:root {
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-soft: #f5f5f5;
    --ink: #000000;
    --sub: #666666;
    --line: #d3d3d3;
    --shadow: rgba(0, 0, 0, 0.2);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: "M PLUS 1", sans-serif;
}

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

main {
    display: block;
}

.site-shell {
    min-height: 100vh;
}

.site-header {
    padding: 14px 0 0;
}

.site-header__inner,
.page-container,
.site-footer__inner {
    width: min(1120px, calc(100% - 20px));
    margin: 0 auto;
}

.site-header__top {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.site-header__brand {
    margin: 0;
    font-size: 24px;
    font-weight: 900;
}

.site-header__brand-link {
    display: inline-block;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.site-nav__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-soft);
    font-size: 13px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.site-nav__link:hover {
    background: #ebebeb;
    border-color: #c2c2c2;
}

.page-intro {
    margin-top: 14px;
    padding: 20px 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: linear-gradient(135deg, #5a5a5a, #3d3d3d);
    color: #ffffff;
    box-shadow: 0 2px 8px var(--shadow);
}

.page-intro__eyebrow {
    display: inline-block;
    margin: 0 0 10px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.18);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.page-intro__title {
    margin: 0;
    font-size: 30px;
    line-height: 1.1;
}

.page-intro__lead {
    margin: 10px 0 0;
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.88);
}

.page-main {
    padding: 16px 0 32px;
}

.site-footer {
    padding: 0 0 28px;
}

.site-footer__text {
    margin: 0;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface-soft);
    color: var(--sub);
    font-size: 13px;
    line-height: 1.8;
    text-align: center;
}

.panel-card,
.content-card {
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    box-shadow: 0 2px 8px var(--shadow);
}

@media (min-width: 768px) {
    .site-header {
        padding-top: 24px;
    }

    .site-header__inner,
    .page-container,
    .site-footer__inner {
        width: min(1120px, calc(100% - 32px));
    }

    .site-header__top {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
    }

    .site-header__brand {
        font-size: 28px;
    }

    .site-nav {
        gap: 10px;
    }

    .site-nav__link {
        min-height: 40px;
        padding: 0 14px;
        font-size: 14px;
    }

    .page-intro {
        margin-top: 18px;
        padding: 28px;
        border-radius: 24px;
    }

    .page-intro__eyebrow {
        margin-bottom: 12px;
        padding: 7px 12px;
        font-size: 12px;
    }

    .page-intro__title {
        font-size: 42px;
    }

    .page-intro__lead {
        max-width: 680px;
        font-size: 15px;
    }

    .page-main {
        padding: 22px 0 48px;
    }

    .site-footer {
        padding-bottom: 40px;
    }

    .site-footer__text {
        padding: 18px 22px;
        border-radius: 22px;
        font-size: 14px;
    }
}