:root {
    --primary: #dd614a;
    --secondary: #5dc0eb;
    --accent: #adf5ff;
    --bg: #14151e;
    --surface: #181925;
    --text: hsl(24, 100%, 86%);
    --muted: #98c0f4;
    --border-width: 4px;
    --font-display: "Anton", sans-serif;
    --font-body: "Epilogue", sans-serif;
    --slide-duration: 0.4s;
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

.single-page {
    position: relative;
    width: 100%;
    overflow-y: auto;
}

.section {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem 1.5rem 5rem;
    border-bottom: var(--border-width) solid var(--text);
    scroll-margin-top: 0;
}

.slide-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    overflow-x: hidden;
}

.hero-label,
.hero-title,
.hero-sub,
.hero-visual {
    opacity: 0;
    transform: translateY(20%);
}
.section-hero.active .hero-label,
.section-hero.active .hero-title,
.section-hero.active .hero-sub,
.section-hero.active .hero-visual {
    opacity: 1;
    transform: translateY(0);
}

.hero-text {
    min-width: 0;
}

.hero-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--secondary);
    margin-bottom: 0.75rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(4rem, 12vw, 10rem);
    font-weight: 400;
    line-height: 0.95;
    color: var(--text);
    letter-spacing: 0;
    text-transform: uppercase;
    margin-bottom: 2rem;
}
.hero-sub {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--muted);
    margin-top: 0.75rem;
    max-width: 42ch;
    font-weight: 500;
}
.hero-visual {
    margin-top: 4rem;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 3rem;
    overflow: visible;
}

.hero-inner-wrap {
    overflow: visible;
}

.hero-phone-mockup {
    position: relative;
    width: 320px;
    transform: perspective(1400px) rotateY(-3deg) rotateX(1deg);
    transition: transform 0.4s var(--ease-out-expo);
    cursor: default;
}

.hero-phone-mockup:hover {
    transform: perspective(1400px) rotateY(0deg) rotateX(0deg);
}

.phone-frame {
    position: relative;
    width: 100%;
    border-radius: 44px;
    padding: 12px;
    background: linear-gradient(145deg, #1a1a1a 0%, #0a0a0a 50%, #151515 100%);
    border: 3px solid var(--text);
    box-shadow:
        0 0 0 2px var(--surface),
        0 0 0 5px var(--text),
        inset 0 2px 4px rgba(255, 255, 255, 0.03),
        0 24px 48px rgba(0, 0, 0, 0.5);
}

.phone-notch {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    width: 88px;
    height: 26px;
    background: var(--bg);
    border-radius: 0 0 20px 20px;
    border: 2px solid var(--text);
    border-top: none;
    box-shadow: inset 0 -2px 8px rgba(0, 0, 0, 0.4);
}

.phone-btn {
    position: absolute;
    width: 4px;
    background: var(--surface);
    border: 1px solid var(--muted);
    border-radius: 2px;
}

.phone-btn-vol-up {
    top: 88px;
    left: -7px;
    height: 36px;
}

.phone-btn-vol-down {
    top: 132px;
    left: -7px;
    height: 52px;
}

.phone-btn-power {
    top: 140px;
    right: -7px;
    height: 64px;
}

.phone-screen {
    margin-top: 32px;
    min-height: 420px;
    background: var(--bg);
    border: 2px solid var(--text);
    padding: 1.25rem 1rem;
    position: relative;
    border-radius: 8px;
    box-shadow: inset 0 0 24px rgba(0, 0, 0, 0.5);
}

.billboard-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--accent);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--muted);
}

.billboard-date {
    font-family: var(--font-body);
    font-size: 0.7rem;
    color: var(--muted);
    margin-top: 0.25rem;
}

.billboard-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 320px;
    overflow-y: auto;
}

.billboard-list::-webkit-scrollbar {
    width: 6px;
}
.billboard-list::-webkit-scrollbar-track {
    background: var(--surface);
}
.billboard-list::-webkit-scrollbar-thumb {
    background: var(--muted);
    border: 2px solid var(--surface);
}

