:root {
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-400: #9CA3AF;
    --gray-600: #6B7280;
    --gray-900: #111827;
    --blue-600: #2563EB;
    --blue-700: #1D4ED8;
    --green-600: #059669;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--gray-900);
    background-color: var(--white);
    line-height: 1.6;
}

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

header {
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 0;
    background-color: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-900);
    text-decoration: none;
}

nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

nav a {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--gray-900);
}

.btn-primary {
    background-color: var(--blue-600);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: var(--blue-700);
}

.btn-outline {
    background-color: transparent;
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-outline:hover {
    border-color: var(--gray-900);
    color: var(--gray-900);
}

.btn-block {
    width: 100%;
}

.btn-large {
    padding: 14px 28px;
    font-size: 16px;
}

.mobile-menu {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-600);
}

.hero {
    padding: 80px 0;
    text-align: center;
}

h1 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.subtitle {
    font-size: 20px;
    color: var(--gray-600);
    margin-bottom: 48px;
}

.upload-area {
    max-width: 600px;
    margin: 0 auto 32px;
    padding: 64px 32px;
    border: 2px dashed var(--gray-200);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.upload-area:hover {
    border-color: var(--blue-600);
}

.upload-icon {
    color: var(--gray-400);
    margin-bottom: 16px;
}

.upload-area p {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 8px;
}

.link-button {
    background: none;
    border: none;
    color: var(--blue-600);
    text-decoration: underline;
    cursor: pointer;
    font-size: 16px;
}

.hint {
    font-size: 14px;
    color: var(--gray-400);
}

.trust-row {
    display: flex;
    justify-content: center;
    gap: 32px;
    font-size: 14px;
    color: var(--gray-600);
}

.features {
    padding: 80px 0;
    background-color: var(--gray-50);
}

.features h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 48px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.feature {
    text-align: center;
    padding: 32px;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: block;
}

.feature h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature p {
    color: var(--gray-600);
    font-size: 15px;
}

footer {
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 48px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.footer-section h5 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
    color: var(--gray-600);
}

.footer-section p {
    color: var(--gray-600);
    font-size: 14px;
}

.footer-section a {
    display: block;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 8px;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: var(--gray-900);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.footer-bottom p {
    color: var(--gray-400);
    font-size: 14px;
}

.page-hero {
    padding: 64px 0 32px;
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
}

.content-section {
    padding: 64px 0;
}

.content-block {
    max-width: 800px;
    margin: 0 auto 64px;
}

.content-block h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 24px;
}

.content-block h3 {
    font-size: 24px;
    font-weight: 600;
    margin: 32px 0 16px;
}

.content-block p {
    color: var(--gray-600);
    font-size: 16px;
    margin-bottom: 16px;
}

.content-block ul {
    margin-left: 24px;
    margin-bottom: 16px;
}

.content-block li {
    color: var(--gray-600);
    margin-bottom: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin: 48px 0;
}

.stat-card {
    text-align: center;
    padding: 32px;
    background-color: var(--gray-50);
    border-radius: 8px;
}

.stat-card h3 {
    font-size: 48px;
    font-weight: 600;
    color: var(--blue-600);
    margin-bottom: 8px;
}

.stat-card p {
    color: var(--gray-600);
    font-size: 16px;
}

.comparison-table {
    overflow-x: auto;
    margin: 32px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

th {
    font-weight: 600;
    background-color: var(--gray-50);
}

td {
    color: var(--gray-600);
}

.text-success {
    color: var(--green-600);
    font-weight: 500;
}

.text-muted {
    color: var(--gray-400);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin: 32px 0;
}

.step {
    text-align: center;
    padding: 32px;
}

.step-number {
    display: inline-block;
    width: 48px;
    height: 48px;
    line-height: 48px;
    border-radius: 50%;
    background-color: var(--blue-600);
    color: var(--white);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

.step h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.step p {
    color: var(--gray-600);
    font-size: 15px;
}

.principles-list {
    list-style: none;
    margin-left: 0;
}

.principles-list li {
    padding: 16px;
    margin-bottom: 12px;
    background-color: var(--gray-50);
    border-left: 3px solid var(--blue-600);
    border-radius: 4px;
}

.download-section {
    padding: 64px 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.download-card {
    max-width: 500px;
    margin: 0 auto;
    padding: 48px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    text-align: center;
}

.file-icon {
    color: var(--gray-400);
    margin-bottom: 24px;
}

.download-card h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    word-break: break-all;
}

.file-size {
    color: var(--gray-600);
    font-size: 16px;
    margin-bottom: 24px;
}

.badge-verified {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--green-600);
    color: var(--white);
    font-size: 14px;
    border-radius: 4px;
    margin-bottom: 24px;
}

.file-info {
    margin: 24px 0;
}

details {
    border: 1px solid var(--gray-200);
    border-radius: 4px;
    padding: 16px;
    margin-bottom: 12px;
}

summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-900);
}

.details-content {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-200);
}

.details-content p, .details-content ul {
    color: var(--gray-600);
    font-size: 15px;
}

