/* ========== Layout ========== */
.container {
  width: min(1280px, calc(100% - 64px));
  margin-inline: auto;
  box-sizing: border-box;
}

.section {
  padding-block: var(--section-y);
}

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

.section__head {
  max-width: 640px;
  margin-bottom: clamp(2.25rem, 4.5vw, 3.25rem);
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.section__head--center .section__desc {
  margin-inline: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-primary-hover);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
}

.section__title {
  font-size: var(--text-h2);
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: -0.03em;
  line-height: 1.22;
  margin-bottom: 0.95rem;
  text-wrap: balance;
}

.section__desc {
  font-size: 1.03rem;
  color: var(--color-text);
  line-height: 1.82;
  max-width: var(--read-max);
  text-wrap: pretty;
}

/* ========== Buttons & tags ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 48px;
  padding: 0.72rem 1.55rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  border: 1px solid transparent;
  transition:
    background var(--base) var(--ease),
    color var(--base) var(--ease),
    border-color var(--base) var(--ease),
    box-shadow var(--base) var(--ease),
    transform var(--base) var(--ease);
  white-space: nowrap;
  cursor: pointer;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 12px 28px rgba(76, 169, 222, 0.26);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(47, 147, 200, 0.3);
}

.btn--primary:active,
.btn--secondary:active {
  transform: translateY(1px) scale(0.98);
  box-shadow: none;
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-heading);
  border-color: var(--color-border);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.btn--secondary:hover {
  border-color: rgba(76, 169, 222, 0.55);
  color: var(--color-primary-hover);
  background: #fbfdff;
}

.btn--full {
  width: 100%;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.tag-soft {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-primary-dark);
  background: var(--color-primary-soft);
  border: 1px solid rgba(85, 181, 229, 0.22);
  white-space: nowrap;
}

.text-link {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--color-primary-hover);
  transition: color var(--fast) var(--ease);
}

.text-link:hover {
  color: var(--color-primary-dark);
}

/* ========== Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--base) var(--ease), box-shadow var(--base) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-nav);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 1rem;
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}

.nav__logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 10px;
}

.nav__logo-text {
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-heading);
}

.nav__menu {
  display: none;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: nowrap;
  min-width: 0;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.22rem;
  padding: 0.4rem 0.55rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  min-height: 42px;
  position: relative;
  background: none;
  border: none;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--fast) var(--ease);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link.is-active,
.nav__link[aria-current="true"] {
  color: var(--color-heading);
}

.nav__link.is-active::after,
.nav__link[aria-current="true"]::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  bottom: 0.3rem;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
}

/* 无真实页面时的一级项：不可跳转 */
.nav__link--static {
  cursor: default;
  color: var(--color-text);
}

.nav__link--static:hover {
  color: var(--color-text);
}

.nav__link--static.is-active::after {
  display: none;
}

.nav__chevron {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  opacity: 0.72;
  transition: transform var(--fast) var(--ease);
}

.nav__item.is-open .nav__chevron,
.nav__item:hover .nav__chevron {
  transform: rotate(180deg);
}

.nav__item {
  position: relative;
}

/* 紧凑下拉（解决方案 / 学习中心 / 服务支持） */
.nav-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 188px;
  padding: 0.45rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--base) var(--ease), transform var(--base) var(--ease), visibility var(--base);
  z-index: 30;
}

.nav__item:hover .nav-menu,
.nav__item:focus-within .nav-menu,
.nav__item.is-open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-menu__item {
  display: block;
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-heading);
  line-height: 1.35;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease);
}

.nav-menu__item:hover {
  background: var(--color-bg-soft);
  color: var(--color-primary-dark);
}

.nav-menu__note {
  margin: 0;
  padding: 0.75rem 0.85rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--color-muted);
  font-weight: 500;
}

/* 产品 mega 面板：相对触发项居中，宽度已按视口计算 */
.nav__item--products .nav-panel {
  left: 50%;
  transform: translateX(-35%) translateY(8px);
}

.nav__item--products:hover .nav-panel,
.nav__item--products:focus-within .nav-panel,
.nav__item--products.is-open .nav-panel {
  transform: translateX(-35%) translateY(0);
}

