@charset "UTF-8";

/* ========================================
   Tokens — Museum palette × Citizen accent
   ======================================== */
:root {
    /* Color */
    --bg:            #faf8f3;  /* warm cream / paper */
    --bg-alt:        #f3efe6;  /* slightly deeper surface */
    --ink:           #1a1a1a;  /* main text */
    --ink-sub:       #5c5c5c;  /* secondary text */
    --ink-mute:      #8a8478;  /* labels, captions */
    --hairline:      #d8d3c5;  /* division lines */
    --hairline-soft: #e8e3d5;  /* soft division */
    --accent:        #c8102e;  /* Citizen red */
    --accent-soft:   #fbe9ec;

    /* Typography */
    --serif: "Noto Serif JP", "游明朝", "Yu Mincho", "Hiragino Mincho ProN", serif;
    --sans:  "Noto Sans JP", "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;

    /* Layout */
    --max-width: 1240px;
    --gutter: 1.25rem;
}

/* ========================================
   Reset & Base
   ======================================== */
html {
    scroll-behavior: smooth;
}

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

body {
    font-family: var(--sans);
    font-weight: 400;
    line-height: 1.8;
    color: var(--ink);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection {
    background: var(--accent-soft);
    color: var(--ink);
}

.skip-link {
    position: fixed;
    top: 0;
    left: var(--gutter);
    z-index: 2000;
    padding: 0.75rem 1rem;
    color: var(--bg);
    background: var(--ink);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transform: translateY(-120%);
    transition: transform 0.15s ease;
}

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

/* ========================================
   Layout
   ======================================== */
.layout-wrapper {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem var(--gutter) 4rem;
}

@media (min-width: 900px) {
    .layout-wrapper {
        grid-template-columns: 220px minmax(0, 1fr);
        gap: 3rem;
        padding: 2.5rem 2rem 5rem;
        align-items: start;
    }
}

.main-content {
    min-width: 0;
}

/* ========================================
   Site Header / Footer — 領域確保のみ（中身未定）
   ======================================== */
.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--hairline);
}

.site-header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--gutter);
    min-height: 4rem;
    display: flex;
    align-items: center;
}

.site-header__placeholder {
    font-family: var(--sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ink-mute);
}

.site-header__brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s;
}

.site-header__brand:hover {
    opacity: 0.65;
}

.site-header__logo {
    display: block;
    width: 100%;
    max-width: 130px;
    height: auto;
}

.site-footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--hairline);
    margin-top: 4rem;
}

.site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem var(--gutter) 2rem;
}

.site-footer__columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

.footer-col__title {
    font-family: var(--sans);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--hairline-soft);
}

.footer-col__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.footer-col__list a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--ink-sub);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.5;
    transition: color 0.2s;
}

.footer-col__list a:hover {
    color: var(--ink);
}

.footer-col__ext {
    flex: 0 0 auto;
    width: 11px;
    height: 11px;
    opacity: 0.55;
    transition: opacity 0.2s;
}

.footer-col__list a:hover .footer-col__ext {
    opacity: 0.9;
}

.footer-col__sns {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.footer-col__sns a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border: 1px solid var(--hairline);
    border-radius: 50%;
    color: var(--ink-sub);
    background: transparent;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.footer-col__sns a:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

.footer-col__sns svg {
    width: 22px;
    height: 22px;
}

.site-footer__copyright {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--hairline-soft);
    text-align: center;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--ink-mute);
}

@media (min-width: 768px) {
    .site-footer__columns {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 3rem;
    }
}

@media (min-width: 900px) {
    .site-header__inner {
        padding: 0 2rem;
        min-height: 5rem;
    }
    .site-header__logo {
        max-width: 160px;
    }
    .site-footer {
        margin-top: 6rem;
    }
    .site-footer__inner {
        padding: 4rem 2rem 2.5rem;
    }
    .site-footer__columns {
        gap: 4rem;
    }
}

/* ========================================
   Page Hero — シチズン HERO ビジュアル
   ======================================== */
.page-hero {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    text-align: center;
    color: var(--bg);
    border-bottom: 1px solid var(--hairline);
}

.page-hero__bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
    display: block;
}

.page-hero__overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.28) 45%, rgba(0, 0, 0, 0.6) 100%);
    z-index: -1;
}

.page-hero__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem var(--gutter);
    min-height: 16rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.page-hero__eyebrow {
    font-family: var(--sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: #e8b96b; /* warm gold — image の粒子トーンに合わせる */
    margin-bottom: 1.25rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.page-hero__title {
    font-family: var(--serif);
    font-weight: 300;
    font-size: clamp(1.6rem, 4.4vw, 2.6rem);
    line-height: 1.45;
    letter-spacing: 0.1em;
    color: #faf8f3;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
}

