:root {
  --zs-primary: #0f3567;
  --zs-accent: #4f85f5;
  --zs-text: #1f2937;
  --zs-muted: #4b5563;
  --zs-border: #e5e7eb;
  --zs-soft: #f5f8fd;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: var(--zs-text);
  background: #fff;
}

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

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

.zs-container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

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

.zs-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: #fff;
  border-bottom: 1px solid #d9dee5;
  box-shadow: 0 1px 0 rgba(15, 53, 103, 0.08);
}

.zs-header-main .zs-container {
  position: relative;
  padding-top: 2px;
}

.zs-header-topline {
  min-height: 52px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.zs-logo img {
  width: 122px;
  height: auto;
}

.zs-header-right {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.zs-header-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.zs-header-action-mail,
.zs-header-action-quote {
  height: 32px;
  border-radius: 2px;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #4f85f5;
}

.zs-header-action-mail {
  color: #4f85f5;
  background: #fff;
}

.zs-header-action-quote {
  color: #fff;
  background: #4f85f5;
  cursor: pointer;
}

.zs-menu-toggle {
  display: none;
  border: 1px solid var(--zs-border);
  background: #fff;
  padding: 10px 12px;
  border-radius: 4px;
  font-size: 14px;
}

.zs-nav {
  display: block;
  width: 100%;
}

.zs-nav > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.zs-nav a {
  font-size: 16px;
  font-weight: 600;
  color: #223244;
  position: relative;
  display: inline-flex;
  padding: 9px 0 12px;
  white-space: nowrap;
}

.zs-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--zs-primary);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}

.zs-nav a:hover::after,
.zs-nav a.is-active::after {
  transform: scaleX(1);
}

.zs-nav-item {
  position: relative;
}

.zs-nav-item--has-sub > a {
  padding-right: 16px;
}

.zs-nav-item--has-sub > a::before {
  content: "";
  position: absolute;
  right: 1px;
  top: 47%;
  width: 6px;
  height: 6px;
  border-right: 1.8px solid currentColor;
  border-bottom: 1.8px solid currentColor;
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.2s ease;
}

.zs-nav-submenu {
  list-style: none;
  margin: 0;
  padding: 8px 0;
  position: absolute;
  left: 0;
  top: 100%;
  min-width: 224px;
  background: #fff;
  border: 1px solid #e7ebf2;
  box-shadow: 0 14px 28px rgba(13, 29, 55, 0.12);
  display: none;
  z-index: 60;
}

.zs-nav-submenu a {
  width: 100%;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
}

.zs-nav-submenu a::after {
  display: none;
}

.zs-nav-item--has-sub:hover > .zs-nav-submenu,
.zs-nav-item--has-sub:focus-within > .zs-nav-submenu,
.zs-nav-item--has-sub.is-open > .zs-nav-submenu {
  display: block;
}

.zs-nav-item--has-sub:hover > a::before,
.zs-nav-item--has-sub:focus-within > a::before,
.zs-nav-item--has-sub.is-open > a::before {
  transform: translateY(-40%) rotate(225deg);
}

.zs-view-hero {
  min-height: 307px;
  display: flex;
  align-items: center;
  background: url("../img/phosphor-1.jpg") center/cover no-repeat;
}

.zs-view-hero h1 {
  margin: 0;
  color: #111111;
  font-size: clamp(26px, 2.4vw, 42px);
  line-height: 1.1;
  letter-spacing: 0;
  white-space: nowrap;
}

.zs-view-intro {
  padding-bottom: 0;
}

.zs-view-overview {
  padding-top: 36px;
  padding-bottom: 0;
}

.zs-view-overview-2 {
  padding-top: 32px;
}

.zs-view-intro h2 {
  margin: 0;
  text-align: center;
  font-size: clamp(30px, 3vw, 50px);
  color: #0f3567;
}

.zs-overview-title {
  margin: 0 0 20px;
  font-size: clamp(18px, 1.5vw, 28px);
  line-height: 1.15;
  color: #1f2937;
  text-align: center;
  white-space: nowrap;
}

.zs-overview-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 26px;
  align-items: center;
}

.zs-overview-grid p {
  margin: 0;
  line-height: 1.85;
  color: #374151;
  font-size: 17px;
}

.zs-overview-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 28px;
  align-items: center;
}

.zs-overview-grid-2 p {
  margin: 0;
  line-height: 1.85;
  color: #374151;
  font-size: 17px;
}

.zs-view-adv {
  background: #f4f6f9;
  color: #374151;
}

.zs-view-adv h3 {
  margin: 0 0 40px;
  font-size: clamp(30px, 2.8vw, 40px);
  text-align: center;
  color: #0f3567;
}

.zs-adv-list {
  display: flex;
  flex-direction: column;
}

.zs-adv-item {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
  padding: 30px 0;
  border-top: 2px solid #0f3567;
}

