:root {
    --bg-primary: #f4f5f2;
    --text-primary: #18201d;
    --muted: #63706a;
    --card-bg: #ffffff;
    --soft-bg: #edf0eb;
    --border-color: #dce2dc;
    --navy: #17263c;
    --navy-soft: #243958;
    --mint: #2b9d78;
    --mint-dark: #167358;
    --coral: #e0644f;
    --purple: #8c62d8;
    --yellow: #efb640;
    --shadow: 0 14px 40px rgba(23, 38, 60, 0.09);
}

[data-theme="dark"] {
    --bg-primary: #0c1110;
    --text-primary: #edf4f0;
    --muted: #a3b0aa;
    --card-bg: #151c1a;
    --soft-bg: #1c2522;
    --border-color: #2e3b36;
    --navy: #cbdcf8;
    --navy-soft: #a9bee0;
    --mint: #4fc79d;
    --mint-dark: #79dbb8;
    --shadow: 0 16px 45px rgba(0, 0, 0, 0.25);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at 88% 3%, rgba(43, 157, 120, 0.08), transparent 27rem),
        var(--bg-primary);
    color: var(--text-primary);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    min-height: 100vh;
}

button, select {
    font: inherit;
}

button {
    cursor: pointer;
}

button:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(43, 157, 120, 0.45);
    outline-offset: 3px;
}

.pattern-app {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 18px 0 64px;
}

.pattern-header,
.section-heading,
.results-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.pattern-header {
    border-bottom: 1px solid var(--border-color);
    min-height: 48px;
}

.pattern-header h1 {
    flex: 0 0 auto;
    font-size: clamp(1.45rem, 3vw, 2rem);
    line-height: 1;
    letter-spacing: -0.04em;
    margin: 0;
    color: var(--navy);
}

.eyebrow {
    color: var(--mint-dark);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin: 0;
}

.motif-pill {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    font-weight: 750;
    white-space: nowrap;
}

.mode-tabs {
    align-self: stretch;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: thin;
}

.mode-tab {
    border: 0;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    color: var(--muted);
    font-weight: 750;
    min-height: 46px;
    padding: 8px 11px;
    white-space: nowrap;
}

.mode-tab:hover {
    color: var(--text-primary);
}

.mode-tab.is-active {
    background: transparent;
    border-bottom-color: var(--mint);
    color: var(--navy);
}

[data-theme="dark"] .mode-tab.is-active {
    background: transparent;
    color: var(--navy);
}

.mode-panel {
    padding-top: 24px;
}

#panel-drills {
    padding-top: 12px;
}

.section-heading {
    margin-bottom: 22px;
}

.section-heading h2,
.results-heading h3 {
    color: var(--navy);
    font-size: clamp(1.55rem, 3vw, 2.35rem);
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin: 5px 0 0;
    max-width: 760px;
}

.quick-actions,
.trainer-actions,
.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.button {
    border: 1px solid transparent;
    border-radius: 11px;
    font-weight: 800;
    min-height: 43px;
    padding: 10px 15px;
    transition: transform 150ms ease, background-color 150ms ease, border-color 150ms ease;
}

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

.button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
    transform: none;
}

.button-primary {
    background: var(--navy);
    color: var(--card-bg);
}

.button-accent {
    background: var(--mint);
    color: #fff;
}

.button-secondary {
    background: var(--card-bg);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.button-ghost {
    background: transparent;
    border-color: var(--border-color);
    color: var(--muted);
}

.button-danger {
    background: var(--coral);
    border-color: var(--coral);
    color: #fff;
}

.button-overlay {
    background: rgba(43, 157, 120, 0.12);
    border-color: rgba(43, 157, 120, 0.3);
    color: var(--mint-dark);
}

.button-overlay[aria-pressed="true"] {
    background: var(--mint);
    color: #fff;
}

.button-large {
    min-height: 52px;
    padding-inline: 22px;
}

.drill-controls {
    align-items: center;
    display: grid;
    gap: 6px 12px;
    grid-template-columns: auto minmax(190px, 270px) minmax(0, 1fr);
    margin-bottom: 10px;
}

.drill-controls label {
    color: var(--text-primary);
    font-size: 0.76rem;
    font-weight: 800;
}

