:root {
    --tutorial-bg: #0c0d0b;
    --tutorial-panel: #17150f;
    --tutorial-panel-2: #121815;
    --tutorial-ink: #f2eee4;
    --tutorial-muted: rgba(242, 238, 228, 0.68);
    --tutorial-gold: #c5a059;
    --tutorial-red: #c0392b;
    --tutorial-green: #4f9d6d;
    --tutorial-line: rgba(197, 160, 89, 0.74);
}

.tutorial-body {
    min-height: 100%;
    overflow-x: hidden;
    background:
        linear-gradient(135deg, rgba(31, 51, 38, 0.36), transparent 42%),
        linear-gradient(225deg, rgba(120, 28, 23, 0.28), transparent 38%),
        var(--tutorial-bg);
    color: var(--tutorial-ink);
}

.tutorial-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 22px 0 48px;
}

.tutorial-header {
    min-height: 60vh;
    display: grid;
    align-content: center;
    gap: 20px;
    border-bottom: 1px solid rgba(197, 160, 89, 0.24);
}

.back-link {
    width: fit-content;
    color: var(--tutorial-gold);
    text-decoration: none;
    border: 1px solid rgba(197, 160, 89, 0.38);
    border-radius: 8px;
    padding: 9px 12px;
    font-weight: 700;
    font-size: 0.9rem;
}

.back-link:hover,
.back-link:focus-visible {
    background: rgba(197, 160, 89, 0.12);
    outline: none;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--tutorial-gold);
    text-transform: uppercase;
    letter-spacing: 0;
    font-size: 0.78rem;
    font-weight: 700;
}

.tutorial-header h1,
.section-copy h2 {
    font-family: "Noto Serif", serif;
    margin: 0;
    line-height: 1.05;
    max-width: 100%;
    overflow-wrap: anywhere;
}

.tutorial-header h1 {
    max-width: 860px;
    font-size: 4rem;
    color: var(--tutorial-ink);
}

.tutorial-intro,
.section-copy p {
    max-width: 760px;
    margin: 0;
    color: var(--tutorial-muted);
    line-height: 1.65;
}

.tutorial-intro {
    font-size: 1.05rem;
}

.tutorial-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 0;
    background: rgba(12, 13, 11, 0.92);
    border-bottom: 1px solid rgba(197, 160, 89, 0.18);
    backdrop-filter: blur(10px);
}

.tutorial-nav a {
    flex: 0 1 auto;
    color: var(--tutorial-ink);
    text-decoration: none;
    border: 1px solid rgba(197, 160, 89, 0.28);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.88rem;
    font-weight: 700;
}

.tutorial-nav a:hover,
.tutorial-nav a:focus-visible {
    color: var(--tutorial-gold);
    border-color: rgba(197, 160, 89, 0.7);
    outline: none;
}

.tutorial-band,
.quick-reference {
    padding: 54px 0;
    border-bottom: 1px solid rgba(197, 160, 89, 0.16);
}

.section-copy {
    margin-bottom: 24px;
}

.section-copy h2 {
    max-width: 800px;
    margin-bottom: 12px;
    font-size: 2rem;
}

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.lesson-card {
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(210px, 0.85fr) minmax(0, 1fr);
    gap: 16px;
    align-items: stretch;
    background: linear-gradient(160deg, rgba(23, 21, 15, 0.96), rgba(18, 24, 21, 0.96));
    border: 1px solid rgba(197, 160, 89, 0.24);
    border-radius: 8px;
    padding: 14px;
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.28);
}

.lesson-card.wide {
    grid-column: 1 / -1;
}

.lesson-copy {
    min-width: 0;
}

.lesson-tag {
    color: var(--tutorial-gold);
    text-transform: uppercase;
    letter-spacing: 0;
    font-size: 0.72rem;
    font-weight: 700;
    margin: 0 0 8px;
}

.lesson-copy h3 {
    margin: 0 0 10px;
    font-family: "Noto Serif", serif;
    font-size: 1.35rem;
    line-height: 1.2;
}

.lesson-copy p {
    margin: 0 0 10px;
    color: var(--tutorial-muted);
    line-height: 1.55;
    font-size: 0.94rem;
}

.lesson-copy strong {
    color: var(--tutorial-ink);
}

.lesson-points {
    margin: 12px 0 0;
    padding-left: 18px;
    color: var(--tutorial-muted);
    line-height: 1.5;
    font-size: 0.9rem;
}

.lesson-points li {
    margin-bottom: 6px;
}

.lesson-board {
    min-width: 0;
}

.board-surface {
    position: relative;
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
    aspect-ratio: 8 / 9;
    padding: 24px;
    border-radius: 8px;
    background:
        linear-gradient(145deg, rgba(47, 32, 15, 0.96), rgba(15, 20, 17, 0.98));
    border: 1px solid rgba(197, 160, 89, 0.34);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.58);
}

.board-grid {
    position: absolute;
    inset: 24px;
}

.grid-line {
    position: absolute;
    background: var(--tutorial-line);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.65);
}

