/* Only invert NegLaB */
/* [data-theme="dark"] .institution-logo:last-child img { */
/*   filter: brightness(0) invert(1); */
/* } */

/* invert both logos in dark mode */
[data-theme="dark"] .institution-logo img {
  filter: brightness(0) invert(1);
}

:root {
  /* Sand-Standard */
  /* --background: #f5f1e8; */
  /* --back-alt: #e8dfd0; */
  /* --accent-prime: #c17b5c; */
  /* --text-sec: #8b6f47; */
  /* --text-main: #3d3834; */
  /* --accent-sec: #a85c3a; */

  /* Playful */
  --background: #f8f6f6;
  --back-alt: #ede8e8;
  --accent-prime: #d63a65;
  --text-sec: #6b4f4f;
  --text-main: #1a1515;
  --accent-sec: #3b82f6;
  --surface: #ffffff;
  --shadow-soft: 0 2px 12px rgba(61, 56, 52, 0.08);
  --shadow-medium: 0 4px 24px rgba(61, 56, 52, 0.12);
  --switch-star: #ffffff;
  --switch-bg: #bcdcff;
  --switch-bg-top: #eaf6ff;
  --switch-bg: #a0c4f0;
  --switch-bg-top: #d0e4f5;
}

[data-theme="dark"] {
  --background: #1a1520;
  --back-alt: #231d2c;
  --accent-prime: #f06090;
  --text-sec: #a89ab8;
  --text-main: #ede8f5;
  --accent-sec: #60a5fa;
  --surface: #2a2435;
  --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 24px rgba(0, 0, 0, 0.5);
  --switch-star: #ffffff;
  --switch-bg: #2a1f4a;
  --switch-bg-top: color-mix(in srgb, #f06090 70%, #2a1f4a);
}

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

body {
  /* font-family: "IBM Plex Sans", sans-serif; */
  font-family: "Alan Sans";
  font-weight: 400;
  background: linear-gradient(
    135deg,
    var(--background) 0%,
    var(--back-alt) 100%
  );
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.7;
  min-height: 100vh;
  transition:
    background 0.3s ease,
    color 0.3s ease;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 40px;
  animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,..."); /* subtle noise */
}

header {
  background: var(--surface);
  padding: 50px 60px;
  border-radius: 24px;
  box-shadow: var(--shadow-medium);
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
  animation: slideDown 0.6s ease-out 0.2s backwards;
  display: flex;
  align-items: center;
  gap: 50px;
  backdrop-filter: blur(10px);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--accent-prime) 0%,
    color-mix(in srgb, var(--accent-prime), var(--accent-sec) 50%) 50%,
    var(--accent-sec) 100%
  );
  border-radius: 24px 24px 0 0;
}

.profile-pic {
  width: 180px;
  height: 180px;
  border-radius: 20px;
  object-fit: cover;
  box-shadow: var(--shadow-soft);
  flex-shrink: 0;
  border: 3px solid var(--back-alt);
}

.header-content {
  flex: 1;
}

h1 {
  /* font-family: "Crimson Pro", serif; */
  font-family: "Alan Sans";
  font-weight: 800;
  /* font-family: "Varela Round"; */
  /* font-weight: 300; */
  font-size: 3.5rem;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.1rem;
  color: var(--text-sec);
  font-weight: 300;
  letter-spacing: 0.02em;
}

.contact-info {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 30px;
  border-top: 1px solid var(--back-alt);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sec);
  text-decoration: none;
  transition: all 0.3s ease;
  padding: 8px 16px;
  border-radius: 12px;
  background: var(--background);
}

.contact-item:hover {
  background: var(--back-alt);
  color: var(--accent-sec);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent-sec) 30%, transparent);
}

.contact-item svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.institution-logos {
  display: flex;
  gap: 20px;
  margin-top: 25px;
  padding-top: 25px;
  border-top: 1px solid var(--back-alt);
  align-items: center;
}

.institution-logo {
  display: block;
  transition: all 0.3s ease;
  opacity: 0.7;
}

.institution-logo:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.institution-logo img {
  height: 50px;
  width: auto;
  display: block;
}

/* ── Sections ────────────────────────────────────────────────────────────── */

section {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  padding: 45px 60px;
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 30px;
  backdrop-filter: blur(10px);

  /* default: dimmed */
  opacity: 0.6;
  transform: scale(1);
  transition:
    opacity 0.4s ease,
    box-shadow 0.4s ease,
    transform 0.4s ease;
}

/* scrolled into view but still closed */
section.visible {
  opacity: 0.75;
}

/* opened by user: full presence + no scale :D */
section.open {
  opacity: 1;
  /* transform: scale(1); */
  box-shadow: var(--shadow-medium);
}

section:hover {
  box-shadow: var(--shadow-medium);
}

/* ── Fold-out ────────────────────────────────────────────────────────────── */

.section-toggle {
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
  border-bottom: none;
}

.section-toggle::after {
  content: "›";
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-sec);
  transition: transform 0.3s ease;
  transform: rotate(90deg);
}

section.open .section-toggle::after {
  transform: rotate(270deg);
}

.section-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s ease;
}

.section-body > * {
  overflow: hidden;
}

section.open .section-body {
  grid-template-rows: 1fr;
  margin-top: 30px;
  border-top: 2px solid var(--back-alt);
  padding-top: 30px;
}

