#introduction {
    --blue: #f5a200;
    --hairline: rgba(255, 255, 255, 0.16);
    --muted: rgba(255, 255, 255, 0.58);
    --paper: rgba(255, 255, 255, 0.9);
    background: #050607;
    min-height: 100vh;
}

/* 2026.07 art-direction update */
body {
    background: #000;
}

#introduction {
    --hairline: rgba(255, 255, 255, 0.72);
    --muted: rgba(255, 255, 255, 0.74);
    --paper: #fff;
    background: #191919;
    color: #fff;
    font-family: 'Hiragino Kaku Gothic ProN', 'ヒラギノ角ゴ ProN W4', 'Yu Gothic', YuGothic, Meiryo, sans-serif;
    margin: 0 auto;
    max-width: 760px;
}

#introduction .container {
    max-width: 760px;
}

#introduction .hero {
    min-height: 458px;
}

#introduction .hero-copy {
    left: 48px;
    max-width: 640px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.88), 0 1px 2px #000;
}

#introduction .hero h1,
#introduction .hero h1.hero-quote {
    font-size: 29px;
    line-height: 1.45;
    margin-bottom: 14px;
}

#introduction .hero h1 em {
    text-decoration: none;
}

#introduction .hero h1 cite {
    color: #fff;
    font-size: 0.58em;
    margin-top: 6px;
}

#introduction .hero .lead {
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.75;
    max-width: 620px;
}

#introduction main {
    padding: 0 48px 72px;
}

#introduction .chapter,
#introduction .diagram-section,
#introduction .equipment-section,
#introduction .periods-section,
#introduction .philosophy {
    border-top: 0;
    padding: 45px 0 58px;
}

#introduction .periods-section,
#introduction .diagram-section,
#introduction .equipment-section,
#introduction .chapter {
    display: block;
}

#introduction .chapter-head {
    margin-bottom: 28px;
}

#introduction .chapter-head .section-label {
    margin-bottom: 15px;
}

#introduction .chapter-head h2,
#introduction .cc500-copy h2 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.5;
}

#introduction .period-grid {
    margin-top: 18px;
}

#introduction .period-grid li {
    min-height: 192px;
    padding: 0 10px 8px;
}

#introduction .period-grid time {
    font-size: 15px;
    font-weight: 600;
}

#introduction .period-grid h3 {
    font-size: 12px;
    margin: 16px 0 12px;
}

#introduction .period-grid .period-copy {
    color: #fff;
    font-size: 10px;
    line-height: 1.7;
}

#introduction .diagram-gallery {
    margin: 30px auto 0;
    width: 84%;
}

#introduction .process-strip {
    margin-top: 34px;
}

#introduction .process-strip li {
    min-height: 198px;
    padding: 10px 11px 18px;
}

#introduction .process-strip b,
#introduction .equipment-grid section > b {
    color: var(--blue);
}

#introduction .process-strip em {
    color: rgba(255, 255, 255, 0.76);
}

#introduction .collaboration .chapter-body {
    display: block;
}

#introduction .collaboration .large-copy {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 12px;
}

#introduction .chapter-body > p,
#introduction .cc500-copy > p:last-child {
    color: #fff;
    font-size: 12px;
    line-height: 1.9;
}

#introduction .cc500-feature {
    background: #191919;
    display: flex;
    flex-direction: column;
    margin: 0;
}

#introduction .cc500-feature figure {
    margin: 30px auto 0;
    min-height: 0;
    order: 2;
    width: 82%;
}

#introduction .cc500-feature figure img {
    height: auto;
}

#introduction .cc500-copy {
    order: 1;
    padding: 28px 0 0;
}

#introduction .cc500-copy h2 {
    margin-bottom: 18px;
}

#introduction .equipment-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 30px;
}

#introduction .equipment-grid section {
    min-height: 196px;
    padding: 18px 12px;
}

