* {
    box-sizing: border-box;
}

:root {
    --bg-1: #f5efe3;
    --bg-2: #dce9f2;
    --ink: #112131;
    --muted: #33465d;
    --brand: #0c5f8d;
    --brand-deep: #07344e;
    --accent: #cf673a;
    --paper: rgba(255, 255, 255, 0.86);
    --paper-border: rgba(16, 56, 84, 0.2);
}

body {
    margin: 0;
    font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", sans-serif;
    background:
        radial-gradient(circle at 10% 0%, rgba(211, 93, 55, 0.16), transparent 36%),
        radial-gradient(circle at 95% 12%, rgba(12, 91, 133, 0.15), transparent 40%),
        linear-gradient(140deg, var(--bg-1) 0%, var(--bg-2) 100%);
    color: var(--ink);
    font-size: 18px;
    line-height: 1.85;
    position: relative;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.2;
    background-image: repeating-linear-gradient(135deg,
            rgba(14, 39, 61, 0.04) 0,
            rgba(14, 39, 61, 0.04) 1px,
            transparent 1px,
            transparent 7px);
}

.sky-gradient {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 15% 22%, rgba(207, 103, 58, 0.2), transparent 34%),
        radial-gradient(circle at 88% 8%, rgba(8, 89, 130, 0.24), transparent 40%),
        radial-gradient(circle at 75% 72%, rgba(9, 75, 110, 0.12), transparent 36%);
}

.page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 44px 20px 88px;
    position: relative;
    z-index: 1;
}

.hero {
    text-align: center;
    background: linear-gradient(162deg, rgba(255, 255, 255, 0.95), rgba(244, 250, 255, 0.88));
    border: 1px solid var(--paper-border);
    border-radius: 30px;
    padding: 62px 26px 56px;
    box-shadow:
        0 26px 56px rgba(17, 40, 61, 0.13),
        inset 0 -28px 42px rgba(12, 91, 133, 0.07);
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: "";
    position: absolute;
    width: 390px;
    height: 390px;
    right: -140px;
    top: -130px;
    border-radius: 48%;
    background: radial-gradient(circle at 32% 30%, rgba(12, 91, 133, 0.22), rgba(12, 91, 133, 0));
}

.hero::before {
    content: "";
    position: absolute;
    left: -160px;
    bottom: -180px;
    width: 380px;
    height: 380px;
    border-radius: 40%;
    background: radial-gradient(circle at 70% 40%, rgba(207, 103, 58, 0.2), rgba(207, 103, 58, 0));
}

.eyebrow {
    margin: 0 0 12px;
    color: #315f86;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    font-size: 0.82rem;
}

h1 {
    margin: 0;
    font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif;
    font-size: clamp(2.4rem, 5vw, 4.1rem);
    font-weight: 800;
    letter-spacing: 0.02em;
    line-height: 1.2;
    color: #123452;
}

.lead {
    max-width: 760px;
    margin: 22px auto 32px;
    color: #2f4b69;
    font-size: 1.2rem;
    text-wrap: balance;
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 999px;
    background: linear-gradient(115deg, #0c6a98, #0a567d);
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(10, 86, 125, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(10, 86, 125, 0.42);
}

.hero-points {
    list-style: none;
    padding: 0;
    margin: 28px auto 0;
    max-width: 760px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.hero-points li {
    font-size: 0.95rem;
    font-weight: 600;
    color: #184a6f;
    padding: 10px 12px;
    border-radius: 999px;
    border: 1px solid rgba(20, 72, 105, 0.22);
    background: rgba(248, 253, 255, 0.68);
}

.main-content {
    margin-top: 34px;
    display: grid;
    gap: 30px;
}

.card,
.feature-card {
    background: var(--paper);
    border-radius: 24px;
    padding: 30px;
    box-shadow: 0 14px 34px rgba(19, 45, 69, 0.1);
    border: 1px solid var(--paper-border);
    backdrop-filter: blur(4px);
    position: relative;
}

h2 {
    margin: 0 0 18px;
    font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif;
    font-size: clamp(1.72rem, 2.2vw, 2.35rem);
    letter-spacing: 0.02em;
    color: #113652;
}

.intro h2 {
    font-size: clamp(2rem, 3vw, 2.7rem);
}

h3 {
    margin-top: 0;
    margin-bottom: 12px;
    color: #1f4d73;
    font-size: 1.45rem;
}

.feature-card h3 {
    font-size: clamp(1.7rem, 2.8vw, 2.15rem);
}

.intro p,
.feature-card p {
    margin: 0 0 14px;
    color: #2f3f52;
    font-size: 1.08rem;
}

.intro p {
    font-size: clamp(1.16rem, 2vw, 1.52rem);
    line-height: 1.95;
}

.feature-card > p {
    font-size: clamp(1.08rem, 1.8vw, 1.38rem);
    line-height: 1.95;
}

.feature-images {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 22px;
}

.feature-images img {
    width: 100%;
    max-width: 100%;
    display: block;
    border-radius: 16px;
    border: 1px solid rgba(16, 56, 84, 0.22);
    box-shadow: 0 10px 24px rgba(22, 53, 83, 0.13);
    min-height: 300px;
    object-fit: cover;
    transition: transform 0.6s ease, box-shadow 0.6s ease;
}

.feature-card:hover .feature-images img {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 16px 30px rgba(22, 53, 83, 0.2);
}

