:root {
    --spacingHorizontalNone: 0;
    --spacingHorizontalXXS: 2px;
    --spacingHorizontalXS: 4px;
    --spacingHorizontalSNudge: 6px;
    --spacingHorizontalS: 8px;
    --spacingHorizontalMNudge: 10px;
    --spacingHorizontalM: 12px;
    --spacingHorizontalL: 16px;
    --spacingHorizontalXL: 20px;
    --spacingHorizontalXXL: 24px;
    --spacingHorizontalXXXL: 32px;

    --spacingVerticalNone: 0;
    --spacingVerticalXXS: 2px;
    --spacingVerticalXS: 4px;
    --spacingVerticalSNudge: 6px;
    --spacingVerticalS: 8px;
    --spacingVerticalMNudge: 10px;
    --spacingVerticalM: 12px;
    --spacingVerticalL: 16px;
    --spacingVerticalXL: 20px;
    --spacingVerticalXXL: 24px;
    --spacingVerticalXXXL: 32px;

    --borderRadiusNone: 0;
    --borderRadiusSmall: 2px;
    --borderRadiusMedium: 4px;
    --borderRadiusLarge: 6px;
    --borderRadiusXLarge: 8px;
    --borderRadius2XLarge: 12px;
    --borderRadius3XLarge: 16px;
    --borderRadiusCircular: 10000px;

    --strokeWidthThin: 1px;
    --strokeWidthThick: 2px;
    --strokeWidthThicker: 3px;
    --strokeWidthThickest: 4px;

    --fontFamilyBase: 'Segoe UI', 'Segoe UI Web (West European)', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --fontFamilyMonospace: Consolas, 'Courier New', Courier, monospace;

    --fontSizeBase100: 10px;
    --fontSizeBase200: 12px;
    --fontSizeBase300: 14px;
    --fontSizeBase400: 16px;
    --fontSizeBase500: 20px;
    --fontSizeBase600: 24px;
    --fontSizeHero700: 28px;
    --fontSizeHero800: 32px;
    --fontSizeHero900: 40px;
    --fontSizeHero1000: 64px;

    --fontWeightRegular: 400;
    --fontWeightMedium: 500;
    --fontWeightSemibold: 600;
    --fontWeightBold: 700;

    --lineHeightBase100: 14px;
    --lineHeightBase200: 16px;
    --lineHeightBase300: 20px;
    --lineHeightBase400: 22px;
    --lineHeightBase500: 28px;
    --lineHeightBase600: 32px;
    --lineHeightHero700: 36px;
    --lineHeightHero800: 40px;
    --lineHeightHero900: 52px;
    --lineHeightHero1000: 84px;

    --durationUltraFast: 50ms;
    --durationFaster: 100ms;
    --durationFast: 150ms;
    --durationNormal: 200ms;
    --durationGentle: 250ms;
    --durationSlow: 300ms;

    --curveAccelerateMax: cubic-bezier(0.9, 0.1, 1, 0.2);
    --curveDecelerateMax: cubic-bezier(0.1, 0.9, 0.2, 1);
    --curveEasyEase: cubic-bezier(0.33, 0, 0.67, 1);
    --curveLinear: linear;

    --shadow2: 0 0 2px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.14);
    --shadow4: 0 0 2px rgba(0, 0, 0, 0.12), 0 2px 4px rgba(0, 0, 0, 0.14);
    --shadow8: 0 0 2px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.14);
    --shadow16: 0 0 2px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.14);
    --shadow28: 0 0 8px rgba(0, 0, 0, 0.12), 0 14px 28px rgba(0, 0, 0, 0.14);

    --colorNeutralBackground1: #ffffff;
    --colorNeutralBackground1Hover: #fafafa;
    --colorNeutralBackground1Pressed: #f5f5f5;
    --colorNeutralBackground2: #f8f8f8;
    --colorNeutralBackground3: #f0f0f0;
    --colorNeutralBackground4: #e6e6e6;
    --colorSubtleBackgroundHover: rgba(0, 0, 0, 0.04);
    --colorSubtleBackgroundPressed: rgba(0, 0, 0, 0.08);

