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

:root {
  --background: #080c16;
  --background-two: #0d1423;

  --card: #111a2c;
  --card-two: #162137;

  --border: rgba(255, 255, 255, 0.09);

  --text: #f8fafc;
  --muted: #94a3b8;

  --purple: #795cff;
  --purple-light: #9a86ff;

  --blue: #5d8cff;

  --empty-cell: #19243a;
}


/* =========================
   GLOBAL
========================= */

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;

  color: var(--text);

  background:
    radial-gradient(
      circle at 50% -10%,
      rgba(121, 92, 255, 0.20),
      transparent 34rem
    ),
    var(--background);

  font-family:
    Inter,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

button {
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--purple-light);
  outline-offset: 3px;
}


/* =========================
   HEADER
========================= */

.site-header {
  height: 70px;

  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1180px;
  height: 100%;

  margin: auto;
  padding: 0 22px;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  color: #ffffff;

  text-decoration: none;

  font-size: 24px;
  font-weight: 950;

  letter-spacing: -1.5px;
}

.logo span {
  color: #8c74ff;
}

.main-nav {
  display: flex;
  gap: 26px;
}

.main-nav a {
  color: #9ca8bb;

  text-decoration: none;

  font-size: 14px;

  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: #ffffff;
}


/* =========================
   MAIN
========================= */

main {
  max-width: 1180px;

  margin: auto;

  padding:
    45px
    20px
    75px;
}


/* =========================
   HERO
========================= */

.hero-section {
  min-height: 700px;

  display: grid;

  grid-template-columns:
    0.72fr
    1.28fr;

  align-items: center;

  gap: 40px;
}

.hero-content {
  padding-left: 15px;
}

.game-label {
  display: inline-flex;

  padding:
    8px
    12px;

  margin-bottom: 18px;

  border:
    1px solid
    rgba(121, 92, 255, 0.3);

  border-radius: 999px;

  background:
    rgba(121, 92, 255, 0.1);

  color: #aa9cff;

  font-size: 11px;

  font-weight: 800;

  letter-spacing: 1.3px;
}

.hero-content h1 {
  font-size: clamp(
    43px,
    5vw,
    69px
  );

  line-height: 0.98;

  letter-spacing: -3.5px;

  margin-bottom: 20px;
}

.hero-content p {
  max-width: 480px;

  color: var(--muted);

  font-size: 17px;

  line-height: 1.7;
}


/* =========================
   GAME CARD
========================= */

.game-card {
  width: min(
    100%,
    620px
  );

  margin: auto;

  padding: 19px;

  border:
    1px solid
    var(--border);

  border-radius: 27px;

  background:
    linear-gradient(
      145deg,
      #151f34,
      #0e1525
    );

  box-shadow:
    0 30px 90px
    rgba(0, 0, 0, 0.4);
}


/* =========================
   GAME TOP
========================= */

.game-topbar {
  display: flex;

  align-items: center;

  gap: 10px;

  margin-bottom: 15px;
}

.score-box {
  min-width: 105px;

  padding:
    8px
    12px;

  border:
    1px solid
    rgba(255, 255, 255, 0.055);

  border-radius: 13px;

  background:
    rgba(255, 255, 255, 0.045);
}

.score-box span {
  display: block;

  color: #7f8ba2;

  font-size: 9px;

  font-weight: 800;

  letter-spacing: 1px;
}

.score-box strong {
  display: block;

  margin-top: 2px;

  font-size: 19px;
}

.restart-button {
  width: 43px;
  height: 43px;

  margin-left: auto;

  border:
    1px solid
    var(--border);

  border-radius: 12px;

  background: #1c2840;

  color: white;

  font-size: 23px;

  cursor: pointer;

  transition:
    transform 0.2s ease,
    background 0.2s ease;
}

.restart-button:hover {
  background: #263653;

