:root {
    --bg-dark: #060f1b;
    --bg-mid: #122744;
    --bg-soft: #eef5fb;
    --surface: rgba(247, 251, 255, 0.94);
    --surface-soft: rgba(224, 236, 247, 0.88);
    --surface-strong: rgba(255, 255, 255, 0.98);
    --ink: #11243d;
    --muted: #566d84;
    --line: rgba(17, 36, 61, 0.12);
    --accent: #55d0ff;
    --accent-strong: #146f99;
    --accent-soft: #c3efff;
    --warm: #ffc46d;
    --warm-strong: #cb7524;
    --shadow: 0 28px 68px rgba(2, 11, 28, 0.18);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: "IBM Plex Sans JP", sans-serif;
    background:
        radial-gradient(circle at 16% 14%, rgba(85, 208, 255, 0.2), transparent 18%),
        radial-gradient(circle at 84% 16%, rgba(255, 196, 109, 0.18), transparent 20%),
        linear-gradient(180deg, #060f1b 0%, #122744 16%, #e7eff7 16.1%, #fbfdff 100%);
    min-height: 100vh;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        radial-gradient(circle at 12% 22%, rgba(255, 255, 255, 0.16) 0 1px, transparent 1.5px),
        radial-gradient(circle at 78% 16%, rgba(255, 255, 255, 0.12) 0 1px, transparent 1.5px),
        radial-gradient(circle at 66% 68%, rgba(255, 255, 255, 0.14) 0 1px, transparent 1.5px),
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 340px 340px, 280px 280px, 400px 400px, 44px 44px, 44px 44px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.14));
}

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

button,
input {
    font: inherit;
}

canvas {
    display: block;
    width: 100%;
    height: auto;
}

.page-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding-bottom: 82px;
}

.site-header {
    position: sticky;
    top: 14px;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin: 18px 0 20px;
    padding: 16px 22px;
    border-radius: 999px;
    background: rgba(7, 16, 29, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(18px);
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.22);
}

.brand {
    color: #f2f8ff;
    font-family: "Shippori Mincho", serif;
    font-size: 1.14rem;
    letter-spacing: 0.1em;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 18px;
    color: rgba(242, 248, 255, 0.82);
    font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.footer-links a:hover,
.footer-links a:focus-visible {
    color: white;
}

.section,
.signal-strip,
.site-footer {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.is-visible,
.site-footer.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 24px;
    padding: 34px 0 22px;
}

.hero-copy,
.hero-panel,
.concept-card,
.formula-card,
.case-card,
.comparison-card,
.model-card,
.timeline-card,
.demo-panel,
.status-card,
.link-card,
.signal-strip,
.hero-note {
    border: 1px solid rgba(255, 255, 255, 0.68);
    background: var(--surface);
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}

.hero-copy {
    min-width: 0;
    padding: 42px 32px 42px 38px;
    border-radius: 38px;
    position: relative;
    overflow: hidden;
}

.hero-copy::after {
    content: "";
    position: absolute;
    inset: auto -56px -118px auto;
    width: 340px;
    height: 340px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(195, 239, 255, 0.54), rgba(195, 239, 255, 0));
}

.hero-panel {
    min-width: 0;
    padding: 26px;
    border-radius: 36px;
    display: grid;
    gap: 18px;
    background: rgba(212, 226, 241, 0.28);
}

.eyebrow,
.card-label,
.signal-kicker,
.support-title {
    margin: 0 0 12px;
    color: var(--accent-strong);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

h1,
h2,
h3,
.brand,
.formula-block,
.signal-main,
.canvas-caption strong {
    font-family: "Shippori Mincho", serif;
}

h1,
h2,
h3,
.brand {
    line-height: 1.15;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(2.65rem, 5vw, 4.7rem);
    letter-spacing: -0.04em;
}

h2 {
    margin-bottom: 0;
    font-size: clamp(2rem, 3.8vw, 3.15rem);
    letter-spacing: -0.03em;
}

h3 {
    margin-bottom: 10px;
    font-size: 1.34rem;
}

.hero-lead,
.section-heading p,
.concept-card p,
.formula-card p,
.case-card p,
.comparison-card p,
.model-card p,
.timeline-card p,
.hero-note p,
.demo-note,
.canvas-caption,
.status-card p,
.link-card p,
.site-footer p,
.signal-sub {
    color: var(--muted);
}

