/* ===========================
   style.css - Minimalist Portfolio
   =========================== */

/* ROOT / VARS */
:root {
  --content-width: 1000px;
  --page-padding: 24px;
  --text-primary: #1a1a1a;
  --text-secondary: rgba(0, 0, 0, 0.7);
  --text-muted: rgba(0, 0, 0, 0.55);
  --link-color: #0066cc;
  --accent-color: #dc143c;
  --bg: #ffffff;
  --border-light: #e5e5e5;
}

/* RESET / BASE */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.75;
}

/* MAIN CONTENT */
main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--page-padding);
}

/* HERO SECTION */
.hero {
  margin: 80px 0 50px;
  display: flex;
  gap: 70px;
  align-items: flex-start;
}

/* HERO LEFT (CONTENT) */
.hero-content {
  flex: 1;
  max-width: 650px;
}

.hero-name {
  font-size: 42px;
  font-weight: 700;
  margin: 0 0 12px 0;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1.3;
}

.multilingual-greeting {
  font-family: Georgia, serif;
  font-size: 18px;
  font-style: italic;
  color: var(--text-secondary);
  margin: 16px 0 32px 0;
  letter-spacing: 0.8px;
}

.hero-bio {
  margin-bottom: 0;
}

.hero-bio p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  margin: 0 0 16px 0;
}

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

.hero-bio a {
  color: var(--accent-color);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, opacity 0.2s ease;
}

.hero-bio a:hover {
  border-bottom-color: var(--accent-color);
  opacity: 0.8;
}

/* HERO RIGHT (IMAGE) */
.hero-right {
  flex: 0 0 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding-top: 8px;
}

.hero-image {
  width: 340px;
  height: 420px;
  object-fit: cover;
  border-radius: 16px;
  border: 2px solid var(--border-light);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  background: #fff;
}

/* VERTICAL SOCIAL LINKS */
.vertical-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 340px;
  margin-top: 8px;
}

.vertical-links a {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 400;
  transition: opacity 0.2s ease;
}

.vertical-links a:hover {
  opacity: 0.7;
}

.vertical-links svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

/* Brand Colors for Icons */
.vertical-links a[href*="mailto"] svg { stroke: #555555; }
.vertical-links a[href*="linkedin"] svg { fill: #0077b5; }
.vertical-links a[href*="github"] svg { fill: #181717; }
.vertical-links a[href*="twitter"] svg,
.vertical-links a[href*="x.com"] svg { fill: #000000; }
.vertical-links a[href*="scholar"] svg { fill: #4285f4; }

/* AFFILIATIONS / LOGOS */
.affiliations {
  margin: 50px 0 40px;
  padding: 0;
}

.affiliation-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 35px;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.affiliation-logos img {
  height: 65px;
  opacity: 0.75;
  filter: grayscale(20%);
  transition: opacity 0.2s ease, transform 0.2s ease, filter 0.2s ease;
}

.affiliation-logos img:hover {
  opacity: 1;
  filter: grayscale(0%);
  transform: translateY(-2px);
}

/* SECTIONS BASE */
.section {
  margin: 50px 0;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* RESEARCH SECTION */
.research-section {
  margin: 60px 0;
}

.research-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.research-section p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
}

.research-section table {
  width: 100%;
  border: 0;
  border-spacing: 0;
  border-collapse: separate;
  margin: 0 auto;
}

.research-section td {
  font-size: 16px;
  line-height: 1.6;
  padding: 20px 0;
  vertical-align: top;
}

.research-section tr {
  border-bottom: 1px solid var(--border-light);
}

.research-section tr:last-child {
  border-bottom: none;
}

papertitle {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: inline;
}

.research-section em {
  font-style: italic;
  color: var(--text-secondary);
}

.research-section strong {
  font-weight: 600;
  color: var(--text-primary);
}

.research-section a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, opacity 0.2s ease;
}

.research-section a:hover {
  border-bottom-color: var(--accent-color);
  opacity: 0.8;
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 40px 0;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 60px;
}

/* RESPONSIVE RULES */
@media (max-width: 900px) {
  .hero {
    flex-direction: column-reverse;
    gap: 40px;
    margin: 60px 0 40px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-right {
    width: 100%;
    padding-top: 0;
    flex: 1;
  }

  .hero-image {
    width: 280px;
    height: 340px;
  }

  .vertical-links {
    max-width: 280px;
    gap: 14px;
  }

  .vertical-links a {
    font-size: 15px;
  }

  .vertical-links svg {
    width: 18px;
    height: 18px;
  }

  .affiliation-logos {
    gap: 25px;
    flex-wrap: wrap;
  }

  .affiliation-logos img {
    height: 55px;
  }

  .research-section h2 {
    font-size: 20px;
  }

  .research-section td,
  .research-section p {
    font-size: 15px;
  }

  papertitle {
    font-size: 15px;
  }
}

@media (max-width: 640px) {
  .hero-name {
    font-size: 36px;
  }

  .multilingual-greeting {
    font-size: 15px;
    letter-spacing: 0.5px;
  }

  .hero-bio p {
    font-size: 15px;
  }

  .hero-image {
    width: 240px;
    height: 300px;
  }

  .vertical-links {
    max-width: 240px;
    gap: 12px;
  }

  .vertical-links a {
    font-size: 14px;
  }

  .vertical-links svg {
    width: 16px;
    height: 16px;
  }

  .section-title {
    font-size: 24px;
  }

  .affiliation-logos {
    gap: 18px;
  }

  .affiliation-logos img {
    height: 42px;
  }

  .research-section h2 {
    font-size: 18px;
  }

  .research-section td,
  .research-section p {
    font-size: 14px;
  }

  papertitle {
    font-size: 14px;
  }
}

/* ACCESSIBILITY */
a:focus {
  outline: 2px solid var(--link-color);
  outline-offset: 2px;
  border-radius: 2px;
}

a:focus:not(:focus-visible) {
  outline: none;
}

/* PRINT STYLES */
@media print {
  .footer {
    display: none;
  }

  body {
    background: white;
  }

  a {
    color: var(--text-primary);
    text-decoration: underline;
  }
}