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

:root {
    --black: #000000;
    --white: #ffffff;
    --gray: #888888;
    --light-gray: #f5f5f5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-weight: 300;
    line-height: 1.6;
    color: var(--black);
    background: var(--white);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Navigation */
nav {
    padding: 24px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-size: 20px;
    font-weight: 400;
    color: var(--black);
    text-decoration: none;
}

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

.nav-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.2s;
}

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

/* Hero Section */
.hero {
    padding: 120px 0;
    text-align: center;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 27px;
    margin: 0 auto 32px;
    display: block;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.hero h1 {
    font-size: 56px;
    font-weight: 300;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 20px;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto 48px;
}

.download-button {
    display: inline-block;
    margin: 0 auto;
}

.download-button img {
    height: 50px;
    width: auto;
    transition: opacity 0.2s;
}

.download-button:hover img {
    opacity: 0.8;
}

/* Features Section */
.features {
    padding: 80px 0;
    background: var(--light-gray);
}

.features .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 64px;
}

.feature {
    text-align: center;
}

.feature-icon {
    color: var(--black);
    margin-bottom: 24px;
}

.feature-icon svg {
    width: 48px;
    height: 48px;
    display: block;
    margin: 0 auto;
}

.feature h3 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 16px;
}

.feature p {
    font-size: 16px;
    color: var(--gray);
    line-height: 1.8;
}

/* CTA Section */
.cta {
    padding: 120px 0;
    text-align: center;
}

.cta h2 {
    font-size: 40px;
    font-weight: 300;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 40px;
}

/* Footer */
footer {
    padding: 48px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

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

footer p {
    font-size: 14px;
    color: var(--gray);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 14px;
    color: var(--gray);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--black);
}

/* Content Pages */
.content-page {
    padding: 80px 0 120px;
    max-width: 800px;
    margin: 0 auto;
}

.content-page h1 {
    font-size: 48px;
    font-weight: 300;
    margin-bottom: 16px;
}

.content-page .date {
    font-size: 14px;
    color: var(--gray);
    margin-bottom: 48px;
    display: block;
}

.content-page h2 {
    font-size: 32px;
    font-weight: 400;
    margin: 48px 0 24px;
}

.content-page h3 {
    font-size: 24px;
    font-weight: 400;
    margin: 32px 0 16px;
}

.content-page p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 24px;
    color: #333;
}

.content-page ul, .content-page ol {
    margin: 24px 0;
    padding-left: 32px;
}

.content-page li {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 12px;
    color: #333;
}

.content-page a {
    color: var(--black);
    text-decoration: underline;
}

.content-page a:hover {
    opacity: 0.7;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 48px auto 0;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    margin-bottom: 8px;
    color: var(--black);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    font-family: inherit;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    background: var(--white);
    transition: border-color 0.2s;
}

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

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.submit-button {
    background: var(--black);
    color: var(--white);
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 400;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.submit-button:hover {
    opacity: 0.8;
}

/* 404 Page */
.error-page {
    padding: 120px 0;
    text-align: center;
    min-height: 60vh;
}

.error-page h1 {
    font-size: 120px;
    font-weight: 300;
    margin-bottom: 24px;
    color: var(--black);
}

.error-page h2 {
    font-size: 32px;
    font-weight: 400;
    margin-bottom: 16px;
}

.error-page p {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 40px;
}

.error-page a {
    color: var(--black);
    text-decoration: underline;
    font-size: 18px;
}

.error-page a:hover {
    opacity: 0.7;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 40px;
    }

    .subtitle {
        font-size: 18px;
    }

    .features .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .cta h2 {
        font-size: 32px;
    }

    footer .container {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .nav-links {
        gap: 20px;
    }

    .content-page h1 {
        font-size: 36px;
    }

    .error-page h1 {
        font-size: 80px;
    }
}