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

:root {
  --bg: #120e0b;
  --panel: #201712;
  --cream: #f4e6ce;
  --muted: #aa9a88;

  --gold: #d7a94d;
  --gold-light: #f0ca79;

  --light-square: #ead7b4;
  --dark-square: #75492f;

  --green: #8fb77b;
}

body {
  min-height: 100vh;

  background:
    radial-gradient(
      circle at 10% 5%,
      #3b2416,
      transparent 30%
    ),
    radial-gradient(
      circle at 90% 90%,
      #2d1c12,
      transparent 35%
    ),
    var(--bg);

  color: #fff8ed;

  font-family:
    "DM Sans",
    sans-serif;

  overflow-x: hidden;
}

body::before {
  content: "";

  position: fixed;
  inset: 0;

  pointer-events: none;

  opacity: 0.025;

  background-image:
    linear-gradient(
      45deg,
      #fff 25%,
      transparent 25%,
      transparent 75%,
      #fff 75%
    ),
    linear-gradient(
      45deg,
      #fff 25%,
      transparent 25%,
      transparent 75%,
      #fff 75%
    );

  background-size: 20px 20px;

  background-position:
    0 0,
    10px 10px;
}

button {
  font: inherit;
}

.app {
  width: min(1240px, 94%);
  margin: auto;
}


/* HEADER */

.topbar {
  min-height: 92px;

  display: flex;

  align-items: center;

  justify-content: space-between;

  gap: 18px;
}

.brand {
  display: flex;

  gap: 12px;

  align-items: center;

  color: inherit;

  text-decoration: none;
}

.brand-mark {
  width: 48px;
  height: 48px;

  border: 1px solid #d7a94d66;

  border-radius: 14px;

  display: grid;

  place-items: center;

  color: var(--gold-light);

  font-size: 25px;

  background: #d7a94d0d;
}

.brand small {
  display: block;

  color: var(--gold-light);

  font-size: 9px;

  letter-spacing: 2.5px;

  font-weight: 700;
}

.brand strong {
  font:
    700 25px
    "Playfair Display",
    serif;
}

.top-actions {
  display: flex;
  gap: 9px;
}

.ghost-btn,
.gold-btn,
.mode-btn {
  border-radius: 11px;

  padding: 10px 15px;

  border: 1px solid #ffffff11;

  background: #ffffff08;

  color: #eee;

  cursor: pointer;

  transition: 0.2s;
}

.ghost-btn:hover,
.mode-btn:hover {
  background: #ffffff15;

  transform: translateY(-2px);
}

.gold-btn {
  border: 0;

  background:
    linear-gradient(
      135deg,
      var(--gold-light),
      var(--gold)
    );

  color: #25170d;

  font-weight: 700;

  box-shadow:
    0 8px 22px
    #d7a94d22;
}

.gold-btn:hover {
  transform: translateY(-2px);
}


/* HERO */

.hero {
  display: flex;

  justify-content: space-between;

  align-items: center;

  padding: 48px 2% 38px;

  border-bottom:
    1px solid #ffffff10;
}

.eyebrow,
.mini-label {
  font-size: 9px;

  letter-spacing: 2.8px;

  color: var(--gold-light);

  font-weight: 700;
}

.hero h1 {
  font:
    700 clamp(42px, 6vw, 72px)
    "Playfair Display",
    serif;

  line-height: 0.98;

  margin: 13px 0;
}

.hero h1 em {
  color: var(--gold-light);

  font-style: normal;
}

.hero p {
  max-width: 560px;

  color: var(--muted);

  line-height: 1.7;

  font-size: 14px;
}

.hero-pattern {
  font-size: 62px;

  letter-spacing: 8px;

  color: #d7a94d18;

  writing-mode: vertical-rl;
}


/* MODE */

.mode-card {
  margin: 28px 0;

  padding: 18px 20px;

  border:
    1px solid #ffffff10;

  border-radius: 17px;

  background: #ffffff06;

  display: flex;

