:root {
    --bg-main: #121214;
    --bg-card: #202024;
    --text-primary: #E1E1E6;
    --text-muted: #A8A8B3;
    --accent-purple: #8257E5;
    --accent-purple-hover: #9466FF;
    --success-green: #04D361;
    --warning-orange: #FBA94C;
    --error-red: #F75A68;
    --border-color: #323238;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 850px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.header-stats {
    display: flex;
    gap: 1.5rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.stat-item svg {
    width: 18px;
    height: 18px;
}

.stat-item span {
    font-weight: 600;
    color: var(--accent-purple);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.share-buttons {
    display: flex;
    gap: 0.5rem;
}

.social-button {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--text-muted);
}

.social-button svg {
    width: 18px;
    height: 18px;
}

.social-button:hover {
    transform: translateY(-2px);
}

.social-button.whatsapp:hover {
    border-color: #25D366;
    color: #25D366;
    background: rgba(37, 211, 102, 0.1);
}

.social-button.twitter:hover {
    border-color: #1DA1F2;
    color: #1DA1F2;
    background: rgba(29, 161, 242, 0.1);
}

.social-button.facebook:hover {
    border-color: #4267B2;
    color: #4267B2;
    background: rgba(66, 103, 178, 0.1);
}

.social-button.telegram:hover {
    border-color: #0088CC;
    color: #0088CC;
    background: rgba(0, 136, 204, 0.1);
}

.social-button.copy:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    background: rgba(130, 87, 229, 0.1);
}

.server-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-card);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.server-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.server-name {
    color: var(--accent-purple);
    font-weight: 600;
    font-size: 0.875rem;
}

.main-display {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.speed-chart {
    width: 100%;
    height: 80px;
    margin-bottom: 1.5rem;
    display: none;
}

.speed-chart.active {
    display: block;
}

.progress-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-main);
    display: none;
}

.progress-container.active {
    display: block;
}

.progress-container.active {
    display: block;
}

.progress-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-purple), var(--success-green));
    width: 100%;
    border-radius: 0 2px 2px 0;
    animation: progressPulse 1.5s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.quality-badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    border-radius: 20px;
    margin-bottom: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
}

.quality-badge.excellent {
    background: rgba(4, 211, 97, 0.15);
    border-color: var(--success-green);
    color: var(--success-green);
}

.quality-badge.good {
    background: rgba(130, 87, 229, 0.15);
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

.quality-badge.fair {
    background: rgba(251, 169, 76, 0.15);
    border-color: var(--warning-orange);
    color: var(--warning-orange);
}

.quality-badge.poor {
    background: rgba(247, 90, 104, 0.15);
    border-color: var(--error-red);
    color: var(--error-red);
}

.speed-display {
    margin-bottom: 1rem;
}

.speed-value {
    font-size: 5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    letter-spacing: -2px;
}

.speed-unit {
    font-size: 1.5rem;
    color: var(--text-muted);
    font-weight: 600;
}

.speed-phase {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    min-height: 1.5rem;
}

.start-button {
    background-color: var(--accent-purple);
    color: white;
    border: none;
    padding: 1rem 3rem;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-family);
}

.start-button:hover:not(:disabled) {
    background-color: var(--accent-purple-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(130, 87, 229, 0.4);
}

.start-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.metrics-grid.secondary {
    margin-bottom: 2rem;
}

.metrics-grid.secondary .metric-card {
    padding: 1rem;
}

.metric-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.metric-card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.metric-card.small {
    padding: 1rem;
}

.metric-card.small .metric-label {
    font-size: 0.7rem;
}

.metric-card.small .metric-value {
    font-size: 1rem;
}

.metric-card.small .metric-unit {
    font-size: 0.7rem;
}

.metric-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 0.75rem;
    color: var(--accent-purple);
}

.metric-icon svg {
    width: 100%;
    height: 100%;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.metric-value.small {
    font-size: 0.9rem;
    word-break: break-all;
}

.metric-unit {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.server-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.info-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.history-section {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.history-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.clear-button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.clear-button:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
}

.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--bg-main);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.history-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
    font-size: 0.875rem;
}

.history-item {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-main);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.history-item:hover {
    border-color: var(--accent-purple);
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.history-ping,
.history-jitter,
.history-download,
.history-upload {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.history-download.high,
.history-upload.high {
    color: var(--success-green);
}

.history-ping.low {
    color: var(--success-green);
}

.history-delete {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.history-delete:hover {
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

.history-delete svg {
    width: 16px;
    height: 16px;
}

.footer {
    text-align: center;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
}

.footer-stats {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-divider {
    color: var(--border-color);
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-stats {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .server-info {
        grid-template-columns: 1fr;
    }

    .speed-value {
        font-size: 3.5rem;
    }

    .history-item {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .history-delete {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }

    .speed-value {
        font-size: 2.5rem;
    }

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

    .metrics-grid.secondary {
        grid-template-columns: 1fr 1fr;
    }
    
    .share-buttons {
        flex-wrap: wrap;
    }
}