:root {
  --bg: #eef1f5;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --border: #d8dee7;
  --text: #111827;
  --muted: #495566;
  --primary: #1f5ea9;
  --primary-dark: #184b86;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.1);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.9), rgba(255,255,255,0) 30%),
    linear-gradient(180deg, #f4f6f9 0%, #edf1f6 100%);
  color: var(--text);
}

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

a {
  color: inherit;
}

.page {
  max-width: 1280px;
  margin: 36px auto;
  background: rgba(255,255,255,0.74);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(216, 222, 231, 0.8);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 62px;
  border-bottom: 1px solid rgba(216, 222, 231, 0.9);
  background: rgba(255,255,255,0.72);
}

.brand {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #111;
}

.brand span {
  font-weight: 800;
  letter-spacing: 0.18em;
}

.nav {
  display: flex;
  gap: 42px;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 18px;
  font-weight: 500;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.6fr 0.9fr;
  gap: 40px;
  padding: 54px 62px 24px;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.75), rgba(255,255,255,0) 25%),
    linear-gradient(180deg, rgba(255,255,255,0.34), rgba(255,255,255,0.18));
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  left: -4%;
  right: -4%;
  border-radius: 50%;
  opacity: 0.28;
  pointer-events: none;
}

.hero::before {
  bottom: -16px;
  height: 220px;
  border: 2px solid rgba(255,255,255,0.72);
  transform: rotate(-4deg);
}

.hero::after {
  bottom: 26px;
  height: 160px;
  border: 2px solid rgba(255,255,255,0.58);
  transform: rotate(2deg);
}

.hero-copy,
.hero-side {
  position: relative;
  z-index: 1;
}

.hero h1 {
  line-height: 1.15;
}

.subtitle {
  font-size: 18px;
  color: #273243;
  margin-bottom: 28px;
}

.subtitle .linkish {
  color: var(--primary);
}

.hero p {
  max-width: 860px;
  font-size: 18px;
  line-height: 1.7;
  color: #1f2937;
  margin: 0 0 30px;
}

.button-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 52px;
  border-radius: 12px;
  padding: 0 22px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  color: white;
  background: linear-gradient(180deg, #2369b9, #1d5aa0);
  box-shadow: 0 8px 18px rgba(31, 94, 169, 0.25);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: linear-gradient(180deg, #225fa7, #184b86);
}

.hero-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 6px;
}

.profile-photo {
  width: min(100%, 314px);
  aspect-ratio: 1.22 / 1;
  border-radius: 18px;
  border: 1px solid rgba(216, 222, 231, 0.85);
  box-shadow: 0 16px 32px rgba(15,23,42,0.10);
  object-fit: cover;
  background: linear-gradient(135deg, #cbd6e3, #eef2f7);
}

.social-row {
  display: flex;
  gap: 14px;
  margin-top: 22px;
  flex-wrap: wrap;
  justify-content: center;
}

.social-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(216, 222, 231, 0.95);
  background: linear-gradient(180deg, #ffffff, #f4f7fb);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(15,23,42,0.06);
}

.cards-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  padding: 18px 62px 26px;
}

.feature-card {
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(216, 222, 231, 0.95);
  border-radius: 16px;
  padding: 18px 20px;
  min-height: 116px;
  box-shadow: 0 10px 22px rgba(15,23,42,0.04);
}

.feature-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.45;
}

.icon {
  width: 30px;
  height: 30px;
  color: var(--primary);
  flex: 0 0 auto;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 10px 62px 56px;
}

.section-title {
  font-size: 28px;
  letter-spacing: -0.03em;
  margin: 0 0 22px;
}

.activities {
  padding-right: 18px;
  border-right: 1px solid rgba(216, 222, 231, 0.9);
}

.activity-item,
.blog-item {
  display: grid;
  gap: 16px;
  margin-bottom: 22px;
  align-items: start;
}

.activity-item {
  grid-template-columns: auto 1fr;
}

.activity-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 1px solid rgba(216, 222, 231, 0.9);
  background: linear-gradient(180deg, #ffffff, #f4f7fb);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.activity-text {
  font-size: 17px;
  line-height: 1.55;
  color: #1f2937;
}

.activity-text strong {
  font-size: 18px;
}

.blog-item {
  grid-template-columns: 188px 1fr;
  gap: 18px;
  margin-bottom: 30px;
}

.blog-thumb {
  width: 100%;
  height: 122px;
  border-radius: 14px;
  border: 1px solid rgba(216, 222, 231, 0.9);
  object-fit: cover;
  background: linear-gradient(135deg, #76a0d1, #d8e5f5);
}

.blog-title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.blog-meta {
  color: #5b6575;
  font-size: 14px;
  margin-bottom: 10px;
}

.blog-desc {
  margin: 0 0 10px;
  color: #374151;
  font-size: 16px;
  line-height: 1.6;
}

.read-link {
  text-decoration: none;
  color: var(--primary);
  font-weight: 600;
}