.grid-line.vertical {
    width: 1px;
    top: 0;
    bottom: 0;
    left: calc(var(--col) * 12.5%);
}

.grid-line.horizontal {
    height: 1px;
    left: 0;
    right: 0;
    top: calc(var(--row) * 11.111111%);
}

.river-gap {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(4 * 11.111111%);
    height: 11.111111%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(197, 160, 89, 0.82);
    font-family: "Noto Serif", serif;
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0;
    text-transform: uppercase;
    background: linear-gradient(90deg, transparent, rgba(12, 13, 11, 0.82), transparent);
    pointer-events: none;
}

.palace-line {
    position: absolute;
    height: 1px;
    width: 35.36%;
    background: rgba(197, 160, 89, 0.85);
    transform-origin: left center;
}

.palace-line.down {
    transform: rotate(45deg);
}

.palace-line.up {
    transform: rotate(135deg);
}

.point-marker,
.piece,
.zone-label {
    position: absolute;
    left: calc(var(--col) * 12.5%);
    top: calc(var(--row) * 11.111111%);
    transform: translate(-50%, -50%);
}

.point-marker {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    z-index: 6;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 800;
    color: #080908;
}

.point-marker.move {
    background: var(--tutorial-green);
    border: 2px solid rgba(242, 238, 228, 0.82);
}

.point-marker.blocked,
.point-marker.illegal {
    background: var(--tutorial-red);
    color: #fff;
    border: 2px solid rgba(242, 238, 228, 0.76);
}

.point-marker.screen {
    background: var(--tutorial-gold);
    color: #111;
    border: 2px solid rgba(242, 238, 228, 0.82);
}

.attack-line {
    position: absolute;
    left: calc(var(--from-col) * 12.5%);
    top: calc(var(--from-row) * 11.111111%);
    background: var(--tutorial-gold);
    z-index: 5;
    box-shadow: 0 0 8px rgba(197, 160, 89, 0.62);
}

.attack-line.horizontal {
    width: calc(var(--col-len) * 12.5%);
    height: 3px;
    transform: translateY(-50%);
}

.attack-line.vertical {
    width: 3px;
    height: calc(var(--row-len) * 11.111111%);
    transform: translateX(-50%);
}

.piece {
    width: 42px;
    height: 42px;
    z-index: 8;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: #141414;
    border: 1px solid rgba(242, 238, 228, 0.3);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.55);
}

.piece img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 50%;
    z-index: 1;
}

.piece span {
    position: absolute;
    font-family: "Noto Serif", serif;
    font-weight: 700;
    color: var(--tutorial-gold);
    z-index: 0;
}

.piece.red span {
    color: #ffb1a9;
}

.zone {
    position: absolute;
    left: calc(var(--col) * 12.5%);
    top: calc(var(--row) * 11.111111%);
    width: calc(var(--w) * 12.5%);
    height: calc(var(--h) * 11.111111%);
    border: 2px solid rgba(79, 157, 109, 0.8);
    background: rgba(79, 157, 109, 0.1);
    transform: translate(-50%, -50%);
    border-radius: 6px;
    z-index: 2;
}

.zone-label {
    z-index: 7;
    padding: 3px 6px;
    border-radius: 5px;
    background: rgba(8, 9, 8, 0.82);
    border: 1px solid rgba(197, 160, 89, 0.42);
    color: var(--tutorial-gold);
    font-size: 0.67rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0;
    white-space: nowrap;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    margin-top: 10px;
    color: var(--tutorial-muted);
    font-size: 0.82rem;
}

.legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.legend i {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    display: inline-block;
}

.legend .legal i { background: var(--tutorial-green); }
.legend .blocked i { background: var(--tutorial-red); }
.legend .screen i { background: var(--tutorial-gold); }

.reference-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.reference-grid article {
    background: rgba(18, 24, 21, 0.86);
    border: 1px solid rgba(197, 160, 89, 0.22);
    border-radius: 8px;
    padding: 14px;
}

.reference-grid h3 {
    margin: 0 0 8px;
    font-family: "Noto Serif", serif;
    color: var(--tutorial-gold);
    font-size: 1rem;
}

.reference-grid p {
    margin: 0;
    color: var(--tutorial-muted);
    line-height: 1.5;
    font-size: 0.9rem;
}

@media (max-width: 980px) {
    .lesson-grid,
    .reference-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .tutorial-shell {
        width: calc(100% - 20px);
        padding-top: 14px;
    }

    .tutorial-header {
        min-height: 58vh;
    }

    .tutorial-header h1 {
        font-size: 2.05rem;
    }

    .section-copy h2 {
        font-size: 1.55rem;
    }

    .lesson-card,
    .lesson-card.wide {
        grid-template-columns: 1fr;
    }

    .board-surface {
        max-width: min(330px, 100%);
        padding: 20px;
    }

    .board-grid {
        inset: 20px;
    }

    .piece {
        width: 34px;
        height: 34px;
    }

    .point-marker {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 420px) {
    .tutorial-header h1 {
        font-size: 1.8rem;
    }

    .tutorial-nav a {
        flex: 1 1 96px;
        text-align: center;
    }
}