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

:root {
    --primary-color: #F24E1E;
    --secondary-color: #FF7262;
    --accent-purple: #A259FF;
    --accent-blue: #1ABCFE;
    --accent-green: #0ACF83;
    --text-dark: #1E1E1E;
    --text-light: #666666;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    --border-color: #E5E5E5;
}

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

/* Header & Navigation */
header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

.logo img {
    width: 32px;
    height: 32px;
}

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

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

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

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #F24E1E10 0%, #A259FF10 100%);
    border-radius: 16px;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1.25rem;
    border-radius: 25px;
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Article Section */
.article-section {
    margin-bottom: 4rem;
}

.article-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.article-section h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.article-section p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.article-section ul,
.article-section ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.article-section li {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

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

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    margin-top: 0;
}

.feature-card p {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 0;
}

/* Info Box */
.info-box {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    margin-bottom: 2rem;
}

.info-box h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.info-box p {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0;
}

/* Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    background-color: var(--white);
}

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

.comparison-table th {
    background-color: var(--bg-light);
    font-weight: 600;
    color: var(--text-dark);
}

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

/* Tips List */
.tips-list {
    counter-reset: tip-counter;
}

.tip-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 4rem;
}

.tip-item::before {
    counter-increment: tip-counter;
    content: counter(tip-counter);
    position: absolute;
    left: 1.5rem;
    top: 1.5rem;
    background-color: var(--primary-color);
    color: var(--white);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.tip-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.tip-item p {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0;
}

.keyboard-shortcut {
    display: inline-block;
    background-color: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    margin: 0 0.25rem;
}

/* Resource Links */
.resource-list {
    list-style: none;
    margin-left: 0;
}

.resource-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    margin-bottom: 1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.resource-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.resource-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.resource-item p {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.resource-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.resource-link:hover {
    color: var(--secondary-color);
}

/* Footer */
footer {
    background-color: var(--bg-light);
    padding: 3rem 2rem;
    margin-top: 4rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    nav ul {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .article-section h2 {
        font-size: 2rem;
    }

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

    main {
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

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

    .hero {
        padding: 2rem 1rem;
    }
}