    --colorNeutralForeground1: #242424;
    --colorNeutralForeground2: #424242;
    --colorNeutralForeground3: #616161;
    --colorNeutralForeground4: #707070;
    --colorNeutralForegroundDisabled: #bdbdbd;
    --colorNeutralForegroundOnBrand: #ffffff;

    --colorNeutralStroke1: rgba(0, 0, 0, 0.12);
    --colorNeutralStroke2: rgba(0, 0, 0, 0.18);
    --colorNeutralStrokeSubtle: rgba(0, 0, 0, 0.06);
    --colorNeutralStrokeAccessible: #707070;

    --colorBrandBackground: #d13438;
    --colorBrandBackgroundHover: #ba2f33;
    --colorBrandBackgroundPressed: #a4292d;
    --colorBrandBackgroundSelected: #8e2427;
    --colorBrandForeground1: #d13438;
    --colorCompoundBrandStroke: #d13438;
    --colorCompoundBrandStrokeHover: #ba2f33;
    --colorCompoundBrandStrokePressed: #a4292d;
    --colorCompoundBrandBackground: #d13438;
    --colorBrandBackground2: rgba(209, 52, 56, 0.08);

    --f2-acrylic-surface: var(--colorNeutralBackground1);
    --f2-acrylic-border: var(--colorNeutralStroke1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--fontFamilyBase);
    font-size: var(--fontSizeBase300);
    line-height: var(--lineHeightBase300);
    color: var(--colorNeutralForeground1);
    background-color: var(--colorNeutralBackground2);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

#sky-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    display: block;
    pointer-events: none;
}

.f2-acrylic-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.72) 0%, rgba(248, 248, 248, 0.50) 58%, rgba(248, 248, 248, 0.78) 100%);
    pointer-events: none;
}

.f2-app-header {
    position: sticky;
    top: 0;
    z-index: 999;
    width: 100%;
    background: var(--colorNeutralBackground1);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    box-shadow: var(--shadow2);
}

.f2-reading-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: var(--strokeWidthThick);
    width: 0%;
    background: var(--colorBrandBackground);
    transition: width var(--durationFaster) var(--curveLinear);
}

.f2-header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacingHorizontalXXL);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacingHorizontalXL);
}

.f2-brand {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
    text-decoration: none;
    color: var(--colorNeutralForeground1);
    flex-shrink: 0;
}

.f2-brand-badge {
    width: 32px;
    height: 32px;
    border-radius: var(--borderRadiusMedium);
    background: var(--colorBrandBackground);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--colorNeutralForegroundOnBrand);
    box-shadow: var(--shadow2);
}

.f2-brand-icon {
    width: 18px;
    height: 18px;
}

.f2-brand-text {
    display: flex;
    flex-direction: column;
}

.f2-brand-title {
    font-size: var(--fontSizeBase400);
    font-weight: var(--fontWeightBold);
    line-height: var(--lineHeightBase400);
    color: var(--colorBrandBackground);
    letter-spacing: -0.01em;
}

.f2-brand-caption {
    font-size: var(--fontSizeBase100);
    line-height: var(--lineHeightBase100);
    color: var(--colorNeutralForeground3);
}

.f2-tablist {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--spacingHorizontalXS);
}

.f2-tab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 0 var(--spacingHorizontalM);
    font-size: var(--fontSizeBase300);
    font-weight: var(--fontWeightRegular);
    color: var(--colorNeutralForeground2);
    text-decoration: none;
    position: relative;
    transition: color var(--durationFast) var(--curveEasyEase);
}

.f2-tab:hover {
    color: var(--colorNeutralForeground1);
    background: var(--colorSubtleBackgroundHover);
}

