/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066cc;
    --secondary-color: #00cc66;
    --accent-color: #0099ff;
    --dark-color: #1a1a1a;
    --light-color: #f8f9fa;
    --gray-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
}

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

/* Navigation */
.navbar {
    background: white;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

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

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #0052a3;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.link-card {
    display: block;
    text-decoration: none;
    color: inherit;
}

.link-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Specific Component Styles */
.rules-grid,
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.rule-card,
.link-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.rule-card:hover,
.link-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.rule-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

/* Quiz Styles */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.progress-bar {
    height: 6px;
    background-color: #e9ecef;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.5s ease;
}

.quiz-question {
    padding: 3rem;
}

.question-counter {
    text-align: center;
    color: var(--gray-color);
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.question-content h2 {
    margin-bottom: 2rem;
    color: var(--dark-color);
}

.answers {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.answer-option {
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.answer-option:hover {
    border-color: var(--primary-color);
    background-color: #f8f9ff;
}

.answer-option.selected {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

.quiz-results {
    text-align: center;
    padding: 3rem;
}

.score-display {
    font-size: 4rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 2rem 0;
}

.score-message {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--gray-color);
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Scenario Styles */
.scenarios-container {
    display: grid;
    gap: 3rem;
    margin-top: 2rem;
}

.scenario-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
}

.scenario-card h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
}

.situation {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
}

.situation h4 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

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

.do,
.dont {
    padding: 1.5rem;
    border-radius: var(--border-radius);
}

.do {
    background-color: #d4edda;
    border-left: 4px solid var(--success-color);
}

.dont {
    background-color: #f8d7da;
    border-left: 4px solid var(--danger-color);
}

.do h4,
.dont h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.do ul,
.dont ul {
    list-style: none;
    padding-left: 0;
}

.do li,
.dont li {
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
}

.do li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.dont li::before {
    content: "✗";
    position: absolute;
    left: 0;
    color: var(--danger-color);
    font-weight: bold;
}

/* Compatibility Checker */
.compatibility-checker {
    background: white;
    margin: 2rem 0;
    padding: 2rem 0;
}

.checker-form {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group select,
.form-group input {
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.compatibility-results {
    max-width: 800px;
    margin: 2rem auto 0;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Network Status */
.network-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.network-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.network-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.compatibility-status {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.status-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-badge.compatible {
    background-color: var(--success-color);
    color: white;
}

.status-badge.partial {
    background-color: var(--warning-color);
    color: var(--dark-color);
}

.status-badge.tesla {
    background-color: #cc0000;
    color: white;
}

/* Timeline */
.timeline {
    position: relative;
    margin: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-date {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    font-weight: bold;
    min-width: 80px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    flex: 1;
    margin: 0 2rem;
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Statistics Dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.stat-card {
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    color: var(--gray-color);
    margin-top: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .do-dont {
        grid-template-columns: 1fr;
    }

    .checker-form {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 30px;
    }

    .timeline-item {
        flex-direction: row !important;
        padding-left: 60px;
    }

    .timeline-date {
        position: absolute;
        left: 0;
        min-width: 60px;
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .timeline-content {
        margin: 0 0 0 1rem;
    }

    .results-actions {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-section {
        padding: 2rem 0;
    }

    .card,
    .rule-card,
    .scenario-card {
        padding: 1.5rem;
    }

    .quiz-question {
        padding: 2rem;
    }
}

/* Source Popup Styles */
[data-source="true"] {
    position: relative !important;
    cursor: help;
}

.source-popup {
    position: absolute;
    top: -10px;
    right: -10px;
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    pointer-events: none;
}

[data-source="true"]:hover .source-popup {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    pointer-events: auto !important;
}

.source-content {
    background: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border: 1px solid #e0e0e0;
    min-width: 280px;
    max-width: 350px;
    position: relative;
}

.source-content::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 20px;
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid white;
}

.source-content h4 {
    margin: 0 0 0.5rem 0;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.source-content p {
    margin: 0 0 0.5rem 0;
    font-size: 0.8rem;
    line-height: 1.4;
}

.source-content p:first-of-type {
    font-weight: 600;
    color: var(--dark-color);
}

.source-content p:last-of-type {
    margin-bottom: 0.75rem;
    color: var(--gray-color);
}

.source-content a {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    background: rgba(0, 102, 204, 0.1);
    transition: var(--transition);
}

.source-content a:hover {
    background: var(--primary-color);
    color: white;
}

/* Stat card specific positioning */
.stat-card .source-popup {
    top: -20px;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    right: auto;
}

.stat-card:hover .source-popup {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateX(-50%) translateY(-20px) !important;
    pointer-events: auto !important;
}

.stat-card {
    position: relative;
}

/* Link card specific positioning */
.link-card .source-popup {
    top: 10px;
    right: 10px;
}

/* Card hover effects for source indication */
[data-source="true"]::after {
    content: 'ℹ️';
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 0.8rem;
    opacity: 0.6;
    transition: var(--transition);
}

[data-source="true"]:hover::after {
    opacity: 1;
    transform: scale(1.1);
}

/* Responsive adjustments for popups */
@media (max-width: 768px) {
    .source-popup {
        position: fixed;
        top: 50% !important;
        left: 50% !important;
        right: auto !important;
        transform: translate(-50%, -50%) !important;
        z-index: 1060;
    }

    [data-source="true"]:hover .source-popup {
        transform: translate(-50%, -50%) !important;
    }

    .source-content {
        min-width: 280px;
        max-width: 90vw;
    }

    .source-content::before {
        display: none;
    }

    /* Add overlay for mobile */
    [data-source="true"]:hover::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.3);
        z-index: 1059;
    }
}