.billboard-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 0.45rem 0;
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.billboard-list .rank {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--primary);
    min-width: 2ch;
    flex-shrink: 0;
}

.billboard-list .track-wrap {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.billboard-list .track {
    color: var(--text);
    opacity: 0.95;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.billboard-list .artist {
    color: var(--muted);
    font-size: 0.75rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.billboard-loading .track {
    color: var(--muted);
    font-style: italic;
}

.section-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--secondary);
    margin-bottom: 0.75rem;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 400;
    color: var(--text);
    margin-bottom: 1.5rem;
    letter-spacing: 0.02em;
    text-transform: none;
}
.section-desc {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.7;
    max-width: 48ch;
    margin-bottom: 3rem;
}

.viz-card {
    padding: 1.75rem;
    margin-bottom: 2rem;
    border: var(--border-width) solid var(--text);
    background: var(--surface);
}
.viz-card.brutalist-card {
    border-radius: 0;
}
.viz-card.brutalist-card:hover {
    border-color: var(--secondary);
}
.viz-card h3 {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.75rem;
    padding-bottom: 0;
    text-transform: none;
    letter-spacing: 0.02em;
    text-align: center;
    width: 100%;
    line-height: 1.35;
}

.viz-slot {
    width: 100%;
    min-height: 360px;
    background: var(--bg);
    border: 2px solid var(--muted);
}
.viz-slot.viz-tall {
    min-height: 380px;
}
.viz-slot.viz-table {
    min-height: 280px;
}

.vinyl {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.vinyl .vinyl-desc {
    margin-top: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--muted);
    text-align: center;
    letter-spacing: 0.02em;
    line-height: 1.5;
}

#slider_container {
    margin-top: 1rem;
    margin-bottom: 1rem;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border: var(--border-width) solid var(--text);
    width: 100%;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}
#slider_container .slider-year-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-family: var(--font-body);
}
#slider_container .slider-year-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--muted);
}
#slider_container .slider-year-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent);
    min-width: 4ch;
    text-align: right;
}
#slider_container .slider-track-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
#slider_container .slider-year-min,
#slider_container .slider-year-max {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--muted);
    flex-shrink: 0;
}
#slider_container .slider-input-wrap {
    flex: 1;
    min-width: 0;
}
#slider_container input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 12px;
    background: var(--bg);
    border: 2px solid var(--text);
    cursor: pointer;
    display: block;
}
#slider_container input[type="range"]:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 2px var(--secondary);
}
#slider_container input[type="range"]::-webkit-slider-runnable-track {
    height: 8px;
    background: var(--bg);
    border: none;
}
#slider_container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    margin-top: -10px;
    background: var(--accent);
    border: 2px solid var(--text);
    cursor: pointer;
    transition: border-color 0.2s var(--ease-out-expo);
}
#slider_container input[type="range"]::-webkit-slider-thumb:hover {
    border-color: var(--secondary);
}
#slider_container input[type="range"]::-moz-range-track {
    height: 8px;
    background: var(--bg);
    border: none;
}
#slider_container input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border: 2px solid var(--text);
    border-radius: 0;
    cursor: pointer;
    transition: border-color 0.2s var(--ease-out-expo);
}
#slider_container input[type="range"]::-moz-range-thumb:hover {
    border-color: var(--secondary);
}
#slider_container input[type="range"]::-ms-track {
    width: 100%;
    height: 8px;
    background: transparent;
    border-color: transparent;
    color: transparent;
}
#slider_container input[type="range"]::-ms-thumb {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border: 2px solid var(--text);
    cursor: pointer;
}
#slider_container input[type="range"]::-ms-fill-lower {
    background: var(--secondary);
    opacity: 0.3;
}
#slider_container input[type="range"]::-ms-fill-upper {
    background: var(--bg);
}

