/* ===========================
   全局基础设置
   =========================== */

html {
  font-size: 16px;
}

body {
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

:root{
  /* 这两个变量只给 header 用，不影响主体 */
  --content-max: 1280px;
  --header-max: var(--content-max);   /* 与主体相同的对齐宽度 */
  --header-pad: 20px;     /* 与主体相同的左右 padding */
  --jhu-blue: #002d72;
  --jhu-blue-dark: #001f4e;
  --jhu-spirit-blue: #68ace5;
  --jhu-sky: #d9eefb;
  --jhu-pale: #f1f8fd;
  --jhu-ink: #10243e;
}

/* 让 header 内容与主体完全同宽并使用相同的左右留白 */
.masthead__inner-wrap{
  max-width: var(--header-max) !important;
  padding-left: var(--header-pad) !important;
  padding-right: var(--header-pad) !important;
  box-sizing: border-box; /* 避免 padding 额外撑宽造成视觉错位 */
}

/* 小屏时可单独缩小 header 的左右留白（可选） */
@media (max-width: 900px){
  :root{ --header-pad: 20px; }
}

/* ===========================
   Header 全宽 + 固定在顶部（仅此处改动）
   =========================== */

/* 移除上层容器限制，确保 header 可以全屏展开 */
.initial-content,
.site-header,
.wrapper {
  max-width: 100% !important;
  width: 100% !important;
  margin: 0 !important;
  padding: 0 !important;
}

/* 主体、footer 保持居中布局，但不影响 header */
.page,
.archive,
.page__inner-wrap,
.page__content,
.masthead__inner-wrap,
.footer {
  width: 100% !important;
  max-width: var(--content-max) !important;
  margin: 0 auto !important;
  padding-left: 20px;
  padding-right: 20px;
}

/* Header 核心样式（改动：position: sticky；width: 100%） */
.masthead {
  position: sticky;         /* 改自 fixed：吸顶且不遮挡首屏内容 */
  top: 0;
  left: 0;
  right: 0;
  width: 100% !important;   /* 改自 100vw：避免比主体更宽 */
  z-index: 9999;
  margin: 0;
  background-color: #fff;   /* 避免透底 */
  border-bottom: 1px solid #e0e0e0;
  transition: box-shadow 0.3s ease;
}

.masthead__inner-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.masthead.is-sticky {
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 避免 header 遮住主体内容（保留你的原设置） */
.page__content {
  margin-top: 56px; /* sticky header 不再遮挡首屏内容 */
}

/* ===========================
   Sidebar 彻底禁用
   =========================== */
.sidebar {
  display: none !important;
}
.initial-content {
  margin: 0 auto !important;
  float: none !important;
}

/* ===========================
   Header 菜单布局（保持原样）
   =========================== */
.masthead__menu {
  flex: 1 1 auto;
  min-width: 0;
  float: none !important;
  text-align: left !important;
}

.masthead__menu .greedy-nav {
  justify-content: flex-start;
  min-height: 2rem;
  background: transparent;
}

.masthead__menu .greedy-nav .site-title {
  flex: 0 0 auto;
  margin: 0;
  padding-right: 22px;
  font-weight: 700;
  color: #53595e;
}

.masthead__menu .greedy-nav .site-title::after {
  content: "";
  display: inline-block;
  width: 1px;
  height: 1.1em;
  margin-left: 22px;
  vertical-align: -0.18em;
  background: #c7ccd1;
}

.masthead__menu .greedy-nav .visible-links {
  flex: 0 1 auto;
  justify-content: flex-start;
}

.masthead__menu ul {
  display: flex;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.masthead__jhu-engineering {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.masthead__jhu-engineering img {
  display: block;
  height: 38px;
  width: auto;
}

/* ===========================
   首页两列布局（保持原样）
   =========================== */
.home-columns {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 30px;
}
.home-columns .left-col {
  flex: 2;
  min-width: 400px;
}
.home-columns .right-col {
  flex: 1;
  min-width: 250px;
}

/* ===========================
   News Grid 样式（保持原样）
   =========================== */
.news-section {
  margin-top: 10px;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 20px;
  margin-bottom: 40px;
}

.news-card {
  background: #ffffff;
  border: 1px solid #D9D9D9;
  border-radius: 10px;
  padding: 18px 20px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  transition: transform .15s ease, box-shadow .15s ease;
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

