/* ============================================
   EU ELECTRICITY PRODUCTION - SHARED STYLES
   Professional EU Blue theme, mobile-responsive
   ============================================ */

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #1a202c;
    background-color: #f7fafc;
}

/* === NAVIGATION BAR === */
.navbar {
    background: #ffffff;
    border-bottom: 2px solid #e2e8f0;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a202c;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background-color: rgba(0, 102, 204, 0.1);
    color: #003399;
}

.nav-links a.active {
    background: linear-gradient(135deg, #003399 0%, #0066CC 100%);
    color: white;
}

/* === CONTAINER === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* === PAGE HEADER === */
/* === HERO SECTION === */
.page-header {
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: linear-gradient(135deg, #003399 0%, #6B9FD8 100%);
    color: white;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: white;
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
    font-weight: 400;
    color: white;
}

/* === INFO BOX === */
.info-box {
    background: linear-gradient(135deg, rgba(0, 51, 153, 0.05) 0%, rgba(0, 102, 204, 0.05) 100%);
    border-left: 4px solid #0066CC;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.info-box p {
    margin: 0.3rem 0;
    color: #2d3748;
}

.info-box strong {
    color: #003399;
}

.info-box a {
    color: #0066CC;
    text-decoration: none;
    font-weight: 500;
}

.info-box a:hover {
    text-decoration: underline;
}

/* === NAVIGATION GRID (Home page) === */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.nav-card {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    border: 1px solid #cbd5e0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.nav-card:hover {
    border-color: #0066CC;
    box-shadow: 0 8px 16px rgba(0, 102, 204, 0.15);
    transform: translateY(-2px);
}

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

.nav-card h2 {
    color: #1a202c;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.nav-card p {
    color: #4a5568;
    margin-bottom: 1rem;
}

.update-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(0, 51, 153, 0.1) 0%, rgba(0, 102, 204, 0.1) 100%);
    color: #003399;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* === FEATURE CHART (Home page) === */
.feature-chart {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    margin: 3rem 0;
    border: 1px solid #cbd5e0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.feature-chart h2 {
    color: #1a202c;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* === CHART SECTIONS === */
.chart-section {
    margin: 2rem 0;
}

.chart-container {
    background-color: white;
    border-radius: 8px;
    padding: 0.5rem;
    margin-bottom: 3rem;
    border: 1px solid #cbd5e0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.chart-container h2,
.chart-container h3 {
    color: #1a202c;
    margin-bottom: 1rem;
}

.chart-img {
    width: 100%;
    height: auto;
    display: block;
    margin: 0;
    border-radius: 4px;
}

.chart-caption {
    color: #4a5568;
    font-size: 0.95rem;
    font-style: italic;
    margin-top: 1rem;
    text-align: center;
}

/* === TRENDS PAGE SECTIONS === */
.trends-section {
    margin: 3rem 0;
}

.section-title {
    color: #1a202c;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid #0066CC;
}

.section-description {
    color: #4a5568;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* === CHART SELECTOR (Dropdown) === */
.chart-selector {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    border: 2px solid #0066CC;
    box-shadow: 0 4px 8px rgba(0, 102, 204, 0.1);
}

.chart-selector label {
    display: block;
    font-size: 1.2rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 1rem;
}

.chart-selector select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.chart-selector select:hover {
    border-color: #0066CC;
}

.chart-selector select:focus {
    outline: none;
    border-color: #003399;
    box-shadow: 0 0 0 3px rgba(0, 51, 153, 0.1);
}

.chart-selector optgroup {
    font-weight: 600;
    color: #1a202c;
    font-style: normal;
}

.chart-selector option {
    padding: 0.5rem;
}

/* === INSIGHTS BOX === */
.insights-box,
.technical-note {
    background: linear-gradient(135deg, rgba(0, 51, 153, 0.03) 0%, rgba(0, 102, 204, 0.03) 100%);
    border-left: 4px solid #0066CC;
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 8px;
}

.insights-box h3,
.technical-note h3 {
    color: #003399;
    margin-bottom: 1rem;
}

.insights-box ul,
.technical-note ul {
    margin-left: 1.5rem;
    color: #2d3748;
}

.insights-box li,
.technical-note li {
    margin: 0.5rem 0;
}

/* === FOOTER === */
footer {
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 1rem;
}

footer a {
    color: #63b3ed;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
    color: #90cdf4;
}

/* === MOBILE RESPONSIVE === */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 0 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .nav-title {
        font-size: 1.2rem;
    }
    
    /* EU Flag responsive sizing */
    .nav-title svg {
        width: 28px;
        height: 19px;
        margin-right: 8px;
    }

    .container {
        padding: 1rem;
    }

    .page-header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .nav-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .nav-card {
        padding: 1.5rem;
    }

    .card-icon {
        font-size: 2.5rem;
    }

    .chart-container {
        padding:2px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .info-box,
    .insights-box,
    .technical-note {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .nav-links a {
        padding: 0.3rem 0.6rem;
        font-size: 0.85rem;
    }
    
    /* EU Flag responsive sizing */
    .nav-title svg {
        width: 24px;
        height: 16px;
        margin-right: 6px;
    }

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