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

:root {
    --lcars-bg: #05070f;
    --lcars-panel: #0f1525;
    --lcars-panel-dark: #0b111f;
    --lcars-text: #f4f7ff;
    --lcars-muted: #9aa5c2;
    --lcars-orange: #ff9f65;
    --lcars-pink: #ff5f9a;
    --lcars-blue: #58b6ff;
    --lcars-gold: #f5c15b;
    --lcars-violet: #a67bff;
    --lcars-alert: #ff6b6b;
    --lcars-border: rgba(255, 255, 255, 0.08);
    --square-light: #f3ecd7;
    --square-dark: #776255;
}

body {
    font-family: 'Rajdhani', 'Share Tech Mono', system-ui, sans-serif;
    background: var(--lcars-bg);
    color: var(--lcars-text);
    min-height: 100vh;
    display: flex;
    align-items: stretch;
    justify-content: center;
    padding: 24px;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(ellipse at top right, rgba(255, 159, 101, 0.04) 0%, transparent 50%),
                radial-gradient(ellipse at bottom left, rgba(88, 182, 255, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.lcars-frame {
    position: relative;
    z-index: 1;
    width: min(1200px, 100%);
}


.lcars-status {
    display: flex;
    gap: 12px;
    align-items: center;
}

.lcars-status[data-player="white"] .lcars-status__name:last-child,
.lcars-status[data-player="black"] .lcars-status__name:first-child {
    color: var(--lcars-orange);
}

.lcars-status__name {
    font-family: 'Share Tech Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: rgba(255,255,255,0.3);
    font-size: 0.8rem;
    transition: color 0.2s ease;
}

.lcars-main {
    background: var(--lcars-panel);
    border-radius: 16px;
    padding: 24px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.06);
}

.lcars-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.lcars-header__center {
    flex: 1;
}

.lcars-header__right {
    display: flex;
    align-items: center;
}

.lcars-title {
    font-size: 1.4rem;
    letter-spacing: 0.25em;
    color: var(--lcars-orange);
    text-transform: uppercase;
    font-weight: 600;
}

.lcars-core {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
    gap: 24px;
}

.lcars-panel {
    background: var(--lcars-panel-dark);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.06);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.lcars-panel__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 14px 20px 8px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
    color: var(--lcars-muted);
    background: rgba(0,0,0,0.15);
}

.lcars-panel__title {
    color: var(--lcars-orange);
    font-weight: 700;
}

.lcars-panel__body {
    padding: 16px 20px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.board-wrapper {
    padding: 16px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
}

.board-surface {
    border-radius: 6px;
    padding: 12px;
    background: rgba(0,0,0,0.3);
}

#chessboard {
    --board-cols: 8;
    --board-rows: 8;
    width: min(70vw, 520px);
    aspect-ratio: 1 / 1;
    display: grid;
    grid-template-columns: repeat(var(--board-cols), minmax(0, 1fr));
    grid-template-rows: repeat(var(--board-rows), minmax(0, 1fr));
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.square {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    aspect-ratio: 1 / 1;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease;
}

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

.square:hover { transform: translateY(-1px); filter: brightness(1.06); }

.square.selected {
    outline: 3px solid var(--lcars-blue);
    outline-offset: -3px;
}

.square.possible-move::after {
    content: '';
    position: absolute;
    width: 30%;
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    background: rgba(88, 182, 255, 0.45);
    box-shadow: 0 0 0 6px rgba(88, 182, 255, 0.2);
}

.square.possible-move:has(.piece)::after {
    width: 70%;
    border-radius: 18px;
    background: rgba(255, 95, 154, 0.2);
    border: 3px solid rgba(255, 95, 154, 0.6);
    box-shadow: 0 0 0 6px rgba(255, 95, 154, 0.18);
}

.piece {
    font-size: clamp(2.4rem, 5vw, 3.4rem);
    cursor: grab;
    user-select: none;
    -webkit-user-drag: element;
    font-family: 'Noto Sans Symbols 2', 'Noto Sans Symbols', 'Segoe UI Symbol', sans-serif;
    line-height: 1;
    transition: transform 0.18s ease, opacity 0.2s ease;
}

