/* ===== CSS Variables ===== */
:root {
    --primary: #FF6B9D;
    --primary-light: #FFB3CC;
    --primary-dark: #E85A8A;
    --gradient-start: #FF6B9D;
    --gradient-end: #FF8BA7;
    --text-primary: #1A1A2E;
    --text-secondary: #4A4A6A;
    --text-tertiary: #8A8AA0;
    --background: #FFFFFF;
    --background-alt: #FFF5F8;
    --background-gradient: linear-gradient(180deg, #FFFFFF 0%, #FFF5F8 50%, #FFECF2 100%);
    --card-shadow: 0 4px 20px rgba(255, 107, 157, 0.1);
    --card-shadow-hover: 0 8px 30px rgba(255, 107, 157, 0.2);
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background: var(--background);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 24px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

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

.contact-btn {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white !important;
    padding: 10px 20px;
    border-radius: 50px;
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.4);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    background: var(--background-gradient);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 107, 157, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 139, 167, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    text-align: center;
    max-width: 600px;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.15), rgba(255, 139, 167, 0.15));
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 107, 157, 0.2);
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 2;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 20px rgba(255, 107, 157, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 107, 157, 0.4);
}

.btn-large {
    padding: 20px 48px;
    font-size: 18px;
}

/* ===== Features Section ===== */
.features {
    padding: 120px 24px;
    background: var(--background);
}

.section-title {
    text-align: center;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 40px 32px;
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid rgba(255, 107, 157, 0.08);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.feature-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.12), rgba(255, 139, 167, 0.12));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Legal Sections ===== */
.legal-section {
    padding: 100px 24px;
    background: var(--background);
}

.privacy-section {
    background: var(--background-alt);
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 48px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--card-shadow);
}

.legal-date {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.legal-intro {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    line-height: 2;
}

.legal-item {
    margin-bottom: 32px;
}

.legal-item:last-child {
    margin-bottom: 0;
}

.legal-item h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.legal-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 2;
}

.legal-item ul {
    margin-top: 12px;
    margin-left: 20px;
}

.legal-item li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.8;
}

.legal-item li strong {
    color: var(--text-primary);
}

/* ===== Contact Section ===== */
.contact-section {
    padding: 120px 24px;
    background: linear-gradient(180deg, var(--background-alt) 0%, #FFECF2 100%);
    text-align: center;
}

.contact-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 2;
}

/* ===== Footer ===== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 24px 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.copyright {
    text-align: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-description br {
        display: none;
    }

    .legal-content {
        padding: 32px 24px;
    }

    .section-title {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .features {
        padding: 80px 20px;
    }

    .legal-section {
        padding: 60px 20px;
    }

    .contact-section {
        padding: 80px 20px;
    }

    .contact-description br {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

/* ===== Scroll Animation ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card {
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }