/* 水中アーカイブの共通デザイン。背景の絵を主役にし、ガラスは操作面だけに使う。 */

:root {
    --bg-deep: #041422;
    --bg-glass: rgba(8, 28, 48, 0.28);
    --text-primary: #f3f8fb;
    --text-secondary: rgba(214, 232, 242, 0.78);
    --accent: #9be7ff;
    --accent-strong: #d8f6ff;
    --line: rgba(255, 255, 255, 0.3);
    --line-soft: rgba(255, 255, 255, 0.16);
    --shadow: rgba(0, 10, 24, 0.28);
    --radius: 1.25rem;
    --radius-sm: 0.8rem;
    --font-body: "DM Sans", "Hiragino Sans", "Noto Sans JP", sans-serif;
    --font-display: "Cormorant Garamond", "Times New Roman", serif;
    --site-max: 1080px;
    --nav-offset: 6.5rem;
    --px: 0;
    --py: 0;
    --scroll: 0;
    color-scheme: dark;
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    font-family: var(--font-body);
    color: var(--text-primary);
    background: var(--bg-deep);
    line-height: 1.65;
    overflow-x: hidden;
}

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

a {
    color: inherit;
}

button,
input {
    font: inherit;
    color: inherit;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -4rem;
    z-index: 30;
    padding: 0.5rem 0.8rem;
    background: #062033;
    border-radius: 999px;
}

.skip-link:focus {
    top: 1rem;
}

/* 固定の水中背景。絵が先に見え、キャンバスは準備後に重なる。 */
.world {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    background: var(--bg-deep);
}

.world-photo {
    position: absolute;
    inset: -3%;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: calc(70% + var(--px) * 14px) calc(64% + var(--py) * 10px - var(--scroll) * 28px);
    transform: scale(1.04);
}

.world-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s ease;
}

body.has-scene .world-canvas {
    opacity: 1;
}

body.has-photo .world-photo {
    opacity: 0;
}

.world-scrim {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(90deg, rgba(3, 14, 28, 0.62) 0%, rgba(3, 14, 28, 0.28) 34%, rgba(3, 14, 28, 0) 62%);
}

.world-surface {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
    background:
        radial-gradient(70% 42% at 50% -8%, rgba(214, 246, 255, 0.72), transparent 62%),
        linear-gradient(180deg, rgba(150, 220, 255, 0.28), transparent 46%);
    mix-blend-mode: screen;
}

.glass {
    position: relative;
    background: var(--bg-glass);
    border: 1px solid var(--line);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.38),
        inset 0 -1px 0 rgba(255, 255, 255, 0.06),
        0 12px 32px var(--shadow);
    backdrop-filter: blur(18px) saturate(1.35);
    -webkit-backdrop-filter: blur(18px) saturate(1.35);
}

.glass::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), transparent 38%);
    opacity: 0.55;
}

/* 画面上部に浮くナビ */
.nav-float {
    position: fixed;
    z-index: 20;
    top: 0.9rem;
    left: 50%;
    width: min(1120px, calc(100% - 1.25rem));
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.4rem 0.45rem 0.4rem 0.85rem;
    border-radius: 999px;
}

.wordmark {
    position: relative;
    z-index: 1;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: -0.03em;
    font-size: 0.95rem;
}

.wordmark span {
    color: var(--accent);
}

.nav-float > nav {
    position: relative;
    z-index: 1;
    margin-right: auto;
}

.nav-links {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 0.15rem;
    list-style: none;
}

.nav-link {
    display: block;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 500;
    padding: 0.45rem 0.7rem;
    border-radius: 999px;
    transition: color 0.25s ease, background-color 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.nav-tools {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.social-link,
.quality-toggle {
    width: 2.15rem;
    height: 2.15rem;
    display: grid;
    place-items: center;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--line-soft);
    transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.quality-toggle {
    width: auto;
    padding: 0 0.75rem;
    cursor: pointer;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.social-link:hover,
.quality-toggle:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.45);
}

.social-link img {
    width: 1.15rem;
    height: 1.15rem;
    border-radius: 0.25rem;
}

main {
    position: relative;
    z-index: 1;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--nav-offset) 6vw 4rem;
}