/* Mega product panel — 宽度相对视口，避免相对窄父级被压扁 */
.nav-panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: min(680px, calc(100vw - 2rem));
  min-width: min(520px, calc(100vw - 2rem));
  max-width: calc(100vw - 2rem);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(200px, 0.95fr);
  gap: 0.75rem;
  padding: 0.85rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--base) var(--ease), transform var(--base) var(--ease), visibility var(--base);
  z-index: 30;
}

.nav__item:hover .nav-panel,
.nav__item:focus-within .nav-panel,
.nav__item.is-open .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-panel__feature {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 0.85rem;
  padding: 0.85rem;
  border-radius: 14px;
  background: linear-gradient(145deg, #f7fcff 0%, #edf8fd 100%);
  border: 1px solid rgba(85, 181, 229, 0.18);
  transition: border-color var(--fast) var(--ease);
}

.nav-panel__feature:hover {
  border-color: rgba(85, 181, 229, 0.4);
}

.nav-panel__feature-art {
  border-radius: 12px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  padding: 0.5rem;
  overflow: hidden;
}

.nav-panel__feature-art img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.nav-panel__feature-body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  justify-content: center;
}

.nav-panel__feature-body strong {
  font-size: 0.95rem;
  color: var(--color-heading);
  word-break: keep-all;
  overflow-wrap: normal;
}

.nav-panel__feature-body p {
  font-size: 0.8rem;
  color: var(--color-text);
  line-height: 1.55;
}

.nav-panel__link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary-hover);
  margin-top: 0.25rem;
}

.nav-panel__side {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.nav-panel__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem;
  border-radius: 14px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.nav-panel__item:hover {
  background: var(--color-bg-soft);
  border-color: rgba(85, 181, 229, 0.3);
}

.nav-panel__item img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 10px;
  flex-shrink: 0;
}

.nav-panel__item strong {
  display: block;
  font-size: 0.88rem;
  color: var(--color-heading);
  font-style: normal;
}

.nav-panel__item em {
  display: block;
  font-size: 0.75rem;
  color: var(--color-muted);
  font-style: normal;
  margin-top: 0.15rem;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-heading);
  border: 1px solid var(--color-border);
  background: var(--color-white);
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
}

.nav__actions .btn {
  display: none;
  min-height: 44px;
  padding-inline: 1.2rem;
  font-size: 0.92rem;
}

/* 桌面导航自 1180px 起单行展示 */
@media (min-width: 1180px) {
  .nav__menu {
    display: flex;
    gap: 0.06rem;
    flex: 1 1 auto;
    justify-content: center;
    min-width: 0;
  }

  .nav-toggle {
    display: none;
  }

  .nav__actions .btn {
    display: inline-flex;
  }

  .nav__link {
    padding: 0.36rem 0.4rem;
    font-size: 0.9rem;
  }

  .nav__chevron {
    width: 11px;
    height: 11px;
  }
}

/* 1280 附近收紧，避免挤压 Logo / 免费试用 */
@media (min-width: 1180px) and (max-width: 1365px) {
  .nav__link {
    padding: 0.34rem 0.32rem;
    font-size: 0.875rem;
    gap: 0.12rem;
  }

  .nav__logo-text {
    font-size: 1.02rem;
  }

  .nav__logo-img {
    width: 38px;
    height: 38px;
  }

  .nav__actions .btn {
    min-height: 40px;
    padding-inline: 0.9rem;
    font-size: 0.88rem;
  }
}

@media (min-width: 1366px) and (max-width: 1440px) {
  .nav__link {
    padding: 0.38rem 0.45rem;
    font-size: 0.92rem;
  }

  .nav__menu {
    gap: 0.12rem;
  }
}

@media (min-width: 1441px) {
  .nav__menu {
    gap: 0.28rem;
  }

  .nav__link {
    padding: 0.4rem 0.62rem;
    font-size: 0.9375rem;
  }
}

/* ========== Mobile menu ========== */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  pointer-events: none;
}

.mobile-menu__inner {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, 380px);
  height: 100%;
  background: var(--color-white);
  padding: 4.5rem 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.38s var(--ease);
  box-shadow: -12px 0 40px rgba(23, 53, 77, 0.08);
  overflow-y: auto;
}

.mobile-menu.is-open {
  pointer-events: auto;
  background: rgba(23, 53, 77, 0.18);
}

