/* CSS Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-alt: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-lg: 12px;
}

html {
    scroll-behavior: smooth;
}

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

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

/* Header & Navigation */
.site-header {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

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

.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 14px 32px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Content Sections */
.content-section {
    padding: 80px 20px;
}

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

.content-section h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: var(--text-color);
}

/* Info Cards Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.info-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.info-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

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

/* Comparison Table */
.comparison-section {
    padding: 80px 20px;
    background: var(--bg-alt);
}

.comparison-section h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
}

.comparison-table-wrapper {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-table th,
.comparison-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

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

.comparison-table tr:hover {
    background: var(--bg-alt);
}

.comparison-table td.good {
    color: var(--secondary-color);
    font-weight: 500;
}

.comparison-table td.neutral {
    color: var(--text-light);
}

.comparison-table td.bad {
    color: #ef4444;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.benefit-item {
    background: var(--bg-color);
    padding: 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.benefit-item h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
}

.benefit-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Guide Steps */
.guide-steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 25px;
    margin-bottom: 35px;
    align-items: flex-start;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.step-content p {
    color: var(--text-light);
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.tip-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.tip-card h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

.tip-card ul {
    list-style: none;
}

.tip-card li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-light);
    font-size: 0.95rem;
}

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

/* FAQ Section */
.faq-section {
    padding: 80px 20px;
}

.faq-section h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
}

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

.faq-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-item summary {
    padding: 20px;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.5rem;
    color: var(--primary-color);
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-item p {
    padding: 0 20px 20px;
    color: var(--text-light);
}

/* Footer */
.site-footer {
    background: var(--text-color);
    color: white;
    padding: 60px 20px 30px;
}

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

.footer-brand .logo-icon,
.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    margin-top: 15px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

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

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

    .content-section {
        padding: 50px 20px;
    }

    .content-section h2 {
        font-size: 1.6rem;
        margin-bottom: 35px;
    }

    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 12px 10px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 50px 15px;
    }

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

    .info-card,
    .benefit-item,
    .tip-card {
        padding: 20px;
    }
}