/* ---------------------------------------------------
   Lee Jung-ho & Material Design 3 – Premium CSS Layout
   --------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Lora:ital,wght@0,400;0,500;1,400&family=Noto+Serif+KR:wght@300;400;500;600&family=Oswald:wght@400;500;600;700&display=swap');

:root {
  /* M3 System Colors (Lee Jung-ho Tone) */
  --md-sys-color-background: #F6F6F6;
  --md-sys-color-on-background: #222222;
  --md-sys-color-surface: #FAFAFA;
  --md-sys-color-on-surface: #222222;
  --md-sys-color-outline-variant: #E0E0E0;
  --md-sys-color-primary: #5F7D6D; /* Sage Green */
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-text-muted: #767676;
  --md-sys-color-wireframe-bg: #EAEAEA;
  --md-sys-color-wireframe-border: #DCDCDC;

  /* Fonts */
  --font-heading: 'Oswald', 'Inter', sans-serif;
  --font-body: 'Noto Serif KR', 'Lora', serif;
  --font-label: 'Inter', sans-serif;

  /* Spacing Scale */
  --space-xs: 4px;
  --space-s: 8px;
  --space-m: 16px;
  --space-l: 24px;
  --space-xl: 48px;
  --space-xxl: 64px;

  /* Motion */
  --motion-easing-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);
  --motion-duration-medium: 0.4s;
  --motion-duration-short: 0.2s;
}

/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  font-family: var(--font-body);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* Navigation Header */
.navbar {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xl) var(--space-xxl);
  background-color: var(--md-sys-color-background);
  z-index: 1000;
  transition: padding var(--motion-duration-medium) var(--motion-easing-emphasized);
}

.navbar.scrolled {
  padding: var(--space-m) var(--space-xxl);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  background-color: rgba(246, 246, 246, 0.95);
  backdrop-filter: blur(10px);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-background);
}

.nav-menu {
  display: flex;
  gap: var(--space-l);
  list-style: none;
}

.nav-link {
  font-family: var(--font-label);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: var(--space-xs) 0;
  position: relative;
  transition: opacity var(--motion-duration-short) var(--motion-easing-emphasized);
}

.nav-link:hover {
  opacity: 0.6;
}

/* Theme toggle button – pill slider style */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: var(--space-m);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.theme-toggle-track {
  display: inline-flex;
  align-items: center;
  width: 44px;
  height: 24px;
  background-color: var(--md-sys-color-outline-variant);
  border-radius: 999px;
  position: relative;
  transition: background-color 0.3s ease;
}

.theme-toggle-thumb {
  position: absolute;
  left: 4px;
  width: 16px;
  height: 16px;
  background-color: var(--md-sys-color-on-background);
  border-radius: 50%;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

/* Dark mode state for the toggle */
.dark-mode .theme-toggle-track {
  background-color: var(--md-sys-color-primary);
}

.dark-mode .theme-toggle-thumb {
  transform: translateX(20px);
  background-color: #fff;
}

/* Dark mode overrides */
.dark-mode {
  --md-sys-color-background: #121212;
  --md-sys-color-on-background: #e0e0e0;
  --md-sys-color-surface: #1e1e1e;
  --md-sys-color-on-surface: #e0e0e0;
  --md-sys-color-primary: #90caf9;
  --md-sys-color-on-primary: #000000;
  --md-sys-color-outline-variant: #383838;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--md-sys-color-on-background);
}

/* Main Layout & Grid */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xxl) var(--space-xxl) var(--space-xxl);
}

/* Grid & Columns */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

/* Section Dividers */
.divider {
  width: 100%;
  height: 1px;
  background-color: var(--md-sys-color-outline-variant);
  border: none;
  margin: var(--space-xxl) 0;
}

/* Typography styles */
.display-large {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-m);
}

.headline-medium {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-m);
  color: var(--md-sys-color-on-background);
}

.body-large {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.8;
  color: var(--md-sys-color-on-background);
  word-break: keep-all;
  overflow-wrap: break-word;
}