.mobile-menu.is-open .mobile-menu__inner {
  transform: translateX(0);
}

.mobile-menu__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-heading);
}

.mobile-menu__close svg {
  width: 20px;
  height: 20px;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.55rem 0.15rem;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--color-heading);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu__label {
  margin: 1rem 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

.mobile-menu__products {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 0.75rem;
}

.mobile-menu__product {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-soft);
}

.mobile-menu__product--featured {
  background: linear-gradient(145deg, #f7fcff, #edf8fd);
  border-color: rgba(85, 181, 229, 0.25);
}

.mobile-menu__product img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 12px;
}

.mobile-menu__product strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-heading);
}

.mobile-menu__product span span {
  display: block;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
  font-weight: 400;
}

.mobile-menu__footer {
  padding-top: 1.25rem;
}

.mobile-menu__static {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.55rem 0.15rem;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  cursor: default;
}

.mobile-menu__note {
  margin: 0 0 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--color-muted);
}

.mobile-menu__sub {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin: 0 0 0.55rem;
  padding: 0 0 0.35rem 0.35rem;
  border-left: 2px solid rgba(78, 174, 227, 0.28);
}

.mobile-menu__sub a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.35rem 0.45rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-heading);
  border-radius: 8px;
}

.mobile-menu__sub a:hover {
  background: var(--color-bg-soft);
  color: var(--color-primary-dark);
}

/* ========== Reveal ========== */
.reveal {
  opacity: 1;
  transform: none;
}

html.js-anim .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(18px);
}

html.js-anim .reveal {
  transition:
    opacity 0.7s var(--ease),
    transform 0.7s var(--ease);
  will-change: opacity, transform;
}

html.js-anim .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  will-change: auto;
}

/* Hide legacy numbered markers when present */
.why-mosaic__num {
  display: none;
}

/* ========== Modal ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: rgba(23, 53, 77, 0.28);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--base) var(--ease), visibility var(--base);
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: min(100%, 600px);
  max-height: min(92vh, 760px);
  overflow-y: auto;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  padding: 1.55rem 1.5rem 1.4rem;
}

.modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.45rem;
}

.modal__title {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--color-heading);
}

.modal__close {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.modal__close svg {
  width: 18px;
  height: 18px;
}

.modal__lead {
  font-size: var(--text-small);
  color: var(--color-text);
  margin-bottom: 1.15rem;
  line-height: 1.6;
}

.form-grid {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.form-grid--2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

@media (min-width: 520px) {
  .form-grid--2 {
    grid-template-columns: 1fr 1fr;
  }
}

.form-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 0.35rem;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-heading);
  transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

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

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(85, 181, 229, 0.18);
}

.form-msg {
  display: none;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg-pale);
  border: 1px solid var(--color-border);
  color: var(--color-heading);
  font-size: var(--text-small);
  line-height: 1.55;
}

.form-msg.is-visible {
  display: block;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--color-muted);
  text-align: center;
  line-height: 1.5;
}


.file-drop {
  position: relative;
  border: 1px dashed rgba(78, 174, 227, 0.45);
  border-radius: var(--radius-md);
  background: var(--color-bg-pale);
  padding: 1.1rem 1rem 0.95rem;
}

.file-drop input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  min-height: 0;
  padding: 0;
  border: none;
}

.file-drop__text {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-heading);
  pointer-events: none;
}

.file-drop__hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.5;
  pointer-events: none;
}

.order-side-note {
  margin: 0 0 1rem;
  font-size: var(--text-small);
  color: var(--color-text);
  line-height: 1.7;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  padding: 3.5rem 0 1.75rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.45fr 1fr 1fr 1fr;
    gap: 1.5rem;
  }
}

.footer-brand p {
  margin-top: 0.9rem;
  font-size: var(--text-small);
  color: var(--color-muted);
  max-width: 18rem;
  line-height: 1.7;
}

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

.footer-col__title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 0.35rem;
}

.footer-col a,
.footer-link-btn {
  font-size: var(--text-small);
  color: var(--color-text);
  transition: color var(--fast) var(--ease);
  min-height: 28px;
  text-align: left;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.footer-col a:hover,
.footer-link-btn:hover {
  color: var(--color-primary-hover);
}

.footer-bottom {
  padding-top: 1.35rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-muted);
}