:root {
  --bg-deep: #041b32;
  --bg-dark: #071f3b;
  --bg-mid: #0c2d52;
  --panel: rgba(13, 48, 83, 0.72);
  --panel-strong: rgba(8, 26, 48, 0.95);
  --primary: #2d7ef7;
  --primary-2: #56bdfd;
  --primary-3: #1d4ed8;
  --accent: #7dd3fc;
  --text: #e7f1ff;
  --muted: #b9d3f4;
  --card: #ffffff;
  --shadow: 0 24px 50px rgba(5, 24, 44, 0.28);
  --radius: 26px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(88, 148, 255, 0.28), transparent 33%),
    linear-gradient(180deg, #051827 0%, #0a2240 20%, #071d36 100%);
  color: var(--text);
  font-family: "Inter", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

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

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.section-padding {
  padding: 90px 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(5, 20, 37, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(125, 211, 252, 0.15);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 86px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 160px;
  color: #eef9ff;
  font-weight: 700;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, #81ecff, #4aa8ff 65%, #1d4ed8);
  box-shadow: 0 10px 22px rgba(60, 135, 255, 0.38);
  color: #031d32;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.brand-text {
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 1rem;
}

.nav-menu a {
  position: relative;
  color: rgba(233, 246, 255, 0.9);
  transition: color 0.2s ease;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-2), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: #ffffff;
}

.nav-menu a:hover::after,
.nav-menu a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 34px;
  height: 28px;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 3px;
  border-radius: 3px;
  background: #edf8ff;
}

.hero-section {
  position: relative;
  padding: 140px 0 60px;
  background:
    radial-gradient(circle at 50% 25%, rgba(84, 178, 255, 0.18), transparent 38%),
    linear-gradient(180deg, rgba(8, 30, 52, 0.9), rgba(11, 34, 59, 0.88));
}

.hero-inner {
  text-align: center;
}

.hero-section h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4.2rem);
  line-height: 1.15;
  letter-spacing: 0.04em;
  color: #eaf6ff;
  text-shadow: 0 10px 26px rgba(56, 138, 255, 0.2);
}

.featured-section {
  padding: 0 0 30px;
  margin-top: -18px;
  position: relative;
  z-index: 2;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.feature-card {
  background: linear-gradient(180deg, rgba(204, 225, 244, 0.9), rgba(181, 210, 235, 0.82));
  border: 1px solid rgba(144, 190, 255, 0.38);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px 26px;
  text-align: center;
  color: #0a2240;
}

.product-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  margin-bottom: 18px;
  padding: 12px;
}

.product-visual img {
  width: min(100%, 224px);
  height: 160px;
  object-fit: contain;
  border-radius: 28px;
  overflow: hidden;
}

.feature-card h3 {
  margin: 0 0 18px;
  font-weight: 700;
  font-size: clamp(1.4rem, 2vw, 2rem);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 136px;
  min-height: 40px;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-3));
  color: #fff;
  box-shadow: 0 10px 26px rgba(30, 94, 216, 0.35);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.hint {
  margin: 16px 0 0;
  font-size: 0.98rem;
  line-height: 1.7;
  color: rgba(10, 34, 64, 0.76);
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 40px;
}

.section-title-wrap h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  color: #edf7ff;
  letter-spacing: 0.02em;
}

.services-section {
  background: rgba(9, 29, 49, 0.65);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.service-card {
  background: linear-gradient(180deg, rgba(206, 226, 244, 0.9), rgba(190, 214, 236, 0.78));
  border: 1px solid rgba(148, 197, 255, 0.28);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: 0 18px 45px rgba(5, 22, 40, 0.18);
  color: #082847;
  overflow: hidden;
}

.service-head {
  padding: 22px 22px 8px;
}

.service-head h5 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.service-head p {
  margin: 0;
  color: rgba(8, 40, 71, 0.75);
  line-height: 1.7;
}

.service-art {
  width: 100%;
  height: 260px;
  background: linear-gradient(180deg, rgba(203, 236, 255, 0.18), rgba(109, 164, 255, 0.06));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px 0;
}

