/* Pages: responsive layout, modals, product polish, and home sections
   Generated from the original stylesheet and kept in cascade order. */

/* ====================
   ??????(RWD)
   ==================== */

@media (max-width: 768px) {
    .content-container {
        flex-direction: column;
        gap: 40px;
        padding: 0 20px;
        margin: 30px auto;
    }

    .navbar {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px 20px;
    }

    .nav-links a {
        display: inline-block;
        padding: 8px 4px;
    }

    h1 {
        font-size: 36px;
    }

    .track-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .track-link {
        margin-top: 2px;
        padding: 9px 16px;
    }

    .track-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 2px;
    }


    .track-actions .track-link {
        text-align: center;
        box-sizing: border-box;
    }

    .footer .social-links {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 12px 20px;
    }

    .footer .social-links a {
        margin: 0;
    }

    .tracks-page {
        margin: 30px auto;
        padding: 0 20px;
    }

    .key-button-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    }

    .key-finder-form {
        grid-template-columns: 1fr;
        display: grid;
    }

    .key-finder-upload {
        grid-template-columns: 1fr;
    }

    .key-finder-upload .primary-button {
        width: 100%;
        box-sizing: border-box;
    }

    .key-finder-final {
        font-size: 26px;
    }

    .key-button {
        padding: 10px 8px;
    }

    .cover-photo {
        max-height: 70vh;
        object-fit: contain;
    }

    #backToTopBtn {
        right: 18px;
        bottom: 22px;
        width: 42px;
        height: 42px;
        font-size: 19px;
    }

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


}


@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .left-column,
    .right-column {
        animation: none;
        opacity: 1;
    }

    .audio-player-card,
    .track-card,
    .primary-button,
    .secondary-button,
    .track-link,
    #backToTopBtn {
        transition: none;
    }

    .audio-player-card:hover,
    .track-card:hover,
    .primary-button:hover,
    .secondary-button:hover,
    .track-link:hover,
    #backToTopBtn:hover {
        transform: none;
    }
}

/* ====================
   敶閬? (Modal) 閮剛?
   ==================== */
.modal-overlay {
    display: none; /* ?身?梯? */
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.8); /* ?€?暺? */
    z-index: 1000; /* 蝣箔?摰?€銝惜 */
    justify-content: center;
    align-items: center;
    /* ?啣?嚗??€?暺?撟單?瘛∪ */
    animation: fadeInBg 0.4s ease forwards;
}

.modal-content {
    background-color: #1a1a1a;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    border: 1px solid #c4a484;
    /* ?啣?嚗?敶閬??祇?憟蝯脫?擃??楚?亙???*/
    animation: fadeInPremium 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

/* ?啣?嚗?蝯西??舐?蝪∪瘛∪? */
@keyframes fadeInBg {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.modal-content label {
    display: block;
    margin-top: 15px;
    color: #e0e0e0;
    font-size: 14px;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    background-color: #2a2a2a;
    border: 1px solid #444;
    color: white;
    border-radius: 5px;
    box-sizing: border-box; /* Keep padding inside modal width. */
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

#codeOutput {
    width: 100%;
    height: 150px;
    margin-top: 20px;
    background-color: #000;
    color: var(--gold);
    font-family: monospace;
    padding: 10px;
    box-sizing: border-box;
}

/* ====================
   Visual polish pass
   ==================== */
body {
    background: linear-gradient(135deg, #101010 0%, #15120f 52%, #101817 100%);
    color: var(--text);
}

h1 {
    font-size: clamp(38px, 5vw, 56px);
    line-height: 1.05;
}

.navbar {
    background-color: rgba(20, 20, 20, 0.84);
    border-bottom: 1px solid rgba(196, 164, 132, 0.16);
}

.primary-button,
.secondary-button,
.track-link,
.key-button,
.select-key-button {
    cursor: pointer;
}

.section-title,
.signature-slogan {
    letter-spacing: 0;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: -8px 0 24px;
}

.hero-badges span,
.track-meta span {
    border-radius: 999px;
    font-size: 13px;
    font-weight: bold;
    padding: 6px 10px;
}

.hero-badges span {
    color: var(--teal);
    background-color: rgba(127, 183, 173, 0.1);
    border: 1px solid rgba(127, 183, 173, 0.28);
}

.page-heading-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 26px;
}

.tracks-library-page {
    position: relative;
    max-width: 1120px;
    margin-top: 82px;
}

.tracks-library-page .page-heading-row {
    display: grid;
    justify-content: start;
    gap: 0;
    max-width: 920px;
    margin-bottom: 54px;
}

.tracks-library-page .page-heading-row > div {
    max-width: 760px;
}

.tracks-library-page h1 {
    margin: 0 0 14px;
    font-size: 68px;
    line-height: 1;
}

.tracks-library-page .hero-tagline {
    margin-top: 0;
    margin-bottom: 28px;
    font-size: 22px;
}

.track-card-main {
    min-width: 0;
}

.track-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 10px;
}

.track-meta span {
    color: var(--gold-light);
    background-color: rgba(196, 164, 132, 0.11);
    border: 1px solid rgba(196, 164, 132, 0.22);
}

.track-meta span:nth-child(2n) {
    color: var(--teal);
    background-color: rgba(127, 183, 173, 0.1);
    border-color: rgba(127, 183, 173, 0.24);
}

.track-meta span:nth-child(3n) {
    color: #e0b7ba;
    background-color: rgba(167, 111, 115, 0.12);
    border-color: rgba(167, 111, 115, 0.28);
}

.track-card,
.key-result,
.key-finder-panel,
.audio-player-card,
.progression-card,
.note-card,
.modal-content {
    border-radius: var(--radius);
}

.track-card,
.key-result,
.key-finder-panel {
    background-color: rgba(27, 27, 27, 0.92);
    border-color: rgba(196, 164, 132, 0.16);
}

.track-card {
    border-left-color: var(--gold);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
}

.track-card:hover {
    transform: translateY(-2px);
    border-color: rgba(196, 164, 132, 0.55);
}

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

.key-finder-panel {
    border-left-color: var(--teal);
}

.key-finder-copy,
.tool-section-heading p {
    color: var(--muted);
    line-height: 1.7;
}

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

.tool-section-heading .section-title {
    margin-bottom: 6px;
}

.key-finder-candidates li {
    background-color: rgba(44, 43, 41, 0.9);
    border-color: rgba(196, 164, 132, 0.16);
}

.cover-photo,
iframe {
    border-radius: 12px;
}

.cover-photo {
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.46);
}

iframe {
    box-shadow: 0 18px 38px rgba(0, 0, 0, 0.38);
}

#backToTopBtn {
    display: none;
    place-items: center;
    line-height: 1;
    text-align: center;
}

@media (max-width: 768px) {
    .page-heading-row {
        display: block;
    }

    .hero-badges {
        margin-top: -4px;
    }

    .track-actions {
        justify-content: stretch;
    }
}

/* ====================
   Product polish additions
   ==================== */
[hidden] {
    display: none !important;
}

.nav-links a.active {
    position: relative;
}

.nav-links a.active::after,
.nav-dropdown summary.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -8px;
    height: 2px;
    background: linear-gradient(90deg, var(--gold), var(--teal));
    border-radius: 999px;
}

.start-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 24px;
}

.start-grid .start-card:last-child:nth-child(odd) {
    grid-column: 1 / -1;
}

.key-finder-page {
    max-width: 920px;
}

.key-finder-page .key-finder-panel {
    margin-top: 34px;
}

.start-card {
    display: grid;
    gap: 7px;
    padding: 16px;
    color: var(--text);
    text-decoration: none;
    background: rgba(27, 27, 27, 0.9);
    border: 1px solid rgba(196, 164, 132, 0.18);
    border-radius: var(--radius);
    transition: transform 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}

