@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;600&family=Playfair+Display:wght@600;700&display=swap");

:root {
    --bg-1: #0f1412;
    --bg-2: #1b241f;
    --accent: #c7a76c;
    --accent-strong: #e3c57c;
    --light: #f1e7d0;
    --dark: #5b3f2a;
    --panel: rgba(17, 22, 20, 0.88);
    --ink: #f7f3ea;
    --muted: #bfb6a1;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
    --board-size: clamp(280px, 70vmin, 620px);
}

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

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background:
        radial-gradient(circle at 20% 20%, rgba(199, 167, 108, 0.18), transparent 45%),
        radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.08), transparent 40%),
        linear-gradient(140deg, var(--bg-1), var(--bg-2));
    color: var(--ink);
    font-family: "IBM Plex Sans", system-ui, sans-serif;
    padding: 16px 16px;
    overflow-x: hidden;
    overflow-y: auto;
}

.stage {
    width: min(980px, 100%);
    display: grid;
    gap: 14px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 12px 18px;
    background: var(--panel);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.brand {
    text-transform: uppercase;
    letter-spacing: 0.24em;
    font-size: 12px;
    color: var(--muted);
}

h1 {
    font-family: "Playfair Display", serif;
    font-size: clamp(24px, 3.2vw, 34px);
    font-weight: 700;
    color: var(--accent-strong);
    margin-top: 4px;
}

.controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.online-controls {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
}

.online-controls input[type="text"] {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--ink);
    padding: 8px 10px;
    border-radius: 999px;
    width: 100%;
}

.online-controls input[type="text"]::placeholder {
    color: rgba(247, 243, 234, 0.6);
}

.spectate {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.16em;
}

.spectate input {
    accent-color: var(--accent);
}

.room-info {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.04em;
}

.presence {
    display: grid;
    gap: 8px;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.presence-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
}

.presence-stats {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
    color: var(--ink);
}

.spectator-list {
    display: grid;
    gap: 6px;
}

.spectator-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    font-size: 12px;
    color: var(--ink);
}

.spectator-item button {
    padding: 6px 10px;
    font-size: 11px;
}

.time-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 8px 12px;
    border-radius: 999px;
}

.time-control label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--muted);
}

.time-control select {
    background: transparent;
    color: var(--ink);
    border: none;
    font-weight: 600;
    outline: none;
}

.btn {
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 10px 18px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: #1b1b1b;
    box-shadow: 0 12px 25px rgba(199, 167, 108, 0.35);
}

.btn.ghost {
    background: transparent;
    color: var(--ink);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn:hover {
    transform: translateY(-1px);
}

.arena {
    background: rgba(0, 0, 0, 0.35);
    border-radius: 24px;
    padding: 16px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: grid;
    grid-template-columns: minmax(180px, 220px) minmax(320px, 1fr) minmax(200px, 240px);
    grid-template-areas: "left board right";
    gap: 16px;
    align-items: center;
}

.side-panel {
    grid-area: left;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 16px;
    min-height: 100%;
}

.mid-info {
    display: grid;
    gap: 6px;
}

.player-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 12px 18px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(20, 24, 23, 0.8);
    min-width: 140px;
}

.player-card.centered {
    align-items: center;
    text-align: center;
}

.player-card.black {
    border-color: rgba(255, 255, 255, 0.1);
}

.player-card.white {
    border-color: rgba(255, 255, 255, 0.2);
}

.player-card.active {
    box-shadow: 0 0 0 2px rgba(227, 197, 124, 0.6);
}

.label {
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.clock {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.status {
    font-size: 14px;
    color: var(--muted);
}

.note {
    font-size: 12px;
    color: var(--muted);
}

.board-panel {
    display: grid;
    gap: 12px;
    justify-items: center;
    width: min(var(--board-size), 100%);
    justify-self: center;
    grid-area: board;
}

.right-panel {
    grid-area: right;
    display: grid;
    gap: 12px;
    align-content: start;
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    background: rgba(20, 24, 23, 0.65);
}

.panel-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--muted);
}

.modal {
    position: fixed;
    inset: 0;
    display: none;
    place-items: center;
    background: rgba(10, 12, 11, 0.75);
    backdrop-filter: blur(6px);
    z-index: 50;
    padding: 24px;
}

.modal.open {
    display: grid;
}

.modal-card {
    width: min(560px, 92vw);
    background: var(--panel);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    padding: 18px 20px;
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.modal-header h2 {
    font-family: "Playfair Display", serif;
    font-size: 22px;
    color: var(--accent-strong);
}