.f2-tab:focus-visible {
    outline: var(--strokeWidthThick) solid var(--colorCompoundBrandStroke);
    outline-offset: -2px;
    border-radius: var(--borderRadiusMedium);
}

.f2-tab.active {
    color: var(--colorNeutralForeground1);
    font-weight: var(--fontWeightSemibold);
}

.f2-tab.active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: var(--spacingHorizontalM);
    right: var(--spacingHorizontalM);
    height: var(--strokeWidthThick);
    background: var(--colorCompoundBrandStroke);
    border-radius: var(--borderRadiusCircular);
}

.f2-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
    flex-shrink: 0;
}

.f2-btn {
    font-family: var(--fontFamilyBase);
    font-size: var(--fontSizeBase300);
    font-weight: var(--fontWeightSemibold);
    line-height: var(--lineHeightBase300);
    border-radius: var(--borderRadiusMedium);
    border: var(--strokeWidthThin) solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacingHorizontalS);
    padding: var(--spacingVerticalSNudge) var(--spacingHorizontalM);
    transition: all var(--durationFast) var(--curveEasyEase);
    text-decoration: none;
    white-space: nowrap;
    background: transparent;
}

.f2-btn:focus-visible {
    outline: var(--strokeWidthThick) solid var(--colorCompoundBrandStroke);
    outline-offset: 2px;
}

.f2-btn-primary {
    background: var(--colorBrandBackground);
    color: var(--colorNeutralForegroundOnBrand);
    box-shadow: none;
}

.f2-btn-primary:hover {
    background: var(--colorBrandBackgroundHover);
    box-shadow: var(--shadow2);
}

.f2-btn-primary:active {
    background: var(--colorBrandBackgroundPressed);
    box-shadow: none;
    transform: translateY(1px);
}

.f2-btn-secondary {
    background: var(--colorNeutralBackground1);
    border-color: var(--colorNeutralStroke1);
    color: var(--colorNeutralForeground1);
    box-shadow: none;
}

.f2-btn-secondary:hover {
    background: var(--colorNeutralBackground1Hover);
    border-color: var(--colorNeutralStroke2);
    box-shadow: var(--shadow2);
}

.f2-btn-secondary:active {
    background: var(--colorNeutralBackground1Pressed);
    box-shadow: none;
    transform: translateY(1px);
}

.f2-btn-subtle {
    color: var(--colorNeutralForeground2);
}

.f2-btn-subtle:hover {
    background: var(--colorSubtleBackgroundHover);
    color: var(--colorNeutralForeground1);
}

.f2-btn-subtle:active {
    background: var(--colorSubtleBackgroundPressed);
}

.f2-btn-small {
    padding: var(--spacingVerticalXXS) var(--spacingHorizontalS);
    font-size: var(--fontSizeBase200);
    line-height: var(--lineHeightBase200);
}

.f2-btn-icon-only {
    padding: var(--spacingVerticalS);
    border-radius: var(--borderRadiusMedium);
}

.f2-status-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--borderRadiusCircular);
    background: var(--colorNeutralForeground4);
    transition: background var(--durationFast) var(--curveEasyEase);
}

body:not(.spoilers-hidden) .f2-status-dot {
    background: var(--colorBrandBackground);
}

.f2-drawer-toggle {
    display: none;
}

.f2-mobile-drawer {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    width: 100vw;
    background: var(--colorNeutralBackground1);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    padding: var(--spacingVerticalL) var(--spacingHorizontalXL);
    z-index: 998;
    flex-direction: column;
    gap: var(--spacingVerticalM);
    box-shadow: var(--shadow16);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--durationSlow) var(--curveDecelerateMax);
}

.f2-mobile-drawer.open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.f2-drawer-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXS);
}

.f2-drawer-link {
    font-size: var(--fontSizeBase400);
    font-weight: var(--fontWeightSemibold);
    color: var(--colorNeutralForeground1);
    text-decoration: none;
    padding: var(--spacingVerticalS) var(--spacingHorizontalM);
    border-radius: var(--borderRadiusMedium);
    transition: background var(--durationFast) var(--curveEasyEase);
}

