@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&display=swap");

:root {
  --color-bg: #faf9f6;
  --color-bg-secondary: #f3f1ec;
  --color-text: #1b1b1a;
  --color-muted: #6b6964;
  --color-border: rgba(27, 27, 26, 0.09);
  --color-border-accent: rgba(27, 27, 26, 0.22);
  --color-accent: #1b1b1a;
  --font-mono: "IBM Plex Mono", monospace;
  --container-max-width: 1440px;

  --margin-x: 4rem;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --color-header-bg: rgba(250, 249, 246, 0.88);
}

html.dark-theme {
  --color-bg: #0b0b0a;
  --color-bg-secondary: #141413;
  --color-text: #faf9f6;
  --color-muted: #8e8c87;
  --color-border: rgba(250, 249, 246, 0.08);
  --color-border-accent: rgba(250, 249, 246, 0.2);
  --color-accent: #faf9f6;

  --color-header-bg: rgba(11, 11, 10, 0.88);
}

@media (max-width: 1024px) {
  :root {
    --margin-x: 3rem;
    --space-lg: 3rem;
    --space-xl: 4.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --margin-x: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
  }
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html,
body {
  transition:
    background-color 0.4s ease,
    color 0.4s ease;
}

header,
footer,
.course-row,
.research-item,
.profile-links {
  transition:
    background-color 0.4s ease,
    border-color 0.4s ease,
    color 0.4s ease;
}

@media (min-width: 1600px) {
  html {
    font-size: 15px;
  }
}

body {
  overflow-x: hidden;
  position: relative;
  background-color: var(--color-bg);
  color: var(--color-text);
}

a {
  color: inherit;
  text-decoration: none;
}

::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: #e2dfd9;
}
::-webkit-scrollbar-thumb:hover {
  background: #c5c2bc;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--margin-x);
  padding-right: var(--margin-x);
}

header {
  border-bottom: 1px solid var(--color-border);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
  position: sticky;
  top: 0;
  background-color: var(--color-header-bg);
  backdrop-filter: blur(10px);
  z-index: 1000;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 600;
  letter-spacing: -0.03em;
  font-size: 1.05rem;
}

.availability {
  font-size: 0.85rem;
  color: var(--color-muted);
}

@media (max-width: 900px) {
  .availability {
    display: none;
  }
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-links a {
  font-size: 0.9rem;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-links a:hover::after {
  width: 100%;
}

.scroll-to-top {
  position: fixed;
  bottom: var(--space-sm);
  right: var(--space-sm);
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  opacity: 0;
  pointer-events: none;
  transition:
    background-color 0.4s ease,
    color 0.4s ease,
    border-color 0.4s ease,
    opacity 0.3s ease;
}

.scroll-to-top:hover {
  opacity: 0.7;
}

.theme-toggle {
  background: none;
  border: none;
  padding: 0;
  margin-left: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  color: inherit;
  cursor: pointer;
  transition: opacity 0.3s ease;
  vertical-align: middle;
}

.theme-toggle:hover {
  opacity: 0.7;
}

.theme-toggle-mobile {
  display: none;
}

@media (max-width: 768px) {
  .theme-toggle {
    display: none;
  }

  .theme-toggle-mobile {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    width: 38px;
    height: 38px;
    position: fixed;
    bottom: var(--space-sm);
    right: var(--space-sm);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    transition:
      background-color 0.4s ease,
      color 0.4s ease,
      border-color 0.4s ease,
      opacity 0.3s ease;
  }
}

.clock-container {
  font-size: 0.85rem;
  color: var(--color-muted);
  min-width: 85px;
  text-align: right;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .clock-container {
    display: none;
  }
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.profile-layout {
  display: grid;
  grid-template-columns: 4.2fr 7.8fr;
  gap: var(--space-lg);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
  opacity: 0;
  animation: pageFadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@media (max-width: 900px) {
  .profile-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
  }
}

.profile-sidebar {
  position: sticky;
  top: calc(var(--space-md) + 60px);
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

@media (max-width: 900px) {
  .profile-sidebar {
    position: static;
    align-self: stretch;
  }
}

.profile-photo-wrapper {
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition:
    filter 0.5s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.profile-photo:hover {
  filter: grayscale(0%);
  transform: scale(1.02);
}

.profile-name {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.profile-title {
  font-size: 0.95rem;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-top: -8px;
  line-height: 1.4;
}

.profile-bio {
  font-size: 0.98rem;
  color: var(--color-muted);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.profile-bio p {
  font-weight: 300;
}

.profile-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  margin-top: var(--space-xs);
}

.links-label {
  font-size: 0.8rem;
  color: var(--color-muted);
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.profile-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  width: fit-content;
  position: relative;
}

.profile-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.profile-links a:hover::after {
  width: 100%;
}

.profile-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.section-label {
  font-size: 0.85rem;
  color: var(--color-muted);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-label::after {
  content: "";
  flex-grow: 1;
  height: 1px;
  background-color: var(--color-border);
  margin-left: var(--space-md);
}

.course-group-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
}

@media (max-width: 768px) {
  .course-group-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
  }
}

.courses-grid {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-xs);
}

.course-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

.course-row:hover {
  background-color: rgba(27, 27, 26, 0.015);
}

.course-code {
  font-size: 0.9rem;
  font-weight: 600;
  width: 15%;
  color: var(--color-text);
}

.course-title {
  font-size: 0.95rem;
  width: 65%;
  color: var(--color-text);
  font-weight: 400;
}

.course-term {
  font-size: 0.9rem;
  width: 20%;
  text-align: right;
  color: var(--color-muted);
}

@media (max-width: 600px) {
  .course-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: var(--space-sm) 0;
  }
  .course-code,
  .course-title,
  .course-term {
    width: 100%;
  }
  .course-term {
    text-align: left;
    margin-top: 2px;
  }
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xs);
}

@media (max-width: 600px) {
  .research-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
}

.research-item {
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  background-color: var(--color-bg);
  transition:
    border-color 0.3s ease,
    background-color 0.3s ease;
}

.research-item:hover {
  border-color: var(--color-border-accent);
  background-color: var(--color-bg-secondary);
}

.research-item h4 {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
  color: var(--color-text);
  text-transform: uppercase;
}

.research-item p {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.6;
  font-weight: 300;
}

footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
  margin-top: var(--space-lg);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-left {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-right {
  display: flex;
  gap: var(--space-md);
}

.footer-right a {
  font-size: 0.85rem;
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.footer-right a:hover {
  color: var(--color-accent);
}