22s; }
.stagger.in > *:nth-child(5) { transition-delay: 0.28s; }
.stagger.in > *:nth-child(6) { transition-delay: 0.34s; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #ffffff;
  color: #000000;
  padding: 0.6rem 0.9rem;
  z-index: 2000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

@media (max-width: 980px) {
  .grid-3,
  .grid-2,
  .metrics,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    min-height: 76vh;
  }

  .nav-links {
    position: absolute;
    right: 1rem;
    top: 76px;
    min-width: 236px;
    flex-direction: column;
    align-items: stretch;
    background: rgba(7, 7, 7, 0.98);
    border: 1px solid var(--line);
    border-radius: 0;
    padding: 0.5rem;
    transform: scale(0.98) translateY(-14px);
    opacity: 0;
    pointer-events: none;
    transition: var(--duration-fast);
  }

  .nav-links.show {
    opacity: 1;
    pointer-events: all;
    transform: scale(1) translateY(0);
  }

  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 680px) {
  p {
    font-size: 0.97rem;
  }

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

  .hero-content {
    padding: 4.8rem 0 3.8rem;
  }

  .btn {
    width: 100%;
  }
}