:root {
    /* Material Design 3 Color Tokens (Deep Sea & Lavender Scheme) */
    --m3-primary: #0061a4;            /* 信頼感のあるメインブルー */
    --m3-on-primary: #ffffff;
    --m3-primary-container: #d1e4ff;  /* 柔らかい水色の背景 */
    
    --m3-secondary: #535f70;
    --m3-secondary-container: #d7e3f7; /* カードのアクセント */
    
    --m3-tertiary: #6b5778;
    --m3-tertiary-container: #f2daff; /* 華やかなラベンダー */
    
    --m3-surface: #fdfbff;            /* 全体の背景（ほぼ白に近い青） */
    --m3-surface-variant: #dfe3eb;    /* ホバー時の色 */
    --m3-on-surface: #1a1c1e;         /* テキスト色 */
    --m3-outline: #73777f;            /* 境界線 */
}

body {
    margin: 0;
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--m3-surface);
    color: var(--m3-on-surface);
}

.kura-logo{
    width: 150px;
    height: auto;
}

.m3-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* App Bar */
.m3-app-bar {
    padding: 24px 5%;
    background-color: var(--m3-surface);
}

.m3-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--m3-primary);
}

/* Hero Section */
.m3-hero {
    padding: 20px;
}

.m3-hero-card {
    background-color: var(--m3-primary-container);
    border-radius: 28px; /* M3の大きな角丸 */
    padding: 60px 40px;
    text-align: center;
}

.kura-logo {
    max-width: 250px;
    margin-bottom: 32px;
}

.m3-hero-card h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 24px;
}

.m3-hero-card p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 40px;
}

/* FAB (Floating Action Button) Style CTA */
.m3-fab {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background-color: var(--m3-primary);
    color: var(--m3-on-primary);
    padding: 18px 32px;
    border-radius: 16px;
    text-decoration: none;
    font-weight: 500;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: 0.3s cubic-bezier(0.2, 0, 0, 1);
}

.m3-fab:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transform: scale(1.02);
}

/* Features Section */
.m3-content {
    padding: 80px 5%;
}

.m3-section-title {
    font-size: 2rem;
    margin-bottom: 40px;
}

.m3-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.m3-card {
    background-color: #fff;
    border-radius: 24px;
    padding: 32px;
    border: 1px solid var(--m3-outline);
    transition: 0.3s;
}

.m3-card:hover {
    background-color: var(--m3-surface-variant);
}

.m3-icon-box {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.m3-icon-box.primary { background-color: var(--m3-primary-container); color: var(--m3-primary); }
.m3-icon-box.secondary { background-color: var(--m3-secondary-container); color: #1d1b20; }
.m3-icon-box.tertiary { background-color: var(--m3-tertiary-container); color: #001d35; }

/* Footer */
.m3-footer {
    padding: 60px 5%;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .m3-hero-card h1 { font-size: 2rem; }
}