/* ========================================
   GLOBAL STYLES & RESET
======================================== */

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --background-light: #f5f7fa;
    --background-white: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #888888;
    --border-color: #dddddd;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --danger-color: #f44336;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 15px rgba(0, 0, 0, 0.2);
}

/* Dark Mode Variables */
body.dark-mode {
    --background-light: #1a1a1a;
    --background-white: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-light: #999999;
    --border-color: #444444;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background 0.3s ease;
}

body.dark-mode {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   HEADER
======================================== */

.header {
    background-color: var(--background-white);
    padding: 25px 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.header-left h1 {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 3px;
}

.data-note {
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: italic;
}

.header-right {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* ========================================
   BUTTONS
======================================== */

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

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

.btn-icon {
    padding: 10px 15px;
    font-size: 1.2rem;
    background-color: var(--background-light);
    border: 2px solid var(--border-color);
}

.btn-icon:hover {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

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

/* ========================================
   CONTROLS SECTION
======================================== */

.controls {
    background-color: var(--background-white);
    padding: 25px 0;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.search-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

#searchInput {
    flex: 1;
    min-width: 250px;
    padding: 12px 20px;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    font-size: 1rem;
    transition: border-color 0.3s;
    background-color: var(--background-white);
    color: var(--text-primary);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

.filter-sort-container {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-group label {
    font-weight: 600;
    color: var(--text-secondary);
}

select, input[type="number"] {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.95rem;
    background-color: var(--background-white);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.3s;
}

select:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Advanced Filters */
.advanced-filters {
    margin-top: 20px;
    padding: 20px;
    background-color: var(--background-light);
    border-radius: 10px;
    border: 2px solid var(--border-color);
}

.advanced-filters h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.advanced-filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.advanced-filters .filter-group {
    flex-direction: column;
    align-items: stretch;
}

.advanced-filters-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* ========================================
   LOADING & ERROR
======================================== */

.loading {
    text-align: center;
    padding: 50px;
    background-color: var(--background-white);
    border-radius: 10px;
    margin: 20px auto;
    max-width: 400px;
}

.spinner {
    border: 4px solid var(--background-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

.error-message {
    background-color: #fee;
    border: 2px solid #fcc;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    margin: 20px auto;
    max-width: 500px;
}

.error-message p {
    color: var(--danger-color);
    font-size: 1.1rem;
    margin-bottom: 15px;
}

/* ========================================
   RESULTS HEADER
======================================== */

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
    flex-wrap: wrap;
    gap: 10px;
}

.results-count {
    background-color: var(--background-white);
    padding: 12px 20px;
    border-radius: 25px;
    font-weight: 600;
    color: var(--text-secondary);
}

.view-mode {
    display: flex;
    gap: 5px;
}

/* ========================================
   COUNTRIES GRID
======================================== */

.countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
    padding: 20px 0;
}

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

.country-card {
    background-color: var(--background-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
    position: relative;
}

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

.country-card-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 8px;
    z-index: 10;
}

.action-btn {
    width: auto;
    height: 35px;
    padding: 0 12px;
    border-radius: 20px;
    border: none;
    background-color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}

.action-btn:hover {
    transform: scale(1.1);
    background-color: white;
}

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

.country-flag {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.country-info {
    padding: 20px;
}

.country-name {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.country-detail {
    margin: 8px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.country-detail strong {
    color: var(--text-primary);
    font-weight: 600;
}

.country-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.country-badge {
    display: inline-block;
    padding: 4px 10px;
    background-color: #e8f0fe;
    color: #1a73e8;
    border-radius: 12px;
    font-size: 0.85rem;
}

/* ========================================
   MODAL
======================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    overflow-y: auto;
    padding: 20px;
}

.modal-content {
    background-color: var(--background-white);
    border-radius: 15px;
    max-width: 1000px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.compare-modal-content, .stats-modal-content {
    max-width: 1200px;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.3s;
    z-index: 10;
}

.modal-close:hover {
    color: var(--text-primary);
}

.detail-flag {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-md);
}

.detail-header {
    margin-bottom: 30px;
}

.detail-title {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.detail-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    font-style: italic;
}

.detail-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.detail-sections {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.detail-section {
    background-color: var(--background-light);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.section-title {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.detail-item {
    padding: 12px;
    background-color: var(--background-white);
    border-radius: 5px;
    border-left: 3px solid var(--primary-color);
}

.detail-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.detail-item span {
    color: var(--text-primary);
    font-size: 1rem;
}

.detail-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.detail-badge {
    display: inline-block;
    padding: 5px 12px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 15px;
    font-size: 0.9rem;
}

.map-links {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.map-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.map-link:hover {
    background-color: var(--primary-dark);
}

/* Compare Table */
.compare-table {
    width: 100%;
    margin-top: 20px;
    border-collapse: collapse;
}

.compare-table th,
.compare-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.compare-table th {
    background-color: var(--background-light);
    color: var(--primary-color);
    font-weight: 600;
}

.compare-table tr:hover {
    background-color: var(--background-light);
}

/* Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.stat-card {
    background-color: var(--background-light);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.stat-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-bottom: none;
}

/* Quiz */
.quiz-question {
    background-color: var(--background-light);
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.quiz-options {
    display: grid;
    gap: 10px;
    margin-top: 20px;
}

.quiz-option {
    padding: 15px;
    background-color: var(--background-white);
    border: 2px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.quiz-option:hover {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

.quiz-option.correct {
    border-color: var(--success-color);
    background-color: var(--success-color);
    color: white;
}

.quiz-option.incorrect {
    border-color: var(--danger-color);
    background-color: var(--danger-color);
    color: white;
}

.quiz-score {
    text-align: center;
    font-size: 1.5rem;
    margin: 20px 0;
    color: var(--primary-color);
}

/* ========================================
   FOOTER
======================================== */

.footer {
    background-color: var(--background-white);
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
}

.footer p {
    margin: 5px 0;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

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

/* ========================================
   RESPONSIVE DESIGN
======================================== */

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

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

    .header-right {
        justify-content: center;
    }

    .search-container {
        flex-direction: column;
    }

    #searchInput {
        width: 100%;
    }

    .filter-sort-container {
        flex-direction: column;
        align-items: stretch;
    }

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

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

    .modal-content {
        padding: 20px;
    }

    .detail-title {
        font-size: 1.8rem;
    }

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

    .advanced-filters-grid {
        grid-template-columns: 1fr;
    }

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

/* ========================================
   UTILITY CLASSES
======================================== */

.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.p-20 {
    padding: 20px;
}