.drill-controls select {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 9px;
    color: var(--text-primary);
    min-height: 38px;
    padding: 7px 34px 7px 10px;
    width: 100%;
}

.drill-controls span {
    color: var(--muted);
    font-size: 0.75rem;
    line-height: 1.35;
}

.trainer-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: clamp(20px, 4vw, 46px);
    align-items: start;
}

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

.mobile-board-actions {
    display: none;
}

.board-shell,
.trainer-card,
.blitz-setup,
.results-card,
.encyclopedia-detail,
.progress-card,
.blind-spot-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.board-shell {
    padding: 13px;
}

.board-meta {
    align-items: center;
    color: var(--muted);
    display: flex;
    font-size: 0.82rem;
    font-weight: 750;
    justify-content: space-between;
    min-height: 27px;
    padding: 0 3px 10px;
}

.blitz-shell .board-meta strong {
    color: var(--coral);
    font-size: 1.1rem;
    font-variant-numeric: tabular-nums;
}

.pattern-board {
    aspect-ratio: 1;
    margin: 0 auto;
    max-width: min(620px, calc(100dvh - 250px));
    width: 100%;
}

.pattern-board svg {
    display: block;
}

.trainer-card {
    padding: clamp(20px, 3vw, 30px);
    position: sticky;
    top: 78px;
}

.trainer-kicker {
    align-items: center;
    color: var(--muted);
    display: flex;
    font-size: 0.77rem;
    justify-content: space-between;
    gap: 10px;
}

.motif-pill {
    background: rgba(43, 157, 120, 0.12);
    color: var(--mint-dark);
    font-size: 0.73rem;
    padding: 6px 9px;
}

.trainer-card h3 {
    color: var(--navy);
    font-size: clamp(1.45rem, 3vw, 2rem);
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin: 20px 0 9px;
}

.trainer-instruction {
    color: var(--muted);
    font-size: 0.91rem;
    line-height: 1.55;
    margin: 0;
}

.trainer-status {
    background: var(--soft-bg);
    border-radius: 12px;
    font-weight: 720;
    line-height: 1.45;
    margin: 20px 0;
    min-height: 58px;
    padding: 13px 15px;
}

.trainer-status.is-success {
    background: rgba(43, 157, 120, 0.14);
    color: var(--mint-dark);
}

.trainer-status.is-error {
    background: rgba(224, 100, 79, 0.13);
    color: var(--coral);
}

.session-mini-stats,
.results-grid,
.progress-overview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.session-mini-stats {
    margin-bottom: 20px;
}

.session-mini-stats div,
.result-stat,
.overview-stat {
    background: var(--soft-bg);
    border-radius: 11px;
    padding: 11px 8px;
    text-align: center;
}

.session-mini-stats strong,
.session-mini-stats span,
.result-stat strong,
.result-stat span,
.overview-stat strong,
.overview-stat span {
    display: block;
}

.session-mini-stats strong,
.result-stat strong,
.overview-stat strong {
    color: var(--navy);
    font-size: 1.18rem;
    font-variant-numeric: tabular-nums;
}

.session-mini-stats span,
.result-stat span,
.overview-stat span {
    color: var(--muted);
    font-size: 0.68rem;
    margin-top: 3px;
}

.trainer-actions .button {
    flex: 1 1 130px;
}

.solution-card,
.cue-card,
.mistake-card {
    border-left: 4px solid var(--mint);
    border-radius: 8px;
    margin-top: 18px;
    padding: 12px 14px;
}

.solution-card {
    background: rgba(43, 157, 120, 0.1);
}

.solution-card p,
.cue-card p,
.mistake-card p {
    color: var(--muted);
    line-height: 1.5;
    margin: 5px 0 0;
}

.overlay-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    color: var(--muted);
    font-size: 0.76rem;
    padding: 12px 4px 0;
}

.overlay-legend span {
    align-items: center;
    display: inline-flex;
    gap: 7px;
}

.legend-dot {
    border-radius: 50%;
    display: inline-block;
    height: 10px;
    width: 10px;
}

.legend-dot.attacker { background: #22a875; }
.legend-dot.target { background: #e75858; }
.legend-dot.defender { background: #8b5bd6; }

.blitz-setup {
    align-items: end;
    display: grid;
    grid-template-columns: minmax(240px, 0.8fr) 1.2fr auto;
    gap: 24px;
    padding: 28px;
}

