:root {
  --md-sys-color-primary: #6750a4;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #eaddff;
  --md-sys-color-on-primary-container: #21005d;

  --md-sys-color-background: #fef7ff;
  --md-sys-color-on-background: #1d1b20;

  --md-sys-color-surface: #fef7ff;
  --md-sys-color-surface-variant: #e7e0ec;
  --md-sys-color-on-surface: #1d1b20;
  --md-sys-color-on-surface-variant: #49454f;

  --md-sys-color-outline: #79747e;

  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-full: 100px;
}

.dark-theme {
  --md-sys-color-primary: #d0bcff;
  --md-sys-color-on-primary: #381e72;
  --md-sys-color-primary-container: #4f378b;
  --md-sys-color-on-primary-container: #eaddff;

  --md-sys-color-background: #141218;
  --md-sys-color-on-background: #e6e0e9;

  --md-sys-color-surface: #141218;
  --md-sys-color-surface-variant: #49454f;
  --md-sys-color-on-surface: #e6e0e9;
  --md-sys-color-on-surface-variant: #cac4d0;

  --md-sys-color-outline: #938f99;
}

html {
  scroll-behavior: smooth;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Google Sans Flex', sans-serif;
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-surface-variant) transparent;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--md-sys-color-surface-variant);
  border-radius: var(--md-sys-shape-corner-full);
  border: 2px solid var(--md-sys-color-background);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--md-sys-color-outline);
}

body {
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}

header {
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background-color: var(--md-sys-color-background);
  z-index: 10;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-sys-color-primary);
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: contain;
  display: block;
}

nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

nav a {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

nav a:hover {
  color: var(--md-sys-color-primary);
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease;
}

.icon-btn:hover {
  background-color: var(--md-sys-color-surface-variant);
}

#themeToggleBtn .icon-light {
  display: none;
}

#themeToggleBtn .icon-dark {
  display: block;
}

.dark-theme #themeToggleBtn .icon-light {
  display: block;
}

.dark-theme #themeToggleBtn .icon-dark {
  display: none;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 64px 24px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

section {
  width: 100%;
  padding: 80px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-section {
  padding-top: 20px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--md-sys-color-primary);
  margin-bottom: 24px;
  max-width: 800px;
}

.title-highlight {
  position: relative;
  display: inline-block;
  z-index: 1;
}

.sister-project-pill {
  margin-top: 32px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  background-color: var(--md-sys-color-surface-variant);
  border-radius: var(--md-sys-shape-corner-full);
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.9rem;
  font-weight: 500;
  transition:
    transform 0.2s ease,
    background-color 0.2s ease;
}

.sister-project-pill:hover {
  transform: translateY(-2px);
  background-color: color-mix(in srgb, var(--md-sys-color-on-surface) 8%, var(--md-sys-color-surface-variant));
}

.sister-project-pill a {
  color: var(--md-sys-color-primary);
  font-weight: 600;
  text-decoration: none;
}

.bg-icon-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 140%;
  height: 140%;
  transform: translate(-50%, -50%);
  z-index: -1;
  color: var(--md-sys-color-primary);
  fill: currentColor;
  opacity: 0.15;
  animation: spin-slow 25s linear infinite;
  pointer-events: none;
}

@keyframes spin-slow {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 48px;
  max-width: 600px;
}

.hero-image {
  width: 100%;
  max-width: 900px;
  height: auto;
  border-radius: var(--md-sys-shape-corner-extra-large);
  margin-bottom: 48px;
  display: block;
}

.btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  height: 40px;
  padding: 30px 35px;
  border-radius: var(--md-sys-shape-corner-full);
  font-size: 1rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background-image 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-filled {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.btn-filled:hover {
  background-image: linear-gradient(rgb(255 255 255 / 8%) 0 0);
}

.btn-tonal {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.btn-tonal:hover {
  background-image: linear-gradient(rgb(28 27 31 / 8%) 0 0);
}

.section-title {
  font-size: 2rem;
  margin-bottom: 48px;
  color: var(--md-sys-color-on-background);
}

.features-grid {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  width: 100%;
}

.feature-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  padding: 32px;
  background: color-mix(in srgb, var(--md-sys-color-primary) 4%, var(--md-sys-color-surface));
  border: none;
  border-radius: var(--md-sys-shape-corner-extra-large);
  transition:
    transform 0.2s ease,
    background 0.2s ease;
  color: var(--md-sys-color-on-surface);
  width: 100%;
  max-width: 360px;
  text-decoration: none;
}

