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

:root {
    --primary-color: #10a37f;
    --secondary-color: #1a7f64;
    --text-color: #2d333a;
    --light-text: #6b7280;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --code-bg: #f3f4f6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
    padding: 0.5rem 0;
}

nav a:hover,
nav a.active {
    opacity: 0.8;
    text-decoration: underline;
}

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

.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(to bottom, var(--bg-secondary), var(--bg-color));
    border-radius: 12px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    line-height: 1.2;
}

.hero .subtitle {
    font-size: 1.3rem;
    color: var(--light-text);
    margin-bottom: 2rem;
}

.hero .date {
    color: var(--light-text);
    font-size: 0.95rem;
}

/* Typography */
h1, h2, h3, h4 {
    margin-bottom: 1rem;
    line-height: 1.3;
    color: var(--text-color);
}

h2 {
    font-size: 2.2rem;
    margin-top: 3rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
}

h3 {
    font-size: 1.6rem;
    margin-top: 2rem;
    color: var(--primary-color);
}

h4 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

/* Content Sections */
.content-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.feature-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Lists */
ul, ol {
    margin: 1.5rem 0 1.5rem 2rem;
}

li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

ul li {
    list-style-type: disc;
}

/* Code Blocks */
code {
    background: var(--code-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: "Courier New", monospace;
    font-size: 0.9em;
    color: var(--secondary-color);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    overflow: hidden;
}

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

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

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

tr:hover {
    background: var(--bg-secondary);
}

/* Info Boxes */
.info-box {
    background: #e0f2fe;
    border-left: 4px solid #0284c7;
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 6px;
}

.warning-box {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 6px;
}

.success-box {
    background: #d1fae5;
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 6px;
}

/* Footer */
footer {
    background: var(--text-color);
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

footer p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
        justify-content: center;
    }

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

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

    h2 {
        font-size: 1.8rem;
    }

    main {
        padding: 2rem 1rem;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }

    nav ul {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}