:root {
    --primary-color: #0056b3;
    --secondary-color: #00aaff;
    --accent-color: #ff9800;
    --text-color: #333;
    --light-gray: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 5%;
}

.bg-light {
    background-color: var(--light-gray);
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero */
.hero {
    height: 80vh;
    min-height: 550px;
    background: #00285a url('../images/hero.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    position: relative;
    color: var(--white);
    text-align: left;
}

.hero-subline {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--accent-color);
    letter-spacing: 2px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0,40,90,0.5) 0%, rgba(0,40,90,0.1) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 15px rgba(0,0,0,0.4);
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin-bottom: 2.5rem;
    max-width: 600px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255,152,0,0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255,152,0,0.4);
    background: #e68a00;
}

/* Sections */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title span {
    color: var(--primary-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 10px;
}

.section-title h2 {
    font-size: 2.2rem;
    position: relative;
    padding-bottom: 15px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
}

/* About */
.about-flex {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 1.5rem;
}

.about-signature {
    font-weight: 700;
    text-align: right;
    color: var(--text-color);
    margin-top: 20px;
}

.about-image {
    flex: 1;
}

.about-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

/* Services */
.service-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

.service-item {
    background: var(--white);
    padding: 50px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    position: relative;
    border: 1px solid rgba(0,0,0,0.03);
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,86,179,0.15);
    border-color: var(--primary-color);
}

.service-icon {
    font-size: 2.5rem;
    margin-bottom: 25px;
    background: var(--light-gray);
    width: 100px;
    height: 100px;
    line-height: 100px;
    border-radius: 50%;
    margin-left: auto;
    margin-right: auto;
    transition: var(--transition);
}

.service-item:hover .service-icon {
    background: var(--primary-color);
    color: var(--white);
    transform: rotateY(360deg);
}

.service-item h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.5rem;
    position: relative;
}

.service-item h3::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--accent-color);
    margin: 10px auto 0;
}

.service-item p {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.7;
}

/* Partners */
.partner-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.partner-group {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid #eee;
}

.partner-group h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.partner-group ul {
    list-style: none;
}

.partner-group ul li {
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
    font-size: 0.95rem;
}

/* Contact (Offices) */
.contact-container {
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.office {
    background: var(--white);
    padding: 35px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    border: 1px solid #eee;
}

.office h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.4rem;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

.office .label {
    font-weight: 700;
    color: #888;
    width: 6rem;
    display: inline-block;
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: #222;
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

footer p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition);
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        margin: 20px 0;
    }

    .about-flex {
        flex-direction: column;
    }

    .sp-only {
        display: block;
    }

    .hero {
        text-align: center;
    }

    .hero-overlay {
        background: rgba(0,86,179,0.7);
    }
}

.sp-only {
    display: none;
}