.hero-lead {
    margin: 20px 0 0;
    font-size: 1.04rem;
    line-height: 1.85;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 28px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 22px;
    border-radius: 999px;
    border: 1px solid transparent;
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
    cursor: pointer;
}

.button:hover,
.button:focus-visible,
.mode-chip:hover,
.mode-chip:focus-visible {
    transform: translateY(-2px);
}

.button-primary {
    color: #f8fdff;
    background: linear-gradient(135deg, #0e719d, #55d0ff);
    box-shadow: 0 14px 30px rgba(13, 95, 137, 0.22);
}

.button-secondary {
    color: var(--ink);
    border-color: rgba(17, 36, 61, 0.12);
    background: rgba(255, 255, 255, 0.72);
}

.hero-points {
    list-style: none;
    padding: 0;
    margin: 26px 0 0;
    display: grid;
    gap: 12px;
}

.hero-points li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    line-height: 1.7;
}

.hero-points li::before {
    content: "";
    width: 9px;
    height: 9px;
    margin-top: 0.55em;
    border-radius: 50%;
    flex: 0 0 auto;
    background: linear-gradient(135deg, var(--accent), var(--warm));
    box-shadow: 0 0 18px rgba(85, 208, 255, 0.4);
}

.cosmic-window {
    position: relative;
    min-height: 318px;
    border-radius: 30px;
    overflow: hidden;
    background:
        radial-gradient(circle at 48% 48%, rgba(111, 202, 244, 0.18), transparent 20%),
        radial-gradient(circle at 76% 30%, rgba(255, 196, 109, 0.14), transparent 22%),
        linear-gradient(180deg, #061120 0%, #0c1d33 44%, #16345a 100%);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.cosmic-window::before,
.cosmic-window::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.cosmic-window::before {
    inset: 9% 18%;
    border: 1px solid rgba(181, 239, 255, 0.16);
}

.cosmic-window::after {
    inset: 24% 30%;
    background: radial-gradient(circle, rgba(195, 239, 255, 0.24), rgba(195, 239, 255, 0));
    filter: blur(18px);
}

.deep-field,
.observable-ring,
.grid-shell,
.signal-wave,
.mini-galaxy,
.window-label {
    position: absolute;
}

.deep-field {
    inset: 0;
    background:
        radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.18) 0 1px, transparent 1.6px),
        radial-gradient(circle at 72% 20%, rgba(255, 255, 255, 0.14) 0 1px, transparent 1.7px),
        radial-gradient(circle at 64% 72%, rgba(255, 255, 255, 0.14) 0 1px, transparent 1.7px),
        radial-gradient(circle at 42% 34%, rgba(85, 208, 255, 0.16), rgba(85, 208, 255, 0));
    background-size: 140px 140px, 180px 180px, 220px 220px, auto;
}

.observable-ring {
    border-radius: 50%;
}

.ring-inner {
    inset: 23% 28%;
    border: 1px solid rgba(195, 239, 255, 0.84);
    box-shadow: inset 0 0 38px rgba(85, 208, 255, 0.12), 0 0 42px rgba(85, 208, 255, 0.18);
    animation: pulse-ring 7.2s ease-in-out infinite;
}

.ring-outer {
    inset: 9% 13%;
    border: 1px dashed rgba(255, 255, 255, 0.34);
    animation: spin-slow 24s linear infinite;
}

.grid-shell {
    inset: 16% 20%;
    border-radius: 50%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 24px 24px;
    mask-image: radial-gradient(circle, rgba(0, 0, 0, 0.9) 58%, rgba(0, 0, 0, 0));
    opacity: 0.42;
}

.signal-wave {
    border-radius: 999px;
    border: 1px solid rgba(255, 196, 109, 0.3);
    background: linear-gradient(90deg, rgba(255, 196, 109, 0.12), rgba(255, 196, 109, 0));
}

.wave-a {
    width: 186px;
    height: 54px;
    left: 8%;
    bottom: 14%;
    transform: rotate(-12deg);
    animation: float-drift 8.4s ease-in-out infinite;
}

