:root {
  --font: "Be Vietnam Pro", Arial, sans-serif;
  --glyph: "Noto Sans Symbols 2", "Segoe UI Symbol", "DejaVu Sans", sans-serif;
  --light: #ebecd0;
  --dark: #779556;
  --hl: rgba(255, 255, 50, 0.45);
  --accent: #81b64c;
}
.theme-wood {
  --light: #f0d9b5;
  --dark: #b58863;
  --hl: rgba(255, 220, 40, 0.5);
}
.theme-blue {
  --light: #dee3e6;
  --dark: #8ca2ad;
  --hl: rgba(120, 200, 255, 0.5);
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
html,
body {
  margin: 0;
  min-height: 100%;
}
body {
  min-height: 100vh;
  background: radial-gradient(ellipse at 50% 0%, #3d3a36, #262421 70%);
  font-family: var(--font);
  color: #f3f1ec;
}
button {
  font-family: var(--font);
  cursor: pointer;
}

.wrap {
  width: min(1080px, 100%);
  margin: 0 auto;
  padding: 14px 14px 22px;
}
.top {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}
.back {
  color: #bdb8ae;
  font-weight: 700;
  text-decoration: none;
  font-size: 14px;
}
.top h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
}
.top .sub {
  font-family: var(--glyph);
  font-size: 26px;
  color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: auto 310px;
  gap: 18px;
  align-items: start;
  justify-content: center;
}
.board-col {
  width: min(620px, calc(100vw - 28px), calc(100vh - 160px));
  width: min(620px, calc(100vw - 28px), calc(100dvh - 160px));
  min-width: 280px;
  display: grid;
  gap: 8px;
}

/* ---------- Thanh người chơi ---------- */
.player {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 46px;
  padding: 0 12px 0 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  transition:
    background 0.25s,
    box-shadow 0.25s;
}
.player.active {
  background: rgba(129, 182, 76, 0.16);
  box-shadow: inset 0 0 0 2px var(--accent);
}
.avatar {
  width: 36px;
  height: 36px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 6px;
  font: 28px/1 var(--glyph);
}
.avatar.w {
  background: #f0efe9;
  color: #262421;
}
.avatar.b {
  background: #3b3936;
  color: #f0efe9;
}
.pinfo {
  min-width: 0;
  flex: 1;
  display: grid;
}
.pname {
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.pcap {
  display: flex;
  align-items: center;
  min-height: 18px;
  font: 17px/1 var(--glyph);
  color: #bdb8ae;
  letter-spacing: -4px;
}
.pcap b {
  margin-left: 8px;
  font: 700 12px var(--font);
  letter-spacing: 0;
  color: #bdb8ae;
}
.pturn {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
}
.player.active .pturn {
  opacity: 1;
}

/* ---------- Bàn cờ ---------- */
.board {
  position: relative;
  container-type: inline-size;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
#squares {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
}
.sq {
  position: relative;
  background: var(--light);
}
.sq.d {
  background: var(--dark);
}
.sq .rk,
.sq .fl {
  position: absolute;
  font: 700 2.1cqw/1 var(--font);
  color: var(--dark);
}
.sq.d .rk,
.sq.d .fl {
  color: var(--light);
}
.sq .rk {
  left: 0.5cqw;
  top: 0.45cqw;
}
.sq .fl {
  right: 0.55cqw;
  bottom: 0.4cqw;
}

/* dấu trên ô */
.mk {
  position: absolute;
  width: 12.5%;
  height: 12.5%;
}
.mk.hl {
  background: var(--hl);
}
.mk.sel {
  background: rgba(255, 255, 50, 0.55);
}
.mk.check {
  background: radial-gradient(circle, rgba(255, 0, 0, 0.95) 0%, rgba(231, 0, 0, 0.6) 30%, rgba(169, 0, 0, 0) 72%);
}
.mk.dot::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 33%;
  height: 33%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.16);
  transform: translate(-50%, -50%);
}
.mk.cap::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 0.85cqw rgba(0, 0, 0, 0.16);
}
.mk.over {
  box-shadow: inset 0 0 0 0.55cqw rgba(255, 255, 255, 0.75);
}
.mk.hint {
  background: rgba(40, 170, 255, 0.45);
  animation: blink 0.8s ease-in-out infinite alternate;
}