.feature-images p {
    font-size: clamp(1.06rem, 1.5vw, 1.3rem);
    line-height: 1.9;
    color: #253c58;
    font-weight: 500;
    margin: -2px 0 8px;
    border-left: 4px solid rgba(211, 93, 55, 0.45);
    padding-left: 12px;
}

.feature-images-duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 16px;
    row-gap: 10px;
    align-items: start;
}

.feature-images-duo img:nth-of-type(1) {
    grid-column: 1;
    grid-row: 1;
}

.feature-images-duo p:nth-of-type(1) {
    grid-column: 1;
    grid-row: 2;
}

.feature-images-duo img:nth-of-type(2) {
    grid-column: 2;
    grid-row: 1;
}

.feature-images-duo p:nth-of-type(2) {
    grid-column: 2;
    grid-row: 2;
}

.features-section {
    text-align: left;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.feature-card:nth-child(odd) {
    border-top: 4px solid rgba(12, 91, 133, 0.42);
}

.feature-card:nth-child(even) {
    border-top: 4px solid rgba(211, 93, 55, 0.48);
}

.rules-section {
    text-align: left;
}

.rules-list {
    display: grid;
    gap: 16px;
    margin-top: 18px;
}

.rule-item {
    background: rgba(245, 250, 255, 0.9);
    border: 1px solid rgba(22, 69, 102, 0.2);
    border-radius: 16px;
    padding: 20px;
}

.rule-item,
.feature-card,
.card {
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.rule-item:hover,
.feature-card:hover,
.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 38px rgba(19, 45, 69, 0.14);
}

.rule-item h3 {
    margin-bottom: 10px;
}

.rule-item p,
.rules-note {
    font-size: 1.12rem;
    line-height: 1.9;
    color: #2c425d;
}

.rules-note {
    margin-top: 20px;
    padding: 18px 20px;
    background: rgba(255, 244, 230, 0.92);
    border-left: 6px solid #cc7842;
    border-radius: 14px;
}

.privacy-section p {
    margin: 0 0 14px;
    font-size: 1.1rem;
    color: var(--muted);
}

.card::before,
.feature-card::before {
    content: "";
    position: absolute;
    width: 56px;
    height: 8px;
    left: 22px;
    top: -4px;
    border-radius: 99px;
    background: linear-gradient(90deg, rgba(12, 91, 133, 0.48), rgba(211, 93, 55, 0.42));
}

.reveal {
    opacity: 0;
    transform: translateY(36px) scale(0.98);
    transition: opacity 0.9s cubic-bezier(0.2, 0.75, 0.2, 1),
        transform 0.9s cubic-bezier(0.2, 0.75, 0.2, 1);
    will-change: opacity, transform;
}

.reveal[data-reveal="hero"] {
    transform: translateY(24px) scale(0.99);
}

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

@media (max-width: 900px) {
    body {
        font-size: 16px;
    }

    .page {
        padding: 28px 16px 56px;
    }

    .hero {
        padding: 40px 18px 34px;
        border-radius: 22px;
    }

    .hero::before,
    .hero::after {
        width: 240px;
        height: 240px;
    }

    .hero::after {
        right: -96px;
        top: -96px;
    }

    .hero::before {
        left: -108px;
        bottom: -126px;
    }

    .hero-points {
        grid-template-columns: 1fr;
        gap: 8px;
        margin-top: 22px;
    }

    .main-content {
        margin-top: 22px;
        gap: 18px;
    }

    .card,
    .feature-card {
        padding: 22px 16px;
        border-radius: 18px;
    }

    h2 {
        font-size: clamp(1.5rem, 5.2vw, 2rem);
        margin-bottom: 14px;
    }

    h3 {
        font-size: clamp(1.2rem, 4.4vw, 1.45rem);
    }

    .intro p,
    .feature-card p,
    .feature-images p,
    .rule-item p,
    .rules-note,
    .privacy-section p {
        font-size: 1rem;
        line-height: 1.75;
    }

    .feature-images {
        gap: 12px;
        margin-top: 14px;
    }

    .feature-images-duo {
        grid-template-columns: 1fr;
        row-gap: 10px;
    }

    .feature-images-duo>* {
        grid-column: auto !important;
        grid-row: auto !important;
    }

    .feature-images img {
        min-height: clamp(180px, 46vw, 300px);
    }

    .rules-list {
        gap: 12px;
        margin-top: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .reveal,
    .feature-images img,
    .rule-item,
    .feature-card,
    .card,
    .cta-button {
        transition: none !important;
        transform: none !important;
    }

    .reveal {
        opacity: 1;
    }
}

@media (max-width: 640px) {
    .page {
        padding: 20px 12px 38px;
    }

    .hero,
    .card,
    .feature-card {
        padding: 18px 14px;
        border-radius: 14px;
    }

    .hero::before,
    .hero::after {
        opacity: 0.55;
    }

    .eyebrow {
        font-size: 0.72rem;
        letter-spacing: 0.1em;
    }

    .hero-points {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .hero-points li {
        font-size: 0.88rem;
        padding: 8px 10px;
    }

    .feature-images {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: clamp(1.8rem, 9vw, 2.2rem);
        line-height: 1.25;
    }

    .lead {
        font-size: 0.96rem;
        margin: 16px auto 20px;
    }

    .feature-images img {
        min-height: 180px;
    }

    .rule-item,
    .rules-note {
        padding: 14px 12px;
    }
}