.start-card:hover {
    transform: translateY(-2px);
    border-color: rgba(127, 183, 173, 0.45);
    background: rgba(32, 35, 34, 0.94);
}

.start-kicker {
    color: var(--teal);
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.start-card strong {
    color: var(--gold-light);
    font-size: 16px;
}

.start-card span:last-child {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.5;
}

.track-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    gap: 17px 18px;
    align-items: end;
    margin: 24px 0 14px;
    padding: 24px;
    background:
        linear-gradient(90deg, rgba(127, 183, 173, 0.035), transparent 28%),
        rgba(19, 19, 19, 0.38);
    border: 1px solid rgba(196, 164, 132, 0.16);
    border-radius: var(--radius);
}

.track-filter-actions {
    display: flex;
    align-items: center;
    align-self: end;
    grid-column: 1 / -1;
    gap: 10px;
    min-height: 42px;
}

.favorites-filter {
    display: flex !important;
    flex-direction: row !important;
    align-items: center;
    gap: 9px !important;
    width: max-content;
    min-height: 34px;
    padding: 3px 11px 3px 7px;
    color: var(--text) !important;
    background: rgba(30, 30, 30, 0.72);
    border: 1px solid rgba(196, 164, 132, 0.18);
    border-radius: 999px;
    white-space: nowrap;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.favorites-filter input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.favorites-toggle-indicator {
    position: relative;
    width: 30px;
    height: 18px;
    flex: 0 0 auto;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.favorites-toggle-indicator::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 10px;
    height: 10px;
    background: var(--muted);
    border-radius: 50%;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.favorites-filter:has(input:checked) {
    color: var(--gold-light) !important;
    background: rgba(127, 183, 173, 0.08);
    border-color: rgba(127, 183, 173, 0.4);
}

.favorites-filter input:checked + .favorites-toggle-indicator {
    background: rgba(127, 183, 173, 0.32);
    border-color: var(--teal);
}

.favorites-filter input:checked + .favorites-toggle-indicator::after {
    background: var(--teal);
    transform: translateX(12px);
}

.favorites-filter:has(input:focus-visible) {
    outline: 3px solid rgba(127, 183, 173, 0.24);
    outline-offset: 2px;
}

.track-reset-button {
    min-height: 34px;
    padding: 6px 11px;
    color: var(--muted);
    background: transparent;
    border: 0;
    border-radius: 5px;
    font-family: inherit;
    font-size: 13px;
    font-weight: bold;
    text-decoration: underline;
    text-decoration-color: rgba(196, 164, 132, 0.42);
    text-underline-offset: 4px;
    cursor: pointer;
}

.track-reset-button:hover {
    color: var(--gold-light);
}

.track-reset-button:focus-visible {
    color: var(--gold-light);
    outline: 3px solid rgba(127, 183, 173, 0.24);
    outline-offset: 2px;
}

.track-native-filter {
    display: none !important;
}

.track-native-filter-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
}

.track-pill-filter {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    grid-column: 1 / -1;
    gap: 8px;
    min-height: 48px;
    padding: 10px 12px;
    background: var(--soft-background);
    border: 1px solid var(--border-soft);
    border-radius: 7px;
}

.track-pill-filter > span {
    margin-right: 5px;
    color: var(--text-body);
    font-size: 13px;
    font-weight: 800;
}

.track-pill-options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.track-pill-button {
    min-height: 34px;
    padding: 6px 12px;
    color: var(--secondary-button-text);
    background: var(--secondary-button-background);
    border: 1px solid var(--secondary-button-border);
    border-radius: 999px;
    font: inherit;
    font-size: 12px;
    font-weight: 800;
    line-height: 1.2;
    cursor: pointer;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.track-pill-button:hover {
    color: var(--secondary-hover-text);
    background: var(--secondary-hover-background);
    border-color: var(--hover-border);
    transform: translateY(-1px);
}

.track-pill-button.is-selected {
    color: var(--chord-accent-text);
    background: var(--chord-accent);
    border-color: var(--chord-accent);
}

.track-pill-button:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 2px;
}

.track-toolbar {
    position: relative;
}

.track-toolbar-group {
    display: flex;
    align-items: center;
    gap: 13px;
}

.track-toolbar-label {
    color: var(--text-body);
    font-size: 13px;
    font-weight: 850;
}

.track-dropdown-filter {
    position: relative;
    display: block;
    min-height: auto;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
}

.track-dropdown-filter::after {
    content: "";
    position: absolute;
    top: 100%;
    right: -10px;
    left: -10px;
    height: 14px;
}

.track-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 6px 2px;
    color: var(--text);
    background: transparent;
    border: 0;
    border-radius: 5px;
    font: inherit;
    font-size: 13px;
    font-weight: 850;
    line-height: 1.2;
    cursor: pointer;
}

.track-dropdown-toggle::after {
    content: "";
    width: 7px;
    height: 7px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
    transition: transform 0.2s ease;
}

.track-dropdown-toggle span {
    color: var(--teal);
}

.track-dropdown-filter:hover .track-dropdown-toggle::after,
.track-dropdown-filter:focus-within .track-dropdown-toggle::after,
.track-dropdown-filter.is-open .track-dropdown-toggle::after {
    transform: translateY(2px) rotate(225deg);
}

.track-dropdown-filter .track-pill-options {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    z-index: 35;
    display: grid;
    min-width: 190px;
    max-height: min(360px, 64vh);
    overflow: auto;
    gap: 2px;
    padding: 9px;
    background: var(--panel-background);
    border: 1px solid var(--border-soft);
    border-radius: 5px;
    box-shadow: 0 18px 36px var(--shadow-color);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.track-toolbar-sort .track-pill-options {
    right: 0;
    left: auto;
}

.track-dropdown-filter:hover .track-pill-options,
.track-dropdown-filter:focus-within .track-pill-options,
.track-dropdown-filter.is-open .track-pill-options {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.track-dropdown-filter .track-pill-button {
    justify-content: flex-start;
    width: 100%;
    min-height: 36px;
    padding: 8px 10px;
    color: var(--text);
    background: transparent;
    border: 0;
    border-radius: 4px;
    text-align: left;
}

.track-dropdown-filter .track-pill-button:hover,
.track-dropdown-filter .track-pill-button.is-selected {
    color: var(--chord-accent-text);
    background: var(--chord-accent);
}

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

.track-card-title-row h2,
.track-card-title-row h3 {
    margin: 0;
}

.favorite-track-button {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex: 0 0 auto;
    padding: 0;
    color: var(--muted);
    background: rgba(18, 18, 18, 0.55);
    border: 1px solid rgba(196, 164, 132, 0.2);
    border-radius: 50%;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
}

.favorite-track-button.is-favorite {
    color: #dfa5aa;
    border-color: rgba(223, 165, 170, 0.5);
}

.inline-play-button {
    font: inherit;
}

.inline-track-player {
    flex: 1 0 100%;
    width: 100%;
    margin-top: 12px;
}

.inline-track-player iframe {
    width: 100%;
    min-height: 260px;
    border: 0;
    border-radius: 7px;
}

.track-skeleton {
    position: relative;
    min-height: 112px;
    overflow: hidden;
    pointer-events: none;
}

.track-skeleton::before,
.track-skeleton::after {
    content: "";
    position: absolute;
    left: 20px;
    height: 14px;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.05) 25%,
        rgba(255, 255, 255, 0.11) 50%,
        rgba(255, 255, 255, 0.05) 75%
    );
    background-size: 200% 100%;
    border-radius: 5px;
    animation: skeletonSweep 1.3s ease-in-out infinite;
}

.track-skeleton::before {
    top: 28px;
    width: 48%;
}

.track-skeleton::after {
    top: 59px;
    width: 68%;
}

.track-controls label {
    display: grid;
    gap: 7px;
    color: var(--muted);
    font-size: 13px;
    font-weight: bold;
}