.f2-drawer-link:hover {
    background: var(--colorBrandBackground2);
    color: var(--colorBrandForeground1);
}

.f2-page-shell {
    max-width: 1400px;
    margin: var(--spacingVerticalXXL) auto 8rem auto;
    padding: 0 var(--spacingHorizontalXXL);
}

.f2-content-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXXL);
}

.f2-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalL);
    scroll-margin-top: 72px;
}

.f2-section-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXS);
    padding: var(--spacingVerticalL) var(--spacingHorizontalXXL);
    background: var(--f2-acrylic-surface);
    border: var(--strokeWidthThin) solid var(--f2-acrylic-border);
    border-radius: var(--borderRadiusXLarge);
    box-shadow: var(--shadow2);
}

.f2-section-eyebrow {
    font-size: var(--fontSizeBase200);
    font-weight: var(--fontWeightBold);
    letter-spacing: 0.1em;
    color: var(--colorBrandBackground);
}

.f2-section-title {
    font-size: var(--fontSizeHero800);
    font-weight: var(--fontWeightBold);
    line-height: var(--lineHeightHero800);
    color: var(--colorNeutralForeground1);
    letter-spacing: -0.01em;
}

.f2-section-desc {
    font-size: var(--fontSizeBase300);
    color: var(--colorNeutralForeground3);
}

.f2-card {
    background: var(--colorNeutralBackground1);
    border: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    border-radius: var(--borderRadiusXLarge);
    box-shadow: var(--shadow2);
    padding: var(--spacingVerticalXXL);
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalM);
    transition: background-color var(--durationNormal) var(--curveEasyEase), border-color var(--durationNormal) var(--curveEasyEase), box-shadow var(--durationNormal) var(--curveEasyEase), transform var(--durationNormal) var(--curveEasyEase);
}

.f2-card:hover {
    box-shadow: var(--shadow8);
    background: var(--colorNeutralBackground1Hover);
    border-color: var(--colorNeutralStroke2);
    transform: translateY(-1px);
}

.f2-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.f2-hero-card {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    padding: 0;
    overflow: hidden;
    min-height: 520px;
}

.f2-hero-card:hover {
    transform: none;
}

.f2-hero-body {
    padding: var(--spacingVerticalXXXL) var(--spacingHorizontalXXXL);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--spacingVerticalL);
}

.f2-tag-row {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
    flex-wrap: wrap;
}

.f2-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacingHorizontalXS);
    padding: var(--spacingVerticalXXS) var(--spacingHorizontalS);
    border-radius: var(--borderRadiusCircular);
    font-size: var(--fontSizeBase200);
    font-weight: var(--fontWeightSemibold);
    line-height: var(--lineHeightBase200);
    background: var(--colorNeutralBackground3);
    color: var(--colorNeutralForeground1);
    border: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
}

.f2-badge-brand {
    background: var(--colorBrandBackground2);
    color: var(--colorBrandBackground);
    border-color: rgba(209, 52, 56, 0.2);
}

.f2-badge-large {
    padding: var(--spacingVerticalXS) var(--spacingHorizontalM);
    font-size: var(--fontSizeBase300);
}

.f2-badge-icon {
    width: 14px;
    height: 14px;
}

.f2-hero-title-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXS);
}

.f2-title-display {
    font-size: var(--fontSizeHero900);
    font-weight: var(--fontWeightBold);
    line-height: var(--lineHeightHero900);
    color: var(--colorNeutralForeground1);
    display: flex;
    align-items: baseline;
    gap: var(--spacingHorizontalM);
    letter-spacing: -0.02em;
}

.f2-title-furigana {
    font-size: var(--fontSizeBase400);
    font-weight: var(--fontWeightMedium);
    color: var(--colorBrandBackground);
}