#introduction .equipment-grid h3 {
    font-size: 13px;
    margin: 10px 0 7px;
}

#introduction .equipment-grid p,
#introduction .equipment-note {
    color: #fff;
    font-size: 10px;
    line-height: 1.72;
}

#introduction .equipment-note {
    border-left-color: rgba(245, 162, 0, 0.72);
    grid-column: 1 / -1;
    margin-top: 20px;
}

#introduction .studio-panorama {
    margin: 28px auto 48px;
    width: 82%;
}

#introduction .philosophy {
    padding-top: 18px;
}

#introduction .philosophy-head {
    display: block;
}

#introduction .philosophy-head .section-label {
    margin-bottom: 22px;
}

#introduction .philosophy-head h2 {
    font-size: 20px;
    font-weight: 600;
}

#introduction .philosophy-essay {
    column-gap: 28px;
}

#introduction .philosophy-essay p {
    color: #fff;
    font-size: 10px;
    line-height: 1.85;
}

#introduction .kondo-youtube {
    margin: 64px 0 0;
    text-align: center;
}

#introduction .kondo-youtube a {
    border-bottom: 1px solid rgba(255, 255, 255, 0.72);
    color: #fff;
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    padding-bottom: 4px;
    text-decoration: none;
}

#introduction .kondo-youtube a:hover,
#introduction .kondo-youtube a:focus-visible {
    border-color: var(--blue);
    color: var(--blue);
    outline: none;
}

#introduction * {
    box-sizing: border-box;
}

#introduction .container {
    margin: 0 auto;
    max-width: 1440px;
    overflow: hidden;
    width: 100%;
}

#introduction figure,
#introduction blockquote,
#introduction p,
#introduction ol,
#introduction ul {
    margin: 0;
}

#introduction img {
    display: block;
    max-width: 100%;
}

#introduction .eyebrow,
#introduction .section-label {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.2em;
    line-height: 1.5;
}

#introduction .hero {
    min-height: min(647px, calc(92vh - 113px));
    overflow: hidden;
    position: relative;
}

#introduction .hero-visual {
    inset: 0;
    position: absolute;
}

#introduction .hero-visual img {
    filter: grayscale(1) contrast(1.08);
    height: 100%;
    object-fit: cover;
    object-position: center 48%;
    width: 100%;
}

#introduction .hero-visual figcaption {
    bottom: 24px;
    color: rgba(255, 255, 255, 0.45);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 9px;
    letter-spacing: 0.08em;
    position: absolute;
    right: 32px;
    z-index: 3;
}

#introduction .hero-shade {
    background:
        linear-gradient(90deg, rgba(2, 4, 6, 0.94) 0%, rgba(2, 4, 6, 0.72) 38%, rgba(2, 4, 6, 0.08) 76%),
        linear-gradient(0deg, rgba(2, 4, 6, 0.86) 0%, transparent 34%);
    inset: 0;
    position: absolute;
    z-index: 1;
}

#introduction .hero-copy {
    left: clamp(40px, 7vw, 104px);
    max-width: 720px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

#introduction .hero-copy .eyebrow {
    margin-bottom: 28px;
}

#introduction .hero h1 {
    color: var(--paper);
    font-size: clamp(32px, 4vw, 60px);
    font-weight: 500;
    letter-spacing: 0.025em;
    line-height: 1.48;
    margin: 0 0 30px;
}

#introduction .hero h1 em {
    color: #fff;
    font-style: normal;
    text-decoration: underline;
    text-decoration-color: rgba(168, 200, 231, 0.55);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.22em;
}

#introduction .hero h1.hero-quote {
    font-size: clamp(30px, 3.55vw, 52px);
}

#introduction .hero h1 cite {
    color: rgba(255, 255, 255, 0.58);
    display: block;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 0.44em;
    font-style: normal;
    font-weight: 500;
    letter-spacing: 0.14em;
    margin-top: 12px;
}