.track-controls input:not([type="checkbox"]),
.track-controls select,
.modal-content input {
    min-height: 42px;
    border-radius: 8px;
}

.track-controls input:not([type="checkbox"]),
.track-controls select {
    width: 100%;
    box-sizing: border-box;
    padding: 10px 12px;
    color: var(--text);
    background-color: rgba(20, 20, 20, 0.85);
    border: 1px solid rgba(196, 164, 132, 0.22);
    font-family: inherit;
}

.track-controls input:not([type="checkbox"]):focus,
.track-controls select:focus,
.modal-content input:focus {
    outline: 3px solid rgba(127, 183, 173, 0.24);
    border-color: var(--teal);
}

.track-result-count {
    color: var(--muted);
    margin: 0 0 12px;
    font-size: 14px;
}

.track-loading {
    color: var(--muted);
    margin: 0;
    padding: 18px;
    background: var(--panel-background);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 8px 22px var(--shadow-color);
}

.track-card[hidden] {
    display: none;
}

.track-card h2,
.track-card h3 {
    margin: 0 0 8px;
    color: var(--text);
    font-size: 17px;
    line-height: 1.35;
}

.tracks-library-page .track-controls {
    display: flex;
    justify-content: space-between;
    grid-template-columns: none;
    gap: 18px;
    margin: 0 0 18px;
    padding: 13px 18px;
    border-left: 5px solid var(--teal);
    border-radius: 7px;
    box-shadow: 0 16px 36px var(--shadow-color);
}

.tracks-library-page .track-result-count {
    margin: 20px 0 14px;
    font-size: 15px;
    font-weight: 700;
}

.tracks-library-page .all-tracks-grid {
    gap: 18px;
    margin-top: 28px;
}

.tracks-library-page .all-tracks-grid.is-flipping-tracks .track-card {
    will-change: transform, opacity;
}

.tracks-library-page .track-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
    --track-cover-y: 0px;
    min-height: 150px;
    padding: 22px 24px 22px clamp(368px, 25vw, 450px);
    border-left-width: 0;
    overflow: hidden;
}

.tracks-library-page .track-card::after {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    z-index: 0;
    width: clamp(340px, 23vw, 424px);
    background:
        linear-gradient(90deg, rgba(42, 30, 21, 0.04), rgba(42, 30, 21, 0.01)),
        var(--track-cover-url, linear-gradient(135deg, rgba(154, 107, 68, 0.92), rgba(127, 183, 173, 0.52))),
        linear-gradient(135deg, rgba(154, 107, 68, 0.92), rgba(127, 183, 173, 0.52));
    background-position: center calc(50% + var(--track-cover-y, 0px));
    background-repeat: no-repeat;
    background-size: cover;
    border-right: 1px solid color-mix(in srgb, var(--border-soft) 72%, transparent);
    opacity: 0.98;
    filter: saturate(1) contrast(0.98);
    transition: width 0.3s ease, opacity 0.3s ease, filter 0.3s ease;
}

.tracks-library-page .track-card:hover::after {
    width: clamp(352px, 24vw, 442px);
    opacity: 1;
    filter: saturate(1.06) contrast(1.02);
}

.tracks-library-page .track-card > * {
    position: relative;
    z-index: 1;
}

.tracks-library-page .track-card:hover {
    transform: translateY(-3px);
}

.tracks-library-page .track-card-clickable {
    cursor: pointer;
}

.tracks-library-page .track-card-clickable:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--teal) 74%, white);
    outline-offset: 4px;
}

.tracks-library-page .track-card-title-row {
    align-items: flex-start;
}

.tracks-library-page .track-card h2,
.tracks-library-page .track-card h3 {
    font-size: 18px;
    line-height: 1.25;
}

.tracks-library-page .track-meta {
    gap: 8px;
    margin-top: 12px;
}

.tracks-library-page .track-actions {
    flex-wrap: nowrap;
    justify-content: flex-end;
    align-items: center;
    gap: 14px;
}

.tracks-library-page .track-secondary-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-left: 16px;
    border-left: 1px solid var(--divider-color);
}

.tracks-library-page .track-secondary-actions .track-secondary-action {
    min-width: 86px;
    text-align: center;
}

.tracks-library-page .inline-track-player {
    grid-column: 1 / -1;
}

.track-scroll-windmill {
    position: fixed;
    right: clamp(22px, 3.4vw, 72px);
    bottom: clamp(82px, 8vh, 118px);
    z-index: 5;
    display: none;
    width: clamp(76px, 5.6vw, 104px);
    aspect-ratio: 1;
    pointer-events: none;
    opacity: 1;
    transform: none;
    filter: drop-shadow(0 18px 28px var(--shadow-color));
}

.track-scroll-windmill.is-positioned {
    display: block;
}

.track-scroll-windmill::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: -1;
    width: 72%;
    height: 72%;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(127, 183, 173, 0.2), rgba(196, 164, 132, 0.08) 42%, transparent 72%);
    transform: translate(-50%, -50%);
}

.track-scroll-windmill-svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
    transform-box: fill-box;
    transform-origin: center;
}

.track-scroll-five-blade-svg {
    border-radius: 999px;
}

.track-scroll-five-blade-rotor {
    transform-box: view-box;
    transform-origin: center;
}

.track-scroll-five-blade-rotor path,
.track-scroll-five-blade-rotor use {
    fill: url("#trackFiveBlade");
    stroke: color-mix(in srgb, var(--surface) 68%, transparent);
    stroke-width: 4;
    stroke-linejoin: round;
}

.track-scroll-five-blade-hub {
    fill: url("#trackFiveBladeHub");
    stroke: color-mix(in srgb, var(--teal) 70%, var(--gold));
    stroke-width: 4;
}

.track-scroll-five-blade-core {
    fill: var(--teal);
    stroke: color-mix(in srgb, var(--surface) 82%, white 18%);
    stroke-width: 2;
}

html[data-theme="light"] .track-scroll-five-blade-rotor path,
html[data-theme="light"] .track-scroll-five-blade-rotor use {
    stroke: color-mix(in srgb, var(--paper) 78%, transparent);
}

@media (max-width: 1180px) {
    .track-scroll-windmill {
        width: 72px;
    }
}

@media (max-width: 960px) {
    .track-scroll-windmill {
        right: 18px;
        bottom: 82px;
        width: 56px;
    }
}

@media (max-width: 520px) {
    .track-scroll-windmill {
        right: 14px;
        bottom: 76px;
        width: 50px;
    }
}

.key-finder-result {
    padding: 16px;
    background: rgba(18, 18, 18, 0.55);
    border: 1px solid rgba(127, 183, 173, 0.2);
    border-radius: var(--radius);
}

.key-finder-empty,
.key-finder-result.is-loading,
.key-finder-result.is-error {
    color: var(--muted);
}

.key-finder-result.is-loading {
    border-color: rgba(196, 164, 132, 0.35);
}

.key-finder-result.is-error {
    color: #e0b7ba;
    border-color: rgba(167, 111, 115, 0.45);
}

.result-summary {
    display: grid;
    gap: 5px;
    margin-bottom: 14px;
}

.result-kicker,
.result-source {
    color: var(--muted);
    font-size: 13px;
    font-weight: bold;
}

.confidence-row {
    display: grid;
    gap: 8px;
    margin: 14px 0;
}

.confidence-label {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: var(--muted);
    font-size: 14px;
}

.confidence-label strong {
    color: var(--gold-light);
}

.confidence-bar {
    height: 8px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
}

.confidence-bar span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--teal), var(--gold));
    border-radius: inherit;
}

.result-explanation {
    display: grid;
    gap: 10px;
    margin-top: 14px;
    padding: 13px;
    background: var(--result-explanation-background, rgba(127, 183, 173, 0.07));
    border: 1px solid var(--result-explanation-border, rgba(127, 183, 173, 0.18));
    border-radius: 8px;
}

