/**
 * ADA 无障碍与响应式增强
 * - 跳过链接、焦点可见、触控目标、移动端适配
 */

/* ========== 跳过链接 (Skip to main content) ========== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  padding: 12px 24px;
  background: #000;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 12px;
  outline: 3px solid #f4bb1d;
  outline-offset: 2px;
}

/* ========== 焦点可见 (Focus visible - ADA 2.4.7) ========== */
a:focus-visible,
button:focus-visible,
.navbar-toggle:focus-visible {
  outline: 3px solid #f4bb1d;
  outline-offset: 2px;
}
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* 导航链接与按钮焦点 */
.navbar-nav a:focus-visible,
.navbar-default .navbar-nav > li > a:focus-visible {
  outline: 3px solid #f4bb1d;
  outline-offset: 2px;
}
.banner-text a:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

/* 弹窗关闭按钮与 OK 按钮 */
.btn_ok_lin:focus-visible {
  outline: 3px solid #000;
  outline-offset: 2px;
}

/* 回到顶部链接 */
#toTop:focus-visible {
  outline: 3px solid #f4bb1d;
  outline-offset: 2px;
}

/* ========== 屏幕阅读器专用文本 ========== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== 触控目标最小 44x44px (ADA / 移动端) ========== */
@media (max-width: 768px) {
  .navbar-toggle {
    min-width: 44px;
    min-height: 44px;
    padding: 12px;
    margin-right: 8px;
  }
  .navbar-nav > li > a {
    display: block;
    padding: 14px 18px;
    min-height: 44px;
    line-height: 1.4;
    display: flex;
    align-items: center;
  }
  .banner-text a[href^="tel:"] {
    padding: 12px 16px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  #toTop {
    min-width: 44px;
    min-height: 44px;
    padding: 12px;
  }
  .btn_ok_lin {
    min-height: 44px;
    line-height: 44px;
    padding: 0 24px;
  }
}

/* 弹窗 OK 按钮（语义化为 button 后保持原样式） */
#g_close.btn_ok_lin {
  border: none;
  cursor: pointer;
  font-family: inherit;
}
#g_close.btn_ok_lin:hover {
  opacity: 0.9;
}

/* ========== 移动端横幅与主内容适配 ========== */
@media (max-width: 767px) {
  .w3-banner-head-info {
    min-height: 400px;
    height: auto;
    padding-bottom: 40px;
  }
  .banner-text {
    margin-top: 80px !important;
    padding-top: 1em !important;
  }
  .banner-text .top_tel {
    padding-top: 120px !important;
    font-size: 140% !important;
  }
  .header-main .container {
    padding-left: 15px;
    padding-right: 15px;
  }
  .navbar-header h1 a img {
    max-width: 260px;
  }
}

@media (max-width: 480px) {
  .w3-banner-head-info {
    min-height: 360px;
  }
  .banner-text .top_tel {
    font-size: 120% !important;
    padding-top: 80px !important;
  }
}

/* ========== 图库在移动端保持可点击与间距 ========== */
@media (max-width: 767px) {
  .portfolio-grids {
    margin-bottom: 15px;
  }
  .portfolio-grids a {
    display: block;
  }
  .portfolio-grids .img-responsive {
    width: 100%;
    height: auto;
  }
}

/* ========== 地图 iframe 响应式 ========== */
/* About 区块正文对比度（WCAG AA ≥4.5:1） */
.about .about-intro,
.about .col-md-12.text {
  color: #333 !important;
}
.about .about-intro b {
  color: #222;
}

/* Our Location 区块标题与地址居中 */
.Direction .heading {
  text-align: center;
}
.Direction .heading h2,
.Direction .heading #location-heading {
  text-align: center;
  width: 100%;
}
.Direction .heading p {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.Direction iframe {
  max-width: 100%;
  border: 0;
}
@media (max-width: 767px) {
  .Direction iframe {
    height: 320px;
  }
}

/* ========== 高对比度与减少动画（可选，尊重 prefers-reduced-motion） ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}