#tooltip {
    position: absolute;
    pointer-events: none;
    opacity: 0;
    background-color: var(--bg);
    color: var(--text);
    padding: 8px 12px;
    border: 2px solid var(--primary);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    line-height: 1.5;
    max-width: 300px;
    z-index: 1000;
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
}
#tooltip strong {
    font-weight: 600;
}
#tooltip .tooltip-gloss {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}
#tooltip .tooltip-gloss-body {
    flex: 1;
    min-width: 0;
}
#tooltip .tooltip-gloss-icon {
    flex-shrink: 0;
    color: var(--accent);
    opacity: 0.95;
}
#tooltip .tooltip-def {
    margin: 0.45em 0 0;
    font-weight: 500;
    line-height: 1.45;
    border-left: 3px solid var(--accent);
    padding-left: 8px;
}
#tooltip .tooltip-metrics {
    margin: 0.5em 0 0;
}
#tooltip .tooltip-hint {
    margin: 0.4em 0 0;
    font-size: 0.68rem;
    opacity: 0.88;
    line-height: 1.4;
}
#tooltip .tooltip-era-count {
    font-weight: 600;
    opacity: 0.9;
}
#tooltip .tooltip-word-lines {
    margin-top: 0.35em;
}
#tooltip .tooltip-word-line + .tooltip-word-line {
    margin-top: 0.35em;
}
#tooltip .tooltip-score {
    font-weight: 600;
    opacity: 0.95;
}
#tooltip .tooltip-sub {
    margin: 0.2em 0 0;
    font-size: 0.68rem;
    opacity: 0.88;
    line-height: 1.35;
}

/* chart h3: what this viz is + how to use (separate from #tooltip used by D3) */
.viz-chart-title {
    cursor: help;
    position: relative;
    display: inline-block;
    max-width: 100%;
    outline: none;
}
.viz-chart-title::after {
    content: attr(data-desc);
    position: absolute;
    top: calc(100% + 10px);
    bottom: auto;
    left: 0;
    width: max-content;
    max-width: min(400px, 94vw);
    padding: 12px 14px;
    background: var(--bg);
    color: var(--text);
    border: 2px solid var(--primary);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.55;
    letter-spacing: 0.01em;
    white-space: normal;
    text-align: left;
    text-transform: none;
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.12);
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 40;
    pointer-events: none;
}
.viz-chart-title:hover::after,
.viz-chart-title:focus-visible::after {
    visibility: visible;
    opacity: 1;
}
.viz-chart-title:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}
@media (prefers-reduced-motion: reduce) {
    .viz-chart-title::after {
        transition: none;
    }
}

#vinyl-wall svg text {
    font-family: var(--font-body);
    font-weight: 600;
}
#vinyl-wall svg #year-text {
    font-size: 14px;
    font-weight: 600;
    fill: var(--text);
}
#vinyl-wall svg .disc_text {
    font-family: var(--font-body);
    font-weight: 600;
    fill: var(--text);
}

#viz-piano svg text {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
    fill: var(--text);
}
#viz-piano .legend-item .piano-legend-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    fill: var(--text);
}
#viz-piano .piano-axis-label {
    font-size: 11px;
    font-weight: 600;
    fill: var(--text);
}

.aha-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}
@media (max-width: 768px) {
    .aha-grid {
        grid-template-columns: 1fr;
    }
}

.formula-block {
    padding: 2.5rem;
    border: var(--border-width) solid var(--accent);
    background: var(--surface);
}
.formula-block .copy {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.6;
}
.formula-block code {
    display: block;
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.35rem);
    color: var(--accent);
    margin: 1rem 0;
    letter-spacing: -0.02em;
    font-weight: 700;
}

.paths-empower {
    margin-bottom: 2rem;
}

.paths-stage {
    position: relative;
    min-height: 280px;
    margin: 3rem 0;
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 10rem;
}

.path-panel {
    position: relative;
    flex: 1;
    max-width: 420px;
    cursor: pointer;
    transition:
        transform 0.25s var(--ease-out-expo),
        z-index 0s;
    z-index: 1;
}