.zs-adv-item:last-child {
  border-bottom: 2px solid #0f3567;
}

.zs-adv-text h2 {
  margin: 0 0 16px;
  color: #0f3567;
  font-size: clamp(20px, 1.4vw, 24px);
  line-height: 1.3;
  text-transform: uppercase;
}

.zs-adv-text p {
  margin: 0;
  color: #6b7280;
  line-height: 1.7;
  font-size: 15px;
}

.zs-adv-img img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.zs-view-apps h3 {
  margin: 0 0 32px;
  text-align: center;
  color: #0f3567;
  font-size: clamp(30px, 2.8vw, 46px);
}

.zs-apps-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px 60px;
}

.zs-app-card {
  border: none;
  border-radius: 10px;
  overflow: hidden;
  background: transparent;
}

.zs-app-card h2 {
  margin: 20px 0 12px;
  font-size: clamp(22px, 1.8vw, 26px);
  line-height: 1.2;
  color: #0f3567;
  text-align: center;
}

.zs-app-card p {
  margin: 0;
  color: #6b7280;
  line-height: 1.8;
  font-size: 15px;
}

.zs-modal {
  position: fixed;
  inset: 0;
  background: rgba(7, 18, 35, 0.65);
  display: grid;
  place-items: center;
  z-index: 120;
  padding: 20px;
}

.zs-modal[hidden] {
  display: none;
}

.zs-modal-panel {
  width: min(560px, 96%);
  background: #fff;
  border-radius: 10px;
  padding: 28px 24px;
  position: relative;
}

.zs-modal-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  color: #374151;
}

.zs-modal-title {
  margin: 0 0 12px;
  color: #1f2937;
  font-size: 34px;
}

.zs-modal-desc {
  margin: 0;
  color: #4b5563;
  line-height: 1.8;
  font-size: 16px;
}

.zs-mt-12 {
  margin-top: 12px;
}

.zs-mt-16 {
  margin-top: 16px;
}

.zs-footer {
  background: #0f1e35;
  color: #d8deea;
}

.zs-footer-main {
  padding: 68px 0 34px;
}

.zs-footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 26px;
}

.zs-logo-small {
  width: 160px;
}

.zs-footer h4 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 18px;
}

.zs-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.zs-footer p,
.zs-footer li,
.zs-footer a {
  line-height: 1.8;
  font-size: 14px;
}

.zs-footer-social {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.zs-footer-social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 4px 10px;
  border-radius: 2px;
  color: #dbe5f4;
}

.zs-footer-social-link svg {
  width: 18px;
  height: 18px;
  fill: #4f85f5;
}

.zs-footer-contact-list li {
  display: grid;
  grid-template-columns: 18px 1fr;
  align-items: start;
  gap: 8px;
}

.zs-footer-contact-icon {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
  color: #4f85f5;
}

.zs-footer-contact-icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.zs-footer-copy {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 13px;
  color: #9ca3af;
  padding: 16px 0 18px;
}

@media (max-width: 1100px) {
  .zs-overview-title {
    white-space: normal;
  }

  .zs-overview-grid {
    grid-template-columns: 1fr;
  }

  .zs-overview-grid-2 {
    grid-template-columns: 1fr;
  }

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

  .zs-adv-item {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 0;
  }
}

@media (max-width: 920px) {
  .zs-header-main .zs-container {
    padding-top: 0;
  }

  .zs-header-topline {
    min-height: 64px;
    gap: 10px;
  }

  .zs-header-right {
    gap: 0;
  }

  .zs-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid var(--zs-border);
    box-shadow: 0 16px 28px rgba(13, 29, 55, 0.1);
  }

  .zs-nav.is-open {
    display: block;
  }

  .zs-nav > ul {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 18px;
    gap: 14px;
    justify-content: flex-start;
  }

  .zs-menu-toggle {
    display: inline-flex;
  }

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

  .zs-nav a {
    padding: 0;
  }

  .zs-nav a::after {
    display: none;
  }

  .zs-nav-item {
    width: 100%;
  }

  .zs-nav-item--has-sub > a {
    width: 100%;
    padding-right: 18px;
  }

  .zs-nav-item--has-sub > a::before {
    right: 4px;
  }

  .zs-nav-submenu {
    position: static;
    min-width: 0;
    box-shadow: none;
    border: 0;
    background: #f7f9fc;
    margin-top: 8px;
  }

  .zs-nav-submenu a {
    padding: 9px 12px;
    font-size: 14px;
  }
}

@media (max-width: 640px) {
  .zs-section {
    padding: 52px 0;
  }

  .zs-view-hero {
    min-height: 227px;
  }

  .zs-apps-grid,
  .zs-footer-grid {
    grid-template-columns: 1fr;
  }

  .zs-app-card h2 {
    font-size: 24px;
  }
}