:root {
  --page-bg: #f4f6f8;
  --ink: #101820;
  --muted: #5d6975;
  --surface: #ffffff;
  --focus: #111111;
  --tile-gap: 14px;
  color-scheme: light dark;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  background: var(--page-bg);
  color: var(--ink);
}

button,
a {
  font: inherit;
}

.page-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 26px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4.6rem);
  font-weight: 300;
  line-height: 0.95;
}

.header-copy {
  max-width: 410px;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.45;
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding-bottom: 44px;
}

.tile-grid {
  display: grid;
  grid-auto-flow: dense;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  grid-auto-rows: 132px;
  gap: var(--tile-gap);
}

.tile {
  position: relative;
  display: grid;
  align-content: space-between;
  min-width: 0;
  min-height: 0;
  padding: 18px;
  border: 0;
  border-radius: 0;
  color: #ffffff;
  text-decoration: none;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transform-style: preserve-3d;
  transition: transform 180ms ease, filter 180ms ease, box-shadow 180ms ease;
}

.tile::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
  opacity: 0.85;
}

.tile:hover {
  filter: brightness(1.04);
  transform: translateY(-3px);
  box-shadow: 0 18px 34px rgba(16, 24, 32, 0.16);
}

.tile:active,
.tile.is-flipping {
  transform: perspective(800px) rotateY(10deg) scale(0.98);
}

.tile:focus-visible,
.close-button:focus-visible,
.referral-link:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 4px;
}

.tile-small {
  grid-column: span 1;
  grid-row: span 1;
}

.tile-medium {
  grid-column: span 2;
  grid-row: span 1;
}

.tile-large {
  grid-column: span 2;
  grid-row: span 2;
}

.tile-top {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
}

.tile-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.18);
  font-size: 1.6rem;
  line-height: 1;
}

.tile-count {
  font-size: 0.8rem;
  font-weight: 700;
  opacity: 0.9;
}

.tile-title {
  display: block;
  margin: 20px 0 8px;
  font-size: clamp(1.24rem, 2.2vw, 2rem);
  font-weight: 500;
  line-height: 1.05;
}

.tile-description {
  display: block;
  margin: 0;
  max-width: 28ch;
  font-size: 0.94rem;
  line-height: 1.35;
  opacity: 0.9;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: stretch;
  background: rgba(13, 18, 24, 0);
  pointer-events: none;
  visibility: hidden;
  transition: background 220ms ease, visibility 220ms ease;
}

.overlay.is-open {
  background: rgba(13, 18, 24, 0.76);
  pointer-events: auto;
  visibility: visible;
}

.overlay-panel {
  position: relative;
  display: grid;
  align-content: start;
  gap: 30px;
  width: 100%;
  min-height: 100%;
  padding: clamp(24px, 5vw, 64px);
  background: var(--overlay-color, #0063b1);
  color: #ffffff;
  overflow-y: auto;
  opacity: 0;
  transform: scale(0.94) rotateY(-7deg);
  transform-origin: center;
  transition: opacity 260ms ease, transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.overlay.is-open .overlay-panel {
  opacity: 1;
  transform: scale(1) rotateY(0);
}

.close-button {
  position: fixed;
  top: clamp(16px, 3vw, 30px);
  right: clamp(16px, 3vw, 30px);
  z-index: 2;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 0;
  background: rgba(0, 0, 0, 0.16);
  color: #ffffff;
  font-size: 2.1rem;
  line-height: 1;
  cursor: pointer;
}

.close-button:hover {
  background: rgba(0, 0, 0, 0.28);
}

.overlay-heading {
  display: flex;
  align-items: center;
  gap: clamp(18px, 4vw, 34px);
  max-width: 980px;
  padding-right: 64px;
}

.overlay-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: clamp(70px, 12vw, 132px);
  height: clamp(70px, 12vw, 132px);
  background: rgba(255, 255, 255, 0.18);
  font-size: clamp(2.4rem, 6vw, 4.8rem);
}

.overlay h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 5.5rem);
  font-weight: 300;
  line-height: 0.98;
}

.overlay-heading p:last-child {
  max-width: 680px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.5;
}

.links-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  width: min(1060px, 100%);
}

.referral-link {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  min-height: 116px;
  padding: 18px;
  color: #ffffff;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  transition: background 160ms ease, transform 160ms ease;
}

.referral-link:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-2px);
}

.referral-link h3 {
  margin: 0 0 8px;
  font-size: 1.14rem;
  font-weight: 600;
  line-height: 1.2;
}

.referral-link p {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.95rem;
  line-height: 1.4;
}

.open-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.18);
  font-size: 1.25rem;
}

body.overlay-open {
  overflow: hidden;
}

@media (max-width: 720px) {
  .page-header {
    display: block;
    padding-top: 32px;
  }

  .header-copy {
    margin-top: 16px;
  }

  .tile-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: 118px;
  }

  .tile-medium,
  .tile-large {
    grid-column: span 2;
  }

  .tile-large {
    grid-row: span 2;
  }

  .overlay-heading {
    display: grid;
    padding-right: 54px;
  }

  .links-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  main,
  .page-header {
    width: min(100% - 22px, 1180px);
  }

  .tile-grid {
    grid-template-columns: 1fr;
  }

  .tile-small,
  .tile-medium,
  .tile-large {
    grid-column: span 1;
    grid-row: span 1;
    min-height: 132px;
  }

  .overlay-panel {
    padding: 22px;
  }

  .close-button {
    width: 44px;
    height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #101418;
    --ink: #f4f7fb;
    --muted: #b7c2cc;
    --surface: #161d24;
    --focus: #ffffff;
  }
}