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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans SC", sans-serif;
    color: #333;
    background-color: #F7F4EF;
    line-height: 1.7;
}

h1, h2, h3, h4 {
    font-family: "Noto Serif SC", serif;
    font-weight: 600;
}

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

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
}

.max-4xl {
    max-width: 900px;
}

:root {
    --tea: #6B5747;
    --tealight: #A8927E;
    --rice: #F7F4EF;
    --ink: #333;
    --cyan: #94B4B8;
    --white: #fff;
}

header {
    position: sticky;
    top: 0;
    z-index: 99;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(6px);
    box-shadow: 0 1px 6px rgba(107,87,71,0.08);
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.brand-logo {
    font-size: 1.7rem;
    font-family: "Noto Serif SC", serif;
    font-weight: 700;
    color: var(--tea);
}

.nav-pc {
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
}

    .nav-pc a {
        transition: color 0.3s;
        padding-bottom: 2px;
    }

        .nav-pc a:hover {
            color: var(--tea);
        }

        .nav-pc a.active {
            color: var(--tea);
            border-bottom: 2px solid var(--tea);
        }

.menu-btn {
    display: none;
    font-size: 1.4rem;
    color: var(--tea);
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-mobile {
    display: none;
    border-top: 1px solid #eee;
    background: #fff;
    padding: 0.8rem 0;
}

    .nav-mobile a {
        display: block;
        padding: 0.4rem 0;
        font-size: 0.9rem;
    }

        .nav-mobile a:hover {
            color: var(--tea);
        }

.banner {
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(247,244,239,0.92), rgba(247,244,239,0.94)), url('https://picsum.photos/id/1036/1920/1080');
    background-size: cover;
    background-position: center;
    padding: 5rem 0;
}

    .banner h1 {
        font-size: clamp(2.8rem,7vw,4.5rem);
        color: var(--tea);
        line-height: 1.1;
    }

.banner-sub1 {
    font-size: clamp(1.1rem,2vw,1.4rem);
    color: rgba(107,87,71,0.8);
    margin-top: 0.8rem;
}

.banner-sub2 {
    color: var(--tealight);
    font-size: 1.1rem;
    margin-top: 0.3rem;
}

.btn-group {
    margin-top: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.btn-solid {
    padding: 0.75rem 1.6rem;
    background: var(--tea);
    color: #fff;
    border-radius: 4px;
    transition: background 0.3s;
}

    .btn-solid:hover {
        background: var(--tealight);
    }

.btn-outline {
    padding: 0.75rem 1.6rem;
    border: 1px solid var(--tea);
    color: var(--tea);
    border-radius: 4px;
    transition: all 0.3s;
}

    .btn-outline:hover {
        background: var(--tea);
        color: #fff;
    }

.banner-desc {
    margin-top: 2.5rem;
    color: rgba(51,51,51,0.7);
    max-width: 600px;
}

section {
    padding: 5rem 0;
}

.bg-white {
    background: var(--white);
}

.bg-rice {
    background: var(--rice);
}

.section-title {
    text-align: center;
    font-size: clamp(1.8rem,4vw,2.4rem);
    color: var(--tea);
    margin-bottom: 3rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 2rem;
}

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

.card {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(107,87,71,0.08);
    border: 1px solid var(--rice);
}

    .card h3 {
        font-size: 1.6rem;
        color: var(--tea);
        margin-bottom: 1rem;
    }

.icon-card {
    text-align: center;
    padding: 1.5rem 1rem;
}

    .icon-card h4 {
        margin-bottom: 0.5rem;
    }

    .icon-card p {
        font-size: 0.9rem;
        color: rgba(51,51,51,0.7);
    }

footer {
    background: var(--ink);
    color: #fff;
    padding: 2.5rem 0;
}

.copyright-wrap {
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.6;
}

@media(max-width:768px) {
    .nav-pc {
        display: none;
    }

    .menu-btn {
        display: block;
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }

    .banner {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }
}