.mode-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1rem;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.mode-tab {
    flex: 1;
    padding: 0.65rem 1rem;
    border: none;
    background: var(--color-bg-secondary);
    color: var(--color-text);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-tab:not(:last-child) {
    border-right: 1px solid var(--color-border);
}

.mode-tab:hover {
    background: var(--color-bg-tertiary);
}

.mode-tab.active {
    background: var(--color-primary);
    color: white;
}

.mode-content {
    margin-bottom: 1rem;
}

.mode-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0 0 0.75rem;
}

#url-row {
    display: flex;
}

.url-input {
    width: 100%;
    padding: 0.65rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--color-bg-secondary);
    color: var(--color-text);
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.url-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

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

.controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

#summary {
    margin: 1rem 0 0;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    min-height: 1.4em;
    font-weight: 500;
}

#speed-result-card {
    display: none;
}

#speed-result-card.visible {
    display: block;
}

#ping-log {
    margin-top: 1rem;
    max-height: 360px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

#ping-log:empty {
    display: none;
}

.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin: 0 0 0.25rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
    line-height: 1;
}

.stat-unit {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.ping-row {
    display: grid;
    grid-template-columns: 3rem 4.5rem 1fr 1.5rem;
    align-items: center;
    padding: 0.45rem 0.75rem;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-border);
    gap: 0.5rem;
}

.ping-row:last-child {
    border-bottom: none;
}

.ping-ok {
    background: #fff;
}

.ping-drop {
    background: #fff5f5;
}

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

.ping-ms {
    color: var(--color-text);
}

.ping-dot {
    text-align: right;
    font-size: 0.85rem;
}

.ping-ok .ping-dot {
    color: #16a34a;
}

.ping-drop .ping-dot {
    color: #dc2626;
}

.ping-speed {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.section-separator {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: 1.5rem 0 2rem;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
}

.faq-item + .faq-item {
    margin-top: 0.75rem;
}

@media (max-width: 480px) {
    .ping-row {
        grid-template-columns: 2.5rem 4rem 1fr 1.2rem;
        padding: 0.4rem 0.6rem;
    }
}