.result-explanation-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--muted);
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.result-explanation-heading strong {
    color: var(--gold-light);
    font-size: 13px;
    text-align: right;
}

.result-explanation-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.result-explanation-card {
    display: grid;
    align-content: start;
    gap: 6px;
    min-height: 126px;
    padding: 11px 12px;
    background: var(--result-explanation-card-background, rgba(18, 18, 18, 0.36));
    border: 1px solid var(--result-explanation-card-border, rgba(196, 164, 132, 0.14));
    border-radius: 8px;
}

.result-explanation-card h4 {
    margin: 0;
    color: var(--gold-light);
    font-size: 13px;
}

.result-explanation-card p {
    margin: 0;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.55;
}

.result-details {
    display: grid;
    gap: 8px;
    margin-top: 14px;
}

.result-details p {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin: 0;
    color: var(--text);
}

.result-details p span {
    color: var(--muted);
    flex-shrink: 0;
}

.result-details-secondary {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.result-evidence-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-top: 14px;
}

.result-evidence-grid div {
    display: grid;
    gap: 4px;
    padding: 10px 12px;
    background: rgba(42, 42, 42, 0.72);
    border: 1px solid rgba(196, 164, 132, 0.14);
    border-radius: 8px;
}

.result-evidence-grid span,
.result-analysis-notes span,
.result-ranking-block h4 {
    color: var(--muted);
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.result-evidence-grid strong {
    color: var(--gold-light);
    font-size: 17px;
}

.result-ranking-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.result-ranking-block {
    padding: 12px;
    background: rgba(18, 18, 18, 0.38);
    border: 1px solid rgba(127, 183, 173, 0.16);
    border-radius: 8px;
}

.result-ranking-block h4 {
    margin: 0 0 9px;
}

.result-ranking-block ul {
    display: grid;
    gap: 7px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.result-ranking-block li {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    color: var(--text);
    font-size: 13px;
}

.result-ranking-block li span {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.result-ranking-block li strong {
    color: var(--gold-light);
    flex-shrink: 0;
}

.result-analysis-notes {
    display: grid;
    gap: 8px;
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.result-analysis-notes p {
    display: grid;
    gap: 3px;
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.key-finder-candidates li strong {
    color: var(--gold-light);
    font-size: 14px;
}

.key-finder-candidates-note {
    display: block;
    margin-top: 8px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.45;
}

.error-report {
    display: grid;
    gap: 12px;
}

.error-report strong {
    color: #e0b7ba;
    font-size: 17px;
}

.error-report p {
    margin: 0;
}

.error-report dl {
    display: grid;
    gap: 8px;
    margin: 0;
}

.error-report dl div {
    display: grid;
    gap: 4px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.error-report dt {
    color: var(--muted);
    font-size: 13px;
    font-weight: bold;
}

.error-report dd {
    margin: 0;
    color: var(--text);
    overflow-wrap: anywhere;
}

.error-report code {
    color: var(--gold-light);
}

.compact-heading {
    margin-bottom: 14px;
}

.instruction-panel {
    color: var(--gold-light);
    font-size: 14px;
    margin-top: 15px;
    background: rgba(42, 42, 42, 0.88);
    padding: 15px;
    border-radius: var(--radius);
    border-left: 4px solid var(--teal);
    line-height: 1.6;
}

.instruction-panel p {
    margin: 8px 0 0;
}

.modal-content h2 {
    color: var(--gold);
    margin: 0 0 16px;
    font-size: 22px;
}

#codeOutput[hidden] {
    display: none;
}

@media (max-width: 900px) {
    .track-controls {
        grid-template-columns: 1fr 1fr;
    }

    .tracks-library-page .track-controls {
        grid-template-columns: minmax(0, 1fr);
    }

    .tracks-library-page .page-heading-row {
        align-items: center;
    }

    .tracks-library-page .track-card {
        grid-template-columns: 1fr;
        gap: 16px;
        padding-left: clamp(300px, 38vw, 356px);
    }

    .tracks-library-page .track-actions {
        justify-content: flex-start;
        width: 100%;
    }

    .track-controls .search-field {
        grid-column: 1 / -1;
    }

    .progression-control-groups {
        grid-template-columns: 1fr;
    }

    .playback-level-row {
        grid-template-columns: 82px repeat(2, minmax(130px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-links a.active::after {
        bottom: 1px;
    }

    .start-grid,
    .track-controls {
        grid-template-columns: 1fr;
    }

    .track-controls {
        padding: 16px 0;
    }

    .tracks-library-page {
        margin-top: 48px;
    }

    .tracks-library-page .page-heading-row {
        display: grid;
        justify-items: center;
        text-align: center;
        gap: 18px;
        margin-bottom: 32px;
    }

    .tracks-library-page h1 {
        font-size: 44px;
    }

    .tracks-library-page .hero-tagline {
        font-size: 22px;
    }

    .tracks-library-page .track-controls {
        grid-template-columns: minmax(0, 1fr);
        padding: 20px;
        border-left-width: 4px;
    }

    .tracks-library-page .track-controls .search-field {
        max-width: none;
    }

    .track-pill-filter {
        align-items: flex-start;
        gap: 8px 10px;
    }

    .track-pill-filter > span {
        width: 100%;
        margin-right: 0;
    }

    .track-filter-actions {
        grid-column: 1 / -1;
        justify-content: space-between;
    }

    .tracks-library-page .track-filter-actions {
        align-items: stretch;
        justify-content: center;
        gap: 12px;
    }

    .tracks-library-page .favorites-filter {
        justify-content: center;
    }

    .tracks-library-page .track-card {
        padding: 148px 18px 18px;
    }

    .tracks-library-page .track-card::after {
        inset: 0 0 auto 0;
        width: auto;
        height: 124px;
        background-position: center;
        border-right: 0;
        border-bottom: 1px solid color-mix(in srgb, var(--border-soft) 72%, transparent);
    }

    .tracks-library-page .track-card:hover::after {
        width: auto;
    }

    .tracks-library-page .track-card-title-row {
        gap: 10px;
    }

    .tracks-library-page .track-actions,
    .tracks-library-page .track-secondary-actions {
        width: 100%;
    }

    .tracks-library-page .track-actions {
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
    }

    .tracks-library-page .track-secondary-actions {
        justify-content: center;
        flex-wrap: wrap;
        padding-left: 0;
        border-left: 0;
        border-top: 1px solid var(--divider-color);
        padding-top: 12px;
    }

    .track-controls .secondary-button {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }

    .result-details p,
    .confidence-label {
        display: grid;
        gap: 3px;
    }

    .result-explanation-grid,
    .result-evidence-grid,
    .result-ranking-grid {
        grid-template-columns: 1fr;
    }

    .result-explanation-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
    }

    .progression-card {
        align-items: stretch;
        flex-direction: column;
    }

    .progression-toolbar-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
    }

    .progression-control-groups,
    .chord-setting-controls,
    .playback-controls,
    .playback-level-row,
    .playback-option-row {
        grid-template-columns: 1fr;
    }

    .progression-control-group summary {
        padding-block: 13px;
    }

    .progression-play-button,
    .progression-controls .secondary-button {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }

    .progression-controls label,
    .progression-controls input[type="range"] {
        width: 100%;
    }

    .playback-controls .metronome-toggle,
    .playback-controls .backing-toggle {
        align-self: stretch;
    }

    .track-secondary-actions {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        width: 100%;
        padding: 8px 0 0;
        border-top: 1px solid var(--border-soft);
        border-left: 0;
    }

    .track-secondary-action {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }
}

.modal-open {
    overflow: hidden;
}

.status-page {
    width: min(760px, calc(100% - 36px));
    min-height: calc(100vh - 150px);
    margin: 0 auto;
    display: grid;
    place-content: center;
    justify-items: start;
    gap: 18px;
}

