:root {
    --bg-dark: #09141d;
    --bg-deep: #16465a;
    --surface: rgba(255, 250, 243, 0.9);
    --surface-soft: rgba(235, 245, 247, 0.84);
    --surface-warm: rgba(255, 243, 223, 0.9);
    --ink: #1c2732;
    --muted: #65717b;
    --line: rgba(28, 39, 50, 0.1);
    --accent: #236f7a;
    --accent-strong: #16465a;
    --accent-warm: #ce8748;
    --shadow: 0 28px 60px rgba(9, 20, 29, 0.18);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: "IBM Plex Sans JP", sans-serif;
    background:
        radial-gradient(circle at 12% 12%, rgba(206, 135, 72, 0.2), transparent 20%),
        radial-gradient(circle at 86% 10%, rgba(35, 111, 122, 0.2), transparent 18%),
        linear-gradient(180deg, #071119 0%, #173e52 16%, #efe7dc 16.1%, #f6f0e7 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    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: 50px 50px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.08));
}

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

button {
    font: inherit;
}

.page-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding-bottom: 80px;
}

.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, 17, 25, 0.76);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(18px);
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.22);
}

.brand,
h1,
h2,
h3,
.signal-main,
.footer-title {
    font-family: "Shippori Mincho", serif;
}

.brand {
    color: #f7efe1;
    font-size: 1.14rem;
    letter-spacing: 0.08em;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 18px;
    color: rgba(247, 239, 225, 0.84);
    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: 1;
    transform: none;
    transition: none;
}

.reveal.is-visible,
.site-footer.is-visible {
    opacity: 1;
    transform: none;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 0.96fr) minmax(0, 1.04fr);
    gap: 24px;
    padding: 34px 0 20px;
}

.hero-copy,
.hero-panel,
.signal-strip,
.featured-card,
.simulation-card,
.route-card,
.next-card,
.site-footer,
.hero-note {
    border: 1px solid rgba(255, 255, 255, 0.56);
    background: var(--surface);
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}

.hero-copy {
    min-width: 0;
    padding: 40px 32px 40px 36px;
    border-radius: 38px;
    position: relative;
    overflow: hidden;
}

.hero-copy::after {
    content: "";
    position: absolute;
    inset: auto -70px -124px auto;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(206, 135, 72, 0.44), rgba(206, 135, 72, 0));
}

.hero-panel {
    min-width: 0;
    padding: 28px;
    border-radius: 36px;
    display: grid;
    gap: 18px;
    background: rgba(244, 248, 252, 0.16);
}

.hero-note {
    padding: 22px;
    border-radius: 24px;
}

.eyebrow,
.card-label,
.signal-kicker {
    margin: 0 0 12px;
    color: var(--accent-strong);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

h1,
h2,
h3,
.brand {
    line-height: 1.14;
}

h1,
h2 {
    margin: 0;
}

h1 {
    font-size: clamp(2.7rem, 5vw, 4.8rem);
    letter-spacing: -0.04em;
}

.hero-lead,
.section-heading p,
.hero-note p,
.featured-card p,
.simulation-card p,
.route-card p,
.next-card p,
.signal-sub,
.site-footer p,
.hero-points,
.route-card ol {
    color: var(--muted);
}

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

.hero-actions,
.hero-points,
.footer-links,
.card-tags,
.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-actions {
    margin-top: 28px;
}

.hero-points {
    margin: 24px 0 0;
    padding-left: 1.2rem;
    display: grid;
    gap: 10px;
    position: relative;
    z-index: 1;
}

.button,
.filter-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 22px;
    border-radius: 999px;
    border: 1px solid transparent;
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover,
.button:focus-visible,
.filter-chip:hover,
.filter-chip:focus-visible,
.simulation-card:hover,
.simulation-card:focus-within,
.featured-card:hover,
.featured-card:focus-within,
.route-card:hover,
.route-card:focus-within,
.next-card:hover,
.next-card:focus-within {
    transform: translateY(-2px);
}

.button-primary {
    color: white;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    box-shadow: 0 14px 28px rgba(22, 70, 90, 0.28);
}

.button-secondary,
.filter-chip {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--line);
}

.filter-chip {
    cursor: pointer;
    min-height: 44px;
    padding: 0 16px;
}

.filter-chip.is-active {
    color: white;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    border-color: transparent;
    box-shadow: 0 14px 28px rgba(22, 70, 90, 0.2);
}

.signal-strip {
    padding: 24px 28px;
    border-radius: 28px;
}

.signal-kicker {
    margin-bottom: 10px;
}

.signal-main {
    margin: 0;
    font-size: clamp(1.5rem, 2.7vw, 2.35rem);
}

.signal-sub {
    margin: 12px 0 0;
    max-width: 900px;
    line-height: 1.8;
}

