.demo-screen {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 1500;
    justify-content: center;
    align-items: center;
}

.demo-screen.active {
    display: flex;
    visibility: visible;
    opacity: 1;
}

.demo-screen-box {
    background: #1f1f1f;
    color: #f2f2f2;
    padding: 32px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    text-align: center;
    min-width: 280px;
    border: 1px solid #333;
}

body.light-theme .demo-screen-box {
    background: #ffffff;
    color: #1f2937;
    border-color: #d4d9e2;
}

.demo-screen-title {
    margin-bottom: 24px;
    font-size: 20px;
    font-weight: 600;
}

.demo-screen-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.demo-btn {
    padding: 14px 24px;
    font-size: 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.demo-btn-create {
    background: #5b8def;
    color: #fff;
}

.demo-btn-create:hover {
    background: #4a7ad4;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(91, 141, 239, 0.35);
}

body.light-theme .demo-btn-create {
    background: #4f7cff;
}

body.light-theme .demo-btn-create:hover {
    background: #3d6ae6;
}

.demo-btn-clear {
    background: #333;
    color: #e8e8e8;
}

.demo-btn-clear:hover {
    background: #444;
}

body.light-theme .demo-btn-clear {
    background: #e2e8f0;
    color: #334155;
}

body.light-theme .demo-btn-clear:hover {
    background: #cbd5e1;
}

.demo-btn-back {
    background: transparent;
    color: #94a3b8;
    border: 1px solid #475569;
}

.demo-btn-back:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #e2e8f0;
}

body.light-theme .demo-btn-back {
    color: #64748b;
    border-color: #cbd5e1;
}

body.light-theme .demo-btn-back:hover {
    background: rgba(0, 0, 0, 0.04);
    color: #475569;
}