.page-hero__lead {
    font-family: var(--serif);
    font-weight: 300;
    font-size: 0.95rem;
    line-height: 1.9;
    letter-spacing: 0.12em;
    color: rgba(250, 248, 243, 0.82);
    margin-top: 1.25rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* スマホ時のみタイトルを2行に分割 */
.page-hero__title-break {
    display: inline;
}

@media (min-width: 768px) {
    .page-hero__title-break {
        display: none;
    }
}

@media (min-width: 900px) {
    .page-hero__inner {
        padding: 7rem 2rem;
        min-height: 22rem;
    }
}

/* ========================================
   Sidebar — Decade Navigation
   ======================================== */
.sidebar {
    display: none;
}

@media (min-width: 900px) {
    .sidebar {
        display: block;
        position: sticky;
        top: 2.5rem;
        max-height: calc(100vh - 5rem);
        overflow-y: auto;
        padding-right: 0.5rem;
    }
}

.decade-nav {
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--hairline);
    padding: 0.25rem 0;
}

.decade-nav__link {
    position: relative;
    display: block;
    padding: 0.65rem 0 0.65rem 1.5rem;
    margin-left: -1px;
    text-decoration: none;
    font-family: var(--serif);
    font-weight: 300;
    font-size: 0.95rem;
    letter-spacing: 0.06em;
    color: var(--ink-sub);
    border-left: 1px solid transparent;
    transition: color 0.25s ease, border-color 0.25s ease;
}

.decade-nav__link:hover {
    color: var(--ink);
}

.decade-nav__link.is-active {
    color: var(--accent);
    font-weight: 500;
    border-left-color: var(--accent);
}

/* ========================================
   Intro
   ======================================== */
.intro {
    max-width: 640px;
    margin: 0 0 4.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--hairline);
}

.intro__title {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.4rem, 2.8vw, 1.75rem);
    letter-spacing: 0.08em;
    color: var(--ink);
    margin: 0 0 1.25rem;
}

.intro__text {
    font-family: var(--sans);
    font-size: 0.9rem;
    line-height: 2;
    color: var(--ink-sub);
    margin: 0 0 1rem;
}

.intro__text:last-child {
    margin-bottom: 0;
}

/* ========================================
   Timeline
   ======================================== */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 5.5rem;
}

@media (min-width: 900px) {
    .timeline {
        gap: 8rem;
    }
}

.timeline__item {
    min-width: 0;
    scroll-margin-top: 2rem;
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.9s ease-out, transform 0.9s ease-out;
}

.timeline__item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Continued — 表示範囲の末尾に出す予告表示 */
.timeline__continued {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 0 1rem;
    text-align: center;
}

.timeline__continued-text {
    font-family: var(--serif);
    font-weight: 200;
    font-size: clamp(2rem, 6vw, 3.25rem);
    letter-spacing: 0.14em;
    color: var(--ink-mute);
    margin: 0;
}

.timeline__continued-text::after {
    content: "";
    display: block;
    width: 3rem;
    height: 1px;
    background: var(--accent);
    margin: 1.25rem auto 0;
}

.timeline__continued-note {
    font-family: var(--sans);
    font-size: 0.85rem;
    line-height: 1.9;
    color: var(--ink-sub);
    margin: 1.25rem 0 0;
}

/* Archive CTA */
.archive-cta {
    margin-top: 5rem;
    padding: 3.5rem 1.5rem;
    text-align: center;
    background: var(--bg-alt);
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
}

.archive-cta__eyebrow {
    margin: 0 0 1rem;
    font-family: var(--sans);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--accent);
}

.archive-cta__title {
    margin: 0;
    font-family: var(--serif);
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 400;
    letter-spacing: 0.08em;
}

.archive-cta__text {
    max-width: 34rem;
    margin: 1.25rem auto 2rem;
    font-size: 0.9rem;
    line-height: 1.9;
    color: var(--ink-sub);
}

.archive-cta__primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0.8rem 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--bg);
    background: var(--ink);
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.archive-cta__primary:hover {
    background: var(--accent);
}

.archive-cta__secondary {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.archive-cta__secondary a {
    color: var(--ink-sub);
    font-size: 0.8rem;
    text-underline-offset: 0.25em;
}

.archive-cta__primary:focus-visible,
.archive-cta__secondary a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

@media (min-width: 768px) {
    .archive-cta {
        padding: 4.5rem 2rem;
    }