/* ---------- Quân cờ: 2 lớp ký hiệu (đặc + viền) để có nét bên trong ---------- */
.pc {
  position: absolute;
  width: 12.5%;
  height: 12.5%;
  display: grid;
  place-items: center;
  transition:
    left 0.2s ease,
    top 0.2s ease,
    opacity 0.2s;
  z-index: 1;
  pointer-events: none;
}
.pc span {
  grid-area: 1 / 1;
  font: 10.4cqw/1 var(--glyph);
  margin-top: -0.6cqw;
}
.pc.w .fill {
  color: #fff;
}
.pc.w .line {
  color: #1d1d1b;
}
.pc.b .fill {
  color: #262421;
}
.pc.b .line {
  color: #6e6a64;
}
.pc .fill {
  filter: drop-shadow(0 0.35cqw 0.25cqw rgba(0, 0, 0, 0.35));
}
.pc.moving {
  z-index: 4;
}
.pc.drag {
  z-index: 6;
  transition: none;
  transform: scale(1.12);
}
.pc.dead {
  opacity: 0;
}
.pc.ghost {
  opacity: 0.35;
}

/* ---------- Phong cấp ---------- */
.promo {
  position: absolute;
  inset: 0;
  z-index: 9;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.5);
}
.promo-card {
  padding: 12px 14px 14px;
  border-radius: 12px;
  background: #f3f1ec;
  color: #262421;
  text-align: center;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.5);
  animation: pop 0.25s cubic-bezier(0.3, 1.5, 0.5, 1);
}
.promo-card p {
  margin: 0 0 8px;
  font-weight: 800;
}
.promo-row {
  display: flex;
  gap: 8px;
}
.promo-row button {
  width: 13cqw;
  height: 13cqw;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: #e2ded5;
}
.promo-row button:hover {
  background: var(--accent);
}
.promo-row .pc {
  position: static;
  width: 100%;
  height: 100%;
}

