/* =============================================
   PROFESSOR PAGE — Editorial Academic Profile
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=Playfair+Display:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --prof-serif: 'Playfair Display', 'DM Serif Display', Georgia, serif;
  --prof-sans: 'DM Sans', 'Inter', -apple-system, sans-serif;
  --prof-ink: #1A1A1A;
  --prof-ink-soft: #4A4A4A;
  --prof-accent: #2C5F7C;
  --prof-accent-light: #5A8CAA;
  --prof-rule: #D4D4D4;
  --prof-bg: #FFFFFF;
  --prof-paper-line: rgba(190, 205, 218, 0.25);
  --prof-paper-line-fine: rgba(190, 205, 218, 0.10);
  --prof-margin-red: rgba(200, 80, 75, 0.18);
}

/* --- Notebook background --- */
.prof-hero,
.prof-section {
  background-color: var(--prof-bg);
  background-image:
    linear-gradient(var(--prof-paper-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--prof-paper-line) 1px, transparent 1px),
    linear-gradient(var(--prof-paper-line-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--prof-paper-line-fine) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  position: relative;
}

/* Red margin line */
.prof-hero::before,
.prof-section::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 72px;
  width: 1.5px;
  background: var(--prof-margin-red);
  z-index: 1;
  pointer-events: none;
}

/* =============================================
   HERO
   ============================================= */
.prof-hero {
  padding: 5rem 2rem 3.5rem;
  text-align: center;
  border-bottom: 1px solid var(--prof-rule);
}

.prof-hero-inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.prof-hero-label {
  display: inline-block;
  font-family: var(--prof-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--prof-accent);
  margin-bottom: 1.2rem;
  border: 1px solid var(--prof-accent);
  padding: 0.3rem 0.9rem;
}

.prof-hero-title {
  font-family: var(--prof-serif);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  color: var(--prof-ink);
  line-height: 1.15;
  margin: 0 0 0.8rem;
}

.prof-hero-sub {
  font-family: var(--prof-sans);
  font-size: 1rem;
  font-weight: 300;
  color: var(--prof-ink-soft);
  line-height: 1.5;
}

.prof-hero-rule {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
}

.prof-hero-rule span {
  display: block;
  width: 48px;
  height: 2px;
  background: var(--prof-accent);
}

/* =============================================
   SECTIONS
   ============================================= */
.prof-section {
  padding: 3.5rem 2rem;
}

.prof-section--ruled {
  border-top: 1px solid var(--prof-rule);
}

.prof-container {
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.prof-section-heading {
  font-family: var(--prof-serif);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 400;
  color: var(--prof-ink);
  margin: 0 0 2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--prof-rule);
  letter-spacing: -0.01em;
}

/* =============================================
   PROFILE — Portrait + Bio
   ============================================= */
.prof-profile {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

/* Portrait */
.prof-portrait-col {
  position: sticky;
  top: 2rem;
}

.prof-portrait-frame {
  border: 1px solid var(--prof-rule);
  padding: 6px;
  background: var(--prof-bg);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.03);
}

.prof-portrait-frame img {
  width: 100%;
  display: block;
  filter: grayscale(15%);
  transition: filter 0.5s ease;
}

.prof-portrait-frame:hover img {
  filter: grayscale(0%);
}

/* Quick links below portrait */
.prof-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.prof-link-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  font-family: var(--prof-sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--prof-accent);
  text-decoration: none;
  border: 1px solid var(--prof-rule);
  background: var(--prof-bg);
  transition: all 0.3s ease;
}

.prof-link-chip:hover {
  background: var(--prof-accent);
  color: #fff;
  border-color: var(--prof-accent);
}

.prof-link-chip i {
  font-size: 0.72rem;
}

/* Bio column */
.prof-bio-col {
  padding-top: 0.25rem;
}

.prof-name-zh {
  font-family: var(--prof-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--prof-ink);
  margin: 0 0 0.3rem;
  letter-spacing: 0.05em;
}

.prof-degree {
  font-family: var(--prof-sans);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--prof-ink-soft);
  letter-spacing: 0;
}

.prof-role {
  font-family: var(--prof-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--prof-accent);
  margin: 0 0 0.2rem;
}

.prof-role-sub {
  font-family: var(--prof-sans);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--prof-ink-soft);
  margin: 0 0 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--prof-rule);
}