.piece:hover:not(.dragging) { transform: translateY(-2px) scale(1.06); }
.piece:active:not(.dragging) { cursor: grabbing; }

.piece.dragging {
    opacity: 0.5;
    pointer-events: none;
}

.square.drag-over {
    background-blend-mode: lighten;
    filter: brightness(1.15);
}

.piece-white {
    color: #ffffff;
    text-shadow: 0 0 8px rgba(0,0,0,0.8),
                 0 0 16px rgba(0,0,0,0.6),
                 0 2px 4px rgba(0,0,0,0.9);
    filter: drop-shadow(0 0 2px rgba(0,0,0,0.9));
}

.piece-black {
    color: #161d2a;
    text-shadow: 0 2px 12px rgba(0,0,0,0.45);
}

.lcars-readout {
    font-size: 1.3rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--lcars-blue);
    font-weight: 700;
}

.lcars-alert {
    min-height: 1.4em;
    font-size: 1rem;
    letter-spacing: 0.14em;
    color: var(--lcars-alert);
    text-transform: uppercase;
}

.lcars-panel--briefing {
    background: rgba(166, 123, 255, 0.05);
    border-left: 3px solid var(--lcars-violet);
}

.rules-briefing-content {
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--lcars-text);
}

.rules-briefing-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.rules-briefing-content li {
    padding-left: 12px;
    position: relative;
    letter-spacing: 0.04em;
    font-size: 0.85rem;
}

.rules-briefing-content li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--lcars-violet);
    font-size: 1.1em;
    font-weight: 700;
}

.rules-briefing-content li:first-child,
.rules-briefing-content li:nth-child(2) {
    font-weight: 600;
    color: var(--lcars-orange);
    font-size: 0.9rem;
    font-family: 'Noto Sans Symbols 2', 'Noto Sans Symbols', 'Segoe UI Symbol', sans-serif;
}

.lcars-controls {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.lcars-btn {
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    cursor: pointer;
    transition: all 0.15s ease;
    font-weight: 600;
}

.lcars-btn--primary { background: var(--lcars-orange); color: #05070f; }
.lcars-btn--accent { background: var(--lcars-violet); color: #05070f; }
.lcars-btn--secondary { background: var(--lcars-pink); color: #05070f; }
.lcars-btn--tertiary { background: var(--lcars-blue); color: #05070f; }

.lcars-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    filter: brightness(1.1);
}

.lcars-btn:disabled { background: rgba(150,150,150,0.3); color: rgba(255,255,255,0.5); cursor: not-allowed; box-shadow: none; }

.lcars-history {
    max-height: 380px;
    overflow-y: auto;
    display: grid;
    gap: 10px;
    padding-right: 6px;
}

.lcars-history::-webkit-scrollbar { width: 10px; }
.lcars-history::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.14); border-radius: 10px; }

.move-pair {
    font-family: 'Share Tech Mono', monospace;
    padding: 6px 10px;
    border-radius: 4px;
    background: rgba(88, 182, 255, 0.08);
    color: var(--lcars-text);
    letter-spacing: 0.1em;
    font-size: 0.9rem;
}

.move-pair:nth-child(odd) { background: rgba(255, 159, 101, 0.1); }


/* Modal styling */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(5,7,15,0.88);
    backdrop-filter: blur(6px);
    padding: 28px;
    place-items: center;
    overflow-y: auto;
}

.modal-content {
    background: var(--lcars-panel);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
    width: min(620px, 100%);
    padding: 32px;
    color: var(--lcars-text);
    box-shadow: 0 16px 48px rgba(0,0,0,0.6);
}

.modal-content--rules {
    width: min(720px, 100%);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.modal-content--promotion {
    width: min(580px, 100%);
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    text-transform: uppercase;
    letter-spacing: 0.24em;
}

.status-eyebrow {
    display: block;
    font-size: 0.7rem;
    letter-spacing: 0.32em;
    color: var(--lcars-muted);
    margin-bottom: 8px;
}

.modal-close {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--lcars-pink);
    color: #05070f;
    font-size: 1.4rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: transform 0.15s ease;
}

