:root {
    --bg: #fafaf9;
    --ink: #0f172a;
    --mid: #334155;
    --mute: #94a3b8;
    --gold: #8a7040;
    --navy: #2e3a6e;
    --coral: #b04050;
    --white: #ffffff;
    --glass-bg-strong: rgba(255, 255, 255, 0.92);
    --glass-bg-medium: rgba(255, 255, 255, 0.75);
    --glass-bg-soft: rgba(255, 255, 255, 0.55);
    --glass-bg-faint: rgba(255, 255, 255, 0.35);
    --glass-border-soft: rgba(0, 0, 0, 0.08);
    --glass-border-faint: rgba(0, 0, 0, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
    --glass-shadow-modal: 0 8px 40px rgba(0, 0, 0, 0.12);

    --serif-en: "EB Garamond", "Georgia", serif;
    --serif-jp: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
    --sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;

    /* Glow color RGB — adjustable via ?dev panel */
    --glow-r: 255;  --glow-g: 255;  --glow-b: 253;

    /* Glow radii (px) — adjustable via ?dev panel */
    --glow-h-r1: 14;  --glow-h-r2: 30;  --glow-h-r3: 60;
    --glow-t-r1: 35;  --glow-t-r2: 53;  --glow-t-r3: 2;  --glow-t-r4: 2;  --glow-t-r5: 8;
    --glow-c-r1: 10;  --glow-c-r2: 22;  --glow-c-r3: 44;
    /* Glow opacity (0-1) */
    --glow-h-a3: 0.7;
    --glow-t-a3: 1;  --glow-t-a4: 0.8;  --glow-t-a5: 0.95;
    --glow-c-a3: 0.6;
    /* Card panel */
    --card-bg-alpha: 0.3;
    --card-blur: 6;
    --card-border-alpha: 0.3;
}

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

body {
    font-family: var(--sans);
    background: transparent;
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Headings: text-shadow only, no panel */
.glow-heading {
    text-shadow:
        0 0 calc(var(--glow-h-r1) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-h-r2) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-h-r3) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-h-a3));
}

/* Text glow — テキストをグローだけで読ませる */
.glow-text,
.glow-text p,
.glow-text li,
.glow-text span {
    text-shadow:
        0 0 calc(var(--glow-t-r1) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-t-r2) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-t-r3) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-t-a3)),
        0 0 calc(var(--glow-t-r4) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-t-a4)),
        0 0 calc(var(--glow-t-r5) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-t-a5));
}

/* Card — 情報のまとまりを示すパネル */
.glow-card {
    background: rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--card-bg-alpha));
    backdrop-filter: blur(calc(var(--card-blur) * 1px));
    -webkit-backdrop-filter: blur(calc(var(--card-blur) * 1px));
    border: 1px solid rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--card-border-alpha));
    border-radius: 6px;
    padding: 2rem;
}
.glow-card p,
.glow-card li,
.glow-card h3,
.glow-card span {
    text-shadow:
        0 0 calc(var(--glow-c-r1) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-c-r2) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-c-r3) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-c-a3));
}

/* Link — コンパクト、下線、ホバーで光る */
.glow-link {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.glow-link span {
    text-shadow:
        0 0 calc(var(--glow-c-r1) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-c-r2) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b),1),
        0 0 calc(var(--glow-c-r3) * 1px) rgba(var(--glow-r),var(--glow-g),var(--glow-b), var(--glow-c-a3));
}
.glow-link:hover {
    background: rgba(255, 255, 255, 0.3);
    border-bottom-color: rgba(0, 0, 0, 0.15);
    padding-left: 1.75rem;
}

/* ============================================ */

/* === WebGL placeholder === */
#webgl-container {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    z-index: 0;
    pointer-events: none;
}

