:root {
    --board-size: min(62vh, 62vw);
    --menu-size: min(90vh, 90vw);
    --replay-board-size: min(62vh, 62vw);
}

body {
    margin: 0;
    overflow: hidden;
    background-color: #2C2C2C;
    transition: background-color 0.5s;
}

body.black-turn {
    background-color: #2C2C2C;
    --turn-bg: #2C2C2C;
    --scroll-thumb: #FFF8F1;
    --info-text: #F5F0E8;
}

body.white-turn {
    background-color: #FFF8F1;
    --turn-bg: #FFF8F1;
    --scroll-thumb: #242424;
    --info-text: #242424;
}

.screen {
    display: none;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#screen-menu {
    display: flex;
    height: 100vh;
    overflow: hidden;
    flex-direction: column;
    align-items: center;
    background-color: #FFF8F1;
    position: relative;
    isolation: isolate;
}

#menu-decal {
    position: absolute;
    left: 50%;
    top: 35%;
    transform: translate(-50%, -50%);
    width: clamp(260px, 40vw, 600px);
    pointer-events: none;
    user-select: none;
    z-index: -1;
}

#screen-game {
    height: 100vh;
    overflow: hidden;
    justify-content: center;
    align-items: center;
}

#transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 200;
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}

.icon-btn {
    border: none;
    background-color: transparent;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
    transition: transform 0.15s;
}

.icon-btn:hover {
    transform: scale(1.04);
}

.icon-btn:active {
    transform: scale(0.97);
}

.menu-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
}

.menu-title {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(1.8rem, calc(var(--menu-size) * 0.08), 5rem);
    letter-spacing: 0.2em;
    color: #242424;
    text-shadow: 0 calc(var(--menu-size) * 0.004) 0 #BEBEBE;
    margin: 0;
}

.menu-subtitle {
    font-family: "K2D", sans-serif;
    font-weight: 700;
    font-style: italic;
    font-size: clamp(0.6rem, calc(var(--menu-size) * 0.022), 1.1rem);
    letter-spacing: 0.2em;
    color: #242424;
    margin: 0.4em 0 0;
}

.menu-rule {
    width: clamp(280px, 35vw, 500px);
    border: none;
    border-top: calc(var(--menu-size) * 0.003) solid #242424;
    margin: clamp(10px, calc(var(--menu-size) * 0.02), 22px) 0;
}

.menu-desc {
    width: clamp(280px, 30vw, 500px);
    font-family: "K2D", sans-serif;
    font-weight: 400;
    font-size: clamp(0.7rem, calc(var(--menu-size) * 0.018), 0.9rem);
    line-height: 1.8;
    color: #242424;
    text-align: center;
    margin: 0;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, calc(var(--menu-size) * 0.016), 18px);
    margin-top: clamp(12px, calc(var(--menu-size) * 0.025), 32px);
}

#btn-play,
#btn-rulebook {
    width: clamp(150px, calc(var(--menu-size) * 0.28), 300px);
    height: clamp(40px, calc(var(--menu-size) * 0.072), 76px);
    background-size: contain;
}

#btn-play {
    background-image: url("assets/button-play.svg");
}

#btn-rulebook {
    background-image: url("assets/button-rulebook.svg");
}

.menu-footer {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: clamp(10px, calc(var(--menu-size) * 0.014), 22px);
}

.footer-text {
    font-family: "K2D", sans-serif;
    font-weight: 700;
    font-style: italic;
    font-size: clamp(10px, calc(var(--menu-size) * 0.016), 1rem);
    color: #242424;
    margin: 0.5em 0;
}

.footer-rule {
    width: clamp(80px, 10vw, 180px);
    border: none;
    border-top: calc(var(--menu-size) * 0.003) solid #242424;
    margin: 0;
}

#screen-rulebook {
    flex-direction: column;
    align-items: center;
    height: 100vh;
    background-color: #FFF8F1;
    overflow-y: auto;
    padding-bottom: clamp(16px, calc(var(--menu-size) * 0.03), 40px);
}

#rulebook-header {
    padding-top: clamp(16px, calc(var(--menu-size) * 0.03), 40px);
    text-align: center;
}

#rulebook-header .menu-title {
    font-size: clamp(1rem, calc(var(--menu-size) * 0.05), 2.8rem);
}