.wave-b {
    width: 210px;
    height: 64px;
    right: 8%;
    top: 18%;
    transform: rotate(12deg);
    animation: float-drift 9.6s ease-in-out infinite reverse;
}

.mini-galaxy {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(255, 248, 228, 1), rgba(255, 196, 109, 0.18));
    box-shadow: 0 0 14px rgba(255, 212, 137, 0.34);
    animation: galaxy-drift 10s ease-in-out infinite;
}

.galaxy-a { top: 18%; left: 22%; }
.galaxy-b { top: 24%; left: 68%; animation-delay: -1.8s; }
.galaxy-c { top: 38%; left: 78%; animation-delay: -3.1s; }
.galaxy-d { top: 58%; left: 16%; animation-delay: -4.5s; }
.galaxy-e { top: 66%; left: 32%; animation-delay: -2.2s; }
.galaxy-f { top: 72%; left: 74%; animation-delay: -5.4s; }
.galaxy-g { top: 42%; left: 48%; animation-delay: -6.2s; }
.galaxy-h { top: 16%; left: 50%; animation-delay: -7s; }

.window-label {
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(7, 16, 29, 0.74);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(244, 249, 255, 0.84);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.label-observable {
    top: 14%;
    left: 12%;
}

.label-beyond {
    right: 8%;
    bottom: 16%;
}

.label-time {
    left: 44%;
    bottom: 10%;
}

.hero-note-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.hero-note,
.concept-card,
.formula-card,
.case-card,
.comparison-card,
.model-card,
.timeline-card,
.status-card,
.link-card {
    border-radius: 26px;
    padding: 22px 22px 20px;
}

.hero-note {
    min-height: 176px;
}

.strong-card,
.strong-note {
    background: linear-gradient(145deg, rgba(238, 248, 255, 0.98), rgba(216, 235, 248, 0.92));
}

.warm-card,
.warm-note {
    background: linear-gradient(145deg, rgba(255, 246, 226, 0.98), rgba(255, 229, 173, 0.92));
}

.night-card,
.night-note {
    border-color: rgba(255, 255, 255, 0.12);
    background: linear-gradient(160deg, rgba(8, 18, 32, 0.97), rgba(23, 41, 66, 0.93));
}

.night-card h3,
.night-card h2,
.night-note h2,
.night-card .card-label,
.night-note .card-label,
.night-card .formula-block,
.night-note .formula-block,
.status-card.night-card h3,
.link-card.night-card h3 {
    color: rgba(245, 249, 255, 0.96);
}

.night-card p,
.night-card li,
.night-note p,
.status-card.night-card p,
.link-card.night-card p {
    color: rgba(219, 230, 244, 0.84);
}

.signal-strip {
    position: relative;
    overflow: hidden;
    margin: 10px 0 16px;
    padding: 24px 28px;
    border-radius: 32px;
    background: linear-gradient(135deg, rgba(7, 16, 29, 0.96), rgba(18, 39, 68, 0.92));
    color: #edf6ff;
    display: grid;
    gap: 8px;
}

.signal-strip::after {
    content: "";
    position: absolute;
    inset: auto -80px -120px auto;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(85, 208, 255, 0.18), rgba(85, 208, 255, 0));
}

.signal-kicker {
    margin-bottom: 2px;
    color: rgba(195, 239, 255, 0.82);
}

.signal-main {
    margin: 0;
    font-size: clamp(1.5rem, 3vw, 2.34rem);
    line-height: 1.2;
}

.signal-sub {
    margin: 0;
    color: rgba(232, 241, 251, 0.82);
    line-height: 1.8;
}

.section {
    padding: 38px 0 4px;
}

.section-heading {
    max-width: 820px;
    display: grid;
    gap: 10px;
    margin-bottom: 24px;
}

.section-heading p {
    margin-bottom: 0;
    line-height: 1.85;
}

.concept-grid,
.case-grid,
.comparison-grid,
.model-grid,
.timeline-grid,
.link-grid,
.status-panel {
    display: grid;
    gap: 16px;
}

