/* Navigation */
.header-nav ul {
    display: flex;
    list-style: none;
    gap: 40px;
}

.header-nav a {
    font-family: var(--font-primary), var(--font-japanese);
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    letter-spacing: -0.01em;
    transition: color 0.3s ease;
    position: relative;
}

.header-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

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

.header-nav a:hover::after {
    width: 100%;
}

/* Buttons */
.header-button {
    background: var(--accent-orange);
    color: var(--bg-white);
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-primary), var(--font-japanese);
    font-weight: 700;
    font-size: 15px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(255, 149, 0, 0.3);
}

.button-icon {
    font-size: 18px;
}

.header-button:hover {
    background: #ff8c00;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 149, 0, 0.4);
}

.mobile-menu-button {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* Section Titles */
.section-title {
    font-family: var(--font-display), var(--font-japanese);
    text-align: center;
    font-size: 48px;
    font-weight: 900;
    margin-bottom: 60px;
    color: var(--text-dark);
    letter-spacing: -0.03em;
}

.section-subtitle {
    font-family: var(--font-primary), var(--font-japanese);
    text-align: center;
    font-size: 20px;
    color: var(--text-gray);
    margin-top: -40px;
    margin-bottom: 60px;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.section-subtitle-en {
    font-family: var(--font-primary);
    font-size: 18px;
    letter-spacing: 0.2em;
    opacity: 0.6;
    text-transform: uppercase;
    color: var(--text-gray);
}