/* ==========================================================================
   2. 布局工具
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: 24px;
}

.section { padding: 104px 0; position: relative; }
.section--soft { background: var(--c-bg-soft); }
.section--dark { background: var(--c-ink); color: var(--c-text-invert); }

/* 章节标题组 */
.sec-head { max-width: 760px; margin: 0 auto 60px; text-align: center; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase;
  padding: 7px 16px; border-radius: 999px;
  color: var(--c-blue-deep);
  background: var(--g-brand-soft);
  border: 1px solid rgba(59,130,246,.22);
  margin-bottom: 20px;
}
.sec-eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--g-brand);
}
.sec-title {
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.28; font-weight: 800; letter-spacing: -.01em;
}
.sec-desc {
  margin-top: 18px; font-size: 17px; color: var(--c-text-2); line-height: 1.85;
}
.section--dark .sec-desc { color: var(--c-text-invert-2); }

.text-grad {
  background: var(--g-text);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.text-grad-solid {
  background: var(--g-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}


/* ==========================================================================
   16. 响应式
   ========================================================================== */

/* --- 平板横向 / 小桌面 --- */
@media (max-width: 1120px) {
  .menu__link { padding: 0 11px; font-size: 15px; }
  .footer__top { grid-template-columns: 1fr 1fr 1fr; }
}

/* --- 平板：折叠导航为汉堡 --- */
@media (max-width: 1024px) {
  .section { padding: 78px 0; }
  .menu { display: none; }
  .hamburger { display: inline-flex; }
  .nav__actions .btn--primary { display: none; }

  .product-grid { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .value-layout { grid-template-columns: 1fr; gap: 52px; }
  /* Hero 子元素均为绝对定位，移动端仍需保留高度，避免塌陷 */
  .hero { min-height: 100vh; }
  .hero-slide { padding-bottom: 248px; }
  .hero-slide__deco { display: none; }

  /* 关于我们：≤1024px 恢复单列，联系方式卡片取消 sticky */
  .about-layout { grid-template-columns: 1fr; gap: 40px; }
  .contact-card { position: static; }
  /* 工作流程：平板改为 3 列（3×2） */
  .workflow-steps { grid-template-columns: repeat(3, 1fr); }
}

/* --- 平板竖向 --- */
@media (max-width: 820px) {
  :root { --nav-h: 64px; }
  .section { padding: 64px 0; }
  .container { padding-inline: 20px; }
  .sec-head { margin-bottom: 42px; }
  .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
}

/* --- 手机 --- */
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .section { padding: 56px 0; }
  .container { padding-inline: 16px; }

  .hero { padding: calc(var(--nav-h) + 56px) 0 76px; }
  .hero__title { font-size: clamp(28px, 8.4vw, 40px); }
  .hero__subtitle { font-size: 15px; margin-top: 20px; }
  .hero__actions { margin-top: 30px; flex-direction: column; align-items: stretch; }
  .workflow-steps { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero__actions .btn { width: 100%; }
  .hero__stats {
    margin-top: 44px;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px 0; padding: 20px 10px;
  }
  .hero__stat + .hero__stat { border-left: 0; }
  .hero__stat:nth-child(even) { border-left: 1px solid rgba(255,255,255,.1); }
  .hero__stat:nth-child(n+3) { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.1); }
  .scroll-hint { display: none; }

  .pcard { padding: 28px 22px 26px; }
  .pcard__name { font-size: 21px; }
  .pcard__top { flex-direction: column; gap: 14px; }
  .pcard__foot .btn { width: 100%; }

  .cap-grid { grid-template-columns: 1fr; gap: 16px; }
  .cap { padding: 26px 22px; }

  .metric-grid { grid-template-columns: 1fr; }
  .sol__body { padding-left: 22px; }

  .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-card { padding: 26px 20px; }

  .footer { padding-top: 54px; }
  .footer__top { grid-template-columns: 1fr; gap: 28px; padding-bottom: 34px; }
  .footer__brand-desc { max-width: none; }
  .footer__bottom { flex-direction: column; align-items: flex-start; padding-bottom: 76px; }

  .form__row { grid-template-columns: 1fr; }
  .modal__panel { padding: 28px 22px; }

  .to-top { right: 16px; bottom: 62px; width: 44px; height: 44px; }
}

/* --- 打印 / 降低动效偏好 --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}