.body-medium {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--md-sys-color-on-background);
  word-break: keep-all;
  overflow-wrap: break-word;
}

.label-small {
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--md-sys-color-text-muted);
}

/* Wireframe Elements */
.wireframe-visual {
  background-color: var(--md-sys-color-wireframe-bg);
  border: 1px solid var(--md-sys-color-outline-variant);
  position: relative;
  width: 100%;
  transition: border-color var(--motion-duration-short) var(--motion-easing-emphasized);
}

.wireframe-visual::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top right, transparent calc(50% - 1px), var(--md-sys-color-wireframe-border) 50%, transparent calc(50% + 1px)),
              linear-gradient(to top left, transparent calc(50% - 1px), var(--md-sys-color-wireframe-border) 50%, transparent calc(50% + 1px));
}

.wireframe-visual:hover {
  border-color: var(--md-sys-color-primary);
}

.aspect-square {
  aspect-ratio: 1 / 1;
}

.aspect-video {
  aspect-ratio: 16 / 9;
}

.aspect-editorial {
  aspect-ratio: 3 / 4;
}

/* Flat Cards (Gallery) */
.gallery-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInVar var(--motion-duration-medium) var(--motion-easing-emphasized) forwards;
}

.gallery-card .caption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: var(--space-xs);
}

.gallery-card .title {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.gallery-card .meta {
  font-family: var(--font-label);
  font-size: 0.75rem;
  color: var(--md-sys-color-text-muted);
  letter-spacing: 0.05em;
}

/* Page Intro Block */
.page-intro {
  margin: var(--space-xxl) 0 var(--space-xl) 0;
}

/* HOME specific layouts */
.hero-visual {
  height: 480px;
  margin-bottom: var(--space-xxl);
}

.intro-section {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-xl);
  margin: var(--space-xxl) 0;
}

.intro-label {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--md-sys-color-primary);
}

/* WORKS specific layouts */
.filter-bar {
  display: flex;
  gap: var(--space-m);
  list-style: none;
  margin-bottom: var(--space-xl);
}

.filter-item {
  font-family: var(--font-label);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  padding: var(--space-xs) 0;
  transition: opacity var(--motion-duration-short) var(--motion-easing-emphasized);
}

.filter-item:hover {
  opacity: 0.6;
}

.filter-item.active {
  color: var(--md-sys-color-primary);
  border-bottom: 1px solid var(--md-sys-color-primary);
}

/* ABOUT specific layouts */
.profile-visual {
  width: 100%;
  max-width: 320px;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-top: var(--space-m);
}

.skill-tag {
  font-family: var(--font-label);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: var(--space-xs) var(--space-m);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 0px; /* Sharp corners */
  background-color: var(--md-sys-color-surface);
}

.history-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-l);
  margin-top: var(--space-m);
}

.history-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--space-m);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  padding-bottom: var(--space-m);
}

.history-year {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

/* CONTACT specific layouts */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-xxl);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-l);
}

.contact-info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-l);
}

.form-input {
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  padding: var(--space-s) 0;
  color: var(--md-sys-color-on-background);
  transition: border-color var(--motion-duration-short) var(--motion-easing-emphasized);
  border-radius: 0;
}

.form-input:focus {
  outline: none;
  border-color: var(--md-sys-color-primary);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.submit-btn {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  background-color: var(--md-sys-color-on-background);
  color: var(--md-sys-color-background);
  border: none;
  padding: var(--space-m) var(--space-xl);
  cursor: pointer;
  transition: background-color var(--motion-duration-short) var(--motion-easing-emphasized);
}

.submit-btn:hover {
  background-color: var(--md-sys-color-primary);
}

/* Footer styling */
.footer {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-xxl) 0;
  font-family: var(--font-label);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--md-sys-color-text-muted);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  margin-top: var(--space-xxl);
}