  justify-content: space-between;

  align-items: center;

  gap: 20px;
}

.mode-copy h2 {
  font:
    700 22px
    "Playfair Display",
    serif;

  margin: 3px 0;
}

.mode-copy p {
  color: var(--muted);

  font-size: 12px;
}

.mode-buttons {
  display: flex;

  gap: 8px;
}

.mode-btn.active {
  background: #d7a94d1c;

  color: var(--gold-light);

  border-color: #d7a94d55;
}


/* GAME */

.game-layout {
  display: grid;

  grid-template-columns:
    220px
    minmax(450px, 650px)
    220px;

  gap: 25px;

  align-items: start;

  justify-content: center;
}

.side-panel {
  border:
    1px solid #ffffff10;

  border-radius: 18px;

  background:
    linear-gradient(
      145deg,
      #281c15f5,
      #1b130ff5
    );

  padding: 19px;

  box-shadow:
    0 20px 60px #0004;
}

.player {
  display: flex;

  align-items: center;

  gap: 10px;

  padding-bottom: 16px;

  border-bottom:
    1px solid #ffffff10;
}

.avatar {
  width: 40px;
  height: 40px;

  border-radius: 12px;

  display: grid;

  place-items: center;

  font-size: 24px;
}

.black-avatar {
  background: #ffffff0a;

  color: #221912;
}

.white-avatar {
  background: #f4e6ce;

  color: #65432e;
}

.player small {
  font-size: 8px;

  letter-spacing: 2px;

  color: var(--muted);
}

.player h3 {
  font-size: 14px;
}

.dot {
  margin-left: auto;

  width: 7px;
  height: 7px;

  border-radius: 50%;

  background: #6c6259;
}

.active-dot {
  background: var(--green);

  box-shadow:
    0 0 10px
    #8fb77b;
}

.score-box {
  padding: 17px 0;
}

.score-box span {
  display: block;

  font-size: 8px;

  letter-spacing: 2px;

  color: var(--muted);
}

.score-box strong {
  display: block;

  color: var(--gold-light);

  font-size: 16px;

  margin: 4px 0 10px;
}

.progress {
  height: 4px;

  background: #ffffff10;

  border-radius: 99px;

  overflow: hidden;
}

.progress i {
  display: block;

  height: 100%;

  width: 50%;

  background: var(--gold);

  transition: 0.3s;
}

.captured-box {
  border-top:
    1px solid #ffffff10;

  padding-top: 15px;
}

.capture-title {
  display: flex;

  justify-content: space-between;

  color: var(--muted);

  font-size: 10px;
}

.capture-title b {
  color: var(--gold-light);
}

.captured-pieces {
  min-height: 38px;

  padding-top: 8px;

  line-height: 1.5;

  font-size: 18px;

  word-break: break-word;
}

.tip {
  display: flex;

  gap: 8px;

  margin-top: 18px;

  padding: 11px;

  border-radius: 12px;

  background: #d7a94d0a;

  color: var(--muted);

  font-size: 10px;

  line-height: 1.5;
}

.tip span {
  color: var(--gold-light);
}

.history-box {
  margin-top: 18px;
}

.section-title {
  display: flex;

  justify-content: space-between;

  color: var(--muted);

  font-size: 9px;

  letter-spacing: 1.8px;
}

.section-title button {
  border: 0;

  background: none;

  color: #777;

  cursor: pointer;
}

.history {
  margin-top: 10px;

  max-height: 210px;

  overflow: auto;

  font-size: 11px;

  color: #d5c8b8;

  line-height: 1.9;
}


/* BOARD */

.board-section {
  width: 100%;
}

.game-message {
  text-align: center;

  color: var(--cream);

  font-size: 13px;

  min-height: 24px;

  margin-bottom: 8px;
}

.board-frame {
  padding:
    12px
    10px
    8px;

  border:
    1px solid #d7a94d35;

  border-radius: 14px;

  background: #3d2618;

  box-shadow:
    0 28px 70px #0007;
}

.files {
  display: grid;

