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

:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-alt: #f9fafb;
    --border-color: #e5e7eb;
    --header-height: 70px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    height: var(--header-height);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    padding: 0.5rem 0;
}

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

.nav-menu a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}

main {
    min-height: calc(100vh - var(--header-height) - 200px);
}

.hero {
    padding: 4rem 0 3rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.hero-text {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-image,
.section-image,
.content-image,
.info-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    margin-top: 2rem;
}

.section-image {
    margin-top: 3rem;
}

.notice {
    padding: 2rem 0;
    background-color: var(--bg-alt);
}

.template-notice {
    padding: 1rem 1.5rem;
    background-color: #fef3c7;
    border-left: 4px solid #f59e0b;
    border-radius: 4px;
    color: #92400e;
    font-size: 0.95rem;
}

.intro,
.features,
.platform-info,
.content-section {
    padding: 4rem 0;
}

.intro h2,
.features h2,
.platform-info h2,
.content-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.intro p,
.platform-info p,
.content-section p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    max-width: 800px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    padding: 2rem;
    background-color: var(--bg-alt);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.info-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-top: 2rem;
}

.info-text p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

.page-header {
    padding: 3rem 0 2rem;
    text-align: center;
    background-color: var(--bg-alt);
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.page-intro {
    font-size: 1.25rem;
    color: var(--text-light);
}

.content-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-top: 2rem;
}

.content-text {
    order: 1;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0 3rem;
}

.info-item {
    padding: 1.5rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.info-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.info-item p {
    color: var(--text-light);
    font-size: 1rem;
}

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

.feature-item {
    padding: 2rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.feature-item h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    margin-top: 2rem;
}

.contact-details {
    display: grid;
    gap: 2rem;
    margin-top: 1.5rem;
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

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

.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: grid;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 0;
    border-color: var(--primary-color);
}

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

.submit-btn {
    padding: 0.875rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    justify-self: start;
}

.submit-btn:hover {
    background-color: #1d4ed8;
}

.submit-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h2 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.legal-content p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.legal-content ul {
    margin: 1rem 0 1rem 2rem;
    color: var(--text-light);
}

.legal-content li {
    margin-bottom: 0.5rem;
}

footer {
    background-color: var(--text-color);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

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

.footer-nav a {
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.footer-nav a:hover {
    opacity: 0.8;
}

.footer-nav a:focus {
    outline: 2px solid white;
    outline-offset: 4px;
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-text {
        font-size: 1.1rem;
    }

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

    .info-content,
    .content-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .content-image {
        order: 2;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

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

@media (max-width: 480px) {
    .nav-menu {
        gap: 0.75rem;
        font-size: 0.9rem;
    }

    .logo {
        font-size: 1.25rem;
    }

    .hero h1,
    .page-header h1 {
        font-size: 1.75rem;
    }

    .hero-text,
    .page-intro {
        font-size: 1rem;
    }

    .intro h2,
    .features h2,
    .platform-info h2,
    .content-section h2 {
        font-size: 1.5rem;
    }

    .footer-nav {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 0 15px;
    }

    .hero,
    .intro,
    .features,
    .platform-info,
    .content-section {
        padding: 2rem 0;
    }
}