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

:root {
    --primary-color: #fcda47;
    --primary-dark: #f5c623;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --border-light: #e0e0e0;
    --bg-light: #f9f9f9;
    --bg-white: #ffffff;
    --success: #4caf50;
    --danger: #f44336;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 2px 2px 4px rgba(252, 218, 71, 0.1);
}

.nav {
    display: flex;
    gap: 30px;
}

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

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

.nav-link.cta-link {
    background-color: var(--primary-color);
    color: var(--text-dark);
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
}

.nav-link.cta-link:hover {
    background-color: var(--primary-dark);
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #ffffff 0%, #f9f9f9 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.hero-description {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.info-card {
    background-color: var(--bg-white);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.info-card .label {
    display: block;
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.info-card .value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(252, 218, 71, 0.3);
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

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

.features h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 15px;
    display: block;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* Download Section */
.download-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.download-box {
    background-color: var(--bg-white);
    padding: 60px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.download-box h2 {
    font-size: 36px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.download-subtitle {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.security-note {
    margin-top: 20px;
    color: var(--text-light);
    font-size: 14px;
}

/* Installation Section */
.installation {
    padding: 80px 0;
}

.installation h2 {
    font-size: 36px;
    margin-bottom: 50px;
    text-align: center;
    color: var(--text-dark);
}

.installation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.install-method {
    background-color: var(--bg-light);
    padding: 30px;
    border-radius: 8px;
    border-top: 4px solid var(--primary-color);
}

.install-method h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.install-method ol {
    margin-left: 20px;
    color: var(--text-light);
    line-height: 1.8;
}

.install-method li {
    margin-bottom: 10px;
}

.troubleshooting {
    background-color: var(--bg-light);
    padding: 40px;
    border-radius: 8px;
    margin-top: 40px;
}

.troubleshooting h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.trouble-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
}

.trouble-table tr {
    border-bottom: 1px solid var(--border-light);
}

.trouble-table tr:last-child {
    border-bottom: none;
}

.trouble-table td {
    padding: 15px;
    text-align: left;
}

.trouble-table tr:first-child {
    background-color: var(--primary-color);
    font-weight: 600;
}

.trouble-table tr:first-child td {
    color: var(--text-dark);
}

/* Content Guide Section */
.content-guide {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.content-guide h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.content-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.category-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.category-card h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.category-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* Specs Section */
.specs {
    padding: 80px 0;
}

.specs h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    overflow: hidden;
}

.specs-table tr {
    border-bottom: 1px solid var(--border-light);
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table tr:nth-child(even) {
    background-color: var(--bg-light);
}

.specs-table td {
    padding: 18px;
    text-align: left;
}

.specs-table td:first-child {
    font-weight: 600;
    width: 35%;
}

/* Safety Section */
.safety {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.safety h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.safety-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 50px;
}

.safety-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.safety-card h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.safety-card ul {
    list-style: none;
    margin-left: 0;
}

.safety-card li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 25px;
}

.safety-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.permission-check {
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.permission-check h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.permission-check p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.permission-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.permission {
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
}

.permission.safe {
    background-color: rgba(76, 175, 80, 0.1);
    color: #2e7d32;
}

.permission.danger {
    background-color: rgba(244, 67, 54, 0.1);
    color: #c62828;
}

/* FAQ Section */
.faq {
    padding: 80px 0;
}

.faq h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.faq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.faq-item {
    background-color: var(--bg-light);
    padding: 30px;
    border-radius: 8px;
    border-top: 3px solid var(--primary-color);
}

.faq-item h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.faq-item p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: var(--bg-white);
    padding: 60px 0 20px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.footer-section p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

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

    .nav {
        gap: 15px;
    }

    .logo h1 {
        font-size: 24px;
    }

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

    .download-box {
        padding: 40px 20px;
    }

    .features-grid,
    .content-categories,
    .faq-grid {
        grid-template-columns: 1fr;
    }

    .features h2,
    .installation h2,
    .content-guide h2,
    .specs h2,
    .safety h2,
    .faq h2 {
        font-size: 28px;
    }

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

    .permission-list {
        flex-direction: column;
    }

    .permission {
        width: 100%;
    }

    .hero,
    .features,
    .installation,
    .content-guide,
    .specs,
    .safety,
    .faq {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }

    .nav {
        width: 100%;
        flex-direction: column;
        gap: 10px;
    }

    .nav-link {
        text-align: center;
        padding: 10px;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

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

    .info-card {
        padding: 15px;
    }

    .info-card .value {
        font-size: 20px;
    }

    .trouble-table td,
    .specs-table td {
        padding: 10px;
        font-size: 12px;
    }

    .specs-table td:first-child {
        width: 40%;
    }

    .permission-list {
        flex-direction: column;
    }
}