/* ===== Design Tokens ===== */
:root {
  --bg-dark:       #060e1c;
  --bg-section:    #0a1f3d;
  --bg-card:       #0d2040;
  --accent:        #7ec820;
  --accent-hover:  #5da012;
  --text-primary:  #ffffff;
  --text-muted:    rgba(255, 255, 255, 0.55);
  --text-dim:      rgba(255, 255, 255, 0.3);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --container:     1200px;
  --radius:        12px;
  --transition:    0.25s ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 72px;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===== Container ===== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Fade-up animation ===== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Section common ===== */
.section { padding: 100px 0; }
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 600px;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header .section-subtitle { margin: 0 auto; }

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background var(--transition), backdrop-filter var(--transition);
}
.navbar.scrolled {
  background: var(--bg-dark);
  background: rgba(6, 14, 28, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.navbar__logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.navbar__links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}
.navbar__cta {
  padding: 9px 22px;
  background: var(--accent);
  color: var(--bg-dark);
  font-size: 0.88rem;
  font-weight: 700;
  border-radius: 8px;
  transition: background var(--transition), transform var(--transition);
}
.navbar__cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.nav-link:focus-visible,
.navbar__cta:focus-visible,
.navbar__hamburger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Hamburger */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.navbar__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition), opacity var(--transition);
}
.navbar__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__hamburger.open span:nth-child(2) { opacity: 0; }
.navbar__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .navbar__hamburger { display: flex; }
  .navbar__links {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
  }
  .navbar__links.open { display: flex; }
  .nav-link { font-size: 1.2rem; }
}

/* ===== Buttons (shared) ===== */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition), border-color var(--transition), color var(--transition);
  cursor: pointer;
}
.btn--primary {
  background: var(--accent);
  color: var(--bg-dark);
}
.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}
.btn--outline {
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: var(--text-primary);
}
.btn--outline:hover {
  border-color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(160deg, var(--bg-dark) 0%, #0a1f3d 100%);
  overflow: hidden;
  text-align: center;
  margin-top: -72px;
  padding-top: 72px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 38%, rgba(126, 200, 32, 0.12), transparent 28%),
    radial-gradient(circle at 18% 72%, rgba(42, 129, 151, 0.18), transparent 30%),
    linear-gradient(180deg, rgba(6, 14, 28, 0.2), rgba(6, 14, 28, 0.78));
  pointer-events: none;
  z-index: 0;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at center, black 0%, transparent 68%);
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}
.hero__glow {
  position: absolute;
  top: -80px;
  right: -80px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 200, 32, 0.12) 0%, transparent 65%);
  pointer-events: none;
  z-index: 1;
}
.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 0 24px;
}
.hero__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero__title {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -2px;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.hero__title--accent { color: var(--accent); }
.hero__desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 40px;
}
.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.hero__scroll-text {
  font-size: 0.65rem;
  letter-spacing: 3px;
  color: var(--text-dim);
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6) translateY(-8px); }
  50%       { opacity: 1;   transform: scaleY(1)   translateY(0);    }
}

/* Hero fade-up stagger */
.hero__eyebrow { transition-delay: 0.1s; }
.hero__title   { transition-delay: 0.2s; }
.hero__desc    { transition-delay: 0.3s; }
.hero__actions { transition-delay: 0.4s; }

/* ===== Stats ===== */
.stats {
  background: var(--bg-section);
  padding: 80px 0;
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat__number {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  color: var(--accent);
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 12px;
}
.stat__label {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== Products ===== */
.products { background: var(--bg-dark); }

.product-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 100px;
}
.product-row:last-child { margin-bottom: 0; }
.product-row--reverse .product-row__text { order: 2; }
.product-row--reverse .product-row__visual { order: 1; }

.product-tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  border-radius: 4px;
  margin-bottom: 20px;
}
.product-title {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}
.product-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}
.product-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}
.product-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 20px;
  position: relative;
}
.product-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.product-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
  transition: color var(--transition);
}
.product-link:hover { color: var(--accent); }
.product-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Product visual card */
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 40px 36px;
  transition: border-color var(--transition), transform var(--transition);
}
.product-card:hover {
  border-color: rgba(126, 200, 32, 0.3);
  transform: translateY(-4px);
}
.product-card__icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}
.product-card__name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.product-card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.product-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.product-card__tags span {
  padding: 4px 10px;
  background: rgba(126, 200, 32, 0.1);
  color: var(--accent);
  font-size: 0.75rem;
  border-radius: 4px;
}
.visual-asset {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  object-fit: cover;
}

@media (max-width: 1024px) {
  .product-row { grid-template-columns: 1fr; gap: 40px; }
  .product-row--reverse .product-row__text { order: 1; }
  .product-row--reverse .product-row__visual { order: 2; }
}

/* ===== Methodology ===== */
.methodology { background: var(--bg-section); }

.methodology__steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 24px;
  align-items: start;
}
.method-step__arrow {
  font-size: 1.5rem;
  color: var(--accent);
  align-self: center;
  padding-top: 40px;
}
.method-step__number {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 20px;
  letter-spacing: -2px;
}
.method-step__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.method-step__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
}