#rulebook-main {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: clamp(12px, calc(var(--menu-size) * 0.025), 32px) 0;
}

#rulebook-card {
    background-color: #FFE8CE;
    border: 5px solid #212121;
    border-radius: clamp(8px, calc(var(--menu-size) * 0.016), 14px);
    width: clamp(300px, 45vw, 620px);
    margin: 0 auto;
    padding: clamp(16px, calc(var(--menu-size) * 0.04), 40px);
    box-sizing: border-box;
}

#rulebook-title {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(0.8rem, calc(var(--menu-size) * 0.028), 1.4rem);
    letter-spacing: 0.15em;
    color: #242424;
    text-align: center;
    margin-top: 0;
    margin-bottom: 1em;
}

#rulebook-card h3 {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(0.7rem, calc(var(--menu-size) * 0.022), 1.1rem);
    letter-spacing: 0.1em;
    color: #242424;
    margin-top: 1.2em;
    margin-bottom: 0.3em;
}

#rulebook-card p,
#rulebook-card li {
    font-family: "K2D", sans-serif;
    font-weight: 400;
    font-size: clamp(0.65rem, calc(var(--menu-size) * 0.018), 0.9rem);
    line-height: 1.7;
    color: #242424;
    margin: 0 0 0.4em;
}

#rulebook-card ul {
    padding-left: 1.2em;
    margin: 0.3em 0;
}

img {
    user-select: none;
    -webkit-user-drag: none;
    pointer-events: none;
}

#board-container {
    display: grid;
    grid-template-columns: auto auto;
    margin-top: calc(var(--board-size) * 0.12);
    height: calc(var(--board-size) * 1.35);
    align-content: start;
}

#row-labels {
    display: flex;
    flex-direction: column;
}

#col-labels {
    display: flex;
    flex-direction: row;
    grid-column: 2;
}

.board-label {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "K2D", sans-serif;
    font-weight: 800;
    color: #FFF8F1;
    font-size: calc(var(--board-size) / 11 * 0.3);
    user-select: none;
}

.row-label {
    height: calc(var(--board-size) / 11);
    width: calc(var(--board-size) / 11 * 0.6);
}

.col-label {
    width: calc(var(--board-size) / 11);
    height: calc(var(--board-size) / 11 * 0.6);
}

#board {
    display: grid;
    grid-template-columns: repeat(11, 1fr);
    background-color: #242424;
    width: var(--board-size);
    height: var(--board-size);
    outline: calc(var(--board-size) * 0.005) solid #242424;
    border-radius: calc(var(--board-size) * 0.005);
}

.cell img {
    display: block;
    width: 100%;
    height: 100%;
}

.cell {
    position: relative;
    outline: none;
}

.piece {
    position: absolute;
    top: 0;
    left: 0;
    transform: scale(0.9);
}

.highlight {
    position: absolute;
    top: -3%;
    left: 0;
    transform: scale(0.85);
}

.move-highlight {
    position: absolute;
    top: 0;
    left: 0;
    transform: scale(0.4);
}

.cell:focus-visible::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: calc(var(--board-size) * 0.008) solid #ffbb00;
    box-sizing: border-box;
    pointer-events: none;
    z-index: 10;
}
#info-board {
    grid-column: 2;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    max-height: calc(var(--board-size) * 0.25);
    width: calc(var(--board-size) * 0.7);
    justify-self: center;
    align-self: end;
    margin-top: auto;
    margin-bottom: calc(var(--board-size) * 0.05);
    padding: calc(var(--board-size) * 0.07);
    padding-top: calc(var(--board-size) * 0.005);
    padding-bottom: calc(var(--board-size) * 0.005);
    box-sizing: border-box;
    font-family: "K2D", sans-serif;
    font-style: normal;
    font-size: clamp(12px, calc(var(--board-size) / 11 * 0.2), 20px);
    color: var(--info-text, #242424);
    border-left: calc(var(--board-size) * 0.007) solid var(--info-text, #242424);
    border-right: calc(var(--board-size) * 0.007) solid var(--info-text, #242424);
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb, #FFF8F1) var(--turn-bg, #2C2C2C);
    transition: color 0.5s, border-color 0.5s, scrollbar-color 0.5s;
}

#info-board::-webkit-scrollbar {
    width: clamp(4px, calc(var(--board-size) * 0.008), 10px);
}