.prof-bio-text p {
  font-family: var(--prof-sans);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--prof-ink-soft);
  margin: 0 0 1rem;
  text-align: justify;
}

.prof-bio-text p:last-child {
  margin-bottom: 0;
}

/* =============================================
   RESEARCH INTERESTS — Tag chips
   ============================================= */
.prof-interests {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.prof-interest-tag {
  font-family: var(--prof-sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--prof-accent);
  padding: 0.8rem 1.3rem;
  border: 1px solid var(--prof-accent);
  background: transparent;
  transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
  cursor: default;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.prof-interest-tag:hover {
  background: var(--prof-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(44, 95, 124, 0.2);
}

/* =============================================
   EDUCATION — Minimal timeline
   ============================================= */
.prof-timeline {
  border-left: 2px solid var(--prof-rule);
  padding-left: 1.8rem;
  margin-left: 0.5rem;
}

.prof-timeline-item {
  position: relative;
  padding-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
}

.prof-timeline-item:last-child {
  padding-bottom: 0;
}

/* Dot on the timeline */
.prof-timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem;
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--prof-bg);
  border: 2px solid var(--prof-accent);
}

.prof-timeline-year {
  font-family: var(--prof-sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--prof-accent);
  min-width: 3rem;
  letter-spacing: 0.04em;
}

.prof-timeline-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.prof-timeline-content strong {
  font-family: var(--prof-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--prof-ink);
}

.prof-timeline-content span {
  font-family: var(--prof-sans);
  font-size: 0.85rem;
  color: var(--prof-ink-soft);
}

/* =============================================
   AWARDS — Grid cards
   ============================================= */
.prof-awards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.prof-award {
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--prof-rule);
  border-left: 3px solid var(--prof-accent);
  background: var(--prof-bg);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.02);
}

.prof-award:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  border-left-color: var(--prof-accent-light);
}

.prof-award-year {
  font-family: var(--prof-sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--prof-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.prof-award-title {
  font-family: var(--prof-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--prof-ink);
  margin-bottom: 0.15rem;
}

.prof-award-org {
  font-family: var(--prof-sans);
  font-size: 0.82rem;
  color: var(--prof-ink-soft);
}

/* =============================================
   PROFESSIONAL SERVICE
   ============================================= */
.prof-service-block {
  margin-bottom: 2rem;
}

.prof-service-block:last-child {
  margin-bottom: 0;
}

.prof-service-cat {
  font-family: var(--prof-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--prof-accent);
  margin: 0 0 0.8rem;
  padding-left: 1rem;
  border-left: 3px solid var(--prof-accent);
}

.prof-service-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.prof-service-list li {
  font-family: var(--prof-sans);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--prof-ink-soft);
  padding: 0.5rem 0 0.5rem 1.2rem;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.05);
  position: relative;
}

.prof-service-list li:last-child {
  border-bottom: none;
}

.prof-service-list li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: var(--prof-rule);
  font-weight: 300;
}

/* =============================================
   TEACHING — Compact card row
   ============================================= */
.prof-teaching-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.prof-teaching-card {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--prof-rule);
  background: var(--prof-bg);
  transition: all 0.35s ease;
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.02);
}

.prof-teaching-card:hover {
  transform: translateY(-2px);
  border-color: var(--prof-accent);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.prof-teaching-card i {
  font-size: 1.1rem;
  color: var(--prof-accent);
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.prof-teaching-card span {
  font-family: var(--prof-sans);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--prof-ink);
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
  .prof-profile {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .prof-portrait-col {
    position: static;
    max-width: 280px;
    margin: 0 auto;
  }

  .prof-links {
    justify-content: center;
  }

  .prof-bio-col {
    text-align: left;
  }

  .prof-interests {
    grid-template-columns: repeat(2, 1fr);
  }

  .prof-awards-grid {
    grid-template-columns: 1fr;
  }

  .prof-teaching-grid {
    grid-template-columns: 1fr;
  }

  .prof-hero::before,
  .prof-section::before {
    display: none;
  }
}

@media (max-width: 600px) {
  .prof-hero {
    padding: 3.5rem 1.5rem 2.5rem;
  }

  .prof-section {
    padding: 2.5rem 1.5rem;
  }

  .prof-hero-title {
    font-size: 1.9rem;
  }

  .prof-name-zh {
    font-size: 1.5rem;
  }
}