@media (max-width: 768px) {
  .methodology__steps {
    grid-template-columns: 1fr;
  }
  .method-step__arrow {
    display: none;
  }
}

/* ===== Solutions ===== */
.solutions { background: var(--bg-dark); }

.solutions__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 36px 28px;
  border-top: 3px solid transparent;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}
.solution-card:hover {
  transform: translateY(-4px);
  border-top-color: var(--accent);
}
.solution-card__icon {
  font-size: 2rem;
  margin-bottom: 18px;
}
.solution-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.solution-card__desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
  flex: 1;
  margin-bottom: 24px;
}
.solution-card__link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color var(--transition);
}
.solution-card__link:hover { color: var(--accent); }
.solution-card__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (max-width: 1024px) {
  .solutions__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .solutions__grid { grid-template-columns: 1fr; }
}

/* ===== About ===== */
.about { background: var(--bg-section); }

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about__desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 20px;
}
.about__keywords {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.keyword-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px 20px;
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition);
}
.keyword-item:hover { border-color: rgba(126, 200, 32, 0.25); }
.keyword-item__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.keyword-item__desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 1024px) {
  .about__inner { grid-template-columns: 1fr; gap: 48px; }
}
@media (max-width: 600px) {
  .about__keywords { grid-template-columns: 1fr; }
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: var(--accent);
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}
.cta-banner__glow {
  position: absolute;
  top: -60%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 65%);
  pointer-events: none;
}
.cta-banner__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.cta-banner__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: rgba(6, 14, 28, 0.7);
  margin-bottom: 20px;
}
.cta-banner__title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: var(--bg-dark);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.cta-banner__desc {
  font-size: 1.05rem;
  color: rgba(6, 14, 28, 0.65);
  margin-bottom: 40px;
  line-height: 1.7;
}
.cta-banner__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn--dark {
  background: var(--bg-dark);
  color: var(--text-primary);
}
.btn--dark:hover {
  background: #0a1f3d;
  transform: translateY(-2px);
}
.btn--dark-outline {
  border: 2px solid rgba(6, 14, 28, 0.4);
  color: var(--bg-dark);
}
.btn--dark-outline:hover {
  border-color: var(--bg-dark);
  background: rgba(6, 14, 28, 0.08);
}

/* ===== Contact ===== */
.contact { background: var(--bg-dark); }

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contact__subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-top: 16px;
  margin-bottom: 40px;
}
.contact__detail { display: flex; flex-direction: column; gap: 16px; }
.contact__item { display: flex; flex-direction: column; gap: 4px; }
.contact__label { font-size: 0.75rem; color: var(--text-dim); letter-spacing: 1px; }
.contact__value { font-size: 0.95rem; color: var(--text-primary); }

/* Form */
.contact__form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 0.82rem; color: var(--text-muted); font-weight: 600; }
.form-input {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
}
.form-input:focus { border-color: rgba(126, 200, 32, 0.5); }
.form-input.error { border-color: #ff4d4d; }
.form-textarea { resize: vertical; min-height: 120px; }
.form-error { font-size: 0.78rem; color: #ff4d4d; min-height: 16px; }
.form-submit { align-self: flex-start; }
.form-success {
  padding: 14px 20px;
  background: rgba(126, 200, 32, 0.1);
  border: 1px solid rgba(126, 200, 32, 0.3);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.9rem;
}

/* Footer */
.footer { background: var(--bg-dark); border-top: 1px solid var(--border-subtle); }
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 48px 24px;
  flex-wrap: wrap;
  gap: 24px;
}
.footer__logo {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.footer__slogan { font-size: 0.8rem; color: var(--text-dim); }
.footer__nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer__nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--accent); }
.footer__contact { font-size: 0.85rem; color: var(--text-muted); }
.footer__bottom {
  border-top: 1px solid var(--border-subtle);
  padding: 20px 24px;
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: center;
}

/* ===== Stagger delays for grid children ===== */
.stats__grid .stat:nth-child(1) { transition-delay: 0s; }
.stats__grid .stat:nth-child(2) { transition-delay: 0.1s; }
.stats__grid .stat:nth-child(3) { transition-delay: 0.2s; }
.stats__grid .stat:nth-child(4) { transition-delay: 0.3s; }

.solutions__grid .solution-card:nth-child(1) { transition-delay: 0s; }
.solutions__grid .solution-card:nth-child(2) { transition-delay: 0.1s; }
.solutions__grid .solution-card:nth-child(3) { transition-delay: 0.2s; }
.solutions__grid .solution-card:nth-child(4) { transition-delay: 0.3s; }

@media (max-width: 768px) {
  .contact__inner { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; text-align: center; }
  .footer__nav { justify-content: center; }
}

/* ===== Mobile final adjustments ===== */
@media (max-width: 480px) {
  .hero__title {
    letter-spacing: -1px;
  }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { text-align: center; justify-content: center; }
  .section { padding: 64px 0; }
  .methodology__steps { gap: 32px; }
  .product-row { margin-bottom: 60px; }
}