.concept-grid,
.case-grid,
.model-grid,
.timeline-grid,
.link-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.comparison-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    margin-top: 18px;
}

.formula-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 18px;
}

.formula-block {
    margin-bottom: 12px;
    font-size: clamp(1.04rem, 1.9vw, 1.4rem);
    color: var(--ink);
    line-height: 1.6;
}

.comparison-card,
.timeline-card,
.case-card,
.model-card,
.concept-card,
.link-card {
    min-height: 198px;
}

.demo-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.22fr) minmax(280px, 0.78fr);
    gap: 18px;
    align-items: start;
}

.demo-panel {
    border-radius: 32px;
    padding: 24px;
}

.mode-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.mode-chip {
    min-height: 44px;
    padding: 0 18px;
    border-radius: 999px;
    border: 1px solid rgba(17, 36, 61, 0.12);
    background: rgba(255, 255, 255, 0.7);
    color: var(--ink);
    cursor: pointer;
    transition: transform 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.mode-chip.is-active {
    color: #f7fcff;
    border-color: transparent;
    background: linear-gradient(135deg, #0e719d, #55d0ff);
    box-shadow: 0 14px 30px rgba(13, 95, 137, 0.22);
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.control {
    display: grid;
    gap: 10px;
    padding: 16px 18px;
    border-radius: 24px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.66);
}

.control span {
    color: var(--muted);
}

.control strong {
    color: var(--ink);
    font-size: 1.08rem;
}

.control input[type="range"] {
    width: 100%;
    accent-color: var(--accent-strong);
}

.canvas-frame {
    margin-top: 18px;
    padding: 14px;
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(8, 18, 32, 0.98), rgba(15, 32, 52, 0.96));
    border: 1px solid rgba(255, 255, 255, 0.08);
}

#universeCanvas {
    border-radius: 22px;
    background: #050b14;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.canvas-caption,
.demo-note {
    margin-bottom: 0;
    line-height: 1.75;
}

.canvas-caption {
    margin-top: 14px;
}

.demo-note {
    margin-top: 12px;
}

.status-panel {
    grid-template-columns: 1fr;
}

.status-card {
    min-height: 120px;
}

.status-card h3,
.link-card h3 {
    font-size: 1.14rem;
}

.link-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-card .button {
    margin-top: auto;
}

.site-footer {
    margin-top: 38px;
    padding: 30px 32px;
    border-radius: 34px;
    background: rgba(7, 16, 29, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
}

.site-footer p {
    color: rgba(232, 241, 251, 0.84);
    line-height: 1.8;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
    color: rgba(232, 241, 251, 0.84);
}

.footer-links a {
    transition: color 180ms ease;
}

@keyframes pulse-ring {
    0%,
    100% {
        transform: scale(0.98);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.02);
        opacity: 1;
    }
}

@keyframes spin-slow {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes float-drift {
    0%,
    100% {
        transform: translateY(0) rotate(-12deg);
    }
    50% {
        transform: translateY(-8px) rotate(-7deg);
    }
}

@keyframes galaxy-drift {
    0%,
    100% {
        transform: translate3d(0, 0, 0) scale(0.96);
    }
    50% {
        transform: translate3d(6px, -8px, 0) scale(1.08);
    }
}

@media (max-width: 1024px) {
    .hero,
    .demo-grid {
        grid-template-columns: 1fr;
    }

    .status-panel {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .page-shell {
        width: min(100%, calc(100% - 20px));
    }

    .site-header {
        border-radius: 28px;
        padding: 16px 18px;
        align-items: flex-start;
        flex-direction: column;
    }

    .hero-copy,
    .hero-panel,
    .demo-panel,
    .site-footer {
        border-radius: 28px;
    }

    .hero-copy {
        padding: 34px 24px 34px 26px;
    }

    .hero-panel,
    .demo-panel {
        padding: 20px;
    }

    .hero-note-grid,
    .control-grid,
    .status-panel {
        grid-template-columns: 1fr;
    }

    .mode-row {
        gap: 8px;
    }

    .mode-chip,
    .button {
        width: 100%;
    }

    .cosmic-window {
        min-height: 270px;
    }

    .window-label {
        font-size: 0.72rem;
    }
}