#introduction .hero .lead {
    color: rgba(255, 255, 255, 0.68);
    font-size: 14px;
    line-height: 2;
    max-width: 680px;
}

#introduction main {
    margin: 0 auto;
    padding: 0 clamp(40px, 7vw, 104px) 100px;
}

#introduction .chapter,
#introduction .diagram-section,
#introduction .equipment-section,
#introduction .periods-section,
#introduction .philosophy {
    border-top: 1px solid var(--hairline);
    padding: 68px 0 92px;
}

#introduction .chapter {
    display: grid;
    gap: clamp(40px, 6vw, 90px);
    grid-template-columns: minmax(220px, 0.7fr) minmax(0, 2fr);
}

#introduction .chapter-head .section-label {
    margin-bottom: 22px;
}

#introduction .chapter-head h2,
#introduction .cc500-copy h2 {
    color: var(--paper);
    font-size: clamp(23px, 2.45vw, 36px);
    font-weight: 500;
    letter-spacing: 0.035em;
    line-height: 1.55;
    margin: 0;
}

#introduction .chapter-head > p:last-child {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.95;
    margin-top: 20px;
    max-width: 430px;
}

#introduction .prose-columns {
    column-count: 2;
    column-gap: 42px;
}

#introduction .chapter-body > p,
#introduction .cc500-copy > p:last-child {
    color: var(--muted);
    font-size: 14px;
    line-height: 2.08;
}

#introduction .prose-columns p {
    break-inside: avoid;
    margin-bottom: 0;
}

#introduction .world-context {
    border-left: 1px solid rgba(168, 200, 231, 0.35);
    display: grid;
    gap: 12px 20px;
    grid-column: 2;
    grid-template-columns: 105px minmax(0, 1fr);
    margin-top: 6px;
    padding: 20px 24px;
}

#introduction .world-context span {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 9px;
    letter-spacing: 0.08em;
}

#introduction .world-context b {
    color: rgba(255, 255, 255, 0.68);
    font-size: 11px;
    font-weight: 500;
}

#introduction .diagram-section {
    display: grid;
    gap: 42px;
    grid-template-columns: 270px minmax(0, 1fr);
}

#introduction .diagram-gallery {
    display: grid;
    gap: 18px;
    grid-column: 1 / -1;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    justify-self: center;
    min-width: 0;
    width: 80%;
}

#introduction .diagram-section > .chapter-head {
    grid-column: 1 / -1;
}

#introduction .diagram-figure {
    background: #dddcd7;
    padding: clamp(12px, 2vw, 24px);
}

#introduction .diagram-figure a,
#introduction .diagram-figure a:hover {
    border: 0;
    display: block;
    padding: 0;
}

#introduction .diagram-figure img {
    mix-blend-mode: multiply;
    width: 100%;
}

#introduction figure figcaption {
    color: rgba(255, 255, 255, 0.44);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 9px;
    letter-spacing: 0.06em;
    line-height: 1.7;
    margin-top: 12px;
}

#introduction .diagram-figure figcaption {
    color: rgba(0, 0, 0, 0.56);
}

#introduction .process-strip {
    display: grid;
    gap: 0;
    grid-column: 1 / -1;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    list-style: none;
    padding: 0;
}

#introduction .process-strip li {
    border-left: 1px solid var(--hairline);
    display: grid;
    align-content: start;
    gap: 9px;
    list-style: none;
    min-height: 240px;
    padding: 18px 20px 22px;
}

#introduction .process-strip b,
#introduction .process-strip span {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

#introduction .process-strip b {
    color: rgba(168, 200, 231, 0.48);
    font-size: 9px;
}

#introduction .process-strip span {
    color: var(--paper);
    font-family: inherit;
    font-size: 14px;
    letter-spacing: 0.04em;
    line-height: 1.6;
}

#introduction .process-strip em {
    color: rgba(255, 255, 255, 0.45);
    font-size: 11px;
    font-style: normal;
    line-height: 1.85;
    margin-top: 4px;
}

