/* === GreenSoul Theme - CSS Reset & Basic Setup === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #2d6a4f; /* Deep Forest Green */
    --secondary-color: #40916c; /* Medium Leaf Green */
    --accent-color: #52b788; /* Vibrant Leaf Green */
    --bg-color: #f8f9fa; /* Light Cream */
    --text-color: #343a40; /* Dark Charcoal */
    --heading-font-color: #1b4332; /* Darker Forest Green */
    --border-color: #dee2e6;
    --card-bg-color: #ffffff;
    --footer-bg-color: #1b4332;
    --footer-text-color: #f8f9fa;

    --font-family: 'Merriweather', 'Noto Serif JP', serif;
    --line-height: 1.7;
    --transition-speed: 0.3s ease;
    --border-radius: 8px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.12);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height);
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

img {
    max-width: 100%;
    display: block;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family);
    color: var(--heading-font-color);
    line-height: 1.3;
    margin-bottom: 1rem;
    font-weight: 700;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1.5rem; }

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover, a:focus {
    color: var(--primary-color);
    text-decoration: underline;
}

/* === Header & Navigation === */
.main-header {
    background-color: var(--card-bg-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

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

.site-title a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    font-weight: 700;
    font-size: 1rem;
    color: var(--secondary-color);
    text-decoration: none;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width var(--transition-speed);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

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

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
}


/* === Hero Section === */
.hero {
    background: linear-gradient(rgba(27, 67, 50, 0.1), rgba(27, 67, 50, 0.1)), var(--bg-color);
    color: var(--heading-font-color);
    text-align: center;
    padding: 4rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.hero p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}


/* === Main Content Layout === */
.main-content {
    padding: 3rem 0;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 992px) {
    .main-grid {
        grid-template-columns: 3fr 1fr;
    }
    .article-grid {
        grid-template-columns: 3fr 1fr;
    }
}

/* === Articles Grid === */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.card-content h3 {
    font-size: 1.25rem;
    min-height: 55px; /* Ensure titles have similar height */
}
.card-content h3 a {
    text-decoration: none;
    color: var(--heading-font-color);
}
.card-content h3 a:hover {
    color: var(--accent-color);
}
.card-content p {
    flex-grow: 1;
    margin-bottom: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: #fff;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 700;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    text-align: center;
}

.btn:hover {
    background-color: var(--accent-color);
    color: #fff;
    transform: translateY(-2px);
    text-decoration: none;
}

/* === Sidebar === */
.sidebar-widget {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.sidebar-widget h3 {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.sidebar-widget ul {
    list-style: none;
    padding-left: 0;
}

.sidebar-widget li {
    margin-bottom: 0.75rem;
}

.sidebar-widget li a::before {
    content: '🌿';
    margin-right: 0.5rem;
    color: var(--primary-color);
}

/* === Article Page === */
.article-full {
    background-color: var(--card-bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.article-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.article-header h1 {
    font-size: 2.8rem;
}
.article-meta {
    color: #6c757d;
    font-style: italic;
}
.article-meta span {
    margin: 0 0.5rem;
}
.article-content {
    font-size: 1.1rem;
}
.article-content h2 {
    margin-top: 2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}
.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.cta-section {
    background-color: var(--bg-color);
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    border-radius: var(--border-radius);
    border: 1px dashed var(--accent-color);
}

blockquote {
    border-left: 4px solid var(--accent-color);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background-color: var(--bg-color);
    font-style: italic;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* === Footer === */
.main-footer {
    background-color: var(--footer-bg-color);
    color: var(--footer-text-color);
    padding: 3rem 0;
    margin-top: 3rem;
}

.footer-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}
.footer-copyright, .footer-links, .footer-back-to-top {
    flex: 1 1 100%;
}
.footer-links a {
    color: var(--footer-text-color);
    margin: 0 0.75rem;
}
.footer-links a:hover {
    color: var(--accent-color);
}

.footer-back-to-top a {
    color: var(--accent-color);
    font-weight: bold;
}

@media (min-width: 768px) {
    .footer-grid {
        text-align: left;
    }
    .footer-copyright {
        flex: 1;
        text-align: left;
    }
     .footer-links {
        flex: 2;
        text-align: center;
    }
    .footer-back-to-top {
        flex: 1;
        text-align: right;
    }
}


/* === Responsive Adjustments === */
@media (max-width: 991px) {
    .main-nav {
        display: none; /* Hide nav by default */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--card-bg-color);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        border-top: 1px solid var(--border-color);
    }
    .main-nav.active {
        display: block;
    }
    .main-nav ul {
        flex-direction: column;
        padding: 1rem;
        gap: 0;
    }
    .main-nav li {
        width: 100%;
    }
    .main-nav a {
        display: block;
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }
     .main-nav li:last-child a {
        border-bottom: none;
    }
    .main-nav a::after {
        display: none;
    }
    .nav-toggle {
        display: block; /* Show hamburger */
    }

    h1 { font-size: 2.2rem; }
    .hero h1 { font-size: 2.5rem; }
}

@media (max-width: 767px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
}