#info-board::-webkit-scrollbar-track {
    background: var(--turn-bg, #2C2C2C);
}

#info-board::-webkit-scrollbar-thumb {
    background-color: var(--scroll-thumb, #FFF8F1);
    border-radius: calc(var(--board-size) * 0.004);
}

#info-board::-webkit-scrollbar-button {
    display: none;
}

#info-board:focus {
    outline: 2px solid #7A5C00;
    outline-offset: 2px;
}

.log-block {
    line-height: 1.4;
    margin-top: calc(var(--board-size) * 0.008);
}

.log-block:first-child {
    margin-top: 0;
}

.log-turn-header {
    font-size: 1.1em;
}

.log-turn-entry {
    padding-left: calc(var(--board-size) * 0.015);
    font-size: 0.9em;
}

.piece-captured {
    transition: transform 0.3s ease;
}

.log-turn-indicator {
    font-style: bold;
    font-size: 1.05em;
    margin-top: calc(var(--board-size) * 0.006);
}

.log-winner {
    color: #7A5C00;
    font-weight: 800;
    font-size: 1.1em;
    margin-top: calc(var(--board-size) * 0.006);
}

#game-over-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s;
    pointer-events: none;
}

.game-over-winner {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(1.8rem, calc(var(--menu-size) * 0.08), 5rem);
    letter-spacing: 0.2em;
    text-shadow: 0 calc(var(--menu-size) * 0.004) 0 #BEBEBE;
    text-transform: uppercase;
}

.game-over-sub {
    font-family: "K2D", sans-serif;
    font-size: clamp(0.8rem, calc(var(--board-size) * 0.04), 3rem);
    text-transform: uppercase;
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, calc(var(--menu-size) * 0.016), 18px);
    margin-top: clamp(12px, calc(var(--menu-size) * 0.025), 32px);
}

#btn-play-again,
#btn-main-menu,
#btn-watch-replay {
    width: clamp(150px, calc(var(--menu-size) * 0.28), 300px);
    height: clamp(40px, calc(var(--menu-size) * 0.072), 76px);
    background-size: contain;
}

#btn-play-again {
    background-image: url("assets/button-play-again.svg");
}

#btn-main-menu {
    background-image: url("assets/button-main-menu.svg");
}

#btn-watch-replay {
    background-image: url("assets/button-watch-replay.svg");
}

#btn-back {
    display: none;
    position: fixed;
    top: clamp(8px, calc(var(--board-size) * 0.03), 30px);
    left: clamp(8px, calc(var(--board-size) * 0.03), 30px);
    width: clamp(40px, calc(var(--board-size) * 0.12), 100px);
    height: clamp(40px, calc(var(--board-size) * 0.12), 100px);
    background-image: url("assets/button-back.svg");
    background-size: contain;
    z-index: 50;
}

#btn-back-portfolio {
    position: fixed;
    top: clamp(8px, calc(var(--board-size) * 0.03), 30px);
    left: clamp(8px, calc(var(--board-size) * 0.03), 30px);
    width: clamp(40px, calc(var(--board-size) * 0.12), 100px);
    height: clamp(40px, calc(var(--board-size) * 0.12), 100px);
    background-image: url("assets/button-back.svg");
    background-size: contain;
    z-index: 50;
}

#screen-replay {
    height: 100vh;
    overflow: hidden;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #FFF8F1;
}

#replay-controls {
    margin-left: calc(var(--replay-board-size) / 11 * 0.6);
    width: var(--replay-board-size);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: calc(var(--replay-board-size) * 0.04);
    margin-bottom: calc(var(--replay-board-size) * 0.02);
}

#btn-replay-prev,
#btn-replay-next {
    width: calc(var(--replay-board-size) * 0.1);
    height: calc(var(--replay-board-size) * 0.1);
    background-size: auto calc(var(--replay-board-size) * 0.074);
    transition: transform 0.15s, opacity 0.2s;
}

#btn-replay-prev {
    background-image: url("assets/button-prev.svg");
}

#btn-replay-next {
    background-image: url("assets/button-next.svg");
}

#btn-replay-play-pause {
    width: calc(var(--replay-board-size) * 0.1);
    height: calc(var(--replay-board-size) * 0.1);
    background-image: url("assets/button-icon-play.svg");
    background-size: auto calc(var(--replay-board-size) * 0.074);
}