.f2-title-sub {
    font-size: var(--fontSizeBase300);
    font-weight: var(--fontWeightBold);
    letter-spacing: 0.15em;
    color: var(--colorNeutralForeground3);
}

.f2-quote-panel {
    background: var(--colorNeutralBackground1);
    border-left: var(--strokeWidthThicker) solid var(--colorBrandBackground);
    padding: var(--spacingVerticalM) var(--spacingHorizontalL);
    border-radius: 0 var(--borderRadiusMedium) var(--borderRadiusMedium) 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
    box-shadow: var(--shadow2);
}

.f2-quote-original {
    font-size: var(--fontSizeBase400);
    font-weight: var(--fontWeightSemibold);
    line-height: var(--lineHeightBase400);
    color: var(--colorNeutralForeground1);
}

.f2-quote-translation {
    font-size: var(--fontSizeBase300);
    color: var(--colorNeutralForeground2);
}

.f2-metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacingVerticalS) var(--spacingHorizontalXL);
}

.f2-metric-cell {
    display: flex;
    align-items: baseline;
    gap: var(--spacingHorizontalS);
}

.f2-caption {
    font-size: var(--fontSizeBase200);
    line-height: var(--lineHeightBase200);
    color: var(--colorNeutralForeground3);
    font-weight: var(--fontWeightRegular);
}

.f2-caption-strong {
    font-size: var(--fontSizeBase200);
    line-height: var(--lineHeightBase200);
    font-weight: var(--fontWeightBold);
    letter-spacing: 0.05em;
}

.f2-body {
    font-size: var(--fontSizeBase300);
    line-height: var(--lineHeightBase300);
    color: var(--colorNeutralForeground2);
}

.f2-body-strong {
    font-size: var(--fontSizeBase300);
    line-height: var(--lineHeightBase300);
    font-weight: var(--fontWeightSemibold);
    color: var(--colorNeutralForeground1);
}

.f2-subtitle {
    font-size: var(--fontSizeBase500);
    font-weight: var(--fontWeightSemibold);
    line-height: var(--lineHeightBase500);
    color: var(--colorNeutralForeground1);
}

.f2-text-brand {
    color: var(--colorBrandBackground);
}

.f2-hero-action-bar {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalM);
    flex-wrap: wrap;
}

.f2-tachie-showcase-panel {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacingVerticalXXL);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(209, 52, 56, 0.06) 100%);
    border-left: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    overflow: hidden;
}

.f2-tachie-halo {
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: var(--borderRadiusCircular);
    background: radial-gradient(circle, rgba(209, 52, 56, 0.15) 0%, rgba(209, 52, 56, 0) 70%);
    filter: blur(40px);
    pointer-events: none;
}

.f2-tachie-watermark {
    position: absolute;
    font-size: 14rem;
    font-weight: var(--fontWeightBold);
    color: rgba(209, 52, 56, 0.04);
    user-select: none;
    pointer-events: none;
    line-height: 1;
}

.f2-tachie-slot {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    width: 100%;
    height: 100%;
    min-height: 440px;
}

.f2-tachie-image {
    max-height: 480px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 12px 20px rgba(0, 0, 0, 0.2));
}

.f2-tachie-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacingVerticalM);
    width: 100%;
    padding: var(--spacingVerticalXL) var(--spacingHorizontalM);
}

.f2-silhouette-box {
    width: 120px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(209, 52, 56, 0.45);
}

.f2-silhouette-svg {
    width: 100%;
    height: 100%;
}

.f2-pedestal {
    width: 75%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacingVerticalXS);
    margin-top: var(--spacingVerticalM);
}

.f2-pedestal-line {
    width: 100%;
    height: var(--strokeWidthThin);
    background: radial-gradient(circle, var(--colorBrandBackground) 0%, transparent 100%);
}

.f2-pedestal-label {
    font-size: var(--fontSizeBase100);
    letter-spacing: 0.2em;
    color: var(--colorNeutralForeground3);
    font-weight: var(--fontWeightBold);
}