.blitz-setup label {
    display: block;
    font-size: 0.78rem;
    font-weight: 800;
    margin-bottom: 7px;
}

.blitz-setup select {
    background: var(--soft-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    min-height: 48px;
    padding: 8px 12px;
    width: 100%;
}

.blitz-setup p {
    color: var(--muted);
    line-height: 1.5;
    margin: 0;
}

.results-card {
    padding: clamp(22px, 4vw, 38px);
}

.results-grid,
.progress-overview {
    grid-template-columns: repeat(5, 1fr);
    margin-top: 24px;
}

.per-motif-results {
    display: grid;
    gap: 9px;
    grid-template-columns: repeat(4, 1fr);
    margin-top: 22px;
}

.motif-result {
    border: 1px solid var(--border-color);
    border-radius: 11px;
    color: var(--muted);
    font-size: 0.8rem;
    padding: 10px 12px;
}

.motif-result strong {
    color: var(--text-primary);
}

.review-section {
    border-top: 1px solid var(--border-color);
    margin-top: 28px;
    padding-top: 25px;
}

.review-section h4 {
    color: var(--navy);
    font-size: 1.2rem;
    margin: 0 0 4px;
}

.review-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.review-detail {
    align-items: start;
    display: grid;
    gap: 24px;
    grid-template-columns: minmax(240px, 420px) 1fr;
    margin-top: 22px;
}

.review-board {
    width: min(100%, 420px);
}

.encyclopedia-layout {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 20px;
}

.encyclopedia-index {
    display: grid;
    gap: 8px;
}

.encyclopedia-button {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 11px;
    color: var(--text-primary);
    font-weight: 750;
    padding: 13px 14px;
    text-align: left;
}

.encyclopedia-button:hover,
.encyclopedia-button.is-active {
    border-color: var(--mint);
    color: var(--mint-dark);
}

.encyclopedia-detail {
    display: grid;
    grid-template-columns: minmax(280px, 0.9fr) 1.1fr;
    gap: clamp(22px, 4vw, 42px);
    padding: clamp(20px, 4vw, 38px);
}

.encyclopedia-diagram {
    margin: 0;
    min-width: 0;
}

.diagram-heading {
    align-items: center;
    display: flex;
    font-size: 0.78rem;
    justify-content: space-between;
    margin-bottom: 9px;
}

.diagram-heading strong {
    background: var(--navy);
    border-radius: 999px;
    color: var(--card-bg);
    padding: 6px 10px;
}

.diagram-heading span {
    color: var(--muted);
    font-weight: 700;
}

.encyclopedia-board {
    max-width: 480px;
}

.diagram-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 7px 14px;
    margin: 12px 0 0;
}

.diagram-legend span {
    align-items: center;
    color: var(--muted);
    display: inline-flex;
    font-size: 0.7rem;
    font-weight: 700;
    gap: 6px;
}

.legend-arrow {
    border-radius: 999px;
    display: inline-block;
    height: 4px;
    position: relative;
    width: 22px;
}

.legend-arrow::after {
    border-bottom: 5px solid transparent;
    border-left: 7px solid currentColor;
    border-top: 5px solid transparent;
    content: "";
    position: absolute;
    right: -2px;
    top: -3px;
}

.legend-arrow.move {
    background: #1c9b70;
    color: #1c9b70;
}

.legend-arrow.attack {
    background: #df5454;
    color: #df5454;
}

.legend-ring {
    border: 3px solid;
    border-radius: 50%;
    display: inline-block;
    height: 16px;
    width: 16px;
}

.legend-ring.defender {
    background: rgba(139, 91, 214, 0.2);
    border-color: #7945c6;
}

.move-breakdown {
    background: var(--soft-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    margin-top: 14px;
    padding: 15px;
}

.move-heading {
    align-items: baseline;
    display: flex;
    gap: 10px;
    justify-content: space-between;
}

.move-heading span,
.example-line > span {
    color: var(--muted);
    font-size: 0.67rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.move-heading strong {
    color: var(--mint-dark);
    font-size: 1.25rem;
}

.move-breakdown > p {
    color: var(--text-primary);
    font-size: 0.82rem;
    line-height: 1.5;
    margin: 8px 0 0;
}