.service-art svg {
  width: 100%;
  height: 100%;
  display: block;
}

.advantage-section {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(8, 27, 48, 0.8), rgba(12, 37, 63, 0.96));
}

.section-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(84, 178, 255, 0.18), transparent 42%);
  pointer-events: none;
}

.advantage-inner {
  position: relative;
  z-index: 1;
}

.timeline-wrap {
  max-width: 980px;
  margin: 0 auto;
}

.timeline-list {
  position: relative;
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 31px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(125, 211, 252, 0.2), rgba(125, 211, 252, 0.9), rgba(125, 211, 252, 0.2));
}

.timeline-list li {
  position: relative;
  display: flex;
  gap: 22px;
  align-items: flex-start;
  padding-left: 72px;
}

.icon-holder {
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(56, 161, 255, 0.3), rgba(98, 255, 214, 0.2));
  border: 1px solid rgba(168, 230, 255, 0.5);
  box-shadow: 0 10px 20px rgba(24, 82, 151, 0.25);
}

.icon-holder span {
  font-size: 1.6rem;
  color: #dff8ff;
  line-height: 1;
}

.timeline-content {
  flex: 1;
  background: rgba(11, 35, 61, 0.52);
  border: 1px solid rgba(125, 211, 252, 0.12);
  border-radius: 20px;
  padding: 18px 22px 20px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.timeline-content h4 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 2vw, 2rem);
  color: #eefaff;
}

.timeline-content p {
  margin: 0;
  color: rgba(228, 239, 255, 0.8);
  line-height: 1.8;
}

.site-footer {
  background: rgba(4, 16, 29, 0.96);
  border-top: 1px solid rgba(125, 211, 252, 0.15);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.1fr 1.8fr;
  gap: 28px;
  align-items: start;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  margin-top: 8px;
}

.footer-brand-link .brand-mark {
  width: 32px;
  height: 32px;
  font-size: 0.72rem;
}

.footer-brand-link .brand-text {
  font-size: 0.96rem;
}

.footer-column h6 {
  margin: 0 0 18px;
  font-size: 1.1rem;
  color: #eaf7ff;
  letter-spacing: 0.04em;
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-column a,
.footer-column p {
  color: rgba(215, 230, 248, 0.82);
  line-height: 1.8;
  margin: 0;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: #ffffff;
}

.legal p + p {
  margin-top: 12px;
}

.record-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.record-row img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.feedback-page main {
  padding-top: 60px;
  padding-bottom: 80px;
}

.feedback-panel {
  max-width: 760px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(125, 211, 252, 0.16);
  border-radius: 26px;
  padding: 34px 28px;
  box-shadow: 0 20px 45px rgba(1, 12, 22, 0.18);
}

.form-field {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
}

.form-field label {
  color: #ebf7ff;
  font-weight: 600;
}

.form-field input,
.form-field textarea {
  width: 100%;
  border: 1px solid rgba(135, 200, 255, 0.3);
  background: rgba(9, 26, 45, 0.72);
  color: #edf7ff;
  border-radius: 14px;
  padding: 14px 16px;
  font: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: rgba(96, 172, 255, 0.9);
  box-shadow: 0 0 0 3px rgba(96, 172, 255, 0.18);
}

.form-field textarea {
  min-height: 160px;
  resize: vertical;
}

.submit-btn {
  border: none;
  cursor: pointer;
  width: 100%;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-3));
  color: #fff;
  padding: 14px 18px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 0 12px 24px rgba(32, 103, 221, 0.32);
}

@media (max-width: 960px) {
  .product-grid,
  .service-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    gap: 24px;
  }
}

@media (max-width: 700px) {
  .nav {
    position: relative;
    min-height: 72px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    background: rgba(8, 22, 37, 0.94);
    padding: 18px 20px;
    border: 1px solid rgba(125, 211, 252, 0.12);
    border-radius: 16px;
    box-shadow: 0 18px 32px rgba(3, 9, 15, 0.42);
  }

  .nav-menu.active {
    display: flex;
  }

  .hero-section {
    padding-top: 110px;
  }

  .timeline-list li {
    padding-left: 58px;
  }

  .icon-holder {
    width: 54px;
    height: 54px;
  }
}