/* Fade in animation keyframes */
@keyframes fadeInVar {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger animations for list items */
.gallery-card:nth-child(1) { animation-delay: 0.1s; }
.gallery-card:nth-child(2) { animation-delay: 0.2s; }
.gallery-card:nth-child(3) { animation-delay: 0.3s; }
.gallery-card:nth-child(4) { animation-delay: 0.4s; }
.gallery-card:nth-child(5) { animation-delay: 0.5s; }
.gallery-card:nth-child(6) { animation-delay: 0.6s; }

/* Responsive adjustments */
@media (max-width: 840px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .navbar {
    padding: var(--space-l);
  }
  .navbar.scrolled {
    padding: var(--space-s) var(--space-l);
  }
  .container {
    padding: 0 var(--space-l) var(--space-l) var(--space-l);
  }
}

@media (max-width: 600px) {
  .grid-3, .grid-2, .intro-section, .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-l);
  }
  .display-large {
    font-size: 2.25rem;
  }
  .hero-visual {
    height: 300px;
  }
  .profile-visual {
    max-width: 100%;
  }
}

/* ===================================================
   Card & Thumbnail Enhancements
   =================================================== */
.card-image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4; /* Editorial aspect ratio */
  overflow: hidden;
  background-color: transparent; /* 투명 배경 */
  border: none;
  transition: border-color var(--motion-duration-medium) var(--motion-easing-emphasized);
}

.card-image-wrap img,
.card-image-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform var(--motion-duration-medium) var(--motion-easing-emphasized);
}

/* 바우덕이: 영상이 카드를 꽉 채우도록 cover 유지 */
#card-baudeogi .card-image-wrap video,
#feat-card-1 .card-image-wrap video {
  object-fit: cover;
}

/* Wide cards keep cover to fill the landscape frame */
.gallery-card.wide-card .card-image-wrap img,
.gallery-card.wide-card .card-image-wrap video {
  object-fit: cover;
}

.gallery-card:hover .card-image-wrap img,
.gallery-card:hover .card-image-wrap video {
  transform: scale(1.03);
}

.gallery-card:hover .card-image-wrap {
  border-color: transparent;
}

/* ===================================================
   Modal Overlay & Premium Transitions
   =================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(18, 18, 18, 0.4); /* soft semi-transparent dark */
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-duration-medium) var(--motion-easing-emphasized),
              backdrop-filter var(--motion-duration-medium) var(--motion-easing-emphasized);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
}

body.modal-open {
  overflow: hidden;
}

/* Modal Inner Container */
.modal-inner {
  background-color: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  width: 90%;
  max-width: 1000px;
  max-height: 90vh;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.15);
  transform: scale(0.95) translateY(20px);
  opacity: 0;
  transition: transform var(--motion-duration-medium) var(--motion-easing-emphasized),
              opacity var(--motion-duration-medium) var(--motion-easing-emphasized);
}

.modal-overlay.active .modal-inner {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* Modal Gallery / Media Slider */
.modal-gallery {
  position: relative;
  background-color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  aspect-ratio: 4 / 5;
}

.modal-carousel {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform var(--motion-duration-medium) cubic-bezier(0.25, 1, 0.5, 1);
}

.carousel-item {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: #0d0d0d;
}

.carousel-item img,
.carousel-item video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Slide Controls */
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  font-size: 2rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: background-color var(--motion-duration-short), opacity var(--motion-duration-short);
  backdrop-filter: blur(5px);
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.carousel-prev {
  left: var(--space-m);
}

.carousel-next {
  right: var(--space-m);
}

.carousel-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Dot indicators */
.carousel-dots {
  position: absolute;
  bottom: var(--space-m);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-s);
  z-index: 10;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  cursor: pointer;
  transition: background var(--motion-duration-short), transform var(--motion-duration-short);
}

.carousel-dot.active {
  background: #fff;
  transform: scale(1.2);
}

.carousel-dots.hidden {
  display: none;
}

/* Modal Info Panel */
.modal-info {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  max-height: 90vh;
  justify-content: center;
}