.section {
    padding-top: 62px;
}

.section-heading {
    max-width: 760px;
}

.section-heading h2 {
    font-size: clamp(2rem, 3.4vw, 3rem);
    letter-spacing: -0.03em;
}

.section-heading p:last-child {
    margin: 16px 0 0;
    line-height: 1.8;
}

.featured-grid,
.catalog-grid,
.route-grid,
.next-grid {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.featured-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.catalog-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.route-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.featured-card,
.simulation-card,
.route-card,
.next-card {
    padding: 24px;
    border-radius: 28px;
}

.featured-card,
.simulation-card {
    display: flex;
    flex-direction: column;
}

.card-snapshot {
    position: relative;
    aspect-ratio: 16 / 9;
    margin-bottom: 18px;
    overflow: hidden;
    border-radius: 22px;
    border: 1px solid rgba(22, 70, 90, 0.12);
    background:
        linear-gradient(135deg, rgba(35, 111, 122, 0.18), rgba(206, 135, 72, 0.18)),
        linear-gradient(180deg, rgba(255, 255, 255, 0.84), rgba(231, 240, 243, 0.84));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.52);
}

.card-snapshot::after {
    content: "Snapshot";
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(7, 17, 25, 0.72);
    color: rgba(247, 239, 225, 0.92);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    z-index: 1;
}

.card-snapshot img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform 220ms ease;
}

.featured-card:hover .card-snapshot img,
.featured-card:focus-within .card-snapshot img,
.simulation-card:hover .card-snapshot img,
.simulation-card:focus-within .card-snapshot img {
    transform: scale(1.03);
}

.feature-primary .card-snapshot {
    border-color: rgba(255, 255, 255, 0.18);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.04)),
        linear-gradient(180deg, rgba(35, 111, 122, 0.48), rgba(22, 70, 90, 0.44));
}

.feature-primary .card-snapshot::after {
    background: rgba(255, 255, 255, 0.18);
    color: #f7fbff;
}

.card-tags {
    margin-top: 16px;
}

.card-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid rgba(22, 70, 90, 0.1);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-strong);
}

.simulation-card.is-hidden {
    display: none;
}

.feature-primary {
    background: linear-gradient(180deg, rgba(22, 70, 90, 0.96), rgba(35, 111, 122, 0.88));
    color: #f7fbff;
}

.feature-primary p,
.feature-primary .card-label {
    color: rgba(239, 246, 255, 0.84);
}

.strong-card {
    background: linear-gradient(180deg, rgba(234, 244, 246, 0.92), rgba(255, 250, 243, 0.88));
}

.warm-card {
    background: linear-gradient(180deg, rgba(255, 242, 223, 0.94), rgba(255, 250, 243, 0.88));
}

.featured-card h3,
.simulation-card h3,
.route-card h3,
.next-card h3,
.hero-note h2 {
    margin: 0;
    font-size: 1.34rem;
}

.featured-card p,
.simulation-card p,
.route-card p,
.next-card p,
.hero-note p {
    margin: 12px 0 0;
    line-height: 1.75;
}

.featured-card .button,
.simulation-card .button,
.next-card .button {
    margin-top: 18px;
}

.route-card ol {
    margin: 16px 0 0;
    padding-left: 1.25rem;
    display: grid;
    gap: 8px;
    line-height: 1.7;
}

.site-footer {
    margin-top: 72px;
    padding: 28px;
    border-radius: 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.footer-title {
    margin: 0;
    font-size: 1.12rem;
}

.site-footer p {
    margin: 10px 0 0;
    max-width: 700px;
    line-height: 1.7;
}

@media (max-width: 1100px) {
    .featured-grid,
    .catalog-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 860px) {
    .page-shell {
        width: min(100%, calc(100% - 24px));
    }

    .hero,
    .route-grid,
    .next-grid {
        grid-template-columns: 1fr;
    }

    .site-header,
    .site-footer,
    .hero-copy,
    .hero-panel,
    .signal-strip,
    .featured-card,
    .simulation-card,
    .route-card,
    .next-card {
        border-radius: 28px;
    }
}

@media (max-width: 640px) {
    .site-header {
        padding: 14px 16px;
    }

    .hero-copy {
        padding: 28px 20px;
    }

    h1 {
        font-size: clamp(2.2rem, 12vw, 3.2rem);
    }

    .featured-grid,
    .catalog-grid {
        grid-template-columns: 1fr;
    }

    .signal-strip,
    .site-footer {
        padding: 22px 20px;
    }
}