.read-link:hover {
  color: var(--primary-dark);
}

.content-page {
  padding: 54px 62px 56px;
}

.content-page h1 {
  margin-top: 0;
}

.content-page p.lead {
  font-size: 18px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 900px;
}

.card-list {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.simple-card {
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(216, 222, 231, 0.95);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 10px 22px rgba(15,23,42,0.04);
}

.simple-card h3 {
  margin: 0 0 8px;
}

.blog-grid {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.blog-list-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 18px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(216, 222, 231, 0.95);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 10px 22px rgba(15,23,42,0.04);
}

.blog-list-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 14px;
}

.footer-note {
  margin-top: 36px;
  font-size: 14px;
  color: var(--muted);
}

.experience-section {
  padding: 10px 62px 26px;
}

.hidden {
  display: none;
}

.experience-header h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.03em;
}

.experience-header p {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 17px;
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.experience-card {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  align-items: center;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(216, 222, 231, 0.95);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 22px rgba(15,23,42,0.04);
}

.company-logo {
  width: 72px;
  height: 72px;
  object-fit: contain;
  border-radius: 12px;
  background: #fff;
  padding: 8px;
  border: 1px solid rgba(216, 222, 231, 0.9);
}

.experience-card h3 {
  margin: 0 0 6px;
  font-size: 20px;
}

.exp-role {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 600;
}

.site-footer {
  margin-top: 12px;
  padding: 28px 20px;
  background: #0d0f12;
  color: #ffffff;
  text-align: center;
  font-size: 16px;
  letter-spacing: 0.02em;
}

.publications-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 44px 32px 56px;
}

.publications-title {
  margin: 0 0 16px;
  font-size: 42px;
  font-weight: 500;
  letter-spacing: -0.02em;
  padding-bottom: 10px;
  border-bottom: 2px solid #1aa3a3;
}

.pub-year-section {
  margin-top: 24px;
}

.pub-year {
  margin: 0 0 10px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.back-to-top {
  display: inline-block;
  margin-bottom: 16px;
  color: #111827;
  font-size: 15px;
  text-decoration: underline;
}

.pub-list {
  display: grid;
  gap: 14px;
}

.pub-card {
  background: #ffffff;
  border: 1px solid #e6e6e6;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 16px 18px 14px;
}

.pub-card-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.32;
  color: #111;
}

.pub-authors {
  margin: 0 0 4px;
  font-size: 14px;
  line-height: 1.45;
  color: #111;
}

.pub-venue {
  margin: 0;
  font-size: 14px;
  line-height: 1.45;
  font-style: italic;
  color: #5f6368;
}

.pub-links {
  margin-top: 8px;
}

.pub-links a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.pub-links a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.page-title {
  margin: 0 0 18px;
  font-size: 42px;
  font-weight: 500;
  letter-spacing: -0.02em;
  padding-bottom: 10px;
  border-bottom: 2px solid #1aa3a3;
}

/* ===== PROJECT PAGE ===== */

.projects-page {
  padding: 44px 62px 56px;
}

.projects-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.6fr;
  gap: 28px;
  align-items: start;
}

.projects-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-side-img {
  width: 100%;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid #e5e7eb;
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.project-card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
  padding: 20px 22px;
}

.project-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.project-name {
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 16px;
}

.project-year {
  font-weight: 700;
  font-size: 18px;
}

.project-title {
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 8px;
  line-height: 1.35;
}

.project-desc {
  font-size: 17px;
  color: #555;
  line-height: 1.6;
}

@media (max-width: 1150px) {
  .topbar,
  .hero,
  .cards-row,
  .main-grid,
  .content-page {
    padding-left: 28px;
    padding-right: 28px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-side {
    align-items: flex-start;
  }

  .social-row {
    justify-content: flex-start;
  }

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

  .main-grid {
    grid-template-columns: 1fr;
  }

  .activities {
    border-right: 0;
    padding-right: 0;
  }

  .experience-section {
    padding-left: 28px;
    padding-right: 28px;
  }

  .experience-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .publications-page {
    padding-left: 20px;
    padding-right: 20px;
  }

  .publications-title {
    font-size: 36px;
  }

  .pub-year {
    font-size: 28px;
  }

  .pub-card-title {
    font-size: 16px;
  }

  .pub-authors,
  .pub-venue,
  .pub-links a {
    font-size: 13px;
  }

  .projects-layout {
    grid-template-columns: 1fr;
  }

  .projects-visual {
    flex-direction: row;
    overflow-x: auto;
  }

  .project-side-img {
    min-width: 220px;
  }
}

@media (max-width: 760px) {
  .page {
    margin: 0;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .nav {
    gap: 20px;
    flex-wrap: wrap;
  }

  .hero h1 {
    font-size: 40px;
  }

  .cards-row {
    grid-template-columns: 1fr;
  }

  .blog-item,
  .blog-list-card {
    grid-template-columns: 1fr;
  }
}