.modal-close:hover { transform: rotate(6deg) scale(1.05); }

.rules-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    padding-right: 6px;
    flex: 1 1 auto;
}

.rule-section {
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: rgba(255,255,255,0.015);
    border-radius: 10px;
    padding: 16px 18px 18px;
    border: 1px solid rgba(255,255,255,0.04);
}

.rule-section h4 {
    text-transform: uppercase;
    letter-spacing: 0.24em;
    font-size: 0.95rem;
    color: var(--lcars-orange);
}

.rule-subsection {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.rule-subsection + .rule-subsection {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 12px;
}

.rule-subsection h5 {
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: 0.8rem;
    color: var(--lcars-muted);
}

.rule-list,
.rule-radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.rule-list--compact { gap: 10px; }

.rule-field,
.rule-option,
.rule-radio {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255,255,255,0.05);
    cursor: pointer;
    transition: all 0.15s ease;
}

.rule-field:hover,
.rule-option:hover,
.rule-radio:hover {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(255,159,101,0.4);
}

.rule-field select {
    background: rgba(5,7,15,0.75);
    color: var(--lcars-text);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;
    padding: 10px 14px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.rule-option input,
.rule-radio input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.rule-toggle,
.rule-bullet {
    width: 48px;
    height: 22px;
    border-radius: 22px;
    border: 1px solid rgba(255,255,255,0.14);
    position: relative;
    flex: 0 0 auto;
}

.rule-toggle::after,
.rule-bullet::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 4px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: rgba(255,255,255,0.7);
    transform: translate(0, -50%);
    transition: transform 0.25s ease, background 0.25s ease;
}

.rule-option input:checked ~ .rule-toggle {
    border-color: var(--lcars-blue);
    background: rgba(88, 182, 255, 0.25);
}

.rule-option input:checked ~ .rule-toggle::after {
    transform: translate(22px, -50%);
    background: var(--lcars-blue);
}

.rule-bullet {
    border: 2px solid rgba(255,255,255,0.18);
}

.rule-bullet::after {
    width: 10px;
    height: 10px;
    left: 50%;
    transform: translate(-50%, -50%);
    background: transparent;
}

.rule-radio input:checked ~ .rule-bullet {
    border-color: var(--lcars-pink);
}

.rule-radio input:checked ~ .rule-bullet::after {
    background: var(--lcars-pink);
}

.rule-copy {
    display: flex;
    flex-direction: column;
    gap: 4px;
    letter-spacing: 0.08em;
}

.rule-title {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.85rem;
}

.rule-hint {
    font-size: 0.78rem;
    color: var(--lcars-muted);
    letter-spacing: 0.16em;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.modal-actions .lcars-btn {
    border-radius: 18px;
}

.promotion-pieces {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding: 0 12px 12px;
}

.promotion-piece {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 14px 16px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.promotion-piece:hover {
    transform: translateY(-2px);
    background: rgba(255,159,101,0.15);
    border-color: var(--lcars-orange);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

.promotion-piece__icon {
    font-size: 3.5rem;
    font-family: 'Noto Sans Symbols 2', 'Noto Sans Symbols', 'Segoe UI Symbol', sans-serif;
    line-height: 1;
    color: var(--lcars-text);
    text-shadow: 0 4px 16px rgba(255,255,255,0.25);
}

.promotion-piece__label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.28em;
    color: var(--lcars-blue);
    font-weight: 600;
}

@media (max-width: 1080px) {
    body { padding: 16px; }
    .lcars-main { border-radius: 12px; }
    .lcars-core { grid-template-columns: 1fr; }
    #chessboard { width: min(88vw, 520px); }
}

@media (max-width: 620px) {
    .lcars-main { padding: 16px; }
    .lcars-header { flex-direction: column; gap: 10px; align-items: flex-start; }
    .lcars-status { flex-direction: column; gap: 6px; align-items: flex-start; }
    .lcars-controls { flex-direction: column; }
    .lcars-panel__body { padding: 14px; }
    .promotion-pieces { grid-template-columns: repeat(2, 1fr); }
}

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