/* === Content Layer === */
#content {
    position: relative;
    z-index: 1;
    background: transparent;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* === Top Bar === */
.top-bar {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* === Menu Toggle === */
.menu-toggle {
    background: var(--glass-bg-medium);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border-soft);
    border-radius: 2rem;
    padding: 0.35rem 0.85rem;
    cursor: pointer;
    font-family: var(--serif-en);
    font-size: 1rem;
    letter-spacing: 0.05em;
    color: var(--mute);
    transition: all 0.3s ease;
}

.menu-toggle:hover {
    color: var(--ink);
}

/* === Dropdown Menu === */
.site-menu {
    position: fixed;
    top: 4rem;
    right: 1.5rem;
    z-index: 99;
    background: var(--glass-bg-strong);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 0.5rem;
    padding: 0.75rem 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--glass-shadow);
}

.site-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.site-menu a {
    display: block;
    padding: 0.6rem 1.25rem;
    font-family: var(--serif-en);
    font-size: 1rem;
    font-weight: 400;
    color: var(--mid);
    text-decoration: none;
    transition: all 0.2s ease;
}

.site-menu a:hover {
    color: var(--ink);
    background: rgba(0, 0, 0, 0.02);
}

.site-menu .menu-label {
    display: block;
    padding: 0.3rem 1.25rem 0.5rem;
    font-family: var(--serif-en);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--mute);
}

.site-menu .menu-current {
    color: var(--ink);
    font-weight: 500;
}

.site-menu hr {
    border: none;
    border-top: 1px solid rgba(0, 0, 0, 0.04);
    margin: 0.5rem 0;
}

/* === Lang Toggle === */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--glass-bg-medium);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border-soft);
    border-radius: 2rem;
    padding: 0.25rem;
    font-family: var(--serif-en);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

.lang-toggle button {
    border: none;
    background: transparent;
    padding: 0.35rem 0.95rem;
    border-radius: 1.5rem;
    cursor: pointer;
    font-family: var(--serif-en);
    font-size: 1rem;
    letter-spacing: 0.05em;
    color: var(--mute);
    transition: all 0.3s ease;
}

.lang-toggle button.active {
    background: var(--ink);
    color: var(--white);
}

.lang-toggle button:hover:not(.active) {
    color: var(--ink);
}

/* === Hero === */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 6rem 0;
}

.hero-label {
    font-family: var(--serif-en);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    color: var(--coral);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-family: var(--serif-en);
    font-size: clamp(3.5rem, 10vw, 6rem);
    font-weight: 400;
    font-style: normal;
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--ink);
    margin-bottom: 3rem;
}

.hero-notice {
    max-width: 680px;
}

/* === Sections === */
section {
    min-height: 100vh;
    padding: 8rem 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* === Section Header === */
.section-label {
    font-family: var(--serif-en);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--mute);
    margin-bottom: 0.75rem;
}

h2 {
    font-family: var(--serif-jp);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 2.5rem;
    line-height: 1.3;
}

h3 {
    font-family: var(--sans);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--ink);
    margin-bottom: 1rem;
}

p {
    font-family: var(--sans);
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 2;
    color: var(--mid);
    margin-bottom: 1.5rem;
}

p:last-child { margin-bottom: 0; }

/* === Prose blocks (shared style) === */
.prose-block p,
.about-modal__body,
.about-modal__body p {
    font-family: var(--serif-jp);
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 2.1;
    color: var(--mid);
}

/* === Overview === */
.overview-text {
    max-width: 680px;
    margin-bottom: 3rem;
}

/* === Grid === */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .grid { grid-template-columns: 1fr; }
}

/* === Cards === */
.card h3 {
    color: var(--gold);
}

.card p {
    font-size: 1rem;
}

.card ul {
    list-style: none;
    margin: 0;
}

.card ul li {
    font-size: 1rem;
    font-weight: 300;
    color: var(--mid);
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 1px;
    background: var(--mute);
}

/* === Pill Links === */
.pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
    margin-top: 2rem;
}

.pill {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    font-family: var(--sans);
    font-size: 1rem;
    font-weight: 400;
    text-decoration: none;
    letter-spacing: 0.03em;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(4px);
}

