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

:root {
    --primary: #4285f4;
    --success: #0f9d58;
    --warning: #f4b400;
    --error: #db4437;
    --info: #4285f4;
    --google-play: #01875f;
    --app-store: #007aff;
    --bg-main: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border: #dadce0;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
header {
    text-align: center;
    padding: 40px 20px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Store Toggle */
.store-toggle {
    margin-bottom: 24px;
}

.store-toggle-label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.store-toggle-buttons {
    display: flex;
    gap: 12px;
}

.store-button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 20px;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--bg-card);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.store-button:hover {
    border-color: var(--text-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.store-button.active[data-store="google-play"] {
    border-color: var(--google-play);
    background: rgba(1, 135, 95, 0.1);
}

.store-button.active[data-store="app-store"] {
    border-color: var(--app-store);
    background: rgba(0, 122, 255, 0.1);
}

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

.store-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* Input Section */
.input-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: #3367d6;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    background: #dadce0;
    cursor: not-allowed;
    transform: none;
}

/* Loading Section */
.loading-section {
    text-align: center;
    padding: 60px 20px;
}

.loader {
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loading-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.loading-progress {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

/* Result Store Badge */
.result-store-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 20px;
}

.result-store-badge.google-play {
    background: rgba(1, 135, 95, 0.15);
    color: var(--google-play);
}

.result-store-badge.app-store {
    background: rgba(0, 122, 255, 0.15);
    color: var(--app-store);
}

.store-badge-icon {
    font-size: 1.2rem;
}

.store-badge-name {
    font-size: 0.95rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    border-left: 4px solid;
}

.stat-card.stat-success {
    border-left-color: var(--success);
}

.stat-card.stat-warning {
    border-left-color: var(--warning);
}

.stat-card.stat-error {
    border-left-color: var(--error);
}

.stat-card.stat-info {
    border-left-color: var(--info);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-success .stat-value {
    color: var(--success);
}

.stat-warning .stat-value {
    color: var(--warning);
}

.stat-error .stat-value {
    color: var(--error);
}

.stat-info .stat-value {
    color: var(--info);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border);
    overflow-x: auto;
}

.tab-button {
    padding: 12px 24px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.tab-button:hover {
    color: var(--primary);
    background: rgba(66, 133, 244, 0.05);
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Tab Content */
.tab-content {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Country List */
.country-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 12px;
}

.country-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-main);
    transition: all 0.2s;
}

.country-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.country-name {
    font-weight: 500;
    color: var(--text-primary);
}

.country-code {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-left: 8px;
}

.country-version {
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.version-match {
    background: #e6f4ea;
    color: var(--success);
}

.version-mismatch {
    background: #fef7e0;
    color: var(--warning);
}

.version-unavailable {
    background: #fce8e6;
    color: var(--error);
}

/* Error Section */
.error-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
}

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

.error-message h3 {
    color: var(--error);
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.error-message p {
    color: var(--text-secondary);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .store-toggle-buttons {
        flex-direction: column;
    }

    .store-button {
        justify-content: flex-start;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .tabs {
        flex-wrap: nowrap;
    }

    .tab-button {
        font-size: 0.9rem;
        padding: 10px 16px;
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}