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

  text-align: center;

  color: #b99f7d;

  font-size: 9px;
}

.top-files {
  padding-bottom: 5px;
}

.bottom-files {
  padding-top: 5px;
}

.board-area {
  display: flex;
}

.ranks {
  width: 18px;

  display: grid;

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

  text-align: center;

  color: #b99f7d;

  font-size: 9px;
}

.board {
  width: 100%;

  aspect-ratio: 1;

  display: grid;

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

  border: 4px solid #4a2c1c;

  border-radius: 5px;

  overflow: hidden;
}

.square {
  position: relative;

  display: grid;

  place-items: center;

  cursor: pointer;

  user-select: none;

  font-size:
    clamp(
      30px,
      6vw,
      57px
    );

  transition: filter 0.12s;
}

.square.light {
  background: var(--light-square);
}

.square.dark {
  background: var(--dark-square);
}

.square:hover {
  filter: brightness(1.08);
}

.square.selected {
  box-shadow:
    inset 0 0 0 5px
    var(--gold-light);
}

.square.legal::after {
  content: "";

  width: 20%;

  aspect-ratio: 1;

  border-radius: 50%;

  background: #2b1d12aa;

  position: absolute;
}

.square.capture::after {
  content: "";

  position: absolute;

  inset: 7px;

  border:
    4px solid
    #b84c3d99;

  border-radius: 50%;
}

.piece {
  position: relative;

  z-index: 2;

  line-height: 1;

  text-shadow:
    0 3px 2px #0005;

  transition: 0.15s;
}

.square:hover .piece {
  transform:
    translateY(-2px);
}

.white-piece {
  color: #fff6e3;

  text-shadow:
    0 2px 1px #69482d,
    0 0 5px #fff5;
}

.black-piece {
  color: #241b15;

  text-shadow:
    0 1px 0 #fff3;
}

.last-move {
  box-shadow:
    inset 0 0 0 4px
    #f0ca7566;
}

.board-note {
  text-align: center;

  color: #766b61;

  font-size: 10px;

  margin-top: 9px;
}


/* FOOTER */

footer {
  display: flex;

  justify-content: space-between;

  color: #675d55;

  font-size: 10px;

  padding: 35px 0 25px;
}


/* MODAL */

.modal {
  position: fixed;

  inset: 0;

  background: #000a;

  display: grid;

  place-items: center;

  padding: 20px;

  z-index: 20;
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: min(390px, 100%);

  padding: 35px;

  text-align: center;

  border:
    1px solid
    #d7a94d55;

  border-radius: 22px;

  background: #211711;

  box-shadow:
    0 30px 100px #0008;
}

.modal-symbol {
  font-size: 60px;

  color: var(--gold-light);

  margin-bottom: 12px;
}

.modal-card h2 {
  font:
    700 30px
    "Playfair Display",
    serif;

  margin: 8px;
}

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

  font-size: 13px;

  margin-bottom: 22px;
}


/* RESPONSIVE */

@media (max-width: 850px) {

  .game-layout {
    grid-template-columns: 1fr;
  }

  .board-section {
    order: -1;
  }

  .left-panel,
  .right-panel {
    display: grid;

    grid-template-columns:
      1fr 1fr;

    gap: 14px;
  }

  .hero-pattern {
    display: none;
  }

  .mode-card {
    flex-direction: column;

    align-items: flex-start;
  }

}

@media (max-width: 520px) {

  .app {
    width: 96%;
  }

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

  .top-actions .ghost-btn {
    display: none;
  }

  .left-panel,
  .right-panel {
    display: block;
  }

  .left-panel > * + *,
  .right-panel > * + * {
    margin-top: 14px;
  }

  .mode-buttons {
    width: 100%;
  }

  .mode-btn {
    flex: 1;

    font-size: 11px;

    padding:
      9px 6px;
  }

  .board {
    border-width: 3px;
  }

  .ranks {
    width: 13px;
  }

}