.pill--doing {
    color: var(--coral);
    border: 1px solid rgba(176, 64, 80, 0.3);
}
.pill--doing:hover {
    background: var(--coral);
    color: #fff;
    border-color: var(--coral);
}

.pill--being {
    color: var(--navy);
    border: 1px solid rgba(46, 58, 110, 0.3);
}
.pill--being:hover {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
}

/* === Being description === */
.being-desc {
    max-width: 680px;
    margin-bottom: 2rem;
}

/* === Repos === */
.repo-card {
    display: block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.repo-card__title {
    display: block;
    font-family: var(--serif-en);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--ink);
}

.repo-card__desc {
    display: block;
    font-size: 1rem;
    font-weight: 300;
    color: var(--mute);
    margin-top: 0.5rem;
}

.repo-grid {
    margin-top: 3rem;
}

/* === Future === */
.future-text {
    max-width: 680px;
}

/* === Footer === */
footer {
    padding: 5rem 0 3rem;
    text-align: center;
}

footer a {
    font-family: var(--serif-en);
    font-size: 1rem;
    font-weight: 400;
    color: var(--mute);
    text-decoration: none;
    margin: 0 1.25rem;
    letter-spacing: 0.05em;
    transition: color 0.3s ease;
}

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

/* === About Trigger === */
.about-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--glass-bg-faint);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--ink);
    cursor: pointer;
    margin-top: 2rem;
    transition: all 0.3s ease;
    border: 1px solid var(--glass-border-faint);
}
.about-trigger__letter {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 1.25rem;
    font-weight: 400;
    line-height: 1;
    pointer-events: none;
}
.about-trigger:hover {
    color: var(--ink);
    background: var(--glass-bg-soft);
}

/* === About Modal === */
.about-modal {
    position: fixed;
    inset: 0;
    z-index: 150;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.about-modal.open {
    opacity: 1;
    visibility: visible;
}
.about-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.6);
}
.about-modal__panel {
    position: relative;
    max-width: 560px;
    width: calc(100% - 3rem);
    max-height: 80vh;
    overflow-y: auto;
    padding: 2.5rem;
    border-radius: 10px;
    background: var(--white);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: var(--glass-shadow-modal);
}
.about-modal__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border-faint);
    background: var(--glass-bg-faint);
    color: var(--ink);
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.2s ease;
}
.about-modal__close:hover {
    color: var(--ink);
    background: var(--glass-bg-soft);
}
.about-modal__body h1 {
    font-family: var(--serif-en);
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin-bottom: 1.5rem;
}
.about-modal__body h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}
.about-modal__body hr {
    border: none;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    margin: 1.5rem 0;
}
/* === Visually Hidden (SEO) === */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* === Responsive === */

/* md: tablet */
@media (max-width: 768px) {
    .container { padding: 0 1.5rem; }
    .hero h1 { font-size: 3rem; }
    h2 { font-size: 2rem; }
    section { padding: 5rem 0; min-height: auto; }
    .glow-card { padding: 1.5rem; }
    .glow-link { padding: 1rem 1.5rem; }
    .top-bar { top: 1rem; right: 1rem; }
    .site-menu { top: 3.5rem; right: 1rem; }
    .prose-block { max-width: 100%; }
}

/* sm: smartphone */
@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .hero { padding: 4rem 0; }
    .hero h1 { font-size: 2.5rem; margin-bottom: 2rem; }
    h2 { font-size: 1.5rem; margin-bottom: 1.5rem; }
    section { padding: 3rem 0; }
    .glow-card { padding: 1.25rem; }
    .glow-link { padding: 0.75rem 1rem; }
    .pills { gap: 0.5rem; }
    footer a { margin: 0 0.75rem; font-size: 1rem; }
    .about-modal__panel { width: calc(100% - 1.5rem); padding: 1.5rem; }
}

/* Touch targets: min 44px */
.pill,
.glow-link,
.menu-toggle,
.lang-toggle button,
.about-trigger,
.about-modal__close {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}