:root {
    --bg: #ffffff;
    --text: #111111;
    --text-soft: #62656c;
    --line: #e6e7eb;
    --line-strong: #d0d3da;
    --panel: rgba(255, 255, 255, 0.88);
    --shadow: 0 10px 30px rgba(20, 20, 20, 0.08);
    --content-width: 1100px;
    --header-height: 76px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    background:
        radial-gradient(circle at top left, rgba(17, 17, 17, 0.04), transparent 22%),
        linear-gradient(180deg, #ffffff 0%, #fbfbfc 100%);
    color: var(--text);
    font-family: "Figtree", sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}

img,
video {
    display: block;
    max-width: 100%;
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
}

a:focus-visible,
button:focus-visible,
.interactive-image:focus-visible {
    outline: 2px solid #111111;
    outline-offset: 3px;
}

.skip-link {
    position: fixed;
    top: 0.8rem;
    left: 1rem;
    z-index: 2000;
    padding: 0.75rem 1rem;
    border: 1px solid var(--line-strong);
    background: #ffffff;
    color: var(--text);
    transform: translateY(-140%);
    transition: transform 0.2s ease;
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: fixed;
    top: 1rem;
    left: 50%;
    z-index: 1000;
    transform: translateX(-50%);
    width: min(calc(100% - 1.5rem), 900px);
    pointer-events: none;
}

.site-header.is-scrolled .header-inner {
    box-shadow: 0 12px 28px rgba(17, 17, 17, 0.08);
}

.header-inner {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: var(--header-height);
    padding: 0.55rem 1rem;
    border: 1px solid var(--line-strong);
    background: var(--panel);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    pointer-events: auto;
}

.header-inner::before,
.header-inner::after {
    content: "";
    position: absolute;
    top: -4px;
    width: 8px;
    height: 8px;
    background: #d7d9de;
}

.header-inner::before {
    left: -4px;
    box-shadow: calc(100% + 8px) 0 0 #d7d9de;
}

.header-inner::after {
    right: -4px;
    box-shadow: calc(-100% - 8px) 0 0 #d7d9de;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    min-width: 0;
}

.brand img {
    width: 26px;
    height: 26px;
    object-fit: contain;
    opacity: 0.75;
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
    min-width: 0;
}

.brand-name,
.brand-role {
    white-space: nowrap;
}

.brand-name {
    font-family: "Outfit", sans-serif;
    font-size: 0.98rem;
    font-weight: 400;
    letter-spacing: -0.03em;
}

.brand-role {
    color: #6f737a;
    font-size: 0.78rem;
    font-weight: 300;
}

.header-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0.6rem 0.95rem;
    border: 1px solid var(--line);
    background: #ffffff;
    color: #5e6168;
    font-family: "Outfit", sans-serif;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.header-link:hover {
    color: var(--text);
    border-color: var(--line-strong);
    transform: translateY(-1px);
}

.page-shell {
    width: min(100%, var(--content-width));
    margin: 0 auto;
    padding-inline: 1.5rem;
}

.breadcrumb {
    padding-top: 6.5rem;
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--text-soft);
    font-size: 0.86rem;
}

.breadcrumb li {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb li + li::before {
    content: "/";
    color: #c1c4ca;
}

main.page-shell {
    padding-top: 1.25rem;
    padding-bottom: 4rem;
}

.case-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 290px;
    gap: 1.5rem;
    align-items: start;
}

.content-column {
    display: grid;
    gap: 1.5rem;
}

.hero-card,
.content-card,
.meta-card,
.toc-card,
.contact-card,
.case-nav {
    position: relative;
    background: #ffffff;
    border: 1px solid var(--line);
}

.hero-card::before,
.content-card::before,
.meta-card::before,
.toc-card::before,
.contact-card::before,
.case-nav::before,
.hero-card::after,
.content-card::after,
.meta-card::after,
.toc-card::after,
.contact-card::after,
.case-nav::after {
    content: "+";
    position: absolute;
    top: 0;
    color: #a7aab2;
    font-family: monospace;
    font-size: 0.95rem;
    line-height: 1;
}