.status-page h1,
.status-page p {
    margin: 0;
}

.status-page h1 {
    max-width: 720px;
    color: var(--gold);
    font-family: "Noto Serif TC", serif;
    font-size: 58px;
    line-height: 1.05;
}

.status-page > p:not(.status-page-code) {
    max-width: 600px;
    color: var(--muted);
    font-size: 17px;
    line-height: 1.7;
}

.status-page-code {
    color: var(--teal);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.status-page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.status-page-actions a,
.status-page-actions button {
    box-sizing: border-box;
    text-decoration: none;
}

.status-page-spinner {
    width: 38px;
    height: 38px;
    border: 3px solid rgba(124, 190, 181, 0.2);
    border-top-color: var(--teal);
    border-radius: 50%;
    animation: keyFinderSpin 0.85s linear infinite;
}

/* ====================
   Professional home page
   ==================== */
.home-page {
    min-height: 100vh;
}

.home-section-inner,
.home-feature-inner {
    width: min(1120px, calc(100% - 48px));
    margin: 0 auto;
}

.home-hero {
    --jam-mark-fill: color-mix(in srgb, var(--brand-brown) 1.8%, transparent);
    --jam-mark-line: color-mix(in srgb, var(--brand-brown) 18%, transparent);
    padding: 82px 0 54px;
}

.home-hero .home-section-inner {
    position: relative;
    isolation: isolate;
    max-width: 920px;
    margin-left: max(24px, calc((100% - 1120px) / 2));
}

.home-jam-mark {
    position: absolute;
    top: 0;
    left: -22px;
    z-index: 0;
    width: min(740px, calc(100vw - 72px));
    max-width: 100%;
    height: auto;
    overflow: visible;
    pointer-events: none;
    user-select: none;
}

.home-jam-mark-text {
    fill: var(--jam-mark-fill);
    stroke: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    font-family: "Times New Roman", "Noto Serif TC", serif;
    font-size: 216px;
    font-weight: 400;
    letter-spacing: 0;
    opacity: 0;
    animation: homeJamSettle 1.35s ease 1.75s forwards;
}

.home-jam-mark-line {
    fill: none;
    stroke: var(--jam-mark-line);
    stroke-width: 14;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 1480;
    stroke-dashoffset: 1480;
    opacity: 0.64;
    animation:
        homeJamWrite 2.05s cubic-bezier(0.19, 1, 0.22, 1) 0.22s forwards,
        homeJamLineFade 0.82s ease 1.72s forwards;
}

@keyframes homeJamWrite {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes homeJamSettle {
    to {
        opacity: 1;
    }
}

@keyframes homeJamLineFade {
    to {
        opacity: 0;
    }
}

html[data-theme="dark"] .home-hero {
    --jam-mark-fill: color-mix(in srgb, var(--gold-light) 2.2%, transparent);
    --jam-mark-line: color-mix(in srgb, var(--gold-light) 16%, transparent);
}

.home-hero .home-section-inner > :not(.home-jam-mark) {
    position: relative;
    z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
    .home-jam-mark-text {
        opacity: 1;
        animation: none;
    }

    .home-jam-mark-line {
        opacity: 0;
        animation: none;
    }
}

.home-hero h1 {
    max-width: 760px;
    margin: 0 0 14px;
    font-size: 68px;
    line-height: 1;
}

.home-hero .home-split-word,
.home-hero .home-split-char {
    display: inline-block;
    will-change: transform, opacity;
}

.home-hero .home-split-word {
    white-space: nowrap;
}

.home-eyebrow {
    margin: 0 0 12px;
    color: var(--teal);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.home-lead {
    max-width: 680px;
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 18px;
    line-height: 1.75;
}

.home-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: 760px;
    margin: 42px 0 0;
    padding: 18px 0;
    border-top: 1px solid var(--border-soft);
    border-bottom: 1px solid var(--border-soft);
}

.home-metrics div {
    padding: 0 22px;
    border-right: 1px solid var(--border-soft);
}

.home-metrics div:first-child {
    padding-left: 0;
}

.home-metrics div:last-child {
    border-right: 0;
}

.home-metrics dt {
    color: var(--gold);
    font-family: "Noto Serif TC", serif;
    font-size: 26px;
    font-weight: bold;
}

.home-metrics dd {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 13px;
}

.home-tools,
.home-releases,
.home-about {
    padding: 64px 0;
}

.home-section-heading {
    margin-bottom: 24px;
}

.home-section-heading h2,
.home-feature-band h2,
.about-copy h2 {
    margin: 0;
    font-family: "Noto Serif TC", serif;
    font-size: 34px;
    line-height: 1.2;
}

.home-section-heading-row {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 24px;
}

.home-start-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.home-start-grid .start-card:last-child:nth-child(odd) {
    grid-column: 1 / -1;
}

.home-start-grid .start-card {
    min-height: 118px;
}

.home-step-rail {
    width: 100%;
    margin-top: 24px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--teal) 48%, var(--gold) 24%) transparent;
    scroll-snap-type: x mandatory;
}

.home-step-rail::-webkit-scrollbar {
    height: 8px;
}

.home-step-rail::-webkit-scrollbar-track {
    background: color-mix(in srgb, var(--panel-background) 78%, transparent);
    border-radius: 999px;
}

.home-step-rail::-webkit-scrollbar-thumb {
    background: linear-gradient(90deg, var(--teal), var(--gold));
    border-radius: 999px;
}

.home-step-rail.is-gsap-driven {
    overflow: hidden;
}

.home-step-track {
    display: flex;
    gap: 18px;
    width: max-content;
    min-width: 100%;
    margin-top: 0;
    padding: 2px 2px 14px;
}

.home-step-track .start-card,
.home-step-track .start-card:last-child:nth-child(odd) {
    grid-column: auto;
}

.home-step-track .start-card {
    flex: 0 0 min(72vw, 430px);
    align-content: center;
    min-height: 240px;
    padding: clamp(24px, 3vw, 34px);
    scroll-snap-align: start;
}

.home-step-card {
    isolation: isolate;
    perspective: 900px;
}

.home-step-card::after {
    content: "";
    position: absolute;
    right: 24px;
    bottom: 22px;
    z-index: 0;
    width: 150px;
    height: 150px;
    border: 1px solid color-mix(in srgb, var(--teal) 38%, transparent);
    border-radius: 999px;
    background:
        radial-gradient(circle, color-mix(in srgb, var(--teal) 15%, transparent), transparent 66%),
        radial-gradient(circle at 72% 30%, color-mix(in srgb, var(--gold) 14%, transparent), transparent 48%);
    opacity: 0.22;
    transform: scale(0.86);
    transition: opacity 0.28s ease, transform 0.32s ease, border-radius 0.32s ease;
}

.home-step-card > * {
    position: relative;
    z-index: 1;
}

.home-step-card:hover::after {
    opacity: 0.38;
    transform: scale(1);
}

.step-motif {
    position: absolute;
    right: 26px;
    bottom: 26px;
    z-index: 0;
    width: 132px;
    height: 100px;
    color: color-mix(in srgb, var(--gold) 62%, var(--teal));
    opacity: 0.55;
    pointer-events: none;
    transform-origin: center;
    transition: opacity 0.3s ease, transform 0.34s ease, filter 0.34s ease;
}

.step-motif span {
    position: absolute;
    display: block;
}

.home-step-card:hover .step-motif {
    opacity: 0.78;
    filter: saturate(1.08);
}

.step-motif-tracks {
    right: 24px;
    bottom: 24px;
    width: 148px;
    height: 104px;
    border: 1px solid color-mix(in srgb, var(--gold) 30%, transparent);
    border-radius: 18px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--panel-background) 88%, transparent), color-mix(in srgb, var(--teal) 10%, transparent)),
        linear-gradient(90deg, color-mix(in srgb, var(--gold) 12%, transparent), transparent 62%);
    box-shadow: inset 0 -18px 28px color-mix(in srgb, var(--teal) 8%, transparent);
    transform: rotate(-2deg);
}