#introduction .collaboration .chapter-body {
    display: grid;
    gap: 38px;
    grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.4fr);
}

#introduction .collaboration .large-copy {
    color: rgba(255, 255, 255, 0.86);
    font-size: clamp(19px, 2vw, 28px);
    line-height: 1.8;
}

#introduction .cc500-feature {
    background: #0a0c0e;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.8fr);
    margin: 0 calc(clamp(40px, 7vw, 104px) * -1);
}

#introduction .cc500-feature figure {
    min-height: 540px;
    position: relative;
}

#introduction .cc500-feature figure img {
    filter: grayscale(1) contrast(1.06);
    height: 100%;
    object-fit: cover;
    width: 100%;
}

#introduction .cc500-feature figure figcaption {
    bottom: 16px;
    left: 22px;
    margin: 0;
    position: absolute;
    text-shadow: 0 1px 4px #000;
}

#introduction .cc500-copy {
    align-self: center;
    padding: 54px clamp(36px, 5vw, 72px);
}

#introduction .cc500-copy .section-label {
    margin-bottom: 24px;
}

#introduction .cc500-copy h2 {
    margin-bottom: 30px;
}

#introduction .equipment-section {
    display: grid;
    gap: 54px;
    grid-template-columns: 270px minmax(0, 1fr);
}

#introduction .equipment-section > .chapter-head > p:last-child {
    font-size: 15px;
}

#introduction .equipment-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

#introduction .equipment-grid section {
    border-left: 1px solid var(--hairline);
    border-top: 1px solid var(--hairline);
    min-height: 200px;
    padding: 24px 28px;
}

#introduction .equipment-grid section > b {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 11px;
    letter-spacing: 0.14em;
}

#introduction .equipment-grid h3 {
    color: rgba(255, 255, 255, 0.84);
    font-size: 17px;
    line-height: 1.6;
    margin: 16px 0 10px;
}

#introduction .equipment-grid p,
#introduction .equipment-note {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
    line-height: 1.9;
}

#introduction .equipment-grid .photo-index {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 0.95em;
    font-weight: 600;
    letter-spacing: 0.025em;
    white-space: nowrap;
}

#introduction .equipment-note {
    border-left: 1px solid rgba(168, 200, 231, 0.48);
    grid-column: 2;
    padding: 12px 20px;
}

#introduction .studio-panorama {
    margin: 0 calc(clamp(40px, 7vw, 104px) * -1);
    max-height: 680px;
    overflow: hidden;
    position: relative;
}

#introduction .studio-panorama img {
    filter: grayscale(1) contrast(1.08);
    width: 100%;
}

#introduction .studio-panorama::after {
    background: linear-gradient(0deg, rgba(5, 6, 7, 0.68), transparent 34%);
    content: '';
    inset: 0;
    position: absolute;
}

#introduction .studio-panorama figcaption {
    bottom: 18px;
    left: clamp(40px, 7vw, 104px);
    margin: 0;
    position: absolute;
    z-index: 2;
}

#introduction .periods-section {
    display: grid;
    gap: 42px;
    grid-template-columns: 230px minmax(0, 1fr);
}

#introduction .period-grid {
    display: grid;
    gap: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    list-style: none;
    padding: 0;
}

#introduction .period-grid li {
    border-left: 1px solid var(--hairline);
    list-style: none;
    padding: 20px 24px 8px;
}

#introduction .period-grid time {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 20px;
    letter-spacing: 0.04em;
}

#introduction .period-grid h3 {
    color: rgba(255, 255, 255, 0.84);
    font-size: 14px;
    line-height: 1.6;
    margin: 18px 0 15px;
}

#introduction .period-grid h3 small {
    color: var(--blue);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 9px;
    letter-spacing: 0.08em;
}

#introduction .period-grid .period-copy {
    color: rgba(255, 255, 255, 0.5);
    font-size: 11px;
    line-height: 1.95;
}

