h1 {
    text-align: center;
}

.rd-techniques {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
    margin-top: 10px;
}

.rd-technique-card {
    background: var(--bg-card);
    border: 1px solid rgba(51, 153, 255, 0.2);
    border-radius: 14px;
    padding: 20px 22px;
    transition: border-color 0.2s;
}

.rd-technique-card:hover {
    border-color: rgba(51, 153, 255, 0.45);
}

.rd-technique-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.rd-technique-card h4 {
    margin: 0 0 8px;
    font-size: 0.97rem;
    background: linear-gradient(135deg, #3399ff, #66d9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.rd-technique-card p {
    margin: 0;
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.55;
}

/* Demo */
.rd-demo-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 16px;
}

@media (max-width: 768px) {
    .rd-demo-layout {
        grid-template-columns: 1fr;
    }
}

.rd-usb-panel {
    background: var(--bg-card);
    border: 1px solid rgba(51, 153, 255, 0.15);
    border-radius: 14px;
    padding: 20px;
}

.rd-usb-panel h4 {
    margin: 0 0 14px;
    font-size: 0.95rem;
    background: linear-gradient(135deg, #3399ff, #66d9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.rd-usb-visual {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 10px;
    margin-bottom: 14px;
}

.rd-usb-icon {
    font-size: 2.2rem;
    flex-shrink: 0;
}

.rd-usb-status {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

.rd-usb-status strong {
    display: block;
    color: #fff;
    margin-bottom: 2px;
}

.rd-usb-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-top: 6px;
}

.rd-usb-badge.idle {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

.rd-usb-badge.active {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    animation: rd-pulse 1s ease-in-out infinite;
}

.rd-usb-badge.done {
    background: rgba(34, 197, 94, 0.2);
    color: #86efac;
}

@keyframes rd-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.rd-plug-btn {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: none;
    background: linear-gradient(135deg, #3399ff, #66d9ff);
    color: #0f172a;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

.rd-plug-btn:hover:not(:disabled) {
    opacity: 0.88;
}

.rd-plug-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Terminal */
.rd-terminal {
    background: #0d1117;
    border: 1px solid rgba(51, 153, 255, 0.2);
    border-radius: 14px;
    padding: 0;
    overflow: hidden;
    font-family: 'Courier New', monospace;
}

.rd-terminal-bar {
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.rd-terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.rd-terminal-dot:nth-child(1) { background: #ef4444; }
.rd-terminal-dot:nth-child(2) { background: #f59e0b; }
.rd-terminal-dot:nth-child(3) { background: #22c55e; }

.rd-terminal-title {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.4);
    margin-left: 4px;
}

.rd-terminal-body {
    padding: 14px 16px;
    min-height: 200px;
    max-height: 280px;
    overflow-y: auto;
    font-size: 0.82rem;
    line-height: 1.7;
}

.rd-terminal-body::-webkit-scrollbar { width: 4px; }
.rd-terminal-body::-webkit-scrollbar-track { background: transparent; }
.rd-terminal-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.rd-line-prompt { color: #3399ff; }
.rd-line-cmd { color: #e2e8f0; }
.rd-line-output { color: rgba(255, 255, 255, 0.45); }
.rd-line-danger { color: #f87171; }
.rd-line-success { color: #86efac; }
.rd-cursor {
    display: inline-block;
    width: 8px;
    height: 14px;
    background: #3399ff;
    vertical-align: middle;
    animation: rd-blink 0.8s step-end infinite;
}

@keyframes rd-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.rd-result-banner {
    display: none;
    margin-top: 14px;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.88rem;
    font-weight: 600;
}

.rd-result-banner.danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: #f87171;
}

.rd-result-banner.safe {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #86efac;
}

.rd-demo-btns {
    margin-top: 16px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}