/* ==========================================================================
   style.css — Personal research website theme
   Palette: "Ember & Slate" — warm ember accent + deep slate text,
   loosely inspired by combustion (ember orange) and a calm academic base.

   To use other palettes, just swap the values inside :root below.
   Two alternates are provided as comments at the bottom of this block.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500;600&display=swap');

:root {
  /* --- Color tokens ------------------------------------------------- */
  --color-bg: #faf9f6;          /* page background, warm off-white */
  --color-surface: #ffffff;     /* cards / boxes */
  --color-text: #1f2328;        /* primary text, near-black slate */
  --color-text-muted: #5b6168;  /* secondary text */
  --color-accent: #c1502e;      /* ember orange — links, buttons, highlights */
  --color-accent-dark: #9c3f22; /* hover state for accent */
  --color-secondary: #1d3557;   /* deep slate blue — headings, nav */
  --color-border: #e8e6e1;

  /* --- ALTERNATE PALETTE 1: "Magnet Blue" -----------------------------
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #1a1d29;
  --color-text-muted: #5c6370;
  --color-accent: #2b4c7e;
  --color-accent-dark: #1e3556;
  --color-secondary: #b87333;
  --color-border: #e2e4e9;
  ----------------------------------------------------------------------- */

  /* --- ALTERNATE PALETTE 2: "Graphite & Citrine" (dark) ---------------
  --color-bg: #111315;
  --color-surface: #1b1e21;
  --color-text: #e8e6e1;
  --color-text-muted: #9aa0a6;
  --color-accent: #f2b134;
  --color-accent-dark: #cf9626;
  --color-secondary: #f2b134;
  --color-border: #2a2d31;
  ----------------------------------------------------------------------- */

  /* --- Type, radius, shadow ------------------------------------------ */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 10px;
  --shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   Base
   ========================================================================== */

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-secondary);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 { font-size: 2.1rem; }
h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}
h3 { font-size: 1.1rem; }

p, li {
  color: var(--color-text);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}
a:hover {
  border-bottom-color: var(--color-accent);
}

::selection {
  background-color: var(--color-accent);
  color: #fff;
}

/* ==========================================================================
   Layout
   ========================================================================== */

/* Page width is controlled via the format.html.grid YAML option
   (body-width / margin-width) in each .qmd's front matter, or in
   _quarto.yml at the project level — NOT here. Overriding
   .page-columns / grid-template-columns directly in CSS breaks
   Quarto's TOC ("On this page") column placement. */

/* ==========================================================================
   Navigation (if using a Quarto site navbar)
   ========================================================================== */

.navbar {
  background-color: var(--color-surface) !important;
  border-bottom: 1px solid var(--color-border);
}
.navbar-title,
.navbar-brand {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-secondary) !important;
}
.navbar-nav .nav-link {
  color: var(--color-text-muted) !important;
  font-weight: 500;
}
.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--color-accent) !important;
}

/* ==========================================================================
   Cards / boxed sections
   ========================================================================== */

.box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
}
.box h3 {
  color: var(--color-secondary);
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: 0.6rem;
}
.contact-box p {
  margin: 0.25rem 0;
}

.box-grid,
.box-grid-3 {
  display: grid;
  gap: 1.25rem;
}
.box-grid { grid-template-columns: repeat(2, 1fr); }
.box-grid-3 { grid-template-columns: repeat(3, 1fr); }
.box-grid .box,
.box-grid-3 .box { margin-bottom: 0; }

@media (max-width: 768px) {
  .box-grid,
  .box-grid-3 { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-app {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.6rem 1.5rem;
  background-color: var(--color-accent);
  color: #fff !important;
  text-decoration: none !important;
  border: none;
  border-radius: 10px;
  font-weight: 500;
  font-family: var(--font-body);
  transition: background-color 0.2s ease;
}
.btn-app:hover {
  background-color: var(--color-accent-dark);
}

.btn-app-outline {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.55rem 1.4rem;
  background-color: transparent;
  color: var(--color-secondary) !important;
  border: 1.5px solid var(--color-secondary);
  border-radius: 8px;
  font-weight: 500;
  text-decoration: none !important;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.btn-app-outline:hover {
  background-color: var(--color-secondary);
  color: #fff !important;
}

/* ==========================================================================
   Hero (landing page intro)
   ========================================================================== */

.hero {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 2.75rem;
  margin-bottom: 2rem;
}
.hero h1 {
  font-size: 2.4rem;
  margin-top: 0;
  margin-bottom: 0.4rem;
}
.hero .tagline {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0 0 1.25rem 0;
}
.hero .hero-note {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  border-left: 3px solid var(--color-border);
  padding-left: 1rem;
  margin-top: 1.5rem;
}