  transform: rotate(-25deg);
}


/* =========================
   BOARD
========================= */

.board-container {
  position: relative;
}

.game-board {
  width: min(
    100%,
    510px
  );

  aspect-ratio: 1;

  margin: auto;

  padding: 8px;

  display: grid;

  grid-template-columns:
    repeat(8, 1fr);

  gap: 5px;

  border:
    1px solid
    rgba(255, 255, 255, 0.06);

  border-radius: 18px;

  background: #0a1020;
}

.game-cell {
  border-radius: 6px;

  background:
    var(--empty-cell);

  cursor: pointer;

  transition:
    transform 0.12s ease,
    filter 0.12s ease,
    background 0.12s ease;
}

.game-cell:hover {
  filter: brightness(1.18);
}

.game-cell.preview {
  transform: scale(0.90);

  filter: brightness(1.25);
}

.game-cell.filled {
  box-shadow:
    inset
    5px
    6px
    7px
    rgba(255, 255, 255, 0.18),

    inset
    -5px
    -6px
    8px
    rgba(0, 0, 0, 0.2),

    0 2px 6px
    rgba(0, 0, 0, 0.2);

  animation:
    blockAppear
    0.16s
    ease-out;
}

.game-cell.clearing {
  animation:
    blockBlast
    0.3s
    ease-out
    forwards;
}

@keyframes blockAppear {
  from {
    transform: scale(0.55);
    opacity: 0.25;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes blockBlast {
  0% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.25);
    opacity: 0.8;
  }

  100% {
    transform: scale(0);
    opacity: 0;
  }
}


/* =========================
   GAME OVER
========================= */

.game-over {
  position: absolute;

  inset: 0;

  display: grid;

  place-items: center;

  border-radius: 18px;

  background:
    rgba(5, 8, 15, 0.84);

  backdrop-filter: blur(6px);
}

.game-over[hidden] {
  display: none;
}

.game-over-box {
  width: min(
    310px,
    85%
  );

  padding:
    28px
    22px;

  text-align: center;

  border:
    1px solid
    var(--border);

  border-radius: 22px;

  background: #141d30;

  box-shadow:
    0 25px 70px
    rgba(0, 0, 0, 0.5);
}

.game-over-icon {
  font-size: 42px;
}

.game-over-box h2 {
  margin:
    6px
    0;

  font-size: 27px;
}

.game-over-box p {
  color: var(--muted);

  font-size: 12px;
}

.game-over-box > strong {
  display: block;

  margin:
    2px
    0
    17px;

  font-size: 34px;
}

.primary-button {
  width: 100%;
  height: 46px;

  border: 0;

  border-radius: 12px;

  background:
    linear-gradient(
      135deg,
      #795cff,
      #5c8dff
    );

  color: white;

  font-weight: 800;

  cursor: pointer;

  transition:
    transform 0.2s ease,
    filter 0.2s ease;
}

.primary-button:hover {
  transform: translateY(-2px);

  filter: brightness(1.08);
}


/* =========================
   PIECES
========================= */

.pieces-heading {
  display: flex;

  justify-content: space-between;

  margin:
    17px
    3px
    10px;

  color: #7f8ba2;

  font-size: 10px;

  font-weight: 800;

  letter-spacing: 1px;
}

.pieces-heading span:last-child {
  color: #a9b4c8;
}

.pieces-container {
  height: 100px;

  display: flex;

  align-items: center;

  justify-content: space-around;

  border:
    1px solid
    rgba(255, 255, 255, 0.05);

  border-radius: 16px;

  background:
    rgba(255, 255, 255, 0.025);
}

.piece-option {
  min-width: 100px;
  height: 88px;

  display: flex;

  align-items: center;
  justify-content: center;

  border-radius: 14px;

  cursor: pointer;

  transition:
    transform 0.16s ease,
    background 0.16s ease;
}

.piece-option:hover {
  background:
    rgba(255, 255, 255, 0.05);