.details-content ul {
    margin-left: 20px;
}

.details-content li {
    margin-bottom: 8px;
}

.download-footer {
    font-size: 14px;
    color: var(--gray-400);
    margin-top: 24px;
}

.security-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.security-feature {
    padding: 32px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
}

.security-icon {
    font-size: 48px;
    display: block;
    margin-bottom: 16px;
}

.security-feature h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.security-feature p {
    color: var(--gray-600);
    font-size: 15px;
}

.info-box {
    padding: 24px;
    background-color: var(--gray-50);
    border-left: 3px solid var(--blue-600);
    border-radius: 4px;
    margin: 24px 0;
}

.info-box h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.info-box p {
    color: var(--gray-600);
    font-size: 15px;
}

.simple-list {
    list-style: none;
    margin-left: 0;
}

.simple-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
}

.simple-list li:last-child {
    border-bottom: none;
}

.faq-section {
    max-width: 800px;
    margin: 0 auto;
}

.faq-category {
    margin-bottom: 48px;
}

.faq-category h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 24px;
}

.pricing-section {
    padding: 64px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.pricing-card {
    padding: 40px 32px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    position: relative;
}

.pricing-card.popular {
    border-color: var(--blue-600);
    border-width: 2px;
}

.badge-popular {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--blue-600);
    color: var(--white);
    padding: 4px 16px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.pricing-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.price {
    margin-bottom: 16px;
}

.price-amount {
    font-size: 48px;
    font-weight: 600;
    color: var(--gray-900);
}

.price-period {
    font-size: 18px;
    color: var(--gray-600);
}

.plan-description {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 24px;
}

.features-list {
    list-style: none;
    margin: 0 0 32px 0;
}

.features-list li {
    padding: 12px 0;
    color: var(--gray-600);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-200);
}

.features-list li:last-child {
    border-bottom: none;
}

.pricing-note {
    text-align: center;
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 48px;
}

.contact-section {
    padding: 64px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px;
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--blue-600);
}

.contact-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 32px;
}

.contact-method {
    margin-bottom: 32px;
}

.contact-method h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.contact-method p {
    color: var(--gray-600);
    font-size: 15px;
}

.contact-method a {
    color: var(--blue-600);
    text-decoration: none;
}

.contact-note {
    display: block;
    font-size: 14px;
    color: var(--gray-400);
    margin-top: 4px;
}

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

.legal-content h2 {
    font-size: 28px;
    font-weight: 600;
    margin: 48px 0 16px;
}

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

.legal-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 24px 0 12px;
}

.legal-content p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

.legal-content ul {
    margin: 16px 0 16px 24px;
}

.legal-content li {
    color: var(--gray-600);
    margin-bottom: 8px;
}

.legal-content a {
    color: var(--blue-600);
    text-decoration: none;
}

.privacy-highlight {
    padding: 32px;
    background-color: var(--gray-50);
    border-left: 4px solid var(--blue-600);
    border-radius: 4px;
    margin-bottom: 48px;
}

.privacy-highlight h2 {
    margin-top: 0;
}

.privacy-summary {
    padding: 32px;
    background-color: var(--blue-600);
    color: var(--white);
    border-radius: 8px;
    margin-top: 48px;
}

.privacy-summary h3 {
    color: var(--white);
    margin-top: 0;
}

.privacy-summary p {
    color: var(--white);
}

.signin-section {
    padding: 64px 0;
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
}

.signin-card {
    max-width: 480px;
    margin: 0 auto;
    padding: 48px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
}

.signin-card h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
    text-align: center;
}

.signin-subtitle {
    text-align: center;
    color: var(--gray-600);
    font-size: 16px;
    margin-bottom: 32px;
}

.signin-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 32px;
}

.signin-divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: 32px 0;
}

.signin-info {
    padding: 24px;
    background-color: var(--gray-50);
    border-radius: 8px;
    margin-bottom: 24px;
}

.signin-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.signin-info p {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 12px;
    line-height: 1.6;
}

.signin-info a {
    color: var(--blue-600);
    text-decoration: none;
    font-weight: 500;
}

.info-note {
    font-size: 14px;
    color: var(--gray-400);
    margin-top: 8px;
    margin-bottom: 0;
}

.signin-footer {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.signin-footer p {
    color: var(--gray-600);
    font-size: 14px;
}

.signin-footer a {
    color: var(--blue-600);
    text-decoration: none;
}

@media (max-width: 768px) {
    nav {
        display: none;
    }
    
    .mobile-menu {
        display: block;
    }
    
    h1 {
        font-size: 32px;
    }
    
    .subtitle {
        font-size: 18px;
    }
    
    .upload-area {
        padding: 48px 24px;
    }
    
    .trust-row {
        flex-direction: column;
        gap: 16px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .security-features {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .signin-card {
        padding: 32px 24px;
    }
}