.modal-close {
  position: absolute;
  top: var(--space-m);
  right: var(--space-m);
  background: transparent;
  border: none;
  color: var(--md-sys-color-on-background);
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 100;
  transition: transform var(--motion-duration-short) var(--motion-easing-emphasized),
              color var(--motion-duration-short);
}

.modal-close:hover {
  transform: rotate(90deg);
  color: var(--md-sys-color-primary);
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.05em;
  margin-top: var(--space-s);
  text-transform: uppercase;
}

.modal-link,
.modal-pdf-link {
  display: inline-block;
  align-self: flex-start;
  margin-top: var(--space-l);
  font-family: var(--font-label);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  border-bottom: 1px solid var(--md-sys-color-on-background);
  padding-bottom: 2px;
  transition: color var(--motion-duration-short), border-color var(--motion-duration-short), transform var(--motion-duration-short);
}

.modal-link:hover,
.modal-pdf-link:hover {
  color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
  transform: translateX(4px);
}

.modal-pdf-link {
  margin-top: var(--space-s);
}

.modal-link.hidden,
.modal-pdf-link.hidden {
  display: none;
}

/* Modal Content formatting */
.modal-info .divider {
  margin: var(--space-m) 0;
}

/* Responsive modal */
@media (max-width: 840px) {
  .modal-inner {
    grid-template-columns: 1fr;
    max-height: 95vh;
    width: 95%;
  }

  .modal-gallery {
    aspect-ratio: 4 / 3;
  }

  .modal-info {
    padding: var(--space-l);
    max-height: 50vh;
    justify-content: flex-start;
  }
  
  .modal-close {
    background-color: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(5px);
    border-radius: 50%;
    top: var(--space-s);
    right: var(--space-s);
  }
}

/* ===================================================
   Custom 6-Column Grid Layout for Works
   =================================================== */
#works-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

/* Row 1: Baudeogi & AMIOR (3 columns each) */
#card-baudeogi, #card-amior {
  grid-column: span 3;
}

/* Row 2: AI Posters (2 columns each) */
#card-ai-flowing, #card-ai-humidity, #card-ai-illuminated {
  grid-column: span 2;
}

/* Row 3 & 4: Wellness Web & Everytime Card News (6 columns - Full Width) */
.gallery-card.wide-card {
  grid-column: span 6;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.gallery-card.wide-card .card-image-wrap {
  aspect-ratio: 16 / 9; /* Wide widescreen aspect ratio for preview */
}

.gallery-card.wide-card .caption {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-s);
  margin-top: 0;
}

.gallery-card.wide-card .caption .title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.gallery-card.wide-card .caption .meta {
  font-size: 0.85rem;
}

.gallery-card.wide-card .caption .desc-excerpt {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--md-sys-color-text-muted);
  margin-top: var(--space-s);
}

/* Responsive grid adjustments */
@media (max-width: 960px) {
  #works-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  #card-baudeogi, #card-amior {
    grid-column: span 2;
  }
  #card-ai-flowing, #card-ai-humidity {
    grid-column: span 2;
  }
  #card-ai-illuminated {
    grid-column: span 4;
  }
  .gallery-card.wide-card {
    grid-column: span 4;
  }
}

@media (max-width: 840px) {
  .gallery-card.wide-card {
    grid-template-columns: 1fr;
    gap: var(--space-m);
  }
  .gallery-card.wide-card .caption {
    align-items: stretch;
  }
}

@media (max-width: 600px) {
  #works-grid {
    grid-template-columns: 1fr;
    gap: var(--space-l);
  }
  #card-baudeogi, #card-amior, #card-ai-flowing, #card-ai-humidity, #card-ai-illuminated, .gallery-card.wide-card {
    grid-column: span 1;
  }
}

/* ===================================================
   Scroll To Top Button
   =================================================== */
.scroll-top-btn {
  position: fixed;
  bottom: 36px;
  right: 36px;
  width: 44px;
  height: 44px;
  background-color: var(--md-sys-color-on-background);
  color: var(--md-sys-color-background);
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
  z-index: 999;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background-color: var(--md-sys-color-primary);
  color: #fff;
}