/* ==========================================================================
   Publications / pubs list (common on research sites)
   ========================================================================== */

.pub-entry h4 {
  font-family: var(--font-display);
  color: var(--color-secondary);
  font-size: 1.05rem;
  margin: 0 0 0.4rem 0;
}
.pub-entry p {
  margin: 0.2rem 0;
}
.pub-entry .pub-authors {
  color: var(--color-text-muted);
  font-size: 0.92rem;
}
.pub-entry .pub-venue {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-style: italic;
}
.pub-entry .pub-venue strong {
  color: var(--color-text);
  font-style: italic;
}

/* --- Publications: scrollable list ---------------------------------- */

.pub-list-wrap {
  position: relative;
  margin-bottom: 1.5rem;
}
.pub-list-wrap::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0.6rem;
  bottom: 0;
  height: 36px;
  background: linear-gradient(to bottom, transparent, var(--color-bg));
  pointer-events: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.pub-list {
  max-height: 480px;
  overflow-y: auto;
  padding-right: 0.6rem;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}
.pub-list::-webkit-scrollbar {
  width: 8px;
}
.pub-list::-webkit-scrollbar-track {
  background: transparent;
}
.pub-list::-webkit-scrollbar-thumb {
  background-color: rgba(91, 97, 104, 0.45); /* ~45% var(--color-text-muted); static value for broad browser support */
  border-radius: 4px;
}
.pub-list:hover::-webkit-scrollbar-thumb,
.pub-list:focus-within::-webkit-scrollbar-thumb {
  background-color: var(--color-secondary);
}

.pub-list .box.pub-entry {
  margin-bottom: 0.75rem;
  min-height: 140px;
}
.pub-list .box.pub-entry:last-child {
  margin-bottom: 0;
}

.pub-entry {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1.5rem;
}
.pub-entry .pub-main {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.pub-entry .pub-links {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-self: center;
}

.pub-entry .pub-links .pub-link + .pub-link {
  margin-top: 1rem;
}

.pub-link {
  display: block;
  width: 3.5rem;
  padding: 0.15rem;
  font-size: 0.75rem;
  font-weight: 800;
  text-align: center;
  border-radius: 10px;
  background-color: #f8eae6;
  color: var(--color-accent) !important;
  text-decoration: none !important;
  white-space: nowrap;
  border: 1px solid var(--color-accent);
  box-sizing: border-box;
}
.pub-link:hover {
  background-color: var(--color-accent);
  color: #fff !important;
}

@media (max-width: 768px) {
  .pub-entry {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .pub-entry .pub-links {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* ==========================================================================
   Member lists (Team / Current / Alumni)
   ========================================================================== */

.list-clean ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.list-clean li {
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--color-border);
}
.list-clean li:last-child { border-bottom: none; }
.list-clean .member-role {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   Misc text utilities
   ========================================================================== */

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* ==========================================================================
   Footer
   ========================================================================== */

footer,
.page-footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  padding-top: 1.5rem;
  margin-top: 3rem;
}

/* ==========================================================================
   Publications — collapsible year groups
   ========================================================================== */

.pub-year-group {
  margin-bottom: 0.75rem;
}

.pub-year-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-secondary);
  cursor: pointer;
  user-select: none;
  padding: 0.5rem 0;
  list-style: none;           /* hide default marker in Firefox */
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 0.75rem;
}
.pub-year-label::-webkit-details-marker { display: none; } /* hide Safari marker */

/* custom chevron indicator */
.pub-year-label::before {
  content: "▾";
  font-size: 1rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
  display: inline-block;
}
details.pub-year-group:not([open]) .pub-year-label::before {
  transform: rotate(-90deg);
}

.pub-year-label:hover {
  color: var(--color-accent);
}

/* remove the outer scroll wrap when year groups handle their own layout */
.pub-list-wrap::after { display: none; }

/* ==========================================================================
   Team member social links — horizontal row (does NOT affect pub-entry buttons)
   ========================================================================== */
.pub-links-row {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 1.0rem;
  margin-top: 0.5rem;
}
.pub-links-row .pub-link {
  display: inline-block;
  width: auto;
  padding-left: 0.5rem;
  padding-right: 0.5rem;
  margin-top: 0 !important;   /* reset the vertical spacing from .pub-link + .pub-link */
}

.profile-photo img{
    width:180px;
    border-radius:50%;
    margin-top: 18px;   /* 往下移动 15px */
}

.research-figure img{
    width:auto;
    border-radius:5%;
    margin-top: 18px;   /* 往下移动 15px */
}