    .archive-cta__secondary {
        flex-direction: row;
        justify-content: center;
        gap: 2rem;
    }
}

/* Year — large display numerals */
.timeline__year {
    font-family: var(--serif);
    font-weight: 200;
    font-size: clamp(4.5rem, 13vw, 9rem);
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--ink);
    font-feature-settings: "palt", "lnum";
}

.timeline__year::after {
    content: "";
    display: block;
    width: 3rem;
    height: 1px;
    background: var(--accent);
    margin-top: 1.25rem;
}

/* Content block */
.timeline__content {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    margin-top: 1.5rem;
    min-width: 0;
}

.timeline__title {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.5rem, 3.2vw, 2.1rem);
    line-height: 1.3;
    letter-spacing: 0.06em;
    color: var(--ink);
}

/* Meta — table-like specs */
.timeline__meta {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.6rem;
    background: transparent;
    padding: 1.5rem 0;
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
    border-radius: 0;
    margin: 0;
}

@media (min-width: 768px) {
    .timeline__meta {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem 2.5rem;
    }
}

.timeline__meta-item {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
    font-family: var(--sans);
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--ink);
    word-break: break-word;
    overflow-wrap: anywhere;
}

.timeline__meta-label {
    font-family: var(--sans);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-right: 0;
}

/* Descriptions */
.timeline__description {
    margin: 0;
}

.timeline__description--official {
    font-family: var(--sans);
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.95;
    color: var(--ink);
    background: transparent;
}

.timeline__description--note {
    position: relative;
    font-family: var(--serif);
    font-weight: 400;
    font-size: 1.05rem;
    line-height: 2.05;
    color: var(--ink);
    background: transparent;
    padding: 1.75rem 0 0.5rem 1.75rem;
    border-left: 2px solid var(--accent);
    border-radius: 0;
}

.timeline__description--note::before {
    content: "— 解説";
    display: block;
    position: absolute;
    top: 0;
    left: 1.75rem;
    font-family: var(--sans);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--accent);
    text-transform: uppercase;
}

/* Current model link */
.timeline__current {
    margin-top: 0.5rem;
}

.timeline__current-label {
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    color: var(--ink);
    margin: 0 0 0.5rem;
}

.timeline__current-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--sans);
    font-size: 0.9rem;
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity 0.2s ease;
}

.timeline__current-link:hover {
    opacity: 0.7;
}

.timeline__current-ext {
    flex: 0 0 auto;
    width: 12px;
    height: 12px;
}

.loading {
    text-align: center;
    font-family: var(--serif);
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--ink-sub);
    padding: 4rem 0;
}

/* ========================================
   Image Gallery (Hero + Thumbs)
   ======================================== */
.gallery {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 0;
    min-width: 0;
    max-width: 100%;
}

.gallery__hero {
    display: block;
    width: 100%;
    max-width: 100%;
    aspect-ratio: 3 / 2;
    padding: 0;
    border: none;
    background: #1a1a1a;
    overflow: hidden;
    cursor: zoom-in;
}

.gallery__hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.7s ease;
}

.gallery__hero:hover img {
    transform: scale(1.025);
}

.gallery__thumbs {
    display: flex;
    gap: 0.5rem;
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--hairline) transparent;
    padding-bottom: 4px;
    /* iOS / Safari の横スクロールでフックを残す */
    scroll-snap-type: x proximity;
}

/* スマホ時はスクロールバーを常時表示してスクロール可能であることを示す */
@media (max-width: 767px) {
    .gallery__thumbs {
        padding-bottom: 14px;
        scrollbar-color: var(--hairline) var(--hairline-soft);
    }

    .gallery__thumbs::-webkit-scrollbar {
        height: 6px;
        -webkit-appearance: none;
    }

    .gallery__thumbs::-webkit-scrollbar-track {
        background: var(--hairline-soft);
        border-radius: 999px;
    }

    .gallery__thumbs::-webkit-scrollbar-thumb {
        background: var(--hairline);
        border-radius: 999px;
    }

    .gallery__thumbs::-webkit-scrollbar-thumb:active {
        background: var(--ink-mute);
    }
}

.gallery__thumb {
    flex: 0 0 auto;
    width: 64px;
    height: 64px;
    padding: 0;
    border: 1px solid transparent;
    background: #1a1a1a;
    cursor: pointer;
    overflow: hidden;
    opacity: 0.5;
    scroll-snap-align: start;
    transition: opacity 0.25s, border-color 0.25s;
}

.gallery__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.gallery__thumb:hover {
    opacity: 0.85;
}