.path-panel:hover {
    z-index: 2;
}

.path-panel-artist {
    transform: rotate(-4deg);
    margin-right: -2rem;
}

.path-panel-explorer {
    transform: rotate(4deg);
    margin-left: -2rem;
}

.path-panel-artist:hover {
    transform: rotate(-1deg);
}

.path-panel-explorer:hover {
    transform: rotate(1deg);
}

.path-panel-inner {
    position: relative;
    height: 100%;
    min-height: 240px;
    padding: 2rem;
    border: var(--border-width) solid var(--text);
    background: var(--surface);
    overflow: hidden;
}

.path-panel-artist .path-panel-inner {
    border-color: var(--primary);
    box-shadow: 8px 8px 0 var(--primary);
}

.path-panel-explorer .path-panel-inner {
    border-color: var(--secondary);
    box-shadow: -8px 8px 0 var(--secondary);
}

.path-panel-artist:hover .path-panel-inner {
    border-color: var(--primary);
    box-shadow: 12px 12px 0 var(--primary);
}

.path-panel-explorer:hover .path-panel-inner {
    border-color: var(--secondary);
    box-shadow: -12px 12px 0 var(--secondary);
}

.path-panel-accent {
    position: absolute;
    top: 0;
    width: 100%;
    height: 6px;
}

.path-panel-artist .path-panel-accent {
    left: 0;
    background: var(--primary);
    clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.path-panel-explorer .path-panel-accent {
    right: 0;
    background: var(--secondary);
    clip-path: polygon(15% 0, 100% 0, 100% 100%, 0 100%);
}

.path-panel-content {
    position: relative;
    z-index: 1;
    padding-top: 0.5rem;
}

.path-panel h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.path-panel p {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.path-panel-artist .path-icon {
    color: var(--primary);
}

.path-panel-explorer .path-icon {
    color: var(--secondary);
}

.path-icon {
    display: inline-block;
    margin-bottom: 1rem;
}

.path-panel:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 4px;
}

@media (max-width: 768px) {
    .paths-stage {
        flex-direction: column;
        align-items: center;
        min-height: auto;
        gap: 2rem;
    }

    .path-panel {
        max-width: 100%;
        margin: 0;
    }

    .path-panel-artist,
    .path-panel-explorer {
        transform: none;
    }

    .path-panel-artist:hover,
    .path-panel-explorer:hover {
        transform: none;
    }

    .path-panel-artist .path-panel-inner {
        box-shadow: 0 8px 0 var(--primary);
    }

    .path-panel-explorer .path-panel-inner {
        box-shadow: 0 8px 0 var(--secondary);
    }

    .path-panel-artist .path-panel-accent {
        clip-path: none;
    }

    .path-panel-explorer .path-panel-accent {
        clip-path: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .path-panel {
        transition: none;
    }

    .path-panel-artist:hover,
    .path-panel-explorer:hover {
        transform: none;
    }
}

.credits {
    padding: 3rem 1.5rem;
    text-align: center;
    border-top: var(--border-width) solid var(--text);
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 4rem;
}

#piano-container {
    overflow: hidden;
    width: 100%;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
#piano-container::-webkit-scrollbar {
    display: none;
}

#viz-scatter,
#viz-formula {
    padding: 0.75rem;
}
#viz-scatter {
    min-height: 640px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#viz-scatter .ga-module {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: stretch;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}

#viz-scatter .ga-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.7rem;
    background: var(--surface);
    border: 2px solid var(--text);
}

#viz-scatter .ga-btn {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text);
    background: var(--bg);
    border: 2px solid var(--text);
    padding: 0.36rem 0.65rem;
    cursor: pointer;
}
#viz-scatter .ga-btn:hover {
    border-color: var(--secondary);
    background: var(--surface);
}
#viz-scatter .ga-btn-play {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

#viz-scatter .ga-year-display {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 700;
    margin-left: 0.2rem;
    min-width: 3ch;
}

