/* =========================================================
   Thomas Thuan Le Nguyen - Academic Website
========================================================= */

/* =========================
   RESET
========================= */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", Arial, sans-serif;

  background: #fafafa;

  color: #111827;

  line-height: 1.7;

  font-size: 16px;
}

img {
  max-width: 100%;

  display: block;
}

a {
  color: #2563eb;

  text-decoration: none;

  transition: 0.2s ease;
}

a:hover {
  color: #1e40af;
}

/* =========================
   LAYOUT
========================= */

.layout {
  display: flex;

  min-height: 100vh;
}

/* =========================
   SIDEBAR
========================= */

.sidebar {
  position: fixed;

  width: 300px;

  height: 100vh;

  background: white;

  border-right: 1px solid #e5e7eb;

  padding: 45px 35px;

  display: flex;

  flex-direction: column;

  justify-content: space-between;
}

.profile {
  text-align: center;
}

.profile img {
  width: 150px;

  height: 150px;

  object-fit: cover;

  border-radius: 50%;

  margin: 0 auto 25px;

  border: 3px solid #f3f4f6;
}

.profile h1 {
  font-size: 1.35rem;

  font-weight: 700;

  color: #111827;

  line-height: 1.3;
}

.subtitle {
  color: #6b7280;

  margin-top: 10px;

  font-size: 0.95rem;
}

/* =========================
   NAVIGATION
========================= */

.sidebar nav {
  margin-top: 40px;

  display: flex;

  flex-direction: column;

  gap: 8px;
}

.sidebar nav a {
  color: #374151;

  padding: 10px 15px;

  border-radius: 8px;

  font-weight: 500;
}

.sidebar nav a:hover {
  background: #f3f4f6;
}

.sidebar nav a.active {
  background: #eff6ff;

  color: #2563eb;
}

/* =========================
   SOCIAL LINKS
========================= */

.sidebar-links {
  display: flex;

  flex-direction: column;

  gap: 10px;

  font-size: 0.95rem;
}

.sidebar-links a {
  color: #6b7280;
}

.sidebar-links a:hover {
  color: #2563eb;
}

/* =========================
   MAIN CONTENT
========================= */

.content {
  margin-left: 300px;

  width: calc(100% - 300px);

  padding: 70px 90px;

  max-width: 1100px;
}

section {
  margin-bottom: 80px;
}

/* =========================
   HERO
========================= */

.hero {
  padding-top: 30px;
}

.hero h2 {
  font-size: 2.8rem;

  font-weight: 700;

  margin-bottom: 10px;

  color: #111827;
}

.hero h3 {
  font-size: 1.4rem;

  color: #2563eb;

  font-weight: 600;

  margin-bottom: 25px;
}

.hero p {
  max-width: 750px;

  margin-bottom: 18px;

  color: #374151;
}

/* =========================
   HEADINGS
========================= */

h2 {
  font-size: 2rem;

  margin-bottom: 25px;

  color: #111827;
}

h3 {
  color: #111827;
}

section > p {
  max-width: 800px;

  color: #374151;
}

/* =========================
   BUTTONS
========================= */

.buttons {
  margin-top: 30px;

  display: flex;

  gap: 15px;
}

.button {
  display: inline-block;

  padding: 12px 22px;

  border-radius: 8px;

  border: 1px solid #d1d5db;

  color: #111827;

  background: white;

  font-weight: 500;
}

.button:hover {
  background: #f9fafb;
}

.button.primary {
  background: #2563eb;

  border-color: #2563eb;

  color: white;
}

.button.primary:hover {
  background: #1d4ed8;
}

/* =========================
   CARDS
========================= */

.cards {
  display: grid;

  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));

  gap: 25px;
}

.card {
  background: white;

  border: 1px solid #e5e7eb;

  border-radius: 12px;

  padding: 25px;

  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);

  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
}

.card h3 {
  margin-bottom: 12px;
}

.card p {
  color: #4b5563;

  margin-bottom: 15px;
}

/* =========================
   TIMELINE
========================= */

.timeline {
  list-style: none;

  border-left: 2px solid #e5e7eb;

  padding-left: 25px;
}

.timeline li {
  margin-bottom: 25px;

  color: #374151;

  position: relative;
}

.timeline li::before {
  content: "";

  width: 10px;

  height: 10px;

  background: #2563eb;

  border-radius: 50%;

  position: absolute;

  left: -31px;

  top: 9px;
}

.timeline strong {
  display: block;

  color: #111827;

  margin-bottom: 5px;
}

/* =========================
   FOOTER
========================= */

footer {
  border-top: 1px solid #e5e7eb;

  padding-top: 25px;

  color: #6b7280;

  font-size: 0.9rem;
}

/* =========================
   MOBILE
========================= */

@media (max-width: 900px) {
  .layout {
    display: block;
  }

  .sidebar {
    position: relative;

    width: 100%;

    height: auto;

    border-right: none;

    border-bottom: 1px solid #e5e7eb;
  }

  .sidebar nav {
    flex-direction: row;

    flex-wrap: wrap;

    justify-content: center;
  }

  .sidebar-links {
    flex-direction: row;

    justify-content: center;

    margin-top: 25px;
  }

  .content {
    margin-left: 0;

    width: 100%;

    padding: 40px 25px;
  }

  .hero h2 {
    font-size: 2.2rem;
  }
}

@media (max-width: 500px) {
  .buttons {
    flex-direction: column;
  }

  .button {
    text-align: center;
  }
}

/* =========================
   SECTION ANIMATION
========================= */

.fade-section {
  opacity: 0;

  transform: translateY(20px);

  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-section.visible {
  opacity: 1;

  transform: translateY(0);
}

/* =========================
   RESEARCH PAGE
========================= */

.research-item {
  margin-bottom: 35px;
}

.research-meta {
  color: #2563eb;

  font-weight: 500;

  margin-bottom: 15px;
}

.research-item ul {
  margin: 15px 0 20px 25px;
}

.research-item li {
  margin-bottom: 8px;
}

.tags {
  display: flex;

  flex-wrap: wrap;

  gap: 10px;
}

.tags span {
  background: #eff6ff;

  color: #1d4ed8;

  padding: 5px 12px;

  border-radius: 999px;

  font-size: 0.85rem;

  font-weight: 500;
}

/* =========================
   MISC
========================= */

.contact-email {
    overflow-wrap: anywhere;
    word-break: break-word;
}

.contact-info a {
    overflow-wrap: anywhere;
    color: inherit;
}