:root {
    --bg-start: #f4efe3;
    --bg-end: #d7c4a1;
    --panel: rgba(255, 252, 244, 0.92);
    --panel-strong: #fff9ee;
    --text: #2b2114;
    --muted: #6e5a45;
    --accent: #9f5c2c;
    --accent-dark: #6b3a18;
    --board-dark: #8b5e3c;
    --board-light: #f1d9b5;
    --board-outline: #4a2f1a;
    --select: #f0b429;
    --hint: rgba(24, 119, 78, 0.82);
    --capture: rgba(164, 46, 46, 0.85);
    --check: rgba(182, 36, 36, 0.85);
    --shadow: 0 18px 45px rgba(66, 41, 18, 0.16);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Georgia, "Times New Roman", serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.45), transparent 28%),
        linear-gradient(145deg, var(--bg-start), var(--bg-end));
}

button {
    font: inherit;
}

.app-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 40px;
}

.hero-panel,
.panel,
.board-panel {
    background: var(--panel);
    border: 1px solid rgba(85, 55, 27, 0.12);
    border-radius: 24px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.hero-panel {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    padding: 24px 28px;
    margin-bottom: 24px;
}

.eyebrow,
.meta-label {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    color: var(--muted);
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 10px;
    font-size: clamp(2rem, 4vw, 3.4rem);
}

.hero-copy {
    margin-bottom: 0;
    max-width: 720px;
    color: var(--muted);
    line-height: 1.6;
}

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

.primary-btn,
.secondary-btn,
.promotion-btn {
    border: none;
    border-radius: 999px;
    padding: 12px 18px;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.primary-btn {
    color: #fff9f0;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    box-shadow: 0 12px 24px rgba(107, 58, 24, 0.24);
}

.secondary-btn,
.promotion-btn {
    background: #f7efdf;
    color: var(--text);
    border: 1px solid rgba(107, 58, 24, 0.18);
}

.primary-btn:hover,
.secondary-btn:hover,
.promotion-btn:hover {
    transform: translateY(-2px);
}

.game-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: 24px;
    align-items: start;
}

.board-panel {
    padding: 22px;
}

.board-header,
.panel-heading {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
}

.board-header {
    margin-bottom: 18px;
}

.status-pill {
    padding: 8px 14px;
    border-radius: 999px;
    background: #f4e6cf;
    color: var(--accent-dark);
    font-size: 0.95rem;
}

.board-and-ranks {
    display: grid;
    grid-template-columns: 20px minmax(0, 1fr);
    gap: 12px;
    align-items: stretch;
}

.rank-labels,
.file-labels {
    color: var(--muted);
    font-size: 0.95rem;
}

.rank-labels {
    display: grid;
    grid-template-rows: repeat(8, 1fr);
    align-items: center;
    padding: 10px 0;
}

.file-labels {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 0;
    padding: 10px 8px 0 40px;
    text-align: center;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    width: min(100%, 720px);
    aspect-ratio: 1;
    border: 12px solid var(--board-outline);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12), 0 16px 36px rgba(66, 41, 18, 0.18);
}

.square {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    padding: 0;
    cursor: pointer;
    background: transparent;
}

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

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

.square::after {
    content: "";
    position: absolute;
    inset: 0;
    box-shadow: inset 0 0 0 0 transparent;
    transition: box-shadow 0.18s ease, background 0.18s ease;
}

.square.selected::after {
    box-shadow: inset 0 0 0 4px var(--select);
}

.square.legal::after {
    background: radial-gradient(circle, var(--hint) 0 18%, transparent 19%);
}

.square.capture::after {
    box-shadow: inset 0 0 0 4px var(--capture);
}

.square.king-in-check::after {
    background: linear-gradient(135deg, rgba(255,255,255,0.08), transparent), var(--check);
    opacity: 0.72;
}

.square:focus-visible {
    outline: 4px solid #1c6f52;
    outline-offset: -4px;
}

.piece-image {
    width: min(84%, 68px);
    height: auto;
    user-select: none;
    pointer-events: none;
    filter: drop-shadow(0 3px 4px rgba(0, 0, 0, 0.22));
}

.status-text {
    margin: 18px 0 0;
    color: var(--muted);
    line-height: 1.5;
}

.sidebar {
    display: grid;
    gap: 18px;
}

.panel {
    padding: 18px;
}

.captured-strip {
    min-height: 58px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.captured-token {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: var(--panel-strong);
    padding: 4px;
    border: 1px solid rgba(85, 55, 27, 0.12);
}

.moves-panel {
    min-height: 280px;
}

.move-list {
    margin: 14px 0 0;
    padding-left: 22px;
    max-height: 360px;
    overflow: auto;
    color: var(--muted);
}

.move-list li {
    padding: 4px 0;
}

.promotion-modal {
    position: fixed;
    inset: 0;
    background: rgba(36, 24, 15, 0.48);
    display: grid;
    place-items: center;
    padding: 20px;
}

.promotion-modal.hidden {
    display: none;
}

.promotion-card {
    width: min(420px, 100%);
    background: var(--panel-strong);
    border-radius: 22px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.promotion-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.promotion-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px;
}

.promotion-btn img {
    width: 34px;
    height: 34px;
}

@media (max-width: 960px) {
    .game-layout {
        grid-template-columns: 1fr;
    }

    .hero-panel {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-actions {
        justify-content: flex-start;
    }
}

@media (max-width: 640px) {
    .app-shell {
        width: min(100% - 20px, 100%);
        padding-top: 18px;
    }

    .hero-panel,
    .board-panel,
    .panel {
        border-radius: 18px;
    }

    .hero-panel,
    .board-panel {
        padding: 16px;
    }

    .board-and-ranks {
        gap: 8px;
        grid-template-columns: 14px minmax(0, 1fr);
    }

    .file-labels {
        padding-left: 24px;
        font-size: 0.82rem;
    }

    .rank-labels {
        font-size: 0.82rem;
    }

    .board {
        border-width: 8px;
        border-radius: 14px;
    }
}