.example-line {
    border-top: 1px solid var(--border-color);
    display: grid;
    gap: 5px;
    margin-top: 12px;
    padding-top: 11px;
}

.example-line strong {
    color: var(--navy);
    font-size: 0.82rem;
    line-height: 1.45;
}

.move-breakdown .follow-up {
    color: var(--muted);
}

.move-breakdown .follow-up strong {
    color: var(--text-primary);
}

.encyclopedia-copy h3 {
    color: var(--navy);
    font-size: clamp(1.45rem, 3vw, 2.15rem);
    letter-spacing: -0.035em;
    line-height: 1.12;
    margin: 17px 0 22px;
}

.encyclopedia-copy h4 {
    font-size: 0.83rem;
    letter-spacing: 0.08em;
    margin: 20px 0 8px;
    text-transform: uppercase;
}

.encyclopedia-copy ul {
    color: var(--muted);
    line-height: 1.6;
    margin: 0;
    padding-left: 20px;
}

.cue-card {
    background: rgba(43, 157, 120, 0.1);
}

.mistake-card {
    background: rgba(224, 100, 79, 0.08);
    border-left-color: var(--coral);
    margin-bottom: 20px;
}

.filter-group {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 4px;
}

.progress-controls {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.filter-button {
    background: transparent;
    border: 0;
    border-radius: 8px;
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 800;
    padding: 8px 12px;
}

.filter-button.is-active {
    background: var(--navy);
    color: var(--card-bg);
}

.progress-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(2, 1fr);
    margin-top: 18px;
}

.progress-card {
    padding: 20px;
}

.progress-card-header,
.progress-card-row {
    align-items: center;
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.progress-card-header h3 {
    font-size: 1.05rem;
    margin: 0;
}

.proficiency-badge {
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 850;
    padding: 6px 8px;
}

.proficiency-badge.new { background: var(--soft-bg); color: var(--muted); }
.proficiency-badge.needs-practice { background: rgba(224, 100, 79, 0.14); color: var(--coral); }
.proficiency-badge.building { background: rgba(239, 182, 64, 0.17); color: #9a6900; }
.proficiency-badge.strong { background: rgba(43, 157, 120, 0.14); color: var(--mint-dark); }
.proficiency-badge.mastered { background: rgba(140, 98, 216, 0.15); color: var(--purple); }

.progress-bar {
    background: var(--soft-bg);
    border-radius: 999px;
    height: 7px;
    margin: 17px 0;
    overflow: hidden;
}

.progress-bar span {
    background: linear-gradient(90deg, var(--mint), #62c8a9);
    display: block;
    height: 100%;
}

.progress-card-row {
    color: var(--muted);
    font-size: 0.76rem;
}

.progress-card-row strong {
    color: var(--text-primary);
}

.blind-spot-card {
    margin-top: 18px;
    padding: 23px;
}

.blind-spot-card h3 {
    color: var(--navy);
    margin: 0 0 7px;
}

.blind-spot-card p {
    color: var(--muted);
    line-height: 1.5;
    margin: 0 0 15px;
}

.reset-feedback {
    background: rgba(43, 157, 120, 0.12);
    border: 1px solid rgba(43, 157, 120, 0.28);
    border-radius: 10px;
    color: var(--mint-dark);
    font-size: 0.82rem;
    font-weight: 750;
    margin: 0 0 14px;
    padding: 10px 12px;
}

.confirm-dialog {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
    color: var(--text-primary);
    max-width: min(480px, calc(100% - 28px));
    padding: 24px;
}

.confirm-dialog::backdrop {
    background: rgba(8, 13, 12, 0.7);
    backdrop-filter: blur(3px);
}

.confirm-dialog-content {
    align-items: flex-start;
    display: flex;
    gap: 14px;
}

.confirm-dialog-icon {
    align-items: center;
    background: rgba(224, 100, 79, 0.14);
    border-radius: 50%;
    color: var(--coral);
    display: inline-flex;
    flex: 0 0 38px;
    font-size: 1.2rem;
    font-weight: 900;
    height: 38px;
    justify-content: center;
}

.confirm-dialog h2 {
    color: var(--navy);
    font-size: 1.35rem;
    margin: 2px 0 8px;
}

.confirm-dialog p {
    color: var(--muted);
    line-height: 1.55;
    margin: 0;
}