.modal-list {
    display: grid;
    gap: 8px;
    padding-left: 18px;
    color: var(--ink);
}

.modal-list strong {
    color: var(--accent-strong);
}

.modal-note {
    margin-top: 12px;
    color: var(--muted);
    font-size: 12px;
}

.board {
    display: flex;
    flex-wrap: wrap;
    width: min(var(--board-size), 100%);
    aspect-ratio: 1 / 1;
    height: auto;
    border: clamp(8px, 2.4vmin, 16px) solid #2e2217;
    border-radius: clamp(12px, 2.6vmin, 18px);
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.1);
    margin: 0 auto;
}

.board div {
    width: calc(100% / 8);
    height: calc(100% / 8);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    transition: background 0.2s ease;
}

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

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

.board div.highlight {
    outline: 3px solid rgba(227, 197, 124, 0.9);
    outline-offset: -3px;
}

.board div.move-target::after {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(227, 197, 124, 0.65);
}

.board div.last-move {
    box-shadow: inset 0 0 0 4px rgba(227, 197, 124, 0.45);
}

.board div.capture-flash {
    animation: capture-flash 260ms ease-out;
}

.board img {
    width: 78%;
    height: 78%;
    pointer-events: none;
    user-select: none;
    filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.6)) drop-shadow(0 0 4px rgba(255, 255, 255, 0.35));
    transition: transform 0.18s ease, filter 0.18s ease;
}

.board div:hover img {
    transform: scale(1.06);
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.7)) drop-shadow(0 0 6px rgba(255, 255, 255, 0.45));
}

.piece-move {
    animation: piece-pop 180ms ease-out;
}

@keyframes piece-pop {
    0% {
        transform: scale(0.92);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes capture-flash {
    0% {
        box-shadow: inset 0 0 0 0 rgba(199, 167, 108, 0.0);
    }
    35% {
        box-shadow: inset 0 0 0 6px rgba(199, 167, 108, 0.6);
    }
    100% {
        box-shadow: inset 0 0 0 0 rgba(199, 167, 108, 0.0);
    }
}

.captured {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    min-height: clamp(44px, 8vmin, 56px);
    padding: 8px 12px;
    gap: 8px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(245, 236, 214, 0.85), rgba(220, 205, 170, 0.75));
}

.captured img {
    width: clamp(22px, 5vmin, 32px);
    height: clamp(22px, 5vmin, 32px);
    filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.5)) drop-shadow(0 0 3px rgba(255, 255, 255, 0.3));
}

@media (max-width: 1280px) {
    :root {
        --board-size: clamp(420px, 56vw, 620px);
    }

    .arena {
        grid-template-columns: minmax(200px, 240px) minmax(0, 1fr);
        grid-template-areas:
            "left board"
            "right right";
        align-items: start;
    }

    .right-panel {
        width: 100%;
    }
}

@media (max-width: 1024px) {
    :root {
        --board-size: clamp(360px, 72vw, 560px);
    }
}

@media (max-width: 860px) {
    .arena {
        grid-template-columns: 1fr;
        grid-template-areas:
            "black"
            "board"
            "white"
            "status"
            "right";
    }

    .side-panel {
        display: contents;
    }

    .player-card.black {
        grid-area: black;
    }

    .player-card.white {
        grid-area: white;
    }

    .mid-info {
        grid-area: status;
    }

    .player-card {
        width: min(240px, 100%);
        justify-self: center;
        padding: 8px 12px;
        border-radius: 10px;
        gap: 4px;
        min-width: 0;
    }

    .label {
        font-size: 10px;
        letter-spacing: 0.14em;
    }

    .clock {
        font-size: 18px;
        letter-spacing: 0.04em;
    }

    .status {
        font-size: 13px;
    }

    .note {
        font-size: 11px;
    }
}

@media (max-width: 720px) {
    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .controls {
        width: 100%;
        justify-content: flex-start;
        gap: 10px;
    }

    .btn {
        padding: 8px 14px;
        font-size: 13px;
    }

    .time-control {
        padding: 6px 10px;
    }

    .clock {
        font-size: 20px;
    }
}

@media (max-width: 520px) {
    body {
        padding: 12px;
    }

    .arena {
        padding: 12px;
        border-radius: 18px;
    }

    .topbar {
        padding: 10px 14px;
    }

    .label {
        font-size: 9px;
        letter-spacing: 0.12em;
    }

    .clock {
        font-size: 16px;
    }

    .player-card {
        width: min(210px, 100%);
        padding: 7px 10px;
    }
}