.f2-bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacingVerticalL);
}

.f2-card-feature {
    grid-column: span 2;
}

.f2-property-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalS);
}

.f2-property-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding-bottom: var(--spacingVerticalXS);
    border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStrokeSubtle);
}

.f2-grid-2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacingVerticalL);
}

.f2-grid-4col {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacingVerticalL);
}

.f2-item-box {
    background: var(--colorNeutralBackground2);
    border: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    border-radius: var(--borderRadiusMedium);
    padding: var(--spacingVerticalM);
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
}

.f2-numbered-card {
    position: relative;
    overflow: hidden;
}

.f2-numbered-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--strokeWidthThicker);
    background: var(--colorBrandBackground);
    opacity: 0;
    transition: opacity var(--durationFast) var(--curveEasyEase);
}

.f2-numbered-card:hover::before {
    opacity: 1;
}

.f2-card-index {
    font-size: var(--fontSizeHero700);
    font-weight: var(--fontWeightBold);
    line-height: 1;
    color: var(--colorBrandBackground);
    opacity: 0.35;
}

.f2-timeline-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalM);
}

.f2-timeline-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacingHorizontalXL);
    align-items: center;
}

.f2-timeline-num {
    font-size: var(--fontSizeHero800);
    font-weight: var(--fontWeightBold);
    color: var(--colorBrandBackground);
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: var(--strokeWidthThin) solid var(--colorNeutralStroke2);
    padding-right: var(--spacingHorizontalL);
}

.f2-timeline-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXS);
}

.f2-spoiler-banner {
    display: none;
    align-items: center;
    justify-content: space-between;
    background: var(--colorNeutralBackground2);
    border: var(--strokeWidthThin) dashed var(--colorBrandBackground);
    padding: var(--spacingVerticalS) var(--spacingHorizontalM);
    border-radius: var(--borderRadiusMedium);
    margin-bottom: var(--spacingVerticalXS);
}

body.spoilers-hidden .spoiler-block .f2-subtitle,
body.spoilers-hidden .spoiler-block .f2-body,
body.spoilers-hidden .spoiler-block .f2-caption-strong {
    filter: blur(6px);
    user-select: none;
    pointer-events: none;
    opacity: 0.3;
}

body.spoilers-hidden .spoiler-block .f2-spoiler-banner {
    display: flex;
    position: relative;
    z-index: 10;
}

.f2-track-card {
    display: grid;
    grid-template-columns: 36px 1fr auto;
    align-items: center;
    gap: var(--spacingHorizontalM);
    padding: var(--spacingVerticalL);
}

.f2-track-num {
    font-size: var(--fontSizeHero700);
    font-weight: var(--fontWeightBold);
    color: var(--colorBrandBackground);
    line-height: 1;
}

.f2-track-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
}

.f2-track-title-row {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
}

.f2-quote-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalM);
}

.f2-divider {
    width: 32px;
    height: var(--strokeWidthThick);
    background: var(--colorBrandBackground);
    border-radius: var(--borderRadiusCircular);
}

.f2-quote-source {
    margin-top: auto;
    font-weight: var(--fontWeightSemibold);
}

.f2-sources-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalM);
}

.f2-source-row {
    display: flex;
    align-items: baseline;
    gap: var(--spacingHorizontalL);
    padding-bottom: var(--spacingVerticalS);
    border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStrokeSubtle);
}

.f2-source-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.f2-source-index {
    font-size: var(--fontSizeBase500);
    font-weight: var(--fontWeightBold);
    color: var(--colorBrandBackground);
}

.f2-source-detail {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
}

.f2-app-footer {
    border-top: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    background: var(--colorNeutralBackground1);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    padding: var(--spacingVerticalXXXL) var(--spacingHorizontalXXL) 6rem var(--spacingHorizontalXXL);
}