#replay-board-container {
    display: grid;
    grid-template-columns: auto auto;
    height: calc(var(--replay-board-size) * 1.35);
    align-content: start;
}

#replay-row-labels {
    display: flex;
    flex-direction: column;
}

#replay-col-labels {
    display: flex;
    flex-direction: row;
    grid-column: 2;
}

#replay-row-labels .row-label {
    height: calc(var(--replay-board-size) / 11);
    width: calc(var(--replay-board-size) / 11 * 0.6);
}

#replay-col-labels .col-label {
    width: calc(var(--replay-board-size) / 11);
    height: calc(var(--replay-board-size) / 11 * 0.6);
}

#replay-row-labels .board-label,
#replay-col-labels .board-label {
    font-size: calc(var(--replay-board-size) / 11 * 0.3);
    color: #242424;
}

#replay-board {
    display: grid;
    grid-template-columns: repeat(11, 1fr);
    background-color: #242424;
    width: var(--replay-board-size);
    height: var(--replay-board-size);
    outline: calc(var(--replay-board-size) * 0.005) solid #242424;
    border-radius: calc(var(--replay-board-size) * 0.005);
}

#replay-log {
    grid-column: 2;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    max-height: calc(var(--board-size) * 0.25);
    width: calc(var(--board-size) * 0.7);
    justify-self: center;
    align-self: end;
    margin-top: auto;
    margin-bottom: calc(var(--board-size) * 0.05);
    padding: calc(var(--replay-board-size) * 0.07);
    padding-top: calc(var(--replay-board-size) * 0.005);
    padding-bottom: calc(var(--replay-board-size) * 0.005);
    box-sizing: border-box;
    font-family: "K2D", sans-serif;
    font-style: normal;
    font-size: clamp(12px, calc(var(--replay-board-size) / 11 * 0.2), 20px);
    color: #242424;
    border-left: calc(var(--board-size) * 0.007) solid #242424;
    border-right: calc(var(--board-size) * 0.007) solid #242424;
    scrollbar-width: thin;
    scrollbar-color: #242424 #FFF8F1;
}

#replay-log::-webkit-scrollbar {
    width: clamp(4px, calc(var(--board-size) * 0.008), 10px);
}

#replay-log::-webkit-scrollbar-track {
    background: #FFF8F1;
}

#replay-log::-webkit-scrollbar-thumb {
    background-color: #242424;
    border-radius: calc(var(--board-size) * 0.004);
}

#replay-log::-webkit-scrollbar-button {
    display: none;
}

#confirm-modal {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(36, 36, 36, 0.5);
}

.confirm-card {
    background-color: #FFE8CE;
    border: 5px solid #212121;
    border-radius: clamp(8px, calc(var(--menu-size) * 0.016), 14px);
    padding: clamp(16px, calc(var(--menu-size) * 0.04), 40px);
    width: clamp(260px, 35vw, 480px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, calc(var(--menu-size) * 0.015), 20px);
    box-sizing: border-box;
}

.confirm-message {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(0.7rem, calc(var(--menu-size) * 0.022), 1.1rem);
    color: #242424;
    text-align: center;
    margin: 0;
}

.confirm-buttons {
    display: flex;
    flex-direction: row;
    gap: clamp(8px, calc(var(--menu-size) * 0.015), 20px);
    justify-content: center;
}

.confirm-btn {
    height: clamp(28px, calc(var(--menu-size) * 0.05), 52px);
    width: clamp(70px, calc(var(--menu-size) * 0.13), 144px);
    background-size: contain;
}

#btn-confirm-yes {
    background-image: url("assets/button-yes.svg");
}

#btn-confirm-no {
    background-image: url("assets/button-no.svg");
}

.text-btn {
    font-family: "K2D", sans-serif;
    font-weight: 800;
    font-size: clamp(0.7rem, calc(var(--menu-size) * 0.02), 1rem);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #FFF8F1;
    background-color: #242424;
    border: none;
    border-radius: clamp(6px, calc(var(--menu-size) * 0.012), 10px);
    padding: clamp(8px, calc(var(--menu-size) * 0.016), 14px) clamp(20px, calc(var(--menu-size) * 0.04), 40px);
    cursor: pointer;
    transition: transform 0.15s;
}

.text-btn:hover {
    transform: scale(1.04);
}

.text-btn:active {
    transform: scale(0.97);
}