.gallery__thumb.is-active {
    opacity: 1;
    border-color: var(--accent);
}

@media (min-width: 768px) {
    .gallery__thumb {
        width: 76px;
        height: 76px;
    }
}

@media (min-width: 900px) {
    .gallery__hero {
        aspect-ratio: 16 / 10;
    }
    .gallery__thumb {
        width: 88px;
        height: 88px;
    }
}

/* ========================================
   FAB — Mobile menu trigger
   ======================================== */
.fab {
    position: fixed;
    bottom: 22px;
    right: 22px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--ink);
    color: var(--bg);
    border: none;
    box-shadow: 0 8px 20px rgba(26, 26, 26, 0.18);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: transform 0.2s, background-color 0.2s;
}

.fab:hover {
    transform: scale(1.05);
    background: var(--accent);
}

.fab:active {
    transform: scale(0.95);
}

.fab__icon {
    display: block;
}

@media (min-width: 900px) {
    .fab {
        display: none;
    }
}

/* ========================================
   Mobile Menu Overlay
   ======================================== */
.mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 26, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1100;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mobile-menu-overlay[hidden] {
    display: none;
}

.mobile-menu {
    background: var(--bg);
    width: 90%;
    max-width: 380px;
    max-height: 80vh;
    padding: 2rem 1.75rem 1.5rem;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
}

.mobile-menu__title {
    font-family: var(--serif);
    font-weight: 300;
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    text-align: center;
    color: var(--ink);
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--hairline);
}

.mobile-decade-nav {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    margin-bottom: 1.25rem;
}

.mobile-decade-nav .decade-nav__link {
    display: block;
    text-align: center;
    background: transparent;
    padding: 0.85rem 0;
    border: none;
    border-bottom: 1px solid var(--hairline-soft);
    margin-left: 0;
    font-size: 1rem;
}

.mobile-decade-nav .decade-nav__link.is-active {
    border-left: none;
    border-bottom-color: var(--accent);
}

.mobile-menu__close {
    padding: 0.95rem;
    background: transparent;
    border: 1px solid var(--ink);
    border-radius: 0;
    cursor: pointer;
    font-family: var(--sans);
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.25em;
    color: var(--ink);
    transition: background-color 0.2s, color 0.2s;
}

.mobile-menu__close:hover {
    background: var(--ink);
    color: var(--bg);
}

/* ========================================
   Lightbox — Full-screen viewer
   ======================================== */
body.is-lightbox-open,
body.is-mobile-menu-open {
    overflow: hidden;
}

.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(15, 15, 15, 0.96);
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.lightbox[hidden] {
    display: none;
}

.lightbox__figure {
    max-width: 100%;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin: 0;
    touch-action: pan-y;
}

.lightbox__image {
    max-width: 100vw;
    max-height: 75vh;
    object-fit: contain;
    transition: opacity 0.22s ease;
}

.lightbox__image.is-loading {
    opacity: 0;
}

.lightbox__bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    max-width: 540px;
}

.lightbox__caption {
    color: rgba(255, 255, 255, 0.75);
    font-family: var(--serif);
    font-weight: 300;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    text-align: center;
    flex: 1;
    min-width: 0;
}

.lightbox__close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.4);
    color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.25);
    cursor: pointer;
    font-size: 1.3rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.lightbox__close:hover {
    color: white;
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(0, 0, 0, 0.6);
}

/* Nav buttons — モバイル時はキャプション横にインライン配置（B+C ハイブリッド） */
.lightbox__nav {
    flex: 0 0 auto;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: transparent;
    color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 2px;
    transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.2s;
}

.lightbox__nav:hover,
.lightbox__nav:active {
    color: white;
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.08);
}

/* PC: 従来通り画面端に絶対配置 */
@media (min-width: 768px) {
    .lightbox {
        padding: 1rem;
    }
    .lightbox__image {
        max-width: 90vw;
        max-height: 80vh;
    }
    .lightbox__bar {
        gap: 0;
        max-width: 100%;
    }
    .lightbox__nav {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        width: 48px;
        height: 48px;
        font-size: 1.6rem;
    }
    .lightbox__nav:hover {
        transform: translateY(-50%) scale(1.06);
    }
    .lightbox__nav--prev { left: 20px; }
    .lightbox__nav--next { right: 20px; }
}

@media (min-width: 900px) {
    .lightbox__close { top: 28px; right: 28px; }
    .lightbox__nav--prev { left: 28px; }
    .lightbox__nav--next { right: 28px; }
}

/* ========================================
   Reduced motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .timeline__item {
        opacity: 1;
        transform: none;
    }
}