.hero-card::before,
.content-card::before,
.meta-card::before,
.toc-card::before,
.contact-card::before,
.case-nav::before {
    left: 0;
    transform: translate(-50%, -50%);
}

.hero-card::after,
.content-card::after,
.meta-card::after,
.toc-card::after,
.contact-card::after,
.case-nav::after {
    right: 0;
    transform: translate(50%, -50%);
}

.hero-card,
.content-card,
.meta-card,
.toc-card,
.contact-card {
    padding: 2rem;
}

.hero-card h1 {
    margin: 0;
    font-family: "Outfit", sans-serif;
    font-size: clamp(2.6rem, 5.5vw, 4.4rem);
    font-weight: 300;
    line-height: 0.98;
    letter-spacing: -0.06em;
}

.hero-card .subtitle {
    margin: 1rem 0 1rem;
    color: var(--text-soft);
    font-family: "Outfit", sans-serif;
    font-size: clamp(1rem, 2vw, 1.1rem);
    font-weight: 300;
    letter-spacing: -0.02em;
}

.hero-card p,
.content-card p,
.content-card li,
.meta-card dd,
.toc-card li,
.contact-card p,
figcaption,
.lightbox-hint {
    color: var(--text-soft);
}

.hero-card p + p,
.content-card p + p {
    margin-top: 1rem;
}

.case-highlight {
    display: grid;
    grid-template-columns: minmax(155px, 0.55fr) minmax(0, 1.45fr);
    gap: 1rem;
    margin-top: 1.25rem;
    padding: 1rem 0;
    border-top: 1px solid var(--line-strong);
    border-bottom: 1px solid var(--line-strong);
}

.case-highlight strong {
    color: var(--text);
    font-family: "Outfit", sans-serif;
    font-weight: 500;
}

.case-highlight span {
    color: var(--text-soft);
}

.hero-card figure,
.content-card figure {
    margin: 1.5rem 0 0;
}

.hero-card img,
.content-card img,
.video-container video {
    width: 100%;
    border: 1px solid var(--line);
    background: #f5f5f5;
}

.video-container {
    margin-top: 1.25rem;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: 1.5rem;
}

.content-card h2,
.contact-card h2,
.case-nav h2,
.meta-card h2,
.toc-card h2 {
    margin: 0 0 0.85rem;
    font-family: "Outfit", sans-serif;
    font-weight: 300;
    letter-spacing: -0.05em;
}

.content-card h2 {
    font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.content-card h3 {
    margin: 1.2rem 0 0.45rem;
    font-family: "Outfit", sans-serif;
    font-size: 1.12rem;
    font-weight: 400;
    letter-spacing: -0.03em;
}

.content-card ul {
    margin: 1rem 0 0;
    padding-left: 1.1rem;
}

.content-card li + li {
    margin-top: 0.5rem;
}

.reference-disclosure {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}

.reference-disclosure summary {
    color: #4f535b;
    cursor: pointer;
    font-family: "Outfit", sans-serif;
    font-weight: 500;
}

.reference-disclosure[open] summary {
    color: var(--text);
}

.issue-list {
    display: grid;
    gap: 0.8rem;
    margin-top: 1.2rem;
}

.issue-item {
    padding: 1.1rem 1.15rem;
    border: 1px solid var(--line);
    background: #fcfcfd;
}

.issue-item h3 {
    margin-top: 0;
}

figure {
    margin: 1.5rem 0 0;
}

.screenshot-placeholder {
    display: grid;
    place-items: center;
    min-height: clamp(220px, 38vw, 420px);
    padding: 1.5rem;
    border: 1px dashed var(--line-strong);
    background:
        linear-gradient(180deg, rgba(17, 17, 17, 0.02), rgba(17, 17, 17, 0.04)),
        #fcfcfd;
    color: #6f737a;
    font-family: "Outfit", sans-serif;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    text-align: center;
}

figcaption {
    margin-top: 0.65rem;
    font-size: 0.9rem;
}

.sidebar {
    position: sticky;
    top: 6.9rem;
    display: grid;
    gap: 1rem;
}