#viz-scatter #year-slider {
    width: 120px;
}

#viz-scatter .ga-genre-selector {
    display: block;
    padding: 0.6rem 0.7rem;
    background: var(--bg);
    border: 2px solid var(--text);
}
#viz-scatter .ga-genre-selector.open {
    display: block;
}
#viz-scatter .ga-btn-genres {
    display: none;
}
#viz-scatter .ga-genre-selector p {
    margin: 0 0 0.45rem;
    color: var(--muted);
    font-size: 0.75rem;
}
#viz-scatter .genre-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.38rem;
    margin-bottom: 0.5rem;
}
#viz-scatter .genre-chip {
    border: 2px solid var(--text);
    background: var(--bg);
    color: var(--text);
    padding: 0.2rem 0.55rem;
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
}
#viz-scatter .genre-chip.selected {
    border-color: var(--secondary);
    background: var(--surface);
}
#viz-scatter .ga-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}
#viz-scatter .legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
}
#viz-scatter .legend-label {
    font-weight: 600;
}
#viz-scatter .legend-type {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--muted);
    letter-spacing: 0.02em;
}
#viz-scatter #chart-container {
    overflow-x: auto;
    display: flex;
    justify-content: center;
    padding: 0.5rem 0;
    min-height: 520px;
}
#viz-scatter #chart {
    background: var(--surface);
    border: 2px solid var(--text);
    width: 100%;
    max-width: 960px;
    min-width: 320px;
    height: auto;
    margin: 0 auto;
}
#viz-scatter .staff-line {
    stroke: var(--text);
    stroke-width: 1.05;
}
#viz-scatter .barline {
    stroke: var(--text);
}
#viz-scatter .staff-brace {
    stroke: var(--text);
}
#viz-scatter .year-tick-label {
    fill: var(--muted);
    font-size: 10px;
}
#viz-scatter .playhead {
    stroke: var(--accent);
    stroke-width: 1.2;
    stroke-dasharray: 4 4;
    opacity: 0.8;
}
#viz-scatter .trail {
    fill: none;
    stroke-width: 2.8;
    stroke-opacity: 0.9;
    stroke-dasharray: 6 4;
}
#viz-scatter .genre-right-label {
    font-size: 11px;
}

@media (max-width: 768px) {
    #viz-scatter {
        min-height: 520px;
        padding: 0.5rem;
    }
    #viz-scatter #chart-container {
        min-height: 400px;
    }
}