.hero-copy {
    width: min(30rem, 46vw);
    animation: rise-in 0.9s ease both;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-bottom: 1.1rem;
    color: var(--accent-strong);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.16em;
}

.live-dot {
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent);
    animation: pulse 2.8s ease-in-out infinite;
}

.hero h1,
.page-title {
    font-family: var(--font-display);
    font-weight: 500;
    letter-spacing: -0.03em;
    line-height: 0.92;
}

.hero h1 {
    font-size: clamp(3.4rem, 7.4vw, 6.6rem);
    text-shadow: 0 10px 30px rgba(0, 10, 20, 0.28);
}

.hero h1 em {
    font-style: italic;
    font-weight: 500;
}

.lede,
.page-subtitle,
.intro-text {
    color: var(--text-secondary);
}

.lede {
    margin-top: 1.15rem;
    font-size: 1.05rem;
    letter-spacing: 0.01em;
}

.hero-actions,
.link-row,
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.hero-actions {
    margin-top: 1.8rem;
}

.btn,
.project-link,
.contact-link {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 2.7rem;
    padding: 0.55rem 1.15rem;
    border-radius: 999px;
    text-decoration: none;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.32);
    backdrop-filter: blur(12px);
    transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.btn-primary {
    background: rgba(170, 230, 255, 0.18);
}

.btn:hover,
.project-link:hover,
.contact-link:hover {
    transform: translateY(-2px);
    background: rgba(190, 236, 255, 0.24);
    border-color: rgba(255, 255, 255, 0.55);
}

section[id] {
    scroll-margin-top: 5.5rem;
}

.band {
    padding: 2rem 6vw 5rem;
}

.band-inner,
.page-wrap {
    width: min(var(--site-max), 100%);
    margin: 0 auto;
}

.page-main {
    padding: 7.5rem 6vw 4rem;
}

.page-header,
.section-heading {
    max-width: 40rem;
    margin-bottom: 1.75rem;
}

.page-kicker,
.section-kicker {
    margin-bottom: 0.45rem;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 650;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.page-title,
.section-heading h2 {
    font-size: clamp(2.6rem, 6vw, 4.4rem);
}

.page-subtitle,
.section-heading p,
.intro-text {
    margin-top: 0.8rem;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: none;
}

.visitor-counter {
    display: flex;
    justify-content: center;
    padding: 0 1rem 4rem;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.visitor-counter.visible {
    opacity: 1;
    transform: none;
}

.visitor-counter .counter-image {
    width: min(420px, 90vw);
    height: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line-soft);
}

.closing-line {
    margin-top: 2.5rem;
    text-align: center;
    font-family: var(--font-display);
    font-style: italic;
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    text-shadow: 0 8px 24px rgba(0, 16, 32, 0.35);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #03111d;
}

::-webkit-scrollbar-thumb {
    background: rgba(155, 231, 255, 0.45);
    border-radius: 4px;
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes pulse {
    0%,
    100% {
        opacity: 0.4;
    }
    50% {
        opacity: 1;
    }
}

@media (max-width: 800px) {
    .nav-float {
        top: 0.45rem;
        flex-wrap: wrap;
        justify-content: center;
        border-radius: 1.2rem;
        padding: 0.45rem;
    }

    .nav-float > nav {
        order: 3;
        width: 100%;
        margin-right: 0;
    }

    .nav-links {
        width: 100%;
        justify-content: center;
    }

    .nav-link {
        padding: 0.35rem 0.55rem;
        font-size: 0.84rem;
    }

    .hero {
        align-items: flex-start;
        padding-top: 8.5rem;
    }

    .hero h1 {
        font-size: clamp(2.8rem, 14vw, 4.2rem);
    }

    .world-photo {
        background-position: center calc(78% - var(--scroll) * 16px);
    }

    .world-scrim {
        background: linear-gradient(180deg, rgba(3, 14, 28, 0.2) 0%, rgba(3, 14, 28, 0.18) 42%, rgba(3, 14, 28, 0.72) 100%);
    }
}

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

    .hero-copy,
    .live-dot,
    [data-reveal] {
        animation: none;
        opacity: 1;
        transform: none;
        transition: none;
    }

    .world-photo {
        background-position: 70% 64%;
    }
}