:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --bg-dark: #0b1020;
  --bg-dark-2: #101735;
  --text: #1a2233;
  --text-soft: #5b6478;
  --text-light: #f4f6fb;
  --text-muted: #9aa3b8;
  --border: #e6eaf2;
  --primary: #4f46e5;
  --primary-2: #7c3aed;
  --accent: #22d3ee;
  --gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #22d3ee 120%);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 24px 60px rgba(79, 70, 229, 0.16);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-eyebrow {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 38px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.section-desc {
  margin-top: 14px;
  color: var(--text-soft);
  font-size: 17px;
  max-width: 620px;
}

.section-head {
  text-align: center;
  margin-bottom: 56px;
}

.section-head .section-desc {
  margin-left: auto;
  margin-right: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 26px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 12px 32px rgba(79, 70, 229, 0.45);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.16);
}

.btn-outline {
  border-color: var(--border);
  color: var(--text);
  background: #fff;
}

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

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}

.site-header.scrolled {
  background: rgba(11, 16, 32, 0.85);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4);
}

.brand-mark svg {
  width: 24px;
  height: 24px;
}

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

.brand-text strong {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-text small {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.brand-light .brand-text small {
  color: var(--text-soft);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  position: relative;
  overflow: hidden;
  background: var(--bg-dark);
  color: #fff;
  padding: 190px 0 90px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 75%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}

.hero-glow-a {
  width: 520px;
  height: 520px;
  background: rgba(79, 70, 229, 0.55);
  top: -180px;
  right: -120px;
}

.hero-glow-b {
  width: 460px;
  height: 460px;
  background: rgba(34, 211, 238, 0.35);
  bottom: -180px;
  left: -140px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
}

.hero-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 999px;
  padding: 7px 18px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: 60px;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(120deg, #ffffff 30%, #c7d2fe 70%, #67e8f9 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 19px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
  max-width: 640px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 720px;
  margin: 0 auto;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat strong {
  font-size: 34px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14.5px;
  color: var(--text-soft);
}

.section-products {
  background: var(--bg-soft);
}

.product-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
}

.tab-btn {
  padding: 10px 28px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tab-btn.active {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 8px 22px rgba(79, 70, 229, 0.32);
}

.product-grid {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-grid.active {
  display: grid;
  animation: fadeUp 0.45s ease;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.product-card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: #eef1f8;
  overflow: hidden;
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-media img {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(11, 16, 32, 0.72);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 6px 14px;
  border-radius: 999px;
  backdrop-filter: blur(6px);
}

.product-body {
  padding: 24px 24px 22px;
}

.product-body h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
}

.product-body > p {
  font-size: 14.5px;
  color: var(--text-soft);
  margin-bottom: 16px;
}

.product-specs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.product-specs li {
  font-size: 12.5px;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 999px;
}

.product-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.product-price {
  font-size: 17px;
  font-weight: 800;
  color: var(--primary);
}

.section-solutions {
  background: var(--bg-dark);
  color: #fff;
}

.section-solutions .section-eyebrow {
  color: var(--accent);
}

.section-solutions .section-title {
  color: #fff;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.solution-card {
  position: relative;
  background: var(--bg-dark-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 34px 28px 30px;
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.solution-card:hover {
  transform: translateY(-6px);
  border-color: rgba(124, 58, 237, 0.6);
  background: linear-gradient(160deg, rgba(79, 70, 229, 0.2), rgba(11, 16, 32, 0.4));
}

.solution-num {
  position: absolute;
  top: 14px;
  right: 20px;
  font-size: 54px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.06);
  line-height: 1;
}

.solution-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
}

.solution-card p {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.68);
  margin-bottom: 22px;
  position: relative;
}

.solution-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  position: relative;
  transition: color 0.2s ease;
}

.solution-link:hover {
  color: #fff;
}

.section-about {
  background: var(--bg);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.about-media {
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 24px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.about-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 400px;
}

.about-text {
  color: var(--text-soft);
  font-size: 16px;
  margin-top: 18px;
}

.about-points {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-point {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
}

.about-point svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
  flex-shrink: 0;
}

.section-contact {
  background: var(--bg-soft);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 34px;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-list li div {
  display: flex;
  flex-direction: column;
}

.contact-list small {
  font-size: 12.5px;
  color: var(--text-muted);
}

.contact-list strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.contact-form-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 38px;
  box-shadow: var(--shadow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 7px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 96px;
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.form-tip {
  font-size: 12.5px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 14px;
}

.site-footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand p {
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  max-width: 320px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14.5px;
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer-col a,
.footer-col span {
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  padding-bottom: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.45);
}

.feature-card.revealed,
.solution-card.revealed,
.about-inner.revealed,
.contact-form-card.revealed {
  animation: fadeUp 0.6s ease backwards;
}

.btn-primary.submitted {
  background: linear-gradient(135deg, #10b981, #34d399);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.35);
}

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

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

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

  .about-inner {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .about-media img {
    min-height: 320px;
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .hero {
    padding: 150px 0 64px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 0 24px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 16px;
  }

  .main-nav {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(11, 16, 32, 0.97);
    backdrop-filter: blur(14px);
    padding: 18px 24px 28px;
    gap: 4px;
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .nav-link {
    padding: 13px 14px;
    font-size: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .header-actions .btn {
    display: none;
  }

  .feature-grid,
  .product-grid,
  .product-grid.active,
  .solution-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .contact-form-card {
    padding: 26px 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}