/* Global Styles */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 0;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.main-site-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    background-color: rgba(255, 255, 255, 0.15);
    transition: all 0.2s;
    white-space: nowrap;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.main-site-link:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    font-weight: 300;
}

.nav {
    display: flex;
    gap: 2rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: background-color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 3rem auto;
    max-width: 800px;
}

.stat-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Features Section */
.features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* About Section */
.about {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--radius);
    margin: 3rem 0;
    box-shadow: var(--shadow-md);
}

.about h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.about h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

.about-text p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.about-text ul {
    list-style: none;
    padding-left: 0;
}

.about-text li {
    padding: 0.5rem 0;
    color: var(--text-muted);
}

.about-text strong {
    color: var(--text-color);
}

.about-text pre {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1rem 0;
}

.about-text code {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}

.footer-content p {
    color: var(--text-muted);
    margin: 0.5rem 0;
}

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

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

.footer-note {
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* Search & Filter */
.search-section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.search-filter-wrapper {
    display: flex;
    gap: 1.5rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.search-group {
    flex: 1;
    min-width: 300px;
}

.search-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.2s;
    background-color: white;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.filter-group label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-select {
    padding: 0.875rem 2.5rem 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232563eb' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 12px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.filter-select:hover {
    border-color: var(--primary-color);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Cards & Lists */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-add {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.badge-update {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-delete {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* Loading & Empty States */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Changelogs List */
.changelogs-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.changelog-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.changelog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.changelog-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.changelog-card .card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.country-total {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.entity-stat {
    font-size: 0.875rem;
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    background: var(--bg-color);
    border-radius: 4px;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    display: inline-block;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-content h1 {
        font-size: 1.5rem;
    }

    .main-site-link {
        width: 100%;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 1.75rem;
    }

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

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .nav {
        gap: 1rem;
    }

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

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .changelogs-list {
        grid-template-columns: 1fr;
    }

    .search-filter-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .search-group,
    .filter-group {
        min-width: 100%;
    }
}