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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Header & Navigation */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.8rem;
    font-weight: bold;
    color: #5A73FF;
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #5A73FF;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: all 0.3s;
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #5A73FF 0%, #4158D0 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* About Intro */
.about-intro {
    padding: 80px 0;
    background: white;
}

.intro-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.intro-content h2 {
    font-size: 2.5rem;
    color: #5A73FF;
    margin-bottom: 2rem;
}

.intro-content p {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.intro-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-screenshot {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(90, 115, 255, 0.3);
}

/* Mission Vision */
.mission-vision {
    padding: 80px 0;
    background: #f8f9fa;
}

.mv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.mv-card {
    background: white;
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.mv-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.mv-card h3 {
    font-size: 2rem;
    color: #5A73FF;
    margin-bottom: 1.5rem;
}

.mv-card p {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
}

/* Security & Privacy */
.security-privacy {
    padding: 80px 0;
    background: white;
}

.security-privacy h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #5A73FF;
    margin-bottom: 3rem;
}

.security-text {
    max-width: 900px;
    margin: 0 auto;
}

.security-text p {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.security-features {
    margin-top: 3rem;
    display: grid;
    gap: 2rem;
}

.security-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #5A73FF;
}

.security-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.security-item h4 {
    font-size: 1.2rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.security-item p {
    font-size: 1rem;
    color: #666;
    margin: 0;
}

/* Important Notice */
.important-notice {
    padding: 80px 0;
    background: #f8f9fa;
}

.notice-card {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 15px;
    border: 2px solid #5A73FF;
    box-shadow: 0 5px 20px rgba(90, 115, 255, 0.1);
}

.notice-card h2 {
    font-size: 2rem;
    color: #5A73FF;
    margin-bottom: 1.5rem;
}

.notice-card p {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* Values */
.values {
    padding: 80px 0;
    background: white;
}

.values h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #5A73FF;
    margin-bottom: 3rem;
}

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

.value-item {
    text-align: center;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(90, 115, 255, 0.2);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.value-item h3 {
    font-size: 1.3rem;
    color: #5A73FF;
    margin-bottom: 1rem;
}

.value-item p {
    font-size: 1rem;
    color: #666;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #5A73FF 0%, #4158D0 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

.btn-primary {
    background: white;
    color: #5A73FF;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: white;
    padding: 50px 0 20px;
}

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

.footer-section h3 {
    color: #5A73FF;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: #5A73FF;
}

.footer-section p {
    color: #ccc;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    color: #888;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: left 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.1);
        padding: 2rem 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .mv-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 60px 0;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .page-header p {
        font-size: 1rem;
    }

    .about-intro,
    .mission-vision,
    .security-privacy,
    .important-notice,
    .values,
    .cta-section {
        padding: 50px 0;
    }

    .intro-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .intro-content h2,
    .security-privacy h2,
    .values h2,
    .cta-section h2 {
        font-size: 1.8rem;
    }

    .intro-content p,
    .security-text p {
        font-size: 1rem;
    }

    .about-screenshot {
        max-width: 90%;
    }

    .mv-card {
        padding: 2rem;
    }

    .mv-card h3 {
        font-size: 1.5rem;
    }

    .security-item {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }

    .notice-card {
        padding: 2rem;
    }

    .notice-card h2 {
        font-size: 1.5rem;
    }

    .notice-card p {
        font-size: 1rem;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }

    .logo-icon {
        width: 35px;
        height: 35px;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .intro-content h2,
    .security-privacy h2,
    .values h2 {
        font-size: 1.5rem;
    }

    .mv-icon {
        font-size: 3rem;
    }

    .btn {
        padding: 10px 25px;
        font-size: 0.9rem;
    }

    .btn-large {
        padding: 12px 30px;
        font-size: 1rem;
    }
}