.step-motif-tracks::before {
    content: "";
    position: absolute;
    left: 17px;
    top: 18px;
    width: 50px;
    height: 50px;
    border: 2px solid color-mix(in srgb, var(--gold) 42%, transparent);
    border-radius: 999px;
    background:
        radial-gradient(circle, color-mix(in srgb, var(--teal) 50%, var(--gold)) 0 7px, transparent 8px),
        repeating-radial-gradient(circle, transparent 0 11px, color-mix(in srgb, var(--gold) 22%, transparent) 12px 13px);
}

.step-motif-tracks::after {
    content: "";
    position: absolute;
    right: 22px;
    top: 25px;
    width: 36px;
    height: 36px;
    border: 2px solid color-mix(in srgb, var(--teal) 44%, transparent);
    border-radius: 999px;
    background:
        radial-gradient(circle, currentColor 0 5px, transparent 6px),
        repeating-radial-gradient(circle, transparent 0 9px, color-mix(in srgb, var(--teal) 20%, transparent) 10px 11px);
}

.step-motif-tracks span {
    height: 3px;
    border-radius: 999px;
    background: color-mix(in srgb, currentColor 82%, var(--teal));
}

.step-motif-tracks span:nth-child(1) {
    left: 64px;
    top: 44px;
    width: 36px;
    transform: rotate(-5deg);
}

.step-motif-tracks span:nth-child(2) {
    left: 21px;
    right: 21px;
    bottom: 22px;
    height: 8px;
    background:
        linear-gradient(90deg, currentColor 0 12%, transparent 12% 18%, currentColor 18% 27%, transparent 27% 34%, currentColor 34% 48%, transparent 48% 55%, currentColor 55% 68%, transparent 68% 76%, currentColor 76% 100%);
    opacity: 0.7;
}

.step-motif-tracks span:nth-child(3) {
    left: 28px;
    right: 28px;
    bottom: 36px;
    background: linear-gradient(90deg, var(--teal), currentColor);
    opacity: 0.72;
}

.step-motif-tracks span:nth-child(1)::after {
    content: "";
    position: absolute;
    right: -11px;
    top: -5px;
    width: 12px;
    height: 12px;
    border-right: 3px solid currentColor;
    border-bottom: 3px solid currentColor;
    transform: rotate(-45deg);
}

.step-motif-dictionary {
    width: 122px;
    height: 104px;
    right: 30px;
    bottom: 22px;
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--gold) 28%, transparent) 1px, transparent 1px),
        linear-gradient(color-mix(in srgb, var(--teal) 30%, transparent) 1px, transparent 1px);
    background-size: 24px 24px;
    border: 1px solid color-mix(in srgb, var(--gold) 34%, transparent);
    border-radius: 10px;
    transform: rotate(-3deg);
}

.step-motif-dictionary span {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--gold) 72%, var(--surface));
    box-shadow: 0 0 0 5px color-mix(in srgb, var(--teal) 15%, transparent);
}

.step-motif-dictionary span:nth-child(1) { left: 15px; top: 14px; }
.step-motif-dictionary span:nth-child(2) { left: 61px; top: 14px; }
.step-motif-dictionary span:nth-child(3) { left: 38px; top: 55px; }
.step-motif-dictionary span:nth-child(4) { left: 84px; top: 72px; }

.step-motif-scale {
    width: 136px;
    height: 96px;
    right: 24px;
    bottom: 27px;
}

.step-motif-scale::before {
    content: "";
    position: absolute;
    inset: 18px 8px 18px 10px;
    border-top: 2px solid color-mix(in srgb, var(--gold) 36%, transparent);
    border-bottom: 2px solid color-mix(in srgb, var(--teal) 30%, transparent);
    transform: skewX(-18deg);
}

.step-motif-scale::after {
    content: "";
    position: absolute;
    left: 18px;
    right: 18px;
    top: 51px;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--teal), var(--gold));
    transform: rotate(-18deg);
}

.step-motif-scale span {
    width: 16px;
    height: 16px;
    border-radius: 999px;
    background: var(--panel-background);
    border: 3px solid currentColor;
}

.step-motif-scale span:nth-child(1) { left: 14px; top: 60px; }
.step-motif-scale span:nth-child(2) { left: 48px; top: 45px; }
.step-motif-scale span:nth-child(3) { left: 82px; top: 29px; }
.step-motif-scale span:nth-child(4) { left: 116px; top: 14px; }

.step-motif-keyfinder {
    width: 150px;
    height: 108px;
    right: 20px;
    bottom: 20px;
}

.step-motif-keyfinder::before {
    content: "";
    position: absolute;
    left: 10px;
    top: 12px;
    width: 118px;
    height: 82px;
    border: 1px solid color-mix(in srgb, var(--teal) 22%, transparent);
    border-radius: 999px;
    background:
        radial-gradient(circle at 72% 24%, color-mix(in srgb, var(--gold) 16%, transparent), transparent 42%),
        radial-gradient(circle at 28% 76%, color-mix(in srgb, var(--teal) 15%, transparent), transparent 46%);
    transform: rotate(-4deg);
    box-shadow: inset 0 0 0 18px color-mix(in srgb, var(--panel-background) 42%, transparent);
}

.step-motif-keyfinder::after {
    content: "";
    position: absolute;
    left: 70px;
    top: 27px;
    width: 51px;
    height: 9px;
    border-radius: 999px;
    background: currentColor;
    transform: rotate(-8deg);
    opacity: 0.78;
}

.step-motif-keyfinder span {
    width: 24px;
    height: 16px;
    border-radius: 55% 45% 55% 45%;
    background: color-mix(in srgb, currentColor 72%, var(--panel-background));
    box-shadow: 0 0 0 5px color-mix(in srgb, var(--teal) 10%, transparent);
    transform: rotate(-18deg);
}

.step-motif-keyfinder span::before {
    content: "";
    position: absolute;
    right: 1px;
    bottom: 10px;
    width: 4px;
    height: 49px;
    border-radius: 999px;
    background: currentColor;
    transform: rotate(4deg);
}

.step-motif-keyfinder span::after {
    content: "";
    position: absolute;
    right: -11px;
    top: -38px;
    width: 18px;
    height: 24px;
    border-top: 4px solid currentColor;
    border-right: 4px solid currentColor;
    border-radius: 0 16px 0 0;
    transform: rotate(18deg);
    opacity: 0.74;
}

.step-motif-keyfinder span:nth-child(1) {
    left: 24px;
    top: 62px;
    background: color-mix(in srgb, var(--gold) 68%, var(--teal));
}

.step-motif-keyfinder span:nth-child(2) {
    left: 68px;
    top: 60px;
    background: color-mix(in srgb, var(--teal) 70%, var(--gold));
    transform: rotate(-18deg);
}

.step-motif-keyfinder span:nth-child(3) {
    left: 108px;
    top: 53px;
    transform: rotate(-18deg) scale(0.94);
}

.step-motif-keyfinder span:nth-child(2)::before {
    height: 45px;
}

.step-motif-keyfinder span:nth-child(3)::before {
    height: 42px;
}

.step-motif-keyfinder span:nth-child(2)::after,
.step-motif-keyfinder span:nth-child(3)::after {
    display: none;
}

.step-motif-progressions {
    width: 142px;
    height: 106px;
    right: 24px;
    bottom: 22px;
}

.step-motif-progressions::before {
    content: "";
    position: absolute;
    left: 24px;
    top: 16px;
    width: 84px;
    height: 66px;
    border: 3px solid color-mix(in srgb, var(--teal) 34%, transparent);
    border-left-color: color-mix(in srgb, var(--gold) 42%, transparent);
    border-radius: 999px;
    transform: rotate(-18deg);
}