.feature-card:hover {
  transform: translateY(-4px);
  background: color-mix(in srgb, var(--md-sys-color-primary) 8%, var(--md-sys-color-surface));
}

.card-icon-wrapper {
  position: relative;
  width: 96px;
  height: 96px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-icon-wrapper .icon-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: color-mix(in srgb, var(--md-sys-color-primary) 16%, var(--md-sys-color-surface));
}

.card-icon-wrapper .icon-fg {
  position: relative;
  z-index: 1;
  width: 40px;
  height: 40px;
  color: var(--md-sys-color-primary);
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.4;
}

.scrim {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.scrim.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background-color: var(--md-sys-color-surface);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 24px;
  width: 90%;
  max-width: 400px;
  transform: scale(0.9);
  transition: transform 0.2s ease;
  text-align: left;
}

.scrim.active .modal {
  transform: scale(1);
}

.modal-title {
  font-size: 1.5rem;
  color: var(--md-sys-color-on-surface);
  margin-bottom: 24px;
}

.browser-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.browser-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background-color: var(--md-sys-color-surface-variant);
  border-radius: var(--md-sys-shape-corner-large);
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
}

.browser-item:hover {
  background-image: linear-gradient(rgb(28 27 31 / 5%) 0 0);
}

.badge-recommended {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 8px;
  display: none;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
}

.footer-divider {
  max-width: 1000px;
  width: 85%;
  margin: 64px auto 0 auto;
  color: var(--md-sys-color-outline);
  opacity: 0.5;
}

.footer-divider svg {
  width: 100%;
  height: auto;
  display: block;
}

footer {
  background-color: transparent;
  padding: 64px 32px;
  color: var(--md-sys-color-on-surface-variant);
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-col h4 {
  color: var(--md-sys-color-on-surface);
  font-size: 1rem;
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul a {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-col ul a:hover {
  color: var(--md-sys-color-primary);
}

.footer-brand .logo-icon {
  margin-bottom: 16px;
}

.footer-brand h3 {
  color: var(--md-sys-color-on-surface);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.5;
  opacity: 0.8;
}

.download-card {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border-radius: 5rem;
  padding: 64px 48px;
  width: 100%;
  max-width: 960px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
  position: relative;
  overflow: hidden;
  margin: 0 auto;
}

.download-card-bg-shape-1 {
  position: absolute;
  top: -60px;
  left: -60px;
  width: 240px;
  height: 240px;
  color: var(--md-sys-color-primary);
  opacity: 0.08;
  pointer-events: none;
}

.download-card-bg-shape-2 {
  position: absolute;
  bottom: -80px;
  right: -60px;
  width: 260px;
  height: 260px;
  color: var(--md-sys-color-primary);
  opacity: 0.08;
  pointer-events: none;
}

.download-card h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
  color: var(--md-sys-color-primary);
  position: relative;
  z-index: 1;
}

.download-card p {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.download-card .btn-group {
  position: relative;
  z-index: 1;
  margin-top: 8px;
}

.download-card .btn-download {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  font-size: 1.05rem;
  font-weight: 600;
  height: auto;
  padding: 16px 36px;
  border-radius: var(--md-sys-shape-corner-full);
  box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.08);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-image 0.2s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.download-card .btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0px 6px 18px rgba(0, 0, 0, 0.12);
  background-image: linear-gradient(rgb(255 255 255 / 8%) 0 0);
}

.download-card .btn-download:active {
  transform: translateY(0);
  box-shadow: 0px 2px 6px rgba(0, 0, 0, 0.06);
}

.download-card .supported-browsers {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.download-card .supported-browsers-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  opacity: 0.6;
  font-weight: 700;
}

.download-card .browser-chips {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.download-card .browser-chip {
  background-color: color-mix(in srgb, var(--md-sys-color-primary) 8%, var(--md-sys-color-primary-container));
  color: var(--md-sys-color-on-primary-container);
  padding: 6px 14px;
  border-radius: var(--md-sys-shape-corner-large);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid color-mix(in srgb, var(--md-sys-color-primary) 12%, transparent);
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  header {
    flex-direction: column;
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: span 1;
  }
  .download-card {
    padding: 40px 24px;
    gap: 20px;
  }
  .download-card h2 {
    font-size: 1.8rem;
  }
  .download-card p {
    font-size: 1rem;
  }
  .download-card .btn-download {
    padding: 14px 28px;
    font-size: 0.95rem;
    width: 100%;
  }
}