#viz-formula .tempo-module {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
    width: 100%;
    max-width: 100%;
}
#viz-formula #tempo-controls {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
}
#viz-formula #tempo-controls label {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.58rem 0.65rem;
    background: var(--bg);
    border: 2px solid var(--text);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--muted);
    min-width: 0;
}
#viz-formula #tempo-controls .tempo-select-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: 0.02em;
}
#viz-formula #tempo-controls .tempo-song-picker {
    width: 100%;
    padding: 0.45rem 0.56rem;
    border: 2px solid var(--text);
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
}
#viz-formula #tempo-controls .tempo-song-picker:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 2px var(--secondary);
}
#viz-formula #tempo-controls .tempo-combobox {
    position: relative;
    width: 100%;
}
#viz-formula #tempo-controls .tempo-song-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    margin: 0;
    padding: 0.25rem 0;
    list-style: none;
    border: 2px solid var(--text);
    background: var(--surface);
    max-height: 220px;
    overflow-y: auto;
    display: none;
    z-index: 40;
}
#viz-formula #tempo-controls .tempo-song-list.open {
    display: block;
}
#viz-formula #tempo-controls .tempo-song-list li {
    padding: 0.36rem 0.54rem;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
}
#viz-formula #tempo-controls .tempo-song-list li:hover,
#viz-formula #tempo-controls .tempo-song-list li.active {
    background: var(--bg);
    color: var(--secondary);
}
#viz-formula #tempo-song-info {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
}
#viz-formula #tempo-song-info .tempo-song-card {
    padding: 0.58rem 0.65rem;
    background: var(--bg);
    border: 2px solid var(--text);
    color: var(--text);
}
#viz-formula #tempo-song-info .tempo-song-card h4 {
    margin: 0 0 0.35rem;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--muted);
    letter-spacing: 0.02em;
}
#viz-formula #tempo-song-info .tempo-song-card p {
    margin: 0.1rem 0;
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--muted);
    letter-spacing: 0.02em;
}
#viz-formula #tempo-song-info .tempo-song-card p strong {
    font-weight: 600;
    color: var(--text);
}
#viz-formula #tempo-song-info .tempo-song-card p.empty {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--muted);
    font-style: italic;
    letter-spacing: 0.02em;
}
#viz-formula #tempo-song-info .tempo-song-card .dot {
    width: 9px;
    height: 9px;
    border-radius: 0;
    display: inline-block;
}
#viz-formula #tempo-chart-host {
    overflow-x: auto;
    display: flex;
    justify-content: center;
    margin: 0 auto;
    width: 100%;
}
#viz-formula #tempo-chart-host svg {
    border: 2px solid var(--text);
    background: var(--bg);
    width: 100%;
    min-width: 320px;
    max-width: 960px;
}
#viz-formula #tempo-chart-host svg text {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
}
#viz-formula #tempo-chart-host svg .tempo-axis-label {
    font-size: 13px;
    font-weight: 600;
    fill: var(--muted);
}
#viz-formula .ecg-line-core {
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.3));
}
#viz-formula .ecg-line-glow {
    filter: blur(2.2px);
}

@media (max-width: 768px) {
    #viz-formula #tempo-controls {
        grid-template-columns: 1fr;
    }
    #viz-formula #tempo-song-info {
        grid-template-columns: 1fr;
    }
    #viz-formula #tempo-chart-host svg {
        min-width: 280px;
    }
}

.page-nav,
.deck-nav {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 100;
    padding: 0.5rem 1rem;
    border: var(--border-width) solid var(--text);
    background: var(--surface);
}
.nav-btn {
    background: var(--bg);
    border: 2px solid var(--text);
    color: var(--text);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.nav-btn:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}
.nav-btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}
.nav-progress {
    display: flex;
    gap: 0.25rem;
}
.nav-dot {
    width: 12px;
    height: 12px;
    border: 2px solid var(--text);
    background: var(--bg);
    cursor: pointer;
}
.nav-dot:hover {
    border-color: var(--secondary);
    background: var(--surface);
}
.nav-dot.active {
    background: var(--accent);
    border-color: var(--accent);
}
.nav-dot:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

@media (max-width: 768px) {
    .page-nav,
    .deck-nav {
        bottom: 0.75rem;
        padding: 0.75rem;
    }
    .slide-inner {
        max-width: 100%;
    }
}

@media (min-width: 375px) and (max-width: 767px) {
    .hero-title {
        font-size: clamp(3rem, 10vw, 6rem);
    }
    .hero-phone-mockup {
        width: 280px;
        margin: 0 auto;
        transform: none;
    }
    .hero-phone-mockup:hover {
        transform: none;
    }
    .phone-frame {
        border-radius: 38px;
        padding: 10px;
    }
    .phone-notch {
        width: 72px;
        height: 22px;
        top: 12px;
    }
    .phone-btn-vol-up {
        top: 72px;
    }
    .phone-btn-vol-down {
        top: 112px;
    }
    .phone-btn-power {
        top: 118px;
    }
    .phone-screen {
        min-height: 380px;
        margin-top: 26px;
    }
    .billboard-list {
        max-height: 280px;
    }
    .hero-visual {
        justify-content: center;
    }
}

@media (min-width: 768px) {
    .hero-inner-wrap {
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 3rem;
        align-items: center;
    }
    .hero-visual {
        margin-top: 0;
        justify-content: flex-end;
    }
}

#section-0 .hero-inner-wrap {
    padding-right: 2rem;
}