.step-motif-progressions::after {
    content: none;
}

.step-motif-progressions span {
    display: grid;
    place-items: center;
    width: 40px;
    height: 34px;
    border: 1px solid color-mix(in srgb, var(--gold) 38%, transparent);
    border-radius: 11px;
    background:
        linear-gradient(145deg, color-mix(in srgb, var(--panel-background) 92%, transparent), color-mix(in srgb, var(--gold) 18%, transparent));
    box-shadow: 0 8px 18px color-mix(in srgb, var(--shadow-color) 42%, transparent);
}

.step-motif-progressions span::before {
    color: color-mix(in srgb, var(--text) 78%, var(--teal));
    font: 800 12px/1 var(--font-sans);
}

.step-motif-progressions span:nth-child(1) {
    left: 5px;
    top: 36px;
}

.step-motif-progressions span:nth-child(1)::before {
    content: "I";
}

.step-motif-progressions span:nth-child(2) {
    left: 43px;
    top: 10px;
}

.step-motif-progressions span:nth-child(2)::before {
    content: "vi";
}

.step-motif-progressions span:nth-child(3) {
    left: 78px;
    top: 58px;
}

.step-motif-progressions span:nth-child(3)::before {
    content: "IV";
}

.step-motif-progressions span:nth-child(4) {
    left: 101px;
    top: 25px;
}

.step-motif-progressions span:nth-child(4)::before {
    content: "V";
}

.step-motif-trainer {
    width: 128px;
    height: 98px;
    right: 28px;
    bottom: 26px;
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--gold) 28%, transparent) 1px, transparent 1px),
        linear-gradient(color-mix(in srgb, var(--teal) 24%, transparent) 1px, transparent 1px);
    background-size: 25px 24px;
    border-left: 3px solid color-mix(in srgb, var(--gold) 38%, transparent);
    transform: perspective(340px) rotateX(15deg) rotateZ(-2deg);
}

.step-motif-trainer::before {
    content: "";
    position: absolute;
    left: 64px;
    top: 35px;
    width: 30px;
    height: 30px;
    border: 3px solid color-mix(in srgb, var(--teal) 75%, var(--gold));
    border-radius: 999px;
    box-shadow: 0 0 0 8px color-mix(in srgb, var(--teal) 12%, transparent);
}

.step-motif-trainer span {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: currentColor;
}

.step-motif-trainer span:nth-child(1) { left: 18px; top: 22px; }
.step-motif-trainer span:nth-child(2) { left: 64px; top: 45px; }
.step-motif-trainer span:nth-child(3) { left: 103px; top: 70px; }

.home-step-card .step-motif {
    border: 0;
    background: none;
    box-shadow: none;
    transform: none;
}

.home-step-card .step-motif::before,
.home-step-card .step-motif::after {
    content: none;
}

.step-motif svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.step-motif .home-draw,
.step-motif .motif-panel {
    fill: none;
    stroke: currentColor;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}

.step-motif .home-draw-soft {
    stroke: color-mix(in srgb, var(--muted) 46%, transparent);
    stroke-width: 2;
}

.step-motif .home-draw-accent {
    stroke: color-mix(in srgb, var(--teal) 72%, var(--gold));
    stroke-width: 3.25;
}

.step-motif .motif-panel {
    stroke: color-mix(in srgb, var(--gold) 30%, transparent);
    stroke-width: 1.6;
}

.step-motif .motif-note,
.step-motif .home-motion-dot {
    fill: color-mix(in srgb, var(--panel-background) 82%, var(--gold));
    stroke: color-mix(in srgb, var(--teal) 76%, var(--gold));
    stroke-width: 3;
    transform-box: fill-box;
    transform-origin: center;
}

.step-motif .motif-root,
.step-motif .home-motion-dot-gold {
    fill: color-mix(in srgb, var(--gold) 74%, var(--panel-background));
    stroke: color-mix(in srgb, var(--gold) 84%, var(--teal));
}

.step-motif .motif-note-symbol {
    fill: color-mix(in srgb, var(--gold) 70%, var(--teal));
    opacity: 0.7;
}

.step-motif .motif-note-symbol-alt {
    fill: color-mix(in srgb, var(--teal) 72%, var(--gold));
}

.step-motif .motif-note-symbol-small {
    opacity: 0.52;
}

.step-motif .motif-roman rect {
    fill: color-mix(in srgb, var(--panel-background) 86%, transparent);
    stroke: color-mix(in srgb, var(--gold) 34%, transparent);
    stroke-width: 1.4;
}

.step-motif .motif-roman text {
    fill: color-mix(in srgb, var(--text) 72%, var(--teal));
    font: 800 13px/1 var(--font-sans);
    text-anchor: middle;
    dominant-baseline: middle;
}

.home-step-card[data-motion="groove"] .step-motif {
    width: 158px;
    height: 118px;
    color: color-mix(in srgb, var(--gold) 72%, var(--teal));
}

.home-step-card[data-motion="flip"] .step-motif {
    width: 142px;
    height: 112px;
    color: color-mix(in srgb, var(--teal) 64%, var(--gold));
}

.home-step-card[data-motion="map"] .step-motif {
    width: 146px;
    height: 110px;
    color: color-mix(in srgb, var(--teal) 74%, var(--gold));
}

.home-step-card[data-motion="scan"] .step-motif {
    width: 154px;
    height: 116px;
    color: color-mix(in srgb, var(--gold) 66%, var(--teal));
}

.home-step-card[data-motion="cascade"] .step-motif {
    width: 150px;
    height: 116px;
    color: color-mix(in srgb, var(--gold) 60%, var(--teal));
}

.home-step-card[data-motion="pulse"] .step-motif {
    width: 144px;
    height: 112px;
    color: color-mix(in srgb, var(--teal) 70%, var(--gold));
}

html[data-theme="light"] .step-motif {
    opacity: 0.42;
}

html[data-theme="light"] .home-step-card:hover .step-motif {
    opacity: 0.66;
}

.home-step-card .home-step-word,
.home-step-card .home-step-char {
    display: inline-block;
    will-change: transform, opacity;
}

.home-step-card .home-step-word {
    white-space: nowrap;
}

.home-step-track .start-card strong {
    font-size: clamp(24px, 2.8vw, 34px);
    line-height: 1.08;
}

.home-step-track .start-card span:last-child {
    max-width: 340px;
    font-size: 16px;
}

.home-feature-band {
    padding: 42px 0;
    background: color-mix(in srgb, var(--panel-background) 68%, transparent);
    border-top: 1px solid var(--border-soft);
    border-bottom: 1px solid var(--border-soft);
}

.home-feature-inner {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(360px, 1.15fr);
    align-items: center;
    gap: 54px;
}

.home-feature-inner > div > p:last-child {
    margin-bottom: 0;
    color: var(--muted);
    line-height: 1.7;
}

.home-audio-player {
    margin: 0;
}

.home-video-player {
    padding: 12px;
}

.home-video-player iframe {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    min-height: 260px;
    border: 0;
    border-radius: 7px;
    background: #080808;
}

.home-release-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.home-release-card {
    position: relative;
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 360px;
    padding: 0;
    overflow: hidden;
    background: color-mix(in srgb, var(--panel-background) 92%, transparent);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 14px 34px var(--shadow-color);
}

.home-release-card::before {
    display: none;
}

.release-cover-link {
    position: relative;
    display: block;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #0f0d0b;
    border-bottom: 1px solid var(--border-soft);
}

.release-cover-link::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, transparent 45%, rgba(0, 0, 0, 0.36)),
        linear-gradient(90deg, rgba(0, 0, 0, 0.08), transparent 62%);
    opacity: 0.78;
    pointer-events: none;
    transition: opacity 0.28s ease;
}