.meta-card dl {
    display: grid;
    gap: 0.9rem;
    margin: 0;
}

.meta-card dt {
    margin: 0;
    color: #5e6168;
    font-family: "Outfit", sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.meta-card dd {
    margin: 0.25rem 0 0;
}

.toc-card ul,
.case-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.toc-card li + li,
.case-nav li + li {
    margin-top: 0.45rem;
}

.toc-card a,
.case-nav a {
    display: block;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--line);
    background: #ffffff;
    color: #5e6168;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.toc-card a:hover,
.toc-card a.is-current,
.case-nav a:hover {
    color: var(--text);
    border-color: var(--line-strong);
    background: #fbfbfc;
}

.reading-time {
    margin-top: 0.95rem;
    color: var(--text-soft);
    font-size: 0.84rem;
}

.button,
.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    margin-top: 0.75rem;
    padding: 0.65rem 1rem;
    border: 1px solid #161616;
    background: #ffffff;
    color: #111111;
    font-size: 0.84rem;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.button:hover,
.button-secondary:hover {
    background: #111111;
    color: #ffffff;
    transform: translateY(-1px);
}

.back-to-top-container {
    display: flex;
    justify-content: center;
}

.back-to-top-btn {
    opacity: 0;
    pointer-events: none;
    min-height: 42px;
    padding: 0.65rem 1rem;
    border: 1px solid #161616;
    background: #ffffff;
    color: #111111;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

.back-to-top-btn.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top-btn:hover {
    background: #111111;
    color: #ffffff;
    transform: translateY(-1px);
}

.case-nav {
    padding: 1.6rem;
}

.contact-detail {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 1rem;
}

.contact-detail strong {
    font-family: "Outfit", sans-serif;
    font-weight: 500;
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    place-items: center;
    padding: 1rem;
    background: rgba(17, 17, 17, 0.82);
}

.lightbox.is-open {
    display: grid;
}

.lightbox-dialog {
    position: relative;
    width: min(100%, 980px);
    padding: 1rem;
    border: 1px solid var(--line);
    background: #ffffff;
    box-shadow: var(--shadow);
}

.lightbox img {
    width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

.lightbox-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: #ffffff;
    color: #111111;
    cursor: pointer;
    font-size: 1.4rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.lightbox-close:hover {
    background: #111111;
    color: #ffffff;
}

.interactive-image {
    cursor: zoom-in;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 1020px) {
    .case-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }
}

@media (max-width: 760px) {
    .site-header {
        width: min(calc(100% - 1rem), 900px);
    }

    .header-inner {
        min-height: 62px;
        padding-inline: 0.7rem;
    }

    .brand-role {
        display: none;
    }

    .breadcrumb {
        padding-top: 5.8rem;
    }

    .page-shell {
        padding-inline: 1rem;
    }

    .hero-card,
    .content-card,
    .meta-card,
    .toc-card,
    .contact-card,
    .case-nav {
        padding: 1.35rem;
    }

    .image-gallery {
        grid-template-columns: 1fr;
    }

    .case-highlight {
        grid-template-columns: 1fr;
        gap: 0.35rem;
    }
}

@media (max-width: 560px) {
    .brand-copy {
        max-width: 150px;
    }

    .brand-name {
        font-size: 0.9rem;
    }

    .header-link {
        min-height: 36px;
        padding-inline: 0.75rem;
        font-size: 0.82rem;
    }

    .breadcrumb {
        font-size: 0.8rem;
    }

    .contact-detail {
        flex-direction: column;
        gap: 0.25rem;
    }
}

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

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}