.f2-footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacingVerticalS);
    text-align: center;
}

.f2-footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
}

.f2-docked-audio-bar {
    position: fixed;
    bottom: var(--spacingVerticalXL);
    right: var(--spacingHorizontalXXL);
    z-index: 1000;
    background: var(--colorNeutralBackground1);
    border: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    border-radius: var(--borderRadiusXLarge);
    box-shadow: var(--shadow16);
    width: 420px;
    max-width: calc(100vw - 3rem);
    transition: all var(--durationNormal) var(--curveEasyEase);
}

.f2-audio-surface {
    padding: var(--spacingVerticalM) var(--spacingHorizontalL);
    display: grid;
    grid-template-columns: 48px 1fr auto;
    align-items: center;
    gap: var(--spacingHorizontalM);
}

.f2-vinyl-wrap {
    width: 48px;
    height: 48px;
    border-radius: var(--borderRadiusCircular);
    position: relative;
    box-shadow: var(--shadow4);
    overflow: hidden;
}

.f2-vinyl-disc {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--borderRadiusCircular);
    animation: vinylSpin 14s linear infinite;
    animation-play-state: paused;
}

body.audio-playing .f2-vinyl-disc {
    animation-play-state: running;
}

@keyframes vinylSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.f2-vinyl-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: #ffffff;
    border: var(--strokeWidthThick) solid var(--colorBrandBackground);
    border-radius: var(--borderRadiusCircular);
}

.f2-track-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
    overflow: hidden;
}

.f2-track-title {
    font-size: var(--fontSizeBase300);
    font-weight: var(--fontWeightSemibold);
    line-height: var(--lineHeightBase300);
    color: var(--colorNeutralForeground1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.f2-track-artist {
    font-size: var(--fontSizeBase200);
    line-height: var(--lineHeightBase200);
    color: var(--colorNeutralForeground3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.f2-slider-row {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalS);
    margin-top: var(--spacingVerticalXXS);
}

.f2-slider-time {
    font-size: var(--fontSizeBase100);
    color: var(--colorNeutralForeground3);
    font-variant-numeric: tabular-nums;
}

.f2-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: var(--strokeWidthThick);
    border-radius: var(--borderRadiusCircular);
    background: var(--colorNeutralStroke2);
    outline: none;
    cursor: pointer;
}

.f2-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    border-radius: var(--borderRadiusCircular);
    background: var(--colorBrandBackground);
    cursor: pointer;
    box-shadow: var(--shadow2);
    transition: transform var(--durationFast) var(--curveEasyEase);
}

.f2-slider::-webkit-slider-thumb:hover {
    transform: scale(1.3);
}

.f2-audio-controls {
    display: flex;
    align-items: center;
    gap: var(--spacingHorizontalXS);
}

.f2-btn-play {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: var(--borderRadiusCircular);
}

.pause-svg {
    display: none;
}

body.audio-playing .play-svg {
    display: none;
}

body.audio-playing .pause-svg {
    display: block;
}

.f2-playlist-drawer {
    display: none;
    max-height: 260px;
    overflow-y: auto;
    border-top: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    padding: var(--spacingVerticalM) var(--spacingHorizontalL);
    background: var(--colorNeutralBackground1);
    border-radius: 0 0 var(--borderRadiusXLarge) var(--borderRadiusXLarge);
}

.f2-playlist-drawer.open {
    display: block;
}

.f2-drawer-title-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding-bottom: var(--spacingVerticalXS);
    border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStrokeSubtle);
    margin-bottom: var(--spacingVerticalS);
}

.f2-playlist-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacingVerticalXXS);
}

.np-song-item {
    display: grid;
    grid-template-columns: 24px 1fr auto;
    align-items: center;
    gap: var(--spacingHorizontalS);
    padding: var(--spacingVerticalXS) var(--spacingHorizontalS);
    border-radius: var(--borderRadiusMedium);
    font-size: var(--fontSizeBase200);
    cursor: pointer;
    transition: all var(--durationFast) var(--curveEasyEase);
}