/* ── Initial page-load fade-in ───────────────────────────────────────────── */

.fade-in-section {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease-out,
    transform 0.5s ease-out;
}

.fade-in-section.visible {
  opacity: 0.75;
  transform: translateY(0);
}

.fade-in-section.open {
  opacity: 1;
}

/* ── Typography ──────────────────────────────────────────────────────────── */

h2 {
  /* font-family: "Crimson Pro", serif; */
  /* font-family: "Varela Round"; */
  /* font-family: "Crimson Pro", serif; */
  font-family: "Alan Sans";
  font-weight: 600;
  font-size: 2rem;
  color: var(--accent-prime);
  margin-bottom: 30px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--back-alt);
  letter-spacing: -0.01em;
}

.about-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-main);
}

/* ── Contact section ─────────────────────────────────────────────────────── */

.contact-section {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-main);
}

.contact-section::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--accent-prime) 0%,
    color-mix(in srgb, var(--accent-prime), var(--accent-sec) 50%) 50%,
    var(--accent-sec) 100%
  );
  border-radius: 0 0 24px 24px;
}

.contact-section-info {
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 24px;
}

/* ── Publication / education items ───────────────────────────────────────── */

.edu-item,
.pub-item {
  margin-bottom: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--back-alt);
}

.edu-item:last-child,
.pub-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.edu-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 12px;
}

.degree {
  font-family: "Alan Sans";
  font-weight: 600;
  /* font-family: "Crimson Pro", serif; */
  /* font-weight: 600; */
  font-size: 1.3rem;
  color: var(--text-main);
}

.year {
  font-size: 0.95rem;
  color: var(--text-sec);
  background: var(--background);
  padding: 4px 14px;
  border-radius: 12px;
  font-weight: 500;
}

.institution {
  font-size: 1.05rem;
  color: var(--text-sec);
  font-weight: 400;
}

.pub-title {
  font-family: "Alan Sans";
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.5;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--text-sec);
  margin-bottom: 4px;
}

.pub-venue {
  font-size: 0.9rem;
  color: var(--accent-sec);
  font-style: italic;
  overflow-wrap: break-word;
  word-break: break-word;
}

.loading {
  text-align: center;
  color: var(--text-sec);
  padding: 20px;
  font-style: italic;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .container {
    padding: 40px 24px;
  }

  header {
    flex-direction: column;
    gap: 30px;
    padding: 35px 35px;
    border-radius: 18px;
  }

  .profile-pic {
    width: 140px;
    height: 140px;
  }

  section {
    padding: 35px 35px;
    border-radius: 18px;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  .contact-info {
    flex-direction: column;
    gap: 12px;
  }

  .edu-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

html {
  scroll-behavior: smooth;
}

::selection {
  background: var(--accent-prime);
  color: white;
}

/* ── Toggle-Switch ───────────────────────────────────────────────────────── */
/* From Uiverse.io by JustCode14 */ 
/* Theme Switch */
/* The switch - the box around the slider */
.switch {
  font-size: 17px;
  position: fixed;
  bottom: 32px;
  right: 32px;
  display: inline-block;
  width: 4em;
  height: 2.2em;
  border-radius: 30px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* The slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  /* background-color: var(--surface); */
  background: linear-gradient(
    to top,
    var(--switch-bg),
    var(--switch-bg-top)
  );
  transition: 0.4s;
  border-radius: 30px;
  overflow: hidden;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1.2em;
  width: 1.2em;
  border-radius: 20px;
  left: 0.5em;
  bottom: 0.5em;
  transition: 0.4s;
  transition-timing-function: cubic-bezier(0.81, -0.04, 0.38, 1.5);
  box-shadow: inset 8px -4px 0px 0px var(--text-main);
}

.switch input:checked + .slider:before {
  transform: translateX(1.8em);
  box-shadow: inset 15px -4px 0px 15px #ffd8a8;
}

.star {
  background-color: var(--switch-star);
  border-radius: 50%;
  position: absolute;
  width: 5px;
  height: 5px;
  opacity: 1;
  transform: translateY(0);
  transition: 
    opacity 0.4s ease,
    transform 0.4s ease;
    filter 0.4s ease;
}

/* When switching to LIGHT (checked) → stars disappear */
.switch input:checked ~ .slider .star {
  opacity: 0;
  transform: translateY(-8px); /* drift upward */
  filter: blur(1px);
}

.star_1 {
  left: 2.5em;
  top: 0.5em;
}

.star_2 {
  left: 2.2em;
  top: 1.2em;
}

.star_3 {
  left: 3em;
  top: 0.9em;
}

.switch input:checked ~ .slider .star {
  opacity: 0;
  transition-delay: 0s;
}

.cloud {
  width: 3.5em;
  position: absolute;
  bottom: -1.4em;
  left: -1.1em;

  opacity: 0;
  transform: translateY(10px) scale(0.95); /* start slightly below */
  
  transition: 
    opacity 0.5s ease,
    transform 0.5s ease;
}

/* When LIGHT mode → clouds appear */
.switch input:checked ~ .slider .cloud {
  opacity: 1;
  transform: translateY(0);
}

.switch input:checked ~ .slider .cloud {
  opacity: 1;
  transition-delay: 0.15s;
  transform: translateY(0) scale(1);
}