#introduction .philosophy {
    display: grid;
    gap: 48px;
}

#introduction .philosophy-head {
    align-items: end;
    display: grid;
    gap: 42px;
    grid-template-columns: 190px minmax(0, 1fr);
}

#introduction .philosophy-head h2 {
    color: rgba(255, 255, 255, 0.94);
    font-size: clamp(25px, 3vw, 40px);
    font-weight: 500;
    letter-spacing: 0.035em;
    line-height: 1.55;
    margin: 0;
}

#introduction .philosophy-essay {
    column-count: 2;
    column-gap: clamp(42px, 6vw, 76px);
    column-rule: 1px solid rgba(135, 164, 186, 0.16);
}

#introduction .philosophy-essay p {
    break-inside: avoid;
    color: rgba(255, 255, 255, 0.66);
    font-size: 15px;
    line-height: 2.08;
    margin: 0 0 1.55em;
}

#introduction .philosophy-essay .philosophy-thesis {
    border-left: 2px solid var(--blue);
    color: rgba(255, 255, 255, 0.9);
    padding-left: 20px;
}

#introduction .philosophy-essay .philosophy-author {
    color: var(--blue);
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 0.16em;
    margin: 36px 0 0;
    text-align: right;
}
#introduction section.container {
    box-sizing: border-box;
    display: block;
    padding: 64px;
    width: 960px;
    overflow: hidden;
}

#introduction section.container section.image-container {
    background: url("../images/image01.jpg") no-repeat;
    background-size: contain;
    display: block;
    width: 832px;
    height: 416px;
    margin-bottom: 4em;
}

#introduction section.container p {
    font-size: 108%;
    line-height: 2.2em;
    margin-bottom: 1.8em;
}

#introduction .introduction-header {
    margin-bottom: 3em;
}

#introduction .introduction-header .eyebrow {
    font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    font-size: 77%;
    letter-spacing: 0.18em;
    line-height: 1.4em;
    margin-bottom: 1em;
    opacity: 0.72;
}

#introduction .introduction-header h1 {
    font-size: 197%;
    font-weight: bold;
    line-height: 1.6em;
}

#introduction .introduction-section {
    margin-bottom: 6em;
}

#introduction .introduction-section h2 {
    border-left: 2px solid rgba(255, 255, 255, 0.56);
    font-size: 146.5%;
    line-height: 1.7em;
    margin-bottom: 1.5em;
    padding-left: 20px;
}

#introduction .introduction-part {
    margin-bottom: 9em;
}

#introduction .part-label {
    border-bottom: 1px solid rgba(255, 255, 255, 0.32);
    font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    font-size: 93%;
    letter-spacing: 0.16em;
    margin-bottom: 5em;
    padding-bottom: 14px;
}

#introduction .period {
    border-left: 1px solid rgba(255, 255, 255, 0.22);
    box-sizing: border-box;
    margin: 0 0 6em 12px;
    padding-left: 32px;
}

#introduction .period h3 {
    font-size: 131%;
    line-height: 1.7em;
    margin-bottom: 1.7em;
}

#introduction .period h3 span {
    font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    margin-right: 8px;
    opacity: 0.64;
}

#introduction .period h3 small {
    font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    font-size: 67%;
    letter-spacing: 0.08em;
    margin-left: 12px;
    white-space: nowrap;
}

#introduction .equipment-list {
    border-top: 1px solid rgba(255, 255, 255, 0.24);
}

#introduction .equipment-list li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    font-size: 108%;
    line-height: 2em;
    padding: 18px 16px 18px 36px;
    position: relative;
}

#introduction .equipment-list li::before {
    content: '\2014';
    left: 8px;
    opacity: 0.56;
    position: absolute;
    top: 18px;
}

#introduction .future-part {
    margin-bottom: 2em;
}

#introduction .final-section {
    margin-bottom: 2em;
}