/* 全站移动端适配层 */
html, body { max-width: 100%; overflow-x: hidden; }
body { padding-top: 68px; }
body.homepage { padding-top: 0; }
nav { position: fixed !important; top: 0; left: 0; width: 100%; }
.mobile-menu-toggle { display: none; }

.flow-mobile { display: none; }

/* 桌面端：放宽统一版心，减少超宽屏两侧的无效留白。 */
@media (min-width: 1281px) {
  .frame,
  nav .nav-inner,
  .foot-inner,
  .blog-main {
    max-width: 1280px;
  }
}

@media (max-width: 1100px) {
  body { padding-top: 64px; }
  nav .nav-inner { height: 64px; padding: 0 20px; gap: 0; }
  nav .wordmark-text .en { font-size: 14px; }
  nav .wordmark-text .cn { font-size: 10px; }
  .mobile-menu-toggle {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    margin-left: auto;
    padding: 0;
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    cursor: pointer;
  }
  .mobile-menu-toggle span,
  .mobile-menu-toggle::before,
  .mobile-menu-toggle::after {
    content: "";
    display: block;
    width: 16px;
    height: 1.5px;
    background: currentColor;
    transition: transform 180ms ease, opacity 180ms ease;
  }
  .mobile-menu-toggle span { margin: 4px 0; }
  .mobile-menu-toggle[aria-expanded="true"]::before { transform: translateY(5.5px) rotate(45deg); }
  .mobile-menu-toggle[aria-expanded="true"] span { opacity: 0; }
  .mobile-menu-toggle[aria-expanded="true"]::after { transform: translateY(-5.5px) rotate(-45deg); }
  nav .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 12px;
    right: 12px;
    z-index: 70;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(250, 251, 253, 0.98);
    box-shadow: 0 18px 40px -28px rgba(11, 27, 51, 0.45);
    backdrop-filter: blur(14px);
  }
  nav .nav-links.open { display: flex; }
  nav .nav-links a.nav-item {
    display: block;
    padding: 11px 12px;
    border-radius: 7px;
    font-size: 15px;
  }
  nav .nav-links a.nav-item:active,
  nav .nav-links a.nav-item.active { background: #EEF4FF; color: var(--accent); }
  .float-consult {
    right: 16px;
    bottom: 18px;
    flex-direction: row;
    gap: 7px;
    padding: 11px 16px;
    border-radius: 999px;
    letter-spacing: 0;
    box-shadow: 0 8px 22px rgba(21, 84, 232, 0.25);
  }
  .float-consult span {
    writing-mode: horizontal-tb !important;
    white-space: nowrap;
  }
  .frame { border-left: 0; border-right: 0; }
  .foot-inner { border-left: 0; border-right: 0; }
}

@media (max-width: 600px) {
  /* 首页：手机使用纵向流程，避免横向 SVG 裁切。 */
  #flow .flow-wrap { padding: 34px 24px 56px; overflow: visible; }
  #flow .flow-svg { display: none; }
  #flow .flow-mobile { display: grid; justify-items: center; gap: 8px; }
  #flow .flow-mobile > div { width: min(100%, 300px); padding: 13px 16px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); text-align: center; }
  #flow .flow-mobile strong { display: block; font-size: 16px; font-weight: 600; }
  #flow .flow-mobile span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; }
  #flow .flow-mobile i { color: var(--accent); font-size: 19px; font-style: normal; line-height: 1; }
  #flow .flow-mobile-result { border-color: var(--accent); background: #F1F6FF; }
  #products .sec-head { padding-top: 48px; }

  /* 产品页：窄屏改为从统一工作流向下的部门串行流。 */
  .explore-map { grid-template-rows: none !important; gap: 28px !important; }
  .explore-map .explore-core { min-height: 190px !important; margin-bottom: 2px; }
  .explore-map .explore-core p { max-width: none; white-space: nowrap; font-size: 12.5px; line-height: 1.6; }
  .explore-map .dept-node { position: relative; }
  .explore-map .dept-node::before { content: "↓"; position: absolute; top: -25px; left: 50%; transform: translateX(-50%); color: var(--accent); font-size: 18px; line-height: 1; }

  /* 创始人信息：学校与专业在固定信息区域内垂直居中。 */
  .team-edu { min-height: 68px; display: flex; flex-direction: column; justify-content: center; }
}

@media (max-width: 420px) {
  nav .nav-inner { padding: 0 16px; }
  .hero, .page-hero, .form-wrap { padding-left: 20px; padding-right: 20px; }
  .btn { min-height: 42px; }
}