/* ============ Reset & Base ============ */
* { box-sizing: border-box; }
html {
  scrollbar-gutter: stable;
  overflow-y: scroll;
}
html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: #2b2b2b;
  background: #fdfdfd;
  -webkit-font-smoothing: antialiased;
}
a { color: #186fa3; text-decoration: none; }
a:hover { color: #e6582a; text-decoration: underline; }
img { max-width: 100%; display: block; }
hr { border: none; border-top: 1px solid #eaeaea; margin: 1.5rem 0; }

/* ============ Masthead (Top Nav) ============ */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid #eee;
}
.masthead__inner-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
}
.greedy-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.greedy-nav ul {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}
.greedy-nav a {
  color: #333;
  font-weight: 500;
  font-size: 0.95rem;
}
.greedy-nav a:hover { color: #e6582a; }
.greedy-nav .home-link {
  margin-right: auto;
  font-weight: 700;
  font-size: 1.05rem;
}

/* ============ Main Layout ============ */
#main {
  max-width: 1280px;
  margin: 2rem auto 5rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.5rem;
}

/* ============ Sidebar ============ */
.sidebar {
  position: sticky;
  top: calc(3.4rem + 2rem);
  align-self: start;
  width: 240px;
}
.author__avatar img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  object-fit: cover;
  margin: 0 0 1rem;
}
.author__name {
  font-family: -apple-system, ".SFNSText-Regular", "San Francisco", "Roboto",
    "Segoe UI", "Helvetica Neue", "Lucida Grande", Arial, sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0.3rem 0 0.3rem;
  text-align: left;
  color: #1a1a1a;
}
.author__bio {
  font-size: 0.92rem;
  color: #555;
  text-align: left;
  margin: 0 0 1rem;
  line-height: 1.45;
}
.author__urls {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}
.author__urls li {
  padding: 0.35rem 0;
  font-size: 0.95rem;
  color: #444;
}
.author__urls li i {
  display: inline-block;
  width: 18px;
  text-align: center;
  margin-right: 0.4rem;
  color: #333;
}
.author__urls a:hover { color: #e6582a; }

/* ============ Article Content ============ */
.page__content {
  font-size: 1rem;
  line-height: 1.75;
}
.page__content h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 2.2rem 0 1.1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #eaeaea;
  color: #1a1a1a;
  scroll-margin-top: 70px;
}
.page__content > h1:first-child { margin-top: 0; }
.page__content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.6rem 0 0.8rem;
}
.page__content p { margin: 0.6rem 0; }
.page__content ul { padding-left: 1.4rem; }
.page__content ul li { margin: 0.3rem 0; }
.page__content strong { color: #1a1a1a; }

/* ============ Paper Box (card style) ============ */
.paper-box {
  position: relative;
  display: flex;
  gap: 1.4rem;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0;
  scroll-margin-top: 70px;
  background: #fff;
  border: 1px solid #ececec;
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.paper-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.10);
  border-color: #d8d8d8;
}

.paper-box-image {
  flex: 0 0 260px;
  position: relative;
}
.paper-ribbon {
  position: absolute;
  top: 14px;
  left: -8px;
  background: #c0392b;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 12px;
  letter-spacing: 0.6px;
  z-index: 3;
  box-shadow: 1px 2px 3px rgba(0, 0, 0, 0.18);
}
.paper-ribbon::before {
  content: "";
  position: absolute;
  bottom: -7px;
  left: 0;
  border-top: 7px solid #8c281e;
  border-left: 8px solid transparent;
}
.paper-box-image > div {
  position: relative;
  border: 1px solid #eee;
  border-radius: 6px;
  overflow: hidden;
  background: #fafafa;
}
.paper-box-image img {
  width: 100%;
  height: auto;
  display: block;
}
.paper-box-text {
  flex: 1;
  min-width: 0;
}
.paper-box-text p { margin: 0.35rem 0; }
.paper-box-text a { word-break: break-word; }
.paper-box-text .paper-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1a1a1a;
  line-height: 1.4;
  margin: 0 0 0.4rem;
}
.paper-box-text .paper-authors {
  font-size: 0.9rem;
  color: #444;
  margin: 0.15rem 0;
}
.paper-box-text .paper-venue {
  display: inline-block;
  width: 120px;
  font-size: 0.9rem;
  font-weight: 700;
  font-style: italic;
  color: #c0392b;
}
.paper-box-text .paper-links {
  font-size: 0.9rem;
  margin: 0.8rem 0 0.35rem;
}
.paper-box-text .paper-links a {
  margin-right: 0.4rem;
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  #main {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .sidebar {
    position: static;
    width: auto;
    left: auto;
    max-width: 320px;
    margin: 0 auto;
  }
  .paper-box { flex-direction: column; }
  .paper-box-image { flex: 0 0 auto; }
  .greedy-nav ul { gap: 0.9rem; }
  .greedy-nav a { font-size: 0.85rem; }
}

@media (max-width: 500px) {
  .author__avatar img { width: 160px; height: 160px; }
  #main { padding: 0 1rem; }
  .page__content h1 { font-size: 1.35rem; }
}