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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===========================
   Header
   =========================== */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.logo .tagline {
    font-size: 0.75rem;
    color: var(--text-light);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* ===========================
   Hero Section
   =========================== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-title .highlight {
    color: var(--accent-color);
}

.hero-subtitle {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 4rem;
    backdrop-filter: blur(10px);
}

.hero-visual i {
    font-size: 10rem;
    opacity: 0.8;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ===========================
   Section Headers
   =========================== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
}

/* ===========================
   Features Section
   =========================== */
.features {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ===========================
   Platforms Section
   =========================== */
.platforms {
    padding: 5rem 0;
    background-color: white;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.platform-item {
    text-align: center;
    padding: 2rem;
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.platform-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    width: 5rem;
    height: 5rem;
    background-color: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.platform-icon i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.platform-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
}

/* ===========================
   Benefits Section
   =========================== */
.benefits {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.benefits .section-header h2,
.benefits .section-header p {
    color: white;
}

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

.benefit-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.benefit-number {
    font-size: 3rem;
    font-weight: 700;
    opacity: 0.3;
    margin-bottom: 1rem;
}

.benefit-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.benefit-item p {
    line-height: 1.7;
    opacity: 0.9;
}

/* ===========================
   Pricing Section
   =========================== */
.pricing {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

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

.pricing-card {
    background-color: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border: 3px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-badge {
    background-color: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    position: absolute;
    top: 1rem;
    right: 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    padding: 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.price {
    margin: 1.5rem 0;
}

.price .currency {
    font-size: 1.5rem;
    vertical-align: super;
}

.price .amount {
    font-size: 3rem;
    font-weight: 700;
}

.billing {
    font-size: 0.875rem;
    opacity: 0.9;
}

.pricing-features {
    list-style: none;
    padding: 2rem;
}

.pricing-features li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.pricing-features i {
    color: var(--success-color);
    font-size: 1.125rem;
}

.pricing-card .btn {
    margin: 0 2rem 2rem;
    width: calc(100% - 4rem);
}

/* ===========================
   Contact Section
   =========================== */
.contact {
    padding: 5rem 0;
    background-color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.contact-item strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.contact-item p {
    color: var(--text-light);
    margin: 0;
}

.contact-form-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ===========================
   Modal
   =========================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    border-radius: 1rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
}

.close {
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--text-dark);
}

/* ===========================
   Contact Form
   =========================== */
.contact-form {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    opacity: 0.7;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        display: none;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .features,
    .platforms,
    .benefits,
    .pricing,
    .contact {
        padding: 3rem 0;
    }

    .features-grid,
    .platforms-grid,
    .benefits-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .modal-content {
        width: 95%;
    }

    .contact-form {
        padding: 1rem;
    }
}