/* ---------- Kết quả ---------- */
.result {
  position: absolute;
  inset: 0;
  z-index: 8;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.42);
  animation: fade 0.3s;
}
@keyframes fade {
  from {
    opacity: 0;
  }
}
@keyframes pop {
  from {
    transform: scale(0.7);
    opacity: 0;
  }
}
@keyframes blink {
  to {
    opacity: 0.35;
  }
}
.result-card {
  width: min(78%, 330px);
  padding: 22px 20px 18px;
  border-radius: 14px;
  background: #f3f1ec;
  color: #262421;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  animation: pop 0.35s cubic-bezier(0.3, 1.5, 0.5, 1);
}
.result-ico {
  font-size: 46px;
  line-height: 1;
}
.result-card h2 {
  margin: 8px 0 4px;
  font-size: 26px;
  font-weight: 800;
}
.result-card p {
  margin: 0 0 14px;
  color: #6e6a64;
  font-weight: 600;
}
.result-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ---------- Bảng điều khiển ---------- */
.panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border-radius: 12px;
  background: #312e2b;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}
.status {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 8px;
  background: #262421;
  font-weight: 700;
  font-size: 14px;
}
.status .dot {
  width: 14px;
  height: 14px;
  flex: none;
  border-radius: 3px;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.25);
}
.status .dot.w {
  background: #f0efe9;
}
.status .dot.b {
  background: #111;
}
.status.thinking .dot {
  animation: blink 0.7s ease-in-out infinite alternate;
}
.status.check {
  background: #7a1f1a;
}
.group {
  display: grid;
  gap: 6px;
}
.group label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9a968e;
}
.seg {
  display: flex;
  padding: 3px;
  border-radius: 8px;
  background: #262421;
}
.seg button {
  flex: 1;
  height: 34px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #bdb8ae;
  font-weight: 700;
  font-size: 13px;
}
.seg button.on {
  background: #4b4844;
  color: #fff;
}
/* ---------- Thẻ điểm xếp hạng ---------- */
.rank {
  display: grid;
  gap: 8px;
  padding: 12px;
  border-radius: 10px;
  background: linear-gradient(135deg, #3d3a2c, #2a2924);
  box-shadow: inset 0 0 0 1px rgba(255, 210, 90, 0.25);
}
.rank-top {
  display: flex;
  align-items: center;
  gap: 10px;
}
.rank-ico {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(255, 210, 90, 0.15);
  font: 26px/1 var(--glyph);
  color: #ffd25a;
}
.rank-name {
  flex: 1;
  display: grid;
}
.rank-name b {
  font-size: 16px;
  color: #ffd25a;
}
.rank-name small {
  font-size: 11px;
  color: #9a968e;
}
#rkElo {
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.rank-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
.rank-bar i {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, #f0a93a, #ffd25a);
  transition: width 0.6s ease;
}
.rank-next {
  font-size: 11px;
  color: #9a968e;
}
.rank-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  text-align: center;
  font-size: 11px;
  color: #9a968e;
}
.rank-stats b {
  display: block;
  font-size: 15px;
  color: #e9e6df;
}
.rank-stake {
  padding: 7px 8px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.25);
  font-size: 12px;
  font-weight: 600;
  color: #bdb8ae;
  text-align: center;
}
.rank-reset {
  justify-self: center;
  padding: 2px 8px;
  border: 0;
  background: none;
  color: #8f8a82;
  font-size: 12px;
  font-weight: 600;
  text-decoration: underline;
}
.rank-reset:hover {
  color: #e05b4b;
}
.up {
  color: #81b64c;
}
.down {
  color: #e05b4b;
}
.res-elo {
  margin: -6px 0 14px !important;
  padding: 8px;
  border-radius: 8px;
  background: #e8e4da;
  color: #262421 !important;
  line-height: 1.5;
}
.res-elo .up,
.res-elo .down {
  font-weight: 800;
}
.btn.wide {
  grid-column: 1 / -1;
}
.seg button {
  white-space: nowrap;
}
.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.btn {
  height: 40px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: #45423e;
  color: #e9e6df;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 3px 0 #2a2826;
}
.btn:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: none;
}
.btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.btn.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 3px 0 #45753c;
}
.result .btn {
  background: #dcd8cf;
  color: #262421;
  box-shadow: 0 3px 0 #b5b0a5;
}
.result .btn.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 3px 0 #45753c;
}
.moves h3 {
  margin: 4px 0 6px;
  font-size: 12px;
  font-weight: 800;
  color: #9a968e;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.moves ol {
  height: 200px;
  margin: 0;
  padding: 6px 8px 6px 34px;
  overflow-y: auto;
  border-radius: 8px;
  background: #262421;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: #8f8a82;
}
.moves li {
  padding: 2px 0;
}
.moves li:nth-child(odd) {
  background: rgba(255, 255, 255, 0.025);
}
.moves li span {
  display: inline-block;
  width: 46%;
  font-weight: 700;
  color: #e9e6df;
}
.moves li span i {
  font: normal 16px/1 var(--glyph);
}
.moves li.empty {
  list-style: none;
  margin-left: -26px;
  font-weight: 600;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  .board-col {
    width: min(620px, calc(100vw - 20px));
  }
  .panel {
    width: min(620px, 100%);
  }
  .moves ol {
    height: 140px;
  }
}
@media (max-width: 480px) {
  .wrap {
    padding: 10px 10px 18px;
  }
  .top h1 {
    font-size: 21px;
  }
}