.confirm-dialog-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 24px;
}

.alert {
    background: rgba(239, 182, 64, 0.14);
    border: 1px solid rgba(239, 182, 64, 0.35);
    border-radius: 11px;
    margin: 0 0 18px;
    padding: 12px 14px;
}

.alert-error {
    background: rgba(224, 100, 79, 0.13);
    border-color: rgba(224, 100, 79, 0.35);
    color: var(--coral);
}

.pattern-footer {
    border-top: 1px solid var(--border-color);
    color: var(--muted);
    font-size: 0.76rem;
    line-height: 1.5;
    margin-top: 44px;
    padding-top: 18px;
    text-align: center;
}

.pattern-footer a {
    color: var(--mint-dark);
}

svg.cm-chessboard .markers .marker.marker-pattern-attacker {
    fill: rgba(34, 168, 117, 0.22);
    stroke: #129264;
    stroke-width: 3px;
}

svg.cm-chessboard .markers .marker.marker-pattern-target {
    fill: rgba(231, 88, 88, 0.2);
    stroke: #d13d3d;
    stroke-width: 3px;
}

svg.cm-chessboard .markers .marker.marker-pattern-defender {
    fill: rgba(139, 91, 214, 0.2);
    stroke: #7945c6;
    stroke-width: 3px;
}

svg.cm-chessboard .arrow-pattern-move .arrow-head,
svg.cm-chessboard .arrow-pattern-move .arrow-line {
    fill: #1c9b70;
    stroke: #1c9b70;
    opacity: 0.9;
}

svg.cm-chessboard .arrow-pattern-attack .arrow-head,
svg.cm-chessboard .arrow-pattern-attack .arrow-line {
    fill: #df5454;
    stroke: #df5454;
    opacity: 0.7;
}

@media (max-width: 900px) {
    .trainer-layout,
    .encyclopedia-detail {
        grid-template-columns: 1fr;
    }

    .trainer-card {
        position: static;
    }

    .blitz-setup {
        align-items: stretch;
        grid-template-columns: 1fr;
    }

    .encyclopedia-layout {
        grid-template-columns: 1fr;
    }

    .encyclopedia-index {
        display: flex;
        overflow-x: auto;
        padding-bottom: 8px;
    }

    .encyclopedia-button {
        flex: 0 0 auto;
    }
}

@media (max-width: 680px) {
    .pattern-app {
        width: min(100% - 20px, 1180px);
        padding-top: 10px;
    }

    .section-heading,
    .results-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .pattern-header {
        align-items: stretch;
        display: block;
        min-height: 0;
    }

    .pattern-header h1 {
        font-size: 1.45rem;
        padding: 5px 2px 8px;
    }

    .mode-tabs {
        margin: 0 -2px;
    }

    .mode-tab {
        flex: 0 0 auto;
        font-size: 0.72rem;
        min-height: 38px;
        padding: 6px 8px;
    }

    .mode-panel {
        padding-top: 18px;
    }

    #panel-drills {
        padding-top: 8px;
    }

    .drill-controls {
        grid-template-columns: auto minmax(0, 1fr);
        margin-bottom: 8px;
    }

    .drill-controls span {
        grid-column: 1 / -1;
    }

    .progress-controls {
        justify-content: flex-start;
        width: 100%;
    }

    .confirm-dialog {
        padding: 20px;
    }

    .confirm-dialog-actions {
        flex-direction: column;
    }

    .confirm-dialog-actions .button {
        width: 100%;
    }

    .trainer-layout {
        gap: 14px;
    }

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

    .pattern-board {
        max-width: 100%;
    }

    .mobile-board-actions {
        display: flex;
        gap: 9px;
        margin-top: 10px;
    }

    .mobile-board-actions .button {
        flex: 1 1 0;
        width: 100%;
    }

    .desktop-trainer-action {
        display: none;
    }

    .trainer-card {
        border-radius: 16px;
        padding: 18px;
    }

    .results-grid,
    .progress-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .per-motif-results,
    .progress-grid {
        grid-template-columns: 1fr;
    }

    .review-detail {
        grid-template-columns: 1fr;
    }

    .encyclopedia-detail {
        padding: 14px;
    }

    .diagram-heading {
        margin-top: 2px;
    }

    .filter-group {
        width: 100%;
    }

    .filter-button {
        flex: 1;
    }
}

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