  transform:
    translateY(-3px);
}

.piece-option.selected {
  background:
    rgba(121, 92, 255, 0.13);

  box-shadow:
    inset
    0 0 0 1px
    rgba(121, 92, 255, 0.35);
}

.mini-grid {
  display: grid;

  gap: 4px;
}

.mini-cell {
  width: 18px;
  height: 18px;

  border-radius: 4px;

  box-shadow:
    inset
    3px
    3px
    4px
    rgba(255, 255, 255, 0.16),

    inset
    -3px
    -3px
    4px
    rgba(0, 0, 0, 0.18);
}


/* =========================
   MESSAGE
========================= */

.game-message {
  min-height: 25px;

  padding-top: 12px;

  text-align: center;

  color: #78869d;

  font-size: 11px;
}


/* =========================
   INFORMATION
========================= */

.information-section {
  display: grid;

  grid-template-columns:
    1fr
    1fr;

  gap: 20px;
}

.information-card {
  padding: 28px;

  border:
    1px solid
    var(--border);

  border-radius: 22px;

  background:
    rgba(17, 24, 39, 0.72);
}

.information-card h2 {
  margin-bottom: 10px;

  font-size: 23px;
}

.information-card p {
  color: var(--muted);

  font-size: 14px;

  line-height: 1.7;
}


/* =========================
   STEPS
========================= */

.steps {
  display: grid;

  grid-template-columns:
    repeat(3, 1fr);

  gap: 10px;

  margin-top: 20px;
}

.step {
  padding: 12px;

  border-radius: 13px;

  background:
    rgba(255, 255, 255, 0.035);

  color: #aab4c7;

  font-size: 12px;
}

.step-number {
  width: 25px;
  height: 25px;

  margin-bottom: 8px;

  display: grid;

  place-items: center;

  border-radius: 50%;

  background:
    #795cff;

  color: white;

  font-weight: 700;
}


/* =========================
   TAGS
========================= */

.feature-tags {
  display: flex;

  flex-wrap: wrap;

  gap: 8px;

  margin-top: 19px;
}

.feature-tags span {
  padding:
    8px
    11px;

  border:
    1px solid
    rgba(121, 92, 255, 0.18);

  border-radius: 999px;

  background:
    rgba(121, 92, 255, 0.09);

  color: #b6aaff;

  font-size: 11px;
}


/* =========================
   FOOTER
========================= */

.site-footer {
  padding: 25px;

  border-top:
    1px solid
    var(--border);

  text-align: center;

  color: #68748a;

  font-size: 11px;
}


/* =========================
   TABLET
========================= */

@media (max-width: 850px) {

  .hero-section {
    grid-template-columns: 1fr;

    min-height: auto;

    gap: 28px;
  }

  .hero-content {
    padding: 5px;

    text-align: center;
  }

  .hero-content p {
    margin: auto;
  }

  .game-card {
    max-width: 620px;
  }

  .information-section {
    grid-template-columns: 1fr;
  }

}


/* =========================
   MOBILE
========================= */

@media (max-width: 560px) {

  .site-header {
    height: 60px;
  }

  .main-nav {
    display: none;
  }

  main {
    padding:
      27px
      10px
      50px;
  }

  .hero-content h1 {
    font-size: 43px;

    letter-spacing: -2px;
  }

  .hero-content p {
    font-size: 14px;
  }

  .game-card {
    padding: 12px;

    border-radius: 21px;
  }

  .score-box {
    min-width: 84px;
  }

  .score-box strong {
    font-size: 16px;
  }

  .game-board {
    gap: 4px;

    padding: 6px;

    border-radius: 14px;
  }

  .game-cell {
    border-radius: 4px;
  }

  .pieces-container {
    height: 88px;
  }

  .piece-option {
    min-width: 80px;

    height: 76px;
  }

  .mini-cell {
    width: 14px;
    height: 14px;
  }

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

  .information-card {
    padding: 22px;
  }

}