:root {
    --color-navy: #1a3c61;
    --color-orange: #ff7e00;
    --color-lightblue: #9bd3e1;
    --color-white: #ffffff;
    --color-bg: #fdfaf5; /* Warm background */
    --color-text: #333333;
    --font-main: 'Noto Sans JP', sans-serif;
    --shadow-soft: 0 10px 30px rgba(26, 60, 97, 0.1);
    --border-radius: 12px;
}

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

body {
    background-color: var(--color-bg);
    font-family: var(--font-main);
    color: var(--color-navy);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header & Navigation */
header {
    background-color: var(--color-white);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-navy);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

nav a {
    text-decoration: none;
    color: var(--color-navy);
    font-weight: 700;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    white-space: nowrap;
}

nav a:hover,
nav a.active {
    color: var(--color-orange);
}

.cta-button {
    background-color: var(--color-orange);
    color: var(--color-white);
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    font-weight: 700;
    transition: transform 0.3s ease, background-color 0.3s ease;
    white-space: nowrap;
}

.cta-button:hover {
    background-color: #e67200;
    transform: translateY(-2px);
}

/* Common Layout Elements */
section {
    padding: 5rem 10%;
}

h1, h2, h3 {
    margin-bottom: 1.5rem;
}

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

/* Footer */
footer {
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: 4rem 10%;
    margin-top: 5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-size: 2rem;
    font-weight: 900;
    color: var(--color-lightblue);
    margin-bottom: 1rem;
}

.copyright {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Placeholders & Grid */
.placeholder-content {
    background: white;
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    text-align: center;
    border-top: 8px solid var(--color-lightblue);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
    header {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0.8rem 2%;
    }
    .logo {
        font-size: 1.3rem;
        white-space: nowrap;
    }
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }
    section {
        padding: 3rem 5%;
    }
}

@media (max-width: 600px) {
    nav ul {
        gap: 0.4rem;
    }
    nav a {
        font-size: 0.8rem;
    }
    .cta-button {
        padding: 0.4rem 0.6rem;
    }
}