.release-cover-link img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.01);
    transition: transform 0.42s ease, filter 0.28s ease;
}

.home-release-card:hover .release-cover-link img {
    filter: saturate(1.08) contrast(1.02);
    transform: scale(1.055);
}

.home-release-card:hover .release-cover-link::after {
    opacity: 0.46;
}

.release-copy {
    display: grid;
    align-content: start;
    padding: 18px 20px 20px;
}

.release-note {
    margin: 9px 0 14px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.home-release-card h3 {
    margin: 0;
    color: var(--text);
    font-size: 18px;
    line-height: 1.35;
}

.home-release-card .track-meta {
    margin-top: 0;
}

.release-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 18px;
}

.home-release-card .text-link {
    margin-top: 0;
}

.release-number {
    margin: 0 0 10px;
    color: var(--teal);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.text-link {
    color: var(--teal);
    font-weight: bold;
    text-underline-offset: 4px;
}

.text-link:hover {
    color: var(--gold-light);
}

.home-about {
    background: color-mix(in srgb, var(--panel-background) 46%, transparent);
    border-top: 1px solid var(--border-soft);
}

.home-about-layout {
    display: grid;
    grid-template-columns: minmax(240px, 340px) minmax(0, 1fr);
    align-items: center;
    gap: 64px;
}

.about-portrait {
    margin: 0;
}

.about-portrait img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    object-position: center 25%;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 18px 42px var(--shadow-color);
}

.about-portrait figcaption {
    margin-top: 10px;
    color: var(--muted);
    font-size: 12px;
}

.about-copy {
    max-width: 640px;
}

.about-copy > p:not(.home-eyebrow) {
    color: var(--muted);
    line-height: 1.8;
}

.about-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

@media (max-width: 1180px) {
    .navbar {
        display: grid;
        grid-template-columns: 54px minmax(0, 1fr) 54px;
        align-items: center;
        gap: 8px;
        padding: 16px clamp(18px, 4vw, 32px);
    }

    .logo {
        grid-column: 2;
        justify-self: center;
        max-width: 100%;
        text-align: center;
        font-size: clamp(26px, 5.2vw, 36px);
        line-height: 1.1;
        overflow-wrap: anywhere;
    }

    .nav-menu-button {
        grid-column: 3;
        justify-self: end;
        display: grid;
        width: 54px;
        height: 54px;
    }

    .navbar.menu-open .nav-menu-button span:nth-child(1) {
        transform: translate(-50%, -50%) rotate(45deg);
    }

    .navbar.menu-open .nav-menu-button span:nth-child(2) {
        opacity: 0;
        transform: translate(-50%, -50%) scaleX(0);
    }

    .navbar.menu-open .nav-menu-button span:nth-child(3) {
        transform: translate(-50%, -50%) rotate(-45deg);
    }

    .nav-links {
        display: grid;
        grid-column: 1 / -1;
        justify-items: center;
        width: 100%;
        gap: 8px;
        max-height: 0;
        overflow: hidden;
        padding-top: 0;
        margin-top: 0;
        border-top: 1px solid rgba(196, 164, 132, 0.14);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-7px);
        transition:
            max-height 0.28s ease,
            padding-top 0.22s ease,
            opacity 0.18s ease,
            transform 0.22s ease,
            visibility 0s linear 0.28s;
    }

    .navbar.menu-open .nav-links {
        max-height: 780px;
        padding-top: 22px;
        padding-bottom: 18px;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
        transition-delay: 0s, 0s, 0.07s, 0.07s, 0s;
    }

    .nav-links > li {
        display: flex;
        justify-content: center;
        opacity: 0;
        transform: translateY(-4px);
        transition: opacity 0.16s ease, transform 0.16s ease;
    }

    .navbar.menu-open .nav-links > li {
        opacity: 1;
        transform: translateY(0);
    }

    .navbar.menu-open .nav-links > li:nth-child(1) {
        transition-delay: 0.09s;
    }

    .navbar.menu-open .nav-links > li:nth-child(2) {
        transition-delay: 0.115s;
    }

    .navbar.menu-open .nav-links > li:nth-child(3) {
        transition-delay: 0.14s;
    }

    .navbar.menu-open .nav-links > li:nth-child(4) {
        transition-delay: 0.165s;
    }

    .navbar.menu-open .nav-links > li:nth-child(5) {
        transition-delay: 0.19s;
    }

    .navbar.menu-open .nav-links > li:nth-child(6) {
        transition-delay: 0.215s;
    }

    .navbar.menu-open .nav-links > li:nth-child(7) {
        transition-delay: 0.24s;
    }

    .navbar.menu-open .nav-links > li:nth-child(8) {
        transition-delay: 0.265s;
    }

    .navbar.menu-open .nav-links > li:nth-child(9) {
        transition-delay: 0.29s;
    }

    .navbar.menu-open .nav-links > li:nth-child(10) {
        transition-delay: 0.315s;
    }

    .nav-links li,
    .nav-links a,
    .theme-toggle {
        width: min(360px, 82vw);
    }

    .nav-links a,
    .theme-toggle {
        box-sizing: border-box;
        display: inline-flex;
        justify-content: center;
        align-items: center;
        min-height: 46px;
        padding: 11px 18px;
        border-radius: 6px;
        text-align: center;
        line-height: 1.35;
    }

    .nav-theme-toggle {
        justify-content: center;
        min-height: 46px;
        border-radius: 999px;
        transform: none;
    }

    .nav-links a.active::after {
        left: 50%;
        right: auto;
        bottom: 2px;
        width: 52px;
        transform: translateX(-50%);
    }

    @media (prefers-reduced-motion: reduce) {
        .nav-links,
        .nav-links > li,
        .nav-menu-button span {
            transition: none;
        }
    }

    .key-finder-status-row,
    .selected-key-heading {
        align-items: stretch;
        flex-direction: column;
    }

    .segmented-control {
        width: 100%;
    }

    .result-actions,
    .progression-card-actions {
        display: grid;
        grid-template-columns: 1fr;
        width: 100%;
    }

    .result-actions a,
    .progression-card-actions button {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }

    .inline-track-player iframe {
        min-height: 210px;
    }

    .status-page {
        justify-items: stretch;
    }

    .status-page h1 {
        font-size: 38px;
    }

    .status-page-actions {
        display: grid;
        grid-template-columns: 1fr;
    }

    .status-page-actions a,
    .status-page-actions button {
        width: 100%;
        text-align: center;
    }

    .home-section-inner,
    .home-feature-inner {
        width: min(100% - 40px, 1120px);
    }

    .home-hero {
        padding: 48px 0 38px;
    }

    .home-hero .home-section-inner {
        margin: 0 auto;
    }

    .home-hero h1 {
        font-size: 44px;
    }

    .home-jam-mark {
        top: 16px;
        left: -4px;
        width: min(410px, calc(100vw - 44px));
    }

    .home-jam-mark-text {
        font-size: 172px;
    }

    .home-jam-mark-line {
        stroke-width: 12;
    }

    .home-lead {
        font-size: 16px;
    }

    .home-metrics {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .home-metrics div,
    .home-metrics div:first-child {
        padding: 0;
        border-right: 0;
    }

    .home-tools,
    .home-releases,
    .home-about {
        padding: 46px 0;
    }

    .home-section-heading h2,
    .home-feature-band h2,
    .about-copy h2 {
        font-size: 28px;
    }

    .home-section-heading-row {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }

    .home-release-grid,
    .home-feature-inner,
    .home-about-layout {
        grid-template-columns: 1fr;
    }

    .home-step-track .start-card {
        flex-basis: min(82vw, 360px);
        min-height: 210px;
    }

    .home-feature-inner {
        gap: 24px;
    }

    .home-about-layout {
        gap: 30px;
    }

    .about-portrait {
        max-width: 320px;
    }
}