.np-song-item:hover {
    background: var(--colorSubtleBackgroundHover);
}

.np-song-item.active {
    background: var(--colorBrandBackground2);
    font-weight: var(--fontWeightSemibold);
    color: var(--colorBrandBackground);
}

.np-song-item .idx {
    color: var(--colorNeutralForeground4);
}

.np-song-item .nm {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.np-song-item .ar {
    color: var(--colorNeutralForeground3);
}

.f2-scroll-top-btn {
    position: fixed;
    bottom: var(--spacingVerticalXL);
    left: var(--spacingHorizontalXXL);
    z-index: 1000;
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--borderRadiusCircular);
    box-shadow: var(--shadow4);
    opacity: 0;
    pointer-events: none;
    transition: all var(--durationNormal) var(--curveEasyEase);
}

.f2-scroll-top-btn:hover {
    box-shadow: var(--shadow8);
    transform: translateY(-2px);
}

@media (max-width: 1200px) {
    .f2-hero-card {
        grid-template-columns: 1fr;
    }
    .f2-hero-body {
        padding: var(--spacingVerticalXXL);
    }
    .f2-tachie-showcase-panel {
        min-height: 400px;
        border-left: none;
        border-top: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
    }
    .f2-bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .f2-card-feature {
        grid-column: span 2;
    }
    .f2-grid-4col {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .f2-header-container {
        padding: 0 var(--spacingHorizontalM);
        height: 52px;
    }
    .f2-tablist {
        display: none;
    }
    .f2-drawer-toggle {
        display: inline-flex;
    }
    .f2-btn {
        padding: var(--spacingVerticalXXS) var(--spacingHorizontalS);
        font-size: var(--fontSizeBase200);
    }
    .f2-page-shell {
        margin: var(--spacingVerticalM) auto 6rem auto;
        padding: 0 var(--spacingHorizontalM);
    }
    .f2-content-area {
        gap: var(--spacingVerticalXL);
    }
    .f2-hero-body {
        padding: var(--spacingVerticalL) var(--spacingHorizontalM);
    }
    .f2-title-display {
        font-size: var(--fontSizeHero700);
        flex-direction: column;
        gap: var(--spacingVerticalXXS);
    }
    .f2-metrics-grid {
        grid-template-columns: 1fr;
        gap: var(--spacingVerticalXS);
    }
    .f2-section-header {
        padding: var(--spacingVerticalM) var(--spacingHorizontalM);
    }
    .f2-section-title {
        font-size: var(--fontSizeHero700);
        line-height: var(--lineHeightHero700);
    }
    .f2-bento-grid {
        grid-template-columns: 1fr;
    }
    .f2-card-feature {
        grid-column: span 1;
    }
    .f2-grid-4col {
        grid-template-columns: 1fr;
    }
    .f2-grid-2col {
        grid-template-columns: 1fr;
    }
    .f2-timeline-item {
        grid-template-columns: 1fr;
        gap: var(--spacingVerticalS);
    }
    .f2-timeline-num {
        border-right: none;
        border-bottom: var(--strokeWidthThin) solid var(--colorNeutralStroke1);
        padding-right: 0;
        padding-bottom: var(--spacingVerticalXS);
        justify-content: flex-start;
    }
    .f2-docked-audio-bar {
        bottom: var(--spacingVerticalM);
        right: var(--spacingHorizontalM);
        left: var(--spacingHorizontalM);
        width: auto;
        max-width: none;
    }
    .f2-scroll-top-btn {
        display: none;
    }
}


.f2-brand:focus-visible,
.f2-tab:focus-visible,
.f2-drawer-link:focus-visible,
.f2-scroll-top-btn:focus-visible {
    outline: var(--strokeWidthThick) solid var(--colorCompoundBrandStroke);
    outline-offset: 2px;
}

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

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}