.news-card h3 {
  margin: 0 0 8px 0;
  font-size: 1.15rem;
}

.news-card p {
  margin: 0;
  line-height: 1.55;
}

/* 长卡片 = 跨越两列或整行 */
.news-card.long,
.news-card.single {
  grid-column: 1 / -1;
}

/* Read more 链接样式 */
.news-card .read-more {
  display: inline-block;
  margin-top: 10px;
  font-weight: 600;
  text-decoration: none;
}
.news-card .read-more:hover {
  text-decoration: underline;
}

/* 移动端优化（保持原样） */
@media (max-width: 900px) {
  .wrapper,
  .initial-content,
  .page,
  .archive,
  .page__inner-wrap,
  .page__content,
  .masthead__inner-wrap,
  .footer {
    max-width: 100% !important;
    padding-left: 20px;
    padding-right: 20px;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .news-card.long {
    grid-column: span 1;
  }

  .masthead__inner-wrap {
    gap: 12px;
  }

  .masthead__jhu-engineering img {
    height: 30px;
  }

  .masthead__menu ul {
    gap: 18px;
  }

  .masthead__menu .greedy-nav .site-title {
    padding-right: 14px;
  }

  .masthead__menu .greedy-nav .site-title::after {
    margin-left: 14px;
  }
}

/* ===========================
   Global body text scale
   =========================== */
.page__content p,
.page__content li,
.page__content figcaption,
.page__content .archive__item-excerpt,
.page__content .news-card p,
.page__content .research-text p,
.page__content .pub-authors,
.page__content .pub-venue,
.page__content .pub-meta-row,
.page__content .profile-title,
.page__content .profile-affiliation,
.page__content .profile-desc,
.page__content .join-section p,
.page__content .join-section li,
.page__content .join-sweeties-ribbon p {
  font-size: calc(1em + 2px) !important;
}

/* ===========================
   JHU blue visual system
   =========================== */

body {
  color: var(--jhu-ink);
  background: #fff;
}

.masthead {
  background: var(--jhu-blue);
  border-bottom: 0;
  box-shadow: 0 4px 16px rgba(0, 45, 114, .14);
}

.masthead.is-sticky {
  box-shadow: 0 7px 22px rgba(0, 31, 78, .24);
}

.masthead__menu .greedy-nav .site-title,
.masthead__menu .greedy-nav .visible-links a,
.masthead__menu .greedy-nav .hidden-links a {
  color: #fff;
}

.masthead__menu .greedy-nav .site-title {
  letter-spacing: .015em;
}

.masthead__menu .greedy-nav .site-title::after {
  background: rgba(255, 255, 255, .42);
}

.masthead__menu .greedy-nav .visible-links a::before {
  background: var(--jhu-spirit-blue);
}

.masthead__menu .greedy-nav .visible-links a:hover,
.masthead__menu .greedy-nav .visible-links a:focus {
  color: #fff;
}

.masthead__jhu-engineering {
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.masthead__jhu-engineering img {
  filter: brightness(0) invert(1);
  opacity: .96;
}

.greedy-nav__toggle {
  color: #fff;
  background-color: transparent;
}

.greedy-nav .navicon,
.greedy-nav .navicon::before,
.greedy-nav .navicon::after {
  background: #fff;
}

.greedy-nav .hidden-links {
  border-color: rgba(255, 255, 255, .24);
  background: var(--jhu-blue);
  box-shadow: 0 10px 24px rgba(0, 31, 78, .25);
}

.greedy-nav .hidden-links::before {
  border-color: var(--jhu-blue) transparent;
}

.greedy-nav .hidden-links li {
  border-bottom-color: rgba(255, 255, 255, .16);
}

.greedy-nav .hidden-links a:hover,
.greedy-nav .hidden-links a:focus {
  color: #fff;
  background: rgba(104, 172, 229, .22);
}

a {
  color: var(--jhu-blue);
}

.page__footer {
  color: var(--jhu-blue-dark);
  background: var(--jhu-spirit-blue);
  border-top: 0;
}

.page__footer a,
.page__footer .fas,
.page__footer .fab,
.page__footer .far,
.page__footer .fal {
  color: var(--jhu-blue-dark);
}

@media (max-width: 900px) {
  .masthead {
    border-bottom-width: 0;
  }

  .masthead__jhu-engineering {
    padding: 0;
  }
}