:root {
    /* Color Palette - Sage Green & Warm Neutrals for Modern/Calm look */
    --primary-color: #6b8e23;
    /* Olive Drab / Sage-ish */
    --primary-light: #8fbc8f;
    /* Dark Sea Green */
    --secondary-color: #f8f9f5;
    /* Off White with a hint of green */
    --accent-color: #e9d1a8;
    /* Warm Sand / Straw */
    --text-color: #4a4a4a;
    --text-muted: #7a7a7a;
    --bg-color: #ffffff;
    --border-color: #e2e2e2;

    /* Typography */
    --font-main: 'Noto Sans JP', sans-serif;

    /* Layout */
    --container-width: 1000px;
    --header-height: 70px;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.8;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    height: var(--header-height);
    background: var(--bg-color);
    border-bottom: 2px solid var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

nav ul li a {
    font-weight: 500;
    position: relative;
}

nav ul li a:hover {
    color: var(--primary-light);
}

/* Hero Section */
.hero {
    height: 250px;
    /* 府中市の「けやき並木」をイメージした、より遠景（引き）から見た明け方の高品質画像 */
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.45)),
        url('https://images.unsplash.com/photo-1470252649378-9c29740c9fa8?auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content p {
    font-size: 1.2rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* Sections */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 5px;
    font-weight: 600;
    transition: 0.3s;
}

.btn:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: #fff;
    padding: 40px 0;
    text-align: center;
}

.footer-info {
    margin-bottom: 20px;
}

.copyright {
    font-size: 0.9rem;
    color: #ccc;
}

/* Bylaws Page Specifics */
.bylaws-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    align-items: flex-start;
}

.sidebar {
    position: sticky;
    top: calc(var(--header-height) + 20px);
    background: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.sidebar h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.toc li {
    margin-bottom: 10px;
}

.toc a {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.toc a.active,
.toc a:hover {
    color: var(--primary-color);
    font-weight: 600;
}

.bylaws-content article {
    background: #fff;
}

.bylaws-content h2 {
    margin-top: 40px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.bylaws-content h2:first-child {
    margin-top: 0;
}

.clause {
    margin: 25px 0;
}

.clause h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--primary-light);
}

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

    .sidebar {
        display: none;
        /* In full version, use a drawer */
    }

    nav ul {
        display: none;
    }
}