/* ==========================================================================
   THEME COLORS  (carried over from the original Academic Pages default theme)
   ========================================================================== */
:root {
  --bg: #fff;
  --card-bg: #ffffff;
  --text: #4d5358;          /* dark-gray */
  --text-light: #adb1b5;    /* light-gray */
  --border: #e8e9ea;        /* lighter-gray */
  --accent: #1565c0;
  --accent-soft: rgba(21, 101, 192, 0.08);
  --link: #2f7f93;
  --link-hover: #235f6e;
  --shadow: 0 18px 40px rgba(25, 55, 95, 0.08);
}

html[data-theme="dark"] {
  --bg: #474747;
  --card-bg: #3d3d3d;
  --text: #ffffff;
  --text-light: #d8dadb;
  --border: #6f7479;
  --accent: #6fb3ff;
  --accent-soft: rgba(111, 179, 255, 0.12);
  --link: #6fb3ff;
  --link-hover: #9ccbff;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   BASE
   ========================================================================== */
* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2rem 1.5rem 3rem;
  font-family: -apple-system, "Segoe UI", "Roboto", "Helvetica Neue", Arial,
    "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  transition: background 0.25s ease, color 0.25s ease;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover { color: var(--link-hover); text-decoration: underline; }

/* Language visibility: toggled by the [lang] attribute on <html> */
[data-en], [data-zh] { white-space: pre-line; }

/* ==========================================================================
   TOP-RIGHT CONTROLS
   ========================================================================== */
.controls {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 10;
}

.control-btn {
  min-width: 40px;
  height: 40px;
  padding: 0 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.2s ease, color 0.2s ease, transform 0.1s ease;
}
.control-btn:hover { color: var(--accent); }
.control-btn:active { transform: scale(0.95); }

/* ==========================================================================
   LAYOUT — three columns: profile | content | blog
   ========================================================================== */
.layout {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  gap: 1.75rem;
  grid-template-columns: 1fr;   /* mobile: single column */
}

@media (min-width: 1100px) {
  .layout {
    grid-template-columns: minmax(240px, 280px) minmax(0, 1fr) minmax(260px, 320px);
    align-items: start;
  }
  .profile, .blog-col {
    position: sticky;
    top: 1.5rem;
  }
}

/* ==========================================================================
   CARD SHELL — shared surface for every block
   ========================================================================== */
.card, .profile, .blog-card {
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  padding: 1.75rem;
}

.content {
  display: grid;
  gap: 1.75rem;
}

/* ==========================================================================
   LEFT — profile + contact
   ========================================================================== */
.profile { text-align: center; }

.profile__avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
}

.profile__name {
  margin: 1rem 0 0.25rem;
  font-size: 1.4rem;
  line-height: 1.3;
}
.profile__name-cn { font-size: 1.1rem; color: var(--text-light); }

.profile__bio {
  margin: 0 0 1.25rem;
  color: var(--text-light);
  font-size: 0.95rem;
}

.contact {
  list-style: none;
  margin: 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--border);
  text-align: left;
  display: grid;
  gap: 0.7rem;
  font-size: 0.92rem;
}
.contact li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.contact i {
  width: 18px;
  text-align: center;
  color: var(--accent);
  flex-shrink: 0;
}
.contact a { word-break: break-all; }

/* ==========================================================================
   SHARED TYPOGRAPHY
   ========================================================================== */
.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.card__title {
  margin: 0 0 1.25rem;
  font-size: 1.4rem;
}
.lead { margin: 0; font-size: 1.05rem; }
.muted { margin: 0; color: var(--text-light); }

.list { margin: 0; padding-left: 1.2rem; }
.list li + li { margin-top: 0.6rem; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.tags span {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 600;
}

/* ==========================================================================
   EDUCATION
   ========================================================================== */
.edu__identity {
  display: flex;
  gap: 1.1rem;
  align-items: center;
  margin-bottom: 1.5rem;
}
.edu__logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  flex-shrink: 0;
}
.edu__identity h3 { margin: 0 0 0.3rem; font-size: 1.5rem; line-height: 1.15; }
.edu__identity p { margin: 0.1rem 0; color: var(--text-light); }

.edu__stats {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.edu__stats div {
  padding: 0.9rem 1rem;
  border-radius: 14px;
  background: var(--accent-soft);
}
.edu__stats span {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--text-light);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.edu__stats strong { font-size: clamp(1rem, 2.2vw, 1.4rem); line-height: 1.2; overflow-wrap: anywhere; }

/* ==========================================================================
   PUBLICATIONS / PROJECTS
   ========================================================================== */
.pub-list { display: grid; gap: 1rem; }

.pub {
  padding: 1.25rem;
  border-radius: 14px;
  background: var(--accent-soft);
}
.pub__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.pub__venue em { font-style: normal; opacity: 0.8; }
.pub__title {
  margin: 0 0 0.6rem;
  font-size: 1.12rem;
  line-height: 1.45;
  color: var(--text);
}
.pub__desc { margin: 0; color: var(--text-light); font-size: 0.95rem; }

/* ==========================================================================
   RIGHT — blog card
   ========================================================================== */
.blog-card__title { margin: 0 0 0.75rem; font-size: 1.3rem; line-height: 1.3; }
.blog-card__lead { margin: 0 0 1.1rem; color: var(--text-light); }
.tags--blog { margin-bottom: 1.3rem; }

.blog-card__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #1565c0, #42a5f5);
  color: #fff;
  font-weight: 700;
}
.blog-card__link--muted {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  max-width: 1440px;
  margin: 2.5rem auto 0;
  text-align: center;
  color: var(--text-light);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  body { padding: 1.25rem 1rem 2rem; }
  .card, .profile, .blog-card { padding: 1.4rem; }
}
