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

:root {
    --bg: #f4f7f6;
    --surface: #ffffff;
    --primary: #1f6f4a;
    --primary-dark: #155236;
    --text: #1e1e1e;
    --text-light: #5f6b66;
    --border: #d9e4df;
    --accent: #e8f3ee;
    --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    --radius: 14px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.layout {
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100vh;
    background: var(--primary);
    color: white;
    padding: 70px 20px 28px;
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar h1 {
    font-size: 1.4rem;
    line-height: 1.3;
    margin-bottom: 8px;
}

.sidebar p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 24px;
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav li {
    margin-bottom: 10px;
}

.sidebar nav a {
    display: block;
    text-decoration: none;
    color: white;
    padding: 10px 12px;
    border-radius: 10px;
    transition: background 0.2s ease;
    font-weight: bold;
}

.sidebar nav a:hover {
    background: rgba(255, 255, 255, 0.15);
}

.content {
    padding: 32px;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 28px;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.hero p {
    max-width: 780px;
}

.tag {
    display: inline-block;
    margin-top: 16px;
    background: rgba(255, 255, 255, 0.18);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.9rem;
}

section {
    margin-bottom: 28px;
    background: var(--surface);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: var(--shadow);
}

section h3 {
    color: var(--primary);
    margin-bottom: 14px;
    font-size: 1.35rem;
}

section p {
    margin-bottom: 12px;
    color: var(--text-light);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.card {
    background: var(--accent);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
}

.card h4 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1rem;
}

.timeline {
    border-left: 4px solid var(--primary);
    padding-left: 18px;
    margin-top: 10px;
}

.timeline-item {
    margin-bottom: 18px;
}

.timeline-item strong {
    color: var(--primary);
}

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 8px;
    color: var(--text-light);
}

.sources a {
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
}

.sources a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 16px;
    color: var(--text-light);
    font-size: 0.95rem;
}

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 998;
}

.overlay.show {
    opacity: 1;
    visibility: visible;
}

#menuToggle {
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1000;
    padding: 10px 12px;
    border: none;
    border-radius: 8px;
    background: #1f6f4a;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    box-shadow: var(--shadow);
}

#scrollTopBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 10px 12px;
    border: none;
    border-radius: 50%;
    background: #1f6f4a;
    color: white;
    cursor: pointer;
    display: none;
    z-index: 1000;
    box-shadow: var(--shadow);
}

@media (max-width: 900px) {
    .content {
    padding: 20px;
    }

    .hero {
    padding: 24px 20px;
    }

    .hero h2 {
    font-size: 1.6rem;
    }

    .grid-2 {
    grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    body {
    font-size: 15px;
    }

    .sidebar {
    padding: 14px 12px;
    }

    .sidebar nav ul {
    flex-direction: column;
    }

    .sidebar nav a {
    width: 100%;
    font-size: 0.92rem;
    }

    .content {
    padding: 14px;
    }

    .hero {
    padding: 18px 16px;
    margin-bottom: 18px;
    }

    .hero h2 {
    font-size: 1.35rem;
    line-height: 1.35;
    }

    .hero p {
    font-size: 0.95rem;
    }

    section {
    padding: 18px 16px;
    margin-bottom: 18px;
    }

    section h3 {
    font-size: 1.15rem;
    }

    .card {
    padding: 14px;
    }

    .timeline {
    padding-left: 12px;
    }

    footer {
    padding: 12px;
    font-size: 0.88rem;
    }
}